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Date:      Tue, 19 Feb 2019 06:47:11 -0800 (PST)
From:      "Rodney W. Grimes" <freebsd@pdx.rh.CN85.dnsmgr.net>
To:        Vincenzo Maffione <v.maffione@gmail.com>
Cc:        rgrimes@freebsd.org, src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org
Subject:   Re: svn commit: r344272 - stable/11/sys/dev/vmware/vmxnet3
Message-ID:  <201902191447.x1JElBXa010843@pdx.rh.CN85.dnsmgr.net>
In-Reply-To: <CA%2B_eA9jno_dBNkXw-ihLGn682Qohkv4BG2LGRD1vyDNVOGynxA@mail.gmail.com>

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> Hi Rodney,
> 
> 
> Il giorno mar 19 feb 2019 alle ore 15:36 Rodney W. Grimes <
> freebsd@pdx.rh.cn85.dnsmgr.net> ha scritto:
> 
> > > Author: vmaffione
> > > Date: Tue Feb 19 10:07:48 2019
> > > New Revision: 344272
> > > URL: https://svnweb.freebsd.org/changeset/base/344272
> > >
> > > Log:
> > >   vmx(4): add native netmap support
> > >
> > >   This change adds native netmap support for the vmx(4) adapter
> > >   (vmxnet3). Native support comes for free in 12, since the driver has
> > been
> >                                                ^^^
> > This commit is to stable/11
> >
> 
> Yes, this commit is meant for stable/11. Since in head vmx(4) has been
> ported to iflib, netmap support form vmx(4)
> is already available there through iflib.
> In stable/11, on the other hand, vmx(4) is not using iflib, thus explicit
> netmap support is needed (hence this commit).
> 
> 
> >
> > >   ported to iflib. To make it minimally intrusive, the native support is
> > >   only enabled if vmxnet3.netmap_native is set at boot (e.g., in
> > loader.conf).
> > >
> > >   Tested on stable/11 running inside vmplayer.
> > >
> > >   Submitted by:       Giuseppe Lettieri <g.lettieri@iet.unipi.it>
> > >   Reviewed by:        vmaffione, bryanv
> > >   Sponsored by:       Sunny Valley Networks
> > >   Differential Revision:      https://reviews.freebsd.org/D19104
> >
> > Huh?  When did the vmx driver in stable/11 become iflib'ed?
> >
> 
> It didn't. The vmx driver has been ported to iflib in head.

Ok, the wording of this commit message was very confusing,
first it should of had a line:
Direct commit to stable/11 as this code no longer exists in head.

Second,
It would of been much clearer to not even mention the iflib
in head and stable/12.

Your first line and the one following sentance with out
any additional details other than the fact this is a direct
commit would of been clearer.

Log:
	vmx(4): add native netmap support

		This change adds native netmap support for the vmx(4) adapter
		(vmxnet3).

		This is a direct commit to stable/11,
		this code does not exist in ^/head due to iflib
		converstion of vmx(4).

> 
> Cheers,
>   Vincenzo
> 
> 
> >
> > >
> > > Added:
> > >   stable/11/sys/dev/vmware/vmxnet3/vmx_netmap.h   (contents, props
> > changed)
> > > Modified:
> > >   stable/11/sys/dev/vmware/vmxnet3/if_vmx.c
> > >
> > > Modified: stable/11/sys/dev/vmware/vmxnet3/if_vmx.c
> > >
> > ==============================================================================
> > > --- stable/11/sys/dev/vmware/vmxnet3/if_vmx.c Tue Feb 19 03:46:32 2019
> >       (r344271)
> > > +++ stable/11/sys/dev/vmware/vmxnet3/if_vmx.c Tue Feb 19 10:07:48 2019
> >       (r344272)
