hyperv/hn: Implement ifnet.if_transmit method
It will be turned on by default later. MFC after: 1 week Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5415
This commit is contained in:
Sepherosa Ziehau
parent
e283644b87
commit
ea134429d0
@ -1034,6 +1034,9 @@ struct hn_tx_ring {
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struct task hn_tx_task;
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struct task hn_txeof_task;
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struct buf_ring *hn_mbuf_br;
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int hn_oactive;
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struct mtx hn_tx_lock;
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struct hn_softc *hn_sc;
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@ -272,6 +272,10 @@ static int hn_bind_tx_taskq = -1;
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SYSCTL_INT(_hw_hn, OID_AUTO, bind_tx_taskq, CTLFLAG_RDTUN,
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&hn_bind_tx_taskq, 0, "Bind TX taskqueue to the specified cpu");
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static int hn_use_if_start = 1;
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SYSCTL_INT(_hw_hn, OID_AUTO, use_if_start, CTLFLAG_RDTUN,
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&hn_use_if_start, 0, "Use if_start TX method");
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/*
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* Forward declarations
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*/
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@ -305,6 +309,13 @@ static void hn_create_rx_data(struct hn_softc *sc);
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static void hn_destroy_rx_data(struct hn_softc *sc);
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static void hn_set_tx_chimney_size(struct hn_softc *, int);
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static int hn_transmit(struct ifnet *, struct mbuf *);
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static void hn_xmit_qflush(struct ifnet *);
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static int hn_xmit(struct hn_tx_ring *, int);
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static void hn_xmit_txeof(struct hn_tx_ring *);
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static void hn_xmit_taskfunc(void *, int);
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static void hn_xmit_txeof_taskfunc(void *, int);
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static int
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hn_ifmedia_upd(struct ifnet *ifp __unused)
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{
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@ -422,13 +433,18 @@ netvsc_attach(device_t dev)
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ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
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ifp->if_ioctl = hn_ioctl;
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ifp->if_start = hn_start;
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ifp->if_init = hn_ifinit;
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/* needed by hv_rf_on_device_add() code */
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ifp->if_mtu = ETHERMTU;
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IFQ_SET_MAXLEN(&ifp->if_snd, 512);
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ifp->if_snd.ifq_drv_maxlen = 511;
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IFQ_SET_READY(&ifp->if_snd);
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if (hn_use_if_start) {
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ifp->if_start = hn_start;
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IFQ_SET_MAXLEN(&ifp->if_snd, 512);
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ifp->if_snd.ifq_drv_maxlen = 511;
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IFQ_SET_READY(&ifp->if_snd);
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} else {
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ifp->if_transmit = hn_transmit;
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ifp->if_qflush = hn_xmit_qflush;
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}
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ifmedia_init(&sc->hn_media, 0, hn_ifmedia_upd, hn_ifmedia_sts);
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ifmedia_add(&sc->hn_media, IFM_ETHER | IFM_AUTO, 0, NULL);
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@ -924,6 +940,12 @@ hn_send_pkt(struct ifnet *ifp, struct hv_device *device_ctx,
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if (!error) {
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ETHER_BPF_MTAP(ifp, txd->m);
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if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
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if (!hn_use_if_start) {
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if_inc_counter(ifp, IFCOUNTER_OBYTES,
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txd->m->m_pkthdr.len);
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if (txd->m->m_flags & M_MCAST)
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if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
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}
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}
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hn_txdesc_put(txr, txd);
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@ -976,6 +998,8 @@ hn_start_locked(struct hn_tx_ring *txr, int len)
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struct ifnet *ifp = sc->hn_ifp;
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struct hv_device *device_ctx = vmbus_get_devctx(sc->hn_dev);
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KASSERT(hn_use_if_start,
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("hn_start_locked is called, when if_start is disabled"));
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KASSERT(txr == &sc->hn_tx_ring[0], ("not the first TX ring"));
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mtx_assert(&txr->hn_tx_lock, MA_OWNED);
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@ -1530,7 +1554,7 @@ static void
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hn_stop(hn_softc_t *sc)
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{
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struct ifnet *ifp;
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int ret;
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int ret, i;
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struct hv_device *device_ctx = vmbus_get_devctx(sc->hn_dev);
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ifp = sc->hn_ifp;
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@ -1540,6 +1564,9 @@ hn_stop(hn_softc_t *sc)
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atomic_clear_int(&ifp->if_drv_flags,
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(IFF_DRV_RUNNING | IFF_DRV_OACTIVE));
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for (i = 0; i < sc->hn_tx_ring_cnt; ++i)
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sc->hn_tx_ring[i].hn_oactive = 0;
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if_link_state_change(ifp, LINK_STATE_DOWN);
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sc->hn_initdone = 0;
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@ -1612,7 +1639,7 @@ hn_ifinit_locked(hn_softc_t *sc)
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{
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struct ifnet *ifp;
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struct hv_device *device_ctx = vmbus_get_devctx(sc->hn_dev);
