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226f7a7d97
Refactor code to avoid separate indirections for single-path and multipath transports. All transports (both single and mp-capable) will get a pointer to the rds_conn_path, and can trivially derive the rds_connection from the ->cp_conn. Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1188 lines
32 KiB
C
1188 lines
32 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/moduleparam.h>
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#include <linux/gfp.h>
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#include <net/sock.h>
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#include <linux/in.h>
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#include <linux/list.h>
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#include <linux/ratelimit.h>
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#include <linux/export.h>
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#include <linux/sizes.h>
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#include "rds.h"
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/* When transmitting messages in rds_send_xmit, we need to emerge from
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* time to time and briefly release the CPU. Otherwise the softlock watchdog
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* will kick our shin.
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* Also, it seems fairer to not let one busy connection stall all the
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* others.
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*
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* send_batch_count is the number of times we'll loop in send_xmit. Setting
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* it to 0 will restore the old behavior (where we looped until we had
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* drained the queue).
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*/
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static int send_batch_count = SZ_1K;
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module_param(send_batch_count, int, 0444);
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MODULE_PARM_DESC(send_batch_count, " batch factor when working the send queue");
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static void rds_send_remove_from_sock(struct list_head *messages, int status);
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/*
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* Reset the send state. Callers must ensure that this doesn't race with
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* rds_send_xmit().
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*/
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void rds_send_path_reset(struct rds_conn_path *cp)
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{
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struct rds_message *rm, *tmp;
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unsigned long flags;
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if (cp->cp_xmit_rm) {
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rm = cp->cp_xmit_rm;
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cp->cp_xmit_rm = NULL;
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/* Tell the user the RDMA op is no longer mapped by the
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* transport. This isn't entirely true (it's flushed out
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* independently) but as the connection is down, there's
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* no ongoing RDMA to/from that memory */
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rds_message_unmapped(rm);
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rds_message_put(rm);
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}
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cp->cp_xmit_sg = 0;
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cp->cp_xmit_hdr_off = 0;
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cp->cp_xmit_data_off = 0;
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cp->cp_xmit_atomic_sent = 0;
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cp->cp_xmit_rdma_sent = 0;
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cp->cp_xmit_data_sent = 0;
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cp->cp_conn->c_map_queued = 0;
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cp->cp_unacked_packets = rds_sysctl_max_unacked_packets;
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cp->cp_unacked_bytes = rds_sysctl_max_unacked_bytes;
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/* Mark messages as retransmissions, and move them to the send q */
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spin_lock_irqsave(&cp->cp_lock, flags);
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list_for_each_entry_safe(rm, tmp, &cp->cp_retrans, m_conn_item) {
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set_bit(RDS_MSG_ACK_REQUIRED, &rm->m_flags);
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set_bit(RDS_MSG_RETRANSMITTED, &rm->m_flags);
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}
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list_splice_init(&cp->cp_retrans, &cp->cp_send_queue);
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spin_unlock_irqrestore(&cp->cp_lock, flags);
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}
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EXPORT_SYMBOL_GPL(rds_send_path_reset);
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static int acquire_in_xmit(struct rds_conn_path *cp)
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{
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return test_and_set_bit(RDS_IN_XMIT, &cp->cp_flags) == 0;
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}
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static void release_in_xmit(struct rds_conn_path *cp)
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{
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clear_bit(RDS_IN_XMIT, &cp->cp_flags);
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smp_mb__after_atomic();
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/*
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* We don't use wait_on_bit()/wake_up_bit() because our waking is in a
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* hot path and finding waiters is very rare. We don't want to walk
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* the system-wide hashed waitqueue buckets in the fast path only to
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* almost never find waiters.
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*/
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if (waitqueue_active(&cp->cp_waitq))
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wake_up_all(&cp->cp_waitq);
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}
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/*
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* We're making the conscious trade-off here to only send one message
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* down the connection at a time.
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* Pro:
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* - tx queueing is a simple fifo list
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* - reassembly is optional and easily done by transports per conn
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* - no per flow rx lookup at all, straight to the socket
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* - less per-frag memory and wire overhead
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* Con:
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* - queued acks can be delayed behind large messages
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* Depends:
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* - small message latency is higher behind queued large messages
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* - large message latency isn't starved by intervening small sends
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*/
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int rds_send_xmit(struct rds_conn_path *cp)
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{
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struct rds_connection *conn = cp->cp_conn;
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struct rds_message *rm;
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unsigned long flags;
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unsigned int tmp;
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struct scatterlist *sg;
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int ret = 0;
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LIST_HEAD(to_be_dropped);
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int batch_count;
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unsigned long send_gen = 0;
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restart:
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batch_count = 0;
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/*
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* sendmsg calls here after having queued its message on the send
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* queue. We only have one task feeding the connection at a time. If
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* another thread is already feeding the queue then we back off. This
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* avoids blocking the caller and trading per-connection data between
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* caches per message.
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*/
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if (!acquire_in_xmit(cp)) {
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rds_stats_inc(s_send_lock_contention);
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ret = -ENOMEM;
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goto out;
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}
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/*
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* we record the send generation after doing the xmit acquire.
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* if someone else manages to jump in and do some work, we'll use
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* this to avoid a goto restart farther down.
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*
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* The acquire_in_xmit() check above ensures that only one
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* caller can increment c_send_gen at any time.
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*/
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cp->cp_send_gen++;
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send_gen = cp->cp_send_gen;
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/*
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* rds_conn_shutdown() sets the conn state and then tests RDS_IN_XMIT,
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* we do the opposite to avoid races.
