-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
+/*
+ * GPL HEADER START
*
- * lib/lib-md.c
- * Memory Descriptor management routines
+ * 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.
*
- * Copyright (c) 2001-2003 Cluster File Systems, Inc.
+ * 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).
*
- * This file is part of Lustre, http://www.lustre.org
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
- * 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.
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
*
- * 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.
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
*
- * 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.
+ * Copyright (c) 2012, 2013, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lnet/lnet/lib-md.c
+ *
+ * Memory Descriptor management routines
*/
#define DEBUG_SUBSYSTEM S_LNET
#include <lnet/lib-lnet.h>
-/* must be called with LNET_LOCK held */
+/* must be called with lnet_res_lock held */
void
lnet_md_unlink(lnet_libmd_t *md)
{
/* Disassociate from ME (if any), and unlink it if it was created
* with LNET_UNLINK */
if (me != NULL) {
- me->me_md = NULL;
+ /* detach MD from portal */
+ lnet_ptl_detach_md(me, md);
if (me->me_unlink == LNET_UNLINK)
lnet_me_unlink(me);
}
- /* emsure all future handle lookups fail */
- lnet_invalidate_handle(&md->md_lh);
+ /* ensure all future handle lookups fail */
+ lnet_res_lh_invalidate(&md->md_lh);
}
if (md->md_refcount != 0) {
CDEBUG(D_NET, "Unlinking md %p\n", md);
if (md->md_eq != NULL) {
- md->md_eq->eq_refcount--;
- LASSERT (md->md_eq->eq_refcount >= 0);
- }
+ int cpt = lnet_cpt_of_cookie(md->md_lh.lh_cookie);
+
+ LASSERT(*md->md_eq->eq_refs[cpt] > 0);
+ (*md->md_eq->eq_refs[cpt])--;
+ }
- list_del (&md->md_list);
- lnet_md_free(md);
+ LASSERT(!list_empty(&md->md_list));
+ list_del_init(&md->md_list);
+ lnet_md_free(md);
}
-/* must be called with LNET_LOCK held */
static int
-lib_md_build(lnet_libmd_t *lmd, lnet_md_t *umd, int unlink)
+lnet_md_build(lnet_libmd_t *lmd, lnet_md_t *umd, int unlink)
{
- lnet_eq_t *eq = NULL;
int i;
unsigned int niov;
int total_length = 0;
- /* NB we are passed an allocated, but uninitialised/active md.
- * if we return success, caller may lnet_md_unlink() it.
- * otherwise caller may only lnet_md_free() it.
- */
-
- if (!LNetHandleIsEqual (umd->eq_handle, LNET_EQ_NONE)) {
- eq = lnet_handle2eq(&umd->eq_handle);
- if (eq == NULL)
- return -ENOENT;
- }
-
- /* This implementation doesn't know how to create START events or
- * disable END events. Best to LASSERT our caller is compliant so
- * we find out quickly... */
- /* TODO - reevaluate what should be here in light of
- * the removal of the start and end events
- * maybe there we shouldn't even allow LNET_EQ_NONE!)
- LASSERT (eq == NULL);
- */
-
lmd->md_me = NULL;
lmd->md_start = umd->start;
lmd->md_offset = 0;
lmd->md_max_size = umd->max_size;
lmd->md_options = umd->options;
lmd->md_user_ptr = umd->user_ptr;
- lmd->md_eq = eq;
+ lmd->md_eq = NULL;
lmd->md_threshold = umd->threshold;
lmd->md_refcount = 0;
lmd->md_flags = (unlink == LNET_UNLINK) ? LNET_MD_FLAG_AUTO_UNLINK : 0;
memcpy(lmd->md_iov.iov, umd->start,
niov * sizeof (lmd->md_iov.iov[0]));
- for (i = 0; i < niov; i++) {
+ for (i = 0; i < (int)niov; i++) {
/* We take the base address on trust */
if (lmd->md_iov.iov[i].iov_len <= 0) /* invalid length */
return -EINVAL;
return -EINVAL;
} else if ((umd->options & LNET_MD_KIOV) != 0) {
-#ifndef __KERNEL__
- return -EINVAL;
-#else
lmd->md_niov = niov = umd->length;
memcpy(lmd->md_iov.kiov, umd->start,
niov * sizeof (lmd->md_iov.kiov[0]));
- for (i = 0; i < niov; i++) {
+ for (i = 0; i < (int)niov; i++) {
/* We take the page pointer on trust */
if (lmd->md_iov.kiov[i].kiov_offset +
