X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lnet%2Flnet%2Flib-me.c;h=d62c9703ee22a846dad9494a4feb7167c22ca300;hb=a296e9433919a6d709ae7826ecc5310d9e2d1365;hp=90131a10c92f601d6bcefff90c50b253dc7affe6;hpb=6869932b552ac705f411de3362f01bd50c1f6f7d;p=fs%2Flustre-release.git diff --git a/lnet/lnet/lib-me.c b/lnet/lnet/lib-me.c index 90131a1..d62c970 100644 --- a/lnet/lnet/lib-me.c +++ b/lnet/lnet/lib-me.c @@ -26,7 +26,7 @@ * GPL HEADER END */ /* - * Copyright 2008 Sun Microsystems, Inc. All rights reserved + * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. */ /* @@ -42,6 +42,90 @@ #include +static int +lnet_me_match_portal(lnet_portal_t *ptl, lnet_process_id_t id, + __u64 match_bits, __u64 ignore_bits) +{ + cfs_list_t *mhash = NULL; + int unique; + + LASSERT (!(lnet_portal_is_unique(ptl) && + lnet_portal_is_wildcard(ptl))); + + /* prefer to check w/o any lock */ + unique = lnet_match_is_unique(id, match_bits, ignore_bits); + if (likely(lnet_portal_is_unique(ptl) || + lnet_portal_is_wildcard(ptl))) + goto match; + + /* unset, new portal */ + if (unique) { + mhash = lnet_portal_mhash_alloc(); + if (mhash == NULL) + return -ENOMEM; + } + + LNET_LOCK(); + if (lnet_portal_is_unique(ptl) || + lnet_portal_is_wildcard(ptl)) { + /* someone set it before me */ + if (mhash != NULL) + lnet_portal_mhash_free(mhash); + LNET_UNLOCK(); + goto match; + } + + /* still not set */ + LASSERT (ptl->ptl_mhash == NULL); + if (unique) { + ptl->ptl_mhash = mhash; + lnet_portal_setopt(ptl, LNET_PTL_MATCH_UNIQUE); + } else { + lnet_portal_setopt(ptl, LNET_PTL_MATCH_WILDCARD); + } + LNET_UNLOCK(); + return 0; + + match: + if (lnet_portal_is_unique(ptl) && !unique) + return -EPERM; + + if (lnet_portal_is_wildcard(ptl) && unique) + return -EPERM; + + return 0; +} + +/** + * 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, @@ -49,14 +133,22 @@ LNetMEAttach(unsigned int portal, lnet_unlink_t unlink, lnet_ins_pos_t pos, lnet_handle_me_t *handle) { - lnet_me_t *me; + lnet_me_t *me; + lnet_portal_t *ptl; + cfs_list_t *head; + int rc; LASSERT (the_lnet.ln_init); LASSERT (the_lnet.ln_refcount > 0); - if (portal >= the_lnet.ln_nportals) + if ((int)portal >= the_lnet.ln_nportals) return -EINVAL; + ptl = &the_lnet.ln_portals[portal]; + rc = lnet_me_match_portal(ptl, match_id, match_bits, ignore_bits); + if (rc != 0) + return rc; + me = lnet_me_alloc(); if (me == NULL) return -ENOMEM; @@ -71,11 +163,13 @@ LNetMEAttach(unsigned int portal, me->me_md = NULL; lnet_initialise_handle (&me->me_lh, LNET_COOKIE_TYPE_ME); + head = lnet_portal_me_head(portal, match_id, match_bits); + LASSERT (head != NULL); if (pos == LNET_INS_AFTER) - list_add_tail(&me->me_list, &(the_lnet.ln_portals[portal].ptl_ml)); + cfs_list_add_tail(&me->me_list, head); else - list_add(&me->me_list, &(the_lnet.ln_portals[portal].ptl_ml)); + cfs_list_add(&me->me_list, head); lnet_me2handle(handle, me); @@ -84,6 +178,23 @@ LNetMEAttach(unsigned int portal, return 0; } +/** + * 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, @@ -93,6 +204,7 @@ LNetMEInsert(lnet_handle_me_t current_meh, { lnet_me_t *current_me; lnet_me_t *new_me; + lnet_portal_t *ptl; LASSERT (the_lnet.ln_init); LASSERT (the_lnet.ln_refcount > 0); @@ -111,6 +223,16 @@ LNetMEInsert(lnet_handle_me_t current_meh, return -ENOENT; } + LASSERT (current_me->me_portal < the_lnet.ln_nportals); + + ptl = &the_lnet.ln_portals[current_me->me_portal]; + if (lnet_portal_is_unique(ptl)) { + /* nosense to insertion on unique portal */ + lnet_me_free (new_me); + LNET_UNLOCK(); + return -EPERM; + } + new_me->me_portal = current_me->me_portal; new_me->me_match_id = match_id; new_me->me_match_bits = match_bits; @@ -121,9 +243,9 @@ LNetMEInsert(lnet_handle_me_t current_meh, lnet_initialise_handle (&new_me->me_lh, LNET_COOKIE_TYPE_ME); if (pos == LNET_INS_AFTER) - list_add(&new_me->me_list, ¤t_me->me_list); + cfs_list_add(&new_me->me_list, ¤t_me->me_list); else - list_add_tail(&new_me->me_list, ¤t_me->me_list); + cfs_list_add_tail(&new_me->me_list, ¤t_me->me_list); lnet_me2handle(handle, new_me); @@ -132,6 +254,20 @@ LNetMEInsert(lnet_handle_me_t current_meh, return 0; } +/** + * 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) { @@ -168,7 +304,7 @@ LNetMEUnlink(lnet_handle_me_t meh) void lnet_me_unlink(lnet_me_t *me) { - list_del (&me->me_list); + cfs_list_del (&me->me_list); if (me->me_md != NULL) { me->me_md->md_me = NULL; @@ -191,8 +327,8 @@ lib_me_dump(lnet_me_t *me) CWARN("\tMD\t= %p\n", me->md); CWARN("\tprev\t= %p\n", - list_entry(me->me_list.prev, lnet_me_t, me_list)); + cfs_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)); + cfs_list_entry(me->me_list.next, lnet_me_t, me_list)); } #endif