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*/
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if (!rds_conn_path_up(cp)) {
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release_in_xmit(cp);
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ret = 0;
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goto out;
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}
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if (conn->c_trans->xmit_path_prepare)
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conn->c_trans->xmit_path_prepare(cp);
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/*
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* spin trying to push headers and data down the connection until
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* the connection doesn't make forward progress.
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*/
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while (1) {
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rm = cp->cp_xmit_rm;
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/*
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* If between sending messages, we can send a pending congestion
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* map update.
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*/
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if (!rm && test_and_clear_bit(0, &conn->c_map_queued)) {
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rm = rds_cong_update_alloc(conn);
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if (IS_ERR(rm)) {
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ret = PTR_ERR(rm);
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break;
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}
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rm->data.op_active = 1;
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rm->m_inc.i_conn_path = cp;
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rm->m_inc.i_conn = cp->cp_conn;
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cp->cp_xmit_rm = rm;
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}
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/*
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* If not already working on one, grab the next message.
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*
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* cp_xmit_rm holds a ref while we're sending this message down
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* the connction. We can use this ref while holding the
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* send_sem.. rds_send_reset() is serialized with it.
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*/
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if (!rm) {
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unsigned int len;
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batch_count++;
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/* we want to process as big a batch as we can, but
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* we also want to avoid softlockups. If we've been
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* through a lot of messages, lets back off and see
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* if anyone else jumps in
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*/
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if (batch_count >= send_batch_count)
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goto over_batch;
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spin_lock_irqsave(&cp->cp_lock, flags);
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if (!list_empty(&cp->cp_send_queue)) {
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rm = list_entry(cp->cp_send_queue.next,
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struct rds_message,
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m_conn_item);
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rds_message_addref(rm);
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/*
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* Move the message from the send queue to the retransmit
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* list right away.
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*/
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list_move_tail(&rm->m_conn_item,
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&cp->cp_retrans);
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}
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spin_unlock_irqrestore(&cp->cp_lock, flags);
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if (!rm)
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break;
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/* Unfortunately, the way Infiniband deals with
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* RDMA to a bad MR key is by moving the entire
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* queue pair to error state. We cold possibly
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* recover from that, but right now we drop the
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* connection.
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* Therefore, we never retransmit messages with RDMA ops.
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*/
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if (rm->rdma.op_active &&
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test_bit(RDS_MSG_RETRANSMITTED, &rm->m_flags)) {
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spin_lock_irqsave(&cp->cp_lock, flags);
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if (test_and_clear_bit(RDS_MSG_ON_CONN, &rm->m_flags))
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list_move(&rm->m_conn_item, &to_be_dropped);
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spin_unlock_irqrestore(&cp->cp_lock, flags);
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continue;
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}
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/* Require an ACK every once in a while */
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len = ntohl(rm->m_inc.i_hdr.h_len);
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if (cp->cp_unacked_packets == 0 ||
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cp->cp_unacked_bytes < len) {
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__set_bit(RDS_MSG_ACK_REQUIRED, &rm->m_flags);
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cp->cp_unacked_packets =
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rds_sysctl_max_unacked_packets;
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cp->cp_unacked_bytes =
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rds_sysctl_max_unacked_bytes;
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rds_stats_inc(s_send_ack_required);
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} else {
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cp->cp_unacked_bytes -= len;
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cp->cp_unacked_packets--;
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}
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cp->cp_xmit_rm = rm;
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}
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/* The transport either sends the whole rdma or none of it */
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if (rm->rdma.op_active && !cp->cp_xmit_rdma_sent) {
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rm->m_final_op = &rm->rdma;
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/* The transport owns the mapped memory for now.
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* You can't unmap it while it's on the send queue
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*/
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set_bit(RDS_MSG_MAPPED, &rm->m_flags);
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ret = conn->c_trans->xmit_rdma(conn, &rm->rdma);
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if (ret) {
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clear_bit(RDS_MSG_MAPPED, &rm->m_flags);
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wake_up_interruptible(&rm->m_flush_wait);
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break;
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}
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cp->cp_xmit_rdma_sent = 1;
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}
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if (rm->atomic.op_active && !cp->cp_xmit_atomic_sent) {
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rm->m_final_op = &rm->atomic;
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/* The transport owns the mapped memory for now.
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* You can't unmap it while it's on the send queue
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*/
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set_bit(RDS_MSG_MAPPED, &rm->m_flags);
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ret = conn->c_trans->xmit_atomic(conn, &rm->atomic);
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if (ret) {
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clear_bit(RDS_MSG_MAPPED, &rm->m_flags);
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wake_up_interruptible(&rm->m_flush_wait);
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break;
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}
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cp->cp_xmit_atomic_sent = 1;
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}
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/*
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* A number of cases require an RDS header to be sent
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* even if there is no data.
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* We permit 0-byte sends; rds-ping depends on this.
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* However, if there are exclusively attached silent ops,
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* we skip the hdr/data send, to enable silent operation.