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int ret;
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int ret, i;
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ifp = sc->hn_ifp;
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@ -1628,7 +1655,11 @@ hn_ifinit_locked(hn_softc_t *sc)
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} else {
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sc->hn_initdone = 1;
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}
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atomic_clear_int(&ifp->if_drv_flags, IFF_DRV_OACTIVE);
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for (i = 0; i < sc->hn_tx_ring_cnt; ++i)
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sc->hn_tx_ring[i].hn_oactive = 0;
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atomic_set_int(&ifp->if_drv_flags, IFF_DRV_RUNNING);
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if_link_state_change(ifp, LINK_STATE_UP);
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}
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@ -2115,8 +2146,18 @@ hn_create_tx_ring(struct hn_softc *sc, int id)
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#endif
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txr->hn_tx_taskq = sc->hn_tx_taskq;
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TASK_INIT(&txr->hn_tx_task, 0, hn_start_taskfunc, txr);
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TASK_INIT(&txr->hn_txeof_task, 0, hn_start_txeof_taskfunc, txr);
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if (hn_use_if_start) {
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txr->hn_txeof = hn_start_txeof;
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TASK_INIT(&txr->hn_tx_task, 0, hn_start_taskfunc, txr);
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TASK_INIT(&txr->hn_txeof_task, 0, hn_start_txeof_taskfunc, txr);
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} else {
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txr->hn_txeof = hn_xmit_txeof;
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TASK_INIT(&txr->hn_tx_task, 0, hn_xmit_taskfunc, txr);
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TASK_INIT(&txr->hn_txeof_task, 0, hn_xmit_txeof_taskfunc, txr);
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txr->hn_mbuf_br = buf_ring_alloc(txr->hn_txdesc_cnt, M_NETVSC,
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M_WAITOK, &txr->hn_tx_lock);
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}
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txr->hn_direct_tx_size = hn_direct_tx_size;
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if (hv_vmbus_protocal_version >= HV_VMBUS_VERSION_WIN8_1)
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@ -2130,8 +2171,6 @@ hn_create_tx_ring(struct hn_softc *sc, int id)
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*/
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txr->hn_sched_tx = 1;
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txr->hn_txeof = hn_start_txeof; /* TODO: if_transmit */
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parent_dtag = bus_get_dma_tag(sc->hn_dev);
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/* DMA tag for RNDIS messages. */
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@ -2248,6 +2287,11 @@ hn_create_tx_ring(struct hn_softc *sc, int id)
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SYSCTL_ADD_INT(ctx, child, OID_AUTO, "txdesc_avail",
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CTLFLAG_RD, &txr->hn_txdesc_avail, 0,
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"# of available TX descs");
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if (!hn_use_if_start) {
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SYSCTL_ADD_INT(ctx, child, OID_AUTO, "oactive",
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CTLFLAG_RD, &txr->hn_oactive, 0,
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"over active");
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}
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}
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}
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@ -2298,6 +2342,9 @@ hn_destroy_tx_ring(struct hn_tx_ring *txr)
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free(txr->hn_txdesc, M_NETVSC);
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txr->hn_txdesc = NULL;
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if (txr->hn_mbuf_br != NULL)
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buf_ring_free(txr->hn_mbuf_br, M_NETVSC);
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#ifndef HN_USE_TXDESC_BUFRING
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mtx_destroy(&txr->hn_txlist_spin);
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#endif
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@ -2311,7 +2358,12 @@ hn_create_tx_data(struct hn_softc *sc)
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struct sysctl_ctx_list *ctx;
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int i;
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sc->hn_tx_ring_cnt = 1; /* TODO: vRSS */
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if (hn_use_if_start) {
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/* ifnet.if_start only needs one TX ring */
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sc->hn_tx_ring_cnt = 1;
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} else {
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sc->hn_tx_ring_cnt = 1; /* TODO: vRSS */
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}
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sc->hn_tx_ring = malloc(sizeof(struct hn_tx_ring) * sc->hn_tx_ring_cnt,
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M_NETVSC, M_WAITOK | M_ZERO);
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@ -2436,6 +2488,166 @@ hn_stop_tx_tasks(struct hn_softc *sc)
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}
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}
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static int
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hn_xmit(struct hn_tx_ring *txr, int len)
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{
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struct hn_softc *sc = txr->hn_sc;
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struct ifnet *ifp = sc->hn_ifp;
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struct hv_device *device_ctx = vmbus_get_devctx(sc->hn_dev);
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struct mbuf *m_head;
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mtx_assert(&txr->hn_tx_lock, MA_OWNED);
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KASSERT(hn_use_if_start == 0,
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("hn_xmit is called, when if_start is enabled"));
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if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || txr->hn_oactive)
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return 0;
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while ((m_head = drbr_peek(ifp, txr->hn_mbuf_br)) != NULL) {
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struct hn_txdesc *txd;
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int error;
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if (len > 0 && m_head->m_pkthdr.len > len) {
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/*
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* This sending could be time consuming; let callers
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* dispatch this packet sending (and sending of any
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* following up packets) to tx taskqueue.