> > > @@ -239,6 +239,10 @@ typedef enum {
> > >
> > >  static void  vmxnet3_barrier(struct vmxnet3_softc *, vmxnet3_barrier_t);
> > >
> > > +#ifdef DEV_NETMAP
> > > +#include "vmx_netmap.h"
> > > +#endif
> > > +
> > >  /* Tunables. */
> > >  static int vmxnet3_mq_disable = 0;
> > >  TUNABLE_INT("hw.vmx.mq_disable", &vmxnet3_mq_disable);
> > > @@ -270,6 +274,9 @@ DRIVER_MODULE(vmx, pci, vmxnet3_driver,
> > vmxnet3_devcla
> > >
> > >  MODULE_DEPEND(vmx, pci, 1, 1, 1);
> > >  MODULE_DEPEND(vmx, ether, 1, 1, 1);
> > > +#ifdef DEV_NETMAP
> > > +MODULE_DEPEND(vmx, netmap, 1, 1, 1);
> > > +#endif
> > >
> > >  #define VMXNET3_VMWARE_VENDOR_ID     0x15AD
> > >  #define VMXNET3_VMWARE_DEVICE_ID     0x07B0
> > > @@ -347,6 +354,10 @@ vmxnet3_attach(device_t dev)
> > >       vmxnet3_start_taskqueue(sc);
> > >  #endif
> > >
> > > +#ifdef DEV_NETMAP
> > > +     vmxnet3_netmap_attach(sc);
> > > +#endif
> > > +
> > >  fail:
> > >       if (error)
> > >               vmxnet3_detach(dev);
> > > @@ -390,6 +401,10 @@ vmxnet3_detach(device_t dev)
> > >  #endif
> > >       vmxnet3_free_interrupts(sc);
> > >
> > > +#ifdef DEV_NETMAP
> > > +     netmap_detach(ifp);
> > > +#endif
> > > +
> > >       if (ifp != NULL) {
> > >               if_free(ifp);
> > >               sc->vmx_ifp = NULL;
> > > @@ -1846,6 +1861,11 @@ vmxnet3_txq_eof(struct vmxnet3_txqueue *txq)
> > >       txr = &txq->vxtxq_cmd_ring;
> > >       txc = &txq->vxtxq_comp_ring;
> > >
> > > +#ifdef DEV_NETMAP
> > > +     if (netmap_tx_irq(sc->vmx_ifp, txq - sc->vmx_txq) != NM_IRQ_PASS)
> > > +             return;
> > > +#endif
> > > +
> > >       VMXNET3_TXQ_LOCK_ASSERT(txq);
> > >
> > >       for (;;) {
> > > @@ -2111,6 +2131,15 @@ vmxnet3_rxq_eof(struct vmxnet3_rxqueue *rxq)
> > >       ifp = sc->vmx_ifp;
> > >       rxc = &rxq->vxrxq_comp_ring;
> > >
> > > +#ifdef DEV_NETMAP
> > > +     {
> > > +             int dummy;
> > > +             if (netmap_rx_irq(ifp, rxq - sc->vmx_rxq, &dummy) !=
> > > +                 NM_IRQ_PASS)
> > > +                     return;
> > > +     }
> > > +#endif
> > > +
> > >       VMXNET3_RXQ_LOCK_ASSERT(rxq);
> > >
> > >       if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
> > > @@ -2401,6 +2430,10 @@ vmxnet3_stop_rendezvous(struct vmxnet3_softc *sc)
> > >       struct vmxnet3_txqueue *txq;
> > >       int i;
> > >
> > > +#ifdef DEV_NETMAP
> > > +     netmap_disable_all_rings(sc->vmx_ifp);
> > > +#endif
> > > +
> > >       for (i = 0; i < sc->vmx_nrxqueues; i++) {
> > >               rxq = &sc->vmx_rxq[i];
> > >               VMXNET3_RXQ_LOCK(rxq);
> > > @@ -2454,6 +2487,10 @@ vmxnet3_txinit(struct vmxnet3_softc *sc, struct
> > vmxnet
> > >       bzero(txr->vxtxr_txd,
> > >           txr->vxtxr_ndesc * sizeof(struct vmxnet3_txdesc));
> > >
> > > +#ifdef DEV_NETMAP
> > > +     vmxnet3_netmap_txq_init(sc, txq);
> > > +#endif
> > > +
> > >       txc = &txq->vxtxq_comp_ring;
> > >       txc->vxcr_next = 0;
> > >       txc->vxcr_gen = VMXNET3_INIT_GEN;
> > > @@ -2468,6 +2505,10 @@ vmxnet3_rxinit(struct vmxnet3_softc *sc, struct
> > vmxnet
> > >       struct vmxnet3_rxring *rxr;
> > >       struct vmxnet3_comp_ring *rxc;
> > >       int i, populate, idx, frame_size, error;
> > > +#ifdef DEV_NETMAP
> > > +     struct netmap_adapter *na;
> > > +     struct netmap_slot *slot;
