diff options
Diffstat (limited to 'net/rds/cong.c')
| -rw-r--r-- | net/rds/cong.c | 50 |
1 files changed, 36 insertions, 14 deletions
diff --git a/net/rds/cong.c b/net/rds/cong.c index e5b65acd650b..8b689ebbd5b5 100644 --- a/net/rds/cong.c +++ b/net/rds/cong.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2007 Oracle. All rights reserved. + * Copyright (c) 2007, 2017 Oracle and/or its affiliates. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU @@ -101,7 +101,7 @@ static DEFINE_RWLOCK(rds_cong_monitor_lock); static DEFINE_SPINLOCK(rds_cong_lock); static struct rb_root rds_cong_tree = RB_ROOT; -static struct rds_cong_map *rds_cong_tree_walk(__be32 addr, +static struct rds_cong_map *rds_cong_tree_walk(const struct in6_addr *addr, struct rds_cong_map *insert) { struct rb_node **p = &rds_cong_tree.rb_node; @@ -109,12 +109,15 @@ static struct rds_cong_map *rds_cong_tree_walk(__be32 addr, struct rds_cong_map *map; while (*p) { + int diff; + parent = *p; map = rb_entry(parent, struct rds_cong_map, m_rb_node); - if (addr < map->m_addr) + diff = rds_addr_cmp(addr, &map->m_addr); + if (diff < 0) p = &(*p)->rb_left; - else if (addr > map->m_addr) + else if (diff > 0) p = &(*p)->rb_right; else return map; @@ -132,7 +135,7 @@ static struct rds_cong_map *rds_cong_tree_walk(__be32 addr, * these bitmaps in the process getting pointers to them. The bitmaps are only * ever freed as the module is removed after all connections have been freed. */ -static struct rds_cong_map *rds_cong_from_addr(__be32 addr) +static struct rds_cong_map *rds_cong_from_addr(const struct in6_addr *addr) { struct rds_cong_map *map; struct rds_cong_map *ret = NULL; @@ -144,7 +147,7 @@ static struct rds_cong_map *rds_cong_from_addr(__be32 addr) if (!map) return NULL; - map->m_addr = addr; + map->m_addr = *addr; init_waitqueue_head(&map->m_waitq); INIT_LIST_HEAD(&map->m_conn_list); @@ -171,7 +174,7 @@ out: kfree(map); } - rdsdebug("map %p for addr %x\n", ret, be32_to_cpu(addr)); + rdsdebug("map %p for addr %pI6c\n", ret, addr); return ret; } @@ -202,8 +205,8 @@ void rds_cong_remove_conn(struct rds_connection *conn) int rds_cong_get_maps(struct rds_connection *conn) { - conn->c_lcong = rds_cong_from_addr(conn->c_laddr); - conn->c_fcong = rds_cong_from_addr(conn->c_faddr); + conn->c_lcong = rds_cong_from_addr(&conn->c_laddr); + conn->c_fcong = rds_cong_from_addr(&conn->c_faddr); if (!(conn->c_lcong && conn->c_fcong)) return -ENOMEM; @@ -219,10 +222,29 @@ void rds_cong_queue_updates(struct rds_cong_map *map) spin_lock_irqsave(&rds_cong_lock, flags); list_for_each_entry(conn, &map->m_conn_list, c_map_item) { - if (!test_and_set_bit(0, &conn->c_map_queued)) { + struct rds_conn_path *cp = &conn->c_path[0]; + + rcu_read_lock(); + if (!test_and_set_bit(0, &conn->c_map_queued) && + !rds_destroy_pending(cp->cp_conn)) { rds_stats_inc(s_cong_update_queued); - rds_send_xmit(conn); + /* We cannot inline the call to rds_send_xmit() here + * for two reasons (both pertaining to a TCP transport): + * 1. When we get here from the receive path, we + * are already holding the sock_lock (held by + * tcp_v4_rcv()). So inlining calls to + * tcp_setsockopt and/or tcp_sendmsg will deadlock + * when it tries to get the sock_lock()) + * 2. Interrupts are masked so that we can mark the + * port congested from both send and recv paths. + * (See comment around declaration of rdc_cong_lock). + * An attempt to get the sock_lock() here will + * therefore trigger warnings. + * Defer the xmit to rds_send_worker() instead. + */ + queue_delayed_work(rds_wq, &cp->cp_send_w, 0); } + rcu_read_unlock(); } spin_unlock_irqrestore(&rds_cong_lock, flags); @@ -285,7 +307,7 @@ void rds_cong_set_bit(struct rds_cong_map *map, __be16 port) i = be16_to_cpu(port) / RDS_CONG_MAP_PAGE_BITS; off = be16_to_cpu(port) % RDS_CONG_MAP_PAGE_BITS; - __set_bit_le(off, (void *)map->m_page_addrs[i]); + set_bit_le(off, (void *)map->m_page_addrs[i]); } void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port) @@ -299,7 +321,7 @@ void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port) i = be16_to_cpu(port) / RDS_CONG_MAP_PAGE_BITS; off = be16_to_cpu(port) % RDS_CONG_MAP_PAGE_BITS; - __clear_bit_le(off, (void *)map->m_page_addrs[i]); + clear_bit_le(off, (void *)map->m_page_addrs[i]); } static int rds_cong_test_bit(struct rds_cong_map *map, __be16 port) @@ -334,7 +356,7 @@ void rds_cong_remove_socket(struct rds_sock *rs) /* update congestion map for now-closed port */ spin_lock_irqsave(&rds_cong_lock, flags); - map = rds_cong_tree_walk(rs->rs_bound_addr, NULL); + map = rds_cong_tree_walk(&rs->rs_bound_addr, NULL); spin_unlock_irqrestore(&rds_cong_lock, flags); if (map && rds_cong_test_bit(map, rs->rs_bound_port)) { |