- lmd->md_iov.kiov[i].kiov_len > CFS_PAGE_SIZE )
+ lmd->md_iov.kiov[i].kiov_len > PAGE_CACHE_SIZE)
return -EINVAL; /* invalid length */
total_length += lmd->md_iov.kiov[i].kiov_len;
(umd->max_size < 0 ||
umd->max_size > total_length)) // illegal max_size
return -EINVAL;
-#endif
} else { /* contiguous */
lmd->md_length = umd->length;
lmd->md_niov = niov = 1;
if ((umd->options & LNET_MD_MAX_SIZE) != 0 && /* max size used */
(umd->max_size < 0 ||
- umd->max_size > umd->length)) // illegal max_size
+ umd->max_size > (int)umd->length)) // illegal max_size
return -EINVAL;
}
- if (eq != NULL)
- eq->eq_refcount++;
-
- /* It's good; let handle2md succeed and add to active mds */
- lnet_initialise_handle (&lmd->md_lh, LNET_COOKIE_TYPE_MD);
- list_add (&lmd->md_list, &the_lnet.ln_active_mds);
+ return 0;
+}
- return 0;
+/* must be called with resource lock held */
+static int
+lnet_md_link(lnet_libmd_t *md, lnet_handle_eq_t eq_handle, int cpt)
+{
+ struct lnet_res_container *container = the_lnet.ln_md_containers[cpt];
+
+ /* NB we are passed an allocated, but inactive md.
+ * if we return success, caller may lnet_md_unlink() it.
+ * otherwise caller may only lnet_md_free() it.
+ */
+ /* This implementation doesn't know how to create START events or
+ * disable END events. Best to LASSERT our caller is compliant so
+ * we find out quickly... */
+ /* TODO - reevaluate what should be here in light of
+ * the removal of the start and end events
+ * maybe there we shouldn't even allow LNET_EQ_NONE!)
+ * LASSERT (eq == NULL);
+ */
+ if (!LNetHandleIsInvalid(eq_handle)) {
+ md->md_eq = lnet_handle2eq(&eq_handle);
+
+ if (md->md_eq == NULL)
+ return -ENOENT;
+
+ (*md->md_eq->eq_refs[cpt])++;
+ }
+
+ lnet_res_lh_initialize(container, &md->md_lh);
+
+ LASSERT(list_empty(&md->md_list));
+ list_add(&md->md_list, &container->rec_active);
+
+ return 0;
}
-/* must be called with LNET_LOCK held */
+/* must be called with lnet_res_lock held */
void
lnet_md_deconstruct(lnet_libmd_t *lmd, lnet_md_t *umd)
{
lnet_eq2handle(&umd->eq_handle, lmd->md_eq);
}
+static int
+lnet_md_validate(lnet_md_t *umd)
+{
+ if (umd->start == NULL && umd->length != 0) {
+ CERROR("MD start pointer can not be NULL with length %u\n",
+ umd->length);
+ return -EINVAL;
+ }
+
+ if ((umd->options & (LNET_MD_KIOV | LNET_MD_IOVEC)) != 0 &&
+ umd->length > LNET_MAX_IOV) {
+ CERROR("Invalid option: too many fragments %u, %d max\n",
+ umd->length, LNET_MAX_IOV);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
+ * Create a memory descriptor and attach it to a ME
+ *
+ * \param meh A handle for a ME to associate the new MD with.
+ * \param umd Provides initial values for the user-visible parts of a MD.
+ * Other than its use for initialization, there is no linkage between this
+ * structure and the MD maintained by the LNet.
+ * \param unlink A flag to indicate whether the MD is automatically unlinked
+ * when it becomes inactive, either because the operation threshold drops to
+ * zero or because the available memory becomes less than \a umd.max_size.
+ * (Note that the check for unlinking a MD only occurs after the completion
+ * of a successful operation on the MD.) The value LNET_UNLINK enables auto
+ * unlinking; the value LNET_RETAIN disables it.
+ * \param handle On successful returns, a handle to the newly created MD is
+ * saved here. This handle can be used later in LNetMDUnlink().
+ *
+ * \retval 0 On success.
+ * \retval -EINVAL If \a umd is not valid.
+ * \retval -ENOMEM If new MD cannot be allocated.
+ * \retval -ENOENT Either \a meh or \a umd.eq_handle does not point to a
+ * valid object. Note that it's OK to supply a NULL \a umd.eq_handle by
+ * calling LNetInvalidateHandle() on it.
+ * \retval -EBUSY If the ME pointed to by \a meh is already associated with
+ * a MD.
