-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
+/*
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Copyright (c) 2011, 2014, Intel Corporation.
*
- * Copyright (C) 2001, 2002 Cluster File Systems, Inc.
* Author: Zach Brown <zab@zabbo.net>
* Author: Peter J. Braam <braam@clusterfs.com>
* Author: Phil Schwan <phil@clusterfs.com>
* Author: Eric Barton <eric@bartonsoftware.com>
*
- * This file is part of Portals, http://www.sf.net/projects/sandiaportals/
+ * This file is part of Lustre, https://wiki.hpdd.intel.com/
*
* Portals is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-#include "socknal.h"
-
-atomic_t ksocknal_packets_received;
-atomic_t ksocknal_packets_launched;
-atomic_t ksocknal_packets_being_sent;
-
-#if SOCKNAL_ZC
-int ksocknal_do_zc = 1;
-int ksocknal_zc_min_frag = 2048;
-#endif
+#include "socklnd.h"
-/*
- * LIB functions follow
- *
- */
-int
-ksocknal_read(nal_cb_t *nal, void *private, void *dst_addr,
- user_ptr src_addr, size_t len)
+ksock_tx_t *
+ksocknal_alloc_tx(int type, int size)
{
- CDEBUG(D_NET, LPX64": reading %ld bytes from %p -> %p\n",
- nal->ni.nid, (long)len, src_addr, dst_addr);
-
- memcpy( dst_addr, src_addr, len );
- return 0;
-}
+ ksock_tx_t *tx = NULL;
-int
-ksocknal_write(nal_cb_t *nal, void *private, user_ptr dst_addr,
- void *src_addr, size_t len)
-{
- CDEBUG(D_NET, LPX64": writing %ld bytes from %p -> %p\n",
- nal->ni.nid, (long)len, src_addr, dst_addr);
+ if (type == KSOCK_MSG_NOOP) {
+ LASSERT(size == KSOCK_NOOP_TX_SIZE);
- memcpy( dst_addr, src_addr, len );
- return 0;
-}
+ /* searching for a noop tx in free list */
+ spin_lock(&ksocknal_data.ksnd_tx_lock);
-int
-ksocknal_callback (nal_cb_t * nal, void *private, lib_eq_t *eq,
- ptl_event_t *ev)
-{
- CDEBUG(D_NET, LPX64": callback eq %p ev %p\n",
- nal->ni.nid, eq, ev);
+ if (!list_empty(&ksocknal_data.ksnd_idle_noop_txs)) {
+ tx = list_entry(ksocknal_data.ksnd_idle_noop_txs. \
+ next, ksock_tx_t, tx_list);
+ LASSERT(tx->tx_desc_size == size);
+ list_del(&tx->tx_list);
+ }
- if (eq->event_callback != NULL)
- eq->event_callback(ev);
+ spin_unlock(&ksocknal_data.ksnd_tx_lock);
+ }
- return 0;
-}
+ if (tx == NULL)
+ LIBCFS_ALLOC(tx, size);
-void *
-ksocknal_malloc(nal_cb_t *nal, size_t len)
-{
- void *buf;
+ if (tx == NULL)
+ return NULL;
- PORTAL_ALLOC(buf, len);
+ atomic_set(&tx->tx_refcount, 1);
+ tx->tx_zc_aborted = 0;
+ tx->tx_zc_capable = 0;
+ tx->tx_zc_checked = 0;
+ tx->tx_desc_size = size;
- if (buf != NULL)
- memset(buf, 0, len);
+ atomic_inc(&ksocknal_data.ksnd_nactive_txs);
- return (buf);
+ return tx;
}
-void
-ksocknal_free(nal_cb_t *nal, void *buf, size_t len)
+ksock_tx_t *
+ksocknal_alloc_tx_noop(__u64 cookie, int nonblk)
{
- PORTAL_FREE(buf, len);
-}
+ ksock_tx_t *tx;
-void
-ksocknal_printf(nal_cb_t *nal, const char *fmt, ...)
-{
- va_list ap;
- char msg[256];
+ tx = ksocknal_alloc_tx(KSOCK_MSG_NOOP, KSOCK_NOOP_TX_SIZE);
+ if (tx == NULL) {
+ CERROR("Can't allocate noop tx desc\n");
+ return NULL;
+ }
- va_start (ap, fmt);
- vsnprintf (msg, sizeof (msg), fmt, ap); /* sprint safely */
- va_end (ap);
+ tx->tx_conn = NULL;
+ tx->tx_lnetmsg = NULL;
+ tx->tx_kiov = NULL;
+ tx->tx_nkiov = 0;
+ tx->tx_iov = tx->tx_frags.virt.iov;
+ tx->tx_niov = 1;
+ tx->tx_nonblk = nonblk;
- msg[sizeof (msg) - 1] = 0; /* ensure terminated */
+ tx->tx_msg.ksm_csum = 0;
+ tx->tx_msg.ksm_type = KSOCK_MSG_NOOP;
+ tx->tx_msg.ksm_zc_cookies[0] = 0;
+ tx->tx_msg.ksm_zc_cookies[1] = cookie;
- CDEBUG (D_NET, "%s", msg);
+ return tx;
}
-void
-ksocknal_cli(nal_cb_t *nal, unsigned long *flags)
-{
- ksock_nal_data_t *data = nal->nal_data;
-
- spin_lock(&data->ksnd_nal_cb_lock);
-}
void
-ksocknal_sti(nal_cb_t *nal, unsigned long *flags)
+ksocknal_free_tx (ksock_tx_t *tx)
{
- ksock_nal_data_t *data;
- data = nal->nal_data;
+ atomic_dec(&ksocknal_data.ksnd_nactive_txs);
- spin_unlock(&data->ksnd_nal_cb_lock);
-}
+ if (tx->tx_lnetmsg == NULL && tx->tx_desc_size == KSOCK_NOOP_TX_SIZE) {
+ /* it's a noop tx */
+ spin_lock(&ksocknal_data.ksnd_tx_lock);
-int
-ksocknal_dist(nal_cb_t *nal, ptl_nid_t nid, unsigned long *dist)
-{
- /* I would guess that if ksocknal_get_conn(nid) == NULL,
- and we're not routing, then 'nid' is very distant :) */
- if ( nal->ni.nid == nid ) {
- *dist = 0;
- } else {
- *dist = 1;
- }
+ list_add(&tx->tx_list, &ksocknal_data.ksnd_idle_noop_txs);
- return 0;
+ spin_unlock(&ksocknal_data.ksnd_tx_lock);
+ } else {
+ LIBCFS_FREE(tx, tx->tx_desc_size);
+ }
}
-ksock_ltx_t *
-ksocknal_get_ltx (int may_block)
+static int
+ksocknal_send_iov (ksock_conn_t *conn, ksock_tx_t *tx)
{
- long flags;
- ksock_ltx_t *ltx = NULL;
+ struct kvec *iov = tx->tx_iov;
+ int nob;
+ int rc;
- for (;;) {
- spin_lock_irqsave (&ksocknal_data.ksnd_idle_ltx_lock, flags);
+ LASSERT (tx->tx_niov > 0);
- if (!list_empty (&ksocknal_data.ksnd_idle_ltx_list)) {
- ltx = list_entry(ksocknal_data.ksnd_idle_ltx_list.next,
- ksock_ltx_t, ltx_tx.tx_list);
- list_del (<x->ltx_tx.tx_list);
- break;
- }
+ /* Never touch tx->tx_iov inside ksocknal_lib_send_iov() */
+ rc = ksocknal_lib_send_iov(conn, tx);
- if (!may_block) {
- if (!list_empty(&ksocknal_data.ksnd_idle_nblk_ltx_list)) {
- ltx = list_entry(ksocknal_data.ksnd_idle_nblk_ltx_list.next,
- ksock_ltx_t, ltx_tx.tx_list);
- list_del (<x->ltx_tx.tx_list);
- }
- break;
- }
+ if (rc <= 0) /* sent nothing? */
+ return (rc);
- spin_unlock_irqrestore(&ksocknal_data.ksnd_idle_ltx_lock,
- flags);
+ nob = rc;
+ LASSERT (nob <= tx->tx_resid);
+ tx->tx_resid -= nob;
- wait_event (ksocknal_data.ksnd_idle_ltx_waitq,
- !list_empty (&ksocknal_data.ksnd_idle_ltx_list));
- }
+ /* "consume" iov */
+ do {
+ LASSERT (tx->tx_niov > 0);
+
+ if (nob < (int) iov->iov_len) {
+ iov->iov_base += nob;
+ iov->iov_len -= nob;
+ return (rc);
+ }
- spin_unlock_irqrestore (&ksocknal_data.ksnd_idle_ltx_lock, flags);
+ nob -= iov->iov_len;
+ tx->tx_iov = ++iov;
+ tx->tx_niov--;
+ } while (nob != 0);
- return (ltx);
+ return (rc);
}
-#if SOCKNAL_ZC
-struct page *
-ksocknal_kvaddr_to_page (unsigned long vaddr)
+static int
+ksocknal_send_kiov (ksock_conn_t *conn, ksock_tx_t *tx)
{
- struct page *page;
-
- if (vaddr >= VMALLOC_START &&
- vaddr < VMALLOC_END)
- page = vmalloc_to_page ((void *)vaddr);
-#if CONFIG_HIGHMEM
- else if (vaddr >= PKMAP_BASE &&
- vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE))
- page = vmalloc_to_page ((void *)vaddr);
- /* in 2.4 ^ just walks the page tables */
-#endif
- else
- page = virt_to_page (vaddr);
+ lnet_kiov_t *kiov = tx->tx_kiov;
+ int nob;
+ int rc;
- if (page == NULL ||
- !VALID_PAGE (page))
- return (NULL);
+ LASSERT (tx->tx_niov == 0);
+ LASSERT (tx->tx_nkiov > 0);
- return (page);
-}
-#endif
+ /* Never touch tx->tx_kiov inside ksocknal_lib_send_kiov() */
+ rc = ksocknal_lib_send_kiov(conn, tx);
-int
-ksocknal_send_iov (struct socket *sock, ksock_tx_t *tx, int more)
-{
- struct iovec *iov = tx->tx_iov;
- int fragsize = iov->iov_len;
- unsigned long vaddr = (unsigned long)iov->iov_base;
-#if SOCKNAL_ZC
- int offset = vaddr & (PAGE_SIZE - 1);
- int zcsize = MIN (fragsize, PAGE_SIZE - offset);
- struct page *page;
-#endif
- int rc;
+ if (rc <= 0) /* sent nothing? */
+ return (rc);
- /* NB we can't trust socket ops to either consume our iovs
- * or leave them alone, so we only send 1 frag at a time. */
- LASSERT (fragsize <= tx->tx_nob);
- LASSERT (tx->tx_niov > 0);
- more |= (tx->tx_niov > 1);
-
-#if SOCKNAL_ZC
- if (ksocknal_do_zc &&
- (sock->sk->route_caps & NETIF_F_SG) &&
- (sock->sk->route_caps & (NETIF_F_IP_CSUM | NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)) &&
- zcsize >= ksocknal_zc_min_frag &&
- (page = ksocknal_kvaddr_to_page (vaddr)) != NULL) {
-
- CDEBUG(D_NET, "vaddr %p, page %p->%p + offset %x for %d\n",
- (void *)vaddr, page, page_address(page), offset, zcsize);
-
- more |= (zcsize < fragsize);
-
- rc = tcp_sendpage_zccd(sock, page, offset, zcsize,
- more ? (MSG_DONTWAIT | MSG_MORE) : MSG_DONTWAIT,
- &tx->tx_zccd);
- } else
-#endif
- {
- /* NB don't pass tx's iov; sendmsg may or may not update it */
- struct iovec fragiov = { .iov_base = (void *)vaddr,
- .iov_len = fragsize};
- struct msghdr msg = {
- .msg_name = NULL,
- .msg_namelen = 0,
- .msg_iov = &fragiov,
- .msg_iovlen = 1,
- .msg_control = NULL,
- .msg_controllen = 0,
- .msg_flags = more ? (MSG_DONTWAIT | MSG_MORE) : MSG_DONTWAIT
- };
- mm_segment_t oldmm = get_fs();
-
- set_fs (KERNEL_DS);
- rc = sock->sk->prot->sendmsg(sock->sk, &msg, fragsize);
- set_fs (oldmm);
- }
+ nob = rc;
+ LASSERT (nob <= tx->tx_resid);
+ tx->tx_resid -= nob;
- if (rc <= 0)
- return (rc);
+ /* "consume" kiov */
+ do {
+ LASSERT(tx->tx_nkiov > 0);
- tx->tx_nob -= rc;
+ if (nob < (int)kiov->kiov_len) {
+ kiov->kiov_offset += nob;
+ kiov->kiov_len -= nob;
+ return rc;
+ }
- if (rc < fragsize) {
- /* didn't send whole frag */
- iov->iov_base = (void *)(vaddr + rc);
- iov->iov_len = fragsize - rc;
- return (-EAGAIN);
- }
+ nob -= (int)kiov->kiov_len;
+ tx->tx_kiov = ++kiov;
+ tx->tx_nkiov--;
+ } while (nob != 0);
- /* everything went */
- LASSERT (rc == fragsize);
- tx->tx_iov++;
- tx->tx_niov--;
- return (1);
+ return (rc);
}
-int
-ksocknal_send_kiov (struct socket *sock, ksock_tx_t *tx, int more)
+static int
+ksocknal_transmit(ksock_conn_t *conn, ksock_tx_t *tx)
{
- ptl_kiov_t *kiov = tx->tx_kiov;
- int fragsize = kiov->kiov_len;
- struct page *page = kiov->kiov_page;
- int offset = kiov->kiov_offset;
- int rc;
-
- /* NB we can't trust socket ops to either consume our iovs
- * or leave them alone, so we only send 1 frag at a time. */
- LASSERT (fragsize <= tx->tx_nob);
- LASSERT (offset + fragsize <= PAGE_SIZE);
- LASSERT (tx->tx_nkiov > 0);
- more |= (tx->tx_nkiov > 1);
+ int rc;
+ int bufnob;
-#if SOCKNAL_ZC
- if (ksocknal_do_zc &&
- (sock->sk->route_caps & NETIF_F_SG) &&
- (sock->sk->route_caps & (NETIF_F_IP_CSUM | NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)) &&
- fragsize >= ksocknal_zc_min_frag) {
+ if (ksocknal_data.ksnd_stall_tx != 0) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(cfs_time_seconds(ksocknal_data.ksnd_stall_tx));
+ }
- CDEBUG(D_NET, "page %p + offset %x for %d\n",
- page, offset, fragsize);
+ LASSERT(tx->tx_resid != 0);
- rc = tcp_sendpage_zccd(sock, page, offset, fragsize,
- more ? (MSG_DONTWAIT | MSG_MORE) : MSG_DONTWAIT,
- &tx->tx_zccd);
- } else
-#endif
- {
- char *addr = ((char *)kmap (page)) + offset;
- struct iovec fragiov = {.iov_base = addr,
- .iov_len = fragsize};
- struct msghdr msg = {
- .msg_name = NULL,
- .msg_namelen = 0,
- .msg_iov = &fragiov,
- .msg_iovlen = 1,
- .msg_control = NULL,
- .msg_controllen = 0,
- .msg_flags = more ? (MSG_DONTWAIT | MSG_MORE) : MSG_DONTWAIT
- };
- mm_segment_t oldmm = get_fs();
-
- set_fs (KERNEL_DS);
- rc = sock->sk->prot->sendmsg(sock->sk, &msg, fragsize);
- set_fs (oldmm);
- kunmap (page);
+ rc = ksocknal_connsock_addref(conn);
+ if (rc != 0) {
+ LASSERT (conn->ksnc_closing);
+ return (-ESHUTDOWN);
}
- if (rc <= 0)
- return (rc);
+ do {
+ if (ksocknal_data.ksnd_enomem_tx > 0) {
+ /* testing... */
+ ksocknal_data.ksnd_enomem_tx--;
+ rc = -EAGAIN;
+ } else if (tx->tx_niov != 0) {
+ rc = ksocknal_send_iov (conn, tx);
+ } else {
+ rc = ksocknal_send_kiov (conn, tx);
+ }
- tx->tx_nob -= rc;
+ bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
+ if (rc > 0) /* sent something? */
+ conn->ksnc_tx_bufnob += rc; /* account it */
- if (rc < fragsize) {
- /* didn't send whole frag */
- kiov->kiov_offset = offset + rc;
- kiov->kiov_len = fragsize - rc;
- return (-EAGAIN);
- }
+ if (bufnob < conn->ksnc_tx_bufnob) {
+ /* allocated send buffer bytes < computed; infer
+ * something got ACKed */
+ conn->ksnc_tx_deadline =
+ cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
+ conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
+ conn->ksnc_tx_bufnob = bufnob;
+ smp_mb();
+ }
- /* everything went */
- LASSERT (rc == fragsize);
- tx->tx_kiov++;
- tx->tx_nkiov--;
- return (1);
-}
+ if (rc <= 0) { /* Didn't write anything? */
-int
-ksocknal_sendmsg (struct socket *sock, ksock_tx_t *tx, int more)
-{
- int rc;
- int sent_some = 0;
- ENTRY;
-
- LASSERT (!in_interrupt());
+ if (rc == 0) /* some stacks return 0 instead of -EAGAIN */
+ rc = -EAGAIN;
- for (;;) {
- if (tx->tx_niov != 0)
- rc = ksocknal_send_iov (sock, tx, more || tx->tx_nkiov != 0);
- else
- rc = ksocknal_send_kiov (sock, tx, more);
+ /* Check if EAGAIN is due to memory pressure */
+ if(rc == -EAGAIN && ksocknal_lib_memory_pressure(conn))
+ rc = -ENOMEM;
