Patchwork [v4,2/3] net: split eth_mac_addr for better error handling

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Submitter Amos Kong
Date Jan. 20, 2013, 2:43 a.m.
Message ID <1358649789-2338-3-git-send-email-akong@redhat.com>
Download mbox | patch
Permalink /patch/213904/
State Changes Requested
Delegated to: David Miller
Headers show

Comments

Amos Kong - Jan. 20, 2013, 2:43 a.m.
From: Stefan Hajnoczi <stefanha@gmail.com>

When we set mac address, software mac address in system and hardware mac
address all need to be updated. Current eth_mac_addr() doesn't allow
callers to implement error handling nicely.

This patch split eth_mac_addr() to prepare part and real commit part,
then we can prepare first, and try to change hardware address, then do
the real commit if hardware address is set successfully.

Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Amos Kong <akong@redhat.com>
---
 include/linux/etherdevice.h |  2 ++
 net/ethernet/eth.c          | 43 ++++++++++++++++++++++++++++++++++++-------
 2 files changed, 38 insertions(+), 7 deletions(-)
David Miller - Jan. 21, 2013, 4:14 a.m.
From: akong@redhat.com
Date: Sun, 20 Jan 2013 10:43:08 +0800

> From: Stefan Hajnoczi <stefanha@gmail.com>
> 
> When we set mac address, software mac address in system and hardware mac
> address all need to be updated. Current eth_mac_addr() doesn't allow
> callers to implement error handling nicely.
> 
> This patch split eth_mac_addr() to prepare part and real commit part,
> then we can prepare first, and try to change hardware address, then do
> the real commit if hardware address is set successfully.
> 
> Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
> Signed-off-by: Amos Kong <akong@redhat.com>

This patch doesn't apply to net-next.
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Stefan Hajnoczi - Jan. 21, 2013, 4:13 p.m.
On Sun, Jan 20, 2013 at 10:43:08AM +0800, akong@redhat.com wrote:
> From: Stefan Hajnoczi <stefanha@gmail.com>
> 
> When we set mac address, software mac address in system and hardware mac
> address all need to be updated. Current eth_mac_addr() doesn't allow
> callers to implement error handling nicely.
> 
> This patch split eth_mac_addr() to prepare part and real commit part,
> then we can prepare first, and try to change hardware address, then do
> the real commit if hardware address is set successfully.
> 
> Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
> Signed-off-by: Amos Kong <akong@redhat.com>
> ---
>  include/linux/etherdevice.h |  2 ++
>  net/ethernet/eth.c          | 43 ++++++++++++++++++++++++++++++++++++-------
>  2 files changed, 38 insertions(+), 7 deletions(-)

Feel free to make yourself author and put me just as Suggested-by:.  I
posted pseudo-code but didn't write the patch or test it, so it's fair
to say that credit goes to you. :)

Stefan
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Patch

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 243eea1..5cc6e0e 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -40,6 +40,8 @@  extern int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh,
 extern void eth_header_cache_update(struct hh_cache *hh,
 				    const struct net_device *dev,
 				    const unsigned char *haddr);
+extern int eth_prepare_mac_addr_change(struct net_device *dev, void *p);
+extern void eth_commit_mac_addr_change(struct net_device *dev, void *p);
 extern int eth_mac_addr(struct net_device *dev, void *p);
 extern int eth_change_mtu(struct net_device *dev, int new_mtu);
 extern int eth_validate_addr(struct net_device *dev);
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 4efad53..cce73eb 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -272,16 +272,11 @@  void eth_header_cache_update(struct hh_cache *hh,
 EXPORT_SYMBOL(eth_header_cache_update);
 
 /**
- * eth_mac_addr - set new Ethernet hardware address
+ * eth_prepare_mac_addr_change - prepare for mac change
  * @dev: network device
  * @p: socket address
- *
- * Change hardware address of device.
- *
- * This doesn't change hardware matching, so needs to be overridden
- * for most real devices.
  */
-int eth_mac_addr(struct net_device *dev, void *p)
+int eth_prepare_mac_addr_change(struct net_device *dev, void *p)
 {
 	struct sockaddr *addr = p;
 
@@ -289,9 +284,43 @@  int eth_mac_addr(struct net_device *dev, void *p)
 		return -EBUSY;
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;
+	return 0;
+}
+EXPORT_SYMBOL(eth_prepare_mac_addr_change);
+
+/**
+ * eth_commit_mac_addr_change - commit mac change
+ * @dev: network device
+ * @p: socket address
+ */
+void eth_commit_mac_addr_change(struct net_device *dev, void *p)
+{
+	struct sockaddr *addr = p;
+
 	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 	/* if device marked as NET_ADDR_RANDOM, reset it */
 	dev->addr_assign_type &= ~NET_ADDR_RANDOM;
+}
+EXPORT_SYMBOL(eth_commit_mac_addr_change);
+
+/**
+ * eth_mac_addr - set new Ethernet hardware address
+ * @dev: network device
+ * @p: socket address
+ *
+ * Change hardware address of device.
+ *
+ * This doesn't change hardware matching, so needs to be overridden
+ * for most real devices.
+ */
+int eth_mac_addr(struct net_device *dev, void *p)
+{
+	int ret;
+
+	ret = eth_prepare_mac_addr_change(dev, p);
+	if (ret < 0)
+		return ret;
+	eth_commit_mac_addr_change(dev, p);
 	return 0;
 }
 EXPORT_SYMBOL(eth_mac_addr);