772 строки
22 KiB
C
772 строки
22 KiB
C
/*
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* Copyright (c) 2006 Oracle. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <net/sock.h>
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#include <linux/in.h>
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#include <linux/export.h>
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#include <linux/time.h>
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#include <linux/rds.h>
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#include "rds.h"
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void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
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__be32 saddr)
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{
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int i;
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refcount_set(&inc->i_refcount, 1);
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INIT_LIST_HEAD(&inc->i_item);
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inc->i_conn = conn;
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inc->i_saddr = saddr;
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inc->i_rdma_cookie = 0;
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inc->i_rx_tstamp.tv_sec = 0;
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inc->i_rx_tstamp.tv_usec = 0;
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for (i = 0; i < RDS_RX_MAX_TRACES; i++)
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inc->i_rx_lat_trace[i] = 0;
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}
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EXPORT_SYMBOL_GPL(rds_inc_init);
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void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *cp,
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__be32 saddr)
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{
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refcount_set(&inc->i_refcount, 1);
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INIT_LIST_HEAD(&inc->i_item);
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inc->i_conn = cp->cp_conn;
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inc->i_conn_path = cp;
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inc->i_saddr = saddr;
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inc->i_rdma_cookie = 0;
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inc->i_rx_tstamp.tv_sec = 0;
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inc->i_rx_tstamp.tv_usec = 0;
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}
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EXPORT_SYMBOL_GPL(rds_inc_path_init);
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static void rds_inc_addref(struct rds_incoming *inc)
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{
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rdsdebug("addref inc %p ref %d\n", inc, refcount_read(&inc->i_refcount));
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refcount_inc(&inc->i_refcount);
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}
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void rds_inc_put(struct rds_incoming *inc)
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{
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rdsdebug("put inc %p ref %d\n", inc, refcount_read(&inc->i_refcount));
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if (refcount_dec_and_test(&inc->i_refcount)) {
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BUG_ON(!list_empty(&inc->i_item));
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inc->i_conn->c_trans->inc_free(inc);
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}
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}
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EXPORT_SYMBOL_GPL(rds_inc_put);
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static void rds_recv_rcvbuf_delta(struct rds_sock *rs, struct sock *sk,
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struct rds_cong_map *map,
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int delta, __be16 port)
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{
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int now_congested;
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if (delta == 0)
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return;
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rs->rs_rcv_bytes += delta;
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if (delta > 0)
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rds_stats_add(s_recv_bytes_added_to_socket, delta);
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else
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rds_stats_add(s_recv_bytes_removed_from_socket, -delta);
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now_congested = rs->rs_rcv_bytes > rds_sk_rcvbuf(rs);
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rdsdebug("rs %p (%pI4:%u) recv bytes %d buf %d "
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"now_cong %d delta %d\n",
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rs, &rs->rs_bound_addr,
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ntohs(rs->rs_bound_port), rs->rs_rcv_bytes,
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rds_sk_rcvbuf(rs), now_congested, delta);
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/* wasn't -> am congested */
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if (!rs->rs_congested && now_congested) {
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rs->rs_congested = 1;
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rds_cong_set_bit(map, port);
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rds_cong_queue_updates(map);
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}
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/* was -> aren't congested */
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/* Require more free space before reporting uncongested to prevent
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bouncing cong/uncong state too often */
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else if (rs->rs_congested && (rs->rs_rcv_bytes < (rds_sk_rcvbuf(rs)/2))) {
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rs->rs_congested = 0;
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rds_cong_clear_bit(map, port);
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rds_cong_queue_updates(map);
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}
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/* do nothing if no change in cong state */
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}
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static void rds_conn_peer_gen_update(struct rds_connection *conn,
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u32 peer_gen_num)
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{
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int i;
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struct rds_message *rm, *tmp;
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unsigned long flags;
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WARN_ON(conn->c_trans->t_type != RDS_TRANS_TCP);
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if (peer_gen_num != 0) {
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if (conn->c_peer_gen_num != 0 &&
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peer_gen_num != conn->c_peer_gen_num) {
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for (i = 0; i < RDS_MPATH_WORKERS; i++) {
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struct rds_conn_path *cp;
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cp = &conn->c_path[i];
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spin_lock_irqsave(&cp->cp_lock, flags);
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cp->cp_next_tx_seq = 1;
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cp->cp_next_rx_seq = 0;
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list_for_each_entry_safe(rm, tmp,
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&cp->cp_retrans,
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m_conn_item) {
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set_bit(RDS_MSG_FLUSH, &rm->m_flags);
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}
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spin_unlock_irqrestore(&cp->cp_lock, flags);
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}
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}
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conn->c_peer_gen_num = peer_gen_num;
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}
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}
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/*
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* Process all extension headers that come with this message.
