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virtio_net: validate ethtool port setting and explain the user validation 

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>
hifive-unleashed-5.1
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));