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*/
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if (rm->data.op_nents == 0) {
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int ops_present;
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int all_ops_are_silent = 1;
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ops_present = (rm->atomic.op_active || rm->rdma.op_active);
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if (rm->atomic.op_active && !rm->atomic.op_silent)
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all_ops_are_silent = 0;
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if (rm->rdma.op_active && !rm->rdma.op_silent)
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all_ops_are_silent = 0;
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if (ops_present && all_ops_are_silent
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&& !rm->m_rdma_cookie)
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rm->data.op_active = 0;
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}
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if (rm->data.op_active && !cp->cp_xmit_data_sent) {
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rm->m_final_op = &rm->data;
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ret = conn->c_trans->xmit(conn, rm,
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cp->cp_xmit_hdr_off,
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cp->cp_xmit_sg,
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cp->cp_xmit_data_off);
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if (ret <= 0)
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break;
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if (cp->cp_xmit_hdr_off < sizeof(struct rds_header)) {
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tmp = min_t(int, ret,
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sizeof(struct rds_header) -
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cp->cp_xmit_hdr_off);
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cp->cp_xmit_hdr_off += tmp;
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ret -= tmp;
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}
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sg = &rm->data.op_sg[cp->cp_xmit_sg];
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while (ret) {
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tmp = min_t(int, ret, sg->length -
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cp->cp_xmit_data_off);
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cp->cp_xmit_data_off += tmp;
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ret -= tmp;
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if (cp->cp_xmit_data_off == sg->length) {
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cp->cp_xmit_data_off = 0;
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sg++;
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cp->cp_xmit_sg++;
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BUG_ON(ret != 0 && cp->cp_xmit_sg ==
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rm->data.op_nents);
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}
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}
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if (cp->cp_xmit_hdr_off == sizeof(struct rds_header) &&
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(cp->cp_xmit_sg == rm->data.op_nents))
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cp->cp_xmit_data_sent = 1;
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}
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/*
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* A rm will only take multiple times through this loop
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* if there is a data op. Thus, if the data is sent (or there was
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* none), then we're done with the rm.
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*/
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if (!rm->data.op_active || cp->cp_xmit_data_sent) {
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cp->cp_xmit_rm = NULL;
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cp->cp_xmit_sg = 0;
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cp->cp_xmit_hdr_off = 0;
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cp->cp_xmit_data_off = 0;
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cp->cp_xmit_rdma_sent = 0;
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cp->cp_xmit_atomic_sent = 0;
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cp->cp_xmit_data_sent = 0;
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rds_message_put(rm);
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}
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}
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over_batch:
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if (conn->c_trans->xmit_path_complete)
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conn->c_trans->xmit_path_complete(cp);
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release_in_xmit(cp);
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/* Nuke any messages we decided not to retransmit. */
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if (!list_empty(&to_be_dropped)) {
|
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/* irqs on here, so we can put(), unlike above */
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list_for_each_entry(rm, &to_be_dropped, m_conn_item)
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rds_message_put(rm);
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rds_send_remove_from_sock(&to_be_dropped, RDS_RDMA_DROPPED);
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}
|
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|
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/*
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* Other senders can queue a message after we last test the send queue
|
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* but before we clear RDS_IN_XMIT. In that case they'd back off and
|
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* not try and send their newly queued message. We need to check the
|
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* send queue after having cleared RDS_IN_XMIT so that their message
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* doesn't get stuck on the send queue.
|
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*
|
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* If the transport cannot continue (i.e ret != 0), then it must
|
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* call us when more room is available, such as from the tx
|
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* completion handler.
|
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*
|
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* We have an extra generation check here so that if someone manages
|
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* to jump in after our release_in_xmit, we'll see that they have done
|
|
* some work and we will skip our goto
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*/
|
|
if (ret == 0) {
|
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smp_mb();
|
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if ((test_bit(0, &conn->c_map_queued) ||
|
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!list_empty(&cp->cp_send_queue)) &&
|
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send_gen == cp->cp_send_gen) {
|
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rds_stats_inc(s_send_lock_queue_raced);
|
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if (batch_count < send_batch_count)
|
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goto restart;
|
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queue_delayed_work(rds_wq, &cp->cp_send_w, 1);
|
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}
|
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}
|
|
out:
|
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return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rds_send_xmit);
|
|
|
|
static void rds_send_sndbuf_remove(struct rds_sock *rs, struct rds_message *rm)
|
|
{
|
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u32 len = be32_to_cpu(rm->m_inc.i_hdr.h_len);
|
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|
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assert_spin_locked(&rs->rs_lock);
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|
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BUG_ON(rs->rs_snd_bytes < len);
|
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rs->rs_snd_bytes -= len;
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|
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if (rs->rs_snd_bytes == 0)
|
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rds_stats_inc(s_send_queue_empty);
|
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}
|
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|
|
static inline int rds_send_is_acked(struct rds_message *rm, u64 ack,
|
|
is_acked_func is_acked)
|
|
{
|
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if (is_acked)
|
|
return is_acked(rm, ack);
|
|
return be64_to_cpu(rm->m_inc.i_hdr.h_sequence) <= ack;
|
|
}
|
|
|
|
/*
|
|
* This is pretty similar to what happens below in the ACK
|
|
* handling code - except that we call here as soon as we get
|
|
* the IB send completion on the RDMA op and the accompanying
|
|
* message.
