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net/smc: nonblocking connect rework
For nonblocking sockets move the kernel_connect() from the connect worker into the initial smc_connect part to return kernel_connect() errors other than -EINPROGRESS to user space. Reviewed-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun
David S. Miller
parent
6dc400af21
commit
50717a37db
2 changed files with 46 additions and 41 deletions
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@ -134,11 +134,9 @@ static int smc_release(struct socket *sock)
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smc = smc_sk(sk);
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/* cleanup for a dangling non-blocking connect */
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if (smc->connect_info && sk->sk_state == SMC_INIT)
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if (smc->connect_nonblock && sk->sk_state == SMC_INIT)
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tcp_abort(smc->clcsock->sk, ECONNABORTED);
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flush_work(&smc->connect_work);
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kfree(smc->connect_info);
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smc->connect_info = NULL;
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if (sk->sk_state == SMC_LISTEN)
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/* smc_close_non_accepted() is called and acquires
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@ -452,6 +450,7 @@ static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
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smc->use_fallback = true;
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smc->fallback_rsn = reason_code;
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smc_copy_sock_settings_to_clc(smc);
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smc->connect_nonblock = 0;
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if (smc->sk.sk_state == SMC_INIT)
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smc->sk.sk_state = SMC_ACTIVE;
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return 0;
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@ -491,6 +490,7 @@ static int smc_connect_abort(struct smc_sock *smc, int reason_code,
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mutex_unlock(&smc_client_lgr_pending);
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smc_conn_free(&smc->conn);
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smc->connect_nonblock = 0;
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return reason_code;
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}
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@ -633,6 +633,7 @@ static int smc_connect_rdma(struct smc_sock *smc,
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mutex_unlock(&smc_client_lgr_pending);
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smc_copy_sock_settings_to_clc(smc);
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smc->connect_nonblock = 0;
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if (smc->sk.sk_state == SMC_INIT)
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smc->sk.sk_state = SMC_ACTIVE;
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@ -671,6 +672,7 @@ static int smc_connect_ism(struct smc_sock *smc,
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mutex_unlock(&smc_server_lgr_pending);
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smc_copy_sock_settings_to_clc(smc);
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smc->connect_nonblock = 0;
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if (smc->sk.sk_state == SMC_INIT)
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smc->sk.sk_state = SMC_ACTIVE;
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@ -756,17 +758,30 @@ static void smc_connect_work(struct work_struct *work)
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{
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struct smc_sock *smc = container_of(work, struct smc_sock,
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connect_work);
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int rc;
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long timeo = smc->sk.sk_sndtimeo;
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int rc = 0;
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lock_sock(&smc->sk);
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rc = kernel_connect(smc->clcsock, &smc->connect_info->addr,
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smc->connect_info->alen, smc->connect_info->flags);
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if (!timeo)
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timeo = MAX_SCHEDULE_TIMEOUT;
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lock_sock(smc->clcsock->sk);
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if (smc->clcsock->sk->sk_err) {
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smc->sk.sk_err = smc->clcsock->sk->sk_err;
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goto out;
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} else if ((1 << smc->clcsock->sk->sk_state) &
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(TCPF_SYN_SENT | TCP_SYN_RECV)) {
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rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
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if ((rc == -EPIPE) &&
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((1 << smc->clcsock->sk->sk_state) &
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(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
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rc = 0;
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}
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if (rc < 0) {
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smc->sk.sk_err = -rc;
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release_sock(smc->clcsock->sk);
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lock_sock(&smc->sk);
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if (rc != 0 || smc->sk.sk_err) {
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smc->sk.sk_state = SMC_CLOSED;
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if (rc == -EPIPE || rc == -EAGAIN)
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smc->sk.sk_err = EPIPE;
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else if (signal_pending(current))
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smc->sk.sk_err = -sock_intr_errno(timeo);
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goto out;
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}
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@ -779,8 +794,6 @@ static void smc_connect_work(struct work_struct *work)
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smc->sk.sk_state_change(&smc->sk);
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else
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smc->sk.sk_write_space(&smc->sk);
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kfree(smc->connect_info);
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smc->connect_info = NULL;
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release_sock(&smc->sk);
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}
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@ -813,26 +826,18 @@ static int smc_connect(struct socket *sock, struct sockaddr *addr,
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smc_copy_sock_settings_to_clc(smc);
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tcp_sk(smc->clcsock->sk)->syn_smc = 1;
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if (smc->connect_nonblock) {
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rc = -EALREADY;
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goto out;
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}
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rc = kernel_connect(smc->clcsock, addr, alen, flags);
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if (rc && rc != -EINPROGRESS)
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goto out;
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if (flags & O_NONBLOCK) {
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if (smc->connect_info) {
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rc = -EALREADY;
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goto out;
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}
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smc->connect_info = kzalloc(alen + 2 * sizeof(int), GFP_KERNEL);
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if (!smc->connect_info) {
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rc = -ENOMEM;
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goto out;
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}
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smc->connect_info->alen = alen;
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smc->connect_info->flags = flags ^ O_NONBLOCK;
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memcpy(&smc->connect_info->addr, addr, alen);
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schedule_work(&smc->connect_work);
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if (schedule_work(&smc->connect_work))
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smc->connect_nonblock = 1;
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rc = -EINPROGRESS;
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} else {
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rc = kernel_connect(smc->clcsock, addr, alen, flags);
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if (rc)
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goto out;
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rc = __smc_connect(smc);
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if (rc < 0)
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goto out;
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@ -1571,8 +1576,8 @@ static __poll_t smc_poll(struct file *file, struct socket *sock,
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poll_table *wait)
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{
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struct sock *sk = sock->sk;
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__poll_t mask = 0;
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struct smc_sock *smc;
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__poll_t mask = 0;
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if (!sk)
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return EPOLLNVAL;
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@ -1582,8 +1587,6 @@ static __poll_t smc_poll(struct file *file, struct socket *sock,
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/* delegate to CLC child sock */
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mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
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sk->sk_err = smc->clcsock->sk->sk_err;
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if (sk->sk_err)
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mask |= EPOLLERR;
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} else {
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if (sk->sk_state != SMC_CLOSED)
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sock_poll_wait(file, sock, wait);
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@ -1594,9 +1597,14 @@ static __poll_t smc_poll(struct file *file, struct socket *sock,
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mask |= EPOLLHUP;
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if (sk->sk_state == SMC_LISTEN) {
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/* woken up by sk_data_ready in smc_listen_work() */
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mask = smc_accept_poll(sk);
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mask |= smc_accept_poll(sk);
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} else if (smc->use_fallback) { /* as result of connect_work()*/
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mask |= smc->clcsock->ops->poll(file, smc->clcsock,
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wait);
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sk->sk_err = smc->clcsock->sk->sk_err;
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} else {
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if (atomic_read(&smc->conn.sndbuf_space) ||
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if ((sk->sk_state != SMC_INIT &&
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atomic_read(&smc->conn.sndbuf_space)) ||
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sk->sk_shutdown & SEND_SHUTDOWN) {
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mask |= EPOLLOUT | EPOLLWRNORM;
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} else {
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@ -190,18 +190,11 @@ struct smc_connection {
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u64 peer_token; /* SMC-D token of peer */
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};
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struct smc_connect_info {
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int flags;
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int alen;
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struct sockaddr addr;
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};
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struct smc_sock { /* smc sock container */
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struct sock sk;
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struct socket *clcsock; /* internal tcp socket */
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struct smc_connection conn; /* smc connection */
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struct smc_sock *listen_smc; /* listen parent */
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struct smc_connect_info *connect_info; /* connect address & flags */
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struct work_struct connect_work; /* handle non-blocking connect*/
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struct work_struct tcp_listen_work;/* handle tcp socket accepts */
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struct work_struct smc_listen_work;/* prepare new accept socket */
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@ -219,6 +212,10 @@ struct smc_sock { /* smc sock container */
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* started, waiting for unsent
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* data to be sent
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*/
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u8 connect_nonblock : 1;
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/* non-blocking connect in
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* flight
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*/
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struct mutex clcsock_release_lock;
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/* protects clcsock of a listen
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* socket
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