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*/
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static void rds_recv_incoming_exthdrs(struct rds_incoming *inc, struct rds_sock *rs)
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{
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struct rds_header *hdr = &inc->i_hdr;
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unsigned int pos = 0, type, len;
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union {
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struct rds_ext_header_version version;
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struct rds_ext_header_rdma rdma;
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struct rds_ext_header_rdma_dest rdma_dest;
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} buffer;
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while (1) {
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len = sizeof(buffer);
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type = rds_message_next_extension(hdr, &pos, &buffer, &len);
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if (type == RDS_EXTHDR_NONE)
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break;
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/* Process extension header here */
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switch (type) {
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case RDS_EXTHDR_RDMA:
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rds_rdma_unuse(rs, be32_to_cpu(buffer.rdma.h_rdma_rkey), 0);
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break;
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case RDS_EXTHDR_RDMA_DEST:
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/* We ignore the size for now. We could stash it
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* somewhere and use it for error checking. */
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inc->i_rdma_cookie = rds_rdma_make_cookie(
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be32_to_cpu(buffer.rdma_dest.h_rdma_rkey),
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be32_to_cpu(buffer.rdma_dest.h_rdma_offset));
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break;
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}
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}
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}
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static void rds_recv_hs_exthdrs(struct rds_header *hdr,
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struct rds_connection *conn)
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{
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unsigned int pos = 0, type, len;
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union {
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struct rds_ext_header_version version;
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u16 rds_npaths;
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u32 rds_gen_num;
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} buffer;
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u32 new_peer_gen_num = 0;
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while (1) {
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len = sizeof(buffer);
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type = rds_message_next_extension(hdr, &pos, &buffer, &len);
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if (type == RDS_EXTHDR_NONE)
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break;
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/* Process extension header here */
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switch (type) {
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case RDS_EXTHDR_NPATHS:
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conn->c_npaths = min_t(int, RDS_MPATH_WORKERS,
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be16_to_cpu(buffer.rds_npaths));
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break;
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case RDS_EXTHDR_GEN_NUM:
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new_peer_gen_num = be32_to_cpu(buffer.rds_gen_num);
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break;
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default:
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pr_warn_ratelimited("ignoring unknown exthdr type "
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"0x%x\n", type);
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}
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}
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/* if RDS_EXTHDR_NPATHS was not found, default to a single-path */
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conn->c_npaths = max_t(int, conn->c_npaths, 1);
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conn->c_ping_triggered = 0;
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rds_conn_peer_gen_update(conn, new_peer_gen_num);
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}
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/* rds_start_mprds() will synchronously start multiple paths when appropriate.
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* The scheme is based on the following rules:
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*
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* 1. rds_sendmsg on first connect attempt sends the probe ping, with the
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* sender's npaths (s_npaths)
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* 2. rcvr of probe-ping knows the mprds_paths = min(s_npaths, r_npaths). It
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* sends back a probe-pong with r_npaths. After that, if rcvr is the
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* smaller ip addr, it starts rds_conn_path_connect_if_down on all
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* mprds_paths.
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* 3. sender gets woken up, and can move to rds_conn_path_connect_if_down.
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* If it is the smaller ipaddr, rds_conn_path_connect_if_down can be
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* called after reception of the probe-pong on all mprds_paths.
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* Otherwise (sender of probe-ping is not the smaller ip addr): just call
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* rds_conn_path_connect_if_down on the hashed path. (see rule 4)
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* 4. rds_connect_worker must only trigger a connection if laddr < faddr.