|
|
*/
|
|
void rds_rdma_send_complete(struct rds_message *rm, int status)
|
|
{
|
|
struct rds_sock *rs = NULL;
|
|
struct rm_rdma_op *ro;
|
|
struct rds_notifier *notifier;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&rm->m_rs_lock, flags);
|
|
|
|
ro = &rm->rdma;
|
|
if (test_bit(RDS_MSG_ON_SOCK, &rm->m_flags) &&
|
|
ro->op_active && ro->op_notify && ro->op_notifier) {
|
|
notifier = ro->op_notifier;
|
|
rs = rm->m_rs;
|
|
sock_hold(rds_rs_to_sk(rs));
|
|
|
|
notifier->n_status = status;
|
|
spin_lock(&rs->rs_lock);
|
|
list_add_tail(¬ifier->n_list, &rs->rs_notify_queue);
|
|
spin_unlock(&rs->rs_lock);
|
|
|
|
ro->op_notifier = NULL;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&rm->m_rs_lock, flags);
|
|
|
|
if (rs) {
|
|
rds_wake_sk_sleep(rs);
|
|
sock_put(rds_rs_to_sk(rs));
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(rds_rdma_send_complete);
|
|
|
|
/*
|
|
* Just like above, except looks at atomic op
|
|
*/
|
|
void rds_atomic_send_complete(struct rds_message *rm, int status)
|
|
{
|
|
struct rds_sock *rs = NULL;
|
|
struct rm_atomic_op *ao;
|
|
struct rds_notifier *notifier;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&rm->m_rs_lock, flags);
|
|
|
|
ao = &rm->atomic;
|
|
if (test_bit(RDS_MSG_ON_SOCK, &rm->m_flags)
|
|
&& ao->op_active && ao->op_notify && ao->op_notifier) {
|
|
notifier = ao->op_notifier;
|
|
rs = rm->m_rs;
|
|
sock_hold(rds_rs_to_sk(rs));
|
|
|
|
notifier->n_status = status;
|
|
spin_lock(&rs->rs_lock);
|
|
list_add_tail(¬ifier->n_list, &rs->rs_notify_queue);
|
|
spin_unlock(&rs->rs_lock);
|
|
|
|
ao->op_notifier = NULL;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&rm->m_rs_lock, flags);
|
|
|
|
if (rs) {
|
|
rds_wake_sk_sleep(rs);
|
|
sock_put(rds_rs_to_sk(rs));
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(rds_atomic_send_complete);
|
|
|
|
/*
|
|
* This is the same as rds_rdma_send_complete except we
|
|
* don't do any locking - we have all the ingredients (message,
|
|
* socket, socket lock) and can just move the notifier.
|
|
*/
|
|
static inline void
|
|
__rds_send_complete(struct rds_sock *rs, struct rds_message *rm, int status)
|
|
{
|
|
struct rm_rdma_op *ro;
|
|
struct rm_atomic_op *ao;
|
|
|
|
ro = &rm->rdma;
|
|
if (ro->op_active && ro->op_notify && ro->op_notifier) {
|
|
ro->op_notifier->n_status = status;
|
|
list_add_tail(&ro->op_notifier->n_list, &rs->rs_notify_queue);
|
|
ro->op_notifier = NULL;
|
|
}
|
|
|
|
ao = &rm->atomic;
|
|
if (ao->op_active && ao->op_notify && ao->op_notifier) {
|
|
ao->op_notifier->n_status = status;
|
|
list_add_tail(&ao->op_notifier->n_list, &rs->rs_notify_queue);
|
|
ao->op_notifier = NULL;
|
|
}
|
|
|
|
/* No need to wake the app - caller does this */
|
|
}
|
|
|
|
/*
|
|
* This removes messages from the socket's list if they're on it. The list
|
|
* argument must be private to the caller, we must be able to modify it
|
|
* without locks. The messages must have a reference held for their
|
|
* position on the list. This function will drop that reference after
|
|
* removing the messages from the 'messages' list regardless of if it found
|
|
* the messages on the socket list or not.
|
|
*/
|
|
static void rds_send_remove_from_sock(struct list_head *messages, int status)
|
|
{
|
|
unsigned long flags;
|
|
struct rds_sock *rs = NULL;
|
|
struct rds_message *rm;
|
|
|
|
while (!list_empty(messages)) {
|
|
int was_on_sock = 0;
|
|
|
|
rm = list_entry(messages->next, struct rds_message,
|
|
m_conn_item);
|
|
list_del_init(&rm->m_conn_item);
|
|
|
|
/*
|
|
* If we see this flag cleared then we're *sure* that someone
|
|
* else beat us to removing it from the sock. If we race
|
|
* with their flag update we'll get the lock and then really
|
|
* see that the flag has been cleared.
|
|
*
|
|
* The message spinlock makes sure nobody clears rm->m_rs
|
|
* while we're messing with it. It does not prevent the
|
|
* message from being removed from the socket, though.
