[patch net-next] virtio_net: allow to change mac when iface is running

Subsystems: networking drivers, the rest, virtio net driver

STALE5168d

4 messages, 2 authors, 2012-06-28 · open the first message on its own page

[patch net-next] virtio_net: allow to change mac when iface is running

From: Jiri Pirko <hidden>
Date: 2012-06-27 15:27:52

Signed-off-by: Jiri Pirko <redacted>
---
 drivers/net/virtio_net.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index f18149a..36a16d5 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -679,11 +679,12 @@ static int virtnet_set_mac_address(struct net_device *dev, void *p)
 {
 	struct virtnet_info *vi = netdev_priv(dev);
 	struct virtio_device *vdev = vi->vdev;
-	int ret;
+	struct sockaddr *addr = p;
 
-	ret = eth_mac_addr(dev, p);
-	if (ret)
-		return ret;
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
+	dev->addr_assign_type &= ~NET_ADDR_RANDOM;
 
 	if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
 		vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
-- 
1.7.10.4

Re: [patch net-next] virtio_net: allow to change mac when iface is running

From: David Miller <davem@davemloft.net>
Date: 2012-06-28 04:30:46

From: Jiri Pirko <redacted>
Date: Wed, 27 Jun 2012 17:27:46 +0200
Signed-off-by: Jiri Pirko <redacted>
Applied, but this seriously makes eth_mac_addr() completely useless.

Technically, every eth_mac_addr() user in a software/virtual device
should behave the way virtio_net does now.

It therefore probably makes sense to add a boolean arg which when true
elides the netif_running() check then fixup and audit every caller.

Re: [patch net-next] virtio_net: allow to change mac when iface is running

From: Jiri Pirko <hidden>
Date: 2012-06-28 06:35:25

Thu, Jun 28, 2012 at 06:30:46AM CEST, davem@davemloft.net wrote:
From: Jiri Pirko <redacted>
Date: Wed, 27 Jun 2012 17:27:46 +0200
quoted
Signed-off-by: Jiri Pirko <redacted>
Applied, but this seriously makes eth_mac_addr() completely useless.

Technically, every eth_mac_addr() user in a software/virtual device
should behave the way virtio_net does now.
I guess to. But for some HW devices eth_mac_addr() is needed (when they
does not support "life" mac change")
It therefore probably makes sense to add a boolean arg which when true
elides the netif_running() check then fixup and audit every caller.
I was thinking about this. Maybe probably __eth_mac_addr() which does
not have netif_running() check and eth_mac_addr() calling
netif_running() check and __eth_mac_addr() after that.

What do you think?

Jirka

Re: [patch net-next] virtio_net: allow to change mac when iface is running

From: David Miller <davem@davemloft.net>
Date: 2012-06-28 08:30:24

From: Jiri Pirko <redacted>
Date: Thu, 28 Jun 2012 08:35:25 +0200
Thu, Jun 28, 2012 at 06:30:46AM CEST, davem@davemloft.net wrote:
quoted
It therefore probably makes sense to add a boolean arg which when true
elides the netif_running() check then fixup and audit every caller.
I was thinking about this. Maybe probably __eth_mac_addr() which does
not have netif_running() check and eth_mac_addr() calling
netif_running() check and __eth_mac_addr() after that.

What do you think?
Yes, sounds good.
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