> > > +#endif
> > >
> > >       ifp = sc->vmx_ifp;
> > >       frame_size = ETHER_ALIGN + sizeof(struct ether_vlan_header) +
> > > @@ -2498,12 +2539,24 @@ vmxnet3_rxinit(struct vmxnet3_softc *sc, struct
> > vmxnet
> > >       else
> > >               populate = VMXNET3_RXRINGS_PERQ;
> > >
> > > +#ifdef DEV_NETMAP
> > > +     na = NA(ifp);
> > > +     slot = netmap_reset(na, NR_RX, rxq - sc->vmx_rxq, 0);
> > > +#endif
> > > +
> > >       for (i = 0; i < populate; i++) {
> > >               rxr = &rxq->vxrxq_cmd_ring[i];
> > >               rxr->vxrxr_fill = 0;
> > >               rxr->vxrxr_gen = VMXNET3_INIT_GEN;
> > >               bzero(rxr->vxrxr_rxd,
> > >                   rxr->vxrxr_ndesc * sizeof(struct vmxnet3_rxdesc));
> > > +#ifdef DEV_NETMAP
> > > +             if (slot != NULL) {
> > > +                     vmxnet3_netmap_rxq_init(sc, rxq, rxr, slot);
> > > +                     i = populate;
> > > +                     break;
> > > +             }
> > > +#endif
> > >
> > >               for (idx = 0; idx < rxr->vxrxr_ndesc; idx++) {
> > >                       error = vmxnet3_newbuf(sc, rxr);
> > > @@ -2625,6 +2678,10 @@ vmxnet3_init_locked(struct vmxnet3_softc *sc)
> > >
> > >       ifp->if_drv_flags |= IFF_DRV_RUNNING;
> > >       vmxnet3_link_status(sc);
> > > +
> > > +#ifdef DEV_NETMAP
> > > +     netmap_enable_all_rings(ifp);
> > > +#endif
> > >
> > >       vmxnet3_enable_all_intrs(sc);
> > >       callout_reset(&sc->vmx_tick, hz, vmxnet3_tick, sc);
> > >
> > > Added: stable/11/sys/dev/vmware/vmxnet3/vmx_netmap.h
> > >
> > ==============================================================================
> > > --- /dev/null 00:00:00 1970   (empty, because file is newly added)
> > > +++ stable/11/sys/dev/vmware/vmxnet3/vmx_netmap.h     Tue Feb 19
> > 10:07:48 2019        (r344272)
> > > @@ -0,0 +1,376 @@
> > > +/*
> > > + * Copyright (C) 2019 Universita` di Pisa.
> > > + * Sponsored by Sunny Valley Networks.
> > > + *
> > > + * Redistribution and use in source and binary forms, with or without
> > > + * modification, are permitted provided that the following conditions
> > > + * are met:
> > > + * 1. Redistributions of source code must retain the above copyright
> > > + *    notice, this list of conditions and the following disclaimer.
> > > + * 2. Redistributions in binary form must reproduce the above copyright
> > > + *    notice, this list of conditions and the following disclaimer in
> > the
> > > + *    documentation and/or other materials provided with the
> > distribution.
> > > + *
> > > + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
> > AND
> > > + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
> > > + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
> > PURPOSE
> > > + * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
> > LIABLE
> > > + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
> > CONSEQUENTIAL
> > > + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
> > GOODS
> > > + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
> > > + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
> > STRICT
> > > + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
> > ANY WAY
> > > + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
> > OF
> > > + * SUCH DAMAGE.