|
|
*/
|
|
spin_lock_irqsave(&rm->m_rs_lock, flags);
|
|
if (!test_bit(RDS_MSG_ON_SOCK, &rm->m_flags))
|
|
goto unlock_and_drop;
|
|
|
|
if (rs != rm->m_rs) {
|
|
if (rs) {
|
|
rds_wake_sk_sleep(rs);
|
|
sock_put(rds_rs_to_sk(rs));
|
|
}
|
|
rs = rm->m_rs;
|
|
if (rs)
|
|
sock_hold(rds_rs_to_sk(rs));
|
|
}
|
|
if (!rs)
|
|
goto unlock_and_drop;
|
|
spin_lock(&rs->rs_lock);
|
|
|
|
if (test_and_clear_bit(RDS_MSG_ON_SOCK, &rm->m_flags)) {
|
|
struct rm_rdma_op *ro = &rm->rdma;
|
|
struct rds_notifier *notifier;
|
|
|
|
list_del_init(&rm->m_sock_item);
|
|
rds_send_sndbuf_remove(rs, rm);
|
|
|
|
if (ro->op_active && ro->op_notifier &&
|
|
(ro->op_notify || (ro->op_recverr && status))) {
|
|
notifier = ro->op_notifier;
|
|
list_add_tail(¬ifier->n_list,
|
|
&rs->rs_notify_queue);
|
|
if (!notifier->n_status)
|
|
notifier->n_status = status;
|
|
rm->rdma.op_notifier = NULL;
|
|
}
|
|
was_on_sock = 1;
|
|
rm->m_rs = NULL;
|
|
}
|
|
spin_unlock(&rs->rs_lock);
|
|
|
|
unlock_and_drop:
|
|
spin_unlock_irqrestore(&rm->m_rs_lock, flags);
|
|
rds_message_put(rm);
|
|
if (was_on_sock)
|
|
rds_message_put(rm);
|
|
}
|
|
|
|
if (rs) {
|
|
rds_wake_sk_sleep(rs);
|
|
sock_put(rds_rs_to_sk(rs));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Transports call here when they've determined that the receiver queued
|
|
* messages up to, and including, the given sequence number. Messages are
|
|
* moved to the retrans queue when rds_send_xmit picks them off the send
|
|
* queue. This means that in the TCP case, the message may not have been
|
|
* assigned the m_ack_seq yet - but that's fine as long as tcp_is_acked
|
|
* checks the RDS_MSG_HAS_ACK_SEQ bit.
|
|
*/
|
|
void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack,
|
|
is_acked_func is_acked)
|
|
{
|
|
struct rds_message *rm, *tmp;
|
|
unsigned long flags;
|
|
LIST_HEAD(list);
|
|
|
|
spin_lock_irqsave(&cp->cp_lock, flags);
|
|
|
|
list_for_each_entry_safe(rm, tmp, &cp->cp_retrans, m_conn_item) {
|
|
if (!rds_send_is_acked(rm, ack, is_acked))
|
|
break;
|
|
|
|
list_move(&rm->m_conn_item, &list);
|
|
clear_bit(RDS_MSG_ON_CONN, &rm->m_flags);
|
|
}
|
|
|
|
/* order flag updates with spin locks */
|
|
if (!list_empty(&list))
|
|
smp_mb__after_atomic();
|
|
|
|
spin_unlock_irqrestore(&cp->cp_lock, flags);
|
|
|
|
/* now remove the messages from the sock list as needed */
|
|
rds_send_remove_from_sock(&list, RDS_RDMA_SUCCESS);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rds_send_path_drop_acked);
|
|
|
|
void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
|
|
is_acked_func is_acked)
|
|
{
|
|
WARN_ON(conn->c_trans->t_mp_capable);
|
|
rds_send_path_drop_acked(&conn->c_path[0], ack, is_acked);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rds_send_drop_acked);
|
|
|
|
void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest)
|
|
{
|
|
struct rds_message *rm, *tmp;
|
|
struct rds_connection *conn;
|
|
struct rds_conn_path *cp;
|
|
unsigned long flags;
|
|
LIST_HEAD(list);
|
|
|
|
/* get all the messages we're dropping under the rs lock */
|
|
spin_lock_irqsave(&rs->rs_lock, flags);
|
|
|
|
list_for_each_entry_safe(rm, tmp, &rs->rs_send_queue, m_sock_item) {
|
|
if (dest && (dest->sin_addr.s_addr != rm->m_daddr ||
|
|
dest->sin_port != rm->m_inc.i_hdr.h_dport))
|
|
continue;
|
|
|
|
list_move(&rm->m_sock_item, &list);
|
|
rds_send_sndbuf_remove(rs, rm);
|
|
clear_bit(RDS_MSG_ON_SOCK, &rm->m_flags);
|
|
}
|
|
|
|
/* order flag updates with the rs lock */
|
|
smp_mb__after_atomic();
|
|
|
|
spin_unlock_irqrestore(&rs->rs_lock, flags);
|
|
|
|
if (list_empty(&list))
|
|
return;
|
|
|
|
/* Remove the messages from the conn */
|
|
list_for_each_entry(rm, &list, m_sock_item) {
|
|
|
|
conn = rm->m_inc.i_conn;
|
|
if (conn->c_trans->t_mp_capable)
|
|
cp = rm->m_inc.i_conn_path;
|
|
else
|
|
cp = &conn->c_path[0];
|
|
|
|
spin_lock_irqsave(&cp->cp_lock, flags);
|
|
/*
|
|
* Maybe someone else beat us to removing rm from the conn.
|
|
* If we race with their flag update we'll get the lock and
|
|
* then really see that the flag has been cleared.
|
|
*/
|
|
if (!test_and_clear_bit(RDS_MSG_ON_CONN, &rm->m_flags)) {
|
|
spin_unlock_irqrestore(&cp->cp_lock, flags);
|
|
spin_lock_irqsave(&rm->m_rs_lock, flags);
|
|
rm->m_rs = NULL;
|
|
spin_unlock_irqrestore(&rm->m_rs_lock, flags);
|
|
continue;
|
|
}
|
|
list_del_init(&rm->m_conn_item);
|
|
spin_unlock_irqrestore(&cp->cp_lock, flags);
|
|
|
|
/*
|
|
* Couldn't grab m_rs_lock in top loop (lock ordering),
|
|
* but we can now.
