From: Karsten Graul Date: Tue, 12 Feb 2019 16:29:53 +0100 Subject: net/smc: reduce amount of status updates to peer Git-commit: cf0cfe535845cf60830e1482f7e618d80140e8d9 Patch-mainline: v5.1-rc1 References: bsc#1129857 bsc#1129861 LTC#176247 LTC#176250 In smc_cdc_msg_recv_action() the received cdc message is evaluated. To reduce the number of messaged triggered by this evaluation the logic is streamlined. For the write_blocked condition we do not need to send a response immediately. The remaining conditions can be put together into one if clause. Signed-off-by: Karsten Graul Signed-off-by: Ursula Braun Signed-off-by: David S. Miller Acked-by: Petr Tesarik --- net/smc/smc_cdc.c | 22 ++++++++-------------- 1 file changed, 8 insertions(+), 14 deletions(-) diff --git a/net/smc/smc_cdc.c b/net/smc/smc_cdc.c index 780b36c69292..28bbdb04bc35 100644 --- a/net/smc/smc_cdc.c +++ b/net/smc/smc_cdc.c @@ -273,24 +273,18 @@ static void smc_cdc_msg_recv_action(struct smc_sock *smc, smp_mb__after_atomic(); smc->sk.sk_data_ready(&smc->sk); } else { - if (conn->local_rx_ctrl.prod_flags.write_blocked || - conn->local_rx_ctrl.prod_flags.cons_curs_upd_req || - conn->local_rx_ctrl.prod_flags.urg_data_pending) { - if (conn->local_rx_ctrl.prod_flags.urg_data_pending) - conn->urg_state = SMC_URG_NOTYET; - /* force immediate tx of current consumer cursor, but - * under send_lock to guarantee arrival in seqno-order - */ - if (smc->sk.sk_state != SMC_INIT) - smc_tx_sndbuf_nonempty(conn); - } + if (conn->local_rx_ctrl.prod_flags.write_blocked) + smc->sk.sk_data_ready(&smc->sk); + if (conn->local_rx_ctrl.prod_flags.urg_data_pending) + conn->urg_state = SMC_URG_NOTYET; } - /* piggy backed tx info */ /* trigger sndbuf consumer: RDMA write into peer RMBE and CDC */ - if (diff_cons && smc_tx_prepared_sends(conn)) { + if ((diff_cons && smc_tx_prepared_sends(conn)) || + conn->local_rx_ctrl.prod_flags.cons_curs_upd_req || + conn->local_rx_ctrl.prod_flags.urg_data_pending) smc_tx_sndbuf_nonempty(conn); - } + if (diff_cons && conn->urg_tx_pend && atomic_read(&conn->peer_rmbe_space) == conn->peer_rmbe_size) { /* urg data confirmed by peer, indicate we're ready for more */