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Date: Wed, 30 Apr 2008 22:54:18 +0100
From: Ben Hutchings <bhutchings@...arflare.com>
To: David Miller <davem@...emloft.net>
Cc: Kieran Mansley <kmansley@...arflare.com>,
Stephen Hemminger <shemminger@...tta.com>,
netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] Disable forwarding of LRO skbs
Add dev_disable_lro() function.
Change br_add_if() and all functions that enable IPv4 and IPv6 forwarding
to call dev_disable_lro() on the affected devices.
Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7c1d446..d7e8f1f 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -866,6 +866,7 @@ extern struct net_device *__dev_get_by_name(struct net *net, const char *name);
extern int dev_alloc_name(struct net_device *dev, const char *name);
extern int dev_open(struct net_device *dev);
extern int dev_close(struct net_device *dev);
+extern void dev_disable_lro(struct net_device *dev);
extern int dev_queue_xmit(struct sk_buff *skb);
extern int register_netdevice(struct net_device *dev);
extern void unregister_netdevice(struct net_device *dev);
diff --git a/net/core/dev.c b/net/core/dev.c
index e1df1ab..62cca32 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -90,6 +90,7 @@
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
#include <linux/notifier.h>
#include <linux/skbuff.h>
#include <net/net_namespace.h>
@@ -1108,6 +1109,29 @@ int dev_close(struct net_device *dev)
}
+/**
+ * dev_disable_lro - disable Large Receive Offload on a device
+ * @dev: device
+ *
+ * Disable Large Receive Offload (LRO) on a net device. Must be
+ * called under RTNL. This is needed if received packets may be
+ * forwarded to another interface.
+ */
+void dev_disable_lro(struct net_device *dev)
+{
+ if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
+ dev->ethtool_ops->set_flags) {
+ u32 flags = dev->ethtool_ops->get_flags(dev);
+ if (flags & ETH_FLAG_LRO) {
+ flags &= ~ETH_FLAG_LRO;
+ dev->ethtool_ops->set_flags(dev, flags);
+ }
+ }
+ WARN_ON(dev->features & NETIF_F_LRO);
+}
+EXPORT_SYMBOL(dev_disable_lro);
+
+
static int dev_boot_phase = 1;
/*
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 298e0f4..1bd6631 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -387,6 +387,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
goto err2;
rcu_assign_pointer(dev->br_port, p);
+ dev_disable_lro(dev);
dev_set_promiscuity(dev, 1);
list_add_rcu(&p->list, &br->port_list);
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 6848e47..f88d395 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -171,6 +171,8 @@ static struct in_device *inetdev_init(struct net_device *dev)
in_dev->dev = dev;
if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
goto out_kfree;
+ if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
+ dev_disable_lro(dev);
/* Reference in_dev->dev */
dev_hold(dev);
/* Account for reference dev->ip_ptr (below) */
@@ -1250,6 +1252,8 @@ static void inet_forward_change(struct net *net)
read_lock(&dev_base_lock);
for_each_netdev(net, dev) {
struct in_device *in_dev;
+ if (on)
+ dev_disable_lro(dev);
rcu_read_lock();
in_dev = __in_dev_get_rcu(dev);
if (in_dev)
@@ -1257,8 +1261,6 @@ static void inet_forward_change(struct net *net)
rcu_read_unlock();
}
read_unlock(&dev_base_lock);
-
- rt_cache_flush(0);
}
static int devinet_conf_proc(ctl_table *ctl, int write,
@@ -1344,10 +1346,19 @@ static int devinet_sysctl_forward(ctl_table *ctl, int write,
if (write && *valp != val) {
struct net *net = ctl->extra2;
- if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING))
- inet_forward_change(net);
- else if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING))
+ if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
+ rtnl_lock();
+ if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
+ inet_forward_change(net);
+ } else if (*valp) {
+ struct ipv4_devconf *cnf = ctl->extra1;
+ struct in_device *idev =
+ container_of(cnf, struct in_device, cnf);
+ dev_disable_lro(idev->dev);
+ }
+ rtnl_unlock();
rt_cache_flush(0);
+ }
}
return ret;
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 8a0fd40..5be6874 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -344,6 +344,8 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
kfree(ndev);
return NULL;
}
+ if (ndev->cnf.forwarding)
+ dev_disable_lro(dev);
/* We refer to the device */
dev_hold(dev);
@@ -438,6 +440,8 @@ static void dev_forward_change(struct inet6_dev *idev)
if (!idev)
return;
dev = idev->dev;
+ if (idev->cnf.forwarding)
+ dev_disable_lro(dev);
if (dev && (dev->flags & IFF_MULTICAST)) {
if (idev->cnf.forwarding)
ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
@@ -483,12 +487,14 @@ static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
if (p == &net->ipv6.devconf_dflt->forwarding)
return;
+ rtnl_lock();
if (p == &net->ipv6.devconf_all->forwarding) {
__s32 newf = net->ipv6.devconf_all->forwarding;
net->ipv6.devconf_dflt->forwarding = newf;
addrconf_forward_change(net, newf);
} else if ((!*p) ^ (!old))
dev_forward_change((struct inet6_dev *)table->extra1);
+ rtnl_unlock();
if (*p)
rt6_purge_dflt_routers(net);
--
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
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