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virtio_net: validate ethtool port setting and explain the user validation

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We should validate the port setting that we got from the user and check
if it's what we've set it to (PORT_OTHER), also add explanation that
ignoring advertising is good as long as we don't have autonegotiation.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2016-02-07 21:52:24 +01:00 committed by David S. Miller
parent e02564ee33
commit 0cf3ace9e7
1 changed files with 4 additions and 2 deletions
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6
drivers/net/virtio_net.c
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@ -1386,11 +1386,13 @@ static bool virtnet_validate_ethtool_cmd(const struct ethtool_cmd *cmd)
struct ethtool_cmd diff1 = *cmd;
struct ethtool_cmd diff2 = {};
/* advertising and cmd are usually set, ignore port because we set it */
/* cmd is always set so we need to clear it, validate the port type
* and also without autonegotiation we can ignore advertising
*/
ethtool_cmd_speed_set(&diff1, 0);
diff2.port = PORT_OTHER;
diff1.advertising = 0;
diff1.duplex = 0;
diff1.port = 0;
diff1.cmd = 0;
return !memcmp(&diff1, &diff2, sizeof(diff1));