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Do not disable interrupt without knowing whether the raised

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interrupt is ours.  Note, interrupts are automatically ACKed when
the status register is read.
Add RX/TX DMA error to interrupt handler and do full controller
reset if driver happen to encounter these errors.  There is no way
to recover from these DMA errors without controller reset.
Rename local variable name intrs with status to enhance
readability.

While I'm here, rename ET_INTR_TXEOF and ET_INTR_RXEOF to
ET_INTR_TXDMA and ET_INTR_RXDMA respectively.  These interrupts
indicate that a frame is successfully DMAed to controller's
internal FIFO and they have nothing to do with EOF(end of frame).
Driver does not need to wait actual end of TX/RX of a frame(e.g.
no need to wait the end signal of TX which is generated when a
frame in TX FIFO is emptied by MAC).  Previous names were somewhat
confusing.
This commit is contained in:
Pyun YongHyeon 2011-12-09 18:17:02 +00:00
parent e517e6f12c
commit fa1483dd2f
2 changed files with 24 additions and 18 deletions
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32
sys/dev/et/if_et.c
View File

@ -1158,34 +1158,40 @@ et_intr(void *xsc)
{
struct et_softc *sc = xsc;
struct ifnet *ifp;
uint32_t intrs;
uint32_t status;
ET_LOCK(sc);
ifp = sc->ifp;
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
ET_UNLOCK(sc);
return;
}
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
goto done;
status = CSR_READ_4(sc, ET_INTR_STATUS);
if ((status & ET_INTRS) == 0)
goto done;
/* Disable further interrupts. */
CSR_WRITE_4(sc, ET_INTR_MASK, 0xffffffff);
intrs = CSR_READ_4(sc, ET_INTR_STATUS);
if ((intrs & ET_INTRS) == 0)
goto done;
if (intrs & ET_INTR_RXEOF)
if (status & (ET_INTR_RXDMA_ERROR | ET_INTR_TXDMA_ERROR)) {
device_printf(sc->dev, "DMA error(0x%08x) -- resetting\n",
status);
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
et_init_locked(sc);
ET_UNLOCK(sc);
return;
}
if (status & ET_INTR_RXDMA)
et_rxeof(sc);
if (intrs & (ET_INTR_TXEOF | ET_INTR_TIMER))
if (status & (ET_INTR_TXDMA | ET_INTR_TIMER))
et_txeof(sc);
if (intrs & ET_INTR_TIMER)
if (status & ET_INTR_TIMER)
CSR_WRITE_4(sc, ET_TIMER, sc->sc_timer);
done:
if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
CSR_WRITE_4(sc, ET_INTR_MASK, ~ET_INTRS);
if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
et_start_locked(ifp);
}
done:
ET_UNLOCK(sc);
}

10
sys/dev/et/if_etreg.h
View File

@ -378,9 +378,9 @@
/*
* Interrupts
*/
#define ET_INTR_TXEOF 0x00000008
#define ET_INTR_TXDMA 0x00000008
#define ET_INTR_TXDMA_ERROR 0x00000010
#define ET_INTR_RXEOF 0x00000020
#define ET_INTR_RXDMA 0x00000020
#define ET_INTR_RXRING0_LOW 0x00000040
#define ET_INTR_RXRING1_LOW 0x00000080
#define ET_INTR_RXSTAT_LOW 0x00000100
@ -393,9 +393,9 @@
#define ET_INTR_MAC_STATS 0x00080000
#define ET_INTR_SLAVE_TO 0x00100000
#define ET_INTRS (ET_INTR_TXEOF | \
ET_INTR_RXEOF | \
ET_INTR_TIMER)
#define ET_INTRS \
(ET_INTR_TXDMA | ET_INTR_RXDMA | ET_INTR_TIMER | \
ET_INTR_TXDMA_ERROR | ET_INTR_RXDMA_ERROR)
/*
* RX ring position uses same layout