Author: sephe Date: Thu Mar 10 02:37:47 2016 New Revision: 296595 URL: https://svnweb.freebsd.org/changeset/base/296595
Log: hyperv/hn: Make the # of TX rings configurable. Rename the tunables to avoid confusion. MFC after: 1 week Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5578 Modified: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c Modified: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c ============================================================================== --- head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c Thu Mar 10 02:28:01 2016 (r296594) +++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c Thu Mar 10 02:37:47 2016 (r296595) @@ -279,13 +279,14 @@ static int hn_use_if_start = 0; SYSCTL_INT(_hw_hn, OID_AUTO, use_if_start, CTLFLAG_RDTUN, &hn_use_if_start, 0, "Use if_start TX method"); -static int hn_ring_cnt = 1; -SYSCTL_INT(_hw_hn, OID_AUTO, ring_cnt, CTLFLAG_RDTUN, - &hn_ring_cnt, 0, "# of TX/RX rings to used"); - -static int hn_single_tx_ring = 1; -SYSCTL_INT(_hw_hn, OID_AUTO, single_tx_ring, CTLFLAG_RDTUN, - &hn_single_tx_ring, 0, "Use one TX ring"); +static int hn_chan_cnt = 1; +SYSCTL_INT(_hw_hn, OID_AUTO, chan_cnt, CTLFLAG_RDTUN, + &hn_chan_cnt, 0, + "# of channels to use; each channel has one RX ring and one TX ring"); + +static int hn_tx_ring_cnt = 1; +SYSCTL_INT(_hw_hn, OID_AUTO, tx_ring_cnt, CTLFLAG_RDTUN, + &hn_tx_ring_cnt, 0, "# of TX rings to use"); static u_int hn_cpu_index; @@ -439,24 +440,33 @@ netvsc_attach(device_t dev) ifp->if_softc = sc; if_initname(ifp, device_get_name(dev), device_get_unit(dev)); - ring_cnt = hn_ring_cnt; - if (ring_cnt <= 0 || ring_cnt >= mp_ncpus) + /* + * Figure out the # of RX rings (ring_cnt) and the # of TX rings + * to use (tx_ring_cnt). + * + * NOTE: + * The # of RX rings to use is same as the # of channels to use. + */ + ring_cnt = hn_chan_cnt; + if (ring_cnt <= 0 || ring_cnt > mp_ncpus) ring_cnt = mp_ncpus; - sc->hn_cpu = atomic_fetchadd_int(&hn_cpu_index, ring_cnt) % mp_ncpus; - tx_ring_cnt = ring_cnt; - if (hn_single_tx_ring || hn_use_if_start) { - /* - * - Explicitly asked to use single TX ring. - * - ifnet.if_start is used; ifnet.if_start only needs - * one TX ring. - */ + tx_ring_cnt = hn_tx_ring_cnt; + if (tx_ring_cnt <= 0 || tx_ring_cnt > ring_cnt) + tx_ring_cnt = ring_cnt; + if (hn_use_if_start) { + /* ifnet.if_start only needs one TX ring. */ tx_ring_cnt = 1; } + + /* + * Set the leader CPU for channels. + */ + sc->hn_cpu = atomic_fetchadd_int(&hn_cpu_index, ring_cnt) % mp_ncpus; + error = hn_create_tx_data(sc, tx_ring_cnt); if (error) goto failed; - hn_create_rx_data(sc, ring_cnt); /* @@ -505,12 +515,13 @@ netvsc_attach(device_t dev) error = hv_rf_on_device_add(device_ctx, &device_info, ring_cnt); if (error) goto failed; - KASSERT(sc->net_dev->num_channel <= ring_cnt, + KASSERT(sc->net_dev->num_channel > 0 && + sc->net_dev->num_channel <= sc->hn_rx_ring_inuse, ("invalid channel count %u, should be less than %d", - sc->net_dev->num_channel, ring_cnt)); + sc->net_dev->num_channel, sc->hn_rx_ring_inuse)); /* - * Set # of TX/RX rings that could be used according to + * Set the # of TX/RX rings that could be used according to * the # of channels that host offered. */ if (sc->hn_tx_ring_inuse > sc->net_dev->num_channel) _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