+ */
int
LNetMDAttach(lnet_handle_me_t meh, lnet_md_t umd,
- lnet_unlink_t unlink, lnet_handle_md_t *handle)
+ lnet_unlink_t unlink, lnet_handle_md_t *handle)
{
- lnet_me_t *me;
- lnet_libmd_t *md;
- int rc;
+ struct list_head matches = LIST_HEAD_INIT(matches);
+ struct list_head drops = LIST_HEAD_INIT(drops);
+ struct lnet_me *me;
+ struct lnet_libmd *md;
+ int cpt;
+ int rc;
- LASSERT (the_lnet.ln_init);
LASSERT (the_lnet.ln_refcount > 0);
-
- if ((umd.options & (LNET_MD_KIOV | LNET_MD_IOVEC)) != 0 &&
- umd.length > LNET_MAX_IOV) /* too many fragments */
+
+ if (lnet_md_validate(&umd) != 0)
return -EINVAL;
+ if ((umd.options & (LNET_MD_OP_GET | LNET_MD_OP_PUT)) == 0) {
+ CERROR("Invalid option: no MD_OP set\n");
+ return -EINVAL;
+ }
+
md = lnet_md_alloc(&umd);
if (md == NULL)
return -ENOMEM;
- LNET_LOCK();
+ rc = lnet_md_build(md, &umd, unlink);
+ cpt = lnet_cpt_of_cookie(meh.cookie);
- me = lnet_handle2me(&meh);
- if (me == NULL) {
- rc = -ENOENT;
- } else if (me->me_md != NULL) {
- rc = -EBUSY;
- } else {
- rc = lib_md_build(md, &umd, unlink);
- if (rc == 0) {
- me->me_md = md;
- md->md_me = me;
+ lnet_res_lock(cpt);
+ if (rc != 0)
+ goto failed;
- lnet_md2handle(handle, md);
+ me = lnet_handle2me(&meh);
+ if (me == NULL)
+ rc = -ENOENT;
+ else if (me->me_md != NULL)
+ rc = -EBUSY;
+ else
+ rc = lnet_md_link(md, umd.eq_handle, cpt);
- /* check if this MD matches any blocked msgs */
- lnet_match_blocked_msg(md); /* expects LNET_LOCK held */
+ if (rc != 0)
+ goto failed;
- LNET_UNLOCK();
- return (0);
- }
- }
+ /* attach this MD to portal of ME and check if it matches any
+ * blocked msgs on this portal */
+ lnet_ptl_attach_md(me, md, &matches, &drops);
+
+ lnet_md2handle(handle, md);
+
+ lnet_res_unlock(cpt);
+
+ lnet_drop_delayed_msg_list(&drops, "Bad match");
+ lnet_recv_delayed_msg_list(&matches);
- lnet_md_free (md);
+ return 0;
- LNET_UNLOCK();
- return (rc);
+ failed:
+ lnet_md_free(md);
+
+ lnet_res_unlock(cpt);
+ return rc;
}
+EXPORT_SYMBOL(LNetMDAttach);
+/**
+ * Create a "free floating" memory descriptor - a MD that is not associated
+ * with a ME. Such MDs are usually used in LNetPut() and LNetGet() operations.
+ *
+ * \param umd,unlink See the discussion for LNetMDAttach().
+ * \param handle On successful returns, a handle to the newly created MD is
+ * saved here. This handle can be used later in LNetMDUnlink(), LNetPut(),
+ * and LNetGet() operations.
+ *
+ * \retval 0 On success.
+ * \retval -EINVAL If \a umd is not valid.
+ * \retval -ENOMEM If new MD cannot be allocated.
+ * \retval -ENOENT \a umd.eq_handle does not point to a valid EQ. Note that
+ * it's OK to supply a NULL \a umd.eq_handle by calling
+ * LNetInvalidateHandle() on it.
