connection.c revision f64f9e719261a87818dd192a3a2352e5b20fbd0f
100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover/* 200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * Copyright (c) 2006 Oracle. All rights reserved. 300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * 400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * This software is available to you under a choice of one of two 500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * licenses. You may choose to be licensed under the terms of the GNU 600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * General Public License (GPL) Version 2, available from the file 700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * COPYING in the main directory of this source tree, or the 800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * OpenIB.org BSD license below: 900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * 1000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * Redistribution and use in source and binary forms, with or 1100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * without modification, are permitted provided that the following 1200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * conditions are met: 1300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * 1400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * - Redistributions of source code must retain the above 1500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * copyright notice, this list of conditions and the following 1600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * disclaimer. 1700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * 1800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * - Redistributions in binary form must reproduce the above 1900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * copyright notice, this list of conditions and the following 2000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * disclaimer in the documentation and/or other materials 2100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * provided with the distribution. 2200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * 2300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 2400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 2500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 2600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 2700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 2800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 2900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 3000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * SOFTWARE. 3100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * 3200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover */ 3300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover#include <linux/kernel.h> 3400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover#include <linux/list.h> 3500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover#include <net/inet_hashtables.h> 3600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 3700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover#include "rds.h" 3800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover#include "loop.h" 3900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover#include "rdma.h" 4000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 4100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover#define RDS_CONNECTION_HASH_BITS 12 4200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover#define RDS_CONNECTION_HASH_ENTRIES (1 << RDS_CONNECTION_HASH_BITS) 4300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover#define RDS_CONNECTION_HASH_MASK (RDS_CONNECTION_HASH_ENTRIES - 1) 4400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 4500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover/* converting this to RCU is a chore for another day.. */ 4600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstatic DEFINE_SPINLOCK(rds_conn_lock); 4700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstatic unsigned long rds_conn_count; 4800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstatic struct hlist_head rds_conn_hash[RDS_CONNECTION_HASH_ENTRIES]; 4900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstatic struct kmem_cache *rds_conn_slab; 5000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 5100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstatic struct hlist_head *rds_conn_bucket(__be32 laddr, __be32 faddr) 5200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 5300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover /* Pass NULL, don't need struct net for hash */ 5400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover unsigned long hash = inet_ehashfn(NULL, 5500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover be32_to_cpu(laddr), 0, 5600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover be32_to_cpu(faddr), 0); 5700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover return &rds_conn_hash[hash & RDS_CONNECTION_HASH_MASK]; 5800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 5900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 6000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover#define rds_conn_info_set(var, test, suffix) do { \ 6100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (test) \ 6200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover var |= RDS_INFO_CONNECTION_FLAG_##suffix; \ 6300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} while (0) 6400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 6500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstatic inline int rds_conn_is_sending(struct rds_connection *conn) 6600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 6700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover int ret = 0; 6800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 6900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (!mutex_trylock(&conn->c_send_lock)) 7000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover ret = 1; 7100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover else 7200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover mutex_unlock(&conn->c_send_lock); 7300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 7400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover return ret; 7500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 7600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 7700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstatic struct rds_connection *rds_conn_lookup(struct hlist_head *head, 7800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover __be32 laddr, __be32 faddr, 7900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_transport *trans) 8000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 8100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_connection *conn, *ret = NULL; 8200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct hlist_node *pos; 8300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 8400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover hlist_for_each_entry(conn, pos, head, c_hash_node) { 8500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (conn->c_faddr == faddr && conn->c_laddr == laddr && 8600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn->c_trans == trans) { 8700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover ret = conn; 8800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover break; 8900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 9000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 9100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rdsdebug("returning conn %p for %pI4 -> %pI4\n", ret, 9200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover &laddr, &faddr); 9300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover return ret; 9400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 9500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 9600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover/* 9700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * This is called by transports as they're bringing down a connection. 