Author: sephe Date: Tue Feb 23 09:20:33 2016 New Revision: 295916 URL: https://svnweb.freebsd.org/changeset/base/295916
Log: hyperv/hn: Factor out hn_send_pkt() from hn_start_locked() It will be shared w/ the upcoming ifnet.if_transmit method implementation. No functional change. MFC after: 1 week Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5385 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 Tue Feb 23 08:12:39 2016 (r295915) +++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c Tue Feb 23 09:20:33 2016 (r295916) @@ -905,6 +905,68 @@ done: } /* + * NOTE: + * If this function fails, then txd will be freed, but the mbuf + * associated w/ the txd will _not_ be freed. + */ +static int +hn_send_pkt(struct ifnet *ifp, struct hv_device *device_ctx, + struct hn_tx_ring *txr, struct hn_txdesc *txd) +{ + int error, send_failed = 0; + +again: + /* + * Make sure that txd is not freed before ETHER_BPF_MTAP. + */ + hn_txdesc_hold(txd); + error = hv_nv_on_send(device_ctx, &txd->netvsc_pkt); + if (!error) { + ETHER_BPF_MTAP(ifp, txd->m); + if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); + } + hn_txdesc_put(txr, txd); + + if (__predict_false(error)) { + int freed; + + /* + * This should "really rarely" happen. + * + * XXX Too many RX to be acked or too many sideband + * commands to run? Ask netvsc_channel_rollup() + * to kick start later. + */ + txr->hn_has_txeof = 1; + if (!send_failed) { + txr->hn_send_failed++; + send_failed = 1; + /* + * Try sending again after set hn_has_txeof; + * in case that we missed the last + * netvsc_channel_rollup(). + */ + goto again; + } + if_printf(ifp, "send failed\n"); + + /* + * Caller will perform further processing on the + * associated mbuf, so don't free it in hn_txdesc_put(); + * only unload it from the DMA map in hn_txdesc_put(), + * if it was loaded. + */ + txd->m = NULL; + freed = hn_txdesc_put(txr, txd); + KASSERT(freed != 0, + ("fail to free txd upon send error")); + + txr->hn_send_failed++; + } + return error; +} + +/* * Start a transmit of one or more packets */ static int @@ -922,9 +984,9 @@ hn_start_locked(struct hn_tx_ring *txr, return 0; while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { - int error, send_failed = 0; struct hn_txdesc *txd; struct mbuf *m_head; + int error; IFQ_DRV_DEQUEUE(&ifp->if_snd, m_head); if (m_head == NULL) @@ -953,52 +1015,10 @@ hn_start_locked(struct hn_tx_ring *txr, /* Both txd and m_head are freed */ continue; } -again: - /* - * Make sure that txd is not freed before ETHER_BPF_MTAP. - */ - hn_txdesc_hold(txd); - error = hv_nv_on_send(device_ctx, &txd->netvsc_pkt); - if (!error) { - ETHER_BPF_MTAP(ifp, m_head); - if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); - } - hn_txdesc_put(txr, txd); + error = hn_send_pkt(ifp, device_ctx, txr, txd); if (__predict_false(error)) { - int freed; - - /* - * This should "really rarely" happen. - * - * XXX Too many RX to be acked or too many sideband - * commands to run? Ask netvsc_channel_rollup() - * to kick start later. - */ - txr->hn_has_txeof = 1; - if (!send_failed) { - txr->hn_send_failed++; - send_failed = 1; - /* - * Try sending again after set hn_has_txeof; - * in case that we missed the last - * netvsc_channel_rollup(). - */ - goto again; - } - if_printf(ifp, "send failed\n"); - - /* - * This mbuf will be prepended, don't free it - * in hn_txdesc_put(); only unload it from the - * DMA map in hn_txdesc_put(), if it was loaded. - */ - txd->m = NULL; - freed = hn_txdesc_put(txr, txd); - KASSERT(freed != 0, - ("fail to free txd upon send error")); - - txr->hn_send_failed++; + /* txd is freed, but m_head is not */ IF_PREPEND(&ifp->if_snd, m_head); atomic_set_int(&ifp->if_drv_flags, IFF_DRV_OACTIVE); break; _______________________________________________ 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"