+ */
int
LNetMDBind(lnet_md_t umd, lnet_unlink_t unlink, lnet_handle_md_t *handle)
{
- lnet_libmd_t *md;
- int rc;
+ lnet_libmd_t *md;
+ int cpt;
+ int rc;
- LASSERT (the_lnet.ln_init);
LASSERT (the_lnet.ln_refcount > 0);
-
- if ((umd.options & (LNET_MD_KIOV | LNET_MD_IOVEC)) != 0 &&
- umd.length > LNET_MAX_IOV) /* too many fragments */
+
+ if (lnet_md_validate(&umd) != 0)
+ return -EINVAL;
+
+ if ((umd.options & (LNET_MD_OP_GET | LNET_MD_OP_PUT)) != 0) {
+ CERROR("Invalid option: GET|PUT illegal on active MDs\n");
return -EINVAL;
+ }
md = lnet_md_alloc(&umd);
if (md == NULL)
return -ENOMEM;
- LNET_LOCK();
+ rc = lnet_md_build(md, &umd, unlink);
- rc = lib_md_build(md, &umd, unlink);
+ cpt = lnet_res_lock_current();
+ if (rc != 0)
+ goto failed;
- if (rc == 0) {
- lnet_md2handle(handle, md);
+ rc = lnet_md_link(md, umd.eq_handle, cpt);
+ if (rc != 0)
+ goto failed;
- LNET_UNLOCK();
- return (0);
- }
+ lnet_md2handle(handle, md);
+
+ lnet_res_unlock(cpt);
+ return 0;
- lnet_md_free (md);
+ failed:
+ lnet_md_free(md);
- LNET_UNLOCK();
- return (rc);
+ lnet_res_unlock(cpt);
+ return rc;
}
+EXPORT_SYMBOL(LNetMDBind);
+/**
+ * Unlink the memory descriptor from any ME it may be linked to and release
+ * the internal resources associated with it. As a result, active messages
+ * associated with the MD may get aborted.
+ *
+ * This function does not free the memory region associated with the MD;
+ * i.e., the memory the user allocated for this MD. If the ME associated with
+ * this MD is not NULL and was created with auto unlink enabled, the ME is
+ * unlinked as well (see LNetMEAttach()).
+ *
+ * Explicitly unlinking a MD via this function call has the same behavior as
+ * a MD that has been automatically unlinked, except that no LNET_EVENT_UNLINK
+ * is generated in the latter case.
+ *
+ * An unlinked event can be reported in two ways:
+ * - If there's no pending operations on the MD, it's unlinked immediately
+ * and an LNET_EVENT_UNLINK event is logged before this function returns.
+ * - Otherwise, the MD is only marked for deletion when this function
+ * returns, and the unlinked event will be piggybacked on the event of
+ * the completion of the last operation by setting the unlinked field of
+ * the event. No dedicated LNET_EVENT_UNLINK event is generated.
+ *
+ * Note that in both cases the unlinked field of the event is always set; no
+ * more event will happen on the MD after such an event is logged.
+ *
+ * \param mdh A handle for the MD to be unlinked.
+ *
+ * \retval 0 On success.
+ * \retval -ENOENT If \a mdh does not point to a valid MD object.
+ */
int
LNetMDUnlink (lnet_handle_md_t mdh)
{
- lnet_event_t ev;
- lnet_libmd_t *md;
+ lnet_event_t ev;
+ lnet_libmd_t *md;
+ int cpt;
- LASSERT (the_lnet.ln_init);
- LASSERT (the_lnet.ln_refcount > 0);
-
- LNET_LOCK();
+ LASSERT(the_lnet.ln_refcount > 0);
+
+ cpt = lnet_cpt_of_cookie(mdh.cookie);
+ lnet_res_lock(cpt);
- md = lnet_handle2md(&mdh);
- if (md == NULL) {
- LNET_UNLOCK();
+ md = lnet_handle2md(&mdh);
+ if (md == NULL) {
+ lnet_res_unlock(cpt);
return -ENOENT;
}
- /* If the MD is busy, lnet_md_unlink just marks it for deletion, and
- * when the NAL is done, the completion event flags that the MD was
- * unlinked. Otherwise, we enqueue an event now... */
-
- if (md->md_eq != NULL &&
- md->md_refcount == 0) {
- memset(&ev, 0, sizeof(ev));
-
- ev.type = LNET_EVENT_UNLINK;
- ev.status = 0;
- ev.unlinked = 1;
- lnet_md_deconstruct(md, &ev.md);
- lnet_md2handle(&ev.md_handle, md);
-
- lnet_enq_event_locked(md->md_eq, &ev);
- }
+ md->md_flags |= LNET_MD_FLAG_ABORTED;
+ /* If the MD is busy, lnet_md_unlink just marks it for deletion, and
+ * when the LND is done, the completion event flags that the MD was
+ * unlinked. Otherwise, we enqueue an event now... */
+ if (md->md_eq != NULL && md->md_refcount == 0) {
+ lnet_build_unlink_event(md, &ev);
+ lnet_eq_enqueue_event(md->md_eq, &ev);
+ }
lnet_md_unlink(md);
- LNET_UNLOCK();
- return 0;
+ lnet_res_unlock(cpt);
+ return 0;
}
-
+EXPORT_SYMBOL(LNetMDUnlink);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff