/* * Copyright (c) 2006 Oracle. 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 * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * */ #include <linux/kernel.h> #include <linux/slab.h> #include <linux/in.h> #include "rds.h" #include "loop.h" static DEFINE_SPINLOCK(loop_conns_lock); static LIST_HEAD(loop_conns); /* * This 'loopback' transport is a special case for flows that originate * and terminate on the same machine. * * Connection build-up notices if the destination address is thought of * as a local address by a transport. At that time it decides to use the * loopback transport instead of the bound transport of the sending socket. * * The loopback transport's sending path just hands the sent rds_message * straight to the receiving path via an embedded rds_incoming. */ /* * Usually a message transits both the sender and receiver's conns as it * flows to the receiver. In the loopback case, though, the receive path * is handed the sending conn so the sense of the addresses is reversed. */ static int rds_loop_xmit(struct rds_connection *conn, struct rds_message *rm, unsigned int hdr_off, unsigned int sg, unsigned int off) { BUG_ON(hdr_off || sg || off); rds_inc_init(&rm->m_inc, conn, conn->c_laddr); rds_message_addref(rm); /* for the inc */ rds_recv_incoming(conn, conn->c_laddr, conn->c_faddr, &rm->m_inc, GFP_KERNEL, KM_USER0); rds_send_drop_acked(conn, be64_to_cpu(rm->m_inc.i_hdr.h_sequence), NULL); rds_inc_put(&rm->m_inc); return sizeof(struct rds_header) + be32_to_cpu(rm->m_inc.i_hdr.h_len); } static int rds_loop_xmit_cong_map(struct rds_connection *conn, struct rds_cong_map *map, unsigned long offset) { unsigned long i; BUG_ON(offset); BUG_ON(map != conn->c_lcong); for (i = 0; i < RDS_CONG_MAP_PAGES; i++) { memcpy((void *)conn->c_fcong->m_page_addrs[i], (void *)map->m_page_addrs[i], PAGE_SIZE); } rds_cong_map_updated(conn->c_fcong, ~(u64) 0); return sizeof(struct rds_header) + RDS_CONG_MAP_BYTES; } /* we need to at least give the thread something to succeed */ static int rds_loop_recv(struct rds_connection *conn) { return 0; } struct rds_loop_connection { struct list_head loop_node; struct rds_connection *conn; }; /* * Even the loopback transport needs to keep track of its connections, * so it can call rds_conn_destroy() on them on exit. N.B. there are * 1+ loopback addresses (127.*.*.*) so it's not a bug to have * multiple loopback conns allocated, although rather useless. */ static int rds_loop_conn_alloc(struct rds_connection *conn, gfp_t gfp) { struct rds_loop_connection *lc; unsigned long flags; lc = kzalloc(sizeof(struct rds_loop_connection), GFP_KERNEL); if (lc == NULL) return -ENOMEM; INIT_LIST_HEAD(&lc->loop_node); lc->conn = conn; conn->c_transport_data = lc; spin_lock_irqsave(&loop_conns_lock, flags); list_add_tail(&lc->loop_node, &loop_conns); spin_unlock_irqrestore(&loop_conns_lock, flags); return 0; } static void rds_loop_conn_free(void *arg) { struct rds_loop_connection *lc = arg; rdsdebug("lc %p\n", lc); list_del(&lc->loop_node); kfree(lc); } static int rds_loop_conn_connect(struct rds_connection *conn) { rds_connect_complete(conn); return 0; } static void rds_loop_conn_shutdown(struct rds_connection *conn) { } void rds_loop_exit(void) { struct rds_loop_connection *lc, *_lc; LIST_HEAD(tmp_list); /* avoid calling conn_destroy with irqs off */ spin_lock_irq(&loop_conns_lock); list_splice(&loop_conns, &tmp_list); INIT_LIST_HEAD(&loop_conns); spin_unlock_irq(&loop_conns_lock); list_for_each_entry_safe(lc, _lc, &tmp_list, loop_node) { WARN_ON(lc->conn->c_passive); rds_conn_destroy(lc->conn); } } /* * This is missing .xmit_* because loop doesn't go through generic * rds_send_xmit() and doesn't call rds_recv_incoming(). .listen_stop and * .laddr_check are missing because transport.c doesn't iterate over * rds_loop_transport. */ struct rds_transport rds_loop_transport = { .xmit = rds_loop_xmit, .xmit_cong_map = rds_loop_xmit_cong_map, .recv = rds_loop_recv, .conn_alloc = rds_loop_conn_alloc, .conn_free = rds_loop_conn_free, .conn_connect = rds_loop_conn_connect, .conn_shutdown = rds_loop_conn_shutdown, .inc_copy_to_user = rds_message_inc_copy_to_user, .inc_purge = rds_message_inc_purge, .inc_free = rds_message_inc_free, .t_name = "loopback", };