/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * Copyright (C) 2004 Cluster File Systems, Inc. * Author: Eric Barton * * This file is part of Lustre, http://www.lustre.org. * * Lustre is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. * * Lustre is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Lustre; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include "ranal.h" int kranal_dist(lib_nal_t *nal, ptl_nid_t nid, unsigned long *dist) { /* I would guess that if kranal_get_peer (nid) == NULL, and we're not routing, then 'nid' is very distant :) */ if ( nal->libnal_ni.ni_pid.nid == nid ) { *dist = 0; } else { *dist = 1; } return 0; } void kranal_device_callback(RAP_INT32 devid) { kra_device_t *dev; int i; for (i = 0; i < kranal_data.kra_ndevs; i++) { dev = &kranal_data.kra_devices[i]; if (dev->rad_id != devid) continue; spin_lock_irqsave(&dev->rad_lock, flags); if (!dev->rad_ready) { dev->rad_ready = 1; wake_up(&dev->rad_waitq); } spin_unlock_irqrestore(&dev->rad_lock, flags); return; } CWARN("callback for unknown device %d\n", devid); } void kranal_schedule_conn(kra_conn_t *conn) { kra_device_t *dev = conn->rac_device; unsigned long flags; spin_lock_irqsave(&dev->rad_lock, flags); if (!conn->rac_scheduled) { kranal_conn_addref(conn); /* +1 ref for scheduler */ conn->rac_scheduled = 1; list_add_tail(&conn->rac_schedlist, &dev->rad_connq); wake_up(&dev->rad_waitq); } spin_unlock_irqrestore(&dev->rad_lock, flags); } void kranal_schedule_cqid (__u32 cqid) { kra_conn_t *conn; struct list_head *conns; struct list_head *tmp; conns = kranal_cqid2connlist(cqid); read_lock(&kranal_data.kra_global_lock); conn = kranal_cqid2conn_locked(cqid); if (conn == NULL) CWARN("no cqid %x\n", cqid); else kranal_schedule_conn(conn); read_unlock(&kranal_data.kra_global_lock); } void kranal_schedule_dev(kra_device_t *dev) { kra_conn_t *conn; struct list_head *conns; struct list_head *tmp; int i; /* Don't do this in IRQ context (servers may have 1000s of clients) */ LASSERT (!in_interrupt()); CWARN("Scheduling ALL conns on device %d\n", dev->rad_id); for (i = 0; i < kranal_data.kra_conn_hash_size; i++) { /* Drop the lock on each hash bucket to ensure we don't * block anyone for too long at IRQ priority on another CPU */ read_lock(&kranal_data.kra_global_lock); conns = &kranal_data.kra_conns[i]; list_for_each (tmp, conns) { conn = list_entry(tmp, kra_conn_t, rac_hashlist); if (conn->rac_device == dev) kranal_schedule_conn(conn); } read_unlock(&kranal_data.kra_global_lock); } } void kranal_tx_done (kra_tx_t *tx, int completion) { ptl_err_t ptlrc = (completion == 0) ? PTL_OK : PTL_FAIL; kra_device_t *dev; unsigned long flags; int i; RAP_RETURN rrc; LASSERT (!in_interrupt()); switch (tx->tx_buftype) { default: LBUG(); case RANAL_BUF_NONE: case RANAL_BUF_IMMEDIATE: case RANAL_BUF_PHYS_UNMAPPED: case RANAL_BUF_VIRT_UNMAPPED: break; case RANAL_BUF_PHYS_MAPPED: LASSERT (tx->tx_conn != NULL); dev = tx->tx_con->rac_device; rrc = RapkDeregisterMemory(dev->rad_handle, NULL, dev->rad_ptag, &tx->tx_map_key); LASSERT (rrc == RAP_SUCCESS); break; case RANAL_BUF_VIRT_MAPPED: LASSERT (tx->tx_conn != NULL); dev = tx->tx_con->rac_device; rrc = RapkDeregisterMemory(dev->rad_handle, tx->tx_buffer dev->rad_ptag, &tx->tx_map_key); LASSERT (rrc == RAP_SUCCESS); break; } for (i = 0; i < 2; i++) { /* tx may have up to 2 libmsgs to finalise */ if (tx->tx_libmsg[i] == NULL) continue; lib_finalize(&kranal_lib, NULL, tx->tx_libmsg[i], ptlrc); tx->tx_libmsg[i] = NULL; } tx->tx_buftype = RANAL_BUF_NONE; tx->tx_msg.ram_type = RANAL_MSG_NONE; tx->tx_conn = NULL; spin_lock_irqsave(&kranal_data.kra_tx_lock, flags); if (tx->tx_isnblk) { list_add_tail(&tx->tx_list, &kranal_data.kra_idle_nblk_txs); } else { list_add_tail(&tx->tx_list, &kranal_data.kra_idle_txs); wake_up(&kranal_data.kra_idle_tx_waitq); } spin_unlock_irqrestore(&kranal_data.kra_tx_lock, flags); } kra_tx_t * kranal_get_idle_tx (int may_block) { unsigned long flags; kra_tx_t *tx = NULL; for (;;) { spin_lock_irqsave(&kranal_data.kra_tx_lock, flags); /* "normal" descriptor is free */ if (!list_empty(&kranal_data.kra_idle_txs)) { tx = list_entry(kranal_data.kra_idle_txs.next, kra_tx_t, tx_list); break; } if (!may_block) { /* may dip into reserve pool */ if (list_empty(&kranal_data.kra_idle_nblk_txs)) { CERROR("reserved tx desc pool exhausted\n"); break; } tx = list_entry(kranal_data.kra_idle_nblk_txs.next, kra_tx_t, tx_list); break; } /* block for idle tx */ spin_unlock_irqrestore(&kranal_data.kra_tx_lock, flags); wait_event(kranal_data.kra_idle_tx_waitq, !list_empty(&kranal_data.kra_idle_txs)); } if (tx != NULL) { list_del(&tx->tx_list); /* Allocate a new completion cookie. It might not be * needed, but we've got a lock right now... */ tx->tx_cookie = kranal_data.kra_next_tx_cookie++; LASSERT (tx->tx_buftype == RANAL_BUF_NONE); LASSERT (tx->tx_msg.ram_type == RANAL_MSG_NONE); LASSERT (tx->tx_conn == NULL); LASSERT (tx->tx_libmsg[0] == NULL); LASSERT (tx->tx_libmsg[1] == NULL); } spin_unlock_irqrestore(&kranal_data.kra_tx_lock, flags); return tx; } void kranal_init_msg(kra_msg_t *msg, int type) { msg->ram_magic = RANAL_MSG_MAGIC; msg->ram_version = RANAL_MSG_VERSION; msg->ram_type = type; msg->ram_srcnid = kranal_lib.libnal_ni.ni_pid.nid; /* ram_incarnation gets set when FMA is sent */ } kra_tx_t kranal_new_tx_msg (int may_block, int type) { kra_tx_t *tx = kranal_get_idle_tx(may_block); if (tx == NULL) return NULL; kranal_init_msg(&tx->tx_msg, type); return tx; } int kranal_setup_immediate_buffer (kra_tx_t *tx, int niov, struct iovec *iov, int offset, int nob) { LASSERT (nob > 0); LASSERT (niov > 0); LASSERT (tx->tx_buftype == RANAL_BUF_NONE); while (offset >= iov->iov_len) { offset -= iov->iov_len; niov--; iov++; LASSERT (niov > 0); } if (nob > iov->iov_len - offset) { CERROR("Can't handle multiple vaddr fragments\n"); return -EMSGSIZE; } tx->tx_bufftype = RANAL_BUF_IMMEDIATE; tx->tx_nob = nob; tx->tx_buffer = (void *)(((unsigned long)iov->iov_base) + offset); return 0; } int kranal_setup_virt_buffer (kra_tx_t *tx, int niov, struct iovec *iov, int offset, int nob) { LASSERT (nob > 0); LASSERT (niov > 0); LASSERT (tx->tx_buftype == RANAL_BUF_NONE); while (offset >= iov->iov_len) { offset -= iov->iov_len; niov--; iov++; LASSERT (niov > 0); } if (nob > iov->iov_len - offset) { CERROR("Can't handle multiple vaddr fragments\n"); return -EMSGSIZE; } tx->tx_bufftype = RANAL_BUF_VIRT_UNMAPPED; tx->tx_nob = nob; tx->tx_buffer = (void *)(((unsigned long)iov->iov_base) + offset); return 0; } int kranal_setup_phys_buffer (kra_tx_t *tx, int nkiov, ptl_kiov_t *kiov, int offset, int nob) { RAP_PHYS_REGION *phys = tx->tx_phys; int resid; CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob); LASSERT (nob > 0); LASSERT (nkiov > 0); LASSERT (tx->tx_buftype == RANAL_BUF_NONE); while (offset >= kiov->kiov_len) { offset -= kiov->kiov_len; nkiov--; kiov++; LASSERT (nkiov > 0); } tx->tx_bufftype = RANAL_BUF_PHYS_UNMAPPED; tx->tx_nob = nob; tx->tx_buffer = NULL; tx->tx_phys_offset = kiov->kiov_offset + offset; phys->Address = kranal_page2phys(kiov->kiov_page); phys->Length = PAGE_SIZE; phys++; resid = nob - (kiov->kiov_len - offset); while (resid > 0) { kiov++; nkiov--; LASSERT (nkiov > 0); if (kiov->kiov_offset != 0 || ((resid > PAGE_SIZE) && kiov->kiov_len < PAGE_SIZE)) { int i; /* Can't have gaps */ CERROR("Can't make payload contiguous in I/O VM:" "page %d, offset %d, len %d \n", nphys, kiov->kiov_offset, kiov->kiov_len); for (i = -nphys; i < nkiov; i++) { CERROR("kiov[%d] %p +%d for %d\n", i, kiov[i].kiov_page, kiov[i].kiov_offset, kiov[i].kiov_len); } return -EINVAL; } if ((phys - tx->tx_phys) == PTL_MD_MAX_IOV) { CERROR ("payload too big (%d)\n", phys - tx->tx_phys); return -EMSGSIZE; } phys->Address = kranal_page2phys(kiov->kiov_page); phys->Length = PAGE_SIZE; phys++; resid -= PAGE_SIZE; } tx->tx_phys_npages = phys - tx->tx_phys; return 0; } static inline int kranal_setup_buffer (kra_tx_t *tx, int niov, struct iovec *iov, ptl_kiov_t *kiov, int offset, int nob) { LASSERT ((iov == NULL) != (kiov == NULL)); if (kiov != NULL) return kranal_setup_phys_buffer(tx, niov, kiov, offset, nob); return kranal_setup_virt_buffer(tx, niov, kiov, offset, nob); } void kranal_map_buffer (kra_tx_t *tx) { kra_conn_t *conn = tx->tx_conn; kra_device_t *dev = conn->rac_device; switch (tx->tx_buftype) { default: case RANAL_BUF_PHYS_UNMAPPED: rrc = RapkRegisterPhys(conn->rac_device->rad_handle, tx->tx_phys, tx->tx_phys_npages, conn->rac_device->rad_ptag, &tx->tx_map_key); LASSERT (rrc == RAP_SUCCESS); tx->tx_buftype = RANAL_BUF_PHYS_MAPPED; return; case RANAL_BUF_VIRT_UNMAPPED: rrc = RapkRegisterMemory(conn->rac_device->rad_handle, tx->tx_buffer, tx->tx_nob, conn->rac_device->rad_ptag, &tx->tx_map_key); LASSERT (rrc == RAP_SUCCESS); tx->tx_buftype = RANAL_BUF_VIRT_MAPPED; return; } } kra_conn_t * kranal_find_conn_locked (kra_peer_t *peer) { struct list_head *tmp; /* just return the first connection */ list_for_each (tmp, &peer->rap_conns) { return list_entry(tmp, kra_conn_t, rac_list); } return NULL; } void kranal_post_fma (kra_conn_t *conn, kra_tx_t *tx) { unsigned long flags; tx->tx_conn = conn; spin_lock_irqsave(&conn->rac_lock, flags); list_add_tail(&tx->tx_list, &conn->rac_fmaq); tx->tx_qtime = jiffies; spin_unlock_irqrestore(&conn->rac_lock, flags); kranal_schedule_conn(conn); } void kranal_launch_tx (kra_tx_t *tx, ptl_nid_t nid) { unsigned long flags; kra_peer_t *peer; kra_conn_t *conn; unsigned long now; rwlock_t *g_lock = &kranal_data.kra_global_lock; /* If I get here, I've committed to send, so I complete the tx with * failure on any problems */ LASSERT (tx->tx_conn == NULL); /* only set