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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.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-msg.c
*
* Message decoding, parsing and finalizing routines
*/
#define DEBUG_SUBSYSTEM S_LNET
#include "../../include/linux/lnet/lib-lnet.h"
void
lnet_build_unlink_event(lnet_libmd_t *md, lnet_event_t *ev)
{
memset(ev, 0, sizeof(*ev));
ev->status = 0;
ev->unlinked = 1;
ev->type = LNET_EVENT_UNLINK;
lnet_md_deconstruct(md, &ev->md);
lnet_md2handle(&ev->md_handle, md);
}
/*
* Don't need any lock, must be called after lnet_commit_md
*/
void
lnet_build_msg_event(lnet_msg_t *msg, lnet_event_kind_t ev_type)
{
lnet_hdr_t *hdr = &msg->msg_hdr;
lnet_event_t *ev = &msg->msg_ev;
LASSERT(!msg->msg_routing);
ev->type = ev_type;
if (ev_type == LNET_EVENT_SEND) {
/* event for active message */
ev->target.nid = le64_to_cpu(hdr->dest_nid);
ev->target.pid = le32_to_cpu(hdr->dest_pid);
ev->initiator.nid = LNET_NID_ANY;
ev->initiator.pid = the_lnet.ln_pid;
ev->sender = LNET_NID_ANY;
} else {
/* event for passive message */
ev->target.pid = hdr->dest_pid;
ev->target.nid = hdr->dest_nid;
ev->initiator.pid = hdr->src_pid;
ev->initiator.nid = hdr->src_nid;
ev->rlength = hdr->payload_length;
ev->sender = msg->msg_from;
ev->mlength = msg->msg_wanted;
ev->offset = msg->msg_offset;
}
switch (ev_type) {
default:
LBUG();
case LNET_EVENT_PUT: /* passive PUT */
ev->pt_index = hdr->msg.put.ptl_index;
ev->match_bits = hdr->msg.put.match_bits;
ev->hdr_data = hdr->msg.put.hdr_data;
return;
case LNET_EVENT_GET: /* passive GET */
ev->pt_index = hdr->msg.get.ptl_index;
ev->match_bits = hdr->msg.get.match_bits;
ev->hdr_data = 0;
return;
case LNET_EVENT_ACK: /* ACK */
ev->match_bits = hdr->msg.ack.match_bits;
ev->mlength = hdr->msg.ack.mlength;
return;
case LNET_EVENT_REPLY: /* REPLY */
return;
case LNET_EVENT_SEND: /* active message */
if (msg->msg_type == LNET_MSG_PUT) {
ev->pt_index = le32_to_cpu(hdr->msg.put.ptl_index);
ev->match_bits = le64_to_cpu(hdr->msg.put.match_bits);
ev->offset = le32_to_cpu(hdr->msg.put.offset);
ev->mlength =
ev->rlength = le32_to_cpu(hdr->payload_length);
ev->hdr_data = le64_to_cpu(hdr->msg.put.hdr_data);
} else {
LASSERT(msg->msg_type == LNET_MSG_GET);
ev->pt_index = le32_to_cpu(hdr->msg.get.ptl_index);
ev->match_bits = le64_to_cpu(hdr->msg.get.match_bits);
ev->mlength =
ev->rlength = le32_to_cpu(hdr->msg.get.sink_length);
ev->offset = le32_to_cpu(hdr->msg.get.src_offset);
ev->hdr_data = 0;
}
return;
}
}
void
lnet_msg_commit(lnet_msg_t *msg, int cpt)
{
struct lnet_msg_container *container = the_lnet.ln_msg_containers[cpt];
lnet_counters_t *counters = the_lnet.ln_counters[cpt];
/* routed message can be committed for both receiving and sending */
LASSERT(!msg->msg_tx_committed);
if (msg->msg_sending) {
LASSERT(!msg->msg_receiving);
msg->msg_tx_cpt = cpt;
msg->msg_tx_committed = 1;
if (msg->msg_rx_committed) { /* routed message REPLY */
LASSERT(msg->msg_onactivelist);
return;
}
} else {
LASSERT(!msg->msg_sending);
msg->msg_rx_cpt = cpt;
msg->msg_rx_committed = 1;
}
LASSERT(!msg->msg_onactivelist);
msg->msg_onactivelist = 1;
list_add(&msg->msg_activelist, &container->msc_active);
counters->msgs_alloc++;
if (counters->msgs_alloc > counters->msgs_max)
counters->msgs_max = counters->msgs_alloc;
}
static void
lnet_msg_decommit_tx(lnet_msg_t *msg, int status)
{
lnet_counters_t *counters;