9800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * It clears partial message state so that the transport can start sending 9900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * and receiving over this connection again in the future. It is up to 10000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * the transport to have serialized this call with its send and recv. 10100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover */ 10200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grovervoid rds_conn_reset(struct rds_connection *conn) 10300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 10400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rdsdebug("connection %pI4 to %pI4 reset\n", 10500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover &conn->c_laddr, &conn->c_faddr); 10600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 10700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_stats_inc(s_conn_reset); 10800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_send_reset(conn); 10900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn->c_flags = 0; 11000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 11100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover /* Do not clear next_rx_seq here, else we cannot distinguish 11200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * retransmitted packets from new packets, and will hand all 11300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * of them to the application. That is not consistent with the 11400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * reliability guarantees of RDS. */ 11500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 11600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 11700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover/* 11800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * There is only every one 'conn' for a given pair of addresses in the 11900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * system at a time. They contain messages to be retransmitted and so 12000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * span the lifetime of the actual underlying transport connections. 12100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * 12200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * For now they are not garbage collected once they're created. They 12300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * are torn down as the module is removed, if ever. 12400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover */ 12500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstatic struct rds_connection *__rds_conn_create(__be32 laddr, __be32 faddr, 12600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_transport *trans, gfp_t gfp, 12700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover int is_outgoing) 12800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 129cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover struct rds_connection *conn, *parent = NULL; 13000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct hlist_head *head = rds_conn_bucket(laddr, faddr); 13100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover unsigned long flags; 13200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover int ret; 13300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 13400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover spin_lock_irqsave(&rds_conn_lock, flags); 13500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn = rds_conn_lookup(head, laddr, faddr, trans); 136f64f9e719261a87818dd192a3a2352e5b20fbd0fJoe Perches if (conn && conn->c_loopback && conn->c_trans != &rds_loop_transport && 137f64f9e719261a87818dd192a3a2352e5b20fbd0fJoe Perches !is_outgoing) { 13800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover /* This is a looped back IB connection, and we're 13900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * called by the code handling the incoming connect. 14000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * We need a second connection object into which we 14100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * can stick the other QP. */ 14200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover parent = conn; 14300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn = parent->c_passive; 14400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 14500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover spin_unlock_irqrestore(&rds_conn_lock, flags); 14600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (conn) 14700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover goto out; 14800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 14905a178ecdc7396b78dfbb5d8bda65108b37b8672Wei Yongjun conn = kmem_cache_zalloc(rds_conn_slab, gfp); 15000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (conn == NULL) { 15100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn = ERR_PTR(-ENOMEM); 15200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover goto out; 15300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 15400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 15500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover INIT_HLIST_NODE(&conn->c_hash_node); 15600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn->c_laddr = laddr; 15700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn->c_faddr = faddr; 15800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover spin_lock_init(&conn->c_lock); 15900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn->c_next_tx_seq = 1; 16000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 16100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover mutex_init(&conn->c_send_lock); 16200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover INIT_LIST_HEAD(&conn->c_send_queue); 16300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover INIT_LIST_HEAD(&conn->c_retrans); 16400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 16500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover ret = rds_cong_get_maps(conn); 16600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (ret) { 16700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover kmem_cache_free(rds_conn_slab, conn); 16800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn = ERR_PTR(ret); 16900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover goto out; 17000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 17100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 17200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover /* 17300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * This is where a connection becomes loopback. If *any* RDS sockets 17400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * can bind to the destination address then we'd rather the messages 17500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * flow through loopback rather than either transport. 17600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover */ 17700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (rds_trans_get_preferred(faddr)) { 17800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn->c_loopback = 1; 17900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (is_outgoing && trans->t_prefer_loopback) { 18000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover /* "outgoing" connection - and the transport 18100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * says it wants the connection handled by the 18200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * loopback transport. This is what TCP does. 18300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover */ 18400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover trans = &rds_loop_transport; 18500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 18600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 18700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 18800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn->c_trans = trans; 18900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 19000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover ret = trans->conn_alloc(conn, gfp); 19100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (ret) { 19200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover kmem_cache_free(rds_conn_slab, conn); 19300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn = ERR_PTR(ret); 19400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover goto out; 19500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 19600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 19700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover atomic_set(&conn->c_state, RDS_CONN_DOWN); 19800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn->c_reconnect_jiffies = 0; 19900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover INIT_DELAYED_WORK(&conn->c_send_w, rds_send_worker); 20000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover INIT_DELAYED_WORK(&conn->c_recv_w, rds_recv_worker); 20100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover INIT_DELAYED_WORK(&conn->c_conn_w, rds_connect_worker); 20200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover INIT_WORK(&conn->c_down_w, rds_shutdown_worker); 20300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover mutex_init(&conn->c_cm_lock); 20400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn->c_flags = 0; 20500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 20600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rdsdebug("allocated conn %p for %pI4 -> %pI4 over %s %s\n", 20700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn, &laddr, &faddr, 20800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover trans->t_name ? trans->t_name : "[unknown]", 20900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover is_outgoing ? "(outgoing)" : ""); 21000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 211cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover /* 212cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover * Since we ran without holding the conn lock, someone could 213cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover * have created the same conn (either normal or passive) in the 214cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover * interim. We check while holding the lock. If we won, we complete 215cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover * init and return our conn. If we lost, we rollback and return the 216cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover * other one. 217cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover */ 21800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover spin_lock_irqsave(&rds_conn_lock, flags); 219cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover if (parent) { 220cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover /* Creating passive conn */ 221cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover if (parent->c_passive) { 222cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover trans->conn_free(conn->c_transport_data); 223cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover kmem_cache_free(rds_conn_slab, conn); 224cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover conn = parent->c_passive; 225cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover } else { 22600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover parent->c_passive = conn; 227cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover rds_cong_add_conn(conn); 228cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover rds_conn_count++; 229cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover } 23000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } else { 231cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover /* Creating normal conn */ 232cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover struct rds_connection *found; 233cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover 234cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover found = rds_conn_lookup(head, laddr, faddr, trans); 235cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover if (found) { 236cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover trans->conn_free(conn->c_transport_data); 237cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover kmem_cache_free(rds_conn_slab, conn); 238cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover conn = found; 239cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover } else { 240cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover hlist_add_head(&conn->c_hash_node, head); 241cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover rds_cong_add_conn(conn); 242cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover rds_conn_count++; 243cb24405e67e56cbef51b5e4d0bb0a0fde167261fAndy Grover } 24400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 24500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover spin_unlock_irqrestore(&rds_conn_lock, flags); 24600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 24700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverout: 24800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover return conn; 24900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 25000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 25100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstruct rds_connection *rds_conn_create(__be32 laddr, __be32 faddr, 25200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_transport *trans, gfp_t gfp) 25300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 25400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover return __rds_conn_create(laddr, faddr, trans, gfp, 0); 25500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 256616b757ae18fb8ec2dfe7ff9d3f589f82cb0eb9dAndy GroverEXPORT_SYMBOL_GPL(rds_conn_create); 25700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 25800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstruct rds_connection *rds_conn_create_outgoing(__be32 laddr, __be32 faddr, 25900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_transport *trans, gfp_t gfp) 26000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 26100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover return __rds_conn_create(laddr, faddr, trans, gfp, 1); 26200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 263616b757ae18fb8ec2dfe7ff9d3f589f82cb0eb9dAndy GroverEXPORT_SYMBOL_GPL(rds_conn_create_outgoing); 26400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 26500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grovervoid rds_conn_destroy(struct rds_connection *conn) 26600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 26700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_message *rm, *rtmp; 26800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 26900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rdsdebug("freeing conn %p for %pI4 -> " 27000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover "%pI4\n", conn, &conn->c_laddr, 27100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover &conn->c_faddr); 27200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 27300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover hlist_del_init(&conn->c_hash_node); 27400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 27500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover /* wait for the rds thread to shut it down */ 27600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover atomic_set(&conn->c_state, RDS_CONN_ERROR); 27700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover cancel_delayed_work(&conn->c_conn_w); 27800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover queue_work(rds_wq, &conn->c_down_w); 27900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover flush_workqueue(rds_wq); 28000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 28100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover /* tear down queued messages */ 28200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover list_for_each_entry_safe(rm, rtmp, 28300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover &conn->c_send_queue, 28400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover m_conn_item) { 28500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover list_del_init(&rm->m_conn_item); 28600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover BUG_ON(!list_empty(&rm->m_sock_item)); 28700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_message_put(rm); 28800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 28900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (conn->c_xmit_rm) 29000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_message_put(conn->c_xmit_rm); 29100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 29200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn->c_trans->conn_free(conn->c_transport_data); 29300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 29400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover /* 29500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * The congestion maps aren't freed up here. They're 29600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * freed by rds_cong_exit() after all the connections 29700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * have been freed. 