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* 5. sender may end up queuing the packet on the cp. will get sent out later.
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* when connection is completed.
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*/
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static void rds_start_mprds(struct rds_connection *conn)
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{
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int i;
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struct rds_conn_path *cp;
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if (conn->c_npaths > 1 &&
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IS_CANONICAL(conn->c_laddr, conn->c_faddr)) {
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for (i = 0; i < conn->c_npaths; i++) {
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cp = &conn->c_path[i];
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rds_conn_path_connect_if_down(cp);
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}
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}
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}
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/*
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* The transport must make sure that this is serialized against other
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* rx and conn reset on this specific conn.
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*
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* We currently assert that only one fragmented message will be sent
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* down a connection at a time. This lets us reassemble in the conn
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* instead of per-flow which means that we don't have to go digging through
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* flows to tear down partial reassembly progress on conn failure and
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* we save flow lookup and locking for each frag arrival. It does mean
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* that small messages will wait behind large ones. Fragmenting at all
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* is only to reduce the memory consumption of pre-posted buffers.
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*
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* The caller passes in saddr and daddr instead of us getting it from the
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* conn. This lets loopback, who only has one conn for both directions,
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* tell us which roles the addrs in the conn are playing for this message.
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*/
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void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
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struct rds_incoming *inc, gfp_t gfp)
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{
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struct rds_sock *rs = NULL;
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struct sock *sk;
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unsigned long flags;
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struct rds_conn_path *cp;
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inc->i_conn = conn;
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inc->i_rx_jiffies = jiffies;
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if (conn->c_trans->t_mp_capable)
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cp = inc->i_conn_path;
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else
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cp = &conn->c_path[0];
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rdsdebug("conn %p next %llu inc %p seq %llu len %u sport %u dport %u "
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"flags 0x%x rx_jiffies %lu\n", conn,
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(unsigned long long)cp->cp_next_rx_seq,
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inc,
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(unsigned long long)be64_to_cpu(inc->i_hdr.h_sequence),
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be32_to_cpu(inc->i_hdr.h_len),
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be16_to_cpu(inc->i_hdr.h_sport),
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be16_to_cpu(inc->i_hdr.h_dport),
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inc->i_hdr.h_flags,
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inc->i_rx_jiffies);
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/*
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* Sequence numbers should only increase. Messages get their
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* sequence number as they're queued in a sending conn. They
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* can be dropped, though, if the sending socket is closed before
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* they hit the wire. So sequence numbers can skip forward
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* under normal operation. They can also drop back in the conn
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* failover case as previously sent messages are resent down the
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* new instance of a conn. We drop those, otherwise we have
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* to assume that the next valid seq does not come after a
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* hole in the fragment stream.
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*
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* The headers don't give us a way to realize if fragments of
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* a message have been dropped. We assume that frags that arrive
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* to a flow are part of the current message on the flow that is
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* being reassembled. This means that senders can't drop messages
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* from the sending conn until all their frags are sent.
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*
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* XXX we could spend more on the wire to get more robust failure
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* detection, arguably worth it to avoid data corruption.