- /* Interpret a zero rc the same as -EAGAIN (Adaptech TOE) */
- if (rc <= 0) /* error or partial send */
- RETURN ((sent_some || rc == -EAGAIN) ? 0 : rc);
-
- if (tx->tx_nob == 0) /* sent everything */
- RETURN (0);
+ break;
+ }
- sent_some = 1;
- }
+ /* socket's wmem_queued now includes 'rc' bytes */
+ atomic_sub (rc, &conn->ksnc_tx_nob);
+ rc = 0;
+
+ } while (tx->tx_resid != 0);
+
+ ksocknal_connsock_decref(conn);
+ return (rc);
}
-int
+static int
ksocknal_recv_iov (ksock_conn_t *conn)
{
- struct iovec *iov = conn->ksnc_rx_iov;
- int fragsize = iov->iov_len;
- unsigned long vaddr = (unsigned long)iov->iov_base;
- struct iovec fragiov = { .iov_base = (void *)vaddr,
- .iov_len = fragsize};
- struct msghdr msg = {
- .msg_name = NULL,
- .msg_namelen = 0,
- .msg_iov = &fragiov,
- .msg_iovlen = 1,
- .msg_control = NULL,
- .msg_controllen = 0,
- .msg_flags = 0
- };
- mm_segment_t oldmm = get_fs();
- int rc;
-
- /* NB we can't trust socket ops to either consume our iovs
- * or leave them alone, so we only receive 1 frag at a time. */
+ struct kvec *iov = conn->ksnc_rx_iov;
+ int nob;
+ int rc;
+
LASSERT (conn->ksnc_rx_niov > 0);
- LASSERT (fragsize <= conn->ksnc_rx_nob_wanted);
-
- set_fs (KERNEL_DS);
- rc = sock_recvmsg (conn->ksnc_sock, &msg, fragsize, MSG_DONTWAIT);
- /* NB this is just a boolean............................^ */
- set_fs (oldmm);
+
+ /* Never touch conn->ksnc_rx_iov or change connection
+ * status inside ksocknal_lib_recv_iov */
+ rc = ksocknal_lib_recv_iov(conn);
if (rc <= 0)
return (rc);
- conn->ksnc_rx_nob_wanted -= rc;
- conn->ksnc_rx_nob_left -= rc;
-
- if (rc < fragsize) {
- iov->iov_base = (void *)(vaddr + rc);
- iov->iov_len = fragsize - rc;
- return (-EAGAIN);
- }
+ /* received something... */
+ nob = rc;
+
+ conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
+ conn->ksnc_rx_deadline =
+ cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
+ smp_mb(); /* order with setting rx_started */
+ conn->ksnc_rx_started = 1;
+
+ conn->ksnc_rx_nob_wanted -= nob;
+ conn->ksnc_rx_nob_left -= nob;
+
+ do {
+ LASSERT (conn->ksnc_rx_niov > 0);
+
+ if (nob < (int)iov->iov_len) {
+ iov->iov_len -= nob;
+ iov->iov_base += nob;
+ return (-EAGAIN);
+ }
+
+ nob -= iov->iov_len;
+ conn->ksnc_rx_iov = ++iov;
+ conn->ksnc_rx_niov--;
+ } while (nob != 0);
- LASSERT (rc == fragsize);
- conn->ksnc_rx_iov++;
- conn->ksnc_rx_niov--;
- return (1);
+ return (rc);
}
-int
+static int
ksocknal_recv_kiov (ksock_conn_t *conn)
{
- ptl_kiov_t *kiov = conn->ksnc_rx_kiov;
- struct page *page = kiov->kiov_page;
- int offset = kiov->kiov_offset;
- int fragsize = kiov->kiov_len;
- unsigned long vaddr = ((unsigned long)kmap (page)) + offset;
- struct iovec fragiov = { .iov_base = (void *)vaddr,
- .iov_len = fragsize};
- struct msghdr msg = {
- .msg_name = NULL,
- .msg_namelen = 0,
- .msg_iov = &fragiov,
- .msg_iovlen = 1,
- .msg_control = NULL,
- .msg_controllen = 0,
- .msg_flags = 0
- };
- mm_segment_t oldmm = get_fs();
- int rc;
-
- /* NB we can't trust socket ops to either consume our iovs
- * or leave them alone, so we only receive 1 frag at a time. */
- LASSERT (fragsize <= conn->ksnc_rx_nob_wanted);
+ lnet_kiov_t *kiov = conn->ksnc_rx_kiov;
+ int nob;
+ int rc;
LASSERT (conn->ksnc_rx_nkiov > 0);
- LASSERT (offset + fragsize <= PAGE_SIZE);
-
- set_fs (KERNEL_DS);
- rc = sock_recvmsg (conn->ksnc_sock, &msg, fragsize, MSG_DONTWAIT);
- /* NB this is just a boolean............................^ */
- set_fs (oldmm);
- kunmap (page);
-
+
+ /* Never touch conn->ksnc_rx_kiov or change connection
+ * status inside ksocknal_lib_recv_iov */
+ rc = ksocknal_lib_recv_kiov(conn);
+
if (rc <= 0)
return (rc);
-
- conn->ksnc_rx_nob_wanted -= rc;
- conn->ksnc_rx_nob_left -= rc;
-
- if (rc < fragsize) {
- kiov->kiov_offset = offset + rc;
- kiov->kiov_len = fragsize - rc;
- return (-EAGAIN);
- }
- LASSERT (rc == fragsize);
- conn->ksnc_rx_kiov++;
- conn->ksnc_rx_nkiov--;
- return (1);
+ /* received something... */
+ nob = rc;
+
+ conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
+ conn->ksnc_rx_deadline =
+ cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
+ smp_mb(); /* order with setting rx_started */
+ conn->ksnc_rx_started = 1;
+
+ conn->ksnc_rx_nob_wanted -= nob;
+ conn->ksnc_rx_nob_left -= nob;
+
+ do {
+ LASSERT (conn->ksnc_rx_nkiov > 0);
+
+ if (nob < (int) kiov->kiov_len) {
+ kiov->kiov_offset += nob;
+ kiov->kiov_len -= nob;
+ return -EAGAIN;
+ }
+
+ nob -= kiov->kiov_len;
+ conn->ksnc_rx_kiov = ++kiov;
+ conn->ksnc_rx_nkiov--;
+ } while (nob != 0);
+
+ return 1;
}
-int
-ksocknal_recvmsg (ksock_conn_t *conn)
+static int
+ksocknal_receive (ksock_conn_t *conn)
{
- int rc;
- int got_some = 0;
+ /* Return 1 on success, 0 on EOF, < 0 on error.
+ * Caller checks ksnc_rx_nob_wanted to determine
+ * progress/completion. */
+ int rc;
ENTRY;
-
- LASSERT (!in_interrupt ());
+
+ if (ksocknal_data.ksnd_stall_rx != 0) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(cfs_time_seconds(ksocknal_data.ksnd_stall_rx));
+ }
+
+ rc = ksocknal_connsock_addref(conn);
+ if (rc != 0) {
+ LASSERT (conn->ksnc_closing);
+ return (-ESHUTDOWN);
+ }
for (;;) {
- LASSERT (conn->ksnc_rx_nob_wanted > 0);
-
if (conn->ksnc_rx_niov != 0)
rc = ksocknal_recv_iov (conn);
else
rc = ksocknal_recv_kiov (conn);
- /* CAVEAT EMPTOR: we return...
- * <= 0 for error (0 == EOF) and > 0 for success (unlike sendmsg()) */
+ if (rc <= 0) {
+ /* error/EOF or partial receive */
+ if (rc == -EAGAIN) {
+ rc = 1;
+ } else if (rc == 0 && conn->ksnc_rx_started) {
+ /* EOF in the middle of a message */
+ rc = -EPROTO;
+ }
+ break;
+ }
- if (rc <= 0) /* error/EOF or partial receive */
- RETURN ((got_some || rc == -EAGAIN) ? 1 : rc);
-
- if (conn->ksnc_rx_nob_wanted == 0)
- RETURN (1);
+ /* Completed a fragment */
- got_some = 0;
+ if (conn->ksnc_rx_nob_wanted == 0) {
+ rc = 1;
+ break;
+ }
}
-}
-#if SOCKNAL_ZC
-void
-ksocknal_zc_callback (zccd_t *zcd)
-{
- ksock_tx_t *tx = KSOCK_ZCCD_2_TX(zcd);
- ksock_sched_t *sched = tx->tx_sched;
- unsigned long flags;
- ENTRY;
-
- /* Schedule tx for cleanup (can't do it now due to lock conflicts) */
-
- spin_lock_irqsave (&sched->kss_lock, flags);
-
- list_add_tail (&tx->tx_list, &sched->kss_zctxdone_list);
- if (waitqueue_active (&sched->kss_waitq))
- wake_up (&sched->kss_waitq);
-
- spin_unlock_irqrestore (&sched->kss_lock, flags);
- EXIT;
+ ksocknal_connsock_decref(conn);
+ RETURN (rc);
}
-#endif
void
-ksocknal_tx_done (ksock_tx_t *tx)
+ksocknal_tx_done (lnet_ni_t *ni, ksock_tx_t *tx)
{
- long flags;
- ksock_ltx_t *ltx;
+ lnet_msg_t *lnetmsg = tx->tx_lnetmsg;
+ int rc = (tx->tx_resid == 0 && !tx->tx_zc_aborted) ? 0 : -EIO;
ENTRY;
- atomic_dec (&ksocknal_packets_being_sent);
-
- if (tx->tx_isfwd) { /* was a forwarded packet? */
- kpr_fwd_done (&ksocknal_data.ksnd_router,
- KSOCK_TX_2_KPR_FWD_DESC (tx), 0);
- EXIT;
- return;
- }
-
- /* local send */
- ltx = KSOCK_TX_2_KSOCK_LTX (tx);
-
- lib_finalize (&ksocknal_lib, ltx->ltx_private, ltx->ltx_cookie);
+ LASSERT(ni != NULL || tx->tx_conn != NULL);
- spin_lock_irqsave (&ksocknal_data.ksnd_idle_ltx_lock, flags);
+ if (tx->tx_conn != NULL)
+ ksocknal_conn_decref(tx->tx_conn);
- list_add_tail (<x->ltx_tx.tx_list, ltx->ltx_idle);
+ if (ni == NULL && tx->tx_conn != NULL)
+ ni = tx->tx_conn->ksnc_peer->ksnp_ni;
- /* normal tx desc => wakeup anyone blocking for one */
- if (ltx->ltx_idle == &ksocknal_data.ksnd_idle_ltx_list &&
- waitqueue_active (&ksocknal_data.ksnd_idle_ltx_waitq))
- wake_up (&ksocknal_data.ksnd_idle_ltx_waitq);
+ ksocknal_free_tx (tx);
+ if (lnetmsg != NULL) /* KSOCK_MSG_NOOP go without lnetmsg */
+ lnet_finalize (ni, lnetmsg, rc);
- spin_unlock_irqrestore (&ksocknal_data.ksnd_idle_ltx_lock, flags);
EXIT;
}
void
-ksocknal_process_transmit (ksock_sched_t *sched, long *irq_flags)
+ksocknal_txlist_done(lnet_ni_t *ni, struct list_head *txlist, int error)
{
- ksock_conn_t *conn;
ksock_tx_t *tx;
- int rc;
- LASSERT (!list_empty (&sched->kss_tx_conns));
- conn = list_entry(sched->kss_tx_conns.next, ksock_conn_t, ksnc_tx_list);
- list_del (&conn->ksnc_tx_list);
+ while (!list_empty(txlist)) {
+ tx = list_entry(txlist->next, ksock_tx_t, tx_list);
+
+ if (error && tx->tx_lnetmsg != NULL) {
+ CNETERR("Deleting packet type %d len %d %s->%s\n",
+ le32_to_cpu (tx->tx_lnetmsg->msg_hdr.type),
+ le32_to_cpu (tx->tx_lnetmsg->msg_hdr.payload_length),
+ libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.src_nid)),
+ libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.dest_nid)));
+ } else if (error) {
+ CNETERR("Deleting noop packet\n");
+ }
+
+ list_del(&tx->tx_list);
- LASSERT (conn->ksnc_tx_scheduled);
- LASSERT (conn->ksnc_tx_ready);
- LASSERT (!list_empty (&conn->ksnc_tx_queue));
- tx = list_entry (conn->ksnc_tx_queue.next, ksock_tx_t, tx_list);
- /* assume transmit will complete now, so dequeue while I've got lock */
- list_del (&tx->tx_list);
+ LASSERT (atomic_read(&tx->tx_refcount) == 1);
+ ksocknal_tx_done (ni, tx);
+ }
+}
- spin_unlock_irqrestore (&sched->kss_lock, *irq_flags);
+static void
+ksocknal_check_zc_req(ksock_tx_t *tx)
+{
+ ksock_conn_t *conn = tx->tx_conn;
+ ksock_peer_t *peer = conn->ksnc_peer;
+
+ /* Set tx_msg.ksm_zc_cookies[0] to a unique non-zero cookie and add tx
+ * to ksnp_zc_req_list if some fragment of this message should be sent
+ * zero-copy. Our peer will send an ACK containing this cookie when
+ * she has received this message to tell us we can signal completion.
+ * tx_msg.ksm_zc_cookies[0] remains non-zero while tx is on
+ * ksnp_zc_req_list. */
+ LASSERT (tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
+ LASSERT (tx->tx_zc_capable);
+
+ tx->tx_zc_checked = 1;
+
+ if (conn->ksnc_proto == &ksocknal_protocol_v1x ||
+ !conn->ksnc_zc_capable)
+ return;
- LASSERT (tx->tx_nob > 0);
+ /* assign cookie and queue tx to pending list, it will be released when
+ * a matching ack is received. See ksocknal_handle_zcack() */
- conn->ksnc_tx_ready = 0;/* write_space may race with me and set ready */
- mb(); /* => clear BEFORE trying to write */
+ ksocknal_tx_addref(tx);
- rc = ksocknal_sendmsg (conn->ksnc_sock, tx,
- !list_empty (&conn->ksnc_tx_queue)); /* more to come? */
+ spin_lock(&peer->ksnp_lock);
- CDEBUG (D_NET, "send(%d) %d\n", tx->tx_nob, rc);
+ /* ZC_REQ is going to be pinned to the peer */
+ tx->tx_deadline =
+ cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
- if (rc != 0) {
-#warning FIXME: handle socket errors properly
- CERROR("Error socknal send(%d) %p: %d\n", tx->tx_nob, conn, rc);
- /* kid on for now the whole packet went.
- * NB when we handle the error better, we'll still need to
- * block for zccd completion.
- */
- tx->tx_nob = 0;
- }
+ LASSERT (tx->tx_msg.ksm_zc_cookies[0] == 0);
- if (tx->tx_nob == 0) /* nothing left to send */
- {
- /* everything went; assume more can go, so prevent write_space locking */
- conn->ksnc_tx_ready = 1;
-
- ksocknal_put_conn (conn); /* release packet's ref */
- atomic_inc (&ksocknal_packets_being_sent);
-#if SOCKNAL_ZC
- if (atomic_read (&tx->tx_zccd.zccd_count) != 1) {
- /* zccd skbufs are still in-flight. Release my
- * initial ref on zccd, so callback can occur */
- zccd_put (&tx->tx_zccd);
- } else
-#endif
- ksocknal_tx_done (tx);
+ tx->tx_msg.ksm_zc_cookies[0] = peer->ksnp_zc_next_cookie++;
- spin_lock_irqsave (&sched->kss_lock, *irq_flags);
- } else {
- spin_lock_irqsave (&sched->kss_lock, *irq_flags);
+ if (peer->ksnp_zc_next_cookie == 0)
+ peer->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
- /* back onto HEAD of tx_queue */
- list_add (&tx->tx_list, &conn->ksnc_tx_queue);
- }
+ list_add_tail(&tx->tx_zc_list, &peer->ksnp_zc_req_list);
- if (!conn->ksnc_tx_ready || /* no space to write now */
- list_empty (&conn->ksnc_tx_queue)) {/* nothing to write */
- conn->ksnc_tx_scheduled = 0; /* not being scheduled */
- ksocknal_put_conn (conn); /* release scheduler's ref */
- } else /* let scheduler call me again */
- list_add_tail (&conn->ksnc_tx_list, &sched->kss_tx_conns);
+ spin_unlock(&peer->ksnp_lock);
}
-void
-ksocknal_launch_packet (ksock_conn_t *conn, ksock_tx_t *tx)
+static void
+ksocknal_uncheck_zc_req(ksock_tx_t *tx)
{
- unsigned long flags;
- ksock_sched_t *sched = conn->ksnc_scheduler;
-
- /* Ensure the frags we've been given EXACTLY match the number of
- * bytes we want to send. Many TCP/IP stacks disregard any total
- * size parameters passed to them and just look at the frags.
- *
- * We always expect at least 1 mapped fragment containing the
- * complete portals header.
