Date: Sat, 25 Jan 2014 19:58:53 +0000 (UTC) From: Bryan Venteicher <bryanv@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r261168 - head/sys/dev/virtio/network Message-ID: <201401251958.s0PJwr9w071837@svn.freebsd.org>
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Author: bryanv Date: Sat Jan 25 19:58:53 2014 New Revision: 261168 URL: http://svnweb.freebsd.org/changeset/base/261168 Log: Check for a full virtqueue in the multiqueue transmit path With most hosts, we'll negotiate indirect descriptors, so all we need is one available descriptor to transmit a frame. Modified: head/sys/dev/virtio/network/if_vtnet.c Modified: head/sys/dev/virtio/network/if_vtnet.c ============================================================================== --- head/sys/dev/virtio/network/if_vtnet.c Sat Jan 25 19:57:30 2014 (r261167) +++ head/sys/dev/virtio/network/if_vtnet.c Sat Jan 25 19:58:53 2014 (r261168) @@ -2243,6 +2243,12 @@ vtnet_txq_mq_start_locked(struct vtnet_t vtnet_txq_eof(txq); while ((m = drbr_peek(ifp, br)) != NULL) { + if (virtqueue_full(vq)) { + drbr_putback(ifp, br, m); + error = ENOBUFS; + break; + } + error = vtnet_txq_encap(txq, &m); if (error) { if (m != NULL)
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