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Further rl(4) locking improvements:
- Avoid unnecessary re-acquisition elsewhere by adding *_locked() entry points as needed. - Correct locking for the DEVICE_POLLING case. - Hold the driver lock for the entire duration of interrupt servicing, to avoid unneeded, expensive re-acquisition; use *_locked() entry points as needed. Reviewed by: -net (silence)
This commit is contained in:
Bruce M Simpson
parent
0ac4013324
commit
cdeef8e7f3
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=131841
119
sys/pci/if_rl.c
119
sys/pci/if_rl.c
@ -187,6 +187,7 @@ static void rl_ifmedia_sts (struct ifnet *, struct ifmediareq *);
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static int rl_ioctl (struct ifnet *, u_long, caddr_t);
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static void rl_intr (void *);
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static void rl_init (void *);
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static void rl_init_locked (struct rl_softc *sc);
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static void rl_mii_send (struct rl_softc *, uint32_t, int);
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static void rl_mii_sync (struct rl_softc *);
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static int rl_mii_readreg (struct rl_softc *, struct rl_mii_frame *);
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@ -194,6 +195,12 @@ static int rl_mii_writereg (struct rl_softc *, struct rl_mii_frame *);
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static int rl_miibus_readreg (device_t, int, int);
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static void rl_miibus_statchg (device_t);
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static int rl_miibus_writereg (device_t, int, int, int);
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#ifdef DEVICE_POLLING
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static void rl_poll (struct ifnet *ifp, enum poll_cmd cmd,
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int count);
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static void rl_poll_locked (struct ifnet *ifp, enum poll_cmd cmd,
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int count);
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#endif
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static int rl_probe (device_t);
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static void rl_read_eeprom (struct rl_softc *, uint8_t *, int, int, int);
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static void rl_reset (struct rl_softc *);
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@ -202,6 +209,7 @@ static void rl_rxeof (struct rl_softc *);
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static void rl_setmulti (struct rl_softc *);
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static void rl_shutdown (device_t);
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static void rl_start (struct ifnet *);
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static void rl_start_locked (struct ifnet *);
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static void rl_stop (struct rl_softc *);
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static int rl_suspend (device_t);
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static void rl_tick (void *);
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@ -1131,7 +1139,7 @@ rl_rxeof(struct rl_softc *sc)
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if (!(rxstat & RL_RXSTAT_RXOK)) {
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ifp->if_ierrors++;
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rl_init(sc);
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rl_init_locked(sc);
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return;
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}
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@ -1234,7 +1242,7 @@ rl_txeof(struct rl_softc *sc)
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oldthresh = sc->rl_txthresh;
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/* error recovery */
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rl_reset(sc);
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rl_init(sc);
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rl_init_locked(sc);
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/*
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* If there was a transmit underrun,
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* bump the TX threshold.
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@ -1269,11 +1277,21 @@ rl_tick(void *xsc)
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#ifdef DEVICE_POLLING
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static void
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rl_poll (struct ifnet *ifp, enum poll_cmd cmd, int count)
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rl_poll(struct ifnet *ifp, enum poll_cmd cmd, int count)
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{
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struct rl_softc *sc = ifp->if_softc;
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RL_LOCK(sc);
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rl_poll_locked(ifp, cmd, count);
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RL_UNLOCK(sc);
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}
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static void
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rl_poll_locked(struct ifnet *ifp, enum poll_cmd cmd, int count)
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{
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struct rl_softc *sc = ifp->if_softc;
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RL_LOCK_ASSERT(sc);
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if (!(ifp->if_capenable & IFCAP_POLLING)) {
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ether_poll_deregister(ifp);
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@ -1283,18 +1301,15 @@ rl_poll (struct ifnet *ifp, enum poll_cmd cmd, int count)
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if (cmd == POLL_DEREGISTER) {
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/* Final call; enable interrupts. */
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CSR_WRITE_2(sc, RL_IMR, RL_INTRS);
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goto done;
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return;
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}
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sc->rxcycles = count;
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rl_rxeof(sc);
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rl_txeof(sc);
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if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) {
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RL_UNLOCK(sc);
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rl_start(ifp);
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RL_LOCK(sc);
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}
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if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
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rl_start_locked(ifp);
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if (cmd == POLL_AND_CHECK_STATUS) {
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uint16_t status;
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@ -1302,7 +1317,7 @@ rl_poll (struct ifnet *ifp, enum poll_cmd cmd, int count)
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/* We should also check the status register. */
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status = CSR_READ_2(sc, RL_ISR);
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if (status == 0xffff)
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goto done;
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return;
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if (status != 0)
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CSR_WRITE_2(sc, RL_ISR, status);
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@ -1310,13 +1325,9 @@ rl_poll (struct ifnet *ifp, enum poll_cmd cmd, int count)
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if (status & RL_ISR_SYSTEM_ERR) {
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rl_reset(sc);
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RL_UNLOCK(sc);
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rl_init(sc);
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RL_LOCK(sc);
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rl_init_locked(sc);
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}
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}
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done:
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RL_UNLOCK(sc);
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}
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#endif /* DEVICE_POLLING */
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@ -1329,23 +1340,19 @@ rl_intr(void *arg)
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RL_LOCK(sc);
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if (sc->suspended) {
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RL_UNLOCK(sc);
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return;
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}
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if (sc->suspended)
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goto done_locked;