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*/
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if (be64_to_cpu(inc->i_hdr.h_sequence) < cp->cp_next_rx_seq &&
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(inc->i_hdr.h_flags & RDS_FLAG_RETRANSMITTED)) {
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rds_stats_inc(s_recv_drop_old_seq);
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goto out;
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}
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cp->cp_next_rx_seq = be64_to_cpu(inc->i_hdr.h_sequence) + 1;
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if (rds_sysctl_ping_enable && inc->i_hdr.h_dport == 0) {
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if (inc->i_hdr.h_sport == 0) {
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rdsdebug("ignore ping with 0 sport from 0x%x\n", saddr);
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goto out;
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}
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rds_stats_inc(s_recv_ping);
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rds_send_pong(cp, inc->i_hdr.h_sport);
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/* if this is a handshake ping, start multipath if necessary */
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if (RDS_HS_PROBE(be16_to_cpu(inc->i_hdr.h_sport),
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be16_to_cpu(inc->i_hdr.h_dport))) {
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rds_recv_hs_exthdrs(&inc->i_hdr, cp->cp_conn);
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rds_start_mprds(cp->cp_conn);
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}
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goto out;
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}
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if (be16_to_cpu(inc->i_hdr.h_dport) == RDS_FLAG_PROBE_PORT &&
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inc->i_hdr.h_sport == 0) {
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rds_recv_hs_exthdrs(&inc->i_hdr, cp->cp_conn);
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/* if this is a handshake pong, start multipath if necessary */
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rds_start_mprds(cp->cp_conn);
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wake_up(&cp->cp_conn->c_hs_waitq);
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goto out;
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}
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rs = rds_find_bound(daddr, inc->i_hdr.h_dport);
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if (!rs) {
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rds_stats_inc(s_recv_drop_no_sock);
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goto out;
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}
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/* Process extension headers */
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rds_recv_incoming_exthdrs(inc, rs);
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/* We can be racing with rds_release() which marks the socket dead. */
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sk = rds_rs_to_sk(rs);
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/* serialize with rds_release -> sock_orphan */
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write_lock_irqsave(&rs->rs_recv_lock, flags);
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if (!sock_flag(sk, SOCK_DEAD)) {
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rdsdebug("adding inc %p to rs %p's recv queue\n", inc, rs);
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rds_stats_inc(s_recv_queued);
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rds_recv_rcvbuf_delta(rs, sk, inc->i_conn->c_lcong,
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be32_to_cpu(inc->i_hdr.h_len),
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inc->i_hdr.h_dport);
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if (sock_flag(sk, SOCK_RCVTSTAMP))
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do_gettimeofday(&inc->i_rx_tstamp);
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rds_inc_addref(inc);
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inc->i_rx_lat_trace[RDS_MSG_RX_END] = local_clock();
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list_add_tail(&inc->i_item, &rs->rs_recv_queue);
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__rds_wake_sk_sleep(sk);
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} else {
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rds_stats_inc(s_recv_drop_dead_sock);
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}
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write_unlock_irqrestore(&rs->rs_recv_lock, flags);
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out:
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if (rs)
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rds_sock_put(rs);
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}
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EXPORT_SYMBOL_GPL(rds_recv_incoming);
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/*
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* be very careful here. This is being called as the condition in
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* wait_event_*() needs to cope with being called many times.
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*/
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static int rds_next_incoming(struct rds_sock *rs, struct rds_incoming **inc)
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{
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unsigned long flags;
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if (!*inc) {
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read_lock_irqsave(&rs->rs_recv_lock, flags);
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if (!list_empty(&rs->rs_recv_queue)) {
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*inc = list_entry(rs->rs_recv_queue.next,
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struct rds_incoming,
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i_item);
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rds_inc_addref(*inc);
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}
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read_unlock_irqrestore(&rs->rs_recv_lock, flags);
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}
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return *inc != NULL;
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}
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static int rds_still_queued(struct rds_sock *rs, struct rds_incoming *inc,
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int drop)
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{
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struct sock *sk = rds_rs_to_sk(rs);
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int ret = 0;
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unsigned long flags;
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write_lock_irqsave(&rs->rs_recv_lock, flags);
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if (!list_empty(&inc->i_item)) {
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ret = 1;
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if (drop) {
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/* XXX make sure this i_conn is reliable */
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rds_recv_rcvbuf_delta(rs, sk, inc->i_conn->c_lcong,
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-be32_to_cpu(inc->i_hdr.h_len),
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inc->i_hdr.h_dport);
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list_del_init(&inc->i_item);
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rds_inc_put(inc);
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}
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}
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write_unlock_irqrestore(&rs->rs_recv_lock, flags);
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rdsdebug("inc %p rs %p still %d dropped %d\n", inc, rs, ret, drop);
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return ret;
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}
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/*
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* Pull errors off the error queue.
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* If msghdr is NULL, we will just purge the error queue.
