diff options
Diffstat (limited to 'net/rxrpc/conn_client.c')
| -rw-r--r-- | net/rxrpc/conn_client.c | 206 |
1 files changed, 120 insertions, 86 deletions
diff --git a/net/rxrpc/conn_client.c b/net/rxrpc/conn_client.c index e8dea0d49e7f..eb2157680399 100644 --- a/net/rxrpc/conn_client.c +++ b/net/rxrpc/conn_client.c @@ -31,22 +31,25 @@ * may freely grant available channels to new calls and calls may be * waiting on it for channels to become available. * - * The connection is on the rxrpc_active_client_conns list which is kept + * The connection is on the rxnet->active_client_conns list which is kept * in activation order for culling purposes. * * rxrpc_nr_active_client_conns is held incremented also. * - * (4) CULLED - The connection got summarily culled to try and free up + * (4) UPGRADE - As for ACTIVE, but only one call may be in progress and is + * being used to probe for service upgrade. + * + * (5) CULLED - The connection got summarily culled to try and free up * capacity. Calls currently in progress on the connection are allowed to * continue, but new calls will have to wait. There can be no waiters in * this state - the conn would have to go to the WAITING state instead. * - * (5) IDLE - The connection has no calls in progress upon it and must have + * (6) IDLE - The connection has no calls in progress upon it and must have * been exposed to the world (ie. the EXPOSED flag must be set). When it * expires, the EXPOSED flag is cleared and the connection transitions to * the INACTIVE state. * - * The connection is on the rxrpc_idle_client_conns list which is kept in + * The connection is on the rxnet->idle_client_conns list which is kept in * order of how soon they'll expire. * * There are flags of relevance to the cache: @@ -85,27 +88,13 @@ __read_mostly unsigned int rxrpc_reap_client_connections = 900; __read_mostly unsigned int rxrpc_conn_idle_client_expiry = 2 * 60 * HZ; __read_mostly unsigned int rxrpc_conn_idle_client_fast_expiry = 2 * HZ; -static unsigned int rxrpc_nr_client_conns; -static unsigned int rxrpc_nr_active_client_conns; -static __read_mostly bool rxrpc_kill_all_client_conns; - -static DEFINE_SPINLOCK(rxrpc_client_conn_cache_lock); -static DEFINE_SPINLOCK(rxrpc_client_conn_discard_mutex); -static LIST_HEAD(rxrpc_waiting_client_conns); -static LIST_HEAD(rxrpc_active_client_conns); -static LIST_HEAD(rxrpc_idle_client_conns); - /* * We use machine-unique IDs for our client connections. */ DEFINE_IDR(rxrpc_client_conn_ids); static DEFINE_SPINLOCK(rxrpc_conn_id_lock); -static void rxrpc_cull_active_client_conns(void); -static void rxrpc_discard_expired_client_conns(struct work_struct *); - -static DECLARE_DELAYED_WORK(rxrpc_client_conn_reap, - rxrpc_discard_expired_client_conns); +static void rxrpc_cull_active_client_conns(struct rxrpc_net *); /* * Get a connection ID and epoch for a client connection from the global pool. @@ -116,6 +105,7 @@ static DECLARE_DELAYED_WORK(rxrpc_client_conn_reap, static int rxrpc_get_client_connection_id(struct rxrpc_connection *conn, gfp_t gfp) { + struct rxrpc_net *rxnet = conn->params.local->rxnet; int id; _enter(""); @@ -131,7 +121,7 @@ static int rxrpc_get_client_connection_id(struct rxrpc_connection *conn, spin_unlock(&rxrpc_conn_id_lock); idr_preload_end(); - conn->proto.epoch = rxrpc_epoch; + conn->proto.epoch = rxnet->epoch; conn->proto.cid = id << RXRPC_CIDSHIFT; set_bit(RXRPC_CONN_HAS_IDR, &conn->flags); _leave(" [CID %x]", conn->proto.cid); @@ -183,6 +173,7 @@ static struct rxrpc_connection * rxrpc_alloc_client_connection(struct rxrpc_conn_parameters *cp, gfp_t gfp) { struct rxrpc_connection *conn; + struct rxrpc_net *rxnet = cp->local->rxnet; int ret; _enter(""); @@ -196,10 +187,13 @@ rxrpc_alloc_client_connection(struct rxrpc_conn_parameters *cp, gfp_t gfp) atomic_set(&conn->usage, 1); if (cp->exclusive) __set_bit(RXRPC_CONN_DONT_REUSE, &conn->flags); + if (cp->upgrade) + __set_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags); conn->params = *cp; conn->out_clientflag = RXRPC_CLIENT_INITIATED; conn->state = RXRPC_CONN_CLIENT; + conn->service_id = cp->service_id; ret = rxrpc_get_client_connection_id(conn, gfp); if (ret < 0) @@ -213,9 +207,9 @@ rxrpc_alloc_client_connection(struct rxrpc_conn_parameters *cp, gfp_t gfp) if (ret < 0) goto error_2; - write_lock(&rxrpc_connection_lock); - list_add_tail(&conn->proc_link, &rxrpc_connection_proc_list); - write_unlock(&rxrpc_connection_lock); + write_lock(&rxnet->conn_lock); + list_add_tail(&conn->proc_link, &rxnet->conn_proc_list); + write_unlock(&rxnet->conn_lock); /* We steal the caller's peer ref. */ cp->peer = NULL; @@ -243,12 +237,13 @@ error_0: */ static bool rxrpc_may_reuse_conn(struct rxrpc_connection *conn) { + struct rxrpc_net *rxnet = conn->params.local->rxnet; int id_cursor, id, distance, limit; if (test_bit(RXRPC_CONN_DONT_REUSE, &conn->flags)) goto dont_reuse; - if (conn->proto.epoch != rxrpc_epoch) + if (conn->proto.epoch != rxnet->epoch) goto mark_dont_reuse; /* The IDR tree gets very expensive on memory if the connection IDs are @@ -297,6 +292,12 @@ static int rxrpc_get_client_conn(struct rxrpc_call *call, if (!cp->peer) goto error; + call->cong_cwnd = cp->peer->cong_cwnd; + if (call->cong_cwnd >= call->cong_ssthresh) + call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE; + else + call->cong_mode = RXRPC_CALL_SLOW_START; + /* If the connection is not meant to be exclusive, search the available * connections to see if the connection we want to use already exists. */ @@ -310,7 +311,8 @@ static int rxrpc_get_client_conn(struct rxrpc_call *call, #define cmp(X) ((long)conn->params.X - (long)cp->X) diff = (cmp(peer) ?: cmp(key) ?: - cmp(security_level)); + cmp(security_level) ?: + cmp(upgrade)); #undef cmp if (diff < 0) { p = p->rb_left; @@ -354,6 +356,7 @@ static int rxrpc_get_client_conn(struct rxrpc_call *call, if (cp->exclusive) { call->conn = candidate; call->security_ix = candidate->security_ix; + call->service_id = candidate->service_id; _leave(" = 0 [exclusive %d]", candidate->debug_id); return 0; } @@ -374,7 +377,8 @@ static int rxrpc_get_client_conn(struct rxrpc_call *call, #define cmp(X) ((long)conn->params.X - (long)candidate->params.X) diff = (cmp(peer) ?: cmp(key) ?: - cmp(security_level)); + cmp(security_level) ?: + cmp(upgrade)); #undef cmp if (diff < 0) { pp = &(*pp)->rb_left; @@ -403,6 +407,7 @@ candidate_published: set_bit(RXRPC_CONN_IN_CLIENT_CONNS, &candidate->flags); call->conn = candidate; call->security_ix = candidate->security_ix; + call->service_id = candidate->service_id; spin_unlock(&local->client_conns_lock); _leave(" = 0 [new %d]", candidate->debug_id); return 0; @@ -424,6 +429,7 @@ found_extant_conn: spin_lock(&conn->channel_lock); call->conn = conn; call->security_ix = conn->security_ix; + call->service_id = conn->service_id; list_add(&call->chan_wait_link, &conn->waiting_calls); spin_unlock(&conn->channel_lock); _leave(" = 0 [extant %d]", conn->debug_id); @@ -440,12 +446,18 @@ error: /* * Activate a connection. */ -static void rxrpc_activate_conn(struct rxrpc_connection *conn) +static void rxrpc_activate_conn(struct rxrpc_net *rxnet, + struct rxrpc_connection *conn) { - trace_rxrpc_client(conn, -1, rxrpc_client_to_active); - conn->cache_state = RXRPC_CONN_CLIENT_ACTIVE; - rxrpc_nr_active_client_conns++; - list_move_tail(&conn->cache_link, &rxrpc_active_client_conns); + if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags)) { + trace_rxrpc_client(conn, -1, rxrpc_client_to_upgrade); + conn->cache_state = RXRPC_CONN_CLIENT_UPGRADE; + } else { + trace_rxrpc_client(conn, -1, rxrpc_client_to_active); + conn->cache_state = RXRPC_CONN_CLIENT_ACTIVE; + } + rxnet->nr_active_client_conns++; + list_move_tail(&conn->cache_link, &rxnet->active_client_conns); } /* @@ -460,25 +472,28 @@ static void rxrpc_activate_conn(struct rxrpc_connection *conn) * channels if it has been culled to make space and then re-requested by a new * call. */ -static void rxrpc_animate_client_conn(struct rxrpc_connection *conn) +static void rxrpc_animate_client_conn(struct rxrpc_net *rxnet, + struct rxrpc_connection *conn) { unsigned int nr_conns; _enter("%d,%d", conn->debug_id, conn->cache_state); - if (conn->cache_state == RXRPC_CONN_CLIENT_ACTIVE) + if (conn->cache_state == RXRPC_CONN_CLIENT_ACTIVE || + conn->cache_state == RXRPC_CONN_CLIENT_UPGRADE) goto out; - spin_lock(&rxrpc_client_conn_cache_lock); + spin_lock(&rxnet->client_conn_cache_lock); - nr_conns = rxrpc_nr_client_conns; + nr_conns = rxnet->nr_client_conns; if (!test_and_set_bit(RXRPC_CONN_COUNTED, &conn->flags)) { trace_rxrpc_client(conn, -1, rxrpc_client_count); - rxrpc_nr_client_conns = nr_conns + 1; + rxnet->nr_client_conns = nr_conns + 1; } switch (conn->cache_state) { case RXRPC_CONN_CLIENT_ACTIVE: + case RXRPC_CONN_CLIENT_UPGRADE: case RXRPC_CONN_CLIENT_WAITING: break; @@ -494,21 +509,21 @@ static void rxrpc_animate_client_conn(struct rxrpc_connection *conn) } out_unlock: - spin_unlock(&rxrpc_client_conn_cache_lock); + spin_unlock(&rxnet->client_conn_cache_lock); out: _leave(" [%d]", conn->cache_state); return; activate_conn: _debug("activate"); - rxrpc_activate_conn(conn); + rxrpc_activate_conn(rxnet, conn); goto out_unlock; wait_for_capacity: _debug("wait"); trace_rxrpc_client(conn, -1, rxrpc_client_to_waiting); conn->cache_state = RXRPC_CONN_CLIENT_WAITING; - list_move_tail(&conn->cache_link, &rxrpc_waiting_client_conns); + list_move_tail(&conn->cache_link, &rxnet->waiting_client_conns); goto out_unlock; } @@ -582,6 +597,9 @@ static void rxrpc_activate_channels_locked(struct rxrpc_connection *conn) case RXRPC_CONN_CLIENT_ACTIVE: mask = RXRPC_ACTIVE_CHANS_MASK; break; + case RXRPC_CONN_CLIENT_UPGRADE: + mask = 0x01; + break; default: return; } @@ -660,18 +678,19 @@ int rxrpc_connect_call(struct rxrpc_call *call, struct sockaddr_rxrpc *srx, gfp_t gfp) { + struct rxrpc_net *rxnet = cp->local->rxnet; int ret; _enter("{%d,%lx},", call->debug_id, call->user_call_ID); - rxrpc_discard_expired_client_conns(NULL); - rxrpc_cull_active_client_conns(); + rxrpc_discard_expired_client_conns(&rxnet->client_conn_reaper.work); + rxrpc_cull_active_client_conns(rxnet); ret = rxrpc_get_client_conn(call, cp, srx, gfp); if (ret < 0) return ret; - rxrpc_animate_client_conn(call->conn); + rxrpc_animate_client_conn(rxnet, call->conn); rxrpc_activate_channels(call->conn); ret = rxrpc_wait_for_channel(call, gfp); @@ -729,6 +748,7 @@ void rxrpc_disconnect_client_call(struct rxrpc_call *call) unsigned int channel = call->cid & RXRPC_CHANNELMASK; struct rxrpc_connection *conn = call->conn; struct rxrpc_channel *chan = &conn->channels[channel]; + struct rxrpc_net *rxnet = rxrpc_net(sock_net(&call->socket->sk)); trace_rxrpc_client(conn, channel, rxrpc_client_chan_disconnect); call->conn = NULL; @@ -750,7 +770,7 @@ void rxrpc_disconnect_client_call(struct rxrpc_call *call) /* We must deactivate or idle the connection if it's now * waiting for nothing. */ - spin_lock(&rxrpc_client_conn_cache_lock); + spin_lock(&rxnet->client_conn_cache_lock); if (conn->cache_state == RXRPC_CONN_CLIENT_WAITING && list_empty(&conn->waiting_calls) && !conn->active_chans) @@ -787,14 +807,23 @@ void rxrpc_disconnect_client_call(struct rxrpc_call *call) * list. It might even get moved back to the active list whilst we're * waiting for the lock. */ - spin_lock(&rxrpc_client_conn_cache_lock); + spin_lock(&rxnet->client_conn_cache_lock); switch (conn->cache_state) { + case RXRPC_CONN_CLIENT_UPGRADE: + /* Deal with termination of a service upgrade probe. */ + if (test_bit(RXRPC_CONN_EXPOSED, &conn->flags)) { + clear_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags); + trace_rxrpc_client(conn, channel, rxrpc_client_to_active); + conn->cache_state = RXRPC_CONN_CLIENT_ACTIVE; + rxrpc_activate_channels_locked(conn); + } + /* fall through */ case RXRPC_CONN_CLIENT_ACTIVE: if (list_empty(&conn->waiting_calls)) { rxrpc_deactivate_one_channel(conn, channel); if (!conn->active_chans) { - rxrpc_nr_active_client_conns--; + rxnet->nr_active_client_conns--; goto idle_connection; } goto out; @@ -820,7 +849,7 @@ void rxrpc_disconnect_client_call(struct rxrpc_call *call) } out: - spin_unlock(&rxrpc_client_conn_cache_lock); + spin_unlock(&rxnet->client_conn_cache_lock); out_2: spin_unlock(&conn->channel_lock); rxrpc_put_connection(conn); @@ -835,11 +864,11 @@ idle_connection: trace_rxrpc_client(conn, channel, rxrpc_client_to_idle); conn->idle_timestamp = jiffies; conn->cache_state = RXRPC_CONN_CLIENT_IDLE; - list_move_tail(&conn->cache_link, &rxrpc_idle_client_conns); - if (rxrpc_idle_client_conns.next == &conn->cache_link && - !rxrpc_kill_all_client_conns) + list_move_tail(&conn->cache_link, &rxnet->idle_client_conns); + if (rxnet->idle_client_conns.next == &conn->cache_link && + !rxnet->kill_all_client_conns) queue_delayed_work(rxrpc_workqueue, - &rxrpc_client_conn_reap, + &rxnet->client_conn_reaper, rxrpc_conn_idle_client_expiry); } else { trace_rxrpc_client(conn, channel, rxrpc_client_to_inactive); @@ -857,6 +886,7 @@ rxrpc_put_one_client_conn(struct rxrpc_connection *conn) { struct rxrpc_connection *next = NULL; struct rxrpc_local *local = conn->params.local; + struct rxrpc_net *rxnet = local->rxnet; unsigned int nr_conns; trace_rxrpc_client(conn, -1, rxrpc_client_cleanup); @@ -875,18 +905,18 @@ rxrpc_put_one_client_conn(struct rxrpc_connection *conn) if (test_bit(RXRPC_CONN_COUNTED, &conn->flags)) { trace_rxrpc_client(conn, -1, rxrpc_client_uncount); - spin_lock(&rxrpc_client_conn_cache_lock); - nr_conns = --rxrpc_nr_client_conns; + spin_lock(&rxnet->client_conn_cache_lock); + nr_conns = --rxnet->nr_client_conns; if (nr_conns < rxrpc_max_client_connections && - !list_empty(&rxrpc_waiting_client_conns)) { - next = list_entry(rxrpc_waiting_client_conns.next, + !list_empty(&rxnet->waiting_client_conns)) { + next = list_entry(rxnet->waiting_client_conns.next, struct rxrpc_connection, cache_link); rxrpc_get_connection(next); - rxrpc_activate_conn(next); + rxrpc_activate_conn(rxnet, next); } - spin_unlock(&rxrpc_client_conn_cache_lock); + spin_unlock(&rxnet->client_conn_cache_lock); } rxrpc_kill_connection(conn); @@ -921,10 +951,10 @@ void rxrpc_put_client_conn(struct rxrpc_connection *conn) /* * Kill the longest-active client connections to make room for new ones. */ -static void rxrpc_cull_active_client_conns(void) +static void rxrpc_cull_active_client_conns(struct rxrpc_net *rxnet) { struct rxrpc_connection *conn; - unsigned int nr_conns = rxrpc_nr_client_conns; + unsigned int nr_conns = rxnet->nr_client_conns; unsigned int nr_active, limit; _enter(""); @@ -936,14 +966,15 @@ static void rxrpc_cull_active_client_conns(void) } limit = rxrpc_reap_client_connections; - spin_lock(&rxrpc_client_conn_cache_lock); - nr_active = rxrpc_nr_active_client_conns; + spin_lock(&rxnet->client_conn_cache_lock); + nr_active = rxnet->nr_active_client_conns; while (nr_active > limit) { - ASSERT(!list_empty(&rxrpc_active_client_conns)); - conn = list_entry(rxrpc_active_client_conns.next, + ASSERT(!list_empty(&rxnet->active_client_conns)); + conn = list_entry(rxnet->active_client_conns.next, struct rxrpc_connection, cache_link); - ASSERTCMP(conn->cache_state, ==, RXRPC_CONN_CLIENT_ACTIVE); + ASSERTIFCMP(conn->cache_state != RXRPC_CONN_CLIENT_ACTIVE, + conn->cache_state, ==, RXRPC_CONN_CLIENT_UPGRADE); if (list_empty(&conn->waiting_calls)) { trace_rxrpc_client(conn, -1, rxrpc_client_to_culled); @@ -953,14 +984,14 @@ static void rxrpc_cull_active_client_conns(void) trace_rxrpc_client(conn, -1, rxrpc_client_to_waiting); conn->cache_state = RXRPC_CONN_CLIENT_WAITING; list_move_tail(&conn->cache_link, - &rxrpc_waiting_client_conns); + &rxnet->waiting_client_conns); } nr_active--; } - rxrpc_nr_active_client_conns = nr_active; - spin_unlock(&rxrpc_client_conn_cache_lock); + rxnet->nr_active_client_conns = nr_active; + spin_unlock(&rxnet->client_conn_cache_lock); ASSERTCMP(nr_active, >=, 0); _leave(" [culled]"); } @@ -972,22 +1003,25 @@ static void rxrpc_cull_active_client_conns(void) * This may be called from conn setup or from a work item so cannot be * considered non-reentrant. */ -static void rxrpc_discard_expired_client_conns(struct work_struct *work) +void rxrpc_discard_expired_client_conns(struct work_struct *work) { struct rxrpc_connection *conn; + struct rxrpc_net *rxnet = + container_of(to_delayed_work(work), + struct rxrpc_net, client_conn_reaper); unsigned long expiry, conn_expires_at, now; unsigned int nr_conns; bool did_discard = false; - _enter("%c", work ? 