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#ifdef DEVICE_POLLING
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if (ifp->if_flags & IFF_POLLING) {
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RL_UNLOCK(sc);
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return;
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}
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if (ifp->if_flags & IFF_POLLING)
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goto done_locked;
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if ((ifp->if_capenable & IFCAP_POLLING) &&
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ether_poll_register(rl_poll, ifp)) {
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/* Disable interrupts. */
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CSR_WRITE_2(sc, RL_IMR, 0x0000);
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RL_UNLOCK(sc);
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rl_poll(ifp, 0, 1);
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return;
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rl_poll_locked(ifp, 0, 1);
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goto done_locked;
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}
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#endif /* DEVICE_POLLING */
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@ -1366,16 +1373,15 @@ rl_intr(void *arg)
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rl_txeof(sc);
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if (status & RL_ISR_SYSTEM_ERR) {
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rl_reset(sc);
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RL_UNLOCK(sc);
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rl_init(sc);
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RL_LOCK(sc);
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rl_init_locked(sc);
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}
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}
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RL_UNLOCK(sc);
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if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
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rl_start(ifp);
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rl_start_locked(ifp);
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done_locked:
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RL_UNLOCK(sc);
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}
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/*
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@ -1425,23 +1431,33 @@ rl_encap(struct rl_softc *sc, struct mbuf *m_head)
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/*
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* Main transmit routine.
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*/
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static void
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rl_start(struct ifnet *ifp)
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{
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struct rl_softc *sc = ifp->if_softc;
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struct mbuf *m_head = NULL;
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RL_LOCK(sc);
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rl_start_locked(ifp);
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RL_UNLOCK(sc);
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}
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static void
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rl_start_locked(struct ifnet *ifp)
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{
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struct rl_softc *sc = ifp->if_softc;
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struct mbuf *m_head = NULL;
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RL_LOCK_ASSERT(sc);
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while (RL_CUR_TXMBUF(sc) == NULL) {
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IFQ_DRV_DEQUEUE(&ifp->if_snd, m_head);
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if (m_head == NULL)
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break;
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if (rl_encap(sc, m_head)) {
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if (rl_encap(sc, m_head))
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break;
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}
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/* Pass a copy of this mbuf chain to the bpf subsystem. */
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BPF_MTAP(ifp, RL_CUR_TXMBUF(sc));
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@ -1470,19 +1486,27 @@ rl_start(struct ifnet *ifp)
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*/
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if (RL_CUR_TXMBUF(sc) != NULL)
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ifp->if_flags |= IFF_OACTIVE;
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RL_UNLOCK(sc);
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}
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static void
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rl_init(void *xsc)
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{
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struct rl_softc *sc = xsc;
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RL_LOCK(sc);
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rl_init_locked(sc);
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RL_UNLOCK(sc);
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}
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static void
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rl_init_locked(struct rl_softc *sc)
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{
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struct ifnet *ifp = &sc->arpcom.ac_if;
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struct mii_data *mii;
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uint32_t rxcfg = 0;
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RL_LOCK(sc);
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RL_LOCK_ASSERT(sc);
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mii = device_get_softc(sc->rl_miibus);
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/*
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@ -1573,8 +1597,6 @@ rl_init(void *xsc)
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ifp->if_flags &= ~IFF_OACTIVE;
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sc->rl_stat_ch = timeout(rl_tick, sc, hz);
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RL_UNLOCK(sc);
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}
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/*
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@ -1619,14 +1641,14 @@ rl_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
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switch (command) {
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case SIOCSIFFLAGS:
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RL_LOCK(sc);
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if (ifp->if_flags & IFF_UP) {
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rl_init(sc);
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rl_init_locked(sc);
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} else {
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if (ifp->if_flags & IFF_RUNNING)
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RL_LOCK(sc);
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rl_stop(sc);
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RL_UNLOCK(sc);
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}
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RL_UNLOCK(sc);
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error = 0;
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break;
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case SIOCADDMULTI:
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@ -1665,10 +1687,9 @@ rl_watchdog(struct ifnet *ifp)
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rl_txeof(sc);
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rl_rxeof(sc);
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rl_init_locked(sc);
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RL_UNLOCK(sc);
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rl_init(sc);
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}
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/*
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@ -1745,12 +1766,14 @@ rl_resume(device_t dev)
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sc = device_get_softc(dev);
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ifp = &sc->arpcom.ac_if;
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RL_LOCK(sc);
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/* reinitialize interface if necessary */
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if (ifp->if_flags & IFF_UP)
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rl_init(sc);
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rl_init_locked(sc);
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RL_LOCK(sc);
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sc->suspended = 0;
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RL_UNLOCK(sc);
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return (0);
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