- */
- LASSERT (lib_iov_nob (tx->tx_niov, tx->tx_iov) +
- lib_kiov_nob (tx->tx_nkiov, tx->tx_kiov) == tx->tx_nob);
- LASSERT (tx->tx_niov >= 1);
- LASSERT (tx->tx_iov[0].iov_len >= sizeof (ptl_hdr_t));
-
- CDEBUG (D_NET, "type %d, nob %d niov %d nkiov %d\n",
- ((ptl_hdr_t *)tx->tx_iov[0].iov_base)->type, tx->tx_nob,
- tx->tx_niov, tx->tx_nkiov);
-
-#if SOCKNAL_ZC
- zccd_init (&tx->tx_zccd, ksocknal_zc_callback);
- /* NB this sets 1 ref on zccd, so the callback can only occur
- * after I've released this ref */
- tx->tx_sched = sched;
-#endif
- spin_lock_irqsave (&sched->kss_lock, flags);
+ ksock_peer_t *peer = tx->tx_conn->ksnc_peer;
- list_add_tail (&tx->tx_list, &conn->ksnc_tx_queue);
+ LASSERT(tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
+ LASSERT(tx->tx_zc_capable);
- if (conn->ksnc_tx_ready && /* able to send */
- !conn->ksnc_tx_scheduled) { /* not scheduled to send */
- list_add_tail (&conn->ksnc_tx_list, &sched->kss_tx_conns);
- conn->ksnc_tx_scheduled = 1;
- atomic_inc (&conn->ksnc_refcount); /* extra ref for scheduler */
- if (waitqueue_active (&sched->kss_waitq))
- wake_up (&sched->kss_waitq);
- }
-
- spin_unlock_irqrestore (&sched->kss_lock, flags);
+ tx->tx_zc_checked = 0;
- atomic_inc (&ksocknal_packets_launched);
-}
+ spin_lock(&peer->ksnp_lock);
-ksock_conn_t *
-ksocknal_send_target (ptl_nid_t nid)
-{
- ptl_nid_t gatewaynid;
- ksock_conn_t *conn;
- int rc;
+ if (tx->tx_msg.ksm_zc_cookies[0] == 0) {
+ /* Not waiting for an ACK */
+ spin_unlock(&peer->ksnp_lock);
+ return;
+ }
- if ((conn = ksocknal_get_conn (nid)) == NULL) {
- /* It's not a peer; try to find a gateway */
- rc = kpr_lookup (&ksocknal_data.ksnd_router, nid, &gatewaynid);
- if (rc != 0) {
- CERROR("Can't route to "LPX64": router error %d\n",
- nid, rc);
- return (NULL);
- }
+ tx->tx_msg.ksm_zc_cookies[0] = 0;
+ list_del(&tx->tx_zc_list);
- if ((conn = ksocknal_get_conn (gatewaynid)) == NULL) {
- CERROR ("Can't route to "LPX64": gateway "LPX64
- " is not a peer\n", nid, gatewaynid);
- return (NULL);
- }
- }
+ spin_unlock(&peer->ksnp_lock);
- return (conn);
+ ksocknal_tx_decref(tx);
}
-ksock_ltx_t *
-ksocknal_setup_hdr (nal_cb_t *nal, void *private, lib_msg_t *cookie,
- ptl_hdr_t *hdr, int type)
+static int
+ksocknal_process_transmit (ksock_conn_t *conn, ksock_tx_t *tx)
{
- ksock_ltx_t *ltx;
-
- /* I may not block for a transmit descriptor if I might block the
- * receiver, or an interrupt handler. */
- ltx = ksocknal_get_ltx (!(type == PTL_MSG_ACK ||
- type == PTL_MSG_REPLY ||
- in_interrupt ()));
- if (ltx == NULL) {
- CERROR ("Can't allocate tx desc\n");
- return (NULL);
- }
+ int rc;
- /* Init local send packet (storage for hdr, finalize() args) */
- ltx->ltx_hdr = *hdr;
- ltx->ltx_private = private;
- ltx->ltx_cookie = cookie;
-
- /* Init common ltx_tx */
- ltx->ltx_tx.tx_isfwd = 0;
- ltx->ltx_tx.tx_nob = sizeof (*hdr);
-
- /* We always have 1 mapped frag for the header */
- ltx->ltx_tx.tx_niov = 1;
- ltx->ltx_tx.tx_iov = <x->ltx_iov_space.hdr;
- ltx->ltx_tx.tx_iov[0].iov_base = <x->ltx_hdr;
- ltx->ltx_tx.tx_iov[0].iov_len = sizeof (ltx->ltx_hdr);
-
- ltx->ltx_tx.tx_kiov = NULL;
- ltx->ltx_tx.tx_nkiov = 0;
-
- return (ltx);
-}
+ if (tx->tx_zc_capable && !tx->tx_zc_checked)
+ ksocknal_check_zc_req(tx);
-int
-ksocknal_send (nal_cb_t *nal, void *private, lib_msg_t *cookie,
- ptl_hdr_t *hdr, int type, ptl_nid_t nid, ptl_pid_t pid,
- unsigned int payload_niov, struct iovec *payload_iov,
- size_t payload_len)
-{
- ksock_ltx_t *ltx;
- ksock_conn_t *conn;
+ rc = ksocknal_transmit (conn, tx);
- /* NB 'private' is different depending on what we're sending.
- * Just ignore it until we can rely on it
- *
- * Also, the return code from this procedure is ignored.
- * If we can't send, we must still complete with lib_finalize().
- * We'll have to wait for 3.2 to return an error event.
- */
+ CDEBUG (D_NET, "send(%d) %d\n", tx->tx_resid, rc);
- CDEBUG(D_NET,
- "sending "LPSZ" bytes in %d mapped frags to nid: "LPX64
- " pid %d\n", payload_len, payload_niov, nid, pid);
+ if (tx->tx_resid == 0) {
+ /* Sent everything OK */
+ LASSERT (rc == 0);
- conn = ksocknal_send_target (nid);
- if (conn == NULL) {
- lib_finalize (&ksocknal_lib, private, cookie);
- return (-1);
+ return (0);
}
- ltx = ksocknal_setup_hdr (nal, private, cookie, hdr, type);
- if (ltx == NULL) {
- ksocknal_put_conn (conn);
- lib_finalize (&ksocknal_lib, private, cookie);
- return (-1);
+ if (rc == -EAGAIN)
+ return (rc);
+
+ if (rc == -ENOMEM) {
+ static int counter;
+
+ counter++; /* exponential backoff warnings */
+ if ((counter & (-counter)) == counter)
+ CWARN("%u ENOMEM tx %p (%u allocated)\n",
+ counter, conn, atomic_read(&libcfs_kmemory));
+
+ /* Queue on ksnd_enomem_conns for retry after a timeout */
+ spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
+
+ /* enomem list takes over scheduler's ref... */
+ LASSERT (conn->ksnc_tx_scheduled);
+ list_add_tail(&conn->ksnc_tx_list,
+ &ksocknal_data.ksnd_enomem_conns);
+ if (!cfs_time_aftereq(cfs_time_add(cfs_time_current(),
+ SOCKNAL_ENOMEM_RETRY),
+ ksocknal_data.ksnd_reaper_waketime))
+ wake_up(&ksocknal_data.ksnd_reaper_waitq);
+
+ spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
+ return (rc);
+ }
+
+ /* Actual error */
+ LASSERT (rc < 0);
+
+ if (!conn->ksnc_closing) {
+ switch (rc) {
+ case -ECONNRESET:
+ LCONSOLE_WARN("Host %pI4h reset our connection "
+ "while we were sending data; it may have "
+ "rebooted.\n",
+ &conn->ksnc_ipaddr);
+ break;
+ default:
+ LCONSOLE_WARN("There was an unexpected network error "
+ "while writing to %pI4h: %d.\n",
+ &conn->ksnc_ipaddr, rc);
+ break;
+ }
+ CDEBUG(D_NET, "[%p] Error %d on write to %s ip %pI4h:%d\n",
+ conn, rc, libcfs_id2str(conn->ksnc_peer->ksnp_id),
+ &conn->ksnc_ipaddr, conn->ksnc_port);
}
- /* append the payload_iovs to the one pointing at the header */
- LASSERT (ltx->ltx_tx.tx_niov == 1 && ltx->ltx_tx.tx_nkiov == 0);
- LASSERT (payload_niov <= PTL_MD_MAX_IOV);
+ if (tx->tx_zc_checked)
+ ksocknal_uncheck_zc_req(tx);
- memcpy (ltx->ltx_tx.tx_iov + 1, payload_iov,
- payload_niov * sizeof (*payload_iov));
- ltx->ltx_tx.tx_niov = 1 + payload_niov;
- ltx->ltx_tx.tx_nob = sizeof (*hdr) + payload_len;
+ /* it's not an error if conn is being closed */
+ ksocknal_close_conn_and_siblings (conn,
+ (conn->ksnc_closing) ? 0 : rc);
- ksocknal_launch_packet (conn, <x->ltx_tx);
- return (0);
+ return (rc);
}
-int
-ksocknal_send_pages (nal_cb_t *nal, void *private, lib_msg_t *cookie,
- ptl_hdr_t *hdr, int type, ptl_nid_t nid, ptl_pid_t pid,
- unsigned int payload_niov, ptl_kiov_t *payload_iov, size_t payload_len)
+static void
+ksocknal_launch_connection_locked (ksock_route_t *route)
{
- ksock_ltx_t *ltx;
- ksock_conn_t *conn;
-
- /* NB 'private' is different depending on what we're sending.
- * Just ignore it until we can rely on it */
- CDEBUG(D_NET,
- "sending "LPSZ" bytes in %d mapped frags to nid: "LPX64" pid %d\n",
- payload_len, payload_niov, nid, pid);
+ /* called holding write lock on ksnd_global_lock */
- conn = ksocknal_send_target (nid);
- if (conn == NULL)
- return (-1);
+ LASSERT (!route->ksnr_scheduled);
+ LASSERT (!route->ksnr_connecting);
+ LASSERT ((ksocknal_route_mask() & ~route->ksnr_connected) != 0);
- ltx = ksocknal_setup_hdr (nal, private, cookie, hdr, type);
- if (ltx == NULL) {
- ksocknal_put_conn (conn);
- return (-1);
- }
+ route->ksnr_scheduled = 1; /* scheduling conn for connd */
+ ksocknal_route_addref(route); /* extra ref for connd */
- LASSERT (ltx->ltx_tx.tx_niov == 1 && ltx->ltx_tx.tx_nkiov == 0);
- LASSERT (payload_niov <= PTL_MD_MAX_IOV);
-
- ltx->ltx_tx.tx_kiov = ltx->ltx_iov_space.payload.kiov;
- memcpy (ltx->ltx_tx.tx_kiov, payload_iov,
- payload_niov * sizeof (*payload_iov));
- ltx->ltx_tx.tx_nkiov = payload_niov;
- ltx->ltx_tx.tx_nob = sizeof (*hdr) + payload_len;
+ spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
- ksocknal_launch_packet (conn, <x->ltx_tx);
- return (0);
+ list_add_tail(&route->ksnr_connd_list,
+ &ksocknal_data.ksnd_connd_routes);
+ wake_up(&ksocknal_data.ksnd_connd_waitq);
+
+ spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
}
void
-ksocknal_fwd_packet (void *arg, kpr_fwd_desc_t *fwd)
+ksocknal_launch_all_connections_locked (ksock_peer_t *peer)
{
- ksock_conn_t *conn;
- ptl_nid_t nid = fwd->kprfd_gateway_nid;
- ksock_tx_t *tx = (ksock_tx_t *)&fwd->kprfd_scratch;
+ ksock_route_t *route;
- CDEBUG (D_NET, "Forwarding [%p] -> "LPX64" ("LPX64"))\n", fwd,
- fwd->kprfd_gateway_nid, fwd->kprfd_target_nid);
-
- /* I'm the gateway; must be the last hop */
- if (nid == ksocknal_lib.ni.nid)
- nid = fwd->kprfd_target_nid;
+ /* called holding write lock on ksnd_global_lock */
+ for (;;) {
+ /* launch any/all connections that need it */
+ route = ksocknal_find_connectable_route_locked(peer);
+ if (route == NULL)
+ return;
- conn = ksocknal_get_conn (nid);
- if (conn == NULL) {
- CERROR ("[%p] fwd to "LPX64" isn't a peer\n", fwd, nid);
- kpr_fwd_done (&ksocknal_data.ksnd_router, fwd, -EHOSTUNREACH);
- return;
+ ksocknal_launch_connection_locked(route);
}
-
- /* This forward has now got a ref on conn */
-
- tx->tx_isfwd = 1; /* This is a forwarding packet */
- tx->tx_nob = fwd->kprfd_nob;
- tx->tx_niov = fwd->kprfd_niov;
- tx->tx_iov = fwd->kprfd_iov;
- tx->tx_nkiov = 0;
- tx->tx_kiov = NULL;
-
- ksocknal_launch_packet (conn, tx);
}
-int
-ksocknal_thread_start (int (*fn)(void *arg), void *arg)
+ksock_conn_t *
+ksocknal_find_conn_locked(ksock_peer_t *peer, ksock_tx_t *tx, int nonblk)
{
- long pid = kernel_thread (fn, arg, 0);
+ struct list_head *tmp;
+ ksock_conn_t *conn;
+ ksock_conn_t *typed = NULL;
+ ksock_conn_t *fallback = NULL;
+ int tnob = 0;
+ int fnob = 0;
+
+ list_for_each(tmp, &peer->ksnp_conns) {
+ ksock_conn_t *c = list_entry(tmp, ksock_conn_t, ksnc_list);
+ int nob = atomic_read(&c->ksnc_tx_nob) +
+ c->ksnc_sock->sk->sk_wmem_queued;
+ int rc;
+
+ LASSERT (!c->ksnc_closing);
+ LASSERT (c->ksnc_proto != NULL &&
+ c->ksnc_proto->pro_match_tx != NULL);
+
+ rc = c->ksnc_proto->pro_match_tx(c, tx, nonblk);
+
+ switch (rc) {
+ default:
+ LBUG();
+ case SOCKNAL_MATCH_NO: /* protocol rejected the tx */
+ continue;
+
+ case SOCKNAL_MATCH_YES: /* typed connection */
+ if (typed == NULL || tnob > nob ||
+ (tnob == nob && *ksocknal_tunables.ksnd_round_robin &&
+ cfs_time_after(typed->ksnc_tx_last_post, c->ksnc_tx_last_post))) {
+ typed = c;
+ tnob = nob;
+ }
+ break;
+
+ case SOCKNAL_MATCH_MAY: /* fallback connection */
+ if (fallback == NULL || fnob > nob ||
+ (fnob == nob && *ksocknal_tunables.ksnd_round_robin &&
+ cfs_time_after(fallback->ksnc_tx_last_post, c->ksnc_tx_last_post))) {
+ fallback = c;
+ fnob = nob;
+ }
+ break;
+ }
+ }
- if (pid < 0)
- return ((int)pid);
+ /* prefer the typed selection */
+ conn = (typed != NULL) ? typed : fallback;
- atomic_inc (&ksocknal_data.ksnd_nthreads);
- return (0);
+ if (conn != NULL)
+ conn->ksnc_tx_last_post = cfs_time_current();
+
+ return conn;
}
void
-ksocknal_thread_fini (void)
+ksocknal_tx_prep(ksock_conn_t *conn, ksock_tx_t *tx)
{
- atomic_dec (&ksocknal_data.ksnd_nthreads);
+ conn->ksnc_proto->pro_pack(tx);
+
+ atomic_add (tx->tx_nob, &conn->ksnc_tx_nob);
+ ksocknal_conn_addref(conn); /* +1 ref for tx */
+ tx->tx_conn = conn;
}
void
-ksocknal_fmb_callback (void *arg, int error)
+ksocknal_queue_tx_locked (ksock_tx_t *tx, ksock_conn_t *conn)
{
- ksock_fmb_t *fmb = (ksock_fmb_t *)arg;
- ksock_fmb_pool_t *fmp = fmb->fmb_pool;
- ptl_hdr_t *hdr = (ptl_hdr_t *) page_address(fmb->fmb_pages[0]);
- ksock_conn_t *conn = NULL;
- ksock_sched_t *sched;
- long flags;
-
- if (error != 0)
- CERROR("Failed to route packet from "LPX64" to "LPX64": %d\n",
- NTOH__u64(hdr->src_nid), NTOH__u64(hdr->dest_nid),
- error);
- else
- CDEBUG (D_NET, "routed packet from "LPX64" to "LPX64": OK\n",
- NTOH__u64 (hdr->src_nid), NTOH__u64 (hdr->dest_nid));
-
- spin_lock_irqsave (&fmp->fmp_lock, flags);
-
- list_add (&fmb->fmb_list, &fmp->fmp_idle_fmbs);
-
- if (!list_empty (&fmp->fmp_blocked_conns)) {
- conn = list_entry (fmb->fmb_pool->fmp_blocked_conns.next,
- ksock_conn_t, ksnc_rx_list);
- list_del (&conn->ksnc_rx_list);
- }
-
- spin_unlock_irqrestore (&fmp->fmp_lock, flags);
+ ksock_sched_t *sched = conn->ksnc_scheduler;
+ struct ksock_msg *msg = &tx->tx_msg;
+ ksock_tx_t *ztx = NULL;
+ int bufnob = 0;
- if (conn == NULL)
- return;
+ /* called holding global lock (read or irq-write) and caller may
+ * not have dropped this lock between finding conn and calling me,
+ * so we don't need the {get,put}connsock dance to deref
+ * ksnc_sock... */
+ LASSERT(!conn->ksnc_closing);
- CDEBUG (D_NET, "Scheduling conn %p\n", conn);
- LASSERT (conn->ksnc_rx_scheduled);
- LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_FMB_SLEEP);
+ CDEBUG(D_NET, "Sending to %s ip %pI4h:%d\n",
+ libcfs_id2str(conn->ksnc_peer->ksnp_id),
+ &conn->ksnc_ipaddr, conn->ksnc_port);
- conn->ksnc_rx_state = SOCKNAL_RX_GET_FMB;
+ ksocknal_tx_prep(conn, tx);
- sched = conn->ksnc_scheduler;
+ /* Ensure the frags we've been given EXACTLY match the number of
+ * bytes we want to send. Many TCP/IP stacks disregard any total
+ * size parameters passed to them and just look at the frags.