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*/
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int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msghdr)
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{
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struct rds_notifier *notifier;
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struct rds_rdma_notify cmsg = { 0 }; /* fill holes with zero */
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unsigned int count = 0, max_messages = ~0U;
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|
unsigned long flags;
|
|
LIST_HEAD(copy);
|
|
int err = 0;
|
|
|
|
|
|
/* put_cmsg copies to user space and thus may sleep. We can't do this
|
|
* with rs_lock held, so first grab as many notifications as we can stuff
|
|
* in the user provided cmsg buffer. We don't try to copy more, to avoid
|
|
* losing notifications - except when the buffer is so small that it wouldn't
|
|
* even hold a single notification. Then we give him as much of this single
|
|
* msg as we can squeeze in, and set MSG_CTRUNC.
|
|
*/
|
|
if (msghdr) {
|
|
max_messages = msghdr->msg_controllen / CMSG_SPACE(sizeof(cmsg));
|
|
if (!max_messages)
|
|
max_messages = 1;
|
|
}
|
|
|
|
spin_lock_irqsave(&rs->rs_lock, flags);
|
|
while (!list_empty(&rs->rs_notify_queue) && count < max_messages) {
|
|
notifier = list_entry(rs->rs_notify_queue.next,
|
|
struct rds_notifier, n_list);
|
|
list_move(¬ifier->n_list, ©);
|
|
count++;
|
|
}
|
|
spin_unlock_irqrestore(&rs->rs_lock, flags);
|
|
|
|
if (!count)
|
|
return 0;
|
|
|
|
while (!list_empty(©)) {
|
|
notifier = list_entry(copy.next, struct rds_notifier, n_list);
|
|
|
|
if (msghdr) {
|
|
cmsg.user_token = notifier->n_user_token;
|
|
cmsg.status = notifier->n_status;
|
|
|
|
err = put_cmsg(msghdr, SOL_RDS, RDS_CMSG_RDMA_STATUS,
|
|
sizeof(cmsg), &cmsg);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
list_del_init(¬ifier->n_list);
|
|
kfree(notifier);
|
|
}
|
|
|
|
/* If we bailed out because of an error in put_cmsg,
|
|
* we may be left with one or more notifications that we
|
|
* didn't process. Return them to the head of the list. */
|
|
if (!list_empty(©)) {
|
|
spin_lock_irqsave(&rs->rs_lock, flags);
|
|
list_splice(©, &rs->rs_notify_queue);
|
|
spin_unlock_irqrestore(&rs->rs_lock, flags);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Queue a congestion notification
|
|
*/
|
|
static int rds_notify_cong(struct rds_sock *rs, struct msghdr *msghdr)
|
|
{
|
|
uint64_t notify = rs->rs_cong_notify;
|
|
unsigned long flags;
|
|
int err;
|
|
|
|
err = put_cmsg(msghdr, SOL_RDS, RDS_CMSG_CONG_UPDATE,
|
|
sizeof(notify), ¬ify);
|
|
if (err)
|
|
return err;
|
|
|
|
spin_lock_irqsave(&rs->rs_lock, flags);
|
|
rs->rs_cong_notify &= ~notify;
|
|
spin_unlock_irqrestore(&rs->rs_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Receive any control messages.
