netdev - [PATCH net-next 1/3] virtio_net: set multicast filter list to host

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Message-ID: <20131209161632.5ac96e5a@nehalam.linuxnetplumber.net>
Date:	Mon, 9 Dec 2013 16:16:32 -0800
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	David Miller <davem@...emloft.net>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: [PATCH net-next 1/3] virtio_net: set multicast filter list to host

The virtio_net driver never sends the multicast address list to
the host. This is because send command takes a pointer to scatter list
to send but only inserts that one entry into the outgoing scatter list.

This bug has been there since:
commit f565a7c259d71cc186753653d978c646d2354b36
Author: Alex Williamson <alex.williamson@...com>
Date:   Wed Feb 4 09:02:45 2009 +0000

    virtio_net: Add a MAC filter table

Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>

--- a/drivers/net/virtio_net.c	2013-12-09 16:12:03.897891975 -0800
+++ b/drivers/net/virtio_net.c	2013-12-09 16:12:36.353164803 -0800
@@ -893,7 +893,7 @@ static bool virtnet_send_command(struct
 	sg_init_one(&hdr, &ctrl, sizeof(ctrl));
 	sgs[out_num++] = &hdr;
 
-	if (out)
+	for (; out; out = sg_next(out))
 		sgs[out_num++] = out;
 	if (in)
 		sgs[out_num + in_num++] = in;
--
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