lnet_event_t *ev = &msg->msg_ev;
LASSERT(msg->msg_tx_committed);
if (status)
goto out;
counters = the_lnet.ln_counters[msg->msg_tx_cpt];
switch (ev->type) {
default: /* routed message */
LASSERT(msg->msg_routing);
LASSERT(msg->msg_rx_committed);
LASSERT(!ev->type);
counters->route_length += msg->msg_len;
counters->route_count++;
goto out;
case LNET_EVENT_PUT:
/* should have been decommitted */
LASSERT(!msg->msg_rx_committed);
/* overwritten while sending ACK */
LASSERT(msg->msg_type == LNET_MSG_ACK);
msg->msg_type = LNET_MSG_PUT; /* fix type */
break;
case LNET_EVENT_SEND:
LASSERT(!msg->msg_rx_committed);
if (msg->msg_type == LNET_MSG_PUT)
counters->send_length += msg->msg_len;
break;
case LNET_EVENT_GET:
LASSERT(msg->msg_rx_committed);
/*
* overwritten while sending reply, we should never be
* here for optimized GET
*/
LASSERT(msg->msg_type == LNET_MSG_REPLY);
msg->msg_type = LNET_MSG_GET; /* fix type */
break;
}
counters->send_count++;
out:
lnet_return_tx_credits_locked(msg);
msg->msg_tx_committed = 0;
}
static void
lnet_msg_decommit_rx(lnet_msg_t *msg, int status)
{
lnet_counters_t *counters;
lnet_event_t *ev = &msg->msg_ev;
LASSERT(!msg->msg_tx_committed); /* decommitted or never committed */
LASSERT(msg->msg_rx_committed);
if (status)
goto out;
counters = the_lnet.ln_counters[msg->msg_rx_cpt];
switch (ev->type) {
default:
LASSERT(!ev->type);
LASSERT(msg->msg_routing);
goto out;
case LNET_EVENT_ACK:
LASSERT(msg->msg_type == LNET_MSG_ACK);
break;
case LNET_EVENT_GET:
/*
* type is "REPLY" if it's an optimized GET on passive side,
* because optimized GET will never be committed for sending,
* so message type wouldn't be changed back to "GET" by
* lnet_msg_decommit_tx(), see details in lnet_parse_get()
*/
LASSERT(msg->msg_type == LNET_MSG_REPLY ||
msg->msg_type == LNET_MSG_GET);
counters->send_length += msg->msg_wanted;
break;
case LNET_EVENT_PUT:
LASSERT(msg->msg_type == LNET_MSG_PUT);
break;
case LNET_EVENT_REPLY:
/*
* type is "GET" if it's an optimized GET on active side,
* see details in lnet_create_reply_msg()
*/
LASSERT(msg->msg_type == LNET_MSG_GET ||
msg->msg_type == LNET_MSG_REPLY);
break;
}
counters->recv_count++;
if (ev->type == LNET_EVENT_PUT || ev->type == LNET_EVENT_REPLY)
counters->recv_length += msg->msg_wanted;
out:
lnet_return_rx_credits_locked(msg);
msg->msg_rx_committed = 0;
}
void
lnet_msg_decommit(lnet_msg_t *msg, int cpt, int status)
{
int cpt2 = cpt;
LASSERT(msg->msg_tx_committed || msg->msg_rx_committed);
LASSERT(msg->msg_onactivelist);
if (msg->msg_tx_committed) { /* always decommit for sending first */
LASSERT(cpt == msg->msg_tx_cpt);
lnet_msg_decommit_tx(msg, status);
}
if (msg->msg_rx_committed) {
/* forwarding msg committed for both receiving and sending */
if (cpt != msg->msg_rx_cpt) {
lnet_net_unlock(cpt);
cpt2 = msg->msg_rx_cpt;
lnet_net_lock(cpt2);
}
lnet_msg_decommit_rx(msg, status);
}
list_del(&msg->msg_activelist);
msg->msg_onactivelist = 0;
the_lnet.ln_counters[cpt2]->msgs_alloc--;
if (cpt2 != cpt) {
lnet_net_unlock(cpt2);
lnet_net_lock(cpt);
}
}
void
lnet_msg_attach_md(lnet_msg_t *msg, lnet_libmd_t *md,
unsigned int offset, unsigned int mlen)
{
/* NB: @offset and @len are only useful for receiving */
/*
* Here, we attach the MD on lnet_msg and mark it busy and
* decrementing its threshold. Come what may, the lnet_msg "owns"
* the MD until a call to lnet_msg_detach_md or lnet_finalize()
* signals completion.
