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arge: ensure there's enough space in the TX ring before attempting to

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send frames.

This matches the other check for space.

"enough" is a misnomer, for "reasons".  The biggest reason is that
the TX ring is actually a circular linked list, with no head/tail pointers.
This is just a bit more headroom between head/tail so we have time to
schedule frames before we hit where the hardware is at.

Ideally this would be tunable and a little larger.
This commit is contained in:
Adrian Chadd 2015-10-30 22:55:41 +00:00
parent 3b8a3b85eb
commit 47ed24efe2
1 changed files with 1 additions and 1 deletions
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2
sys/mips/atheros/if_arge.c
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@ -1501,7 +1501,7 @@ arge_encap(struct arge_softc *sc, struct mbuf **m_head)
}
/* Check number of available descriptors. */
if (sc->arge_cdata.arge_tx_cnt + nsegs >= (ARGE_TX_RING_COUNT - 1)) {
if (sc->arge_cdata.arge_tx_cnt + nsegs >= (ARGE_TX_RING_COUNT - 2)) {
bus_dmamap_unload(sc->arge_cdata.arge_tx_tag, txd->tx_dmamap);
sc->stats.tx_pkts_nosegs++;
return (ENOBUFS);