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authorUrsula Braun <ubraun@linux.vnet.ibm.com>2017-04-10 14:57:59 +0200
committerDavid S. Miller <davem@davemloft.net>2017-04-11 23:01:14 -0400
commit90cacb2ea60c37b9a413a2d7dcb244c3d397c060 (patch)
tree89f9ba792ee7110c89dd5a61345d77a854bdce13 /net/smc
parent5da7e4d35507992da2af6c89434c33a69802de9c (diff)
downloadlinux-90cacb2ea60c37b9a413a2d7dcb244c3d397c060.tar.bz2
net/smc: guarantee reset of write_blocked for heavy workload
If peer indicates write_blocked, the cursor state of the received data should be send to the peer immediately (in smc_tx_consumer_update()). Afterwards the write_blocked indicator is cleared. If there is no free slot for another write request, sending is postponed to worker smc_tx_work, and the write_blocked indicator is not cleared. Therefore another clearing check is needed in smc_tx_work(). Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Reviewed-by: Thomas Richter <tmricht@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/smc')
-rw-r--r--net/smc/smc_tx.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c
index 69a0013dd25c..21ec1832ab51 100644
--- a/net/smc/smc_tx.c
+++ b/net/smc/smc_tx.c
@@ -431,9 +431,13 @@ static void smc_tx_work(struct work_struct *work)
struct smc_connection,
tx_work);
struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
+ int rc;
lock_sock(&smc->sk);
- smc_tx_sndbuf_nonempty(conn);
+ 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;
release_sock(&smc->sk);
}