![Stefan Raspl](/assets/img/avatar_default.png)
Add support for out of band data send and receive. Signed-off-by: Stefan Raspl <raspl@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
537 lines
16 KiB
C
537 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Manage send buffer.
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* Producer:
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* Copy user space data into send buffer, if send buffer space available.
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* Consumer:
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* Trigger RDMA write into RMBE of peer and send CDC, if RMBE space available.
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#include <linux/net.h>
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#include <linux/rcupdate.h>
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#include <linux/workqueue.h>
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#include <linux/sched/signal.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#include "smc.h"
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#include "smc_wr.h"
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#include "smc_cdc.h"
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#include "smc_tx.h"
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#define SMC_TX_WORK_DELAY HZ
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#define SMC_TX_CORK_DELAY (HZ >> 2) /* 250 ms */
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/***************************** sndbuf producer *******************************/
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/* callback implementation for sk.sk_write_space()
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* to wakeup sndbuf producers that blocked with smc_tx_wait().
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* called under sk_socket lock.
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*/
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static void smc_tx_write_space(struct sock *sk)
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{
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struct socket *sock = sk->sk_socket;
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struct smc_sock *smc = smc_sk(sk);
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struct socket_wq *wq;
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/* similar to sk_stream_write_space */
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if (atomic_read(&smc->conn.sndbuf_space) && sock) {
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clear_bit(SOCK_NOSPACE, &sock->flags);
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rcu_read_lock();
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wq = rcu_dereference(sk->sk_wq);
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if (skwq_has_sleeper(wq))
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wake_up_interruptible_poll(&wq->wait,
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EPOLLOUT | EPOLLWRNORM |
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EPOLLWRBAND);
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if (wq && wq->fasync_list && !(sk->sk_shutdown & SEND_SHUTDOWN))
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sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
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rcu_read_unlock();
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}
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}
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/* Wakeup sndbuf producers that blocked with smc_tx_wait().
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* Cf. tcp_data_snd_check()=>tcp_check_space()=>tcp_new_space().
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*/
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void smc_tx_sndbuf_nonfull(struct smc_sock *smc)
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{
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if (smc->sk.sk_socket &&
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test_bit(SOCK_NOSPACE, &smc->sk.sk_socket->flags))
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smc->sk.sk_write_space(&smc->sk);
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}
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/* blocks sndbuf producer until at least one byte of free space available
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* or urgent Byte was consumed
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*/
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static int smc_tx_wait(struct smc_sock *smc, int flags)
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{
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DEFINE_WAIT_FUNC(wait, woken_wake_function);
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struct smc_connection *conn = &smc->conn;
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struct sock *sk = &smc->sk;
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bool noblock;
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long timeo;
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int rc = 0;
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/* similar to sk_stream_wait_memory */
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timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
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noblock = timeo ? false : true;
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add_wait_queue(sk_sleep(sk), &wait);
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while (1) {
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sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
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if (sk->sk_err ||
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(sk->sk_shutdown & SEND_SHUTDOWN) ||
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conn->local_tx_ctrl.conn_state_flags.peer_done_writing) {
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rc = -EPIPE;
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break;
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}
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if (smc_cdc_rxed_any_close(conn)) {
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rc = -ECONNRESET;
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break;
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}
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if (!timeo) {
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if (noblock)
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set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
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rc = -EAGAIN;
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break;
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}
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if (signal_pending(current)) {
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rc = sock_intr_errno(timeo);
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break;
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}
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sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
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if (atomic_read(&conn->sndbuf_space) && !conn->urg_tx_pend)
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break; /* at least 1 byte of free & no urgent data */
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set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
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sk_wait_event(sk, &timeo,
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sk->sk_err ||
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(sk->sk_shutdown & SEND_SHUTDOWN) ||
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smc_cdc_rxed_any_close(conn) ||
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(atomic_read(&conn->sndbuf_space) &&
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!conn->urg_tx_pend),
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&wait);
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}
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remove_wait_queue(sk_sleep(sk), &wait);
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return rc;
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}
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static bool smc_tx_is_corked(struct smc_sock *smc)
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{
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struct tcp_sock *tp = tcp_sk(smc->clcsock->sk);
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return (tp->nonagle & TCP_NAGLE_CORK) ? true : false;
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}
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/* sndbuf producer: main API called by socket layer.
