diff options
Diffstat (limited to 'drivers/staging/lustre/lnet/lnet/lib-me.c')
| -rw-r--r-- | drivers/staging/lustre/lnet/lnet/lib-me.c | 274 |
1 files changed, 0 insertions, 274 deletions
diff --git a/drivers/staging/lustre/lnet/lnet/lib-me.c b/drivers/staging/lustre/lnet/lnet/lib-me.c deleted file mode 100644 index 672e37bdd045..000000000000 --- a/drivers/staging/lustre/lnet/lnet/lib-me.c +++ /dev/null @@ -1,274 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * 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.gnu.org/licenses/gpl-2.0.html - * - * 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 - * 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, - struct lnet_process_id match_id, - __u64 match_bits, __u64 ignore_bits, - enum lnet_unlink unlink, enum lnet_ins_pos pos, - struct lnet_handle_me *handle) -{ - struct lnet_match_table *mtable; - struct lnet_me *me; - struct list_head *head; - - 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) /* can't match portal type */ - return -EPERM; - - me = kzalloc(sizeof(*me), GFP_NOFS); - if (!me) - 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) - 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(struct lnet_handle_me current_meh, - struct lnet_process_id match_id, - __u64 match_bits, __u64 ignore_bits, - enum lnet_unlink unlink, enum lnet_ins_pos pos, - struct lnet_handle_me *handle) -{ - struct lnet_me *current_me; - struct lnet_me *new_me; - struct lnet_portal *ptl; - int cpt; - - LASSERT(the_lnet.ln_refcount > 0); - - if (pos == LNET_INS_LOCAL) - return -EPERM; - - new_me = kzalloc(sizeof(*new_me), GFP_NOFS); - if (!new_me) - return -ENOMEM; - - cpt = lnet_cpt_of_cookie(current_meh.cookie); - - lnet_res_lock(cpt); - - current_me = lnet_handle2me(¤t_meh); - if (!current_me) { - kfree(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 */ - kfree(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(struct lnet_handle_me meh) -{ - struct lnet_me *me; - struct lnet_libmd *md; - struct lnet_event ev; - int cpt; - - LASSERT(the_lnet.ln_refcount > 0); - - cpt = lnet_cpt_of_cookie(meh.cookie); - lnet_res_lock(cpt); - - me = lnet_handle2me(&meh); - if (!me) { - lnet_res_unlock(cpt); - return -ENOENT; - } - - md = me->me_md; - if (md) { - md->md_flags |= LNET_MD_FLAG_ABORTED; - if (md->md_eq && !md->md_refcount) { - 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(struct lnet_me *me) -{ - list_del(&me->me_list); - - if (me->me_md) { - struct lnet_libmd *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); - kfree(me); -} |