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Hyper-V: hn: add switch to turn on and off RSC

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Currently RSC offloading is enabled by default.
With this new change rsc will be disabled by default.
By using sysctl we can enable and disable it.

Reviewed by:	whu
Signed-off-by:	Souradeep Chakrabarti <schakrabarti@microsoft.com>
Fixes:		a491581f3f Enable vSwitch RSC support in hn netvsc driver
MFC after:	1 week
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D34507
This commit is contained in:
Wei Hu 2022-03-15 07:56:38 +00:00
parent 734782a781
commit 80c3eb7bc6
4 changed files with 44 additions and 1 deletions
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9
sys/dev/hyperv/netvsc/hn_rndis.c
View File

@ -579,6 +579,12 @@ hn_rndis_set(struct hn_softc *sc, uint32_t oid, const void *data, size_t dlen)
return (error);
}
int
hn_rndis_reconf_offload(struct hn_softc *sc, int mtu)
{
return(hn_rndis_conf_offload(sc, mtu));
}
static int
hn_rndis_conf_offload(struct hn_softc *sc, int mtu)
{
@ -725,7 +731,8 @@ hn_rndis_conf_offload(struct hn_softc *sc, int mtu)
/* RSC offload */
if (hwcaps.ndis_hdr.ndis_rev >= NDIS_OFFLOAD_PARAMS_REV_3) {
if (hwcaps.ndis_rsc.ndis_ip4 && hwcaps.ndis_rsc.ndis_ip6) {
if (hwcaps.ndis_rsc.ndis_ip4 && hwcaps.ndis_rsc.ndis_ip6 &&
sc->hn_rsc_ctrl) {
params.ndis_rsc_ip4 = NDIS_OFFLOAD_RSC_ON;
params.ndis_rsc_ip6 = NDIS_OFFLOAD_RSC_ON;
} else {

1
sys/dev/hyperv/netvsc/hn_rndis.h
View File

@ -46,5 +46,6 @@ int hn_rndis_get_mtu(struct hn_softc *sc, uint32_t *mtu);
int hn_rndis_set_rxfilter(struct hn_softc *sc, uint32_t filter);
void hn_rndis_rx_ctrl(struct hn_softc *sc, const void *data,
int dlen);
int hn_rndis_reconf_offload(struct hn_softc *sc, int mtu);
#endif /* !_HN_RNDIS_H_ */

30
sys/dev/hyperv/netvsc/if_hn.c
View File

@ -454,6 +454,8 @@ static void hn_start_txeof(struct hn_tx_ring *);
static void hn_start_txeof_taskfunc(void *, int);
#endif
static int hn_rsc_sysctl(SYSCTL_HANDLER_ARGS);
SYSCTL_NODE(_hw, OID_AUTO, hn, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL,
"Hyper-V network interface");
@ -2370,6 +2372,10 @@ hn_attach(device_t dev)
"Accurate BPF for transparent VF");
}
SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rsc_switch",
CTLTYPE_UINT | CTLFLAG_RW, sc, 0, hn_rsc_sysctl, "A",
"switch to rsc");
/*
* Setup the ifmedia, which has been initialized earlier.
*/
@ -4567,6 +4573,30 @@ hn_rxfilter_sysctl(SYSCTL_HANDLER_ARGS)
return sysctl_handle_string(oidp, filter_str, sizeof(filter_str), req);
}
static int
hn_rsc_sysctl(SYSCTL_HANDLER_ARGS)
{
struct hn_softc *sc = arg1;
uint32_t mtu;
int error;
HN_LOCK(sc);
error = hn_rndis_get_mtu(sc, &mtu);
if (error) {
if_printf(sc->hn_ifp, "failed to get mtu\n");
goto back;
}
error = SYSCTL_OUT(req, &(sc->hn_rsc_ctrl), sizeof(sc->hn_rsc_ctrl));
if (error || req->newptr == NULL)
goto back;
error = SYSCTL_IN(req, &(sc->hn_rsc_ctrl), sizeof(sc->hn_rsc_ctrl));
if (error)
goto back;
error = hn_rndis_reconf_offload(sc, mtu);
back:
HN_UNLOCK(sc);
return (error);
}
#ifndef RSS
static int

5
sys/dev/hyperv/netvsc/if_hnvar.h
View File

@ -282,6 +282,11 @@ struct hn_softc {
u_int hn_saved_tsomax;
u_int hn_saved_tsosegcnt;
u_int hn_saved_tsosegsz;
/*
* RSC switch, default off
*/
u_int hn_rsc_ctrl;
};
#define HN_FLAG_RXBUF_CONNECTED 0x0001