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Date: Tue, 6 Dec 2011 20:04:24 -0500
From: Benjamin LaHaise <bcrl@...ck.org>
To: "David S. Miller" <davem@...emloft.net>
Cc: netdev@...r.kernel.org
Subject: [PATCH] add netpoll support for 802.1q vlans
Add netpoll support to 802.1q vlan devices. Based on the netpoll support
in the bridging code. Tested on a forced_eth device with netconsole.
Signed-off-by: Benjamin LaHaise <bcrl@...ck.org>
diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
index 9fd45f3..df562b5 100644
--- a/net/8021q/vlan.h
+++ b/net/8021q/vlan.h
@@ -40,6 +40,8 @@ struct vlan_pcpu_stats {
u32 tx_dropped;
};
+struct netpoll;
+
/**
* struct vlan_dev_info - VLAN private device data
* @nr_ingress_mappings: number of ingress priority mappings
@@ -67,6 +69,9 @@ struct vlan_dev_info {
struct proc_dir_entry *dent;
struct vlan_pcpu_stats __percpu *vlan_pcpu_stats;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ struct netpoll *netpoll;
+#endif
};
static inline struct vlan_dev_info *vlan_dev_info(const struct net_device *dev)
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 2b5fcde..98417ff 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -33,6 +33,7 @@
#include "vlan.h"
#include "vlanproc.h"
#include <linux/if_vlan.h>
+#include <linux/netpoll.h>
/*
* Rebuild the Ethernet MAC header. This is called after an ARP
@@ -158,6 +159,8 @@ static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
skb_set_dev(skb, vlan_dev_info(dev)->real_dev);
len = skb->len;
+ if (netpoll_tx_running(dev))
+ return skb->dev->netdev_ops->ndo_start_xmit(skb, skb->dev);
ret = dev_queue_xmit(skb);
if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
@@ -660,6 +663,60 @@ static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, st
return stats;
}
+#ifdef CONFIG_NET_POLL_CONTROLLER
+void vlan_dev_poll_controller(struct net_device *dev)
+{
+ struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
+
+ if (real_dev->netdev_ops->ndo_poll_controller)
+ real_dev->netdev_ops->ndo_poll_controller(real_dev);
+}
+
+int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
+{
+ struct vlan_dev_info *info = vlan_dev_info(dev);
+ struct net_device *real_dev = info->real_dev;
+ struct netpoll *netpoll;
+ int err = 0;
+
+ netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
+ err = -ENOMEM;
+ if (!netpoll)
+ goto out;
+
+ netpoll->dev = real_dev;
+ strlcpy(netpoll->dev_name, real_dev->name, IFNAMSIZ);
+
+ err = __netpoll_setup(netpoll);
+ if (err) {
+ kfree(netpoll);
+ goto out;
+ }
+
+ info->netpoll = netpoll;
+
+out:
+ return err;
+}
+
+void vlan_dev_netpoll_cleanup(struct net_device *dev)
+{
+ struct vlan_dev_info *info = vlan_dev_info(dev);
+ struct netpoll *netpoll = info->netpoll;
+
+ if (!netpoll)
+ return;
+
+ info->netpoll = NULL;
+
+ /* Wait for transmitting packets to finish before freeing. */
+ synchronize_rcu_bh();
+
+ __netpoll_cleanup(netpoll);
+ kfree(netpoll);
+}
+#endif /* CONFIG_NET_POLL_CONTROLLER */
+
static const struct ethtool_ops vlan_ethtool_ops = {
.get_settings = vlan_ethtool_get_settings,
.get_drvinfo = vlan_ethtool_get_drvinfo,
@@ -688,6 +745,11 @@ static const struct net_device_ops vlan_netdev_ops = {
.ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
.ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
#endif
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = vlan_dev_poll_controller,
+ .ndo_netpoll_setup = vlan_dev_netpoll_setup,
+ .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup,
+#endif
.ndo_fix_features = vlan_dev_fix_features,
};
--
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