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if_awg: drain tx buffers and clear rx buffers when stopping

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Stale packets should not be transmitted when the interface comes up after being down.
Count the successfully transmitted ones for statistics and drop the rest.

Submitted by:	Guy Yur <guyyur@gmail.com>
Differential Revision:	https://reviews.freebsd.org/D12539
This commit is contained in:
Emmanuel Vadot 2017-11-18 21:12:06 +00:00
parent bd9063297c
commit 3f9ade0643
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=325985
1 changed files with 36 additions and 0 deletions
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36
sys/arm/allwinner/if_awg.c
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@ -215,6 +215,8 @@ static struct resource_spec awg_spec[] = {
{ -1, 0 }
};
static void awg_txeof(struct awg_softc *sc);
static int
awg_miibus_readreg(device_t dev, int phy, int reg)
{
@ -809,6 +811,7 @@ awg_stop(struct awg_softc *sc)
{
if_t ifp;
uint32_t val;
int i;
AWG_ASSERT_LOCKED(sc);
@ -843,6 +846,39 @@ awg_stop(struct awg_softc *sc)
sc->link = 0;
/* Finish handling transmitted buffers */
awg_txeof(sc);
/* Release any untransmitted buffers. */
for (i = sc->tx.next; sc->tx.queued > 0; i = TX_NEXT(i)) {
val = le32toh(sc->tx.desc_ring[i].status);
if ((val & TX_DESC_CTL) != 0)
break;
awg_clean_txbuf(sc, i);
}
sc->tx.next = i;
for (; sc->tx.queued > 0; i = TX_NEXT(i)) {
sc->tx.desc_ring[i].status = 0;
awg_clean_txbuf(sc, i);
}
sc->tx.cur = sc->tx.next;
bus_dmamap_sync(sc->tx.desc_tag, sc->tx.desc_map,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
/* Setup RX buffers for reuse */
bus_dmamap_sync(sc->rx.desc_tag, sc->rx.desc_map,
BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
for (i = sc->rx.cur; ; i = RX_NEXT(i)) {
val = le32toh(sc->rx.desc_ring[i].status);
if ((val & RX_DESC_CTL) != 0)
break;
awg_reuse_rxdesc(sc, i);
}
sc->rx.cur = i;
bus_dmamap_sync(sc->rx.desc_tag, sc->rx.desc_map,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
}