Author: arybchik
Date: Wed Mar 25 13:45:20 2015
New Revision: 280602
URL: https://svnweb.freebsd.org/changeset/base/280602
Log:
MFC: 280163
sfxge: prefetch txq->common if TxQ is started only
Transmit may be called when TxQ is not started yet (i.e. txq->common is
invalid). TxQ state is checked below when mbuf is processed and dropped
if TxQ is not started.
Sponsored by: Solarflare Communications, Inc.
Approved by: gnn (mentor)
Modified:
stable/10/sys/dev/sfxge/sfxge_tx.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/dev/sfxge/sfxge_tx.c
==============================================================================
--- stable/10/sys/dev/sfxge/sfxge_tx.c Wed Mar 25 13:44:01 2015
(r280601)
+++ stable/10/sys/dev/sfxge/sfxge_tx.c Wed Mar 25 13:45:20 2015
(r280602)
@@ -423,8 +423,10 @@ sfxge_tx_qdpl_drain(struct sfxge_txq *tx
stdp = &txq->dpl;
pushed = txq->added;
- prefetch_read_many(sc->enp);
- prefetch_read_many(txq->common);
+ if (__predict_true(txq->init_state == SFXGE_TXQ_STARTED)) {
+ prefetch_read_many(sc->enp);
+ prefetch_read_many(txq->common);
+ }
mbuf = stdp->std_get;
count = stdp->std_get_count;
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