> > > + */
> > > +
> > > +/* $FreeBSD$ */
> > > +
> > > +#include <net/netmap.h>
> > > +#include <dev/netmap/netmap_kern.h>
> > > +
> > > +static int
> > > +vmxnet3_netmap_reg(struct netmap_adapter *na, int onoff)
> > > +{
> > > +     struct ifnet *ifp = na->ifp;
> > > +     struct vmxnet3_softc *sc = ifp->if_softc;
> > > +
> > > +     VMXNET3_CORE_LOCK(sc);
> > > +     vmxnet3_stop(sc);
> > > +     if (onoff) {
> > > +             nm_set_native_flags(na);
> > > +     } else {
> > > +             nm_clear_native_flags(na);
> > > +     }
> > > +     vmxnet3_init_locked(sc);
> > > +     VMXNET3_CORE_UNLOCK(sc);
> > > +     return 0;
> > > +}
> > > +
> > > +static void
> > > +vmxnet3_netmap_rxq_init(struct vmxnet3_softc *sc, struct
> > vmxnet3_rxqueue *rxq,
> > > +             struct vmxnet3_rxring *rxr, struct netmap_slot *slot)
> > > +{
> > > +     struct ifnet *ifp = sc->vmx_ifp;
> > > +     struct netmap_adapter *na = NA(ifp);
> > > +     struct vmxnet3_rxdesc *rxd;
> > > +     int q, i;
> > > +
> > > +     q = rxq - sc->vmx_rxq;
> > > +
> > > +     for (i = 0; ; i++) {
> > > +             int idx = rxr->vxrxr_fill;
> > > +             int si = netmap_idx_n2k(na->rx_rings[q], idx);
> > > +             struct vmxnet3_rxbuf  *rxb = &rxr->vxrxr_rxbuf[idx];
> > > +             uint64_t paddr;
> > > +             void *addr;
> > > +
> > > +             addr = PNMB(na, slot +  si, &paddr);
> > > +             netmap_load_map(na, rxr->vxrxr_rxtag, rxb->vrxb_dmamap,
> > addr);
> > > +
> > > +             rxd = &rxr->vxrxr_rxd[idx];
> > > +             rxd->addr = paddr;
> > > +             rxd->len = NETMAP_BUF_SIZE(na);
> > > +             rxd->gen = rxr->vxrxr_gen ^ 1;
> > > +             rxd->btype = VMXNET3_BTYPE_HEAD;
> > > +             nm_prdis("%d: addr %lx len %u btype %u gen %u",
> > > +                     idx, rxd->addr, rxd->len, rxd->btype, rxd->gen);
> > > +
> > > +             if (i == rxr->vxrxr_ndesc -1)
> > > +                     break;
> > > +
> > > +             rxd->gen ^= 1;
> > > +             vmxnet3_rxr_increment_fill(rxr);
> > > +     }
> > > +}
> > > +
> > > +static void
> > > +vmxnet3_netmap_txq_init(struct vmxnet3_softc *sc, struct
> > vmxnet3_txqueue *txq)
> > > +{
> > > +     struct ifnet *ifp = sc->vmx_ifp;
> > > +     struct netmap_adapter *na;
> > > +     struct netmap_slot *slot;
> > > +     struct vmxnet3_txring *txr;
> > > +     int i, gen, q;
> > > +
> > > +     q = txq - sc->vmx_txq;
> > > +
> > > +     na = NA(ifp);
> > > +
> > > +     slot = netmap_reset(na, NR_TX, q, 0);
> > > +     if (slot == NULL)
> > > +             return;
> > > +
> > > +     txr = &txq->vxtxq_cmd_ring;
> > > +     gen = txr->vxtxr_gen ^ 1;
> > > +
> > > +     for (i = 0; i < txr->vxtxr_ndesc; i++) {
> > > +             int si = netmap_idx_n2k(na->tx_rings[q], i);
> > > +             struct vmxnet3_txdesc *txd = &txr->vxtxr_txd[i];
> > > +             uint64_t paddr;
> > > +             void *addr;
> > > +
> > > +             addr = PNMB(na, slot +  si, &paddr);
> > > +
> > > +             txd->addr = paddr;
> > > +             txd->len = 0;
> > > +             txd->gen = gen;
> > > +             txd->dtype = 0;
> > > +             txd->offload_mode = VMXNET3_OM_NONE;
> > > +             txd->offload_pos = 0;
> > > +             txd->hlen = 0;
> > > +             txd->eop = 0;
> > > +             txd->compreq = 0;
> > > +             txd->vtag_mode = 0;
