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Increase TX_MAX_SEGS from 10 to 20 for the if_awg.c driver

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Under certain traffic pattern awg driver does not recover from TX queue
full condition. The actual source of the problem is not identified yet
but jmcneill@ agreed that bumping TX_MAX_SEGS to 20 is OK as a workaround
for the problem (NetBSD has it set to 128).

Also add some diagnostic printfs to prevent silent failure of bus_dma
functions in the future

PR will be kept open until root cause of the issue is identified and fixed

PR:		219927
Submitted by:	Tom Vijlbrief <tvijlbrief@gmail.com>
Approved by:	jmcneill
MFC after:	2 weeks
This commit is contained in:
Oleksandr Tymoshenko 2017-11-04 23:28:02 +00:00
parent d949e92a9c
commit 031d577716
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=325410
1 changed files with 9 additions and 3 deletions
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12
sys/arm/allwinner/if_awg.c
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@ -92,7 +92,7 @@ __FBSDID("$FreeBSD$");
#define TX_SKIP(n, o) (((n) + (o)) & (TX_DESC_COUNT - 1))
#define RX_NEXT(n) (((n) + 1) & (RX_DESC_COUNT - 1))
#define TX_MAX_SEGS 10
#define TX_MAX_SEGS 20
#define SOFT_RST_RETRY 1000
#define MII_BUSY_RETRY 1000
@ -192,6 +192,7 @@ struct awg_softc {
struct resource *res[_RES_NITEMS];
struct mtx mtx;
if_t ifp;
device_t dev;
device_t miibus;
struct callout stat_ch;
struct task link_task;
@ -421,14 +422,18 @@ awg_setup_txbuf(struct awg_softc *sc, int index, struct mbuf **mp)
sc->tx.buf_map[index].map, m, segs, &nsegs, BUS_DMA_NOWAIT);
if (error == EFBIG) {
m = m_collapse(m, M_NOWAIT, TX_MAX_SEGS);
if (m == NULL)
if (m == NULL) {
device_printf(sc->dev, "awg_setup_txbuf: m_collapse failed\n");
return (0);
}
*mp = m;
error = bus_dmamap_load_mbuf_sg(sc->tx.buf_tag,
sc->tx.buf_map[index].map, m, segs, &nsegs, BUS_DMA_NOWAIT);
}
if (error != 0)
if (error != 0) {
device_printf(sc->dev, "awg_setup_txbuf: bus_dmamap_load_mbuf_sg failed\n");
return (0);
}
bus_dmamap_sync(sc->tx.buf_tag, sc->tx.buf_map[index].map,
BUS_DMASYNC_PREWRITE);
@ -1613,6 +1618,7 @@ awg_attach(device_t dev)
int error;
sc = device_get_softc(dev);
sc->dev = dev;
sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
node = ofw_bus_get_node(dev);