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https://github.com/edk2-porting/linux-next.git
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194730a9be
Make the gathered SMC statistics network namespace aware, for each namespace collect an own set of statistic information. Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
453 lines
12 KiB
C
453 lines
12 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 RMBE
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* copy new RMBE data into user space
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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/sched/signal.h>
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#include <net/sock.h>
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#include "smc.h"
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#include "smc_core.h"
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#include "smc_cdc.h"
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#include "smc_tx.h" /* smc_tx_consumer_update() */
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#include "smc_rx.h"
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#include "smc_stats.h"
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/* callback implementation to wakeup consumers blocked with smc_rx_wait().
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* indirectly called by smc_cdc_msg_recv_action().
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*/
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static void smc_rx_wake_up(struct sock *sk)
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{
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struct socket_wq *wq;
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/* derived from sock_def_readable() */
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/* called already in smc_listen_work() */
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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_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
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EPOLLRDNORM | EPOLLRDBAND);
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sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
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if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
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(sk->sk_state == SMC_CLOSED))
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sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_HUP);
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rcu_read_unlock();
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}
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/* Update consumer cursor
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* @conn connection to update
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* @cons consumer cursor
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* @len number of Bytes consumed
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* Returns:
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* 1 if we should end our receive, 0 otherwise
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*/
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static int smc_rx_update_consumer(struct smc_sock *smc,
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union smc_host_cursor cons, size_t len)
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{
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struct smc_connection *conn = &smc->conn;
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struct sock *sk = &smc->sk;
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bool force = false;
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int diff, rc = 0;
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smc_curs_add(conn->rmb_desc->len, &cons, len);
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/* did we process urgent data? */
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if (conn->urg_state == SMC_URG_VALID || conn->urg_rx_skip_pend) {
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diff = smc_curs_comp(conn->rmb_desc->len, &cons,
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&conn->urg_curs);
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if (sock_flag(sk, SOCK_URGINLINE)) {
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if (diff == 0) {
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force = true;
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rc = 1;
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conn->urg_state = SMC_URG_READ;
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}
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} else {
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if (diff == 1) {
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/* skip urgent byte */
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force = true;
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smc_curs_add(conn->rmb_desc->len, &cons, 1);
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conn->urg_rx_skip_pend = false;
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} else if (diff < -1)
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/* we read past urgent byte */
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conn->urg_state = SMC_URG_READ;
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}
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}
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smc_curs_copy(&conn->local_tx_ctrl.cons, &cons, conn);
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/* send consumer cursor update if required */
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/* similar to advertising new TCP rcv_wnd if required */
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smc_tx_consumer_update(conn, force);
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return rc;
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}
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static void smc_rx_update_cons(struct smc_sock *smc, size_t len)
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{
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struct smc_connection *conn = &smc->conn;
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union smc_host_cursor cons;
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smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
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smc_rx_update_consumer(smc, cons, len);
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}
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struct smc_spd_priv {
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struct smc_sock *smc;
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size_t len;
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};
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static void smc_rx_pipe_buf_release(struct pipe_inode_info *pipe,
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struct pipe_buffer *buf)
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{
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struct smc_spd_priv *priv = (struct smc_spd_priv *)buf->private;
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struct smc_sock *smc = priv->smc;
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struct smc_connection *conn;
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struct sock *sk = &smc->sk;
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if (sk->sk_state == SMC_CLOSED ||
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sk->sk_state == SMC_PEERFINCLOSEWAIT ||
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sk->sk_state == SMC_APPFINCLOSEWAIT)
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goto out;
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conn = &smc->conn;
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lock_sock(sk);
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smc_rx_update_cons(smc, priv->len);
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release_sock(sk);
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if (atomic_sub_and_test(priv->len, &conn->splice_pending))
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smc_rx_wake_up(sk);
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out:
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kfree(priv);
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put_page(buf->page);
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sock_put(sk);
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}
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static const struct pipe_buf_operations smc_pipe_ops = {
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.release = smc_rx_pipe_buf_release,
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.get = generic_pipe_buf_get
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};
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static void smc_rx_spd_release(struct splice_pipe_desc *spd,
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unsigned int i)
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{
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put_page(spd->pages[i]);
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}
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static int smc_rx_splice(struct pipe_inode_info *pipe, char *src, size_t len,
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struct smc_sock *smc)
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{
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struct splice_pipe_desc spd;
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struct partial_page partial;
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struct smc_spd_priv *priv;
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int bytes;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->len = len;
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priv->smc = smc;
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partial.offset = src - (char *)smc->conn.rmb_desc->cpu_addr;
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partial.len = len;
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partial.private = (unsigned long)priv;
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spd.nr_pages_max = 1;
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spd.nr_pages = 1;
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spd.pages = &smc->conn.rmb_desc->pages;
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spd.partial = &partial;
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spd.ops = &smc_pipe_ops;
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spd.spd_release = smc_rx_spd_release;
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bytes = splice_to_pipe(pipe, &spd);
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if (bytes > 0) {
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sock_hold(&smc->sk);
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get_page(smc->conn.rmb_desc->pages);
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atomic_add(bytes, &smc->conn.splice_pending);
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}
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return bytes;
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}
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static int smc_rx_data_available_and_no_splice_pend(struct smc_connection *conn)
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{
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return atomic_read(&conn->bytes_to_rcv) &&
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!atomic_read(&conn->splice_pending);
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}
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/* blocks rcvbuf consumer until >=len bytes available or timeout or interrupted
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* @smc smc socket
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* @timeo pointer to max seconds to wait, pointer to value 0 for no timeout
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* @fcrit add'l criterion to evaluate as function pointer
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* Returns:
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* 1 if at least 1 byte available in rcvbuf or if socket error/shutdown.
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* 0 otherwise (nothing in rcvbuf nor timeout, e.g. interrupted).
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*/
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int smc_rx_wait(struct smc_sock *smc, long *timeo,
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int (*fcrit)(struct smc_connection *conn))
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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 smc_cdc_conn_state_flags *cflags =
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&conn->local_tx_ctrl.conn_state_flags;
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struct sock *sk = &smc->sk;
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int rc;
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if (fcrit(conn))
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return 1;
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sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
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add_wait_queue(sk_sleep(sk), &wait);
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rc = sk_wait_event(sk, timeo,
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sk->sk_err ||
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cflags->peer_conn_abort ||
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sk->sk_shutdown & RCV_SHUTDOWN ||
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conn->killed ||
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fcrit(conn),
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&wait);
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remove_wait_queue(sk_sleep(sk), &wait);
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sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
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return rc;
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}
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static int smc_rx_recv_urg(struct smc_sock *smc, struct msghdr *msg, int len,
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int flags)
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{
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struct smc_connection *conn = &smc->conn;
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union smc_host_cursor cons;
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struct sock *sk = &smc->sk;
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int rc = 0;
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if (sock_flag(sk, SOCK_URGINLINE) ||
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!(conn->urg_state == SMC_URG_VALID) ||
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conn->urg_state == SMC_URG_READ)
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return -EINVAL;
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SMC_STAT_INC(smc, urg_data_cnt);
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if (conn->urg_state == SMC_URG_VALID) {
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if (!(flags & MSG_PEEK))
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smc->conn.urg_state = SMC_URG_READ;
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msg->msg_flags |= MSG_OOB;
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if (len > 0) {
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if (!(flags & MSG_TRUNC))
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rc = memcpy_to_msg(msg, &conn->urg_rx_byte, 1);
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len = 1;
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smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
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if (smc_curs_diff(conn->rmb_desc->len, &cons,
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&conn->urg_curs) > 1)
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conn->urg_rx_skip_pend = true;
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/* Urgent Byte was already accounted for, but trigger
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* skipping the urgent byte in non-inline case
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*/
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if (!(flags & MSG_PEEK))
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smc_rx_update_consumer(smc, cons, 0);
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} else {
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msg->msg_flags |= MSG_TRUNC;
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}
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return rc ? -EFAULT : len;
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}
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if (sk->sk_state == SMC_CLOSED || sk->sk_shutdown & RCV_SHUTDOWN)
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return 0;
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return -EAGAIN;
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}
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static bool smc_rx_recvmsg_data_available(struct smc_sock *smc)
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{
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struct smc_connection *conn = &smc->conn;
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if (smc_rx_data_available(conn))
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return true;
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else if (conn->urg_state == SMC_URG_VALID)
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/* we received a single urgent Byte - skip */
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smc_rx_update_cons(smc, 0);
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return false;
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}
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/* smc_rx_recvmsg - receive data from RMBE
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* @msg: copy data to receive buffer
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* @pipe: copy data to pipe if set - indicates splice() call
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*
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* rcvbuf consumer: main API called by socket layer.
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* Called under sk lock.
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*/
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int smc_rx_recvmsg(struct smc_sock *smc, struct msghdr *msg,
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struct pipe_inode_info *pipe, size_t len, int flags)
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{
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size_t copylen, read_done = 0, read_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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int (*func)(struct smc_connection *conn);
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union smc_host_cursor cons;
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int readable, chunk;
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char *rcvbuf_base;
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struct sock *sk;
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int splbytes;
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long timeo;
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int target; /* Read at least these many bytes */
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int rc;
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if (unlikely(flags & MSG_ERRQUEUE))
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return -EINVAL; /* future work for sk.sk_family == AF_SMC */
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sk = &smc->sk;
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if (sk->sk_state == SMC_LISTEN)
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return -ENOTCONN;
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if (flags & MSG_OOB)
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return smc_rx_recv_urg(smc, msg, len, flags);
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timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
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target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
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readable = atomic_read(&conn->bytes_to_rcv);
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if (readable >= conn->rmb_desc->len)
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SMC_STAT_RMB_RX_FULL(smc, !conn->lnk);
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if (len < readable)
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SMC_STAT_RMB_RX_SIZE_SMALL(smc, !conn->lnk);
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/* we currently use 1 RMBE per RMB, so RMBE == RMB base addr */
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rcvbuf_base = conn->rx_off + conn->rmb_desc->cpu_addr;
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do { /* while (read_remaining) */
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if (read_done >= target || (pipe && read_done))
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break;
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if (conn->killed)
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break;
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if (smc_rx_recvmsg_data_available(smc))
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goto copy;
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if (sk->sk_shutdown & RCV_SHUTDOWN) {
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/* smc_cdc_msg_recv_action() could have run after
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* above smc_rx_recvmsg_data_available()
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*/
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if (smc_rx_recvmsg_data_available(smc))
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goto copy;
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break;
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}
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if (read_done) {
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if (sk->sk_err ||
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sk->sk_state == SMC_CLOSED ||
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!timeo ||
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signal_pending(current))
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break;
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} else {
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if (sk->sk_err) {
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read_done = sock_error(sk);
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break;
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}
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if (sk->sk_state == SMC_CLOSED) {
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if (!sock_flag(sk, SOCK_DONE)) {
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/* This occurs when user tries to read
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* from never connected socket.
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*/
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read_done = -ENOTCONN;
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break;
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}
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break;
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}
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if (signal_pending(current)) {
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read_done = sock_intr_errno(timeo);
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break;
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}
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if (!timeo)
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return -EAGAIN;
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}
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if (!smc_rx_data_available(conn)) {
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smc_rx_wait(smc, &timeo, smc_rx_data_available);
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continue;
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}
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copy:
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/* initialize variables for 1st iteration of subsequent loop */
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/* could be just 1 byte, even after waiting on data above */
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readable = atomic_read(&conn->bytes_to_rcv);
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splbytes = atomic_read(&conn->splice_pending);
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if (!readable || (msg && splbytes)) {
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if (splbytes)
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func = smc_rx_data_available_and_no_splice_pend;
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else
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func = smc_rx_data_available;
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smc_rx_wait(smc, &timeo, func);
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continue;
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}
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smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
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/* subsequent splice() calls pick up where previous left */
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if (splbytes)
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smc_curs_add(conn->rmb_desc->len, &cons, splbytes);
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if (conn->urg_state == SMC_URG_VALID &&
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sock_flag(&smc->sk, SOCK_URGINLINE) &&
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readable > 1)
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readable--; /* always stop at urgent Byte */
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/* not more than what user space asked for */
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copylen = min_t(size_t, read_remaining, readable);
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/* determine chunks where to read from rcvbuf */
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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->rmb_desc->len -
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cons.count);
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chunk_len_sum = chunk_len;
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chunk_off = cons.count;
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smc_rmb_sync_sg_for_cpu(conn);
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for (chunk = 0; chunk < 2; chunk++) {
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if (!(flags & MSG_TRUNC)) {
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if (msg) {
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rc = memcpy_to_msg(msg, rcvbuf_base +
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chunk_off,
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chunk_len);
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} else {
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rc = smc_rx_splice(pipe, rcvbuf_base +
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chunk_off, chunk_len,
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smc);
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}
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if (rc < 0) {
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if (!read_done)
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read_done = -EFAULT;
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smc_rmb_sync_sg_for_device(conn);
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goto out;
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}
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}
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read_remaining -= chunk_len;
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read_done += 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 recv ring buffer */
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}
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smc_rmb_sync_sg_for_device(conn);
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/* update cursors */
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if (!(flags & MSG_PEEK)) {
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/* increased in recv tasklet smc_cdc_msg_rcv() */
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smp_mb__before_atomic();
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atomic_sub(copylen, &conn->bytes_to_rcv);
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/* guarantee 0 <= bytes_to_rcv <= rmb_desc->len */
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smp_mb__after_atomic();
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if (msg && smc_rx_update_consumer(smc, cons, copylen))
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goto out;
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}
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} while (read_remaining);
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out:
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return read_done;
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}
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/* Initialize receive properties on connection establishment. NB: not __init! */
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void smc_rx_init(struct smc_sock *smc)
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{
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smc->sk.sk_data_ready = smc_rx_wake_up;
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atomic_set(&smc->conn.splice_pending, 0);
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smc->conn.urg_state = SMC_URG_READ;
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}
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