+ *
+ * We always expect at least 1 mapped fragment containing the
+ * complete ksocknal message header. */
+ LASSERT (lnet_iov_nob (tx->tx_niov, tx->tx_iov) +
+ lnet_kiov_nob(tx->tx_nkiov, tx->tx_kiov) ==
+ (unsigned int)tx->tx_nob);
+ LASSERT (tx->tx_niov >= 1);
+ LASSERT (tx->tx_resid == tx->tx_nob);
+
+ CDEBUG (D_NET, "Packet %p type %d, nob %d niov %d nkiov %d\n",
+ tx, (tx->tx_lnetmsg != NULL) ? tx->tx_lnetmsg->msg_hdr.type:
+ KSOCK_MSG_NOOP,
+ tx->tx_nob, tx->tx_niov, tx->tx_nkiov);
+
+ bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
+ spin_lock_bh(&sched->kss_lock);
+
+ if (list_empty(&conn->ksnc_tx_queue) && bufnob == 0) {
+ /* First packet starts the timeout */
+ conn->ksnc_tx_deadline =
+ cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
+ if (conn->ksnc_tx_bufnob > 0) /* something got ACKed */
+ conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
+ conn->ksnc_tx_bufnob = 0;
+ smp_mb(); /* order with adding to tx_queue */
+ }
+
+ if (msg->ksm_type == KSOCK_MSG_NOOP) {
+ /* The packet is noop ZC ACK, try to piggyback the ack_cookie
+ * on a normal packet so I don't need to send it */
+ LASSERT (msg->ksm_zc_cookies[1] != 0);
+ LASSERT (conn->ksnc_proto->pro_queue_tx_zcack != NULL);
+
+ if (conn->ksnc_proto->pro_queue_tx_zcack(conn, tx, 0))
+ ztx = tx; /* ZC ACK piggybacked on ztx release tx later */
- spin_lock_irqsave (&sched->kss_lock, flags);
+ } else {
+ /* It's a normal packet - can it piggback a noop zc-ack that
+ * has been queued already? */
+ LASSERT (msg->ksm_zc_cookies[1] == 0);
+ LASSERT (conn->ksnc_proto->pro_queue_tx_msg != NULL);
- list_add_tail (&conn->ksnc_rx_list, &sched->kss_rx_conns);
+ ztx = conn->ksnc_proto->pro_queue_tx_msg(conn, tx);
+ /* ztx will be released later */
+ }
- if (waitqueue_active (&sched->kss_waitq))
- wake_up (&sched->kss_waitq);
+ if (ztx != NULL) {
+ atomic_sub (ztx->tx_nob, &conn->ksnc_tx_nob);
+ list_add_tail(&ztx->tx_list, &sched->kss_zombie_noop_txs);
+ }
- spin_unlock_irqrestore (&sched->kss_lock, flags);
+ if (conn->ksnc_tx_ready && /* able to send */
+ !conn->ksnc_tx_scheduled) { /* not scheduled to send */
+ /* +1 ref for scheduler */
+ ksocknal_conn_addref(conn);
+ list_add_tail(&conn->ksnc_tx_list,
+ &sched->kss_tx_conns);
+ conn->ksnc_tx_scheduled = 1;
+ wake_up(&sched->kss_waitq);
+ }
+
+ spin_unlock_bh(&sched->kss_lock);
}
-ksock_fmb_t *
-ksocknal_get_idle_fmb (ksock_conn_t *conn)
-{
- int payload_nob = conn->ksnc_rx_nob_left;
- int packet_nob = sizeof (ptl_hdr_t) + payload_nob;
- long flags;
- ksock_fmb_pool_t *pool;
- ksock_fmb_t *fmb;
-
- LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_GET_FMB);
- LASSERT (ksocknal_data.ksnd_fmbs != NULL);
- if (packet_nob <= SOCKNAL_SMALL_FWD_PAGES * PAGE_SIZE)
- pool = &ksocknal_data.ksnd_small_fmp;
- else
- pool = &ksocknal_data.ksnd_large_fmp;
+ksock_route_t *
+ksocknal_find_connectable_route_locked (ksock_peer_t *peer)
+{
+ cfs_time_t now = cfs_time_current();
+ struct list_head *tmp;
+ ksock_route_t *route;
+
+ list_for_each(tmp, &peer->ksnp_routes) {
+ route = list_entry(tmp, ksock_route_t, ksnr_list);
+
+ LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
+
+ if (route->ksnr_scheduled) /* connections being established */
+ continue;
+
+ /* all route types connected ? */
+ if ((ksocknal_route_mask() & ~route->ksnr_connected) == 0)
+ continue;
+
+ if (!(route->ksnr_retry_interval == 0 || /* first attempt */
+ cfs_time_aftereq(now, route->ksnr_timeout))) {
+ CDEBUG(D_NET,
+ "Too soon to retry route %pI4h "
+ "(cnted %d, interval %ld, %ld secs later)\n",
+ &route->ksnr_ipaddr,
+ route->ksnr_connected,
+ route->ksnr_retry_interval,
+ cfs_duration_sec(route->ksnr_timeout - now));
+ continue;
+ }
- spin_lock_irqsave (&pool->fmp_lock, flags);
+ return (route);
+ }
- if (!list_empty (&pool->fmp_idle_fmbs)) {
- fmb = list_entry(pool->fmp_idle_fmbs.next,
- ksock_fmb_t, fmb_list);
- list_del (&fmb->fmb_list);
- spin_unlock_irqrestore (&pool->fmp_lock, flags);
+ return (NULL);
+}
- return (fmb);
- }
+ksock_route_t *
+ksocknal_find_connecting_route_locked (ksock_peer_t *peer)
+{
+ struct list_head *tmp;
+ ksock_route_t *route;
- /* deschedule until fmb free */
+ list_for_each(tmp, &peer->ksnp_routes) {
+ route = list_entry(tmp, ksock_route_t, ksnr_list);
- conn->ksnc_rx_state = SOCKNAL_RX_FMB_SLEEP;
+ LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
- list_add_tail (&conn->ksnc_rx_list,
- &pool->fmp_blocked_conns);
+ if (route->ksnr_scheduled)
+ return (route);
+ }
- spin_unlock_irqrestore (&pool->fmp_lock, flags);
return (NULL);
}
-
int
-ksocknal_init_fmb (ksock_conn_t *conn, ksock_fmb_t *fmb)
+ksocknal_launch_packet (lnet_ni_t *ni, ksock_tx_t *tx, lnet_process_id_t id)
{
- int payload_nob = conn->ksnc_rx_nob_left;
- int packet_nob = sizeof (ptl_hdr_t) + payload_nob;
- ptl_nid_t dest_nid = NTOH__u64 (conn->ksnc_hdr.dest_nid);
- int niov; /* at least the header */
- int nob;
+ ksock_peer_t *peer;
+ ksock_conn_t *conn;
+ rwlock_t *g_lock;
+ int retry;
+ int rc;
+
+ LASSERT (tx->tx_conn == NULL);
+
+ g_lock = &ksocknal_data.ksnd_global_lock;
+
+ for (retry = 0;; retry = 1) {
+ read_lock(g_lock);
+ peer = ksocknal_find_peer_locked(ni, id);
+ if (peer != NULL) {
+ if (ksocknal_find_connectable_route_locked(peer) == NULL) {
+ conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
+ if (conn != NULL) {
+ /* I've got no routes that need to be
+ * connecting and I do have an actual
+ * connection... */
+ ksocknal_queue_tx_locked (tx, conn);
+ read_unlock(g_lock);
+ return (0);
+ }
+ }
+ }
- LASSERT (conn->ksnc_rx_scheduled);
- LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_GET_FMB);
- LASSERT (conn->ksnc_rx_nob_wanted == conn->ksnc_rx_nob_left);
- LASSERT (payload_nob >= 0);
- LASSERT (packet_nob <= fmb->fmb_npages * PAGE_SIZE);
- LASSERT (sizeof (ptl_hdr_t) < PAGE_SIZE);
-
- /* Got a forwarding buffer; copy the header we just read into the
- * forwarding buffer. If there's payload start reading reading it
- * into the buffer, otherwise the forwarding buffer can be kicked
- * off immediately.
- *
- * NB fmb->fmb_iov spans the WHOLE packet.
- * conn->ksnc_rx_iov spans just the payload.
- */
+ /* I'll need a write lock... */
+ read_unlock(g_lock);
- fmb->fmb_iov[0].iov_base = page_address (fmb->fmb_pages[0]);
+ write_lock_bh(g_lock);
- /* copy header */
- memcpy (fmb->fmb_iov[0].iov_base, &conn->ksnc_hdr, sizeof (ptl_hdr_t));
+ peer = ksocknal_find_peer_locked(ni, id);
+ if (peer != NULL)
+ break;
- if (payload_nob == 0) { /* got complete packet already */
- atomic_inc (&ksocknal_packets_received);
+ write_unlock_bh(g_lock);
- CDEBUG (D_NET, "%p "LPX64"->"LPX64" %d fwd_start (immediate)\n",
- conn, NTOH__u64 (conn->ksnc_hdr.src_nid),
- dest_nid, packet_nob);
+ if ((id.pid & LNET_PID_USERFLAG) != 0) {
+ CERROR("Refusing to create a connection to "
+ "userspace process %s\n", libcfs_id2str(id));
+ return -EHOSTUNREACH;
+ }
- fmb->fmb_iov[0].iov_len = sizeof (ptl_hdr_t);
+ if (retry) {
+ CERROR("Can't find peer %s\n", libcfs_id2str(id));
+ return -EHOSTUNREACH;
+ }
- kpr_fwd_init (&fmb->fmb_fwd, dest_nid,
- packet_nob, 1, fmb->fmb_iov,
- ksocknal_fmb_callback, fmb);
+ rc = ksocknal_add_peer(ni, id,
+ LNET_NIDADDR(id.nid),
+ lnet_acceptor_port());
+ if (rc != 0) {
+ CERROR("Can't add peer %s: %d\n",
+ libcfs_id2str(id), rc);
+ return rc;
+ }
+ }
- /* forward it now */
- kpr_fwd_start (&ksocknal_data.ksnd_router, &fmb->fmb_fwd);
+ ksocknal_launch_all_connections_locked(peer);
- ksocknal_new_packet (conn, 0); /* on to next packet */
- return (1);
+ conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
+ if (conn != NULL) {
+ /* Connection exists; queue message on it */
+ ksocknal_queue_tx_locked (tx, conn);
+ write_unlock_bh(g_lock);
+ return (0);
}
- niov = 1;
- if (packet_nob <= PAGE_SIZE) { /* whole packet fits in first page */
- fmb->fmb_iov[0].iov_len = packet_nob;
- } else {
- fmb->fmb_iov[0].iov_len = PAGE_SIZE;
- nob = packet_nob - PAGE_SIZE;
-
- do {
- LASSERT (niov < fmb->fmb_npages);
- fmb->fmb_iov[niov].iov_base =
- page_address (fmb->fmb_pages[niov]);
- fmb->fmb_iov[niov].iov_len = MIN (PAGE_SIZE, nob);
- nob -= PAGE_SIZE;
- niov++;
- } while (nob > 0);
+ if (peer->ksnp_accepting > 0 ||
+ ksocknal_find_connecting_route_locked (peer) != NULL) {
+ /* the message is going to be pinned to the peer */
+ tx->tx_deadline =
+ cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
+
+ /* Queue the message until a connection is established */
+ list_add_tail(&tx->tx_list, &peer->ksnp_tx_queue);
+ write_unlock_bh(g_lock);
+ return 0;
}
- kpr_fwd_init (&fmb->fmb_fwd, dest_nid,
- packet_nob, niov, fmb->fmb_iov,
- ksocknal_fmb_callback, fmb);
+ write_unlock_bh(g_lock);
- /* stash router's descriptor ready for call to kpr_fwd_start */
- conn->ksnc_cookie = &fmb->fmb_fwd;
+ /* NB Routes may be ignored if connections to them failed recently */
+ CNETERR("No usable routes to %s\n", libcfs_id2str(id));
+ return (-EHOSTUNREACH);
+}
- conn->ksnc_rx_state = SOCKNAL_RX_BODY_FWD; /* read in the payload */
+int
+ksocknal_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
+{
+ int mpflag = 1;
+ int type = lntmsg->msg_type;
+ lnet_process_id_t target = lntmsg->msg_target;
+ unsigned int payload_niov = lntmsg->msg_niov;
+ struct kvec *payload_iov = lntmsg->msg_iov;
+ lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
+ unsigned int payload_offset = lntmsg->msg_offset;
+ unsigned int payload_nob = lntmsg->msg_len;
+ ksock_tx_t *tx;
+ int desc_size;
+ int rc;
- /* payload is desc's iov-ed buffer, but skipping the hdr */
- LASSERT (niov <= sizeof (conn->ksnc_rx_iov_space) /
- sizeof (struct iovec));
+ /* NB 'private' is different depending on what we're sending.
+ * Just ignore it... */
+
+ CDEBUG(D_NET, "sending %u bytes in %d frags to %s\n",
+ payload_nob, payload_niov, libcfs_id2str(target));
+
+ LASSERT (payload_nob == 0 || payload_niov > 0);
+ LASSERT (payload_niov <= LNET_MAX_IOV);
+ /* payload is either all vaddrs or all pages */
+ LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
+ LASSERT (!in_interrupt ());
+
+ if (payload_iov != NULL)
+ desc_size = offsetof(ksock_tx_t,
+ tx_frags.virt.iov[1 + payload_niov]);
+ else
+ desc_size = offsetof(ksock_tx_t,
+ tx_frags.paged.kiov[payload_niov]);
+
+ if (lntmsg->msg_vmflush)
+ mpflag = cfs_memory_pressure_get_and_set();
+ tx = ksocknal_alloc_tx(KSOCK_MSG_LNET, desc_size);
+ if (tx == NULL) {
+ CERROR("Can't allocate tx desc type %d size %d\n",
+ type, desc_size);
+ if (lntmsg->msg_vmflush)
+ cfs_memory_pressure_restore(mpflag);
+ return (-ENOMEM);
+ }
- conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
- conn->ksnc_rx_iov[0].iov_base =
- (void *)(((unsigned long)fmb->fmb_iov[0].iov_base) +
- sizeof (ptl_hdr_t));
- conn->ksnc_rx_iov[0].iov_len =
- fmb->fmb_iov[0].iov_len - sizeof (ptl_hdr_t);
+ tx->tx_conn = NULL; /* set when assigned a conn */
+ tx->tx_lnetmsg = lntmsg;
+
+ if (payload_iov != NULL) {
+ tx->tx_kiov = NULL;
+ tx->tx_nkiov = 0;
+ tx->tx_iov = tx->tx_frags.virt.iov;
+ tx->tx_niov = 1 +
+ lnet_extract_iov(payload_niov, &tx->tx_iov[1],
+ payload_niov, payload_iov,
+ payload_offset, payload_nob);
+ } else {
+ tx->tx_niov = 1;
+ tx->tx_iov = &tx->tx_frags.paged.iov;
+ tx->tx_kiov = tx->tx_frags.paged.kiov;
+ tx->tx_nkiov = lnet_extract_kiov(payload_niov, tx->tx_kiov,
+ payload_niov, payload_kiov,
+ payload_offset, payload_nob);
+
+ if (payload_nob >= *ksocknal_tunables.ksnd_zc_min_payload)
+ tx->tx_zc_capable = 1;
+ }
- if (niov > 1)
- memcpy(&conn->ksnc_rx_iov[1], &fmb->fmb_iov[1],
- (niov - 1) * sizeof (struct iovec));
+ tx->tx_msg.ksm_csum = 0;
+ tx->tx_msg.ksm_type = KSOCK_MSG_LNET;
+ tx->tx_msg.ksm_zc_cookies[0] = 0;
+ tx->tx_msg.ksm_zc_cookies[1] = 0;
- conn->ksnc_rx_niov = niov;
+ /* The first fragment will be set later in pro_pack */
+ rc = ksocknal_launch_packet(ni, tx, target);
+ if (!mpflag)
+ cfs_memory_pressure_restore(mpflag);
- CDEBUG (D_NET, "%p "LPX64"->"LPX64" %d reading body\n", conn,
- NTOH__u64 (conn->ksnc_hdr.src_nid), dest_nid, payload_nob);
- return (0);
+ if (rc == 0)
+ return (0);
+
+ ksocknal_free_tx(tx);
+ return (-EIO);
}
-void
-ksocknal_fwd_parse (ksock_conn_t *conn)
+int
+ksocknal_thread_start(int (*fn)(void *arg), void *arg, char *name)
{
- ksock_conn_t *conn2;
- ptl_nid_t dest_nid = NTOH__u64 (conn->ksnc_hdr.dest_nid);
- int body_len = NTOH__u32 (PTL_HDR_LENGTH(&conn->ksnc_hdr));
+ struct task_struct *task = kthread_run(fn, arg, name);
- CDEBUG (D_NET, "%p "LPX64"->"LPX64" %d parsing header\n", conn,
- NTOH__u64 (conn->ksnc_hdr.src_nid),
- dest_nid, conn->ksnc_rx_nob_left);
+ if (IS_ERR(task))
+ return PTR_ERR(task);
- LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_HEADER);
- LASSERT (conn->ksnc_rx_scheduled);
+ write_lock_bh(&ksocknal_data.ksnd_global_lock);
+ ksocknal_data.ksnd_nthreads++;
+ write_unlock_bh(&ksocknal_data.ksnd_global_lock);
+ return 0;
+}
- if (body_len < 0) { /* length corrupt (overflow) */
- CERROR("dropping packet from "LPX64" for "LPX64": packet "
- "size %d illegal\n", NTOH__u64 (conn->ksnc_hdr.src_nid),
- dest_nid, body_len);
- ksocknal_new_packet (conn, 0); /* on to new packet */
- return;
- }
+void
+ksocknal_thread_fini (void)
+{
+ write_lock_bh(&ksocknal_data.ksnd_global_lock);
+ ksocknal_data.ksnd_nthreads--;
+ write_unlock_bh(&ksocknal_data.ksnd_global_lock);
+}
- if (ksocknal_data.ksnd_fmbs == NULL) { /* not forwarding */
- CERROR("dropping packet from "LPX64" for "LPX64": not "
- "forwarding\n", conn->ksnc_hdr.src_nid,
- conn->ksnc_hdr.dest_nid);
- /* on to new packet (skip this one's body) */
- ksocknal_new_packet (conn, body_len);
- return;
- }
+int
+ksocknal_new_packet (ksock_conn_t *conn, int nob_to_skip)
+{
+ static char ksocknal_slop_buffer[4096];
- if (body_len > SOCKNAL_MAX_FWD_PAYLOAD) { /* too big to forward */
- CERROR ("dropping packet from "LPX64" for "LPX64
- ": packet size %d too big\n", conn->ksnc_hdr.src_nid,
- conn->ksnc_hdr.dest_nid, body_len);
- /* on to new packet (skip this one's body) */
- ksocknal_new_packet (conn, body_len);
- return;
- }
+ int nob;
+ unsigned int niov;
+ int skipped;
- /* should have gone direct */
- conn2 = ksocknal_get_conn (conn->ksnc_hdr.dest_nid);
- if (conn2 != NULL) {
- CERROR ("dropping packet from "LPX64" for "LPX64
- ": target is a peer\n", conn->ksnc_hdr.src_nid,
- conn->ksnc_hdr.dest_nid);
- ksocknal_put_conn (conn2); /* drop ref from get above */
+ LASSERT(conn->ksnc_proto != NULL);
- /* on to next packet (skip this one's body) */
- ksocknal_new_packet (conn, body_len);
- return;
+ if ((*ksocknal_tunables.ksnd_eager_ack & conn->ksnc_type) != 0) {
+ /* Remind the socket to ack eagerly... */
+ ksocknal_lib_eager_ack(conn);
}
- conn->ksnc_rx_state = SOCKNAL_RX_GET_FMB; /* Getting FMB now */
- conn->ksnc_rx_nob_left = body_len; /* stash packet size */
- conn->ksnc_rx_nob_wanted = body_len; /* (no slop) */
-}
+ if (nob_to_skip == 0) { /* right at next packet boundary now */
+ conn->ksnc_rx_started = 0;
+ smp_mb(); /* racing with timeout thread */
-int
-ksocknal_new_packet (ksock_conn_t *conn, int nob_to_skip)
-{
- static char ksocknal_slop_buffer[4096];
+ switch (conn->ksnc_proto->pro_version) {
+ case KSOCK_PROTO_V2:
+ case KSOCK_PROTO_V3:
+ conn->ksnc_rx_state = SOCKNAL_RX_KSM_HEADER;
+ conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
+ conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg;
+
+ conn->ksnc_rx_nob_wanted = offsetof(struct ksock_msg, ksm_u);
+ conn->ksnc_rx_nob_left = offsetof(struct ksock_msg, ksm_u);
+ conn->ksnc_rx_iov[0].iov_len = offsetof(struct ksock_msg, ksm_u);
+ break;
- int nob;
- int niov;
- int skipped;
+ case KSOCK_PROTO_V1:
+ /* Receiving bare lnet_hdr_t */
+ conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
+ conn->ksnc_rx_nob_wanted = sizeof(lnet_hdr_t);
+ conn->ksnc_rx_nob_left = sizeof(lnet_hdr_t);
- if (nob_to_skip == 0) { /* right at next packet boundary now */
- conn->ksnc_rx_state = SOCKNAL_RX_HEADER;
- conn->ksnc_rx_nob_wanted = sizeof (ptl_hdr_t);
- conn->ksnc_rx_nob_left = sizeof (ptl_hdr_t);
+ conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
+ conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
+ conn->ksnc_rx_iov[0].iov_len = sizeof (lnet_hdr_t);
+ break;
- conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
- conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_hdr;
- conn->ksnc_rx_iov[0].iov_len = sizeof (ptl_hdr_t);
+ default:
+ LBUG ();
+ }
conn->ksnc_rx_niov = 1;
conn->ksnc_rx_kiov = NULL;
conn->ksnc_rx_nkiov = 0;
+ conn->ksnc_rx_csum = ~0;
return (1);
}
- /* Set up to skip as much a possible now. If there's more left
+ /* Set up to skip as much as possible now. If there's more left
* (ran out of iov entries) we'll get called again */
conn->ksnc_rx_state = SOCKNAL_RX_SLOP;
conn->ksnc_rx_nob_left = nob_to_skip;
- conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space;
+ conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
skipped = 0;
niov = 0;
nob_to_skip -=nob;
} while (nob_to_skip != 0 && /* mustn't overflow conn's rx iov */
- niov < sizeof(conn->ksnc_rx_iov_space) / sizeof (struct iovec));
+ niov < sizeof(conn->ksnc_rx_iov_space) / sizeof(struct kvec));
conn->ksnc_rx_niov = niov;
conn->ksnc_rx_kiov = NULL;
return (0);
}
-void
-ksocknal_process_receive (ksock_sched_t *sched, long *irq_flags)
+static int
+ksocknal_process_receive (ksock_conn_t *conn)
{
- ksock_conn_t *conn;
- ksock_fmb_t *fmb;
- int rc;
+ lnet_hdr_t *lhdr;
+ lnet_process_id_t *id;
+ int rc;
- /* NB: sched->ksnc_lock lock held */
+ LASSERT (atomic_read(&conn->ksnc_conn_refcount) > 0);
- LASSERT (!list_empty (&sched->kss_rx_conns));
- conn = list_entry(sched->kss_rx_conns.next, ksock_conn_t, ksnc_rx_list);
- list_del (&conn->ksnc_rx_list);
+ /* NB: sched lock NOT held */
+ /* SOCKNAL_RX_LNET_HEADER is here for backward compatibility */
+ LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_KSM_HEADER ||
+ conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD ||
+ conn->ksnc_rx_state == SOCKNAL_RX_LNET_HEADER ||
+ conn->ksnc_rx_state == SOCKNAL_RX_SLOP);
+ again:
+ if (conn->ksnc_rx_nob_wanted != 0) {
+ rc = ksocknal_receive(conn);
+
+ if (rc <= 0) {
+ lnet_process_id_t ksnp_id = conn->ksnc_peer->ksnp_id;
+
+ LASSERT(rc != -EAGAIN);
+
+ if (rc == 0)
+ CDEBUG(D_NET, "[%p] EOF from %s "
+ "ip %pI4h:%d\n", conn,
+ libcfs_id2str(ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port);
+ else if (!conn->ksnc_closing)
+ CERROR("[%p] Error %d on read from %s "
+ "ip %pI4h:%d\n", conn, rc,
+ libcfs_id2str(ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port);
+
+ /* it's not an error if conn is being closed */
+ ksocknal_close_conn_and_siblings (conn,
+ (conn->ksnc_closing) ? 0 : rc);
+ return (rc == 0 ? -ESHUTDOWN : rc);
+ }
- spin_unlock_irqrestore (&sched->kss_lock, *irq_flags);
+ if (conn->ksnc_rx_nob_wanted != 0) {
+ /* short read */
+ return (-EAGAIN);
+ }
+ }
+ switch (conn->ksnc_rx_state) {
+ case SOCKNAL_RX_KSM_HEADER:
+ if (conn->ksnc_flip) {
+ __swab32s(&conn->ksnc_msg.ksm_type);
+ __swab32s(&conn->ksnc_msg.ksm_csum);
+ __swab64s(&conn->ksnc_msg.ksm_zc_cookies[0]);
+ __swab64s(&conn->ksnc_msg.ksm_zc_cookies[1]);
+ }
- CDEBUG(D_NET, "sched %p conn %p\n", sched, conn);
- LASSERT (atomic_read (&conn->ksnc_refcount) > 0);
- LASSERT (conn->ksnc_rx_scheduled);
- LASSERT (conn->ksnc_rx_ready);
+ if (conn->ksnc_msg.ksm_type != KSOCK_MSG_NOOP &&
+ conn->ksnc_msg.ksm_type != KSOCK_MSG_LNET) {
+ CERROR("%s: Unknown message type: %x\n",
+ libcfs_id2str(conn->ksnc_peer->ksnp_id),
+ conn->ksnc_msg.ksm_type);
+ ksocknal_new_packet(conn, 0);
+ ksocknal_close_conn_and_siblings(conn, -EPROTO);
+ return (-EPROTO);
+ }
- /* doesn't need a forwarding buffer */
- if (conn->ksnc_rx_state != SOCKNAL_RX_GET_FMB)
- goto try_read;
+ if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP &&
+ conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
+ conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
+ /* NOOP Checksum error */
+ CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
+ libcfs_id2str(conn->ksnc_peer->ksnp_id),
+ conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
+ ksocknal_new_packet(conn, 0);
+ ksocknal_close_conn_and_siblings(conn, -EPROTO);
+ return (-EIO);
+ }
- get_fmb:
- fmb = ksocknal_get_idle_fmb (conn);
- if (fmb == NULL) { /* conn descheduled waiting for idle fmb */
- spin_lock_irqsave (&sched->kss_lock, *irq_flags);
- return;
- }
+ if (conn->ksnc_msg.ksm_zc_cookies[1] != 0) {
+ __u64 cookie = 0;
- if (ksocknal_init_fmb (conn, fmb)) /* packet forwarded ? */
- goto out; /* come back later for next packet */
+ LASSERT (conn->ksnc_proto != &ksocknal_protocol_v1x);
- try_read:
- /* NB: sched lock NOT held */
- LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_HEADER ||
- conn->ksnc_rx_state == SOCKNAL_RX_BODY ||
- conn->ksnc_rx_state == SOCKNAL_RX_BODY_FWD ||
- conn->ksnc_rx_state == SOCKNAL_RX_SLOP);
+ if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP)
+ cookie = conn->ksnc_msg.ksm_zc_cookies[0];
- LASSERT (conn->ksnc_rx_nob_wanted > 0);
+ rc = conn->ksnc_proto->pro_handle_zcack(conn, cookie,
+ conn->ksnc_msg.ksm_zc_cookies[1]);
- conn->ksnc_rx_ready = 0;/* data ready may race with me and set ready */
- mb(); /* => clear BEFORE trying to read */
+ if (rc != 0) {
+ CERROR("%s: Unknown ZC-ACK cookie: %llu, %llu\n",
+ libcfs_id2str(conn->ksnc_peer->ksnp_id),
+ cookie, conn->ksnc_msg.ksm_zc_cookies[1]);
+ ksocknal_new_packet(conn, 0);
+ ksocknal_close_conn_and_siblings(conn, -EPROTO);
+ return (rc);
+ }
+ }
- rc = ksocknal_recvmsg(conn);
+ if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP) {
+ ksocknal_new_packet (conn, 0);
+ return 0; /* NOOP is done and just return */
+ }
- if (rc == 0)
- goto out;
- if (rc < 0) {
-#warning FIXME: handle socket errors properly
- CERROR ("Error socknal read %p: %d\n", conn, rc);
- goto out;
- }
+ conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
+ conn->ksnc_rx_nob_wanted = sizeof(struct ksock_lnet_msg);
+ conn->ksnc_rx_nob_left = sizeof(struct ksock_lnet_msg);
- if (conn->ksnc_rx_nob_wanted != 0) /* short read */
- goto out; /* try again later */
+ conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
+ conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg;
+ conn->ksnc_rx_iov[0].iov_len = sizeof(struct ksock_lnet_msg);
- /* got all I wanted, assume there's more - prevent data_ready locking */
- conn->ksnc_rx_ready = 1;
+ conn->ksnc_rx_niov = 1;
+ conn->ksnc_rx_kiov = NULL;
+ conn->ksnc_rx_nkiov = 0;
- switch (conn->ksnc_rx_state) {
- case SOCKNAL_RX_HEADER:
- /* It's not for me */
- if (conn->ksnc_hdr.type != PTL_MSG_HELLO &&
- NTOH__u64(conn->ksnc_hdr.dest_nid) != ksocknal_lib.ni.nid) {
- ksocknal_fwd_parse (conn);
- switch (conn->ksnc_rx_state) {
- case SOCKNAL_RX_HEADER: /* skipped (zero payload) */
- goto out; /* => come back later */
- case SOCKNAL_RX_SLOP: /* skipping packet's body */
- goto try_read; /* => go read it */
- case SOCKNAL_RX_GET_FMB: /* forwarding */
- goto get_fmb; /* => go get a fwd msg buffer */
- default:
- LBUG ();
- }
- /* Not Reached */
- }
+ goto again; /* read lnet header now */
+
+ case SOCKNAL_RX_LNET_HEADER:
+ /* unpack message header */
+ conn->ksnc_proto->pro_unpack(&conn->ksnc_msg);
- PROF_START(lib_parse);
- /* sets wanted_len, iovs etc */
- lib_parse(&ksocknal_lib, &conn->ksnc_hdr, conn);
- PROF_FINISH(lib_parse);
+ if ((conn->ksnc_peer->ksnp_id.pid & LNET_PID_USERFLAG) != 0) {
+ /* Userspace peer */
+ lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
+ id = &conn->ksnc_peer->ksnp_id;
- if (conn->ksnc_rx_nob_wanted != 0) { /* need to get payload? */
- conn->ksnc_rx_state = SOCKNAL_RX_BODY;
- goto try_read; /* go read the payload */
+ /* Substitute process ID assigned at connection time */
+ lhdr->src_pid = cpu_to_le32(id->pid);
+ lhdr->src_nid = cpu_to_le64(id->nid);
}
- /* Fall through (completed packet for me) */
- case SOCKNAL_RX_BODY:
- atomic_inc (&ksocknal_packets_received);
- /* packet is done now */
- lib_finalize(&ksocknal_lib, NULL, conn->ksnc_cookie);
- /* Fall through */
+ conn->ksnc_rx_state = SOCKNAL_RX_PARSE;
+ ksocknal_conn_addref(conn); /* ++ref while parsing */
+
+ rc = lnet_parse(conn->ksnc_peer->ksnp_ni,
+ &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr,
+ conn->ksnc_peer->ksnp_id.nid, conn, 0);
+ if (rc < 0) {
+ /* I just received garbage: give up on this conn */
+ ksocknal_new_packet(conn, 0);
+ ksocknal_close_conn_and_siblings (conn, rc);
+ ksocknal_conn_decref(conn);
+ return (-EPROTO);
+ }
- case SOCKNAL_RX_SLOP:
- /* starting new packet? */
- if (ksocknal_new_packet (conn, conn->ksnc_rx_nob_left))
- goto out; /* come back later */
- goto try_read; /* try to finish reading slop now */
+ /* I'm racing with ksocknal_recv() */
+ LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_PARSE ||
+ conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD);
+
+ if (conn->ksnc_rx_state != SOCKNAL_RX_LNET_PAYLOAD)
+ return 0;
+
+ /* ksocknal_recv() got called */
+ goto again;
+
+ case SOCKNAL_RX_LNET_PAYLOAD:
+ /* payload all received */
+ rc = 0;
+
+ if (conn->ksnc_rx_nob_left == 0 && /* not truncating */
+ conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
+ conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
+ CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
+ libcfs_id2str(conn->ksnc_peer->ksnp_id),
+ conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
+ rc = -EIO;
+ }
- case SOCKNAL_RX_BODY_FWD:
- CDEBUG (D_NET, "%p "LPX64"->"LPX64" %d fwd_start (got body)\n",
- conn, NTOH__u64 (conn->ksnc_hdr.src_nid),
- NTOH__u64 (conn->ksnc_hdr.dest_nid),
- conn->ksnc_rx_nob_left);
+ if (rc == 0 && conn->ksnc_msg.ksm_zc_cookies[0] != 0) {
+ LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x);
- atomic_inc (&ksocknal_packets_received);
+ lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
+ id = &conn->ksnc_peer->ksnp_id;
- /* ksocknal_init_fmb() put router desc. in conn->ksnc_cookie */
- kpr_fwd_start (&ksocknal_data.ksnd_router,
- (kpr_fwd_desc_t *)conn->ksnc_cookie);
+ rc = conn->ksnc_proto->pro_handle_zcreq(conn,
+ conn->ksnc_msg.ksm_zc_cookies[0],
+ *ksocknal_tunables.ksnd_nonblk_zcack ||
+ le64_to_cpu(lhdr->src_nid) != id->nid);
+ }
- /* no slop in forwarded packets */
- LASSERT (conn->ksnc_rx_nob_left == 0);
+ lnet_finalize(conn->ksnc_peer->ksnp_ni, conn->ksnc_cookie, rc);
- ksocknal_new_packet (conn, 0); /* on to next packet */
- goto out; /* (later) */
+ if (rc != 0) {
+ ksocknal_new_packet(conn, 0);
+ ksocknal_close_conn_and_siblings (conn, rc);
+ return (-EPROTO);
+ }
+ /* Fall through */
+
+ case SOCKNAL_RX_SLOP:
+ /* starting new packet? */
+ if (ksocknal_new_packet (conn, conn->ksnc_rx_nob_left))
+ return 0; /* come back later */
+ goto again; /* try to finish reading slop now */
default:
+ break;
}
/* Not Reached */
LBUG ();
-
- out:
- spin_lock_irqsave (&sched->kss_lock, *irq_flags);
-
- /* no data there to read? */
- if (!conn->ksnc_rx_ready) {
- /* let socket callback schedule again */
- conn->ksnc_rx_scheduled = 0;
- ksocknal_put_conn (conn); /* release scheduler's ref */
- } else /* let scheduler call me again */
- list_add_tail (&conn->ksnc_rx_list, &sched->kss_rx_conns);
+ return (-EINVAL); /* keep gcc happy */
}
int
-ksocknal_recv (nal_cb_t *nal, void *private, lib_msg_t *msg,
- unsigned int niov, struct iovec *iov, size_t mlen, size_t rlen)
+ksocknal_recv (lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed,
+ unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
+ unsigned int offset, unsigned int mlen, unsigned int rlen)
{
- ksock_conn_t *conn = (ksock_conn_t *)private;
+ ksock_conn_t *conn = (ksock_conn_t *)private;
+ ksock_sched_t *sched = conn->ksnc_scheduler;
LASSERT (mlen <= rlen);
- LASSERT (niov <= PTL_MD_MAX_IOV);
-
+ LASSERT (niov <= LNET_MAX_IOV);
+
conn->ksnc_cookie = msg;
conn->ksnc_rx_nob_wanted = mlen;
conn->ksnc_rx_nob_left = rlen;
- conn->ksnc_rx_nkiov = 0;
- conn->ksnc_rx_kiov = NULL;
- conn->ksnc_rx_niov = niov;
- conn->ksnc_rx_iov = conn->ksnc_rx_iov_space.iov;
- memcpy (conn->ksnc_rx_iov, iov, niov * sizeof (*iov));
+ if (mlen == 0 || iov != NULL) {
+ conn->ksnc_rx_nkiov = 0;
+ conn->ksnc_rx_kiov = NULL;
+ conn->ksnc_rx_iov = conn->ksnc_rx_iov_space.iov;
+ conn->ksnc_rx_niov =
+ lnet_extract_iov(LNET_MAX_IOV, conn->ksnc_rx_iov,
+ niov, iov, offset, mlen);
+ } else {
+ conn->ksnc_rx_niov = 0;
+ conn->ksnc_rx_iov = NULL;
+ conn->ksnc_rx_kiov = conn->ksnc_rx_iov_space.kiov;
+ conn->ksnc_rx_nkiov =
+ lnet_extract_kiov(LNET_MAX_IOV, conn->ksnc_rx_kiov,
+ niov, kiov, offset, mlen);
+ }
+
+ LASSERT (mlen ==
+ lnet_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) +
+ lnet_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov));
+
+ LASSERT (conn->ksnc_rx_scheduled);
+
+ spin_lock_bh(&sched->kss_lock);
+
+ switch (conn->ksnc_rx_state) {
+ case SOCKNAL_RX_PARSE_WAIT:
+ list_add_tail(&conn->ksnc_rx_list, &sched->kss_rx_conns);
+ wake_up(&sched->kss_waitq);
+ LASSERT(conn->ksnc_rx_ready);
+ break;
- LASSERT (mlen ==
- lib_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) +
- lib_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov));
+ case SOCKNAL_RX_PARSE:
+ /* scheduler hasn't noticed I'm parsing yet */
+ break;
+ }
+
+ conn->ksnc_rx_state = SOCKNAL_RX_LNET_PAYLOAD;
- return (rlen);
+ spin_unlock_bh(&sched->kss_lock);
+ ksocknal_conn_decref(conn);
+ return 0;
}
-int
-ksocknal_recv_pages (nal_cb_t *nal, void *private, lib_msg_t *msg,
- unsigned int niov, ptl_kiov_t *kiov, size_t mlen, size_t rlen)
+static inline int
+ksocknal_sched_cansleep(ksock_sched_t *sched)
{
- ksock_conn_t *conn = (ksock_conn_t *)private;
+ int rc;
- LASSERT (mlen <= rlen);
- LASSERT (niov <= PTL_MD_MAX_IOV);
-
- conn->ksnc_cookie = msg;
- conn->ksnc_rx_nob_wanted = mlen;
- conn->ksnc_rx_nob_left = rlen;
-
- conn->ksnc_rx_niov = 0;
- conn->ksnc_rx_iov = NULL;
- conn->ksnc_rx_nkiov = niov;
- conn->ksnc_rx_kiov = conn->ksnc_rx_iov_space.kiov;
- memcpy (conn->ksnc_rx_kiov, kiov, niov * sizeof (*kiov));
+ spin_lock_bh(&sched->kss_lock);
- LASSERT (mlen ==
- lib_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) +
- lib_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov));
+ rc = (!ksocknal_data.ksnd_shuttingdown &&
+ list_empty(&sched->kss_rx_conns) &&
+ list_empty(&sched->kss_tx_conns));
- return (rlen);
+ spin_unlock_bh(&sched->kss_lock);
+ return rc;
}
-int ksocknal_scheduler (void *arg)
+int ksocknal_scheduler(void *arg)
{
- ksock_sched_t *sched = (ksock_sched_t *)arg;
- unsigned long flags;
- int rc;
- int nloops = 0;
- int id = sched - ksocknal_data.ksnd_schedulers;
- char name[16];
-#if (CONFIG_SMP && CPU_AFFINITY)
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
- int cpu = cpu_logical_map(id % num_online_cpus());
-#else
-#warning "Take care of architecure specific logical APIC map"
- int cpu = 1; /* Have to change later. */
-#endif /* LINUX_VERSION_CODE */
-
- set_cpus_allowed (current, 1 << cpu);
- id = cpu;
-#endif /* CONFIG_SMP && CPU_AFFINITY */
-
- snprintf (name, sizeof (name),"ksocknald[%d]", id);
- kportal_daemonize (name);
- kportal_blockallsigs ();
-
- spin_lock_irqsave (&sched->kss_lock, flags);
+ struct ksock_sched_info *info;
+ ksock_sched_t *sched;
+ ksock_conn_t *conn;
+ ksock_tx_t *tx;
+ int rc;
+ int nloops = 0;
+ long id = (long)arg;
+
+ info = ksocknal_data.ksnd_sched_info[KSOCK_THREAD_CPT(id)];
+ sched = &info->ksi_scheds[KSOCK_THREAD_SID(id)];
+
+ cfs_block_allsigs();
+
+ rc = cfs_cpt_bind(lnet_cpt_table(), info->ksi_cpt);
+ if (rc != 0) {
+ CWARN("Can't set CPU partition affinity to %d: %d\n",
+ info->ksi_cpt, rc);
+ }
+
+ spin_lock_bh(&sched->kss_lock);
while (!ksocknal_data.ksnd_shuttingdown) {
int did_something = 0;
/* Ensure I progress everything semi-fairly */
- if (!list_empty (&sched->kss_rx_conns)) {
- did_something = 1;
- /* drops & regains kss_lock */
- ksocknal_process_receive (sched, &flags);
- }
+ if (!list_empty(&sched->kss_rx_conns)) {
+ conn = list_entry(sched->kss_rx_conns.next,
+ ksock_conn_t, ksnc_rx_list);
+ list_del(&conn->ksnc_rx_list);
+
+ LASSERT(conn->ksnc_rx_scheduled);
+ LASSERT(conn->ksnc_rx_ready);
+
+ /* clear rx_ready in case receive isn't complete.
