#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/string.h>
+#include <linux/if_arp.h>
#include <linux/inetdevice.h>
#include <linux/inet.h>
#include <linux/interrupt.h>
#define MAX_UDP_CHUNK 1460
#define MAX_SKBS 32
#define MAX_QUEUE_DEPTH (MAX_SKBS / 2)
+#define MAX_RETRIES 20000
static DEFINE_SPINLOCK(skb_list_lock);
static int nr_skbs;
static int checksum_udp(struct sk_buff *skb, struct udphdr *uh,
unsigned short ulen, u32 saddr, u32 daddr)
{
- if (uh->check == 0)
+ unsigned int psum;
+
+ if (uh->check == 0 || skb->ip_summed == CHECKSUM_UNNECESSARY)
return 0;
- if (skb->ip_summed == CHECKSUM_HW)
- return csum_tcpudp_magic(
- saddr, daddr, ulen, IPPROTO_UDP, skb->csum);
+ psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0);
+
+ if (skb->ip_summed == CHECKSUM_HW &&
+ !(u16)csum_fold(csum_add(psum, skb->csum)))
+ return 0;
- skb->csum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0);
+ skb->csum = psum;
- return csum_fold(skb_checksum(skb, 0, skb->len, skb->csum));
+ return __skb_checksum_complete(skb);
}
/*
*/
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);
}
}
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)) {
+ if (!np || !np->dev || !netif_running(np->dev)) {
__kfree_skb(skb);
return;
}
+ npinfo = np->dev->npinfo;
+
/* avoid recursion */
- if(np->poll_owner == smp_processor_id() ||
- np->dev->xmit_lock_owner == smp_processor_id()) {
+ if (npinfo->poll_owner == smp_processor_id() ||
+ np->dev->xmit_lock_owner == smp_processor_id()) {
if (np->drop)
np->drop(skb);
else
return;
}
- spin_lock(&np->dev->xmit_lock);
- np->dev->xmit_lock_owner = smp_processor_id();
+ do {
+ npinfo->tries--;
+ spin_lock(&np->dev->xmit_lock);
+ np->dev->xmit_lock_owner = smp_processor_id();
- /*
- * network drivers do not expect to be called if the queue is
- * stopped.
- */
- if (netif_queue_stopped(np->dev)) {
+ /*
+ * network drivers do not expect to be called if the queue is
+ * stopped.
+ */
+ if (netif_queue_stopped(np->dev)) {
+ np->dev->xmit_lock_owner = -1;
+ spin_unlock(&np->dev->xmit_lock);
+ netpoll_poll(np);
+ udelay(50);
+ continue;
+ }
+
+ status = np->dev->hard_start_xmit(skb, np->dev);
np->dev->xmit_lock_owner = -1;
spin_unlock(&np->dev->xmit_lock);
- netpoll_poll(np);
- goto repeat;
- }
-
- status = np->dev->hard_start_xmit(skb, np->dev);
- np->dev->xmit_lock_owner = -1;
- spin_unlock(&np->dev->xmit_lock);
+ /* success */
+ if(!status) {
+ npinfo->tries = MAX_RETRIES; /* reset */
+ return;
+ }
- /* transmit busy */
- if(status) {
+ /* transmit busy */
netpoll_poll(np);
- goto repeat;
- }
+ udelay(50);
+ } while (npinfo->tries > 0);
}
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->rx_np && npinfo->rx_np->dev == skb->dev)
+ np = npinfo->rx_np;
+ if (!np)
+ return;
/* No arp on this interface */
if (skb->dev->flags & IFF_NOARP)
int proto, len, ulen;
struct iphdr *iph;
struct udphdr *uh;
