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349 lines
9.2 KiB
349 lines
9.2 KiB
/* |
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* Copyright (c) 2006, 2017 Oracle and/or its affiliates. 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/tcp.h> |
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#include "rds.h" |
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#include "tcp.h" |
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static struct kmem_cache *rds_tcp_incoming_slab; |
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static void rds_tcp_inc_purge(struct rds_incoming *inc) |
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{ |
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struct rds_tcp_incoming *tinc; |
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tinc = container_of(inc, struct rds_tcp_incoming, ti_inc); |
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rdsdebug("purging tinc %p inc %p\n", tinc, inc); |
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skb_queue_purge(&tinc->ti_skb_list); |
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} |
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void rds_tcp_inc_free(struct rds_incoming *inc) |
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{ |
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struct rds_tcp_incoming *tinc; |
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tinc = container_of(inc, struct rds_tcp_incoming, ti_inc); |
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rds_tcp_inc_purge(inc); |
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rdsdebug("freeing tinc %p inc %p\n", tinc, inc); |
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kmem_cache_free(rds_tcp_incoming_slab, tinc); |
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} |
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/* |
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* this is pretty lame, but, whatever. |
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*/ |
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int rds_tcp_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to) |
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{ |
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struct rds_tcp_incoming *tinc; |
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struct sk_buff *skb; |
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int ret = 0; |
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if (!iov_iter_count(to)) |
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goto out; |
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tinc = container_of(inc, struct rds_tcp_incoming, ti_inc); |
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skb_queue_walk(&tinc->ti_skb_list, skb) { |
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unsigned long to_copy, skb_off; |
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for (skb_off = 0; skb_off < skb->len; skb_off += to_copy) { |
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to_copy = iov_iter_count(to); |
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to_copy = min(to_copy, skb->len - skb_off); |
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if (skb_copy_datagram_iter(skb, skb_off, to, to_copy)) |
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return -EFAULT; |
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rds_stats_add(s_copy_to_user, to_copy); |
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ret += to_copy; |
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if (!iov_iter_count(to)) |
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goto out; |
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} |
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} |
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out: |
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return ret; |
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} |
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/* |
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* We have a series of skbs that have fragmented pieces of the congestion |
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* bitmap. They must add up to the exact size of the congestion bitmap. We |
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* use the skb helpers to copy those into the pages that make up the in-memory |
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* congestion bitmap for the remote address of this connection. We then tell |
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* the congestion core that the bitmap has been changed so that it can wake up |
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* sleepers. |
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* |
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* This is racing with sending paths which are using test_bit to see if the |
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* bitmap indicates that their recipient is congested. |
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*/ |
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static void rds_tcp_cong_recv(struct rds_connection *conn, |
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struct rds_tcp_incoming *tinc) |
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{ |
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struct sk_buff *skb; |
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unsigned int to_copy, skb_off; |
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unsigned int map_off; |
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unsigned int map_page; |
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struct rds_cong_map *map; |
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int ret; |
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/* catch completely corrupt packets */ |
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if (be32_to_cpu(tinc->ti_inc.i_hdr.h_len) != RDS_CONG_MAP_BYTES) |
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return; |
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map_page = 0; |
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map_off = 0; |
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map = conn->c_fcong; |
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skb_queue_walk(&tinc->ti_skb_list, skb) { |
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skb_off = 0; |
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while (skb_off < skb->len) { |
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to_copy = min_t(unsigned int, PAGE_SIZE - map_off, |
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skb->len - skb_off); |
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BUG_ON(map_page >= RDS_CONG_MAP_PAGES); |
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/* only returns 0 or -error */ |
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ret = skb_copy_bits(skb, skb_off, |
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(void *)map->m_page_addrs[map_page] + map_off, |
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to_copy); |
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BUG_ON(ret != 0); |
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skb_off += to_copy; |
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map_off += to_copy; |
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if (map_off == PAGE_SIZE) { |
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map_off = 0; |
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map_page++; |
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} |
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} |
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} |
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rds_cong_map_updated(map, ~(u64) 0); |
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} |
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struct rds_tcp_desc_arg { |
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struct rds_conn_path *conn_path; |
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gfp_t gfp; |
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}; |
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static int rds_tcp_data_recv(read_descriptor_t *desc, struct sk_buff *skb, |
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unsigned int offset, size_t len) |
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{ |
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struct rds_tcp_desc_arg *arg = desc->arg.data; |
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struct rds_conn_path *cp = arg->conn_path; |
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struct rds_tcp_connection *tc = cp->cp_transport_data; |
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struct rds_tcp_incoming *tinc = tc->t_tinc; |
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struct sk_buff *clone; |
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size_t left = len, to_copy; |
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rdsdebug("tcp data tc %p skb %p offset %u len %zu\n", tc, skb, offset, |
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len); |
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/* |
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* tcp_read_sock() interprets partial progress as an indication to stop |
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* processing. |
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*/ |
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while (left) { |
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if (!tinc) { |
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tinc = kmem_cache_alloc(rds_tcp_incoming_slab, |
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arg->gfp); |
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if (!tinc) { |
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desc->error = -ENOMEM; |
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goto out; |
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} |
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tc->t_tinc = tinc; |
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rdsdebug("allocated tinc %p\n", tinc); |
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rds_inc_path_init(&tinc->ti_inc, cp, |
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&cp->cp_conn->c_faddr); |
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tinc->ti_inc.i_rx_lat_trace[RDS_MSG_RX_HDR] = |
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local_clock(); |
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/* |
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* XXX * we might be able to use the __ variants when |
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* we've already serialized at a higher level. |
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*/ |
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skb_queue_head_init(&tinc->ti_skb_list); |
