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* 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, see
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* 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.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* lnet/lnet/lib-me.c
*
* Match Entry management routines
*/
#define DEBUG_SUBSYSTEM S_LNET
#include <linux/lnet/lib-lnet.h>
/**
* Create and attach a match entry to the match list of \a portal. The new
* ME is empty, i.e. not associated with a memory descriptor. LNetMDAttach()
* can be used to attach a MD to an empty ME.
*
* \param portal The portal table index where the ME should be attached.
* \param match_id Specifies the match criteria for the process ID of
* the requester. The constants LNET_PID_ANY and LNET_NID_ANY can be
* used to wildcard either of the identifiers in the lnet_process_id_t
* structure.
* \param match_bits,ignore_bits Specify the match criteria to apply
* to the match bits in the incoming request. The ignore bits are used
* to mask out insignificant bits in the incoming match bits. The resulting
* bits are then compared to the ME's match bits to determine if the
* incoming request meets the match criteria.
* \param unlink Indicates whether the ME should be unlinked when the memory
* descriptor associated with it is unlinked (Note that the check for
* unlinking a ME only occurs when the memory descriptor is unlinked.).
* Valid values are LNET_RETAIN and LNET_UNLINK.
* \param pos Indicates whether the new ME should be prepended or
* appended to the match list. Allowed constants: LNET_INS_BEFORE,
* LNET_INS_AFTER.
* \param handle On successful returns, a handle to the newly created ME
* object is saved here. This handle can be used later in LNetMEInsert(),
* LNetMEUnlink(), or LNetMDAttach() functions.
*
* \retval 0 On success.
* \retval -EINVAL If \a portal is invalid.
* \retval -ENOMEM If new ME object cannot be allocated.
*/
int
LNetMEAttach(unsigned int portal,
lnet_process_id_t match_id,
__u64 match_bits, __u64 ignore_bits,
lnet_unlink_t unlink, lnet_ins_pos_t pos,
lnet_handle_me_t *handle)
{
struct lnet_match_table *mtable;
struct lnet_me *me;
struct list_head *head;
LASSERT(the_lnet.ln_init);
LASSERT(the_lnet.ln_refcount > 0);
if ((int)portal >= the_lnet.ln_nportals)
return -EINVAL;
mtable = lnet_mt_of_attach(portal, match_id,
match_bits, ignore_bits, pos);
if (mtable == NULL) /* can't match portal type */
return -EPERM;
me = lnet_me_alloc();
if (me == NULL)
return -ENOMEM;
lnet_res_lock(mtable->mt_cpt);
me->me_portal = portal;
me->me_match_id = match_id;
me->me_match_bits = match_bits;
me->me_ignore_bits = ignore_bits;
me->me_unlink = unlink;
me->me_md = NULL;
lnet_res_lh_initialize(the_lnet.ln_me_containers[mtable->mt_cpt],
&me->me_lh);
if (ignore_bits != 0)
head = &mtable->mt_mhash[LNET_MT_HASH_IGNORE];
else
head = lnet_mt_match_head(mtable, match_id, match_bits);
me->me_pos = head - &mtable->mt_mhash[0];
if (pos == LNET_INS_AFTER || pos == LNET_INS_LOCAL)
list_add_tail(&me->me_list, head);
else
list_add(&me->me_list, head);
lnet_me2handle(handle, me);
lnet_res_unlock(mtable->mt_cpt);
return 0;
}
EXPORT_SYMBOL(LNetMEAttach);
/**
* Create and a match entry and insert it before or after the ME pointed to by
* \a current_meh. The new ME is empty, i.e. not associated with a memory
* descriptor. LNetMDAttach() can be used to attach a MD to an empty ME.
*
* This function is identical to LNetMEAttach() except for the position
* where the new ME is inserted.
*
* \param current_meh A handle for a ME. The new ME will be inserted
* immediately before or immediately after this ME.
* \param match_id,match_bits,ignore_bits,unlink,pos,handle See the discussion
* for LNetMEAttach().
*
* \retval 0 On success.
* \retval -ENOMEM If new ME object cannot be allocated.
* \retval -ENOENT If \a current_meh does not point to a valid match entry.