- struct netpoll *np = skb->dev->np;
+ struct netpoll *np = skb->dev->npinfo->rx_np;
- if (!np->rx_hook)
+ if (!np)
goto out;
if (skb->dev->type != ARPHRD_ETHER)
goto out;
if (ulen != len)
goto out;
- if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr) < 0)
+ if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr))
goto out;
if (np->local_ip && np->local_ip != ntohl(iph->daddr))
goto out;
{
struct net_device *ndev = NULL;
struct in_device *in_dev;
-
- np->poll_lock = SPIN_LOCK_UNLOCKED;
- np->poll_owner = -1;
+ struct netpoll_info *npinfo;
+ unsigned long flags;
if (np->dev_name)
ndev = dev_get_by_name(np->dev_name);
}
np->dev = ndev;
- ndev->np = np;
+ if (!ndev->npinfo) {
+ npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL);
+ if (!npinfo)
+ goto release;
+
+ npinfo->rx_flags = 0;
+ npinfo->rx_np = NULL;
+ spin_lock_init(&npinfo->poll_lock);
+ npinfo->poll_owner = -1;
+ npinfo->tries = MAX_RETRIES;
+ spin_lock_init(&npinfo->rx_lock);
+ } else
+ npinfo = ndev->npinfo;
if (!ndev->poll_controller) {
printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n",
printk(KERN_INFO "%s: device %s not up yet, forcing it\n",
np->name, np->dev_name);
- rtnl_shlock();
+ rtnl_lock();
if (dev_change_flags(ndev, ndev->flags | IFF_UP) < 0) {
printk(KERN_ERR "%s: failed to open %s\n",
np->name, np->dev_name);
- rtnl_shunlock();
+ rtnl_unlock();
goto release;
}
- rtnl_shunlock();
+ rtnl_unlock();
atleast = jiffies + HZ/10;
atmost = jiffies + 4*HZ;
}
}
- if (!memcmp(np->local_mac, "\0\0\0\0\0\0", 6) && ndev->dev_addr)
+ if (is_zero_ether_addr(np->local_mac) && ndev->dev_addr)
memcpy(np->local_mac, ndev->dev_addr, 6);
if (!np->local_ip) {
rcu_read_lock();
- in_dev = __in_dev_get(ndev);
+ in_dev = __in_dev_get_rcu(ndev);
if (!in_dev || !in_dev->ifa_list) {
rcu_read_unlock();
np->name, HIPQUAD(np->local_ip));
}
- if(np->rx_hook)
- np->rx_flags = NETPOLL_RX_ENABLED;
+ if (np->rx_hook) {
+ spin_lock_irqsave(&npinfo->rx_lock, flags);
+ npinfo->rx_flags |= NETPOLL_RX_ENABLED;
+ npinfo->rx_np = np;
+ spin_unlock_irqrestore(&npinfo->rx_lock, flags);
+ }
+
+ /* fill up the skb queue */
+ refill_skbs();
+
+ /* last thing to do is link it to the net device structure */
+ ndev->npinfo = npinfo;
+
+ /* avoid racing with NAPI reading npinfo */
+ synchronize_rcu();
return 0;
release:
- ndev->np = NULL;
+ if (!ndev->npinfo)
+ kfree(npinfo);
np->dev = NULL;
dev_put(ndev);
return -1;
void netpoll_cleanup(struct netpoll *np)
{
- if (np->dev)
- np->dev->np = NULL;
- dev_put(np->dev);
+ struct netpoll_info *npinfo;
+ unsigned long flags;
+
+ if (np->dev) {
+ npinfo = np->dev->npinfo;
+ if (npinfo && npinfo->rx_np == np) {
+ spin_lock_irqsave(&npinfo->rx_lock, flags);
+ npinfo->rx_np = NULL;
+ npinfo->rx_flags &= ~NETPOLL_RX_ENABLED;
+ spin_unlock_irqrestore(&npinfo->rx_lock, flags);
+ }
+ dev_put(np->dev);
+ }
+
np->dev = NULL;
}
git://git.onelab.eu / linux-2.6.git / blobdiff