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net/rds/loop.c
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/* * 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> |
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#include <linux/slab.h> |
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#include <linux/in.h> |
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#include "rds_single_path.h" |
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#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) { |
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struct scatterlist *sgp = &rm->data.op_sg[sg]; int ret = sizeof(struct rds_header) + be32_to_cpu(rm->m_inc.i_hdr.h_len); |
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/* Do not send cong updates to loopback */ if (rm->m_inc.i_hdr.h_flags & RDS_FLAG_CONG_BITMAP) { rds_cong_map_updated(conn->c_fcong, ~(u64) 0); |
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ret = min_t(int, ret, sgp->length - conn->c_xmit_data_off); goto out; |
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} |
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BUG_ON(hdr_off || sg || off); rds_inc_init(&rm->m_inc, conn, conn->c_laddr); |
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/* For the embedded inc. Matching put is in loop_inc_free() */ rds_message_addref(rm); |
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rds_recv_incoming(conn, conn->c_laddr, conn->c_faddr, &rm->m_inc, |
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GFP_KERNEL); |
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rds_send_drop_acked(conn, be64_to_cpu(rm->m_inc.i_hdr.h_sequence), NULL); rds_inc_put(&rm->m_inc); |
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out: return ret; |
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} |
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/* * See rds_loop_xmit(). Since our inc is embedded in the rm, we * make sure the rm lives at least until the inc is done. */ static void rds_loop_inc_free(struct rds_incoming *inc) { |
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struct rds_message *rm = container_of(inc, struct rds_message, m_inc); rds_message_put(rm); |
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} |
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/* we need to at least give the thread something to succeed */ |
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static int rds_loop_recv_path(struct rds_conn_path *cp) |
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{ 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; |
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lc = kzalloc(sizeof(struct rds_loop_connection), gfp); |
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if (!lc) |
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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; |
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unsigned long flags; |
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rdsdebug("lc %p ", lc); |
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spin_lock_irqsave(&loop_conns_lock, flags); |
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list_del(&lc->loop_node); |
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spin_unlock_irqrestore(&loop_conns_lock, flags); |
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kfree(lc); } |
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static int rds_loop_conn_path_connect(struct rds_conn_path *cp) |
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{ |
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rds_connect_complete(cp->cp_conn); |
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return 0; } |
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static void rds_loop_conn_path_shutdown(struct rds_conn_path *cp) |
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{ } 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, |
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.recv_path = rds_loop_recv_path, |
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.conn_alloc = rds_loop_conn_alloc, .conn_free = rds_loop_conn_free, |
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.conn_path_connect = rds_loop_conn_path_connect, |
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.conn_path_shutdown = rds_loop_conn_path_shutdown, |
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.inc_copy_to_user = rds_message_inc_copy_to_user, |
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.inc_free = rds_loop_inc_free, |
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.t_name = "loopback", |
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.t_type = RDS_TRANS_LOOP, |
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}; |