+ * Do it BEFORE we call process_recv, since
+ * data_ready can set it any time after we release
+ * kss_lock. */
+ conn->ksnc_rx_ready = 0;
+ spin_unlock_bh(&sched->kss_lock);
+
+ rc = ksocknal_process_receive(conn);
+
+ spin_lock_bh(&sched->kss_lock);
+
+ /* I'm the only one that can clear this flag */
+ LASSERT(conn->ksnc_rx_scheduled);
+
+ /* Did process_receive get everything it wanted? */
+ if (rc == 0)
+ conn->ksnc_rx_ready = 1;
+
+ if (conn->ksnc_rx_state == SOCKNAL_RX_PARSE) {
+ /* Conn blocked waiting for ksocknal_recv()
+ * I change its state (under lock) to signal
+ * it can be rescheduled */
+ conn->ksnc_rx_state = SOCKNAL_RX_PARSE_WAIT;
+ } else if (conn->ksnc_rx_ready) {
+ /* reschedule for rx */
+ list_add_tail(&conn->ksnc_rx_list,
+ &sched->kss_rx_conns);
+ } else {
+ conn->ksnc_rx_scheduled = 0;
+ /* drop my ref */
+ ksocknal_conn_decref(conn);
+ }
- if (!list_empty (&sched->kss_tx_conns)) {
did_something = 1;
- /* drops and regains kss_lock */
- ksocknal_process_transmit (sched, &flags);
}
-#if SOCKNAL_ZC
- if (!list_empty (&sched->kss_zctxdone_list)) {
- ksock_tx_t *tx =
- list_entry(sched->kss_zctxdone_list.next,
- ksock_tx_t, tx_list);
- did_something = 1;
- list_del (&tx->tx_list);
- spin_unlock_irqrestore (&sched->kss_lock, flags);
+ if (!list_empty(&sched->kss_tx_conns)) {
+ struct list_head zlist = LIST_HEAD_INIT(zlist);
- ksocknal_tx_done (tx);
+ if (!list_empty(&sched->kss_zombie_noop_txs)) {
+ list_add(&zlist,
+ &sched->kss_zombie_noop_txs);
+ list_del_init(&sched->kss_zombie_noop_txs);
+ }
+
+ conn = list_entry(sched->kss_tx_conns.next,
+ ksock_conn_t, ksnc_tx_list);
+ list_del(&conn->ksnc_tx_list);
+
+ LASSERT(conn->ksnc_tx_scheduled);
+ LASSERT(conn->ksnc_tx_ready);
+ LASSERT(!list_empty(&conn->ksnc_tx_queue));
+
+ tx = list_entry(conn->ksnc_tx_queue.next,
+ ksock_tx_t, tx_list);
+
+ if (conn->ksnc_tx_carrier == tx)
+ ksocknal_next_tx_carrier(conn);
+
+ /* dequeue now so empty list => more to send */
+ list_del(&tx->tx_list);
+
+ /* Clear tx_ready in case send isn't complete. Do
+ * it BEFORE we call process_transmit, since
+ * write_space can set it any time after we release
+ * kss_lock. */
+ conn->ksnc_tx_ready = 0;
+ spin_unlock_bh(&sched->kss_lock);
+
+ if (!list_empty(&zlist)) {
+ /* free zombie noop txs, it's fast because
+ * noop txs are just put in freelist */
+ ksocknal_txlist_done(NULL, &zlist, 0);
+ }
+
+ rc = ksocknal_process_transmit(conn, tx);
+
+ if (rc == -ENOMEM || rc == -EAGAIN) {
+ /* Incomplete send: replace tx on HEAD of tx_queue */
+ spin_lock_bh(&sched->kss_lock);
+ list_add(&tx->tx_list,
+ &conn->ksnc_tx_queue);
+ } else {
+ /* Complete send; tx -ref */
+ ksocknal_tx_decref(tx);
+
+ spin_lock_bh(&sched->kss_lock);
+ /* assume space for more */
+ conn->ksnc_tx_ready = 1;
+ }
- spin_lock_irqsave (&sched->kss_lock, flags);
+ if (rc == -ENOMEM) {
+ /* Do nothing; after a short timeout, this
+ * conn will be reposted on kss_tx_conns. */
+ } else if (conn->ksnc_tx_ready &&
+ !list_empty(&conn->ksnc_tx_queue)) {
+ /* reschedule for tx */
+ list_add_tail(&conn->ksnc_tx_list,
+ &sched->kss_tx_conns);
+ } else {
+ conn->ksnc_tx_scheduled = 0;
+ /* drop my ref */
+ ksocknal_conn_decref(conn);
+ }
+
+ did_something = 1;
}
-#endif
if (!did_something || /* nothing to do */
++nloops == SOCKNAL_RESCHED) { /* hogging CPU? */
- spin_unlock_irqrestore (&sched->kss_lock, flags);
+ spin_unlock_bh(&sched->kss_lock);
nloops = 0;
if (!did_something) { /* wait for something to do */
-#if SOCKNAL_ZC
- rc = wait_event_interruptible (sched->kss_waitq,
- ksocknal_data.ksnd_shuttingdown ||
- !list_empty(&sched->kss_rx_conns) ||
- !list_empty(&sched->kss_tx_conns) ||
- !list_empty(&sched->kss_zctxdone_list));
-#else
- rc = wait_event_interruptible (sched->kss_waitq,
- ksocknal_data.ksnd_shuttingdown ||
- !list_empty(&sched->kss_rx_conns) ||
- !list_empty(&sched->kss_tx_conns));
+ rc = wait_event_interruptible_exclusive(
+ sched->kss_waitq,
+ !ksocknal_sched_cansleep(sched));
+ LASSERT (rc == 0);
+ } else {
+ cond_resched();
+ }
+
+ spin_lock_bh(&sched->kss_lock);
+ }
+ }
+
+ spin_unlock_bh(&sched->kss_lock);
+ ksocknal_thread_fini();
+ return 0;
+}
+
+/*
+ * Add connection to kss_rx_conns of scheduler
+ * and wakeup the scheduler.
+ */
+void ksocknal_read_callback (ksock_conn_t *conn)
+{
+ ksock_sched_t *sched;
+ ENTRY;
+
+ sched = conn->ksnc_scheduler;
+
+ spin_lock_bh(&sched->kss_lock);
+
+ conn->ksnc_rx_ready = 1;
+
+ if (!conn->ksnc_rx_scheduled) { /* not being progressed */
+ list_add_tail(&conn->ksnc_rx_list,
+ &sched->kss_rx_conns);
+ conn->ksnc_rx_scheduled = 1;
+ /* extra ref for scheduler */
+ ksocknal_conn_addref(conn);
+
+ wake_up (&sched->kss_waitq);
+ }
+ spin_unlock_bh(&sched->kss_lock);
+
+ EXIT;
+}
+
+/*
+ * Add connection to kss_tx_conns of scheduler
+ * and wakeup the scheduler.
+ */
+void ksocknal_write_callback(ksock_conn_t *conn)
+{
+ ksock_sched_t *sched;
+ ENTRY;
+
+ sched = conn->ksnc_scheduler;
+
+ spin_lock_bh(&sched->kss_lock);
+
+ conn->ksnc_tx_ready = 1;
+
+ if (!conn->ksnc_tx_scheduled && /* not being progressed */
+ !list_empty(&conn->ksnc_tx_queue)) { /* packets to send */
+ list_add_tail(&conn->ksnc_tx_list, &sched->kss_tx_conns);
+ conn->ksnc_tx_scheduled = 1;
+ /* extra ref for scheduler */
+ ksocknal_conn_addref(conn);
+
+ wake_up(&sched->kss_waitq);
+ }
+
+ spin_unlock_bh(&sched->kss_lock);
+
+ EXIT;
+}
+
+static ksock_proto_t *
+ksocknal_parse_proto_version (struct ksock_hello_msg *hello)
+{
+ __u32 version = 0;
+
+ if (hello->kshm_magic == LNET_PROTO_MAGIC)
+ version = hello->kshm_version;
+ else if (hello->kshm_magic == __swab32(LNET_PROTO_MAGIC))
+ version = __swab32(hello->kshm_version);
+
+ if (version != 0) {
+#if SOCKNAL_VERSION_DEBUG
+ if (*ksocknal_tunables.ksnd_protocol == 1)
+ return NULL;
+
+ if (*ksocknal_tunables.ksnd_protocol == 2 &&
+ version == KSOCK_PROTO_V3)
+ return NULL;
#endif
- LASSERT (rc == 0);
- } else
- our_cond_resched();
+ if (version == KSOCK_PROTO_V2)
+ return &ksocknal_protocol_v2x;
- spin_lock_irqsave (&sched->kss_lock, flags);
- }
+ if (version == KSOCK_PROTO_V3)
+ return &ksocknal_protocol_v3x;
+
+ return NULL;
}
- spin_unlock_irqrestore (&sched->kss_lock, flags);
- ksocknal_thread_fini ();
- return (0);
+ if (hello->kshm_magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
+ lnet_magicversion_t *hmv = (lnet_magicversion_t *)hello;
+
+ CLASSERT (sizeof (lnet_magicversion_t) ==
+ offsetof (struct ksock_hello_msg, kshm_src_nid));
+
+ if (hmv->version_major == cpu_to_le16 (KSOCK_PROTO_V1_MAJOR) &&
+ hmv->version_minor == cpu_to_le16 (KSOCK_PROTO_V1_MINOR))
+ return &ksocknal_protocol_v1x;
+ }
+
+ return NULL;
}
-void
-ksocknal_data_ready (struct sock *sk, int n)
+int
+ksocknal_send_hello (lnet_ni_t *ni, ksock_conn_t *conn,
+ lnet_nid_t peer_nid, struct ksock_hello_msg *hello)
{
- unsigned long flags;
- ksock_conn_t *conn;
- ksock_sched_t *sched;
- ENTRY;
+ /* CAVEAT EMPTOR: this byte flips 'ipaddrs' */
+ ksock_net_t *net = (ksock_net_t *)ni->ni_data;
- /* interleave correctly with closing sockets... */
- read_lock (&ksocknal_data.ksnd_socklist_lock);
+ LASSERT (hello->kshm_nips <= LNET_MAX_INTERFACES);
- conn = sk->user_data;
- if (conn == NULL) { /* raced with ksocknal_close_sock */
- LASSERT (sk->data_ready != &ksocknal_data_ready);
- sk->data_ready (sk, n);
- } else if (!conn->ksnc_rx_ready) { /* new news */
- /* Set ASAP in case of concurrent calls to me */
- conn->ksnc_rx_ready = 1;
+ /* rely on caller to hold a ref on socket so it wouldn't disappear */
+ LASSERT (conn->ksnc_proto != NULL);
- sched = conn->ksnc_scheduler;
+ hello->kshm_src_nid = ni->ni_nid;
+ hello->kshm_dst_nid = peer_nid;
+ hello->kshm_src_pid = the_lnet.ln_pid;
+
+ hello->kshm_src_incarnation = net->ksnn_incarnation;
+ hello->kshm_ctype = conn->ksnc_type;
+
+ return conn->ksnc_proto->pro_send_hello(conn, hello);
+}
+
+static int
+ksocknal_invert_type(int type)
+{
+ switch (type)
+ {
+ case SOCKLND_CONN_ANY:
+ case SOCKLND_CONN_CONTROL:
+ return (type);
+ case SOCKLND_CONN_BULK_IN:
+ return SOCKLND_CONN_BULK_OUT;
+ case SOCKLND_CONN_BULK_OUT:
+ return SOCKLND_CONN_BULK_IN;
+ default:
+ return (SOCKLND_CONN_NONE);
+ }
+}
- spin_lock_irqsave (&sched->kss_lock, flags);
+int
+ksocknal_recv_hello(lnet_ni_t *ni, ksock_conn_t *conn,
+ struct ksock_hello_msg *hello, lnet_process_id_t *peerid,
+ __u64 *incarnation)
+{
+ /* Return < 0 fatal error
+ * 0 success
+ * EALREADY lost connection race
+ * EPROTO protocol version mismatch
+ */
+ struct socket *sock = conn->ksnc_sock;
+ int active = (conn->ksnc_proto != NULL);
+ int timeout;
+ int proto_match;
+ int rc;
+ ksock_proto_t *proto;
+ lnet_process_id_t recv_id;
+
+ /* socket type set on active connections - not set on passive */
+ LASSERT(!active == !(conn->ksnc_type != SOCKLND_CONN_NONE));
+
+ timeout = active ? *ksocknal_tunables.ksnd_timeout :
+ lnet_acceptor_timeout();
+
+ rc = lnet_sock_read(sock, &hello->kshm_magic,
+ sizeof(hello->kshm_magic), timeout);
+ if (rc != 0) {
+ CERROR("Error %d reading HELLO from %pI4h\n",
+ rc, &conn->ksnc_ipaddr);
+ LASSERT (rc < 0);
+ return rc;
+ }
- /* Set again (process_receive may have cleared while I blocked for the lock) */
- conn->ksnc_rx_ready = 1;
+ if (hello->kshm_magic != LNET_PROTO_MAGIC &&
+ hello->kshm_magic != __swab32(LNET_PROTO_MAGIC) &&
+ hello->kshm_magic != le32_to_cpu (LNET_PROTO_TCP_MAGIC)) {
+ /* Unexpected magic! */
+ CERROR ("Bad magic(1) %#08x (%#08x expected) from "
+ "%pI4h\n", __cpu_to_le32 (hello->kshm_magic),
+ LNET_PROTO_TCP_MAGIC, &conn->ksnc_ipaddr);
+ return -EPROTO;
+ }
- if (!conn->ksnc_rx_scheduled) { /* not being progressed */
- list_add_tail(&conn->ksnc_rx_list,
- &sched->kss_rx_conns);
- conn->ksnc_rx_scheduled = 1;
- /* extra ref for scheduler */
- atomic_inc (&conn->ksnc_refcount);
+ rc = lnet_sock_read(sock, &hello->kshm_version,
+ sizeof(hello->kshm_version), timeout);
+ if (rc != 0) {
+ CERROR("Error %d reading HELLO from %pI4h\n",
+ rc, &conn->ksnc_ipaddr);
+ LASSERT(rc < 0);
+ return rc;
+ }
- if (waitqueue_active (&sched->kss_waitq))
- wake_up (&sched->kss_waitq);
+ proto = ksocknal_parse_proto_version(hello);
+ if (proto == NULL) {
+ if (!active) {
+ /* unknown protocol from peer, tell peer my protocol */
+ conn->ksnc_proto = &ksocknal_protocol_v3x;
+#if SOCKNAL_VERSION_DEBUG
+ if (*ksocknal_tunables.ksnd_protocol == 2)
+ conn->ksnc_proto = &ksocknal_protocol_v2x;
+ else if (*ksocknal_tunables.ksnd_protocol == 1)