|
|
*/
|
|
spin_lock_irqsave(&rm->m_rs_lock, flags);
|
|
|
|
spin_lock(&rs->rs_lock);
|
|
__rds_send_complete(rs, rm, RDS_RDMA_CANCELED);
|
|
spin_unlock(&rs->rs_lock);
|
|
|
|
rm->m_rs = NULL;
|
|
spin_unlock_irqrestore(&rm->m_rs_lock, flags);
|
|
|
|
rds_message_put(rm);
|
|
}
|
|
|
|
rds_wake_sk_sleep(rs);
|
|
|
|
while (!list_empty(&list)) {
|
|
rm = list_entry(list.next, struct rds_message, m_sock_item);
|
|
list_del_init(&rm->m_sock_item);
|
|
rds_message_wait(rm);
|
|
|
|
/* just in case the code above skipped this message
|
|
* because RDS_MSG_ON_CONN wasn't set, run it again here
|
|
* taking m_rs_lock is the only thing that keeps us
|
|
* from racing with ack processing.
|
|
*/
|
|
spin_lock_irqsave(&rm->m_rs_lock, flags);
|
|
|
|
spin_lock(&rs->rs_lock);
|
|
__rds_send_complete(rs, rm, RDS_RDMA_CANCELED);
|
|
spin_unlock(&rs->rs_lock);
|
|
|
|
rm->m_rs = NULL;
|
|
spin_unlock_irqrestore(&rm->m_rs_lock, flags);
|
|
|
|
rds_message_put(rm);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* we only want this to fire once so we use the callers 'queued'. It's
|
|
* possible that another thread can race with us and remove the
|
|
* message from the flow with RDS_CANCEL_SENT_TO.
|
|
*/
|
|
static int rds_send_queue_rm(struct rds_sock *rs, struct rds_connection *conn,
|
|
struct rds_conn_path *cp,
|
|
struct rds_message *rm, __be16 sport,
|
|
__be16 dport, int *queued)
|
|
{
|
|
unsigned long flags;
|
|
u32 len;
|
|
|
|
if (*queued)
|
|
goto out;
|
|
|
|
len = be32_to_cpu(rm->m_inc.i_hdr.h_len);
|
|
|
|
/* this is the only place which holds both the socket's rs_lock
|
|
* and the connection's c_lock */
|
|
spin_lock_irqsave(&rs->rs_lock, flags);
|
|
|
|
/*
|
|
* If there is a little space in sndbuf, we don't queue anything,
|
|
* and userspace gets -EAGAIN. But poll() indicates there's send
|
|
* room. This can lead to bad behavior (spinning) if snd_bytes isn't
|
|
* freed up by incoming acks. So we check the *old* value of
|
|
* rs_snd_bytes here to allow the last msg to exceed the buffer,
|
|
* and poll() now knows no more data can be sent.
|
|
*/
|
|
if (rs->rs_snd_bytes < rds_sk_sndbuf(rs)) {
|
|
rs->rs_snd_bytes += len;
|
|
|
|
/* let recv side know we are close to send space exhaustion.
|
|
* This is probably not the optimal way to do it, as this
|
|
* means we set the flag on *all* messages as soon as our
|
|
* throughput hits a certain threshold.
|
|
*/
|
|
if (rs->rs_snd_bytes >= rds_sk_sndbuf(rs) / 2)
|
|
__set_bit(RDS_MSG_ACK_REQUIRED, &rm->m_flags);
|
|
|
|
list_add_tail(&rm->m_sock_item, &rs->rs_send_queue);
|
|
set_bit(RDS_MSG_ON_SOCK, &rm->m_flags);
|
|
rds_message_addref(rm);
|
|
rm->m_rs = rs;
|
|
|
|
/* The code ordering is a little weird, but we're
|
|
trying to minimize the time we hold c_lock */
|
|
rds_message_populate_header(&rm->m_inc.i_hdr, sport, dport, 0);
|
|
rm->m_inc.i_conn = conn;
|
|
rm->m_inc.i_conn_path = cp;
|
|
rds_message_addref(rm);
|
|
|
|
spin_lock(&cp->cp_lock);
|
|
rm->m_inc.i_hdr.h_sequence = cpu_to_be64(cp->cp_next_tx_seq++);
|
|
list_add_tail(&rm->m_conn_item, &cp->cp_send_queue);
|
|
set_bit(RDS_MSG_ON_CONN, &rm->m_flags);
|
|
spin_unlock(&cp->cp_lock);
|
|
|
|
rdsdebug("queued msg %p len %d, rs %p bytes %d seq %llu\n",
|
|
rm, len, rs, rs->rs_snd_bytes,
|
|
(unsigned long long)be64_to_cpu(rm->m_inc.i_hdr.h_sequence));
|
|
|
|
*queued = 1;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&rs->rs_lock, flags);
|
|
out:
|
|
return *queued;
|
|
}
|
|
|
|
/*
|
|
* rds_message is getting to be quite complicated, and we'd like to allocate
|
|
* it all in one go. This figures out how big it needs to be up front.