*/
LASSERT(!msg->msg_routing);
msg->msg_md = md;
if (msg->msg_receiving) { /* committed for receiving */
msg->msg_offset = offset;
msg->msg_wanted = mlen;
}
md->md_refcount++;
if (md->md_threshold != LNET_MD_THRESH_INF) {
LASSERT(md->md_threshold > 0);
md->md_threshold--;
}
/* build umd in event */
lnet_md2handle(&msg->msg_ev.md_handle, md);
lnet_md_deconstruct(md, &msg->msg_ev.md);
}
void
lnet_msg_detach_md(lnet_msg_t *msg, int status)
{
lnet_libmd_t *md = msg->msg_md;
int unlink;
/* Now it's safe to drop my caller's ref */
md->md_refcount--;
LASSERT(md->md_refcount >= 0);
unlink = lnet_md_unlinkable(md);
if (md->md_eq) {
msg->msg_ev.status = status;
msg->msg_ev.unlinked = unlink;
lnet_eq_enqueue_event(md->md_eq, &msg->msg_ev);
}
if (unlink)
lnet_md_unlink(md);
msg->msg_md = NULL;
}
static int
lnet_complete_msg_locked(lnet_msg_t *msg, int cpt)
{
lnet_handle_wire_t ack_wmd;
int rc;
int status = msg->msg_ev.status;
LASSERT(msg->msg_onactivelist);
if (!status && msg->msg_ack) {
/* Only send an ACK if the PUT completed successfully */
lnet_msg_decommit(msg, cpt, 0);
msg->msg_ack = 0;
lnet_net_unlock(cpt);
LASSERT(msg->msg_ev.type == LNET_EVENT_PUT);
LASSERT(!msg->msg_routing);
ack_wmd = msg->msg_hdr.msg.put.ack_wmd;
lnet_prep_send(msg, LNET_MSG_ACK, msg->msg_ev.initiator, 0, 0);
msg->msg_hdr.msg.ack.dst_wmd = ack_wmd;
msg->msg_hdr.msg.ack.match_bits = msg->msg_ev.match_bits;
msg->msg_hdr.msg.ack.mlength = cpu_to_le32(msg->msg_ev.mlength);
/*
* NB: we probably want to use NID of msg::msg_from as 3rd
* parameter (router NID) if it's routed message
*/
rc = lnet_send(msg->msg_ev.target.nid, msg, LNET_NID_ANY);
lnet_net_lock(cpt);
/*
* NB: message is committed for sending, we should return
* on success because LND will finalize this message later.
*
* Also, there is possibility that message is committed for
* sending and also failed before delivering to LND,
* i.e: ENOMEM, in that case we can't fall through either
* because CPT for sending can be different with CPT for
* receiving, so we should return back to lnet_finalize()
* to make sure we are locking the correct partition.
*/
return rc;
} else if (!status && /* OK so far */
(msg->msg_routing && !msg->msg_sending)) {
/* not forwarded */
LASSERT(!msg->msg_receiving); /* called back recv already */
lnet_net_unlock(cpt);
rc = lnet_send(LNET_NID_ANY, msg, LNET_NID_ANY);
lnet_net_lock(cpt);
/*
* NB: message is committed for sending, we should return
* on success because LND will finalize this message later.
*
* Also, there is possibility that message is committed for
* sending and also failed before delivering to LND,
* i.e: ENOMEM, in that case we can't fall through either:
* - The rule is message must decommit for sending first if
* the it's committed for both sending and receiving
* - CPT for sending can be different with CPT for receiving,
* so we should return back to lnet_finalize() to make
* sure we are locking the correct partition.
*/
return rc;
}
lnet_msg_decommit(msg, cpt, status);
lnet_msg_free(msg);
return 0;
}
void
lnet_finalize(lnet_ni_t *ni, lnet_msg_t *msg, int status)
{
struct lnet_msg_container *container;
int my_slot;
int cpt;
int rc;
int i;
LASSERT(!in_interrupt());
if (!msg)
return;
msg->msg_ev.status = status;
if (msg->msg_md) {
cpt = lnet_cpt_of_cookie(msg->msg_md->md_lh.lh_cookie);
lnet_res_lock(cpt);
lnet_msg_detach_md(msg, status);
lnet_res_unlock(cpt);
}
again:
rc = 0;
if (!msg->msg_tx_committed && !msg->msg_rx_committed) {
/* not committed to network yet */
LASSERT(!msg->msg_onactivelist);
lnet_msg_free(msg);
return;
}
/*
* NB: routed message can be committed for both receiving and sending,
* we should finalize in LIFO order and keep counters correct.
