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Several fixes to this driver:

Browse Source 
- Overhaul the locking to avoid recursion and add missing locking in a few
  places.
- Don't schedule a task to call vge_start() from contexts that are safe to
  call vge_start() directly.  Just invoke the routine directly instead
  (this is what all of the other NIC drivers I am familiar with do).  Note
  that vge(4) does not use an interrupt filter handler which is the primary
  reason some other drivers use tasks.
- Add a new private timer to drive the watchdog timer instead of using
  if_watchdog and if_timer.
- Fixup detach by calling ether_ifdetach() before stopping the interface.
This commit is contained in:
John Baldwin 2009-11-19 19:35:15 +00:00
parent 71098608fc
commit 67e1dfa795
2 changed files with 81 additions and 81 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

159
sys/dev/vge/if_vge.c
View File

@ -93,7 +93,6 @@ __FBSDID("$FreeBSD$");
#include <sys/module.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/taskqueue.h>
#include <net/if.h>
#include <net/if_arp.h>
@ -160,12 +159,13 @@ static int vge_rxeof (struct vge_softc *);
static void vge_txeof (struct vge_softc *);
static void vge_intr (void *);
static void vge_tick (void *);
static void vge_tx_task (void *, int);
static void vge_start (struct ifnet *);
static void vge_start_locked (struct ifnet *);
static int vge_ioctl (struct ifnet *, u_long, caddr_t);
static void vge_init (void *);
static void vge_init_locked (struct vge_softc *);
static void vge_stop (struct vge_softc *);
static void vge_watchdog (struct ifnet *);
static void vge_watchdog (void *);
static int vge_suspend (device_t);
static int vge_resume (device_t);
static int vge_shutdown (device_t);
@ -378,7 +378,7 @@ vge_miibus_readreg(dev, phy, reg)
if (phy != (CSR_READ_1(sc, VGE_MIICFG) & 0x1F))
return(0);
VGE_LOCK(sc);
VGE_LOCK_ASSERT(sc);
vge_miipoll_stop(sc);
/* Specify the register we want to read. */
@ -400,7 +400,6 @@ vge_miibus_readreg(dev, phy, reg)
rval = CSR_READ_2(sc, VGE_MIIDATA);
vge_miipoll_start(sc);
VGE_UNLOCK(sc);
return (rval);
}
@ -418,7 +417,7 @@ vge_miibus_writereg(dev, phy, reg, data)
if (phy != (CSR_READ_1(sc, VGE_MIICFG) & 0x1F))
return(0);
VGE_LOCK(sc);
VGE_LOCK_ASSERT(sc);
vge_miipoll_stop(sc);
/* Specify the register we want to write. */
@ -443,7 +442,6 @@ vge_miibus_writereg(dev, phy, reg, data)
}
vge_miipoll_start(sc);
VGE_UNLOCK(sc);
return (rval);
}
@ -929,7 +927,9 @@ vge_attach(dev)
sc->vge_dev = dev;
mtx_init(&sc->vge_mtx, device_get_nameunit(dev), MTX_NETWORK_LOCK,
MTX_DEF | MTX_RECURSE);
MTX_DEF);
callout_init_mtx(&sc->vge_watchdog, &sc->vge_mtx, 0);
/*
* Map control/status registers.
*/
@ -1014,14 +1014,11 @@ vge_attach(dev)
#ifdef DEVICE_POLLING
ifp->if_capabilities |= IFCAP_POLLING;
#endif
ifp->if_watchdog = vge_watchdog;
ifp->if_init = vge_init;
IFQ_SET_MAXLEN(&ifp->if_snd, VGE_IFQ_MAXLEN);
ifp->if_snd.ifq_drv_maxlen = VGE_IFQ_MAXLEN;
IFQ_SET_READY(&ifp->if_snd);
TASK_INIT(&sc->vge_txtask, 0, vge_tx_task, ifp);
/*
* Call MI attach routine.
*/
@ -1070,21 +1067,11 @@ vge_detach(dev)
/* These should only be active if attach succeeded */
if (device_is_attached(dev)) {
vge_stop(sc);
/*
* Force off the IFF_UP flag here, in case someone
* still had a BPF descriptor attached to this
* interface. If they do, ether_ifattach() will cause
* the BPF code to try and clear the promisc mode