> > > +             txd->vtag = 0;
> > > +
> > > +             netmap_load_map(na, txr->vxtxr_txtag,
> > > +                             txr->vxtxr_txbuf[i].vtxb_dmamap, addr);
> > > +     }
> > > +}
> > > +
> > > +static int
> > > +vmxnet3_netmap_txsync(struct netmap_kring *kring, int flags)
> > > +{
> > > +     struct netmap_adapter *na = kring->na;
> > > +     struct ifnet *ifp = na->ifp;
> > > +     struct netmap_ring *ring = kring->ring;
> > > +     u_int nm_i;
> > > +     u_int nic_i;
> > > +     u_int n;
> > > +     u_int const lim = kring->nkr_num_slots - 1;
> > > +     u_int const head = kring->rhead;
> > > +
> > > +     /*
> > > +      * interrupts on every tx packet are expensive so request
> > > +      * them every half ring, or where NS_REPORT is set
> > > +      */
> > > +     u_int report_frequency = kring->nkr_num_slots >> 1;
> > > +     /* device specific */
> > > +     struct vmxnet3_softc *sc = ifp->if_softc;
> > > +     struct vmxnet3_txqueue *txq = &sc->vmx_txq[kring->ring_id];
> > > +     struct vmxnet3_txring *txr = &txq->vxtxq_cmd_ring;
> > > +     struct vmxnet3_comp_ring *txc = &txq->vxtxq_comp_ring;
> > > +     struct vmxnet3_txcompdesc *txcd = txc->vxcr_u.txcd;
> > > +     int gen = txr->vxtxr_gen;
> > > +
> > > +     /* no need to dma-sync the ring; memory barriers are sufficient */
> > > +
> > > +     nm_i = kring->nr_hwcur;
> > > +     if (nm_i != head) {
> > > +             nic_i = netmap_idx_k2n(kring, nm_i);
> > > +             for (n = 0; nm_i != head; n++) {
> > > +                     struct netmap_slot *slot = &ring->slot[nm_i];
> > > +                     u_int len = slot->len;
> > > +                     uint64_t paddr;
> > > +                     void *addr = PNMB(na, slot, &paddr);
> > > +                     int compreq = !!(slot->flags & NS_REPORT ||
> > > +                             nic_i == 0 || nic_i == report_frequency);
> > > +
> > > +                     /* device specific */
> > > +                     struct vmxnet3_txdesc *curr =
> > &txr->vxtxr_txd[nic_i];
> > > +                     struct vmxnet3_txbuf *txbuf =
> > &txr->vxtxr_txbuf[nic_i];
> > > +
> > > +                     NM_CHECK_ADDR_LEN(na, addr, len);
> > > +
> > > +                     /* fill the slot in the NIC ring */
> > > +                     curr->len = len;
> > > +                     curr->eop = 1; /* NS_MOREFRAG not supported */
> > > +                     curr->compreq = compreq;
> > > +
> > > +                     if (slot->flags & NS_BUF_CHANGED) {
> > > +                             curr->addr = paddr;
> > > +                             netmap_reload_map(na, txr->vxtxr_txtag,
> > > +                                             txbuf->vtxb_dmamap, addr);
> > > +                     }
> > > +                     slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
> > > +
> > > +                     /* make sure changes to the buffer are synced */
> > > +                     bus_dmamap_sync(txr->vxtxr_txtag,
> > txbuf->vtxb_dmamap,
> > > +                                     BUS_DMASYNC_PREWRITE);
> > > +
> > > +                     /* pass ownership */
> > > +                     vmxnet3_barrier(sc, VMXNET3_BARRIER_WR);
> > > +                     curr->gen = gen;
> > > +
> > > +                     nm_i = nm_next(nm_i, lim);
> > > +                     nic_i++;
> > > +                     if (unlikely(nic_i == lim + 1)) {