29800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover */ 29900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_cong_remove_conn(conn); 30000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 30100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover BUG_ON(!list_empty(&conn->c_retrans)); 30200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover kmem_cache_free(rds_conn_slab, conn); 30300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 30400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_conn_count--; 30500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 306616b757ae18fb8ec2dfe7ff9d3f589f82cb0eb9dAndy GroverEXPORT_SYMBOL_GPL(rds_conn_destroy); 30700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 30800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstatic void rds_conn_message_info(struct socket *sock, unsigned int len, 30900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_info_iterator *iter, 31000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_info_lengths *lens, 31100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover int want_send) 31200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 31300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct hlist_head *head; 31400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct hlist_node *pos; 31500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct list_head *list; 31600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_connection *conn; 31700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_message *rm; 31800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover unsigned long flags; 31900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover unsigned int total = 0; 32000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover size_t i; 32100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 32200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover len /= sizeof(struct rds_info_message); 32300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 32400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover spin_lock_irqsave(&rds_conn_lock, flags); 32500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 32600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover for (i = 0, head = rds_conn_hash; i < ARRAY_SIZE(rds_conn_hash); 32700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover i++, head++) { 32800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover hlist_for_each_entry(conn, pos, head, c_hash_node) { 32900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (want_send) 33000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover list = &conn->c_send_queue; 33100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover else 33200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover list = &conn->c_retrans; 33300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 33400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover spin_lock(&conn->c_lock); 33500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 33600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover /* XXX too lazy to maintain counts.. */ 33700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover list_for_each_entry(rm, list, m_conn_item) { 33800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover total++; 33900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (total <= len) 34000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_inc_info_copy(&rm->m_inc, iter, 34100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn->c_laddr, 34200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover conn->c_faddr, 0); 34300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 34400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 34500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover spin_unlock(&conn->c_lock); 34600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 34700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 34800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 34900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover spin_unlock_irqrestore(&rds_conn_lock, flags); 35000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 35100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover lens->nr = total; 35200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover lens->each = sizeof(struct rds_info_message); 35300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 35400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 35500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstatic void rds_conn_message_info_send(struct socket *sock, unsigned int len, 35600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_info_iterator *iter, 35700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_info_lengths *lens) 35800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 35900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_conn_message_info(sock, len, iter, lens, 1); 36000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 36100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 36200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstatic void rds_conn_message_info_retrans(struct socket *sock, 36300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover unsigned int len, 36400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_info_iterator *iter, 36500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_info_lengths *lens) 36600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 36700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_conn_message_info(sock, len, iter, lens, 0); 36800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 36900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 37000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grovervoid rds_for_each_conn_info(struct socket *sock, unsigned int len, 37100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_info_iterator *iter, 37200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_info_lengths *lens, 37300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover int (*visitor)(struct rds_connection *, void *), 37400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover size_t item_len) 37500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 37600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover uint64_t buffer[(item_len + 7) / 8]; 37700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct hlist_head *head; 37800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct hlist_node *pos; 37900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct hlist_node *tmp; 38000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_connection *conn; 38100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover unsigned long flags; 38200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover size_t i; 38300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 38400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover spin_lock_irqsave(&rds_conn_lock, flags); 38500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 38600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover lens->nr = 0; 38700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover lens->each = item_len; 38800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 38900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover for (i = 0, head = rds_conn_hash; i < ARRAY_SIZE(rds_conn_hash); 39000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover i++, head++) { 39100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover hlist_for_each_entry_safe(conn, pos, tmp, head, c_hash_node) { 39200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 39300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover /* XXX no c_lock usage.. */ 39400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (!visitor(conn, buffer)) 39500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover continue; 39600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 39700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover /* We copy as much as we can fit in the buffer, 39800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * but we count all items