Commit 115c1d6e authored by Jeff Moyer's avatar Jeff Moyer Committed by David S. Miller
Browse files

[NETPOLL]: Introduce a netpoll_info struct 



This patch introduces a netpoll_info structure, which the struct net_device
will now point to instead of pointing to a struct netpoll.  The reason for
this is two-fold: 1) fields such as the rx_flags, poll_owner, and poll_lock
should be maintained per net_device, not per netpoll;  and 2) this is a first
step in providing support for multiple netpoll clients to register against the
same net_device.

The struct netpoll is now pointed to by the netpoll_info structure.  As
such, the previous behaviour of the code is preserved.

Signed-off-by: default avatarJeff Moyer <jmoyer@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6ca4f65e

include/linux/netdevice.h

+2 −2
Original line number Diff line number Diff line
@@ -41,7 +41,7 @@ 
struct divert_blk;

struct vlan_group;

struct ethtool_ops;

struct netpoll;

struct netpoll_info;

					/* source back-compat hooks */

#define SET_ETHTOOL_OPS(netdev,ops) \

	( (netdev)->ethtool_ops = (ops) )
@@ -468,7 +468,7 @@ struct net_device 
						     unsigned char *haddr);

	int			(*neigh_setup)(struct net_device *dev, struct neigh_parms *);

#ifdef CONFIG_NETPOLL

	struct netpoll		*np;

	struct netpoll_info	*npinfo;

#endif

#ifdef CONFIG_NET_POLL_CONTROLLER

	void                    (*poll_controller)(struct net_device *dev);

include/linux/netpoll.h

+17 −8
Original line number Diff line number Diff line
@@ -16,14 +16,18 @@ struct netpoll; 
struct netpoll {

	struct net_device *dev;

	char dev_name[16], *name;

	int rx_flags;

	void (*rx_hook)(struct netpoll *, int, char *, int);

	void (*drop)(struct sk_buff *skb);

	u32 local_ip, remote_ip;

	u16 local_port, remote_port;

	unsigned char local_mac[6], remote_mac[6];

};



struct netpoll_info {

	spinlock_t poll_lock;

	int poll_owner;

	int rx_flags;

	struct netpoll *np;

};



void netpoll_poll(struct netpoll *np);
@@ -39,22 +43,27 @@ void netpoll_queue(struct sk_buff *skb); 
#ifdef CONFIG_NETPOLL

static inline int netpoll_rx(struct sk_buff *skb)

{

	return skb->dev->np && skb->dev->np->rx_flags && __netpoll_rx(skb);

	struct netpoll_info *npinfo = skb->dev->npinfo;



	if (!npinfo || !npinfo->rx_flags)

		return 0;



	return npinfo->np && __netpoll_rx(skb);

}



static inline void netpoll_poll_lock(struct net_device *dev)

{

	if (dev->np) {

		spin_lock(&dev->np->poll_lock);

		dev->np->poll_owner = smp_processor_id();

	if (dev->npinfo) {

		spin_lock(&dev->npinfo->poll_lock);

		dev->npinfo->poll_owner = smp_processor_id();

	}

}



static inline void netpoll_poll_unlock(struct net_device *dev)

{

	if (dev->np) {

		dev->np->poll_owner = -1;

		spin_unlock(&dev->np->poll_lock);

	if (dev->npinfo) {

		dev->npinfo->poll_owner = -1;

		spin_unlock(&dev->npinfo->poll_lock);

	}

}

net/core/netpoll.c

+38 −19
Original line number Diff line number Diff line
@@ -130,19 +130,20 @@ static int checksum_udp(struct sk_buff *skb, struct udphdr *uh, 
 */

static void poll_napi(struct netpoll *np)