when assigned a conn */ read_lock(g_lock); peer = kranal_find_peer_locked(nid); if (peer == NULL) { read_unlock(g_lock); kranal_tx_done(tx, -EHOSTUNREACH); return; } conn = kranal_find_conn_locked(peer); if (conn != NULL) { kranal_post_fma(conn, tx); read_unlock(g_lock); return; } /* Making one or more connections; I'll need a write lock... */ read_unlock(g_lock); write_lock_irqsave(g_lock, flags); peer = kranal_find_peer_locked(nid); if (peer == NULL) { write_unlock_irqrestore(g_lock, flags); kranal_tx_done(tx -EHOSTUNREACH); return; } conn = kranal_find_conn_locked(peer); if (conn != NULL) { /* Connection exists; queue message on it */ kranal_post_fma(conn, tx); write_unlock_irqrestore(g_lock, flags); return; } LASSERT (peer->rap_persistence > 0); if (!peer->rap_connecting) { now = CURRENT_TIME; if (now < peer->rap_reconnect_time) { write_unlock_irqrestore(g_lock, flags); kranal_tx_done(tx, -EHOSTUNREACH); return; } peer->rap_connecting = 1; kranal_peer_addref(peer); /* extra ref for connd */ spin_lock(&kranal_data.kra_connd_lock); list_add_tail(&peer->rap_connd_list, &kranal_data.kra_connd_peers); wake_up(&kranal_data.kra_connd_waitq); spin_unlock(&kranal_data.kra_connd_lock); } /* A connection is being established; queue the message... */ list_add_tail(&tx->tx_list, &peer->rap_tx_queue); write_unlock_irqrestore(g_lock, flags); } static void kranal_rdma(kra_tx_t *tx, int type, kra_rdma_desc_t *rard, int nob, __u64 cookie) { kra_conn_t *conn = tx->tx_conn; RAP_RETURN rrc; /* prep final completion message */ kranal_init_msg(&tx->tx_msg, type); tx->tx_msg.ram_u.completion.racm_cookie = cookie; LASSERT (tx->tx_buftype == RANAL_BUF_PHYS_MAPPED || tx->tx_buftype == RANAL_BUF_VIRT_MAPPED); LASSERT (nob <= rard->rard_nob); memset(&tx->tx_rdma_desc, 0, sizeof(tx->tx_rdma_desc)); tx->tx_rdma_desc.SrcPtr = tx->tx_buffer; tx->tx_rdma_desc.SrcKey = tx->tx_map_key; tx->tx_rdma_desc.DstPtr = rard->rard_addr; tx->tx_rdma_desc.DstKey = rard->rard_key; tx->tx_rdma_desc.Length = nob; tx->tx_rdma_desc.AppPtr = tx; if (nob == 0) { /* Immediate completion */ kranal_post_fma(conn, tx); return; } rrc = RapkPostRdma(conn->rac_rihandle, &tx->tx_rdma_desc); LASSERT (rrc == RAP_SUCCESS); spin_lock_irqsave(&conn->rac_lock, flags); list_add_tail(&tx->tx_list, &conn->rac_rdmaq); tx->tx_qtime = jiffies; spin_unlock_irqrestore(&conn->rac_lock, flags); } int kranal_consume_rxmsg (kra_conn_t *conn, void *buffer, int nob) { __u32 nob_received = nob; RAP_RETURN rrc; LASSERT (conn->rac_rxmsg != NULL); rrc = RapkFmaCopyToUser(conn->rac_rihandle, buffer, &nob_received, sizeof(kra_msg_t)); LASSERT (rrc == RAP_SUCCESS); conn->rac_rxmsg = NULL; if (nob_received != nob) { CWARN("Expected %d immediate bytes but got %d\n", nob, nob_received); return -EPROTO; } return 0; } ptl_err_t kranal_do_send (lib_nal_t *nal, void *private, lib_msg_t *libmsg, ptl_hdr_t *hdr, int type, ptl_nid_t nid, ptl_pid_t pid, unsigned int niov, struct iovec *iov, ptl_kiov_t *kiov, size_t offset, size_t nob) { kra_conn_t *conn; kra_tx_t *tx; /* NB 'private' is different depending on what we're sending.... */ CDEBUG(D_NET, "sending "LPSZ" bytes in %d frags to nid:"LPX64 " pid %d\n", nob, niov, nid , pid); LASSERT (nob == 0 || niov > 0); LASSERT (niov <= PTL_MD_MAX_IOV); LASSERT (!in_interrupt()); /* payload is either all vaddrs or all pages */ LASSERT (!(kiov != NULL && iov != NULL)); switch(type) { default: LBUG(); case PTL_MSG_REPLY: { /* reply's 'private' is the conn that received the GET_REQ */ conn = private; LASSERT (conn->rac_rxmsg != NULL); if (conn->rac_rxmsg->ram_type == RANAL_MSG_IMMEDIATE) { if (nob > RANAL_MAX_IMMEDIATE) { CERROR("Can't REPLY IMMEDIATE %d to "LPX64"\n", nob, nid); return PTL_FAIL; } break; /* RDMA not expected */ } /* Incoming message consistent with immediate reply? */ if (conn->rac_rxmsg->ram_type != RANAL_MSG_GET_REQ) { CERROR("REPLY to "LPX64" bad msg type %x!!!\n", nid, conn->rac_rxmsg->ram_type); return PTL_FAIL; } tx = kranal_get_idle_tx(0); if (tx == NULL) return PTL_FAIL; rc = kranal_setup_buffer(tx, niov, iov, kiov, offset, nob); if (rc != 0) { kranal_tx_done(tx, rc); return PTL_FAIL; } tx->tx_conn = conn; tx->tx_libmsg[0] = libmsg; kranal_map_buffer(tx); kranal_rdma(tx, RANAL_MSG_GET_DONE, &conn->rac_rxmsg->ram_u.getreq.ragm_desc, nob, &conn->rac_rxmsg->ram_u.getreq.ragm_cookie); return PTL_OK; } case PTL_MSG_GET: if (kiov == NULL && /* not paged */ nob <= RANAL_MAX_IMMEDIATE && /* small enough */ nob <= kranal_tunables.kra_max_immediate) break; /* send IMMEDIATE */ tx = kranal_new_tx_msg(0, RANAL_MSG_GET_REQ); if (tx == NULL) return PTL_NO_SPACE; rc = kranal_setup_buffer(tx, niov, iov, kiov, offset, nob); if (rc != 0) { kranal_tx_done(tx, rc); return PTL_FAIL; } tx->tx_libmsg[1] = lib_create_reply_msg(&kranal_lib, nid, libmsg); if (tx->tx_libmsg[1] == NULL) { CERROR("Can't create reply for GET to "LPX64"\n", nid); kranal_tx_done(tx, rc); return PTL_FAIL; } tx->tx_libmsg[0] = libmsg; tx->tx_msg.ram_u.get.ragm_hdr = *hdr; /* rest of tx_msg is setup just before it is sent */ kranal_launch_tx(tx, nid); return PTL_OK case PTL_MSG_ACK: LASSERT (nob == 0); break; case PTL_MSG_PUT: if (kiov == NULL && /* not paged */ nob <= RANAL_MAX_IMMEDIATE && /* small enough */ nob <= kranal_tunables.kra_max_immediate) break; /* send IMMEDIATE */ tx = kranal_new_tx_msg(!in_interrupt(), RANA_MSG_PUT_REQ); if (tx == NULL) return PTL_NO_SPACE; rc = kranal_setup_buffer(tx, niov, iov, kiov, offset, nob); if (rc != 0) { kranal_tx_done(tx, rc); return PTL_FAIL; } tx->tx_libmsg[0] = libmsg; tx->tx_msg.ram_u.putreq.raprm_hdr = *hdr; /* rest of tx_msg is setup just before it is sent */ kranal_launch_tx(tx, nid); return PTL_OK; } LASSERT (kiov == NULL); LASSERT (nob <= RANAL_MAX_IMMEDIATE); tx = kranal_new_tx_msg(!(type == PTL_MSG_ACK || type == PTL_MSG_REPLY || in_interrupt()), RANAL_MSG_IMMEDIATE); if (tx == NULL) return PTL_NO_SPACE; rc = kranal_setup_immediate_buffer(tx, niov, iov, offset, nob); if (rc != 0) { kranal_tx_done(tx, rc); return PTL_FAIL; } tx->tx_msg.ram_u.immediate.raim_hdr = *hdr; tx->tx_libmsg[0] = libmsg; kranal_launch_tx(tx, nid); return PTL_OK; } ptl_err_t kranal_send (lib_nal_t *nal, void *private, lib_msg_t *cookie, ptl_hdr_t *hdr, int type, ptl_nid_t nid, ptl_pid_t pid, unsigned int niov, struct iovec *iov, size_t offset, size_t len) { return kranal_do_send(nal, private, cookie, hdr, type, nid, pid, niov, iov, NULL, offset, len); } ptl_err_t kranal_send_pages (lib_nal_t *nal, void *private, lib_msg_t *cookie, ptl_hdr_t *hdr, int type, ptl_nid_t nid, ptl_pid_t pid, unsigned int niov, ptl_kiov_t *kiov, size_t offset, size_t len) { return kranal_do_send(nal, private, cookie, hdr, type, nid, pid, niov, NULL, kiov, offset, len); } ptl_err_t kranal_recvmsg (lib_nal_t *nal, void *private, lib_msg_t *libmsg, unsigned int niov, struct iovec *iov, ptl_kiov_t *kiov, size_t offset, size_t mlen, size_t rlen) { kra_conn_t *conn = private; kra_msg_t *rxmsg = conn->rac_rxmsg; void *buffer; int rc; LASSERT (mlen <= rlen); LASSERT (!in_interrupt()); /* Either all pages or all vaddrs */ LASSERT (!(kiov != NULL && iov != NULL)); switch(rxmsg->ram_type) { default: LBUG(); return PTL_FAIL; case RANAL_MSG_IMMEDIATE: if (mlen == 0) { buffer = NULL; } else if (kiov != NULL) { CERROR("Can't recv immediate into paged buffer\n"); return PTL_FAIL; } else { LASSERT (niov > 0); while (offset >= iov->iov_len) { offset -= iov->iov_len; iov++; niov--; LASSERT (niov > 0); } if (mlen > iov->iov_len - offset) { CERROR("Can't handle immediate frags\n"); return PTL_FAIL; } buffer = ((char *)iov->iov_base) + offset; } rc = kranal_consume_rxmsg(conn, buffer, mlen); lib_finalize(nal, NULL, libmsg, (rc == 0) ? PTL_OK : PTL_FAIL); return PTL_OK; case RANAL_MSG_GET_REQ: /* If the GET matched, we've already handled it in * kranal_do_send which is called to send the REPLY. We're * only called here to complete the GET receive (if we needed * it which we don't, but I digress...) */ LASSERT (libmsg == NULL); lib_finalize(nal, NULL, libmsg, PTL_OK); return PTL_OK; case RANAL_MSG_PUT_REQ: if (libmsg == NULL) { /* PUT didn't match... */ lib_finalize(null, NULL, libmsg, PTL_OK); return PTL_OK; } tx = kranal_new_tx_msg(0, RANAL_MSG_PUT_ACK); if (tx == NULL) return PTL_NO_SPACE; rc = kranal_setup_buffer(tx, niov, iov, kiov, offset, mlen); if (rc != 0) { kranal_tx_done(tx, rc); return PTL_FAIL; } kranal_map_buffer(tx); tx->tx_msg.ram_u.putack.rapam_src_cookie = conn->rac_rxmsg->ram_u.putreq.raprm_cookie; tx->tx_msg.ram_u.putack.rapam_dst_cookie = tx->tx_cookie; tx->tx_msg.ram_u.putack.rapam_dst.desc.rard_key = tx->tx_map_key; tx->tx_msg.ram_u.putack.rapam_dst.desc.rard_addr = tx->tx_buffer; tx->tx_msg.ram_u.putack.rapam_dst.desc.rard_nob = mlen; tx->tx_libmsg[0] = libmsg; /* finalize this on RDMA_DONE */ kranal_post_fma(conn, tx); /* flag matched by consuming rx message */ kranal_consume_rxmsg(conn, NULL, 0); return PTL_OK; } } ptl_err_t kranal_recv (lib_nal_t *nal, void *private, lib_msg_t *msg, unsigned int niov, struct iovec *iov, size_t offset, size_t mlen, size_t rlen) { return kranal_recvmsg(nal, private, msg, niov, iov, NULL, offset, mlen, rlen); } ptl_err_t kranal_recv_pages (lib_nal_t *nal, void *private, lib_msg_t *msg, unsigned int niov, ptl_kiov_t *kiov, size_t offset, size_t mlen, size_t rlen) { return kranal_recvmsg(nal, private, msg, niov, NULL, kiov, offset, mlen, rlen); } int kranal_thread_start (int(*fn)(void *arg), void *arg) { long pid = kernel_thread(fn, arg, 0); if (pid < 0) return(int)pid; atomic_inc(&kranal_data.kra_nthreads); return 0; } void kranal_thread_fini (void) { atomic_dec(&kranal_data.kra_nthreads); } int kranal_check_conn (kra_conn_t *conn) { kra_tx_t *tx; struct list_head *ttmp; unsigned long flags; long timeout; unsigned long now = jiffies; if (!conn->rac_closing && time_after_eq(now, conn->rac_last_sent + conn->rac_keepalive * HZ)) { /* not sent in a while; schedule conn so scheduler sends a keepalive */ kranal_schedule_conn(conn); } /* wait twice as long for CLOSE to be sure peer is dead */ timeout = (conn->rac_closing ? 1 : 2) * conn->rac_timeout * HZ; if (!conn->rac_close_recvd && time_after_eq(now, conn->rac_last_rx + timeout)) { CERROR("Nothing received from "LPX64" within %d seconds\n", conn->rac_peer->rap_nid, (now - conn->rac_last_rx)/HZ); return -ETIMEDOUT; } if (conn->rac_closing) return 0; /* Check the conn's queues are moving. These are "belt+braces" checks, * in case of hardware/software errors that make this conn seem * responsive even though it isn't progressing its message queues. */ spin_lock_irqsave(&conn->rac_lock, flags); list_for_each (ttmp, &conn->rac_fmaq) { tx = list_entry(ttmp, kra_tx_t, tx_list); if (time_after_eq(now, tx->tx_qtime + timeout)) { spin_unlock_irqrestore(&conn->rac_lock, flags); CERROR("tx on fmaq for "LPX64" blocked %d seconds\n", conn->rac_perr->rap_nid, (now - tx->tx_qtime)/HZ); return -ETIMEDOUT; } } list_for_each (ttmp, &conn->rac_rdmaq) { tx = list_entry(ttmp, kra_tx_t, tx_list); if (time_after_eq(now, tx->tx_qtime + timeout)) { spin_unlock_irqrestore(&conn->rac_lock, flags); CERROR("tx on rdmaq for "LPX64" blocked %d seconds\n", conn->rac_perr->rap_nid, (now - tx->tx_qtime)/HZ); return -ETIMEDOUT; } } list_for_each (ttmp, &conn->rac_replyq) { tx = list_entry(ttmp, kra_tx_t, tx_list); if (time_after_eq(now, tx->tx_qtime + timeout)) { spin_unlock_irqrestore(&conn->rac_lock, flags); CERROR("tx on replyq for "LPX64" blocked %d seconds\n", conn->rac_perr->rap_nid, (now - tx->tx_qtime)/HZ); return -ETIMEDOUT; } } spin_unlock_irqrestore(&conn->rac_lock, flags); return 0; } void kranal_check_conns (int idx, unsigned long *min_timeoutp) { struct list_head *conns = &kranal_data.kra_conns[idx]; struct list_head *ctmp; kra_conn_t *conn; again: /* NB. We expect to check all the conns and not find any problems, so * we just use a shared lock while we take a look... */ read_lock(&kranal_data.kra_global_lock); list_for_each (ctmp, conns) { conn = list_entry(ptmp, kra_conn_t, rac_hashlist); if (conn->rac_timeout < *min_timeoutp ) *min_timeoutp = conn->rac_timeout; if (conn->rac_keepalive < *min_timeoutp ) *min_timeoutp = conn->rac_keepalive; rc = kranal_check_conn(conn); if (rc == 0) continue; kranal_conn_addref(conn); read_unlock(&kranal_data.kra_global_lock); CERROR("Check on conn to "LPX64"failed: %d\n", conn->rac_peer->rap_nid, rc); write_lock_irqsave(&kranal_data.kra_global_lock); if (!conn->rac_closing) kranal_close_conn_locked(conn, -ETIMEDOUT); else kranal_terminate_conn_locked(conn); kranal_conn_decref(conn); /* start again now I've dropped the lock */ goto again; } read_unlock(&kranal_data.kra_global_lock); } int kranal_connd (void *arg) { char name[16]; wait_queue_t wait; unsigned long flags; kra_peer_t *peer; int i; snprintf(name, sizeof(name), "kranal_connd_%02ld", (long)arg); kportal_daemonize(name); kportal_blockallsigs(); init_waitqueue_entry(&wait, current); spin_lock_irqsave(&kranal_data.kra_connd_lock, flags); while (!kranal_data.kra_shutdown) { /* Safe: kra_shutdown only set when quiescent */ if (!list_empty(&kranal_data.kra_connd_peers)) { peer = list_entry(kranal_data.kra_connd_peers.next, kra_peer_t, rap_connd_list); list_del_init(&peer->rap_connd_list); spin_unlock_irqrestore(&kranal_data.kra_connd_lock, flags); kranal_connect(peer); kranal_put_peer(peer); spin_lock_irqsave(&kranal_data.kra_connd_lock, flags); continue; } set_current_state(TASK_INTERRUPTIBLE); add_wait_queue(&kranal_data.kra_connd_waitq, &wait); spin_unlock_irqrestore(&kranal_data.kra_connd_lock, flags); schedule (); set_current_state(TASK_RUNNING); remove_wait_queue(&kranal_data.kra_connd_waitq, &wait); spin_lock_irqsave(&kranal_data.kra_connd_lock, flags); } spin_unlock_irqrestore(&kranal_data.kra_connd_lock, flags); kranal_thread_fini(); return 0; } void kranal_update_reaper_timeout(long timeout) { unsigned long flags; LASSERT (timeout > 0); spin_lock_irqsave(&kranal_data.kra_reaper_lock, flags); if (timeout < kranal_data.kra_new_min_timeout) kranal_data.kra_new_min_timeout = timeout; spin_unlock_irqrestore(&kranal_data.kra_reaper_lock, flags); } int kranal_reaper (void *arg) { wait_queue_t wait; unsigned long flags; kra_conn_t *conn; kra_peer_t *peer; unsigned long flags; long timeout; int i; int conn_entries = kranal_data.kra_conn_hash_size; int conn_index = 0; int base_index = conn_entries - 1; unsigned long next_check_time = jiffies; long next_min_timeout = MAX_SCHEDULE_TIMEOUT; long current_min_timeout = 