|
|
*/
|
|
static int rds_cmsg_recv(struct rds_incoming *inc, struct msghdr *msg,
|
|
struct rds_sock *rs)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (inc->i_rdma_cookie) {
|
|
ret = put_cmsg(msg, SOL_RDS, RDS_CMSG_RDMA_DEST,
|
|
sizeof(inc->i_rdma_cookie), &inc->i_rdma_cookie);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if ((inc->i_rx_tstamp.tv_sec != 0) &&
|
|
sock_flag(rds_rs_to_sk(rs), SOCK_RCVTSTAMP)) {
|
|
ret = put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
|
|
sizeof(struct timeval),
|
|
&inc->i_rx_tstamp);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (rs->rs_rx_traces) {
|
|
struct rds_cmsg_rx_trace t;
|
|
int i, j;
|
|
|
|
inc->i_rx_lat_trace[RDS_MSG_RX_CMSG] = local_clock();
|
|
t.rx_traces = rs->rs_rx_traces;
|
|
for (i = 0; i < rs->rs_rx_traces; i++) {
|
|
j = rs->rs_rx_trace[i];
|
|
t.rx_trace_pos[i] = j;
|
|
t.rx_trace[i] = inc->i_rx_lat_trace[j + 1] -
|
|
inc->i_rx_lat_trace[j];
|
|
}
|
|
|
|
ret = put_cmsg(msg, SOL_RDS, RDS_CMSG_RXPATH_LATENCY,
|
|
sizeof(t), &t);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static bool rds_recvmsg_zcookie(struct rds_sock *rs, struct msghdr *msg)
|
|
{
|
|
struct rds_msg_zcopy_queue *q = &rs->rs_zcookie_queue;
|
|
struct rds_msg_zcopy_info *info = NULL;
|
|
struct rds_zcopy_cookies *done;
|
|
unsigned long flags;
|
|
|
|
if (!msg->msg_control)
|
|
return false;
|
|
|
|
if (!sock_flag(rds_rs_to_sk(rs), SOCK_ZEROCOPY) ||
|
|
msg->msg_controllen < CMSG_SPACE(sizeof(*done)))
|
|
return false;
|
|
|
|
spin_lock_irqsave(&q->lock, flags);
|
|
if (!list_empty(&q->zcookie_head)) {
|
|
info = list_entry(q->zcookie_head.next,
|
|
struct rds_msg_zcopy_info, rs_zcookie_next);
|
|
list_del(&info->rs_zcookie_next);
|
|
}
|
|
spin_unlock_irqrestore(&q->lock, flags);
|
|
if (!info)
|
|
return false;
|
|
done = &info->zcookies;
|
|
if (put_cmsg(msg, SOL_RDS, RDS_CMSG_ZCOPY_COMPLETION, sizeof(*done),
|
|
done)) {
|
|
spin_lock_irqsave(&q->lock, flags);
|
|
list_add(&info->rs_zcookie_next, &q->zcookie_head);
|
|
spin_unlock_irqrestore(&q->lock, flags);
|
|
return false;
|
|
}
|
|
kfree(info);
|
|
return true;
|
|
}
|
|
|
|
int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
|
|
int msg_flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct rds_sock *rs = rds_sk_to_rs(sk);
|
|
long timeo;
|
|
int ret = 0, nonblock = msg_flags & MSG_DONTWAIT;
|
|
DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
|
|
struct rds_incoming *inc = NULL;
|
|
|
|
/* udp_recvmsg()->sock_recvtimeo() gets away without locking too.. */
|
|
timeo = sock_rcvtimeo(sk, nonblock);
|
|
|
|
rdsdebug("size %zu flags 0x%x timeo %ld\n", size, msg_flags, timeo);
|
|
|
|
if (msg_flags & MSG_OOB)
|
|
goto out;
|
|
if (msg_flags & MSG_ERRQUEUE)
|
|
return sock_recv_errqueue(sk, msg, size, SOL_IP, IP_RECVERR);
|
|
|
|
while (1) {
|
|
/* If there are pending notifications, do those - and nothing else */
|
|
if (!list_empty(&rs->rs_notify_queue)) {
|
|
ret = rds_notify_queue_get(rs, msg);
|
|
break;
|
|
}
|
|
|
|
if (rs->rs_cong_notify) {
|
|
ret = rds_notify_cong(rs, msg);
|
|
break;
|
|
}
|
|
|
|
if (!rds_next_incoming(rs, &inc)) {
|
|
if (nonblock) {
|
|
bool reaped = rds_recvmsg_zcookie(rs, msg);
|
|
|
|
ret = reaped ? 0 : -EAGAIN;
|
|
break;
|
|
}
|
|
|
|
timeo = wait_event_interruptible_timeout(*sk_sleep(sk),
|
|
(!list_empty(&rs->rs_notify_queue) ||
|
|
rs->rs_cong_notify ||
|
|
rds_next_incoming(rs, &inc)), timeo);
|
|
rdsdebug("recvmsg woke inc %p timeo %ld\n", inc,
|
|
timeo);
|
|
if (timeo > 0 || timeo == MAX_SCHEDULE_TIMEOUT)
|
|
continue;
|
|
|
|
ret = timeo;
|
|
if (ret == 0)
|
|
ret = -ETIMEDOUT;
|
|
break;
|
|
}
|
|
|
|
rdsdebug("copying inc %p from %pI4:%u to user\n", inc,
|
|
&inc->i_conn->c_faddr,
|
|
ntohs(inc->i_hdr.h_sport));
|
|
ret = inc->i_conn->c_trans->inc_copy_to_user(inc, &msg->msg_iter);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
/*
|
|
* if the message we just copied isn't at the head of the
|
|
* recv queue then someone else raced us to return it, try
|
|
* to get the next message.
