diff options
Diffstat (limited to 'drivers/staging/lustre/lnet/lnet/lib-me.c')
| -rw-r--r-- | drivers/staging/lustre/lnet/lnet/lib-me.c | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lnet/lnet/lib-me.c b/drivers/staging/lustre/lnet/lnet/lib-me.c new file mode 100644 index 000000000000..0081075cabee --- /dev/null +++ b/drivers/staging/lustre/lnet/lnet/lib-me.c @@ -0,0 +1,297 @@ +/* + * 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 |