+ conn->ksnc_proto = &ksocknal_protocol_v1x;
+#endif
+ hello->kshm_nips = 0;
+ ksocknal_send_hello(ni, conn, ni->ni_nid, hello);
}
- spin_unlock_irqrestore (&sched->kss_lock, flags);
+ CERROR("Unknown protocol version (%d.x expected) from %pI4h\n",
+ conn->ksnc_proto->pro_version, &conn->ksnc_ipaddr);
+
+ return -EPROTO;
}
- read_unlock (&ksocknal_data.ksnd_socklist_lock);
+ proto_match = (conn->ksnc_proto == proto);
+ conn->ksnc_proto = proto;
- EXIT;
+ /* receive the rest of hello message anyway */
+ rc = conn->ksnc_proto->pro_recv_hello(conn, hello, timeout);
+ if (rc != 0) {
+ CERROR("Error %d reading or checking hello from from %pI4h\n",
+ rc, &conn->ksnc_ipaddr);
+ LASSERT (rc < 0);
+ return rc;
+ }
+
+ *incarnation = hello->kshm_src_incarnation;
+
+ if (hello->kshm_src_nid == LNET_NID_ANY) {
+ CERROR("Expecting a HELLO hdr with a NID, but got LNET_NID_ANY"
+ "from %pI4h\n", &conn->ksnc_ipaddr);
+ return -EPROTO;
+ }
+
+ if (!active &&
+ conn->ksnc_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) {
+ /* Userspace NAL assigns peer process ID from socket */
+ recv_id.pid = conn->ksnc_port | LNET_PID_USERFLAG;
+ recv_id.nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), conn->ksnc_ipaddr);
+ } else {
+ recv_id.nid = hello->kshm_src_nid;
+ recv_id.pid = hello->kshm_src_pid;
+ }
+
+ if (!active) {
+ *peerid = recv_id;
+
+ /* peer determines type */
+ conn->ksnc_type = ksocknal_invert_type(hello->kshm_ctype);
+ if (conn->ksnc_type == SOCKLND_CONN_NONE) {
+ CERROR("Unexpected type %d from %s ip %pI4h\n",
+ hello->kshm_ctype, libcfs_id2str(*peerid),
+ &conn->ksnc_ipaddr);
+ return -EPROTO;
+ }
+ return 0;
+ }
+
+ if (peerid->pid != recv_id.pid ||
+ peerid->nid != recv_id.nid) {
+ LCONSOLE_ERROR_MSG(0x130, "Connected successfully to %s on host"
+ " %pI4h, but they claimed they were "
+ "%s; please check your Lustre "
+ "configuration.\n",
+ libcfs_id2str(*peerid),
+ &conn->ksnc_ipaddr,
+ libcfs_id2str(recv_id));
+ return -EPROTO;
+ }
+
+ if (hello->kshm_ctype == SOCKLND_CONN_NONE) {
+ /* Possible protocol mismatch or I lost the connection race */
+ return proto_match ? EALREADY : EPROTO;
+ }
+
+ if (ksocknal_invert_type(hello->kshm_ctype) != conn->ksnc_type) {
+ CERROR("Mismatched types: me %d, %s ip %pI4h %d\n",
+ conn->ksnc_type, libcfs_id2str(*peerid),
+ &conn->ksnc_ipaddr,
+ hello->kshm_ctype);
+ return -EPROTO;
+ }
+ return 0;
}
-void
-ksocknal_write_space (struct sock *sk)
+static int
+ksocknal_connect (ksock_route_t *route)
{
- unsigned long flags;
- ksock_conn_t *conn;
- ksock_sched_t *sched;
-
- /* interleave correctly with closing sockets... */
- read_lock (&ksocknal_data.ksnd_socklist_lock);
-
- conn = sk->user_data;
-
- CDEBUG(D_NET, "sk %p wspace %d low water %d conn %p%s%s%s\n",
- sk, tcp_wspace(sk), SOCKNAL_TX_LOW_WATER(sk), conn,
- (conn == NULL) ? "" : (test_bit (0, &conn->ksnc_tx_ready) ?
- " ready" : " blocked"),
- (conn == NULL) ? "" : (conn->ksnc_tx_scheduled ?
- " scheduled" : " idle"),
- (conn == NULL) ? "" : (list_empty (&conn->ksnc_tx_queue) ?
- " empty" : " queued"));
-
- if (conn == NULL) { /* raced with ksocknal_close_sock */
- LASSERT (sk->write_space != &ksocknal_write_space);
- sk->write_space (sk);
- } else if (tcp_wspace(sk) >= SOCKNAL_TX_LOW_WATER(sk)) { /* got enough space */
- clear_bit (SOCK_NOSPACE, &sk->socket->flags);
-
- if (!conn->ksnc_tx_ready) { /* new news */
- /* Set ASAP in case of concurrent calls to me */
- conn->ksnc_tx_ready = 1;
+ struct list_head zombies = LIST_HEAD_INIT(zombies);
+ ksock_peer_t *peer = route->ksnr_peer;
+ int type;
+ int wanted;
+ struct socket *sock;
+ cfs_time_t deadline;
+ int retry_later = 0;
+ int rc = 0;
- sched = conn->ksnc_scheduler;
+ deadline = cfs_time_add(cfs_time_current(),
+ cfs_time_seconds(*ksocknal_tunables.ksnd_timeout));
- spin_lock_irqsave (&sched->kss_lock, flags);
+ write_lock_bh(&ksocknal_data.ksnd_global_lock);
- /* Set again (process_transmit may have
- cleared while I blocked for the lock) */
- conn->ksnc_tx_ready = 1;
+ LASSERT (route->ksnr_scheduled);
+ LASSERT (!route->ksnr_connecting);
- if (!conn->ksnc_tx_scheduled && // not being progressed
- !list_empty(&conn->ksnc_tx_queue)){//packets to send
- list_add_tail (&conn->ksnc_tx_list,
- &sched->kss_tx_conns);
- conn->ksnc_tx_scheduled = 1;
- /* extra ref for scheduler */
- atomic_inc (&conn->ksnc_refcount);
+ route->ksnr_connecting = 1;
- if (waitqueue_active (&sched->kss_waitq))
- wake_up (&sched->kss_waitq);
- }
+ for (;;) {
+ wanted = ksocknal_route_mask() & ~route->ksnr_connected;
+
+ /* stop connecting if peer/route got closed under me, or
+ * route got connected while queued */
+ if (peer->ksnp_closing || route->ksnr_deleted ||
+ wanted == 0) {
+ retry_later = 0;
+ break;
+ }
- spin_unlock_irqrestore (&sched->kss_lock, flags);
+ /* reschedule if peer is connecting to me */
+ if (peer->ksnp_accepting > 0) {
+ CDEBUG(D_NET,
+ "peer %s(%d) already connecting to me, retry later.\n",
+ libcfs_nid2str(peer->ksnp_id.nid), peer->ksnp_accepting);
+ retry_later = 1;
}
+
+ if (retry_later) /* needs reschedule */
+ break;
+
+ if ((wanted & (1 << SOCKLND_CONN_ANY)) != 0) {
+ type = SOCKLND_CONN_ANY;
+ } else if ((wanted & (1 << SOCKLND_CONN_CONTROL)) != 0) {
+ type = SOCKLND_CONN_CONTROL;
+ } else if ((wanted & (1 << SOCKLND_CONN_BULK_IN)) != 0) {
+ type = SOCKLND_CONN_BULK_IN;
+ } else {
+ LASSERT ((wanted & (1 << SOCKLND_CONN_BULK_OUT)) != 0);
+ type = SOCKLND_CONN_BULK_OUT;
+ }
+
+ write_unlock_bh(&ksocknal_data.ksnd_global_lock);
+
+ if (cfs_time_aftereq(cfs_time_current(), deadline)) {
+ rc = -ETIMEDOUT;
+ lnet_connect_console_error(rc, peer->ksnp_id.nid,
+ route->ksnr_ipaddr,
+ route->ksnr_port);
+ goto failed;
+ }
+
+ rc = lnet_connect(&sock, peer->ksnp_id.nid,
+ route->ksnr_myipaddr,
+ route->ksnr_ipaddr, route->ksnr_port);
+ if (rc != 0)
+ goto failed;
+
+ rc = ksocknal_create_conn(peer->ksnp_ni, route, sock, type);
+ if (rc < 0) {
+ lnet_connect_console_error(rc, peer->ksnp_id.nid,
+ route->ksnr_ipaddr,
+ route->ksnr_port);
+ goto failed;
+ }
+
+ /* A +ve RC means I have to retry because I lost the connection
+ * race or I have to renegotiate protocol version */
+ retry_later = (rc != 0);
+ if (retry_later)
+ CDEBUG(D_NET, "peer %s: conn race, retry later.\n",
+ libcfs_nid2str(peer->ksnp_id.nid));
+
+ write_lock_bh(&ksocknal_data.ksnd_global_lock);
}
- read_unlock (&ksocknal_data.ksnd_socklist_lock);
+ route->ksnr_scheduled = 0;
+ route->ksnr_connecting = 0;
+
+ if (retry_later) {
+ /* re-queue for attention; this frees me up to handle
+ * the peer's incoming connection request */
+
+ if (rc == EALREADY ||
+ (rc == 0 && peer->ksnp_accepting > 0)) {
+ /* We want to introduce a delay before next
+ * attempt to connect if we lost conn race,
+ * but the race is resolved quickly usually,
+ * so min_reconnectms should be good heuristic */
+ route->ksnr_retry_interval =
+ cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000;
+ route->ksnr_timeout = cfs_time_add(cfs_time_current(),
+ route->ksnr_retry_interval);
+ }
+
+ ksocknal_launch_connection_locked(route);
+ }
+
+ write_unlock_bh(&ksocknal_data.ksnd_global_lock);
+ return retry_later;
+
+ failed:
+ write_lock_bh(&ksocknal_data.ksnd_global_lock);
+
+ route->ksnr_scheduled = 0;
+ route->ksnr_connecting = 0;
+
+ /* This is a retry rather than a new connection */
+ route->ksnr_retry_interval *= 2;
+ route->ksnr_retry_interval =
+ MAX(route->ksnr_retry_interval,
+ cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000);
+ route->ksnr_retry_interval =
+ MIN(route->ksnr_retry_interval,
+ cfs_time_seconds(*ksocknal_tunables.ksnd_max_reconnectms)/1000);
+
+ LASSERT (route->ksnr_retry_interval != 0);
+ route->ksnr_timeout = cfs_time_add(cfs_time_current(),
+ route->ksnr_retry_interval);
+
+ if (!list_empty(&peer->ksnp_tx_queue) &&
+ peer->ksnp_accepting == 0 &&
+ ksocknal_find_connecting_route_locked(peer) == NULL) {
+ ksock_conn_t *conn;
+
+ /* ksnp_tx_queue is queued on a conn on successful
+ * connection for V1.x and V2.x */
+ if (!list_empty(&peer->ksnp_conns)) {
+ conn = list_entry(peer->ksnp_conns.next,
+ ksock_conn_t, ksnc_list);
+ LASSERT (conn->ksnc_proto == &ksocknal_protocol_v3x);
+ }
+
+ /* take all the blocked packets while I've got the lock and
+ * complete below... */
+ list_splice_init(&peer->ksnp_tx_queue, &zombies);
+ }
+
+ write_unlock_bh(&ksocknal_data.ksnd_global_lock);
+
+ ksocknal_peer_failed(peer);
+ ksocknal_txlist_done(peer->ksnp_ni, &zombies, 1);
+ return 0;
+}
+
+/*
+ * check whether we need to create more connds.
+ * It will try to create new thread if it's necessary, @timeout can
+ * be updated if failed to create, so caller wouldn't keep try while
+ * running out of resource.
+ */
+static int
+ksocknal_connd_check_start(long sec, long *timeout)
+{
+ char name[16];
+ int rc;
+ int total = ksocknal_data.ksnd_connd_starting +
+ ksocknal_data.ksnd_connd_running;
+
+ if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
+ /* still in initializing */
+ return 0;
+ }
+
+ if (total >= *ksocknal_tunables.ksnd_nconnds_max ||
+ total > ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV) {
+ /* can't create more connd, or still have enough
+ * threads to handle more connecting */
+ return 0;
+ }
+
+ if (list_empty(&ksocknal_data.ksnd_connd_routes)) {
+ /* no pending connecting request */
+ return 0;
+ }
+
+ if (sec - ksocknal_data.ksnd_connd_failed_stamp <= 1) {
+ /* may run out of resource, retry later */
+ *timeout = cfs_time_seconds(1);
+ return 0;
+ }
+
+ if (ksocknal_data.ksnd_connd_starting > 0) {
+ /* serialize starting to avoid flood */
+ return 0;
+ }
+
+ ksocknal_data.ksnd_connd_starting_stamp = sec;
+ ksocknal_data.ksnd_connd_starting++;
+ spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
+
+ /* NB: total is the next id */
+ snprintf(name, sizeof(name), "socknal_cd%02d", total);
+ rc = ksocknal_thread_start(ksocknal_connd, NULL, name);
+
+ spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
+ if (rc == 0)
+ return 1;
+
+ /* we tried ... */
+ LASSERT(ksocknal_data.ksnd_connd_starting > 0);
+ ksocknal_data.ksnd_connd_starting--;
+ ksocknal_data.ksnd_connd_failed_stamp = cfs_time_current_sec();
+
+ return 1;
+}
+
+/*
+ * check whether current thread can exit, it will return 1 if there are too
+ * many threads and no creating in past 120 seconds.
+ * Also, this function may update @timeout to make caller come back
+ * again to recheck these conditions.
+ */
+static int
+ksocknal_connd_check_stop(long sec, long *timeout)
+{
+ int val;
+
+ if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
+ /* still in initializing */
+ return 0;
+ }
+
+ if (ksocknal_data.ksnd_connd_starting > 0) {
+ /* in progress of starting new thread */
+ return 0;
+ }
+
+ if (ksocknal_data.ksnd_connd_running <=
+ *ksocknal_tunables.ksnd_nconnds) { /* can't shrink */
+ return 0;
+ }
+
+ /* created thread in past 120 seconds? */
+ val = (int)(ksocknal_data.ksnd_connd_starting_stamp +
+ SOCKNAL_CONND_TIMEOUT - sec);
+
+ *timeout = (val > 0) ? cfs_time_seconds(val) :
+ cfs_time_seconds(SOCKNAL_CONND_TIMEOUT);
+ if (val > 0)
+ return 0;
+
+ /* no creating in past 120 seconds */
+
+ return ksocknal_data.ksnd_connd_running >
+ ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV;
+}
+
+/* Go through connd_routes queue looking for a route that we can process
+ * right now, @timeout_p can be updated if we need to come back later */
+static ksock_route_t *
+ksocknal_connd_get_route_locked(signed long *timeout_p)
+{
+ ksock_route_t *route;
+ cfs_time_t now;
+
+ now = cfs_time_current();
+
+ /* connd_routes can contain both pending and ordinary routes */
+ list_for_each_entry(route, &ksocknal_data.ksnd_connd_routes,
+ ksnr_connd_list) {
+
+ if (route->ksnr_retry_interval == 0 ||
+ cfs_time_aftereq(now, route->ksnr_timeout))
+ return route;
+
+ if (*timeout_p == MAX_SCHEDULE_TIMEOUT ||
+ (int)*timeout_p > (int)(route->ksnr_timeout - now))
+ *timeout_p = (int)(route->ksnr_timeout - now);
+ }
+
+ return NULL;
}
int
-ksocknal_reaper (void *arg)
+ksocknal_connd (void *arg)
+{
+ spinlock_t *connd_lock = &ksocknal_data.ksnd_connd_lock;
+ ksock_connreq_t *cr;
+ wait_queue_t wait;
+ int nloops = 0;
+ int cons_retry = 0;
+
+ cfs_block_allsigs();
+
+ init_waitqueue_entry(&wait, current);
+
+ spin_lock_bh(connd_lock);
+
+ LASSERT(ksocknal_data.ksnd_connd_starting > 0);
+ ksocknal_data.ksnd_connd_starting--;
+ ksocknal_data.ksnd_connd_running++;
+
+ while (!ksocknal_data.ksnd_shuttingdown) {
+ ksock_route_t *route = NULL;
+ long sec = cfs_time_current_sec();
+ long timeout = MAX_SCHEDULE_TIMEOUT;
+ int dropped_lock = 0;
+
+ if (ksocknal_connd_check_stop(sec, &timeout)) {
+ /* wakeup another one to check stop */
+ wake_up(&ksocknal_data.ksnd_connd_waitq);
+ break;
+ }
+
+ if (ksocknal_connd_check_start(sec, &timeout)) {
+ /* created new thread */
+ dropped_lock = 1;
+ }
+
+ if (!list_empty(&ksocknal_data.ksnd_connd_connreqs)) {
+ /* Connection accepted by the listener */
+ cr = list_entry(ksocknal_data.ksnd_connd_connreqs. \
+ next, ksock_connreq_t, ksncr_list);
+
+ list_del(&cr->ksncr_list);
+ spin_unlock_bh(connd_lock);
+ dropped_lock = 1;
+
+ ksocknal_create_conn(cr->ksncr_ni, NULL,
+ cr->ksncr_sock, SOCKLND_CONN_NONE);
+ lnet_ni_decref(cr->ksncr_ni);
+ LIBCFS_FREE(cr, sizeof(*cr));
+
+ spin_lock_bh(connd_lock);
+ }
+
+ /* Only handle an outgoing connection request if there
+ * is a thread left to handle incoming connections and
+ * create new connd */
+ if (ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV <
+ ksocknal_data.ksnd_connd_running) {
+ route = ksocknal_connd_get_route_locked(&timeout);
+ }
+ if (route != NULL) {
+ list_del(&route->ksnr_connd_list);
+ ksocknal_data.ksnd_connd_connecting++;
+ spin_unlock_bh(connd_lock);
+ dropped_lock = 1;
+
+ if (ksocknal_connect(route)) {
+ /* consecutive retry */
+ if (cons_retry++ > SOCKNAL_INSANITY_RECONN) {
+ CWARN("massive consecutive "
+ "re-connecting to %pI4h\n",
+ &route->ksnr_ipaddr);
+ cons_retry = 0;
+ }
+ } else {
+ cons_retry = 0;
+ }
+
+ ksocknal_route_decref(route);
+
+ spin_lock_bh(connd_lock);
+ ksocknal_data.ksnd_connd_connecting--;
+ }
+
+ if (dropped_lock) {
+ if (++nloops < SOCKNAL_RESCHED)
+ continue;
+ spin_unlock_bh(connd_lock);
+ nloops = 0;
+ cond_resched();
+ spin_lock_bh(connd_lock);
+ continue;
+ }
+
+ /* Nothing to do for 'timeout' */
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue_exclusive(&ksocknal_data.ksnd_connd_waitq, &wait);
+ spin_unlock_bh(connd_lock);
+
+ nloops = 0;
+ schedule_timeout(timeout);
+
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&ksocknal_data.ksnd_connd_waitq, &wait);
+ spin_lock_bh(connd_lock);
+ }
+ ksocknal_data.ksnd_connd_running--;
+ spin_unlock_bh(connd_lock);
+
+ ksocknal_thread_fini();
+ return 0;
+}
+
+static ksock_conn_t *
+ksocknal_find_timed_out_conn (ksock_peer_t *peer)
{
- unsigned long flags;
+ /* We're called with a shared lock on ksnd_global_lock */
ksock_conn_t *conn;
- int rc;
-
- kportal_daemonize ("ksocknal_reaper");
- kportal_blockallsigs ();
+ struct list_head *ctmp;
+
+ list_for_each(ctmp, &peer->ksnp_conns) {
+ int error;
+ conn = list_entry(ctmp, ksock_conn_t, ksnc_list);
+
+ /* Don't need the {get,put}connsock dance to deref ksnc_sock */
+ LASSERT (!conn->ksnc_closing);
+
+ error = conn->ksnc_sock->sk->sk_err;
+ if (error != 0) {
+ ksocknal_conn_addref(conn);
+
+ switch (error) {
+ case ECONNRESET:
+ CNETERR("A connection with %s "
+ "(%pI4h:%d) was reset; "
+ "it may have rebooted.\n",
+ libcfs_id2str(peer->ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port);
+ break;
+ case ETIMEDOUT:
+ CNETERR("A connection with %s "
+ "(%pI4h:%d) timed out; the "
+ "network or node may be down.\n",
+ libcfs_id2str(peer->ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port);
+ break;
+ default:
+ CNETERR("An unexpected network error %d "
+ "occurred with %s "
+ "(%pI4h:%d\n", error,
+ libcfs_id2str(peer->ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port);
+ break;
+ }
- while (!ksocknal_data.ksnd_shuttingdown) {
- spin_lock_irqsave (&ksocknal_data.ksnd_reaper_lock, flags);
+ return (conn);
+ }
- if (list_empty (&ksocknal_data.ksnd_reaper_list)) {
- conn = NULL;
- } else {
- conn = list_entry (ksocknal_data.ksnd_reaper_list.next,
- ksock_conn_t, ksnc_list);
- list_del (&conn->ksnc_list);
+ if (conn->ksnc_rx_started &&
+ cfs_time_aftereq(cfs_time_current(),
+ conn->ksnc_rx_deadline)) {
+ /* Timed out incomplete incoming message */
+ ksocknal_conn_addref(conn);
+ CNETERR("Timeout receiving from %s (%pI4h:%d), "
+ "state %d wanted %d left %d\n",
+ libcfs_id2str(peer->ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port,
+ conn->ksnc_rx_state,
+ conn->ksnc_rx_nob_wanted,
+ conn->ksnc_rx_nob_left);
+ return (conn);
}
- spin_unlock_irqrestore (&ksocknal_data.ksnd_reaper_lock, flags);
+ if ((!list_empty(&conn->ksnc_tx_queue) ||
+ conn->ksnc_sock->sk->sk_wmem_queued != 0) &&
+ cfs_time_aftereq(cfs_time_current(),
+ conn->ksnc_tx_deadline)) {
+ /* Timed out messages queued for sending or
+ * buffered in the socket's send buffer */
+ ksocknal_conn_addref(conn);
+ CNETERR("Timeout sending data to %s (%pI4h:%d) "
+ "the network or that node may be down.\n",
+ libcfs_id2str(peer->ksnp_id),
+ &conn->ksnc_ipaddr, conn->ksnc_port);
+ return (conn);
+ }
+ }
+
+ return (NULL);
+}
+
+static inline void
+ksocknal_flush_stale_txs(ksock_peer_t *peer)
+{
+ ksock_tx_t *tx;
+ struct list_head stale_txs = LIST_HEAD_INIT(stale_txs);
+
+ write_lock_bh(&ksocknal_data.ksnd_global_lock);
+
+ while (!list_empty(&peer->ksnp_tx_queue)) {
+ tx = list_entry(peer->ksnp_tx_queue.next,
+ ksock_tx_t, tx_list);
+
+ if (!cfs_time_aftereq(cfs_time_current(),
+ tx->tx_deadline))
+ break;
+
+ list_del(&tx->tx_list);
+ list_add_tail(&tx->tx_list, &stale_txs);
+ }
+
+ write_unlock_bh(&ksocknal_data.ksnd_global_lock);
+
+ ksocknal_txlist_done(peer->ksnp_ni, &stale_txs, 1);
+}
+
+static int
+ksocknal_send_keepalive_locked(ksock_peer_t *peer)
+__must_hold(&ksocknal_data.ksnd_global_lock)
+{
+ ksock_sched_t *sched;
+ ksock_conn_t *conn;
+ ksock_tx_t *tx;
+
+ /* last_alive will be updated by create_conn */
+ if (list_empty(&peer->ksnp_conns))
+ return 0;
- if (conn != NULL)
- ksocknal_close_conn (conn);
- else {
- rc = wait_event_interruptible (ksocknal_data.ksnd_reaper_waitq,
- ksocknal_data.ksnd_shuttingdown ||
- !list_empty(&ksocknal_data.ksnd_reaper_list));
- LASSERT (rc == 0);
+ if (peer->ksnp_proto != &ksocknal_protocol_v3x)
+ return 0;
+
+ if (*ksocknal_tunables.ksnd_keepalive <= 0 ||
+ cfs_time_before(cfs_time_current(),
+ cfs_time_add(peer->ksnp_last_alive,
+ cfs_time_seconds(*ksocknal_tunables.ksnd_keepalive))))
+ return 0;
+
+ if (cfs_time_before(cfs_time_current(),
+ peer->ksnp_send_keepalive))
+ return 0;
+
+ /* retry 10 secs later, so we wouldn't put pressure
+ * on this peer if we failed to send keepalive this time */
+ peer->ksnp_send_keepalive = cfs_time_shift(10);
+
+ conn = ksocknal_find_conn_locked(peer, NULL, 1);
+ if (conn != NULL) {
+ sched = conn->ksnc_scheduler;
+
+ spin_lock_bh(&sched->kss_lock);
+ if (!list_empty(&conn->ksnc_tx_queue)) {
+ spin_unlock_bh(&sched->kss_lock);
+ /* there is an queued ACK, don't need keepalive */
+ return 0;
+ }
+
+ spin_unlock_bh(&sched->kss_lock);
+ }
+
+ read_unlock(&ksocknal_data.ksnd_global_lock);
+
+ /* cookie = 1 is reserved for keepalive PING */
+ tx = ksocknal_alloc_tx_noop(1, 1);
+ if (tx == NULL) {
+ read_lock(&ksocknal_data.ksnd_global_lock);
+ return -ENOMEM;
+ }
+
+ if (ksocknal_launch_packet(peer->ksnp_ni, tx, peer->ksnp_id) == 0) {
+ read_lock(&ksocknal_data.ksnd_global_lock);
+ return 1;
+ }
+
+ ksocknal_free_tx(tx);
+ read_lock(&ksocknal_data.ksnd_global_lock);
+
+ return -EIO;
+}
+
+
+static void
+ksocknal_check_peer_timeouts (int idx)
+{
+ struct list_head *peers = &ksocknal_data.ksnd_peers[idx];
+ ksock_peer_t *peer;
+ ksock_conn_t *conn;
+ ksock_tx_t *tx;
+
+ again:
+ /* NB. We expect to have a look at all the peers and not find any
+ * connections to time out, so we just use a shared lock while we
+ * take a look... */
+ read_lock(&ksocknal_data.ksnd_global_lock);
+
+ list_for_each_entry(peer, peers, ksnp_list) {
+ ksock_tx_t *tx_stale;
+ cfs_time_t deadline = 0;
+ int resid = 0;
+ int n = 0;
+
+ if (ksocknal_send_keepalive_locked(peer) != 0) {
+ read_unlock(&ksocknal_data.ksnd_global_lock);
+ goto again;
+ }
+
+ conn = ksocknal_find_timed_out_conn (peer);
+
+ if (conn != NULL) {
+ read_unlock(&ksocknal_data.ksnd_global_lock);
+
+ ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
+
+ /* NB we won't find this one again, but we can't
+ * just proceed with the next peer, since we dropped
+ * ksnd_global_lock and it might be dead already! */
+ ksocknal_conn_decref(conn);
+ goto again;
}
+
+ /* we can't process stale txs right here because we're
+ * holding only shared lock */
+ if (!list_empty(&peer->ksnp_tx_queue)) {
+ ksock_tx_t *tx =
+ list_entry(peer->ksnp_tx_queue.next,
+ ksock_tx_t, tx_list);
+
+ if (cfs_time_aftereq(cfs_time_current(),
+ tx->tx_deadline)) {
+
+ ksocknal_peer_addref(peer);
+ read_unlock(&ksocknal_data.ksnd_global_lock);
+
+ ksocknal_flush_stale_txs(peer);
+
+ ksocknal_peer_decref(peer);
+ goto again;
+ }
+ }
+
+ if (list_empty(&peer->ksnp_zc_req_list))
+ continue;
+
+ tx_stale = NULL;
+ spin_lock(&peer->ksnp_lock);
+ list_for_each_entry(tx, &peer->ksnp_zc_req_list, tx_zc_list) {
+ if (!cfs_time_aftereq(cfs_time_current(),
+ tx->tx_deadline))
+ break;
+ /* ignore the TX if connection is being closed */
+ if (tx->tx_conn->ksnc_closing)
+ continue;
+ n++;
+ if (tx_stale == NULL)
+ tx_stale = tx;
+ }
+
+ if (tx_stale == NULL) {
+ spin_unlock(&peer->ksnp_lock);
+ continue;
+ }
+
+ deadline = tx_stale->tx_deadline;
+ resid = tx_stale->tx_resid;
+ conn = tx_stale->tx_conn;
+ ksocknal_conn_addref(conn);
+
+ spin_unlock(&peer->ksnp_lock);
+ read_unlock(&ksocknal_data.ksnd_global_lock);
+
+ CERROR("Total %d stale ZC_REQs for peer %s detected; the "
+ "oldest(%p) timed out %ld secs ago, "
+ "resid: %d, wmem: %d\n",
+ n, libcfs_nid2str(peer->ksnp_id.nid), tx_stale,
+ cfs_duration_sec(cfs_time_current() - deadline),
+ resid, conn->ksnc_sock->sk->sk_wmem_queued);
+
+ ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT);
+ ksocknal_conn_decref(conn);
+ goto again;
}
- ksocknal_thread_fini ();
- return (0);
+ read_unlock(&ksocknal_data.ksnd_global_lock);
}
-nal_cb_t ksocknal_lib = {
- nal_data: &ksocknal_data, /* NAL private data */
- cb_send: ksocknal_send,
- cb_send_pages: ksocknal_send_pages,
- cb_recv: ksocknal_recv,
- cb_recv_pages: ksocknal_recv_pages,
- cb_read: ksocknal_read,
- cb_write: ksocknal_write,
- cb_callback: ksocknal_callback,
- cb_malloc: ksocknal_malloc,
- cb_free: ksocknal_free,
- cb_printf: ksocknal_printf,
- cb_cli: ksocknal_cli,
- cb_sti: ksocknal_sti,
- cb_dist: ksocknal_dist
-};
+int ksocknal_reaper(void *arg)
+{
+ wait_queue_t wait;
+ ksock_conn_t *conn;
+ ksock_sched_t *sched;
+ struct list_head enomem_conns;
+ int nenomem_conns;
+ cfs_duration_t timeout;
+ int i;
+ int peer_index = 0;
+ cfs_time_t deadline = cfs_time_current();
+
+ cfs_block_allsigs ();
+
+ INIT_LIST_HEAD(&enomem_conns);
+ init_waitqueue_entry(&wait, current);
+
+ spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
+
+ while (!ksocknal_data.ksnd_shuttingdown) {
+
+ if (!list_empty(&ksocknal_data.ksnd_deathrow_conns)) {
+ conn = list_entry(ksocknal_data. \
+ ksnd_deathrow_conns.next,
+ ksock_conn_t, ksnc_list);
+ list_del(&conn->ksnc_list);
+
+ spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
+
+ ksocknal_terminate_conn(conn);
+ ksocknal_conn_decref(conn);
+
+ spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
+ continue;
+ }
+
+ if (!list_empty(&ksocknal_data.ksnd_zombie_conns)) {
+ conn = list_entry(ksocknal_data.ksnd_zombie_conns.\
+ next, ksock_conn_t, ksnc_list);
+ list_del(&conn->ksnc_list);
+
+ spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
+
+ ksocknal_destroy_conn(conn);
+
+ spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
+ continue;
+ }
+
+ if (!list_empty(&ksocknal_data.ksnd_enomem_conns)) {
+ list_add(&enomem_conns,
+ &ksocknal_data.ksnd_enomem_conns);
+ list_del_init(&ksocknal_data.ksnd_enomem_conns);
+ }
+
+ spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
+
+ /* reschedule all the connections that stalled with ENOMEM... */
+ nenomem_conns = 0;
+ while (!list_empty(&enomem_conns)) {
+ conn = list_entry(enomem_conns.next,
+ ksock_conn_t, ksnc_tx_list);
+ list_del(&conn->ksnc_tx_list);
+
+ sched = conn->ksnc_scheduler;
+
+ spin_lock_bh(&sched->kss_lock);
+
+ LASSERT(conn->ksnc_tx_scheduled);
+ conn->ksnc_tx_ready = 1;
+ list_add_tail(&conn->ksnc_tx_list,
+ &sched->kss_tx_conns);
+ wake_up(&sched->kss_waitq);
+
+ spin_unlock_bh(&sched->kss_lock);
+ nenomem_conns++;
+ }
+
+ /* careful with the jiffy wrap... */
+ while ((timeout = cfs_time_sub(deadline,
+ cfs_time_current())) <= 0) {
+ const int n = 4;
+ const int p = 1;
+ int chunk = ksocknal_data.ksnd_peer_hash_size;
+
+ /* Time to check for timeouts on a few more peers: I do
+ * checks every 'p' seconds on a proportion of the peer
+ * table and I need to check every connection 'n' times
+ * within a timeout interval, to ensure I detect a
+ * timeout on any connection within (n+1)/n times the
+ * timeout interval. */
+
+ if (*ksocknal_tunables.ksnd_timeout > n * p)
+ chunk = (chunk * n * p) /
+ *ksocknal_tunables.ksnd_timeout;
+ if (chunk == 0)
+ chunk = 1;
+
+ for (i = 0; i < chunk; i++) {
+ ksocknal_check_peer_timeouts (peer_index);
+ peer_index = (peer_index + 1) %
+ ksocknal_data.ksnd_peer_hash_size;
+ }
+
+ deadline = cfs_time_add(deadline, cfs_time_seconds(p));
+ }
+
+ if (nenomem_conns != 0) {
+ /* Reduce my timeout if I rescheduled ENOMEM conns.
+ * This also prevents me getting woken immediately
+ * if any go back on my enomem list. */
+ timeout = SOCKNAL_ENOMEM_RETRY;
+ }
+ ksocknal_data.ksnd_reaper_waketime =
+ cfs_time_add(cfs_time_current(), timeout);
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
+
+ if (!ksocknal_data.ksnd_shuttingdown &&
+ list_empty(&ksocknal_data.ksnd_deathrow_conns) &&
+ list_empty(&ksocknal_data.ksnd_zombie_conns))
+ schedule_timeout(timeout);
+
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
+
+ spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
+ }
+
+ spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
+
+ ksocknal_thread_fini();
+ return 0;
+}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff