+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program 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 version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2011, 2012, Whamcloud, Inc.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lnet/lnet/lib-ptl.c
+ *
+ * portal & match routines
+ *
+ * Author: liang@whamcloud.com
+ */
+
+#define DEBUG_SUBSYSTEM S_LNET
+
+#include <lnet/lib-lnet.h>
+
+int
+lnet_ptl_type_match(struct lnet_portal *ptl, lnet_process_id_t match_id,
+ __u64 mbits, __u64 ignore_bits)
+{
+ int unique;
+
+ unique = ignore_bits == 0 &&
+ match_id.nid != LNET_NID_ANY &&
+ match_id.pid != LNET_PID_ANY;
+
+ LASSERT(!lnet_ptl_is_unique(ptl) || !lnet_ptl_is_wildcard(ptl));
+
+ /* prefer to check w/o any lock */
+ if (likely(lnet_ptl_is_unique(ptl) || lnet_ptl_is_wildcard(ptl)))
+ goto match;
+
+ /* unset, new portal */
+ LNET_LOCK();
+ /* check again with lock */
+ if (unlikely(lnet_ptl_is_unique(ptl) || lnet_ptl_is_wildcard(ptl))) {
+ LNET_UNLOCK();
+ goto match;
+ }
+
+ /* still not set */
+ if (unique)
+ lnet_ptl_setopt(ptl, LNET_PTL_MATCH_UNIQUE);
+ else
+ lnet_ptl_setopt(ptl, LNET_PTL_MATCH_WILDCARD);
+
+ LNET_UNLOCK();
+
+ return 1;
+
+ match:
+ if ((lnet_ptl_is_unique(ptl) && !unique) ||
+ (lnet_ptl_is_wildcard(ptl) && unique))
+ return 0;
+ return 1;
+}
+
+static int
+lnet_try_match_md(int index, int op_mask, lnet_process_id_t src,
+ unsigned int rlength, unsigned int roffset,
+ __u64 match_bits, lnet_libmd_t *md, lnet_msg_t *msg,
+ unsigned int *mlength_out, unsigned int *offset_out)
+{
+ /* ALWAYS called holding the LNET_LOCK, and can't LNET_UNLOCK;
+ * lnet_match_blocked_msg() relies on this to avoid races */
+ unsigned int offset;
+ unsigned int mlength;
+ lnet_me_t *me = md->md_me;
+
+ /* mismatched MD op */
+ if ((md->md_options & op_mask) == 0)
+ return LNET_MATCHMD_NONE;
+
+ /* MD exhausted */
+ if (lnet_md_exhausted(md))
+ return LNET_MATCHMD_NONE;
+
+ /* mismatched ME nid/pid? */
+ if (me->me_match_id.nid != LNET_NID_ANY &&
+ me->me_match_id.nid != src.nid)
+ return LNET_MATCHMD_NONE;
+
+ if (me->me_match_id.pid != LNET_PID_ANY &&
+ me->me_match_id.pid != src.pid)
+ return LNET_MATCHMD_NONE;
+
+ /* mismatched ME matchbits? */
+ if (((me->me_match_bits ^ match_bits) & ~me->me_ignore_bits) != 0)
+ return LNET_MATCHMD_NONE;
+
+ /* Hurrah! This _is_ a match; check it out... */
+
+ if ((md->md_options & LNET_MD_MANAGE_REMOTE) == 0)
+ offset = md->md_offset;
+ else
+ offset = roffset;
+
+ if ((md->md_options & LNET_MD_MAX_SIZE) != 0) {
+ mlength = md->md_max_size;
+ LASSERT(md->md_offset + mlength <= md->md_length);
+ } else {
+ mlength = md->md_length - offset;
+ }
+
+ if (rlength <= mlength) { /* fits in allowed space */
+ mlength = rlength;
+ } else if ((md->md_options & LNET_MD_TRUNCATE) == 0) {
+ /* this packet _really_ is too big */
+ CERROR("Matching packet from %s, match "LPU64
+ " length %d too big: %d left, %d allowed\n",
+ libcfs_id2str(src), match_bits, rlength,
+ md->md_length - offset, mlength);
+
+ return LNET_MATCHMD_DROP;
+ }
+
+ /* Commit to this ME/MD */
+ CDEBUG(D_NET, "Incoming %s index %x from %s of "
+ "length %d/%d into md "LPX64" [%d] + %d\n",
+ (op_mask == LNET_MD_OP_PUT) ? "put" : "get",
+ index, libcfs_id2str(src), mlength, rlength,
+ md->md_lh.lh_cookie, md->md_niov, offset);
+
+ lnet_commit_md(md, msg);
+ md->md_offset = offset + mlength;
+
+ /* NB Caller will set ev.type and ev.hdr_data */
+ msg->msg_ev.initiator = src;
+ msg->msg_ev.pt_index = index;
+ msg->msg_ev.match_bits = match_bits;
+ msg->msg_ev.rlength = rlength;
+ msg->msg_ev.mlength = mlength;
+ msg->msg_ev.offset = offset;
+
+ lnet_md_deconstruct(md, &msg->msg_ev.md);
+ lnet_md2handle(&msg->msg_ev.md_handle, md);
+
+ *offset_out = offset;
+ *mlength_out = mlength;
+
+ /* Auto-unlink NOW, so the ME gets unlinked if required.
+ * We bumped md->md_refcount above so the MD just gets flagged
+ * for unlink when it is finalized. */
+ if ((md->md_flags & LNET_MD_FLAG_AUTO_UNLINK) != 0 &&
+ lnet_md_exhausted(md)) {
+ lnet_md_unlink(md);
+ }
+
+ return LNET_MATCHMD_OK;
+}
+
+int
+lnet_match_md(int index, int op_mask, lnet_process_id_t src,
+ unsigned int rlength, unsigned int roffset,
+ __u64 match_bits, lnet_msg_t *msg,
+ unsigned int *mlength_out, unsigned int *offset_out,
+ lnet_libmd_t **md_out)
+{
+ struct lnet_portal *ptl = the_lnet.ln_portals[index];
+ cfs_list_t *head;
+ lnet_me_t *me;
+ lnet_me_t *tmp;
+ lnet_libmd_t *md;
+ int rc;
+
+ CDEBUG(D_NET, "Request from %s of length %d into portal %d "
+ "MB="LPX64"\n", libcfs_id2str(src), rlength, index, match_bits);
+
+ if (index < 0 || index >= the_lnet.ln_nportals) {
+ CERROR("Invalid portal %d not in [0-%d]\n",
+ index, the_lnet.ln_nportals);
+ return LNET_MATCHMD_DROP;
+ }
+
+ head = lnet_ptl_me_head(index, src, match_bits);
+ if (head == NULL) /* nobody posted anything on this portal */
+ goto out;
+
+ cfs_list_for_each_entry_safe(me, tmp, head, me_list) {
+ md = me->me_md;
+
+ /* ME attached but MD not attached yet */
+ if (md == NULL)
+ continue;
+
+ LASSERT(me == md->md_me);
+
+ rc = lnet_try_match_md(index, op_mask, src, rlength,
+ roffset, match_bits, md, msg,
+ mlength_out, offset_out);
+ switch (rc) {
+ default:
+ LBUG();
+
+ case LNET_MATCHMD_NONE:
+ continue;
+
+ case LNET_MATCHMD_OK:
+ *md_out = md;
+ return LNET_MATCHMD_OK;
+
+ case LNET_MATCHMD_DROP:
+ return LNET_MATCHMD_DROP;
+ }
+ /* not reached */
+ }
+
+ out:
+ if (op_mask == LNET_MD_OP_GET ||
+ !lnet_ptl_is_lazy(ptl))
+ return LNET_MATCHMD_DROP;
+
+ return LNET_MATCHMD_NONE;
+}
+
+/* called with LNET_LOCK held */
+void
+lnet_match_blocked_msg(lnet_libmd_t *md)
+{
+ CFS_LIST_HEAD (drops);
+ CFS_LIST_HEAD (matches);
+ cfs_list_t *tmp;
+ cfs_list_t *entry;
+ lnet_msg_t *msg;
+ struct lnet_portal *ptl;
+ lnet_me_t *me = md->md_me;
+
+ LASSERT(me->me_portal < (unsigned int)the_lnet.ln_nportals);
+
+ ptl = the_lnet.ln_portals[me->me_portal];
+ if (!lnet_ptl_is_lazy(ptl)) {
+ LASSERT(cfs_list_empty(&ptl->ptl_msgq));
+ return;
+ }
+
+ LASSERT(md->md_refcount == 0); /* a brand new MD */
+
+ cfs_list_for_each_safe(entry, tmp, &ptl->ptl_msgq) {
+ int rc;
+ int index;
+ unsigned int mlength;
+ unsigned int offset;
+ lnet_hdr_t *hdr;
+ lnet_process_id_t src;
+
+ msg = cfs_list_entry(entry, lnet_msg_t, msg_list);
+
+ LASSERT(msg->msg_delayed);
+
+ hdr = &msg->msg_hdr;
+ index = hdr->msg.put.ptl_index;
+
+ src.nid = hdr->src_nid;
+ src.pid = hdr->src_pid;
+
+ rc = lnet_try_match_md(index, LNET_MD_OP_PUT, src,
+ hdr->payload_length,
+ hdr->msg.put.offset,
+ hdr->msg.put.match_bits,
+ md, msg, &mlength, &offset);
+
+ if (rc == LNET_MATCHMD_NONE)
+ continue;
+
+ /* Hurrah! This _is_ a match */
+ cfs_list_del(&msg->msg_list);
+ ptl->ptl_msgq_version++;
+
+ if (rc == LNET_MATCHMD_OK) {
+ cfs_list_add_tail(&msg->msg_list, &matches);
+
+ CDEBUG(D_NET, "Resuming delayed PUT from %s portal %d "
+ "match "LPU64" offset %d length %d.\n",
+ libcfs_id2str(src),
+ hdr->msg.put.ptl_index,
+ hdr->msg.put.match_bits,
+ hdr->msg.put.offset,
+ hdr->payload_length);
+ } else {
+ LASSERT(rc == LNET_MATCHMD_DROP);
+
+ cfs_list_add_tail(&msg->msg_list, &drops);
+ }
+
+ if (lnet_md_exhausted(md))
+ break;
+ }
+
+ LNET_UNLOCK();
+
+ lnet_drop_delayed_msg_list(&drops, "Bad match");
+ lnet_recv_delayed_msg_list(&matches);
+
+ LNET_LOCK();
+}
+
+void
+lnet_ptl_cleanup(struct lnet_portal *ptl)
+{
+ lnet_me_t *me;
+ int j;
+
+ LASSERT(cfs_list_empty(&ptl->ptl_msgq));
+ LASSERT(cfs_list_empty(&ptl->ptl_mlist));
+
+ if (ptl->ptl_mhash == NULL) /* uninitialized portal */
+ return;
+
+ /* cleanup ME */
+ while (!cfs_list_empty(&ptl->ptl_mlist)) {
+ me = cfs_list_entry(ptl->ptl_mlist.next,
+ lnet_me_t, me_list);
+ CERROR("Active wildcard ME %p on exit\n", me);
+ cfs_list_del(&me->me_list);
+ lnet_me_free(me);
+ }
+
+ for (j = 0; j < LNET_PORTAL_HASH_SIZE; j++) {
+ while (!cfs_list_empty(&ptl->ptl_mhash[j])) {
+ me = cfs_list_entry(ptl->ptl_mhash[j].next,
+ lnet_me_t, me_list);
+ CERROR("Active unique ME %p on exit\n", me);
+ cfs_list_del(&me->me_list);
+ lnet_me_free(me);
+ }
+ }
+
+ LIBCFS_FREE(ptl->ptl_mhash,
+ LNET_PORTAL_HASH_SIZE * sizeof(ptl->ptl_mhash[0]));
+ ptl->ptl_mhash = NULL; /* mark it as finalized */
+}
+
+int
+lnet_ptl_setup(struct lnet_portal *ptl, int index)
+{
+ cfs_list_t *mhash;
+ int i;
+
+ ptl->ptl_index = index;
+ CFS_INIT_LIST_HEAD(&ptl->ptl_msgq);
+ CFS_INIT_LIST_HEAD(&ptl->ptl_mlist);
+
+ LIBCFS_ALLOC(mhash, sizeof(*mhash) * LNET_PORTAL_HASH_SIZE);
+ if (mhash == NULL) {
+ CERROR("Failed to create match table for portal %d\n", index);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < LNET_PORTAL_HASH_SIZE; i++)
+ CFS_INIT_LIST_HEAD(&mhash[i]);
+
+ ptl->ptl_mhash = mhash; /* initialized */
+
+ return 0;
+}
+
+void
+lnet_portals_destroy(void)
+{
+ int i;
+
+ if (the_lnet.ln_portals == NULL)
+ return;
+
+ for (i = 0; i < the_lnet.ln_nportals; i++)
+ lnet_ptl_cleanup(the_lnet.ln_portals[i]);
+
+ cfs_array_free(the_lnet.ln_portals);
+ the_lnet.ln_portals = NULL;
+}
+
+int
+lnet_portals_create(void)
+{
+ int size;
+ int i;
+
+ size = sizeof(struct lnet_portal);
+
+ the_lnet.ln_nportals = MAX_PORTALS;
+ the_lnet.ln_portals = cfs_array_alloc(the_lnet.ln_nportals, size);
+ if (the_lnet.ln_portals == NULL) {
+ CERROR("Failed to allocate portals table\n");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < the_lnet.ln_nportals; i++) {
+ if (lnet_ptl_setup(the_lnet.ln_portals[i], i)) {
+ lnet_portals_destroy();
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * Turn on the lazy portal attribute. Use with caution!
+ *
+ * This portal attribute only affects incoming PUT requests to the portal,
+ * and is off by default. By default, if there's no matching MD for an
+ * incoming PUT request, it is simply dropped. With the lazy attribute on,
+ * such requests are queued indefinitely until either a matching MD is
+ * posted to the portal or the lazy attribute is turned off.
+ *
+ * It would prevent dropped requests, however it should be regarded as the
+ * last line of defense - i.e. users must keep a close watch on active
+ * buffers on a lazy portal and once it becomes too low post more buffers as
+ * soon as possible. This is because delayed requests usually have detrimental
+ * effects on underlying network connections. A few delayed requests often
+ * suffice to bring an underlying connection to a complete halt, due to flow
+ * control mechanisms.
+ *
+ * There's also a DOS attack risk. If users don't post match-all MDs on a
+ * lazy portal, a malicious peer can easily stop a service by sending some
+ * PUT requests with match bits that won't match any MD. A routed server is
+ * especially vulnerable since the connections to its neighbor routers are
+ * shared among all clients.
+ *
+ * \param portal Index of the portal to enable the lazy attribute on.
+ *
+ * \retval 0 On success.
+ * \retval -EINVAL If \a portal is not a valid index.
+ */
+int
+LNetSetLazyPortal(int portal)
+{
+ struct lnet_portal *ptl;
+
+ if (portal < 0 || portal >= the_lnet.ln_nportals)
+ return -EINVAL;
+
+ CDEBUG(D_NET, "Setting portal %d lazy\n", portal);
+ ptl = the_lnet.ln_portals[portal];
+
+ LNET_LOCK();
+ lnet_ptl_setopt(ptl, LNET_PTL_LAZY);
+ LNET_UNLOCK();
+
+ return 0;
+}
+
+/**
+ * Turn off the lazy portal attribute. Delayed requests on the portal,
+ * if any, will be all dropped when this function returns.
+ *
+ * \param portal Index of the portal to disable the lazy attribute on.
+ *
+ * \retval 0 On success.
+ * \retval -EINVAL If \a portal is not a valid index.
+ */
+int
+LNetClearLazyPortal(int portal)
+{
+ struct lnet_portal *ptl;
+ CFS_LIST_HEAD (zombies);
+
+ if (portal < 0 || portal >= the_lnet.ln_nportals)
+ return -EINVAL;
+
+ ptl = the_lnet.ln_portals[portal];
+
+ LNET_LOCK();
+
+ if (!lnet_ptl_is_lazy(ptl)) {
+ LNET_UNLOCK();
+ return 0;
+ }
+
+ if (the_lnet.ln_shutdown)
+ CWARN("Active lazy portal %d on exit\n", portal);
+ else
+ CDEBUG(D_NET, "clearing portal %d lazy\n", portal);
+
+ /* grab all the blocked messages atomically */
+ cfs_list_splice_init(&ptl->ptl_msgq, &zombies);
+
+ ptl->ptl_msgq_version++;
+ lnet_ptl_unsetopt(ptl, LNET_PTL_LAZY);
+
+ LNET_UNLOCK();
+
+ lnet_drop_delayed_msg_list(&zombies, "Clearing lazy portal attr");
+
+ return 0;
+}
git://git.whamcloud.com / fs / lustre-release.git / commitdiff