'w' : 'n'); + _enter(""); - if (list_empty(&rxrpc_idle_client_conns)) { + if (list_empty(&rxnet->idle_client_conns)) { _leave(" [empty]"); return; } /* Don't double up on the discarding */ - if (!spin_trylock(&rxrpc_client_conn_discard_mutex)) { + if (!spin_trylock(&rxnet->client_conn_discard_lock)) { _leave(" [already]"); return; } @@ -995,19 +1029,19 @@ static void rxrpc_discard_expired_client_conns(struct work_struct *work) /* We keep an estimate of what the number of conns ought to be after * we've discarded some so that we don't overdo the discarding. */ - nr_conns = rxrpc_nr_client_conns; + nr_conns = rxnet->nr_client_conns; next: - spin_lock(&rxrpc_client_conn_cache_lock); + spin_lock(&rxnet->client_conn_cache_lock); - if (list_empty(&rxrpc_idle_client_conns)) + if (list_empty(&rxnet->idle_client_conns)) goto out; - conn = list_entry(rxrpc_idle_client_conns.next, + conn = list_entry(rxnet->idle_client_conns.next, struct rxrpc_connection, cache_link); ASSERT(test_bit(RXRPC_CONN_EXPOSED, &conn->flags)); - if (!rxrpc_kill_all_client_conns) { + if (!rxnet->kill_all_client_conns) { /* If the number of connections is over the reap limit, we * expedite discard by reducing the expiry timeout. We must, * however, have at least a short grace period to be able to do @@ -1030,7 +1064,7 @@ next: conn->cache_state = RXRPC_CONN_CLIENT_INACTIVE; list_del_init(&conn->cache_link); - spin_unlock(&rxrpc_client_conn_cache_lock); + spin_unlock(&rxnet->client_conn_cache_lock); /* When we cleared the EXPOSED flag, we took on responsibility for the * reference that that had on the usage count. We deal with that here. @@ -1050,14 +1084,14 @@ not_yet_expired: * then things get messier. */ _debug("not yet"); - if (!rxrpc_kill_all_client_conns) + if (!rxnet->kill_all_client_conns) queue_delayed_work(rxrpc_workqueue, - &rxrpc_client_conn_reap, + &rxnet->client_conn_reaper, conn_expires_at - now); out: - spin_unlock(&rxrpc_client_conn_cache_lock); - spin_unlock(&rxrpc_client_conn_discard_mutex); + spin_unlock(&rxnet->client_conn_cache_lock); + spin_unlock(&rxnet->client_conn_discard_lock); _leave(""); } @@ -1065,17 +1099,17 @@ out: * Preemptively destroy all the client connection records rather than waiting * for them to time out */ -void __exit rxrpc_destroy_all_client_connections(void) +void rxrpc_destroy_all_client_connections(struct rxrpc_net *rxnet) { _enter(""); - spin_lock(&rxrpc_client_conn_cache_lock); - rxrpc_kill_all_client_conns = true; - spin_unlock(&rxrpc_client_conn_cache_lock); + spin_lock(&rxnet->client_conn_cache_lock); + rxnet->kill_all_client_conns = true; + spin_unlock(&rxnet->client_conn_cache_lock); - cancel_delayed_work(&rxrpc_client_conn_reap); + cancel_delayed_work(&rxnet->client_conn_reaper); - if (!queue_delayed_work(rxrpc_workqueue, &rxrpc_client_conn_reap, 0)) + if (!queue_delayed_work(rxrpc_workqueue, &rxnet->client_conn_reaper, 0)) _debug("destroy: queue failed"); _leave(""); |