1; kportal_daemonize("kranal_reaper"); kportal_blockallsigs(); init_waitqueue_entry(&wait, current); spin_lock_irqsave(&kranal_data.kra_reaper_lock, flags); kranal_data.kra_new_min_timeout = 1; while (!kranal_data.kra_shutdown) { /* careful with the jiffy wrap... */ timeout = (long)(next_check_time - jiffies); if (timeout <= 0) { /* I wake up every 'p' seconds to check for * timeouts on some more peers. I try to check * every connection 'n' times within the global * minimum of all keepalive and timeout intervals, * to ensure I attend to every connection within * (n+1)/n times its timeout intervals. */ const int p = 1; const int n = 3; unsigned long min_timeout; int chunk; if (kranal_data.kra_new_min_timeout != MAX_SCHEDULE_TIMEOUT) { /* new min timeout set: restart min timeout scan */ next_min_timeout = MAX_SCHEDULE_TIMEOUT; base_index = conn_index - 1; if (base_index < 0) base_index = conn_entries - 1; if (kranal_data.kra_new_min_timeout < current_min_timeout) { current_min_timeout = kranal_data.kra_new_min_timeout; CWARN("Set new min timeout %ld\n", current_min_timeout); } kranal_data.kra_new_min_timeout = MAX_SCHEDULE_TIMEOUT; } min_timeout = current_min_timeout; spin_unlock_irqrestore(&kranal_data.kra_reaper_lock, flags); LASSERT (min_timeout > 0); /* Compute how many table entries to check now so I * get round the whole table fast enough (NB I do * this at fixed intervals of 'p' seconds) */ chunk = conn_entries; if (min_timeout > n * p) chunk = (chunk * n * p) / min_timeout; if (chunk == 0) chunk = 1; for (i = 0; i < chunk; i++) { kranal_check_conns(conn_index, &next_min_timeout); conn_index = (conn_index + 1) % conn_entries; } next_check_time += p * HZ; spin_lock_irqsave(&kranal_data.kra_reaper_lock, flags); if (((conn_index - chunk <= base_index && base_index < conn_index) || (conn_index - conn_entries - chunk <= base_index && base_index < conn_index - conn_entries))) { /* Scanned all conns: set current_min_timeout... */ if (current_min_timeout != next_min_timeout) { current_min_timeout = next_min_timeout; CWARN("Set new min timeout %ld\n", current_min_timeout); } /* ...and restart min timeout scan */ next_min_timeout = MAX_SCHEDULE_TIMEOUT; base_index = conn_index - 1; if (base_index < 0) base_index = conn_entries - 1; } } set_current_state(TASK_INTERRUPTIBLE); add_wait_queue(&kranal_data.kra_reaper_waitq, &wait); spin_unlock_irqrestore(&kranal_data.kra_reaper_lock, flags); busy_loops = 0; schedule_timeout(timeout); spin_lock_irqsave(&kranal_data.kra_reaper_lock, flags); set_current_state(TASK_RUNNING); remove_wait_queue(&kranal_data.kra_reaper_waitq, &wait); } kranal_thread_fini(); return 0; } void kranal_process_rdmaq (__u32 cqid) { kra_conn_t *conn; kra_tx_t *tx; RAP_RETURN rrc; unsigned long flags; RAP_RDMA_DESCRIPTOR *desc; read_lock(&kranal_data.kra_global_lock); conn = kranal_cqid2conn_locked(cqid); LASSERT (conn != NULL); rrc = RapkRdmaDone(conn->rac_rihandle, &desc); LASSERT (rrc == RAP_SUCCESS); spin_lock_irqsave(&conn->rac_lock, flags); LASSERT (!list_empty(&conn->rac_rdmaq)); tx = list_entry(con->rac_rdmaq.next, kra_tx_t, tx_list); list_del(&tx->tx_list); LASSERT(desc->AppPtr == (void *)tx); LASSERT(desc->tx_msg.ram_type == RANAL_MSG_PUT_DONE || desc->tx_msg.ram_type == RANAL_MSG_GET_DONE); list_add_tail(&tx->tx_list, &conn->rac_fmaq); tx->tx_qtime = jiffies; spin_unlock_irqrestore(&conn->rac_lock, flags); /* Get conn's fmaq processed, now I've just put something there */ kranal_schedule_conn(conn); read_unlock(&kranal_data.kra_global_lock); } int kranal_sendmsg(kra_conn_t *conn, kra_msg_t *msg, void *immediate, int immediatenob) { int sync = (msg->ram_type & RANAL_MSG_FENCE) != 0; LASSERT (sizeof(*msg) <= RANAL_FMA_PREFIX_LEN); LASSERT ((msg->ram_type == RANAL_MSG_IMMEDIATE) ? immediatenob <= RANAL_FMA_MAX_DATA_LEN : immediatenob == 0); msg->ram_incarnation = conn->rac_incarnation; msg->ram_seq = conn->rac_tx_seq; if (sync) rrc = RapkFmaSyncSend(conn->rac_device.rad_handle, immediate, immediatenob, msg, sizeof(*msg)); else rrc = RapkFmaSend(conn->rac_device.rad_handle, immediate, immediatenob, msg, sizeof(*msg)); switch (rrc) { case RAP_SUCCESS: conn->rac_last_tx = jiffies; conn->rac_tx_seq++; return 0; case RAP_NOT_DONE: return -EAGAIN; default: LBUG(); } } int kranal_process_fmaq (kra_conn_t *conn) { unsigned long flags; int more_to_do; kra_tx_t *tx; int rc; int expect_reply; /* NB I will be rescheduled some via a rad_fma_cq event if my FMA is * out of credits when I try to send right now... */ if (conn->rac_closing) { if (!list_empty(&conn->rac_rdmaq)) { /* Can't send CLOSE yet; I'm still waiting for RDMAs I * posted to finish */ LASSERT (!conn->rac_close_sent); kranal_init_msg(&conn->rac_msg, RANAL_MSG_NOOP); kranal_sendmsg(conn, &conn->rac_msg, NULL, 0); return 0; } if (conn->rac_close_sent) return 0; kranal_init_msg(&conn->rac_msg, RANAL_MSG_CLOSE); rc = kranal_sendmsg(conn, &conn->rac_msg, NULL, 0); conn->rac_close_sent = (rc == 0); return 0; } spin_lock_irqsave(&conn->rac_lock, flags); if (list_empty(&conn->rac_fmaq)) { spin_unlock_irqrestore(&conn->rac_lock, flags); if (time_after_eq(conn->rac_last_tx + conn->rac_keepalive)) { kranal_init_msg(&conn->rac_msg, RANAL_MSG_NOOP); kranal_sendmsg(conn, &conn->rac_msg, NULL, 0); } return 0; } tx = list_entry(conn->rac_fmaq.next, kra_tx_t, tx_list); list_del(&tx->tx_list); more_to_do = !list_empty(&conn->rac_fmaq); spin_unlock_irqrestore(&conn->rac_lock, flags); expect_reply = 0; switch (tx->tx_msg.ram_type) { default: LBUG(); case RANAL_MSG_IMMEDIATE: case RANAL_MSG_PUT_NAK: case RANAL_MSG_PUT_DONE: case RANAL_MSG_GET_NAK: case RANAL_MSG_GET_DONE: rc = kranal_sendmsg(conn, &tx->tx_msg, tx->tx_buffer, tx->tx_nob); expect_reply = 0; break; case RANAL_MSG_PUT_REQ: tx->tx_msg.ram_u.putreq.raprm_cookie = tx->tx_cookie; rc = kranal_sendmsg(conn, &tx->tx_msg, NULL, 0); kranal_map_buffer(tx); expect_reply = 1; break; case RANAL_MSG_PUT_ACK: rc = kranal_sendmsg(conn, &tx->tx_msg, NULL, 0); expect_reply = 1; break; case RANAL_MSG_GET_REQ: kranal_map_buffer(tx); tx->tx_msg.ram_u.get.ragm_cookie = tx->tx_cookie; tx->tx_msg.ram_u.get.ragm_desc.rard_key = tx->tx_map_key; tx->tx_msg.ram_u.get.ragm_desc.rard_addr = tx->tx_buffer; tx->tx_msg.ram_u.get.ragm_desc.rard_nob = tx->tx_nob; rc = kranal_sendmsg(conn, &tx->tx_msg, NULL, 0); expect_reply = 1; break; } if (rc == -EAGAIN) { /* replace at the head of the list for later */ spin_lock_irqsave(&conn->rac_lock, flags); list_add(&tx->tx_list, &conn->rac_fmaq); spin_unlock_irqrestore(&conn->rac_lock, flags); return 0; } LASSERT (rc == 0); if (!expect_reply) { kranal_tx_done(tx, 0); } else { spin_lock_irqsave(&conn->rac_lock, flags); list_add_tail(&tx->tx_list, &conn->rac_replyq); tx->tx_qtime = jiffies; spin_unlock_irqrestore(&conn->rac_lock, flags); } return more_to_do; } static inline void kranal_swab_rdma_desc (kra_rdma_desc_t *d) { __swab64s(&d->rard_key.Key); __swab16s(&d->rard_key.Cookie); __swab16s(&d->rard_key.MdHandle); __swab32s(&d->rard_key.Flags); __swab64s(&d->rard_addr); __swab32s(&d->rard_nob); } kra_tx_t * kranal_match_reply(kra_conn_t *conn, int type, __u64 cookie) { unsigned long flags; struct list_head *ttmp; kra_tx_t *tx; list_for_each(ttmp, &conn->rac_replyq) { tx = list_entry(ttmp, kra_tx_t, tx_list); if (tx->tx_cookie != cookie) continue; if (tx->tx_msg.ram_type != type) { CWARN("Unexpected type %x (%x expected) " "matched reply from "LPX64"\n", tx->tx_msg.ram_type, type, conn->rac_peer->rap_nid); return NULL; } } CWARN("Unmatched reply from "LPX64"\n", conn->rac_peer->rap_nid); return NULL; } int kranal_process_receives(kra_conn_t *conn) { unsigned long flags; __u32 seq; __u32 nob; kra_msg_t *msg; RAP_RETURN rrc = RapkFmaGetPrefix(conn->rac_rihandle, &msg); kra_peer_t *peer = conn->rac_peer; if (rrc == RAP_NOT_DONE) return 0; LASSERT (rrc == RAP_SUCCESS); conn->rac_last_rx = jiffies; seq = conn->rac_seq++; if (msg->ram_magic != RANAL_MSG_MAGIC) { if (__swab32(msg->ram_magic) != RANAL_MSG_MAGIC) { CERROR("Unexpected magic %08x from "LPX64"\n", msg->ram_magic, peer->rap_nid); goto out; } __swab32s(&msg->ram_magic); __swab16s(&msg->ram_version); __swab16s(&msg->ram_type); __swab64s(&msg->ram_srcnid); __swab64s(&msg->ram_incarnation); __swab32s(&msg->ram_seq); /* NB message type checked below; NOT here... */ switch (msg->ram_type) { case RANAL_MSG_PUT_ACK: kranal_swab_rdma_desc(&msg->ram_u.putack.rapam_desc); break; case RANAL_MSG_GET_REQ: kranal_swab_rdma_desc(&msg->ram_u.get.ragm_desc); break; default: break; } } if (msg->ram_version != RANAL_MSG_VERSION) { CERROR("Unexpected protocol version %d from "LPX64"\n", msg->ram_version, peer->rap_nid); goto out; } if (msg->ram_srcnid != peer->rap_nid) { CERROR("Unexpected peer "LPX64" from "LPX64"\n", msg->ram_srcnid, peer->rap_nid); goto out; } if (msg->ram_incarnation != conn->rac_incarnation) { CERROR("Unexpected incarnation "LPX64"("LPX64 " expected) from "LPX64"\n", msg->ram_incarnation, conn->rac_incarnation, peer->rap_nid); goto out; } if (msg->ram_seq != seq) { CERROR("Unexpected sequence number %d(%d expected) from " LPX64"\n", msg->ram_seq, seq, peer->rap_nid); goto out; } if ((msg->ram_type & RANAL_MSG_FENCE) != 0) { /* This message signals RDMA completion: wait now... */ rrc = RapkFmaSyncWait(conn->rac_rihandle); LASSERT (rrc == RAP_SUCCESS); } if (msg->ram_type == RANAL_MSG_CLOSE) { conn->rac_close_recvd = 1; write_lock_irqsave(&kranal_data.kra_global_lock); if (!conn->rac_closing) kranal_close_conn_locked(conn, -ETIMEDOUT); else if (conn->rac_close_sent) kranal_terminate_conn_locked(conn); goto out; } if (conn->rac_closing) goto out; conn->rac_rxmsg = msg; /* stash message for portals callbacks */ /* they'll NULL rac_rxmsg if