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Add check for IFF_DRV_RUNNING flag after serving an interrupt and

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don't give RX path more priority than TX path.
Also remove infinite loop in interrupt handler and limit number of
iteration to 32. This change addresses system load fluctuations
under high network load.
This commit is contained in:
Pyun YongHyeon 2012-02-23 08:22:44 +00:00
parent 9b5da8166e
commit 8e10fb3d0b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=232040
1 changed files with 15 additions and 8 deletions
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23
sys/dev/sf/if_sf.c
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@ -1549,7 +1549,9 @@ sf_rxeof(struct sf_softc *sc)
*/
eidx = 0;
prog = 0;
for (cons = sc->sf_cdata.sf_rxc_cons; ; SF_INC(cons, SF_RX_CLIST_CNT)) {
for (cons = sc->sf_cdata.sf_rxc_cons;
(ifp->if_drv_flags & IFF_DRV_RUNNING) != 0;
SF_INC(cons, SF_RX_CLIST_CNT)) {
cur_cmp = &sc->sf_rdata.sf_rx_cring[cons];
status = le32toh(cur_cmp->sf_rx_status1);
if (status == 0)
@ -1852,6 +1854,7 @@ sf_intr(void *arg)
struct sf_softc *sc;
struct ifnet *ifp;
uint32_t status;
int cnt;
sc = (struct sf_softc *)arg;
SF_LOCK(sc);
@ -1870,13 +1873,13 @@ sf_intr(void *arg)
if ((ifp->if_capenable & IFCAP_POLLING) != 0)
goto done_locked;
#endif
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
goto done_locked;
/* Disable interrupts. */
csr_write_4(sc, SF_IMR, 0x00000000);
for (; (status & SF_INTRS) != 0;) {
for (cnt = 32; (status & SF_INTRS) != 0;) {
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
break;
if ((status & SF_ISR_RXDQ1_DMADONE) != 0)
sf_rxeof(sc);
@ -1911,15 +1914,19 @@ sf_intr(void *arg)
#endif
}
}
if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
sf_start_locked(ifp);
if (--cnt <= 0)
break;
/* Reading the ISR register clears all interrrupts. */
status = csr_read_4(sc, SF_ISR);
}
/* Re-enable interrupts. */
csr_write_4(sc, SF_IMR, SF_INTRS);
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) != 0) {
/* Re-enable interrupts. */
csr_write_4(sc, SF_IMR, SF_INTRS);
}
if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
sf_start_locked(ifp);
done_locked:
SF_UNLOCK(sc);
}