{

	struct netpoll_info *npinfo = np->dev->npinfo;

	int budget = 16;



	if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) &&

	    np->poll_owner != smp_processor_id() &&

	    spin_trylock(&np->poll_lock)) {

		np->rx_flags |= NETPOLL_RX_DROP;

	    npinfo->poll_owner != smp_processor_id() &&

	    spin_trylock(&npinfo->poll_lock)) {

		npinfo->rx_flags |= NETPOLL_RX_DROP;

		atomic_inc(&trapped);



		np->dev->poll(np->dev, &budget);



		atomic_dec(&trapped);

		np->rx_flags &= ~NETPOLL_RX_DROP;

		spin_unlock(&np->poll_lock);

		npinfo->rx_flags &= ~NETPOLL_RX_DROP;

		spin_unlock(&npinfo->poll_lock);

	}

}
@@ -245,6 +246,7 @@ repeat: 
static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)

{

	int status;

	struct netpoll_info *npinfo;



repeat:

	if(!np || !np->dev || !netif_running(np->dev)) {
@@ -253,7 +255,8 @@ repeat: 
	}



	/* avoid recursion */

	if(np->poll_owner == smp_processor_id() ||

	npinfo = np->dev->npinfo;

	if (npinfo->poll_owner == smp_processor_id() ||

	    np->dev->xmit_lock_owner == smp_processor_id()) {

		if (np->drop)

			np->drop(skb);
@@ -341,14 +344,18 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len) 


static void arp_reply(struct sk_buff *skb)

{

	struct netpoll_info *npinfo = skb->dev->npinfo;

	struct arphdr *arp;

	unsigned char *arp_ptr;

	int size, type = ARPOP_REPLY, ptype = ETH_P_ARP;

	u32 sip, tip;

	struct sk_buff *send_skb;

	struct netpoll *np = skb->dev->np;

	struct netpoll *np = NULL;



	if (!np) return;

	if (npinfo)

		np = npinfo->np;

	if (!np)

		return;



	/* No arp on this interface */

	if (skb->dev->flags & IFF_NOARP)
@@ -429,7 +436,7 @@ int __netpoll_rx(struct sk_buff *skb) 
	int proto, len, ulen;

	struct iphdr *iph;

	struct udphdr *uh;

	struct netpoll *np = skb->dev->np;

	struct netpoll *np = skb->dev->npinfo->np;



	if (!np->rx_hook)

		goto out;
@@ -611,9 +618,7 @@ int netpoll_setup(struct netpoll *np) 
{

	struct net_device *ndev = NULL;

	struct in_device *in_dev;



	np->poll_lock = SPIN_LOCK_UNLOCKED;

	np->poll_owner = -1;

	struct netpoll_info *npinfo;



	if (np->dev_name)

		ndev = dev_get_by_name(np->dev_name);
@@ -624,7 +629,16 @@ int netpoll_setup(struct netpoll *np) 
	}



	np->dev = ndev;

	ndev->np = np;

	if (!ndev->npinfo) {

		npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL);

		if (!npinfo)

			goto release;



		npinfo->np = NULL;

		npinfo->poll_lock = SPIN_LOCK_UNLOCKED;

		npinfo->poll_owner = -1;

	} else

		npinfo = ndev->npinfo;



	if (!ndev->poll_controller) {

		printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n",
@@ -693,12 +707,15 @@ int netpoll_setup(struct netpoll *np) 
	}



	if(np->rx_hook)

		np->rx_flags = NETPOLL_RX_ENABLED;

		npinfo->rx_flags = NETPOLL_RX_ENABLED;

	npinfo->np = np;

	ndev->npinfo = npinfo;



	return 0;



 release:

	ndev->np = NULL;

	if (!ndev->npinfo)

		kfree(npinfo);

	np->dev = NULL;

	dev_put(ndev);

	return -1;
@@ -706,9 +723,11 @@ int netpoll_setup(struct netpoll *np) 


void netpoll_cleanup(struct netpoll *np)

{

	if (np->dev)

		np->dev->np = NULL;

	if (np->dev) {

		if (np->dev->npinfo)

			np->dev->npinfo->np = NULL;

		dev_put(np->dev);

	}

	np->dev = NULL;

}

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