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sfxge: expect required init_state on data path and in periodic calls 

With the patch applied the number of instruction events is 1% less and
number of mispredicted branch events is 5% less under multistream TCP
traffic load close to line rate.

Sponsored by:   Solarflare Communications, Inc.
Approved by:    gnn (mentor)
This commit is contained in:
Andrew Rybchenko 2015-02-27 07:39:09 +00:00
parent b83391bf44
commit 851128b8de
5 changed files with 18 additions and 17 deletions
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10
sys/dev/sfxge/sfxge_ev.c
View File

@ -103,7 +103,7 @@ sfxge_ev_rx(void *arg, uint32_t label, uint32_t id, uint32_t size,
KASSERT(evq->index == rxq->index,
("evq->index != rxq->index"));
if (rxq->init_state != SFXGE_RXQ_STARTED)
if (__predict_false(rxq->init_state != SFXGE_RXQ_STARTED))
goto done;
expected = rxq->pending++ & rxq->ptr_mask;
@ -256,7 +256,7 @@ sfxge_ev_tx(void *arg, uint32_t label, uint32_t id)
KASSERT(evq->index == txq->evq_index,
("evq->index != txq->evq_index"));
if (txq->init_state != SFXGE_TXQ_STARTED)
if (__predict_false(txq->init_state != SFXGE_TXQ_STARTED))
goto done;
stop = (id + 1) & txq->ptr_mask;
@ -433,7 +433,7 @@ sfxge_ev_stat_update(struct sfxge_softc *sc)
SFXGE_ADAPTER_LOCK(sc);
if (sc->evq[0]->init_state != SFXGE_EVQ_STARTED)
if (__predict_false(sc->evq[0]->init_state != SFXGE_EVQ_STARTED))
goto out;
now = ticks;
@ -598,8 +598,8 @@ sfxge_ev_qpoll(struct sfxge_evq *evq)
SFXGE_EVQ_LOCK(evq);
if (evq->init_state != SFXGE_EVQ_STARTING &&
evq->init_state != SFXGE_EVQ_STARTED) {
if (__predict_false(evq->init_state != SFXGE_EVQ_STARTING &&
evq->init_state != SFXGE_EVQ_STARTED)) {
rc = EINVAL;
goto fail;
}

2
sys/dev/sfxge/sfxge_intr.c
View File

@ -134,7 +134,7 @@ sfxge_intr_message(void *arg)
KASSERT(intr->type == EFX_INTR_MESSAGE,
("intr->type != EFX_INTR_MESSAGE"));
if (intr->state != SFXGE_INTR_STARTED)
if (__predict_false(intr->state != SFXGE_INTR_STARTED))
return;
(void)efx_intr_status_message(enp, index, &fatal);

13
sys/dev/sfxge/sfxge_port.c
View File

@ -50,7 +50,7 @@ sfxge_mac_stat_update(struct sfxge_softc *sc)
SFXGE_PORT_LOCK_ASSERT_OWNED(port);
if (port->init_state != SFXGE_PORT_STARTED) {
if (__predict_false(port->init_state != SFXGE_PORT_STARTED)) {
rc = 0;
goto out;
}
@ -241,7 +241,7 @@ sfxge_port_wanted_fc_handler(SYSCTL_HANDLER_ARGS)
SFXGE_PORT_LOCK(port);
if (port->wanted_fc != fcntl) {
if (port->init_state == SFXGE_PORT_STARTED)
if (__predict_false(port->init_state == SFXGE_PORT_STARTED))
error = efx_mac_fcntl_set(sc->enp,
port->wanted_fc,
B_TRUE);
@ -272,7 +272,8 @@ sfxge_port_link_fc_handler(SYSCTL_HANDLER_ARGS)
port = &sc->port;
SFXGE_PORT_LOCK(port);
if (port->init_state == SFXGE_PORT_STARTED && SFXGE_LINK_UP(sc))
if (__predict_true(port->init_state == SFXGE_PORT_STARTED) &&
SFXGE_LINK_UP(sc))
efx_mac_fcntl_get(sc->enp, &wanted_fc, &link_fc);
else
link_fc = 0;
@ -327,7 +328,7 @@ sfxge_mac_poll_work(void *arg, int npending)
SFXGE_PORT_LOCK(port);
if (port->init_state != SFXGE_PORT_STARTED)
if (__predict_false(port->init_state != SFXGE_PORT_STARTED))
goto done;
/* This may sleep waiting for MCDI completion */
@ -394,7 +395,7 @@ sfxge_mac_filter_set(struct sfxge_softc *sc)
* lock is held in sleeping thread. Both problems are repeatable
* on LAG with LACP proto bring up.
*/
if (port->init_state == SFXGE_PORT_STARTED)
if (__predict_true(port->init_state == SFXGE_PORT_STARTED))
rc = sfxge_mac_filter_set_locked(sc);
else
rc = 0;
@ -518,7 +519,7 @@ sfxge_phy_stat_update(struct sfxge_softc *sc)
SFXGE_PORT_LOCK_ASSERT_OWNED(port);
if (port->init_state != SFXGE_PORT_STARTED) {
if (__predict_false(port->init_state != SFXGE_PORT_STARTED)) {
rc = 0;
goto out;
}

6
sys/dev/sfxge/sfxge_rx.c
View File

@ -209,7 +209,7 @@ sfxge_rx_qfill(struct sfxge_rxq *rxq, unsigned int target, boolean_t retrying)
SFXGE_EVQ_LOCK_ASSERT_OWNED(evq);
if (rxq->init_state != SFXGE_RXQ_STARTED)
if (__predict_false(rxq->init_state != SFXGE_RXQ_STARTED))
return;
rxfill = rxq->added - rxq->completed;
@ -269,7 +269,7 @@ void
sfxge_rx_qrefill(struct sfxge_rxq *rxq)
{
if (rxq->init_state != SFXGE_RXQ_STARTED)
if (__predict_false(rxq->init_state != SFXGE_RXQ_STARTED))
return;
/* Make sure the queue is full */
@ -760,7 +760,7 @@ sfxge_rx_qcomplete(struct sfxge_rxq *rxq, boolean_t eop)
rx_desc = &rxq->queue[id];
m = rx_desc->mbuf;
if (rxq->init_state != SFXGE_RXQ_STARTED)
if (__predict_false(rxq->init_state != SFXGE_RXQ_STARTED))
goto discard;
if (rx_desc->flags & (EFX_ADDR_MISMATCH | EFX_DISCARD))

4
sys/dev/sfxge/sfxge_tx.c
View File

@ -311,7 +311,7 @@ static int sfxge_tx_queue_mbuf(struct sfxge_txq *txq, struct mbuf *mbuf)
if (mbuf->m_pkthdr.csum_flags & CSUM_TSO)
prefetch_read_many(mbuf->m_data);
if (txq->init_state != SFXGE_TXQ_STARTED) {
if (__predict_false(txq->init_state != SFXGE_TXQ_STARTED)) {
rc = EINTR;
goto reject;
}
@ -1143,7 +1143,7 @@ sfxge_tx_qunblock(struct sfxge_txq *txq)
SFXGE_EVQ_LOCK_ASSERT_OWNED(evq);
if (txq->init_state != SFXGE_TXQ_STARTED)
if (__predict_false(txq->init_state != SFXGE_TXQ_STARTED))
return;
SFXGE_TXQ_LOCK(txq);