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hyperv/hn: Allow users to configure ifq or bufring depth.

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MFC after:	1 week
Sponsored by:	Microsoft OSTC
This commit is contained in:
Sepherosa Ziehau 2016-04-25 03:48:28 +00:00
parent a99d821068
commit 4e0c3dc461
1 changed files with 23 additions and 3 deletions
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26
sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
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@ -291,6 +291,10 @@ static int hn_tx_ring_cnt = 0;
SYSCTL_INT(_hw_hn, OID_AUTO, tx_ring_cnt, CTLFLAG_RDTUN,
&hn_tx_ring_cnt, 0, "# of TX rings to use");
static int hn_tx_swq_depth = 0;
SYSCTL_INT(_hw_hn, OID_AUTO, tx_swq_depth, CTLFLAG_RDTUN,
&hn_tx_swq_depth, 0, "Depth of IFQ or BUFRING");
static u_int hn_cpu_index;
/*
@ -347,6 +351,16 @@ hn_set_lro_lenlim(struct hn_softc *sc, int lenlim)
}
#endif
static int
hn_get_txswq_depth(const struct hn_tx_ring *txr)
{
KASSERT(txr->hn_txdesc_cnt > 0, ("tx ring is not setup yet"));
if (hn_tx_swq_depth < txr->hn_txdesc_cnt)
return txr->hn_txdesc_cnt;
return hn_tx_swq_depth;
}
static int
hn_ifmedia_upd(struct ifnet *ifp __unused)
{
@ -501,9 +515,11 @@ netvsc_attach(device_t dev)
/* needed by hv_rf_on_device_add() code */
ifp->if_mtu = ETHERMTU;
if (hn_use_if_start) {
int qdepth = hn_get_txswq_depth(&sc->hn_tx_ring[0]);
ifp->if_start = hn_start;
IFQ_SET_MAXLEN(&ifp->if_snd, 512);
ifp->if_snd.ifq_drv_maxlen = 511;
IFQ_SET_MAXLEN(&ifp->if_snd, qdepth);
ifp->if_snd.ifq_drv_maxlen = qdepth - 1;
IFQ_SET_READY(&ifp->if_snd);
} else {
ifp->if_transmit = hn_transmit;
@ -2285,10 +2301,14 @@ hn_create_tx_ring(struct hn_softc *sc, int id)
TASK_INIT(&txr->hn_tx_task, 0, hn_start_taskfunc, txr);
TASK_INIT(&txr->hn_txeof_task, 0, hn_start_txeof_taskfunc, txr);
} else {
int br_depth;
txr->hn_txeof = hn_xmit_txeof;
TASK_INIT(&txr->hn_tx_task, 0, hn_xmit_taskfunc, txr);
TASK_INIT(&txr->hn_txeof_task, 0, hn_xmit_txeof_taskfunc, txr);
txr->hn_mbuf_br = buf_ring_alloc(txr->hn_txdesc_cnt, M_NETVSC,
br_depth = hn_get_txswq_depth(txr);
txr->hn_mbuf_br = buf_ring_alloc(br_depth, M_NETVSC,
M_WAITOK, &txr->hn_tx_lock);
}