|
|
*/
|
|
static int rds_rm_size(struct msghdr *msg, int data_len)
|
|
{
|
|
struct cmsghdr *cmsg;
|
|
int size = 0;
|
|
int cmsg_groups = 0;
|
|
int retval;
|
|
|
|
for_each_cmsghdr(cmsg, msg) {
|
|
if (!CMSG_OK(msg, cmsg))
|
|
return -EINVAL;
|
|
|
|
if (cmsg->cmsg_level != SOL_RDS)
|
|
continue;
|
|
|
|
switch (cmsg->cmsg_type) {
|
|
case RDS_CMSG_RDMA_ARGS:
|
|
cmsg_groups |= 1;
|
|
retval = rds_rdma_extra_size(CMSG_DATA(cmsg));
|
|
if (retval < 0)
|
|
return retval;
|
|
size += retval;
|
|
|
|
break;
|
|
|
|
case RDS_CMSG_RDMA_DEST:
|
|
case RDS_CMSG_RDMA_MAP:
|
|
cmsg_groups |= 2;
|
|
/* these are valid but do no add any size */
|
|
break;
|
|
|
|
case RDS_CMSG_ATOMIC_CSWP:
|
|
case RDS_CMSG_ATOMIC_FADD:
|
|
case RDS_CMSG_MASKED_ATOMIC_CSWP:
|
|
case RDS_CMSG_MASKED_ATOMIC_FADD:
|
|
cmsg_groups |= 1;
|
|
size += sizeof(struct scatterlist);
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
}
|
|
|
|
size += ceil(data_len, PAGE_SIZE) * sizeof(struct scatterlist);
|
|
|
|
/* Ensure (DEST, MAP) are never used with (ARGS, ATOMIC) */
|
|
if (cmsg_groups == 3)
|
|
return -EINVAL;
|
|
|
|
return size;
|
|
}
|
|
|
|
static int rds_cmsg_send(struct rds_sock *rs, struct rds_message *rm,
|
|
struct msghdr *msg, int *allocated_mr)
|
|
{
|
|
struct cmsghdr *cmsg;
|
|
int ret = 0;
|
|
|
|
for_each_cmsghdr(cmsg, msg) {
|
|
if (!CMSG_OK(msg, cmsg))
|
|
return -EINVAL;
|
|
|
|
if (cmsg->cmsg_level != SOL_RDS)
|
|
continue;
|
|
|
|
/* As a side effect, RDMA_DEST and RDMA_MAP will set
|
|
* rm->rdma.m_rdma_cookie and rm->rdma.m_rdma_mr.
|
|
*/
|
|
switch (cmsg->cmsg_type) {
|
|
case RDS_CMSG_RDMA_ARGS:
|
|
ret = rds_cmsg_rdma_args(rs, rm, cmsg);
|
|
break;
|
|
|
|
case RDS_CMSG_RDMA_DEST:
|
|
ret = rds_cmsg_rdma_dest(rs, rm, cmsg);
|
|
break;
|
|
|
|
case RDS_CMSG_RDMA_MAP:
|
|
ret = rds_cmsg_rdma_map(rs, rm, cmsg);
|
|
if (!ret)
|
|
*allocated_mr = 1;
|
|
break;
|
|
case RDS_CMSG_ATOMIC_CSWP:
|
|
case RDS_CMSG_ATOMIC_FADD:
|
|
case RDS_CMSG_MASKED_ATOMIC_CSWP:
|
|
case RDS_CMSG_MASKED_ATOMIC_FADD:
|
|
ret = rds_cmsg_atomic(rs, rm, cmsg);
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct rds_sock *rs = rds_sk_to_rs(sk);
|
|
DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
|
|
__be32 daddr;
|
|
__be16 dport;
|
|
struct rds_message *rm = NULL;
|
|
struct rds_connection *conn;
|
|
int ret = 0;
|
|
int queued = 0, allocated_mr = 0;
|
|
int nonblock = msg->msg_flags & MSG_DONTWAIT;
|
|
long timeo = sock_sndtimeo(sk, nonblock);
|
|
struct rds_conn_path *cpath;
|
|
|
|
/* Mirror Linux UDP mirror of BSD error message compatibility */
|
|
/* XXX: Perhaps MSG_MORE someday */
|
|
if (msg->msg_flags & ~(MSG_DONTWAIT | MSG_CMSG_COMPAT)) {
|
|
ret = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
if (msg->msg_namelen) {
|
|
/* XXX fail non-unicast destination IPs? */
|
|
if (msg->msg_namelen < sizeof(*usin) || usin->sin_family != AF_INET) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
daddr = usin->sin_addr.s_addr;
|
|
dport = usin->sin_port;
|
|
} else {
|
|
/* We only care about consistency with ->connect() */
|
|
lock_sock(sk);
|
|
daddr = rs->rs_conn_addr;
|
|
dport = rs->rs_conn_port;
|
|
release_sock(sk);
|
|
}
|
|
|
|
lock_sock(sk);
|
|
if (daddr == 0 || rs->rs_bound_addr == 0) {
|
|
release_sock(sk);
|
|
ret = -ENOTCONN; /* XXX not a great errno */
|
|
goto out;
|
|
}
|
|
release_sock(sk);
|
|
|
|
if (payload_len > rds_sk_sndbuf(rs)) {
|
|
ret = -EMSGSIZE;
|
|
goto out;
|
|
}
|
|
|
|
/* size of rm including all sgs */
|
|
ret = rds_rm_size(msg, payload_len);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
rm = rds_message_alloc(ret, GFP_KERNEL);
|
|
if (!rm) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* Attach data to the rm */
|
|
if (payload_len) {
|
|
rm->data.op_sg = rds_message_alloc_sgs(rm, ceil(payload_len, PAGE_SIZE));
|
|
if (!rm->data.op_sg) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
ret = rds_message_copy_from_user(rm, &msg->msg_iter);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
rm->data.op_active = 1;
|
|
|
|
rm->m_daddr = daddr;
|
|
|
|
/* rds_conn_create has a spinlock that runs with IRQ off.