* flag, which will bubble down to vge_ioctl(),
* which will try to call vge_init() again. This will
* turn the NIC back on and restart the MII ticker,
* which will panic the system when the kernel tries
* to invoke the vge_tick() function that isn't there
* anymore.
*/
ifp->if_flags &= ~IFF_UP;
ether_ifdetach(ifp);
VGE_LOCK(sc);
vge_stop(sc);
VGE_UNLOCK(sc);
callout_drain(&sc->vge_watchdog);
}
if (sc->vge_miibus)
device_delete_child(dev, sc->vge_miibus);
@ -1523,7 +1510,7 @@ vge_txeof(sc)
if (idx != sc->vge_ldata.vge_tx_considx) {
sc->vge_ldata.vge_tx_considx = idx;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
ifp->if_timer = 0;
sc->vge_timer = 0;
}
/*
@ -1549,7 +1536,7 @@ vge_tick(xsc)
sc = xsc;
ifp = sc->vge_ifp;
VGE_LOCK(sc);
VGE_LOCK_ASSERT(sc);
mii = device_get_softc(sc->vge_miibus);
mii_tick(mii);
@ -1566,13 +1553,10 @@ vge_tick(xsc)
if_link_state_change(sc->vge_ifp,
LINK_STATE_UP);
if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
taskqueue_enqueue(taskqueue_swi,
&sc->vge_txtask);
vge_start_locked(ifp);
}
}
VGE_UNLOCK(sc);
return;
}
@ -1592,7 +1576,7 @@ vge_poll (struct ifnet *ifp, enum poll_cmd cmd, int count)
vge_txeof(sc);
if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
taskqueue_enqueue(taskqueue_swi, &sc->vge_txtask);
vge_start_locked(ifp);
if (cmd == POLL_AND_CHECK_STATUS) { /* also check status register */
u_int32_t status;
@ -1608,7 +1592,7 @@ vge_poll (struct ifnet *ifp, enum poll_cmd cmd, int count)
if (status & VGE_ISR_TXDMA_STALL ||
status & VGE_ISR_RXDMA_STALL)
vge_init(sc);
vge_init_locked(sc);
if (status & (VGE_ISR_RXOFLOW|VGE_ISR_RXNODESC)) {
vge_rxeof(sc);
@ -1681,7 +1665,7 @@ vge_intr(arg)
vge_txeof(sc);
if (status & (VGE_ISR_TXDMA_STALL|VGE_ISR_RXDMA_STALL))
vge_init(sc);
vge_init_locked(sc);
if (status & VGE_ISR_LINKSTS)
vge_tick(sc);
@ -1690,10 +1674,10 @@ vge_intr(arg)
/* Re-enable interrupts */
CSR_WRITE_1(sc, VGE_CRS3, VGE_CR3_INT_GMSK);
VGE_UNLOCK(sc);
if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
taskqueue_enqueue(taskqueue_swi, &sc->vge_txtask);
vge_start_locked(ifp);
VGE_UNLOCK(sc);
return;
}
@ -1774,19 +1758,6 @@ vge_encap(sc, m_head, idx)
return (0);
}
static void
vge_tx_task(arg, npending)
void *arg;
int npending;
{
struct ifnet *ifp;
ifp = arg;
vge_start(ifp);
return;
}
/*
* Main transmit routine.
*/
@ -1796,21 +1767,29 @@ vge_start(ifp)
struct ifnet *ifp;
{
struct vge_softc *sc;
sc = ifp->if_softc;
VGE_LOCK(sc);
vge_start_locked(ifp);
VGE_UNLOCK(sc);
}
static void
vge_start_locked(ifp)
struct ifnet *ifp;
{
struct vge_softc *sc;
struct mbuf *m_head = NULL;
int idx, pidx = 0;
sc = ifp->if_softc;
VGE_LOCK(sc);
VGE_LOCK_ASSERT(sc);
if (!sc->vge_link || ifp->if_drv_flags & IFF_DRV_OACTIVE) {
VGE_UNLOCK(sc);
if (!sc->vge_link || ifp->if_drv_flags & IFF_DRV_OACTIVE)
return;
}
if (IFQ_DRV_IS_EMPTY(&ifp->if_snd)) {
VGE_UNLOCK(sc);
if (IFQ_DRV_IS_EMPTY(&ifp->if_snd))
return;
}
idx = sc->vge_ldata.vge_tx_prodidx;
@ -1843,10 +1822,8 @@ vge_start(ifp)
ETHER_BPF_MTAP(ifp, m_head);
}
if (idx == sc->vge_ldata.vge_tx_prodidx) {
VGE_UNLOCK(sc);
if (idx == sc->vge_ldata.vge_tx_prodidx)
return;
}
/* Flush the TX descriptors */
@ -1870,12 +1847,10 @@ vge_start(ifp)
*/
CSR_WRITE_1(sc, VGE_CRS1, VGE_CR1_TIMER0_ENABLE);
VGE_UNLOCK(sc);
/*
* Set a timeout in case the chip goes out to lunch.
*/
ifp->if_timer = 5;
sc->vge_timer = 5;
return;
}
@ -1885,11 +1860,20 @@ vge_init(xsc)
void *xsc;
{
struct vge_softc *sc = xsc;