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* called under sock lock.
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*/
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int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
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{
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size_t copylen, send_done = 0, send_remaining = len;
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size_t chunk_len, chunk_off, chunk_len_sum;
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struct smc_connection *conn = &smc->conn;
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union smc_host_cursor prep;
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struct sock *sk = &smc->sk;
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char *sndbuf_base;
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int tx_cnt_prep;
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int writespace;
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int rc, chunk;
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/* This should be in poll */
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sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
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if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) {
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rc = -EPIPE;
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goto out_err;
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}
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while (msg_data_left(msg)) {
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if (sk->sk_state == SMC_INIT)
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return -ENOTCONN;
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if (smc->sk.sk_shutdown & SEND_SHUTDOWN ||
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(smc->sk.sk_err == ECONNABORTED) ||
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conn->local_tx_ctrl.conn_state_flags.peer_conn_abort)
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return -EPIPE;
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if (smc_cdc_rxed_any_close(conn))
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return send_done ?: -ECONNRESET;
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if (msg->msg_flags & MSG_OOB)
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conn->local_tx_ctrl.prod_flags.urg_data_pending = 1;
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if (!atomic_read(&conn->sndbuf_space) || conn->urg_tx_pend) {
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rc = smc_tx_wait(smc, msg->msg_flags);
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if (rc) {
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if (send_done)
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return send_done;
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goto out_err;
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}
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continue;
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}
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/* initialize variables for 1st iteration of subsequent loop */
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/* could be just 1 byte, even after smc_tx_wait above */
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writespace = atomic_read(&conn->sndbuf_space);
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/* not more than what user space asked for */
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copylen = min_t(size_t, send_remaining, writespace);
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/* determine start of sndbuf */
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sndbuf_base = conn->sndbuf_desc->cpu_addr;
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smc_curs_write(&prep,
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smc_curs_read(&conn->tx_curs_prep, conn),
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conn);
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tx_cnt_prep = prep.count;
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/* determine chunks where to write into sndbuf */
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/* either unwrapped case, or 1st chunk of wrapped case */
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chunk_len = min_t(size_t, copylen, conn->sndbuf_desc->len -
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tx_cnt_prep);
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chunk_len_sum = chunk_len;
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chunk_off = tx_cnt_prep;
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smc_sndbuf_sync_sg_for_cpu(conn);
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for (chunk = 0; chunk < 2; chunk++) {
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rc = memcpy_from_msg(sndbuf_base + chunk_off,
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msg, chunk_len);
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if (rc) {
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smc_sndbuf_sync_sg_for_device(conn);
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if (send_done)
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return send_done;
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goto out_err;
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}
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send_done += chunk_len;
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send_remaining -= chunk_len;
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if (chunk_len_sum == copylen)
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break; /* either on 1st or 2nd iteration */
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/* prepare next (== 2nd) iteration */
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chunk_len = copylen - chunk_len; /* remainder */
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chunk_len_sum += chunk_len;
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chunk_off = 0; /* modulo offset in send ring buffer */
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}
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smc_sndbuf_sync_sg_for_device(conn);
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/* update cursors */
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smc_curs_add(conn->sndbuf_desc->len, &prep, copylen);
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smc_curs_write(&conn->tx_curs_prep,
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smc_curs_read(&prep, conn),
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conn);
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/* increased in send tasklet smc_cdc_tx_handler() */
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smp_mb__before_atomic();