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*/
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drbr_putback(ifp, txr->hn_mbuf_br, m_head);
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return 1;
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}
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txd = hn_txdesc_get(txr);
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if (txd == NULL) {
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txr->hn_no_txdescs++;
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drbr_putback(ifp, txr->hn_mbuf_br, m_head);
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txr->hn_oactive = 1;
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break;
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}
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error = hn_encap(txr, txd, &m_head);
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if (error) {
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/* Both txd and m_head are freed; discard */
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drbr_advance(ifp, txr->hn_mbuf_br);
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continue;
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}
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error = hn_send_pkt(ifp, device_ctx, txr, txd);
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if (__predict_false(error)) {
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/* txd is freed, but m_head is not */
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drbr_putback(ifp, txr->hn_mbuf_br, m_head);
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txr->hn_oactive = 1;
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break;
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}
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/* Sent */
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drbr_advance(ifp, txr->hn_mbuf_br);
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}
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return 0;
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}
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static int
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hn_transmit(struct ifnet *ifp, struct mbuf *m)
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{
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struct hn_softc *sc = ifp->if_softc;
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struct hn_tx_ring *txr;
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int error;
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/* TODO: vRSS, TX ring selection */
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txr = &sc->hn_tx_ring[0];
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error = drbr_enqueue(ifp, txr->hn_mbuf_br, m);
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if (error)
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return error;
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if (txr->hn_oactive)
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return 0;
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if (txr->hn_sched_tx)
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goto do_sched;
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if (mtx_trylock(&txr->hn_tx_lock)) {
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int sched;
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sched = hn_xmit(txr, txr->hn_direct_tx_size);
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mtx_unlock(&txr->hn_tx_lock);
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if (!sched)
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return 0;
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}
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do_sched:
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taskqueue_enqueue(txr->hn_tx_taskq, &txr->hn_tx_task);
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return 0;
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}
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static void
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hn_xmit_qflush(struct ifnet *ifp)
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{
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struct hn_softc *sc = ifp->if_softc;
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int i;
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for (i = 0; i < sc->hn_tx_ring_cnt; ++i) {
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struct hn_tx_ring *txr = &sc->hn_tx_ring[i];
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struct mbuf *m;
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mtx_lock(&txr->hn_tx_lock);
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while ((m = buf_ring_dequeue_sc(txr->hn_mbuf_br)) != NULL)
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m_freem(m);
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mtx_unlock(&txr->hn_tx_lock);
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}
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if_qflush(ifp);
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}
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static void
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hn_xmit_txeof(struct hn_tx_ring *txr)
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{
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if (txr->hn_sched_tx)
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goto do_sched;
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if (mtx_trylock(&txr->hn_tx_lock)) {
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int sched;
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txr->hn_oactive = 0;
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sched = hn_xmit(txr, txr->hn_direct_tx_size);
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mtx_unlock(&txr->hn_tx_lock);
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if (sched) {
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taskqueue_enqueue(txr->hn_tx_taskq,
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&txr->hn_tx_task);
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}
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} else {
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do_sched:
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/*
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* Release the oactive earlier, with the hope, that
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* others could catch up. The task will clear the
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* oactive again with the hn_tx_lock to avoid possible
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* races.
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*/
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txr->hn_oactive = 0;
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taskqueue_enqueue(txr->hn_tx_taskq, &txr->hn_txeof_task);
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}
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}
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static void
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hn_xmit_taskfunc(void *xtxr, int pending __unused)
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{
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struct hn_tx_ring *txr = xtxr;
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mtx_lock(&txr->hn_tx_lock);
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hn_xmit(txr, 0);
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mtx_unlock(&txr->hn_tx_lock);
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}
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static void
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hn_xmit_txeof_taskfunc(void *xtxr, int pending __unused)
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{
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struct hn_tx_ring *txr = xtxr;
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mtx_lock(&txr->hn_tx_lock);
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txr->hn_oactive = 0;
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hn_xmit(txr, 0);
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mtx_unlock(&txr->hn_tx_lock);
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}
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static void
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hn_tx_taskq_create(void *arg __unused)
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{
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