*/
int
LNetMEInsert(lnet_handle_me_t current_meh,
lnet_process_id_t match_id,
__u64 match_bits, __u64 ignore_bits,
lnet_unlink_t unlink, lnet_ins_pos_t pos,
lnet_handle_me_t *handle)
{
struct lnet_me *current_me;
struct lnet_me *new_me;
struct lnet_portal *ptl;
int cpt;
LASSERT(the_lnet.ln_init);
LASSERT(the_lnet.ln_refcount > 0);
if (pos == LNET_INS_LOCAL)
return -EPERM;
new_me = lnet_me_alloc();
if (new_me == NULL)
return -ENOMEM;
cpt = lnet_cpt_of_cookie(current_meh.cookie);
lnet_res_lock(cpt);
current_me = lnet_handle2me(¤t_meh);
if (current_me == NULL) {
lnet_me_free_locked(new_me);
lnet_res_unlock(cpt);
return -ENOENT;
}
LASSERT(current_me->me_portal < the_lnet.ln_nportals);
ptl = the_lnet.ln_portals[current_me->me_portal];
if (lnet_ptl_is_unique(ptl)) {
/* nosense to insertion on unique portal */
lnet_me_free_locked(new_me);
lnet_res_unlock(cpt);
return -EPERM;
}
new_me->me_pos = current_me->me_pos;
new_me->me_portal = current_me->me_portal;
new_me->me_match_id = match_id;
new_me->me_match_bits = match_bits;
new_me->me_ignore_bits = ignore_bits;
new_me->me_unlink = unlink;
new_me->me_md = NULL;
lnet_res_lh_initialize(the_lnet.ln_me_containers[cpt], &new_me->me_lh);
if (pos == LNET_INS_AFTER)
list_add(&new_me->me_list, ¤t_me->me_list);
else
list_add_tail(&new_me->me_list, ¤t_me->me_list);
lnet_me2handle(handle, new_me);
lnet_res_unlock(cpt);
return 0;
}
EXPORT_SYMBOL(LNetMEInsert);
/**
* Unlink a match entry from its match list.
*
* This operation also releases any resources associated with the ME. If a
* memory descriptor is attached to the ME, then it will be unlinked as well
* and an unlink event will be generated. It is an error to use the ME handle
* after calling LNetMEUnlink().
*
* \param meh A handle for the ME to be unlinked.
*
* \retval 0 On success.
* \retval -ENOENT If \a meh does not point to a valid ME.
* \see LNetMDUnlink() for the discussion on delivering unlink event.
*/
int
LNetMEUnlink(lnet_handle_me_t meh)
{
lnet_me_t *me;
lnet_libmd_t *md;
lnet_event_t ev;
int cpt;
LASSERT(the_lnet.ln_init);
LASSERT(the_lnet.ln_refcount > 0);
cpt = lnet_cpt_of_cookie(meh.cookie);
lnet_res_lock(cpt);
me = lnet_handle2me(&meh);
if (me == NULL) {
lnet_res_unlock(cpt);
return -ENOENT;
}
md = me->me_md;
if (md != NULL &&
md->md_eq != NULL &&
md->md_refcount == 0) {
lnet_build_unlink_event(md, &ev);
lnet_eq_enqueue_event(md->md_eq, &ev);
}
lnet_me_unlink(me);
lnet_res_unlock(cpt);
return 0;
}
EXPORT_SYMBOL(LNetMEUnlink);
/* call with lnet_res_lock please */
void
lnet_me_unlink(lnet_me_t *me)
{
list_del(&me->me_list);
if (me->me_md != NULL) {
lnet_libmd_t *md = me->me_md;
/* detach MD from portal of this ME */
lnet_ptl_detach_md(me, md);
lnet_md_unlink(md);
}
lnet_res_lh_invalidate(&me->me_lh);
lnet_me_free_locked(me);
}
#if 0
static void
lib_me_dump(lnet_me_t *me)
{
CWARN("Match Entry %p ("LPX64")\n", me,
me->me_lh.lh_cookie);
CWARN("\tMatch/Ignore\t= %016lx / %016lx\n",
me->me_match_bits, me->me_ignore_bits);
CWARN("\tMD\t= %p\n", me->md);
CWARN("\tprev\t= %p\n",
list_entry(me->me_list.prev, lnet_me_t, me_list));
CWARN("\tnext\t= %p\n",
list_entry(me->me_list.next, lnet_me_t, me_list));
}
#endif
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