diff options
| author | Ursula Braun <ubraun@linux.ibm.com> | 2018-04-26 18:18:22 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-04-27 21:02:52 +0300 |
| commit | 01d2f7e2cdd31becffafa0cb82809a5e36558ec0 (patch) | |
| tree | 5df8e8f6838478e51efe14206d17a522cda03ed5 /net/smc/smc_tx.c | |
| parent | ee9dfbef02d186a90f3a4876b276701966a92d10 (diff) | |
| download | linux-01d2f7e2cdd31becffafa0cb82809a5e36558ec0.tar.xz | |
net/smc: sockopts TCP_NODELAY and TCP_CORK
Setting sockopt TCP_NODELAY or resetting sockopt TCP_CORK
triggers data transfer.
For a corked SMC socket RDMA writes are deferred, if there is
still sufficient send buffer space available.
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/smc/smc_tx.c')
| -rw-r--r-- | net/smc/smc_tx.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c index 72f004c9c9b1..58dfe0bd9d60 100644 --- a/net/smc/smc_tx.c +++ b/net/smc/smc_tx.c @@ -19,6 +19,7 @@ #include <linux/sched/signal.h> #include <net/sock.h> +#include <net/tcp.h> #include "smc.h" #include "smc_wr.h" @@ -26,6 +27,7 @@ #include "smc_tx.h" #define SMC_TX_WORK_DELAY HZ +#define SMC_TX_CORK_DELAY (HZ >> 2) /* 250 ms */ /***************************** sndbuf producer *******************************/ @@ -115,6 +117,13 @@ static int smc_tx_wait_memory(struct smc_sock *smc, int flags) return rc; } +static bool smc_tx_is_corked(struct smc_sock *smc) +{ + struct tcp_sock *tp = tcp_sk(smc->clcsock->sk); + + return (tp->nonagle & TCP_NAGLE_CORK) ? true : false; +} + /* sndbuf producer: main API called by socket layer. * called under sock lock. */ @@ -209,7 +218,16 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len) /* since we just produced more new data into sndbuf, * trigger sndbuf consumer: RDMA write into peer RMBE and CDC */ - smc_tx_sndbuf_nonempty(conn); + if ((msg->msg_flags & MSG_MORE || smc_tx_is_corked(smc)) && + (atomic_read(&conn->sndbuf_space) > + (conn->sndbuf_size >> 1))) + /* for a corked socket defer the RDMA writes if there + * is still sufficient sndbuf_space available + */ + schedule_delayed_work(&conn->tx_work, + SMC_TX_CORK_DELAY); + else + smc_tx_sndbuf_nonempty(conn); } /* while (msg_data_left(msg)) */ return send_done; @@ -409,8 +427,8 @@ int smc_tx_sndbuf_nonempty(struct smc_connection *conn) } rc = 0; if (conn->alert_token_local) /* connection healthy */ - schedule_delayed_work(&conn->tx_work, - SMC_TX_WORK_DELAY); + mod_delayed_work(system_wq, &conn->tx_work, + SMC_TX_WORK_DELAY); } goto out_unlock; } |