[Differential] [Closed] D5175: hyperv/hn: Add an option to always do transmission scheduling

[Phabricator]

This revision was automatically updated to reflect the committed changes.
Closed by commit rS295306: hyperv/hn: Add an option to always do transmission scheduling (authored by sephe).

CHANGED PRIOR TO COMMIT
  https://reviews.freebsd.org/D5175?vs=12968&id=13040#toc

REPOSITORY
  rS FreeBSD src repository

CHANGES SINCE LAST UPDATE
  https://reviews.freebsd.org/D5175?vs=12968&id=13040

REVISION DETAIL
  https://reviews.freebsd.org/D5175

AFFECTED FILES
  head/sys/dev/hyperv/netvsc/hv_net_vsc.h
  head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c

CHANGE DETAILS
  diff --git a/head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c b/head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
  --- a/head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
  +++ b/head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
  @@ -534,6 +534,10 @@
   	SYSCTL_ADD_INT(ctx, child, OID_AUTO, "direct_tx_size",
   	    CTLFLAG_RW, &sc->hn_direct_tx_size, 0,
   	    "Size of the packet for direct transmission");
  +	SYSCTL_ADD_INT(ctx, child, OID_AUTO, "sched_tx",
  +	    CTLFLAG_RW, &sc->hn_sched_tx, 0,
  +	    "Always schedule transmission "
  +	    "instead of doing direct transmission");
   
   	if (unit == 0) {
   		struct sysctl_ctx_list *dc_ctx;
  @@ -1602,26 +1606,31 @@
   static void
   hn_start(struct ifnet *ifp)
   {
  -	hn_softc_t *sc;
  +	struct hn_softc *sc = ifp->if_softc;
  +
  +	if (sc->hn_sched_tx)
  +		goto do_sched;
   
  -	sc = ifp->if_softc;
   	if (NV_TRYLOCK(sc)) {
   		int sched;
   
   		sched = hn_start_locked(ifp, sc->hn_direct_tx_size);
   		NV_UNLOCK(sc);
   		if (!sched)
   			return;
   	}
  +do_sched:
   	taskqueue_enqueue_fast(sc->hn_tx_taskq, &sc->hn_start_task);
   }
   
   static void
   hn_start_txeof(struct ifnet *ifp)
   {
  -	hn_softc_t *sc;
  +	struct hn_softc *sc = ifp->if_softc;
  +
  +	if (sc->hn_sched_tx)
  +		goto do_sched;
   
  -	sc = ifp->if_softc;
   	if (NV_TRYLOCK(sc)) {
   		int sched;
   
  @@ -1633,6 +1642,7 @@
   			    &sc->hn_start_task);
   		}
   	} else {
  +do_sched:
   		/*
   		 * Release the OACTIVE earlier, with the hope, that
   		 * others could catch up.  The task will clear the
  diff --git a/head/sys/dev/hyperv/netvsc/hv_net_vsc.h b/head/sys/dev/hyperv/netvsc/hv_net_vsc.h
  --- a/head/sys/dev/hyperv/netvsc/hv_net_vsc.h
  +++ b/head/sys/dev/hyperv/netvsc/hv_net_vsc.h
  @@ -1023,6 +1023,7 @@
   	int		hn_txdesc_avail;
   	int		hn_txeof;
   
  +	int		hn_sched_tx;
   	int		hn_direct_tx_size;
   	struct taskqueue *hn_tx_taskq;
   	struct task	hn_start_task;

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To: sepherosa_gmail.com, delphij, royger, decui_microsoft.com, howard0su_gmail.com, adrian, network, honzhan_microsoft.com
Cc: freebsd-virtualization-list, freebsd-net-list
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