they consume it */ switch (msg->ram_type) { case RANAL_MSG_NOOP: /* Nothing to do; just a keepalive */ break; case RANAL_MSG_IMMEDIATE: lib_parse(&kranal_lib, &msg->ram_u.immediate.raim_hdr, conn); break; case RANAL_MSG_PUT_REQ: lib_parse(&kranal_lib, &msg->ram_u.putreq.raprm_hdr, conn); if (conn->rac_rxmsg == NULL) /* lib_parse matched something */ break; tx = kranal_new_tx_msg(0, RANAL_MSG_PUT_NAK); if (tx == NULL) break; tx->tx_msg.ram_u.racm_cookie = msg->msg_u.putreq.raprm_cookie; kranal_post_fma(conn, tx); break; case RANAL_MSG_PUT_NAK: tx = kranal_match_reply(conn, RANAL_MSG_PUT_REQ, msg->ram_u.completion.racm_cookie); if (tx == NULL) break; LASSERT (tx->tx_buftype == RANAL_BUF_PHYS_MAPPED || tx->tx_buftype == RANAL_BUF_VIRT_MAPPED); kranal_tx_done(tx, -ENOENT); /* no match */ break; case RANAL_MSG_PUT_ACK: tx = kranal_match_reply(conn, RANAL_MSG_PUT_REQ, msg->ram_u.putack.rapam_src_cookie); if (tx == NULL) break; kranal_rdma(tx, RANAL_MSG_PUT_DONE, &msg->ram_u.putack.rapam_desc, msg->msg_u.putack.rapam_desc.rard_nob, msg->ram_u.putack.rapam_dst_cookie); break; case RANAL_MSG_PUT_DONE: tx = kranal_match_reply(conn, RANAL_MSG_PUT_ACK, msg->ram_u.completion.racm_cookie); if (tx == NULL) break; LASSERT (tx->tx_buftype == RANAL_BUF_PHYS_MAPPED || tx->tx_buftype == RANAL_BUF_VIRT_MAPPED); kranal_tx_done(tx, 0); break; case RANAL_MSG_GET_REQ: lib_parse(&kranal_lib, &msg->ram_u.getreq.ragm_hdr, conn); if (conn->rac_rxmsg == NULL) /* lib_parse matched something */ break; tx = kranal_new_tx_msg(0, RANAL_MSG_GET_NAK); if (tx == NULL) break; tx->tx_msg.ram_u.racm_cookie = msg->msg_u.getreq.ragm_cookie; kranal_post_fma(conn, tx); break; case RANAL_MSG_GET_NAK: tx = kranal_match_reply(conn, RANAL_MSG_GET_REQ, msg->ram_u.completion.racm_cookie); if (tx == NULL) break; LASSERT (tx->tx_buftype == RANAL_BUF_PHYS_MAPPED || tx->tx_buftype == RANAL_BUF_VIRT_MAPPED); kranal_tx_done(tx, -ENOENT); /* no match */ break; case RANAL_MSG_GET_DONE: tx = kranal_match_reply(conn, RANAL_MSG_GET_REQ, msg->ram_u.completion.racm_cookie); if (tx == NULL) break; LASSERT (tx->tx_buftype == RANAL_BUF_PHYS_MAPPED || tx->tx_buftype == RANAL_BUF_VIRT_MAPPED); kranal_tx_done(tx, 0); break; } out: if (conn->rac_msg != NULL) kranal_consume_rxmsg(conn, NULL, 0); return 1; } int kranal_scheduler (void *arg) { kra_device_t *dev = (kra_device_t *)arg; wait_queue_t wait; char name[16]; kra_conn_t *conn; unsigned long flags; int rc; int i; __u32 cqid; int did_something; int busy_loops = 0; snprintf(name, sizeof(name), "kranal_sd_%02ld", dev->rad_idx); kportal_daemonize(name); kportal_blockallsigs(); init_waitqueue_entry(&wait, current); spin_lock_irqsave(&dev->rad_lock, flags); while (!kranal_data.kra_shutdown) { /* Safe: kra_shutdown only set when quiescent */ if (busy_loops++ >= RANAL_RESCHED) { spin_unlock_irqrestore(&dev->rad_lock, flags); our_cond_resched(); busy_loops = 0; spin_lock_irqsave(&dev->rad_lock, flags); } did_something = 0; if (dev->rad_ready) { dev->rad_ready = 0; spin_unlock_irqrestore(&dev->rad_lock, flags); rrc = RapkCQDone(dev->rad_rdma_cq, &cqid, &event_type); LASSERT (rrc == RAP_SUCCESS || rrc == RAP_NOT_DONE); LASSERT ((event_type & RAPK_CQ_EVENT_OVERRUN) == 0); if (rrc == RAP_SUCCESS) { kranal_process_rdmaq(cqid); did_something = 1; } rrc = RapkCQDone(dev->rad_fma_cq, &cqid, &event_type); LASSERT (rrc == RAP_SUCCESS || rrc == RAP_NOT_DONE); if (rrc == RAP_SUCCESS) { if ((event_type & RAPK_CQ_EVENT_OVERRUN) != 0) kranal_schedule_dev(dev); else kranal_schedule_cqid(cqid); did_something = 1; } spin_lock_irqsave(&dev->rad_lock, flags); /* If there were no completions to handle, I leave * rad_ready clear. NB I cleared it BEFORE I checked * the completion queues since I'm racing with the * device callback. */ if (did_something) dev->rad_ready = 1; } if (!list_empty(&dev->rad_connq)) { conn = list_entry(dev->rad_connq.next, kra_conn_t, rac_schedlist); list_del(&conn->rac_schedlist); spin_unlock_irqrestore(&dev->rad_lock, flags); LASSERT (conn->rac_scheduled); resched = kranal_process_fmaq(conn); resched |= kranal_process_receives(conn); did_something = 1; spin_lock_irqsave(&dev->rad_lock, flags); if (resched) list_add_tail(&conn->rac_schedlist, &dev->rad_connq); } if (did_something) continue; add_wait_queue(&dev->rad_waitq, &wait); set_current_state(TASK_INTERRUPTIBLE); spin_unlock_irqrestore(&dev->rad_lock, flags); busy_loops = 0; schedule(); set_current_state(TASK_RUNNING); remove_wait_queue(&dev->rad_waitq, &wait); spin_lock_irqsave(&dev->rad_lock, flags); } spin_unlock_irqrestore(&dev->rad_lock, flags); kranal_thread_fini(); return 0; } lib_nal_t kranal_lib = { libnal_data: &kranal_data, /* NAL private data */ libnal_send: kranal_send, libnal_send_pages: kranal_send_pages, libnal_recv: kranal_recv, libnal_recv_pages: kranal_recv_pages, libnal_dist: kranal_dist };