|
|
*/
|
|
if (!rds_still_queued(rs, inc, !(msg_flags & MSG_PEEK))) {
|
|
rds_inc_put(inc);
|
|
inc = NULL;
|
|
rds_stats_inc(s_recv_deliver_raced);
|
|
iov_iter_revert(&msg->msg_iter, ret);
|
|
continue;
|
|
}
|
|
|
|
if (ret < be32_to_cpu(inc->i_hdr.h_len)) {
|
|
if (msg_flags & MSG_TRUNC)
|
|
ret = be32_to_cpu(inc->i_hdr.h_len);
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
}
|
|
|
|
if (rds_cmsg_recv(inc, msg, rs)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
rds_recvmsg_zcookie(rs, msg);
|
|
|
|
rds_stats_inc(s_recv_delivered);
|
|
|
|
if (sin) {
|
|
sin->sin_family = AF_INET;
|
|
sin->sin_port = inc->i_hdr.h_sport;
|
|
sin->sin_addr.s_addr = inc->i_saddr;
|
|
memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
|
|
msg->msg_namelen = sizeof(*sin);
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (inc)
|
|
rds_inc_put(inc);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* The socket is being shut down and we're asked to drop messages that were
|
|
* queued for recvmsg. The caller has unbound the socket so the receive path
|
|
* won't queue any more incoming fragments or messages on the socket.
|
|
*/
|
|
void rds_clear_recv_queue(struct rds_sock *rs)
|
|
{
|
|
struct sock *sk = rds_rs_to_sk(rs);
|
|
struct rds_incoming *inc, *tmp;
|
|
unsigned long flags;
|
|
|
|
write_lock_irqsave(&rs->rs_recv_lock, flags);
|
|
list_for_each_entry_safe(inc, tmp, &rs->rs_recv_queue, i_item) {
|
|
rds_recv_rcvbuf_delta(rs, sk, inc->i_conn->c_lcong,
|
|
-be32_to_cpu(inc->i_hdr.h_len),
|
|
inc->i_hdr.h_dport);
|
|
list_del_init(&inc->i_item);
|
|
rds_inc_put(inc);
|
|
}
|
|
write_unlock_irqrestore(&rs->rs_recv_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* inc->i_saddr isn't used here because it is only set in the receive
|
|
* path.
|
|
*/
|
|
void rds_inc_info_copy(struct rds_incoming *inc,
|
|
struct rds_info_iterator *iter,
|
|
__be32 saddr, __be32 daddr, int flip)
|
|
{
|
|
struct rds_info_message minfo;
|
|
|
|
minfo.seq = be64_to_cpu(inc->i_hdr.h_sequence);
|
|
minfo.len = be32_to_cpu(inc->i_hdr.h_len);
|
|
|
|
if (flip) {
|
|
minfo.laddr = daddr;
|
|
minfo.faddr = saddr;
|
|
minfo.lport = inc->i_hdr.h_dport;
|
|
minfo.fport = inc->i_hdr.h_sport;
|
|
} else {
|
|
minfo.laddr = saddr;
|
|
minfo.faddr = daddr;
|
|
minfo.lport = inc->i_hdr.h_sport;
|
|
minfo.fport = inc->i_hdr.h_dport;
|
|
}
|
|
|
|
minfo.flags = 0;
|
|
|
|
rds_info_copy(iter, &minfo, sizeof(minfo));
|
|
}
|