> > > +                             nic_i = 0;
> > > +                             gen = txr->vxtxr_gen ^= 1;
> > > +                     }
> > > +             }
> > > +
> > > +             vmxnet3_write_bar0(sc, VMXNET3_BAR0_TXH(txq->vxtxq_id),
> > nic_i);
> > > +     }
> > > +     kring->nr_hwcur = nm_i;
> > > +
> > > +     /* reclaim completed packets */
> > > +     for (;;) {
> > > +             u_int sop;
> > > +             struct vmxnet3_txbuf *txb;
> > > +
> > > +             txcd = &txc->vxcr_u.txcd[txc->vxcr_next];
> > > +             if (txcd->gen != txc->vxcr_gen)
> > > +                     break;
> > > +
> > > +             vmxnet3_barrier(sc, VMXNET3_BARRIER_RD);
> > > +
> > > +             if (++txc->vxcr_next == txc->vxcr_ndesc) {
> > > +                     txc->vxcr_next = 0;
> > > +                     txc->vxcr_gen ^= 1;
> > > +             }
> > > +
> > > +             sop = txr->vxtxr_next;
> > > +             txb = &txr->vxtxr_txbuf[sop];
> > > +
> > > +             bus_dmamap_sync(txr->vxtxr_txtag, txb->vtxb_dmamap,
> > > +                BUS_DMASYNC_POSTWRITE);
> > > +
> > > +             txr->vxtxr_next = (txcd->eop_idx + 1) % txr->vxtxr_ndesc;
> > > +     }
> > > +     kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, txr->vxtxr_next),
> > lim);
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +static int
> > > +vmxnet3_netmap_rxsync(struct netmap_kring *kring, int flags)
> > > +{
> > > +     struct netmap_adapter *na = kring->na;
> > > +     struct netmap_ring *ring = kring->ring;
> > > +     u_int nm_i;
> > > +     u_int nic_i;
> > > +     u_int const lim = kring->nkr_num_slots - 1;
> > > +     u_int const head = kring->rhead;
> > > +     int force_update = (flags & NAF_FORCE_READ);
> > > +
> > > +     struct ifnet *ifp = na->ifp;
> > > +     struct vmxnet3_softc *sc = ifp->if_softc;
> > > +     struct vmxnet3_rxqueue *rxq = &sc->vmx_rxq[kring->ring_id];
> > > +     struct vmxnet3_rxring *rxr;
> > > +     struct vmxnet3_comp_ring *rxc;
> > > +
> > > +     if (head > lim)
> > > +             return netmap_ring_reinit(kring);
> > > +
> > > +     rxr = &rxq->vxrxq_cmd_ring[0];
> > > +
> > > +     /* no need to dma-sync the ring; memory barriers are sufficient */
> > > +
> > > +     /* first part: import newly received packets */
> > > +     if (netmap_no_pendintr || force_update) {
> > > +             rxc = &rxq->vxrxq_comp_ring;
> > > +             nm_i = kring->nr_hwtail;
> > > +             nic_i = netmap_idx_k2n(kring, nm_i);
> > > +             for (;;) {
> > > +                     struct vmxnet3_rxcompdesc *rxcd;
> > > +                     struct vmxnet3_rxbuf *rxb;
> > > +
> > > +                     rxcd = &rxc->vxcr_u.rxcd[rxc->vxcr_next];
> > > +
> > > +                     if (rxcd->gen != rxc->vxcr_gen)
> > > +                             break;
> > > +                     vmxnet3_barrier(sc, VMXNET3_BARRIER_RD);
> > > +
> > > +                     while (__predict_false(rxcd->rxd_idx != nic_i)) {
> > > +                             nm_prlim(1, "%u skipped! idx %u", nic_i,
> > rxcd->rxd_idx);
> > > +                             /* to shelter the application from this  we
> > > +                              * would need to rotate the kernel-owned
> > > +                              * portion of the netmap and nic rings. We
> > > +                              * return len=0 for now and hope for the
> > best.