so that the caller 39900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * can resize the buffer. */ 40000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (len >= item_len) { 40100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_info_copy(iter, buffer, item_len); 40200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover len -= item_len; 40300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 40400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover lens->nr++; 40500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 40600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover } 40700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 40800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover spin_unlock_irqrestore(&rds_conn_lock, flags); 40900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 410616b757ae18fb8ec2dfe7ff9d3f589f82cb0eb9dAndy GroverEXPORT_SYMBOL_GPL(rds_for_each_conn_info); 41100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 41200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstatic int rds_conn_info_visitor(struct rds_connection *conn, 41300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover void *buffer) 41400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 41500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_info_connection *cinfo = buffer; 41600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 41700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover cinfo->next_tx_seq = conn->c_next_tx_seq; 41800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover cinfo->next_rx_seq = conn->c_next_rx_seq; 41900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover cinfo->laddr = conn->c_laddr; 42000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover cinfo->faddr = conn->c_faddr; 42100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover strncpy(cinfo->transport, conn->c_trans->t_name, 42200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover sizeof(cinfo->transport)); 42300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover cinfo->flags = 0; 42400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 42500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_conn_info_set(cinfo->flags, 42600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_conn_is_sending(conn), SENDING); 42700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover /* XXX Future: return the state rather than these funky bits */ 42800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_conn_info_set(cinfo->flags, 42900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover atomic_read(&conn->c_state) == RDS_CONN_CONNECTING, 43000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover CONNECTING); 43100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_conn_info_set(cinfo->flags, 43200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover atomic_read(&conn->c_state) == RDS_CONN_UP, 43300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover CONNECTED); 43400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover return 1; 43500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 43600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 43700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverstatic void rds_conn_info(struct socket *sock, unsigned int len, 43800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_info_iterator *iter, 43900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover struct rds_info_lengths *lens) 44000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 44100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_for_each_conn_info(sock, len, iter, lens, 44200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_conn_info_visitor, 44300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover sizeof(struct rds_info_connection)); 44400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 44500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 44600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Groverint __init rds_conn_init(void) 44700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 44800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_conn_slab = kmem_cache_create("rds_connection", 44900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover sizeof(struct rds_connection), 45000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 0, 0, NULL); 45100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover if (rds_conn_slab == NULL) 45200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover return -ENOMEM; 45300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 45400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_info_register_func(RDS_INFO_CONNECTIONS, rds_conn_info); 45500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_info_register_func(RDS_INFO_SEND_MESSAGES, 45600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_conn_message_info_send); 45700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_info_register_func(RDS_INFO_RETRANS_MESSAGES, 45800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_conn_message_info_retrans); 45900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 46000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover return 0; 46100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 46200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 46300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grovervoid rds_conn_exit(void) 46400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 46500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_loop_exit(); 46600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 46700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover WARN_ON(!hlist_empty(rds_conn_hash)); 46800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 46900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover kmem_cache_destroy(rds_conn_slab); 47000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 47100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_info_deregister_func(RDS_INFO_CONNECTIONS, rds_conn_info); 47200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_info_deregister_func(RDS_INFO_SEND_MESSAGES, 47300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_conn_message_info_send); 47400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_info_deregister_func(RDS_INFO_RETRANS_MESSAGES, 47500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_conn_message_info_retrans); 47600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 47700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 47800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover/* 47900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * Force a disconnect 48000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover */ 48100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grovervoid rds_conn_drop(struct rds_connection *conn) 48200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 48300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover atomic_set(&conn->c_state, RDS_CONN_ERROR); 48400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover queue_work(rds_wq, &conn->c_down_w); 48500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 486616b757ae18fb8ec2dfe7ff9d3f589f82cb0eb9dAndy GroverEXPORT_SYMBOL_GPL(rds_conn_drop); 48700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 48800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover/* 48900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover * An error occurred on the connection 49000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover */ 49100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grovervoid 49200e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover__rds_conn_error(struct rds_connection *conn, const char *fmt, ...) 49300e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover{ 49400e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover va_list ap; 49500e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 49600e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover va_start(ap, fmt); 49700e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover vprintk(fmt, ap); 49800e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover va_end(ap); 49900e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover 50000e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover rds_conn_drop(conn); 50100e0f34c616603ba6500f41943cbf89eb4a8a5beAndy Grover} 502