netdev - Re: [PATCH net-next-2.6] bonding: move slave MTU handling from sysfs V2

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Date:	Wed, 19 May 2010 17:07:41 -0700
From:	Jay Vosburgh <fubar@...ibm.com>
To:	Jiri Pirko <jpirko@...hat.com>
cc:	netdev@...r.kernel.org, davem@...emloft.net,
	bonding-devel@...ts.sourceforge.net, monis@...taire.com
Subject: Re: [PATCH net-next-2.6] bonding: move slave MTU handling from sysfs V2

Jiri Pirko <jpirko@...hat.com> wrote:

>V1->V2: corrected res/ret use
>
>For some reason, MTU handling (storing, and restoring) is taking  place in
>bond_sysfs. The correct place for this code is in bond_enslave, bond_release.
>So move it there.

	In principle this looks ok, as do the other patches, but none of
them apply to net-next-2.6 for me except for the "optimize
tlb_get_least_loaded_slave" patch.  It looks like you left out a patch,
see below.

>Signed-off-by: Jiri Pirko <jpirko@...hat.com>
>---
> drivers/net/bonding/bond_main.c  |   15 ++++++++++++++-
> drivers/net/bonding/bond_sysfs.c |   22 ++--------------------
> 2 files changed, 16 insertions(+), 21 deletions(-)
>
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index 5e12462..2c3f9db 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -1533,6 +1533,14 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
> 	 */
> 	new_slave->original_flags = slave_dev->flags;
>
>+	/* Save slave's original mtu and then set it to match the bond */
>+	new_slave->original_mtu = slave_dev->mtu;
>+	res = dev_set_mtu(slave_dev, bond->dev->mtu);
>+	if (res) {
>+		pr_debug("Error %d calling dev_set_mtu\n", res);
>+		goto err_free;
>+	}
>+
> 	/*
> 	 * Save slave's original ("permanent") mac address for modes
> 	 * that need it, and for restoring it upon release, and then
>@@ -1550,7 +1558,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
> 		res = dev_set_mac_address(slave_dev, &addr);
> 		if (res) {
> 			pr_debug("Error %d calling set_mac_address\n", res);
>-			goto err_free;
>+			goto err_restore_mtu;
> 		}
> 	}
>
>@@ -1785,6 +1793,9 @@ err_restore_mac:
> 		dev_set_mac_address(slave_dev, &addr);
> 	}
>
>+err_restore_mtu:
>+	dev_set_mtu(slave_dev, new_slave->original_mtu);
>+
> err_free:
> 	kfree(new_slave);
>
>@@ -1969,6 +1980,8 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
> 		dev_set_mac_address(slave_dev, &addr);
> 	}
>
>+	dev_set_mtu(slave_dev, slave->original_mtu);
>+
> 	slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
> 				   IFF_SLAVE_INACTIVE | IFF_BONDING |
> 				   IFF_SLAVE_NEEDARP);
>diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
>index 392e291..29a7a8a 100644
>--- a/drivers/net/bonding/bond_sysfs.c
>+++ b/drivers/net/bonding/bond_sysfs.c
>@@ -220,7 +220,6 @@ static ssize_t bonding_store_slaves(struct device *d,
> 	char command[IFNAMSIZ + 1] = { 0, };
> 	char *ifname;
> 	int i, res, ret = count;
>-	u32 original_mtu;
> 	struct slave *slave;
> 	struct net_device *dev = NULL;
> 	struct bonding *bond = to_bond(d);

	This chunk doesn't apply to net-next-2.6 because your context
doesn't match; it looks like you've removed the variable "found" in your
"before" source.  On closer inspection, "found" isn't actually used
meaningfully, so I'm guessing you removed it in a prior patch but didn't
submit that patch.

	If that's the case, could you repost the whole series, with
sequence numbers?

	-J

>@@ -281,18 +280,7 @@ static ssize_t bonding_store_slaves(struct device *d,
> 			memcpy(bond->dev->dev_addr, dev->dev_addr,
> 			       dev->addr_len);
>
>-		/* Set the slave's MTU to match the bond */
>-		original_mtu = dev->mtu;
>-		res = dev_set_mtu(dev, bond->dev->mtu);
>-		if (res) {
>-			ret = res;
>-			goto out;
>-		}
>-
> 		res = bond_enslave(bond->dev, dev);
>-		bond_for_each_slave(bond, slave, i)
>-			if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0)
>-				slave->original_mtu = original_mtu;
> 		if (res)
> 			ret = res;
>
>@@ -301,23 +289,17 @@ static ssize_t bonding_store_slaves(struct device *d,
>
> 	if (command[0] == '-') {
> 		dev = NULL;
>-		original_mtu = 0;
> 		bond_for_each_slave(bond, slave, i)
> 			if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
> 				dev = slave->dev;
>-				original_mtu = slave->original_mtu;
> 				break;
> 			}
> 		if (dev) {
> 			pr_info("%s: Removing slave %s\n",
> 				bond->dev->name, dev->name);
>-				res = bond_release(bond->dev, dev);
>-			if (res) {
>+			res = bond_release(bond->dev, dev);
>+			if (res)
> 				ret = res;
>-				goto out;
>-			}
>-			/* set the slave MTU to the default */
>-			dev_set_mtu(dev, original_mtu);
> 		} else {
> 			pr_err("unable to remove non-existent slave %s for bond %s.\n",
> 			       ifname, bond->dev->name);
>-- 
>1.6.6.1

---
	-Jay Vosburgh, IBM Linux Technology Center, fubar@...ibm.com
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