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atomic_sub(copylen, &conn->sndbuf_space);
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/* guarantee 0 <= sndbuf_space <= sndbuf_desc->len */
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smp_mb__after_atomic();
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/* since we just produced more new data into sndbuf,
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* trigger sndbuf consumer: RDMA write into peer RMBE and CDC
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*/
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if ((msg->msg_flags & MSG_OOB) && !send_remaining)
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conn->urg_tx_pend = true;
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if ((msg->msg_flags & MSG_MORE || smc_tx_is_corked(smc)) &&
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(atomic_read(&conn->sndbuf_space) >
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(conn->sndbuf_desc->len >> 1)))
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/* for a corked socket defer the RDMA writes if there
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* is still sufficient sndbuf_space available
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*/
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schedule_delayed_work(&conn->tx_work,
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SMC_TX_CORK_DELAY);
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else
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smc_tx_sndbuf_nonempty(conn);
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} /* while (msg_data_left(msg)) */
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return send_done;
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out_err:
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rc = sk_stream_error(sk, msg->msg_flags, rc);
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/* make sure we wake any epoll edge trigger waiter */
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if (unlikely(rc == -EAGAIN))
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sk->sk_write_space(sk);
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return rc;
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}
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/***************************** sndbuf consumer *******************************/
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/* sndbuf consumer: actual data transfer of one target chunk with RDMA write */
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static int smc_tx_rdma_write(struct smc_connection *conn, int peer_rmbe_offset,
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int num_sges, struct ib_sge sges[])
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{
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struct smc_link_group *lgr = conn->lgr;
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struct ib_send_wr *failed_wr = NULL;
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struct ib_rdma_wr rdma_wr;
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struct smc_link *link;
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int rc;
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memset(&rdma_wr, 0, sizeof(rdma_wr));
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link = &lgr->lnk[SMC_SINGLE_LINK];
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rdma_wr.wr.wr_id = smc_wr_tx_get_next_wr_id(link);
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rdma_wr.wr.sg_list = sges;
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rdma_wr.wr.num_sge = num_sges;
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rdma_wr.wr.opcode = IB_WR_RDMA_WRITE;
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rdma_wr.remote_addr =
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lgr->rtokens[conn->rtoken_idx][SMC_SINGLE_LINK].dma_addr +
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/* RMBE within RMB */
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conn->tx_off +
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/* offset within RMBE */
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peer_rmbe_offset;
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rdma_wr.rkey = lgr->rtokens[conn->rtoken_idx][SMC_SINGLE_LINK].rkey;
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rc = ib_post_send(link->roce_qp, &rdma_wr.wr, &failed_wr);
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if (rc) {
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conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
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smc_lgr_terminate(lgr);
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}
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return rc;
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}
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/* sndbuf consumer */
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static inline void smc_tx_advance_cursors(struct smc_connection *conn,
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union smc_host_cursor *prod,
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union smc_host_cursor *sent,
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size_t len)
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{
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smc_curs_add(conn->peer_rmbe_size, prod, len);
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/* increased in recv tasklet smc_cdc_msg_rcv() */
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smp_mb__before_atomic();
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/* data in flight reduces usable snd_wnd */
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atomic_sub(len, &conn->peer_rmbe_space);
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/* guarantee 0 <= peer_rmbe_space <= peer_rmbe_size */
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smp_mb__after_atomic();
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smc_curs_add(conn->sndbuf_desc->len, sent, len);
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}
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/* sndbuf consumer: prepare all necessary (src&dst) chunks of data transmit;
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* usable snd_wnd as max transmit
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*/
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static int smc_tx_rdma_writes(struct smc_connection *conn)
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{
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size_t src_off, src_len, dst_off, dst_len; /* current chunk values */
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size_t len, dst_len_sum, src_len_sum, dstchunk, srcchunk;
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union smc_host_cursor sent, prep, prod, cons;
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struct ib_sge sges[SMC_IB_MAX_SEND_SGE];
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struct smc_link_group *lgr = conn->lgr;
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struct smc_cdc_producer_flags *pflags;
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int to_send, rmbespace;
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struct smc_link *link;
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dma_addr_t dma_addr;
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int num_sges;
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int rc;
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/* source: sndbuf */
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smc_curs_write(&sent, smc_curs_read(&conn->tx_curs_sent, conn), conn);
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smc_curs_write(&prep, smc_curs_read(&conn->tx_curs_prep, conn), conn);
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/* cf. wmem_alloc - (snd_max - snd_una) */
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to_send = smc_curs_diff(conn->sndbuf_desc->len, &sent, &prep);
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if (to_send <= 0)
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return 0;
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/* destination: RMBE */
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/* cf. snd_wnd */
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rmbespace = atomic_read(&conn->peer_rmbe_space);
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if (rmbespace <= 0)
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return 0;
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smc_curs_write(&prod,
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smc_curs_read(&conn->local_tx_ctrl.prod, conn),
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conn);
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smc_curs_write(&cons,
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smc_curs_read(&conn->local_rx_ctrl.cons, conn),
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conn);
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/* if usable snd_wnd closes ask peer to advertise once it opens again */
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pflags = &conn->local_tx_ctrl.prod_flags;
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pflags->write_blocked = (to_send >= rmbespace);
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/* cf. usable snd_wnd */
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len = min(to_send, rmbespace);
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/* initialize variables for first iteration of subsequent nested loop */
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link = &lgr->lnk[SMC_SINGLE_LINK];
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dst_off = prod.count;
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if (prod.wrap == cons.wrap) {
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/* the filled destination area is unwrapped,
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* hence the available free destination space is wrapped
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* and we need 2 destination chunks of sum len; start with 1st
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* which is limited by what's available in sndbuf
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*/
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dst_len = min_t(size_t,
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conn->peer_rmbe_size - prod.count, len);
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} else {
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/* the filled destination area is wrapped,
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* hence the available free destination space is unwrapped
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* and we need a single destination chunk of entire len
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*/
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dst_len = len;
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}
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dst_len_sum = dst_len;
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src_off = sent.count;
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/* dst_len determines the maximum src_len */
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if (sent.count + dst_len <= conn->sndbuf_desc->len) {
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/* unwrapped src case: single chunk of entire dst_len */
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src_len = dst_len;
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} else {
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/* wrapped src case: 2 chunks of sum dst_len; start with 1st: */
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src_len = conn->sndbuf_desc->len - sent.count;
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}
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src_len_sum = src_len;
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dma_addr = sg_dma_address(conn->sndbuf_desc->sgt[SMC_SINGLE_LINK].sgl);
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for (dstchunk = 0; dstchunk < 2; dstchunk++) {
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num_sges = 0;
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for (srcchunk = 0; srcchunk < 2; srcchunk++) {
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sges[srcchunk].addr = dma_addr + src_off;
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sges[srcchunk].length = src_len;
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sges[srcchunk].lkey = link->roce_pd->local_dma_lkey;
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num_sges++;
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src_off += src_len;
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if (src_off >= conn->sndbuf_desc->len)
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src_off -= conn->sndbuf_desc->len;
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/* modulo in send ring */
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if (src_len_sum == dst_len)
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break; /* either on 1st or 2nd iteration */
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/* prepare next (== 2nd) iteration */
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src_len = dst_len - src_len; /* remainder */
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src_len_sum += src_len;
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}
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rc = smc_tx_rdma_write(conn, dst_off, num_sges, sges);
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if (rc)