|
|
* Caching the conn in the socket helps a lot. */
|
|
if (rs->rs_conn && rs->rs_conn->c_faddr == daddr)
|
|
conn = rs->rs_conn;
|
|
else {
|
|
conn = rds_conn_create_outgoing(sock_net(sock->sk),
|
|
rs->rs_bound_addr, daddr,
|
|
rs->rs_transport,
|
|
sock->sk->sk_allocation);
|
|
if (IS_ERR(conn)) {
|
|
ret = PTR_ERR(conn);
|
|
goto out;
|
|
}
|
|
rs->rs_conn = conn;
|
|
}
|
|
|
|
/* Parse any control messages the user may have included. */
|
|
ret = rds_cmsg_send(rs, rm, msg, &allocated_mr);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (rm->rdma.op_active && !conn->c_trans->xmit_rdma) {
|
|
printk_ratelimited(KERN_NOTICE "rdma_op %p conn xmit_rdma %p\n",
|
|
&rm->rdma, conn->c_trans->xmit_rdma);
|
|
ret = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
if (rm->atomic.op_active && !conn->c_trans->xmit_atomic) {
|
|
printk_ratelimited(KERN_NOTICE "atomic_op %p conn xmit_atomic %p\n",
|
|
&rm->atomic, conn->c_trans->xmit_atomic);
|
|
ret = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
cpath = &conn->c_path[0];
|
|
|
|
rds_conn_path_connect_if_down(cpath);
|
|
|
|
ret = rds_cong_wait(conn->c_fcong, dport, nonblock, rs);
|
|
if (ret) {
|
|
rs->rs_seen_congestion = 1;
|
|
goto out;
|
|
}
|
|
while (!rds_send_queue_rm(rs, conn, cpath, rm, rs->rs_bound_port,
|
|
dport, &queued)) {
|
|
rds_stats_inc(s_send_queue_full);
|
|
|
|
if (nonblock) {
|
|
ret = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
timeo = wait_event_interruptible_timeout(*sk_sleep(sk),
|
|
rds_send_queue_rm(rs, conn, cpath, rm,
|
|
rs->rs_bound_port,
|
|
dport,
|
|
&queued),
|
|
timeo);
|
|
rdsdebug("sendmsg woke queued %d timeo %ld\n", queued, timeo);
|
|
if (timeo > 0 || timeo == MAX_SCHEDULE_TIMEOUT)
|
|
continue;
|
|
|
|
ret = timeo;
|
|
if (ret == 0)
|
|
ret = -ETIMEDOUT;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* By now we've committed to the send. We reuse rds_send_worker()
|
|
* to retry sends in the rds thread if the transport asks us to.
|
|
*/
|
|
rds_stats_inc(s_send_queued);
|
|
|
|
ret = rds_send_xmit(cpath);
|
|
if (ret == -ENOMEM || ret == -EAGAIN)
|
|
queue_delayed_work(rds_wq, &cpath->cp_send_w, 1);
|
|
|
|
rds_message_put(rm);
|
|
return payload_len;
|
|
|
|
out:
|
|
/* If the user included a RDMA_MAP cmsg, we allocated a MR on the fly.
|
|
* If the sendmsg goes through, we keep the MR. If it fails with EAGAIN
|
|
* or in any other way, we need to destroy the MR again */
|
|
if (allocated_mr)
|
|
rds_rdma_unuse(rs, rds_rdma_cookie_key(rm->m_rdma_cookie), 1);
|
|
|
|
if (rm)
|
|
rds_message_put(rm);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Reply to a ping packet.
|
|
*/
|
|
int
|
|
rds_send_pong(struct rds_conn_path *cp, __be16 dport)
|
|
{
|
|
struct rds_message *rm;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
rm = rds_message_alloc(0, GFP_ATOMIC);
|
|
if (!rm) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
rm->m_daddr = cp->cp_conn->c_faddr;
|
|
rm->data.op_active = 1;
|
|
|
|
rds_conn_path_connect_if_down(cp);
|
|
|
|
ret = rds_cong_wait(cp->cp_conn->c_fcong, dport, 1, NULL);
|
|
if (ret)
|
|
goto out;
|
|
|
|
spin_lock_irqsave(&cp->cp_lock, flags);
|
|
list_add_tail(&rm->m_conn_item, &cp->cp_send_queue);
|
|
set_bit(RDS_MSG_ON_CONN, &rm->m_flags);
|
|
rds_message_addref(rm);
|
|
rm->m_inc.i_conn = cp->cp_conn;
|
|
rm->m_inc.i_conn_path = cp;
|
|
|
|
rds_message_populate_header(&rm->m_inc.i_hdr, 0, dport,
|
|
cp->cp_next_tx_seq);
|
|
cp->cp_next_tx_seq++;
|
|
spin_unlock_irqrestore(&cp->cp_lock, flags);
|
|
|
|
rds_stats_inc(s_send_queued);
|
|
rds_stats_inc(s_send_pong);
|
|
|
|
/* schedule the send work on rds_wq */
|
|
queue_delayed_work(rds_wq, &cp->cp_send_w, 1);
|
|
|
|
rds_message_put(rm);
|
|
return 0;
|
|
|
|
out:
|
|
if (rm)
|
|
rds_message_put(rm);
|
|
return ret;
|
|
}
|