* (finalize sending first then finalize receiving)
*/
cpt = msg->msg_tx_committed ? msg->msg_tx_cpt : msg->msg_rx_cpt;
lnet_net_lock(cpt);
container = the_lnet.ln_msg_containers[cpt];
list_add_tail(&msg->msg_list, &container->msc_finalizing);
/*
* Recursion breaker. Don't complete the message here if I am (or
* enough other threads are) already completing messages
*/
my_slot = -1;
for (i = 0; i < container->msc_nfinalizers; i++) {
if (container->msc_finalizers[i] == current)
break;
if (my_slot < 0 && !container->msc_finalizers[i])
my_slot = i;
}
if (i < container->msc_nfinalizers || my_slot < 0) {
lnet_net_unlock(cpt);
return;
}
container->msc_finalizers[my_slot] = current;
while (!list_empty(&container->msc_finalizing)) {
msg = list_entry(container->msc_finalizing.next,
lnet_msg_t, msg_list);
list_del(&msg->msg_list);
/*
* NB drops and regains the lnet lock if it actually does
* anything, so my finalizing friends can chomp along too
*/
rc = lnet_complete_msg_locked(msg, cpt);
if (rc)
break;
}
if (unlikely(!list_empty(&the_lnet.ln_delay_rules))) {
lnet_net_unlock(cpt);
lnet_delay_rule_check();
lnet_net_lock(cpt);
}
container->msc_finalizers[my_slot] = NULL;
lnet_net_unlock(cpt);
if (rc)
goto again;
}
EXPORT_SYMBOL(lnet_finalize);
void
lnet_msg_container_cleanup(struct lnet_msg_container *container)
{
int count = 0;
if (!container->msc_init)
return;
while (!list_empty(&container->msc_active)) {
lnet_msg_t *msg = list_entry(container->msc_active.next,
lnet_msg_t, msg_activelist);
LASSERT(msg->msg_onactivelist);
msg->msg_onactivelist = 0;
list_del(&msg->msg_activelist);
lnet_msg_free(msg);
count++;
}
if (count > 0)
CERROR("%d active msg on exit\n", count);
if (container->msc_finalizers) {
LIBCFS_FREE(container->msc_finalizers,
container->msc_nfinalizers *
sizeof(*container->msc_finalizers));
container->msc_finalizers = NULL;
}
container->msc_init = 0;
}
int
lnet_msg_container_setup(struct lnet_msg_container *container, int cpt)
{
container->msc_init = 1;
INIT_LIST_HEAD(&container->msc_active);
INIT_LIST_HEAD(&container->msc_finalizing);
/* number of CPUs */
container->msc_nfinalizers = cfs_cpt_weight(lnet_cpt_table(), cpt);
LIBCFS_CPT_ALLOC(container->msc_finalizers, lnet_cpt_table(), cpt,
container->msc_nfinalizers *
sizeof(*container->msc_finalizers));
if (!container->msc_finalizers) {
CERROR("Failed to allocate message finalizers\n");
lnet_msg_container_cleanup(container);
return -ENOMEM;
}
return 0;
}
void
lnet_msg_containers_destroy(void)
{
struct lnet_msg_container *container;
int i;
if (!the_lnet.ln_msg_containers)
return;
cfs_percpt_for_each(container, i, the_lnet.ln_msg_containers)
lnet_msg_container_cleanup(container);
cfs_percpt_free(the_lnet.ln_msg_containers);
the_lnet.ln_msg_containers = NULL;
}
int
lnet_msg_containers_create(void)
{
struct lnet_msg_container *container;
int rc;
int i;
the_lnet.ln_msg_containers = cfs_percpt_alloc(lnet_cpt_table(),
sizeof(*container));
if (!the_lnet.ln_msg_containers) {
CERROR("Failed to allocate cpu-partition data for network\n");
return -ENOMEM;
}
cfs_percpt_for_each(container, i, the_lnet.ln_msg_containers) {
rc = lnet_msg_container_setup(container, i);
if (rc) {
lnet_msg_containers_destroy();
return rc;
}
}
return 0;
}
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