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[NETPOLL]: Introduce a netpoll_info struct

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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: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jeff Moyer 2005-06-22 22:05:31 -07:00 committed by David S. Miller
parent 6ca4f65e6b
commit 115c1d6e61
3 changed files with 57 additions and 29 deletions
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4
include/linux/netdevice.h
View File

@ -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);

25
include/linux/netpoll.h
View File

@ -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);
}
}

57
net/core/netpoll.c
View File

@ -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)) {
@ -253,8 +255,9 @@ repeat:
}
/* avoid recursion */
if(np->poll_owner == smp_processor_id() ||
np->dev->xmit_lock_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);
else
@ -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;
dev_put(np->dev);
if (np->dev) {
if (np->dev->npinfo)
np->dev->npinfo->np = NULL;
dev_put(np->dev);
}
np->dev = NULL;
}