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net/smc: reduce amount of status updates to peer

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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 <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:
Karsten Graul 2019-02-12 16:29:53 +01:00 committed by David S. Miller
parent 16297d1439
commit cf0cfe5358
1 changed files with 8 additions and 14 deletions
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22
net/smc/smc_cdc.c
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@ -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 */