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return rc;
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if (dst_len_sum == len)
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break; /* either on 1st or 2nd iteration */
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/* prepare next (== 2nd) iteration */
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dst_off = 0; /* modulo offset in RMBE ring buffer */
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dst_len = len - dst_len; /* remainder */
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dst_len_sum += dst_len;
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src_len = min_t(int,
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dst_len, conn->sndbuf_desc->len - sent.count);
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src_len_sum = src_len;
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}
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if (conn->urg_tx_pend && len == to_send)
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pflags->urg_data_present = 1;
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smc_tx_advance_cursors(conn, &prod, &sent, len);
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/* update connection's cursors with advanced local cursors */
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smc_curs_write(&conn->local_tx_ctrl.prod,
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smc_curs_read(&prod, conn),
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conn);
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/* dst: peer RMBE */
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smc_curs_write(&conn->tx_curs_sent,
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smc_curs_read(&sent, conn),
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conn);
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/* src: local sndbuf */
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return 0;
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}
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/* Wakeup sndbuf consumers from any context (IRQ or process)
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* since there is more data to transmit; usable snd_wnd as max transmit
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*/
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int smc_tx_sndbuf_nonempty(struct smc_connection *conn)
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{
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struct smc_cdc_producer_flags *pflags;
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struct smc_cdc_tx_pend *pend;
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struct smc_wr_buf *wr_buf;
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int rc;
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spin_lock_bh(&conn->send_lock);
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rc = smc_cdc_get_free_slot(conn, &wr_buf, &pend);
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if (rc < 0) {
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if (rc == -EBUSY) {
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struct smc_sock *smc =
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container_of(conn, struct smc_sock, conn);
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if (smc->sk.sk_err == ECONNABORTED) {
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rc = sock_error(&smc->sk);
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goto out_unlock;
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}
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rc = 0;
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if (conn->alert_token_local) /* connection healthy */
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mod_delayed_work(system_wq, &conn->tx_work,
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SMC_TX_WORK_DELAY);
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}
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goto out_unlock;
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}
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if (!conn->local_tx_ctrl.prod_flags.urg_data_present) {
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rc = smc_tx_rdma_writes(conn);
|
|
if (rc) {
|
|
smc_wr_tx_put_slot(&conn->lgr->lnk[SMC_SINGLE_LINK],
|
|
(struct smc_wr_tx_pend_priv *)pend);
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
rc = smc_cdc_msg_send(conn, wr_buf, pend);
|
|
pflags = &conn->local_tx_ctrl.prod_flags;
|
|
if (!rc && pflags->urg_data_present) {
|
|
pflags->urg_data_pending = 0;
|
|
pflags->urg_data_present = 0;
|
|
}
|
|
|
|
out_unlock:
|
|
spin_unlock_bh(&conn->send_lock);
|
|
return rc;
|
|
}
|
|
|
|
/* Wakeup sndbuf consumers from process context
|
|
* since there is more data to transmit
|
|
*/
|
|
void smc_tx_work(struct work_struct *work)
|
|
{
|
|
struct smc_connection *conn = container_of(to_delayed_work(work),
|
|
struct smc_connection,
|
|
tx_work);
|
|
struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
|
|
int rc;
|
|
|
|
lock_sock(&smc->sk);
|
|
if (smc->sk.sk_err ||
|
|
!conn->alert_token_local ||
|
|
conn->local_rx_ctrl.conn_state_flags.peer_conn_abort)
|
|
goto out;
|
|
|
|
rc = smc_tx_sndbuf_nonempty(conn);
|
|
if (!rc && conn->local_rx_ctrl.prod_flags.write_blocked &&
|
|
!atomic_read(&conn->bytes_to_rcv))
|
|
conn->local_rx_ctrl.prod_flags.write_blocked = 0;
|
|
|
|
out:
|
|
release_sock(&smc->sk);
|
|
}
|
|
|
|
void smc_tx_consumer_update(struct smc_connection *conn, bool force)
|
|
{
|
|
union smc_host_cursor cfed, cons;
|
|
int to_confirm;
|
|
|
|
smc_curs_write(&cons,
|
|
smc_curs_read(&conn->local_tx_ctrl.cons, conn),
|
|
conn);
|
|
smc_curs_write(&cfed,
|
|
smc_curs_read(&conn->rx_curs_confirmed, conn),
|
|
conn);
|
|
to_confirm = smc_curs_diff(conn->rmb_desc->len, &cfed, &cons);
|
|
|
|
if (conn->local_rx_ctrl.prod_flags.cons_curs_upd_req ||
|
|
force ||
|
|
((to_confirm > conn->rmbe_update_limit) &&
|
|
((to_confirm > (conn->rmb_desc->len / 2)) ||
|
|
conn->local_rx_ctrl.prod_flags.write_blocked))) {
|
|
if ((smc_cdc_get_slot_and_msg_send(conn) < 0) &&
|
|
conn->alert_token_local) { /* connection healthy */
|
|
schedule_delayed_work(&conn->tx_work,
|
|
SMC_TX_WORK_DELAY);
|
|
return;
|
|
}
|
|
smc_curs_write(&conn->rx_curs_confirmed,
|
|
smc_curs_read(&conn->local_tx_ctrl.cons, conn),
|
|
conn);
|
|
conn->local_rx_ctrl.prod_flags.cons_curs_upd_req = 0;
|
|
}
|
|
if (conn->local_rx_ctrl.prod_flags.write_blocked &&
|
|
!atomic_read(&conn->bytes_to_rcv))
|
|
conn->local_rx_ctrl.prod_flags.write_blocked = 0;
|
|
}
|
|
|
|
/***************************** send initialize *******************************/
|
|
|
|
/* Initialize send properties on connection establishment. NB: not __init! */
|
|
void smc_tx_init(struct smc_sock *smc)
|
|
{
|
|
smc->sk.sk_write_space = smc_tx_write_space;
|
|
}
|