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hyperv/hn: Add polling support

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MFC after:	1 week
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D8739
This commit is contained in:
Sepherosa Ziehau 2016-12-12 05:18:03 +00:00
parent b99113a1c1
commit 6c1204df36
2 changed files with 81 additions and 0 deletions
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79
sys/dev/hyperv/netvsc/if_hn.c
View File

@ -293,6 +293,7 @@ static int hn_txagg_size_sysctl(SYSCTL_HANDLER_ARGS);
static int hn_txagg_pkts_sysctl(SYSCTL_HANDLER_ARGS);
static int hn_txagg_pktmax_sysctl(SYSCTL_HANDLER_ARGS);
static int hn_txagg_align_sysctl(SYSCTL_HANDLER_ARGS);
static int hn_polling_sysctl(SYSCTL_HANDLER_ARGS);
static void hn_stop(struct hn_softc *);
static void hn_init_locked(struct hn_softc *);
@ -319,6 +320,8 @@ static void hn_resume_mgmt(struct hn_softc *);
static void hn_suspend_mgmt_taskfunc(void *, int);
static void hn_chan_drain(struct hn_softc *,
struct vmbus_channel *);
static void hn_polling(struct hn_softc *, u_int);
static void hn_chan_polling(struct vmbus_channel *, u_int);
static void hn_update_link_status(struct hn_softc *);
static void hn_change_network(struct hn_softc *);
@ -1117,6 +1120,10 @@ hn_attach(device_t dev)
hn_txagg_pkts_sysctl, "I",
"Packet transmission aggregation packets, "
"0 -- disable, -1 -- auto");
SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "polling",
CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_MPSAFE, sc, 0,
hn_polling_sysctl, "I",
"Polling frequency: [100,1000000], 0 disable polling");
/*
* Setup the ifmedia, which has been initialized earlier.
@ -2360,6 +2367,9 @@ hn_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
break;
}
/* Disable polling. */
hn_polling(sc, 0);
/*
* Suspend this interface before the synthetic parts
* are ripped.
@ -2405,6 +2415,13 @@ hn_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
*/
hn_resume(sc);
/*
* Re-enable polling if this interface is running and
* the polling is requested.
*/
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) && sc->hn_pollhz > 0)
hn_polling(sc, sc->hn_pollhz);
HN_UNLOCK(sc);
break;
@ -2531,6 +2548,9 @@ hn_stop(struct hn_softc *sc)
KASSERT(sc->hn_flags & HN_FLAG_SYNTH_ATTACHED,
("synthetic parts were not attached"));
/* Disable polling. */
hn_polling(sc, 0);
/* Clear RUNNING bit _before_ hn_suspend_data() */
atomic_clear_int(&ifp->if_drv_flags, IFF_DRV_RUNNING);
hn_suspend_data(sc);
@ -2568,6 +2588,10 @@ hn_init_locked(struct hn_softc *sc)
/* Everything is ready; unleash! */
atomic_set_int(&ifp->if_drv_flags, IFF_DRV_RUNNING);
/* Re-enable polling if requested. */
if (sc->hn_pollhz > 0)
hn_polling(sc, sc->hn_pollhz);
}
static void
@ -2875,6 +2899,61 @@ hn_txagg_align_sysctl(SYSCTL_HANDLER_ARGS)
return (sysctl_handle_int(oidp, &align, 0, req));
}
static void
hn_chan_polling(struct vmbus_channel *chan, u_int pollhz)
{
if (pollhz == 0)
vmbus_chan_poll_disable(chan);
else
vmbus_chan_poll_enable(chan, pollhz);
}
static void
hn_polling(struct hn_softc *sc, u_int pollhz)
{
int nsubch = sc->hn_rx_ring_inuse - 1;
HN_LOCK_ASSERT(sc);
if (nsubch > 0) {
struct vmbus_channel **subch;
int i;
subch = vmbus_subchan_get(sc->hn_prichan, nsubch);
for (i = 0; i < nsubch; ++i)
hn_chan_polling(subch[i], pollhz);
vmbus_subchan_rel(subch, nsubch);
}
hn_chan_polling(sc->hn_prichan, pollhz);
}
static int
hn_polling_sysctl(SYSCTL_HANDLER_ARGS)
{
struct hn_softc *sc = arg1;
int pollhz, error;
pollhz = sc->hn_pollhz;
error = sysctl_handle_int(oidp, &pollhz, 0, req);
if (error || req->newptr == NULL)
return (error);
if (pollhz != 0 &&
(pollhz < VMBUS_CHAN_POLLHZ_MIN || pollhz > VMBUS_CHAN_POLLHZ_MAX))
return (EINVAL);
HN_LOCK(sc);
if (sc->hn_pollhz != pollhz) {
sc->hn_pollhz = pollhz;
if ((sc->hn_ifp->if_drv_flags & IFF_DRV_RUNNING) &&
(sc->hn_flags & HN_FLAG_SYNTH_ATTACHED))
hn_polling(sc, sc->hn_pollhz);
}
HN_UNLOCK(sc);
return (0);
}
static int
hn_ndis_version_sysctl(SYSCTL_HANDLER_ARGS)
{

2
sys/dev/hyperv/netvsc/if_hnvar.h
View File

@ -212,6 +212,8 @@ struct hn_softc {
uint32_t hn_caps; /* HN_CAP_ */
uint32_t hn_flags; /* HN_FLAG_ */
u_int hn_pollhz;
void *hn_rxbuf;
uint32_t hn_rxbuf_gpadl;
struct hyperv_dma hn_rxbuf_dma;