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} |
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if (left && tc->t_tinc_hdr_rem) { |
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to_copy = min(tc->t_tinc_hdr_rem, left); |
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rdsdebug("copying %zu header from skb %p\n", to_copy, |
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skb); |
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skb_copy_bits(skb, offset, |
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(char *)&tinc->ti_inc.i_hdr + |
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sizeof(struct rds_header) - |
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tc->t_tinc_hdr_rem, |
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to_copy); |
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tc->t_tinc_hdr_rem -= to_copy; |
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left -= to_copy; |
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offset += to_copy; |
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if (tc->t_tinc_hdr_rem == 0) { |
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/* could be 0 for a 0 len message */ |
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tc->t_tinc_data_rem = |
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be32_to_cpu(tinc->ti_inc.i_hdr.h_len); |
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tinc->ti_inc.i_rx_lat_trace[RDS_MSG_RX_START] = |
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local_clock(); |
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} |
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} |
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if (left && tc->t_tinc_data_rem) { |
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to_copy = min(tc->t_tinc_data_rem, left); |
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clone = pskb_extract(skb, offset, to_copy, arg->gfp); |
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if (!clone) { |
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desc->error = -ENOMEM; |
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goto out; |
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} |
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skb_queue_tail(&tinc->ti_skb_list, clone); |
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rdsdebug("skb %p data %p len %d off %u to_copy %zu -> " |
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"clone %p data %p len %d\n", |
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skb, skb->data, skb->len, offset, to_copy, |
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clone, clone->data, clone->len); |
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tc->t_tinc_data_rem -= to_copy; |
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left -= to_copy; |
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offset += to_copy; |
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} |
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if (tc->t_tinc_hdr_rem == 0 && tc->t_tinc_data_rem == 0) { |
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struct rds_connection *conn = cp->cp_conn; |
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if (tinc->ti_inc.i_hdr.h_flags == RDS_FLAG_CONG_BITMAP) |
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rds_tcp_cong_recv(conn, tinc); |
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else |
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rds_recv_incoming(conn, &conn->c_faddr, |
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&conn->c_laddr, |
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&tinc->ti_inc, |
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arg->gfp); |
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tc->t_tinc_hdr_rem = sizeof(struct rds_header); |
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tc->t_tinc_data_rem = 0; |
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tc->t_tinc = NULL; |
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rds_inc_put(&tinc->ti_inc); |
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tinc = NULL; |
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} |
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} |
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out: |
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rdsdebug("returning len %zu left %zu skb len %d rx queue depth %d\n", |
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len, left, skb->len, |
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skb_queue_len(&tc->t_sock->sk->sk_receive_queue)); |
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return len - left; |
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} |
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/* the caller has to hold the sock lock */ |
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static int rds_tcp_read_sock(struct rds_conn_path *cp, gfp_t gfp) |
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{ |
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struct rds_tcp_connection *tc = cp->cp_transport_data; |
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struct socket *sock = tc->t_sock; |
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read_descriptor_t desc; |
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struct rds_tcp_desc_arg arg; |
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/* It's like glib in the kernel! */ |
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arg.conn_path = cp; |
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arg.gfp = gfp; |
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desc.arg.data = &arg; |
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desc.error = 0; |
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desc.count = 1; /* give more than one skb per call */ |
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tcp_read_sock(sock->sk, &desc, rds_tcp_data_recv); |
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rdsdebug("tcp_read_sock for tc %p gfp 0x%x returned %d\n", tc, gfp, |
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desc.error); |
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return desc.error; |
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} |
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/* |
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* We hold the sock lock to serialize our rds_tcp_recv->tcp_read_sock from |
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* data_ready. |
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* |
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* if we fail to allocate we're in trouble.. blindly wait some time before |
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* trying again to see if the VM can free up something for us. |
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*/ |
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int rds_tcp_recv_path(struct rds_conn_path *cp) |
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{ |
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struct rds_tcp_connection *tc = cp->cp_transport_data; |
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struct socket *sock = tc->t_sock; |
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int ret = 0; |
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rdsdebug("recv worker path [%d] tc %p sock %p\n", |
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cp->cp_index, tc, sock); |
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lock_sock(sock->sk); |
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ret = rds_tcp_read_sock(cp, GFP_KERNEL); |
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release_sock(sock->sk); |
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return ret; |
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} |
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void rds_tcp_data_ready(struct sock *sk) |
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{ |
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void (*ready)(struct sock *sk); |
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struct rds_conn_path *cp; |
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struct rds_tcp_connection *tc; |
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rdsdebug("data ready sk %p\n", sk); |
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read_lock_bh(&sk->sk_callback_lock); |
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cp = sk->sk_user_data; |
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if (!cp) { /* check for teardown race */ |
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ready = sk->sk_data_ready; |
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goto out; |
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} |
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tc = cp->cp_transport_data; |
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ready = tc->t_orig_data_ready; |
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rds_tcp_stats_inc(s_tcp_data_ready_calls); |
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if (rds_tcp_read_sock(cp, GFP_ATOMIC) == -ENOMEM) { |
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rcu_read_lock(); |
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if (!rds_destroy_pending(cp->cp_conn)) |
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queue_delayed_work(rds_wq, &cp->cp_recv_w, 0); |
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rcu_read_unlock(); |
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} |
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out: |
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read_unlock_bh(&sk->sk_callback_lock); |
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ready(sk); |
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} |
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int rds_tcp_recv_init(void) |
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{ |
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rds_tcp_incoming_slab = kmem_cache_create("rds_tcp_incoming", |
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sizeof(struct rds_tcp_incoming), |
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0, 0, NULL); |
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if (!rds_tcp_incoming_slab) |
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return -ENOMEM; |
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return 0; |
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} |
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void rds_tcp_recv_exit(void) |
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{ |
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kmem_cache_destroy(rds_tcp_incoming_slab); |
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}
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