> > > +                              */
> > > +                             ring->slot[nm_i].len = 0;
> > > +                             nic_i = nm_next(nm_i, lim);
> > > +                             nm_i = nm_next(nm_i, lim);
> > > +                     }
> > > +
> > > +                     rxb = &rxr->vxrxr_rxbuf[nic_i];
> > > +
> > > +                     ring->slot[nm_i].len = rxcd->len;
> > > +                     ring->slot[nm_i].flags = 0;
> > > +
> > > +                     bus_dmamap_sync(rxr->vxrxr_rxtag, rxb->vrxb_dmamap,
> > > +                                     BUS_DMASYNC_POSTREAD);
> > > +
> > > +                     nic_i = nm_next(nm_i, lim);
> > > +                     nm_i = nm_next(nm_i, lim);
> > > +
> > > +                     rxc->vxcr_next++;
> > > +                     if (__predict_false(rxc->vxcr_next ==
> > rxc->vxcr_ndesc)) {
> > > +                             rxc->vxcr_next = 0;
> > > +                             rxc->vxcr_gen ^= 1;
> > > +                     }
> > > +             }
> > > +             kring->nr_hwtail = nm_i;
> > > +     }
> > > +     /* second part: skip past packets that userspace has released */
> > > +     nm_i = kring->nr_hwcur;
> > > +     if (nm_i != head) {
> > > +             nic_i = netmap_idx_k2n(kring, nm_i);
> > > +             while (nm_i != head) {
> > > +                     struct netmap_slot *slot = &ring->slot[nm_i];
> > > +                     struct vmxnet3_rxdesc *rxd_fill;
> > > +                     struct vmxnet3_rxbuf *rxbuf;
> > > +
> > > +                     if (slot->flags & NS_BUF_CHANGED) {
> > > +                             uint64_t paddr;
> > > +                             void *addr = PNMB(na, slot, &paddr);
> > > +                             struct vmxnet3_rxdesc *rxd =
> > &rxr->vxrxr_rxd[nic_i];
> > > +
> > > +
> > > +                             if (addr == NETMAP_BUF_BASE(na))
> > > +                                     return netmap_ring_reinit(kring);
> > > +
> > > +                             rxd->addr = paddr;
> > > +                             rxbuf = &rxr->vxrxr_rxbuf[nic_i];
> > > +                             netmap_reload_map(na, rxr->vxrxr_rxtag,
> > > +                                             rxbuf->vrxb_dmamap, addr);
> > > +                             slot->flags &= ~NS_BUF_CHANGED;
> > > +                             vmxnet3_barrier(sc, VMXNET3_BARRIER_WR);
> > > +                     }
> > > +
> > > +                     rxd_fill = &rxr->vxrxr_rxd[rxr->vxrxr_fill];
> > > +                     rxbuf = &rxr->vxrxr_rxbuf[rxr->vxrxr_fill];
> > > +
> > > +                     bus_dmamap_sync(rxr->vxrxr_rxtag,
> > rxbuf->vrxb_dmamap,
> > > +                                     BUS_DMASYNC_PREREAD);
> > > +
> > > +                     rxd_fill->gen = rxr->vxrxr_gen;
> > > +                     vmxnet3_rxr_increment_fill(rxr);
> > > +
> > > +                     nm_i = nm_next(nm_i, lim);
> > > +                     nic_i = nm_next(nic_i, lim);
> > > +             }
> > > +             kring->nr_hwcur = head;
> > > +             if (__predict_false(rxq->vxrxq_rs->update_rxhead)) {
> > > +                     vmxnet3_write_bar0(sc,
> > > +                             VMXNET3_BAR0_RXH1(kring->ring_id),
> > rxr->vxrxr_fill);
> > > +             }
> > > +     }
> > > +     return 0;
> > > +}
> > > +
> > > +static void
> > > +vmxnet3_netmap_attach(struct vmxnet3_softc *sc)
> > > +{
> > > +     struct netmap_adapter na;
> > > +     int enable = 0;
> > > +
> > > +     if (getenv_int("vmxnet3.netmap_native", &enable) < 0 || !enable) {
> > > +             return;
> > > +     }
> > > +
> > > +     bzero(&na, sizeof(na));
> > > +
> > > +     na.ifp = sc->vmx_ifp;
> > > +     na.na_flags = NAF_BDG_MAYSLEEP;
> > > +     na.num_tx_desc = sc->vmx_ntxdescs;
> > > +     na.num_rx_desc = sc->vmx_nrxdescs;
> > > +     na.num_tx_rings = sc->vmx_ntxqueues;
> > > +     na.num_rx_rings = sc->vmx_nrxqueues;
> > > +     na.nm_register = vmxnet3_netmap_reg;
> > > +     na.nm_txsync = vmxnet3_netmap_txsync;
> > > +     na.nm_rxsync = vmxnet3_netmap_rxsync;
> > > +     netmap_attach(&na);
> > > +}
> > >
> > >
> >
> > --
> > Rod Grimes
> > rgrimes@freebsd.org
> >
> 
> 
> -- 
> Vincenzo

-- 
Rod Grimes                                                 rgrimes@freebsd.org



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