src/sys/dev/pci/if_wm.c - diff

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version 1.469, 2017/01/26 10:14:52

version 1.470, 2017/01/27 05:04:47

Line 7018 wm_nq_transmit(struct ifnet *ifp, struct

if (m->m_flags & M_MCAST)

ifp->if_omcasts++;

* The situations which this mutex_tryenter() fails at running time

* are below two patterns.

* (1) contention with interrupt handler(wm_txrxintr_msix())

* (2) contention with deferred if_start softint(wm_deferred_start())

* In the case of (1), the last packet enqueued to txq->txq_interq is

* dequeued by wm_deferred_start(). So, it does not get stuck.

* In the case of (2), the last packet enqueued to txq->txq_interq is also

* dequeued by wm_deferred_start(). So, it does not get stuck, either.

if (mutex_tryenter(txq->txq_lock)) {

if (!txq->txq_stopping)

wm_nq_transmit_locked(ifp, txq);