* 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 [sun.com URL with a
- * copy of GPLv2].
+ * 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
* 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.
*/
/*
#include <lnet/lib-lnet.h>
+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,
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;
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);
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,
{
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);
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;
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);
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)
{
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;
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
git://git.whamcloud.com / fs / lustre-release.git / blobdiff