VGE_LOCK(sc);
vge_init_locked(sc);
VGE_UNLOCK(sc);
}
static void
vge_init_locked(struct vge_softc *sc)
{
struct ifnet *ifp = sc->vge_ifp;
struct mii_data *mii;
int i;
VGE_LOCK(sc);
VGE_LOCK_ASSERT(sc);
mii = device_get_softc(sc->vge_miibus);
/*
@ -2045,12 +2029,11 @@ vge_init(xsc)
ifp->if_drv_flags |= IFF_DRV_RUNNING;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
callout_reset(&sc->vge_watchdog, hz, vge_watchdog, sc);
sc->vge_if_flags = 0;
sc->vge_link = 0;
VGE_UNLOCK(sc);
return;
}
@ -2087,7 +2070,9 @@ vge_ifmedia_sts(ifp, ifmr)
sc = ifp->if_softc;
mii = device_get_softc(sc->vge_miibus);
VGE_LOCK(sc);
mii_pollstat(mii);
VGE_UNLOCK(sc);
ifmr->ifm_active = mii->mii_media_active;
ifmr->ifm_status = mii->mii_media_status;
@ -2162,6 +2147,7 @@ vge_ioctl(ifp, command, data)
ifp->if_mtu = ifr->ifr_mtu;
break;
case SIOCSIFFLAGS:
VGE_LOCK(sc);
if (ifp->if_flags & IFF_UP) {
if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
ifp->if_flags & IFF_PROMISC &&
@ -2176,16 +2162,19 @@ vge_ioctl(ifp, command, data)
VGE_RXCTL_RX_PROMISC);
vge_setmulti(sc);
} else
vge_init(sc);
vge_init_locked(sc);
} else {
if (ifp->if_drv_flags & IFF_DRV_RUNNING)
vge_stop(sc);
}
sc->vge_if_flags = ifp->if_flags;
VGE_UNLOCK(sc);
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
VGE_LOCK(sc);
vge_setmulti(sc);
VGE_UNLOCK(sc);
break;
case SIOCGIFMEDIA:
case SIOCSIFMEDIA:
@ -2219,6 +2208,7 @@ vge_ioctl(ifp, command, data)
}
}
#endif /* DEVICE_POLLING */
VGE_LOCK(sc);
if ((mask & IFCAP_TXCSUM) != 0 &&
(ifp->if_capabilities & IFCAP_TXCSUM) != 0) {
ifp->if_capenable ^= IFCAP_TXCSUM;
@ -2230,6 +2220,7 @@ vge_ioctl(ifp, command, data)
if ((mask & IFCAP_RXCSUM) != 0 &&
(ifp->if_capabilities & IFCAP_RXCSUM) != 0)
ifp->if_capenable ^= IFCAP_RXCSUM;
VGE_UNLOCK(sc);
}
break;
default:
@ -2241,22 +2232,25 @@ vge_ioctl(ifp, command, data)
}
static void
vge_watchdog(ifp)
struct ifnet *ifp;
vge_watchdog(void *arg)
{
struct vge_softc *sc;
struct vge_softc *sc;
struct ifnet *ifp;
sc = ifp->if_softc;
VGE_LOCK(sc);
sc = arg;
VGE_LOCK_ASSERT(sc);
callout_reset(&sc->vge_watchdog, hz, vge_watchdog, sc);
if (sc->vge_timer == 0 || --sc->vge_timer > 0)
return;
ifp = sc->vge_ifp;
if_printf(ifp, "watchdog timeout\n");
ifp->if_oerrors++;
vge_txeof(sc);
vge_rxeof(sc);
vge_init(sc);
VGE_UNLOCK(sc);
vge_init_locked(sc);
return;
}
@ -2272,9 +2266,10 @@ vge_stop(sc)
register int i;
struct ifnet *ifp;
VGE_LOCK(sc);
VGE_LOCK_ASSERT(sc);
ifp = sc->vge_ifp;
ifp->if_timer = 0;
sc->vge_timer = 0;
callout_stop(&sc->vge_watchdog);
ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
@ -2312,8 +2307,6 @@ vge_stop(sc)
}
}
VGE_UNLOCK(sc);
return;
}
@ -2330,9 +2323,11 @@ vge_suspend(dev)
sc = device_get_softc(dev);
VGE_LOCK(sc);
vge_stop(sc);
sc->suspended = 1;
VGE_UNLOCK(sc);
return (0);
}
@ -2357,10 +2352,12 @@ vge_resume(dev)
pci_enable_io(dev, SYS_RES_MEMORY);
/* reinitialize interface if necessary */
VGE_LOCK(sc);
if (ifp->if_flags & IFF_UP)
vge_init(sc);
vge_init_locked(sc);
sc->suspended = 0;
VGE_UNLOCK(sc);
return (0);
}
@ -2377,7 +2374,9 @@ vge_shutdown(dev)
sc = device_get_softc(dev);
VGE_LOCK(sc);
vge_stop(sc);
VGE_UNLOCK(sc);
return (0);
}

3
sys/dev/vge/if_vgevar.h
View File

@ -111,8 +111,9 @@ struct vge_softc {
int vge_rx_consumed;
int vge_link;
int vge_camidx;
struct task vge_txtask;
struct mtx vge_mtx;
struct callout vge_watchdog;
int vge_timer;
struct mbuf *vge_head;
struct mbuf *vge_tail;