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From 4b542df026dfcc30802d300e56a99799f410ef50 Mon Sep 17 00:00:00 2001
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From: Amos Kong <akong@redhat.com>
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Date: Mon, 6 Jan 2014 05:29:20 +0100
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Subject: [PATCH 7/8] virtio-net: don't update mac_table in error state
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RH-Author: Amos Kong <akong@redhat.com>
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Message-id: <1388986160-19461-1-git-send-email-akong@redhat.com>
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Patchwork-id: 56495
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O-Subject: [RHEL-7.0 qemu-kvm PATCH] virtio-net: don't update mac_table in error state
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Bugzilla: 1048671
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RH-Acked-by: Xiao Wang <jasowang@redhat.com>
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RH-Acked-by: Vlad Yasevich <vyasevic@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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Bugzilla: 1048671
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Brew: https://brewweb.devel.redhat.com/taskinfo?taskID=6805382
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mac_table was always cleaned up first in handling
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VIRTIO_NET_CTRL_MAC_TABLE_SET command, and we din't recover
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mac_table content in error state, it's not correct.
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This patch makes all the changes in temporal variables,
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only update the real mac_table if everything is ok.
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We won't change mac_table in error state, so rxfilter
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notification isn't needed.
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This patch also fixed same problame in
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http://lists.nongnu.org/archive/html/qemu-devel/2013-11/msg01188.html
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(not merge)
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I will send patch for virtio spec to clarifying this change.
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Signed-off-by: Amos Kong <akong@redhat.com>
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Reviewed-by: Vlad Yasevich <vyasevic@redhat.com>
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Acked-by: Jason Wang <jasowang@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit cae2e5562cdaf3aafa1c4ec2d5f2b19af6c886dd)
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---
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hw/net/virtio-net.c | 35 ++++++++++++++++++++---------------
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1 files changed, 20 insertions(+), 15 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/net/virtio-net.c | 35 ++++++++++++++++++++---------------
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1 files changed, 20 insertions(+), 15 deletions(-)
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diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
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index 915aa70..21b126f 100644
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--- a/hw/net/virtio-net.c
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+++ b/hw/net/virtio-net.c
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@@ -548,11 +548,11 @@ static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
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return VIRTIO_NET_ERR;
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}
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- n->mac_table.in_use = 0;
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- n->mac_table.first_multi = 0;
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- n->mac_table.uni_overflow = 0;
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- n->mac_table.multi_overflow = 0;
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- memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
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+ int in_use = 0;
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+ int first_multi = 0;
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+ uint8_t uni_overflow = 0;
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+ uint8_t multi_overflow = 0;
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+ uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
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s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
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sizeof(mac_data.entries));
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@@ -567,19 +567,19 @@ static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
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}
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if (mac_data.entries <= MAC_TABLE_ENTRIES) {
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- s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs,
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+ s = iov_to_buf(iov, iov_cnt, 0, macs,
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mac_data.entries * ETH_ALEN);
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if (s != mac_data.entries * ETH_ALEN) {
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goto error;
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}
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- n->mac_table.in_use += mac_data.entries;
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+ in_use += mac_data.entries;
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} else {
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- n->mac_table.uni_overflow = 1;
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+ uni_overflow = 1;
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}
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iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN);
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- n->mac_table.first_multi = n->mac_table.in_use;
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+ first_multi = in_use;
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s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
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sizeof(mac_data.entries));
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@@ -594,24 +594,29 @@ static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
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goto error;
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}
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- if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
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- s = iov_to_buf(iov, iov_cnt, 0,
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- &n->mac_table.macs[n->mac_table.in_use * ETH_ALEN],
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+ if (in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
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+ s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN],
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mac_data.entries * ETH_ALEN);
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if (s != mac_data.entries * ETH_ALEN) {
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goto error;
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}
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- n->mac_table.in_use += mac_data.entries;
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+ in_use += mac_data.entries;
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} else {
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- n->mac_table.multi_overflow = 1;
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+ multi_overflow = 1;
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}
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+ n->mac_table.in_use = in_use;
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+ n->mac_table.first_multi = first_multi;
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+ n->mac_table.uni_overflow = uni_overflow;
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+ n->mac_table.multi_overflow = multi_overflow;
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+ memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN);
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+ g_free(macs);
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rxfilter_notify(nc);
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return VIRTIO_NET_OK;
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error:
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- rxfilter_notify(nc);
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+ g_free(macs);
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return VIRTIO_NET_ERR;
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}
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--
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1.7.1
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