[NET] netconsole: Support dynamic reconfiguration using configfs

[mv-sheeva.git] / net / core / netpoll.c

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index de1b26aa5720f011616413d87d852f94d46f9c52..0952f936b29283134fcd356ff52dd6acfbe24672 100644 (file)
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -119,19 +119,22 @@ static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh,
 static void poll_napi(struct netpoll *np)
 {
        struct netpoll_info *npinfo = np->dev->npinfo;
+       struct napi_struct *napi;
        int budget = 16;
 
-       if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) &&
-           npinfo->poll_owner != smp_processor_id() &&
-           spin_trylock(&npinfo->poll_lock)) {
-               npinfo->rx_flags |= NETPOLL_RX_DROP;
-               atomic_inc(&trapped);
+       list_for_each_entry(napi, &np->dev->napi_list, dev_list) {
+               if (test_bit(NAPI_STATE_SCHED, &napi->state) &&
+                   napi->poll_owner != smp_processor_id() &&
+                   spin_trylock(&napi->poll_lock)) {
+                       npinfo->rx_flags |= NETPOLL_RX_DROP;
+                       atomic_inc(&trapped);
 
-               np->dev->poll(np->dev, &budget);
+                       napi->poll(napi, budget);
 
-               atomic_dec(&trapped);
-               npinfo->rx_flags &= ~NETPOLL_RX_DROP;
-               spin_unlock(&npinfo->poll_lock);
+                       atomic_dec(&trapped);
+                       npinfo->rx_flags &= ~NETPOLL_RX_DROP;
+                       spin_unlock(&napi->poll_lock);
+               }
        }
 }
 
@@ -157,7 +160,7 @@ void netpoll_poll(struct netpoll *np)
 
        /* Process pending work on NIC */
        np->dev->poll_controller(np->dev);
-       if (np->dev->poll)
+       if (!list_empty(&np->dev->napi_list))
                poll_napi(np);
 
        service_arp_queue(np->dev->npinfo);
@@ -233,6 +236,17 @@ repeat:
        return skb;
 }
 
+static int netpoll_owner_active(struct net_device *dev)
+{
+       struct napi_struct *napi;
+
+       list_for_each_entry(napi, &dev->napi_list, dev_list) {
+               if (napi->poll_owner == smp_processor_id())
+                       return 1;
+       }
+       return 0;
+}
+
 static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
 {
        int status = NETDEV_TX_BUSY;
@@ -246,8 +260,7 @@ static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
        }
 
        /* don't get messages out of order, and no recursion */
-       if (skb_queue_len(&npinfo->txq) == 0 &&
-                   npinfo->poll_owner != smp_processor_id()) {
+       if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) {
                unsigned long flags;
 
                local_irq_save(flags);
@@ -519,6 +532,29 @@ out:
        return 0;
 }
 
+void netpoll_print_options(struct netpoll *np)
+{
+       printk(KERN_INFO "%s: local port %d\n",
+                        np->name, np->local_port);
+       printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
+                        np->name, HIPQUAD(np->local_ip));
+       printk(KERN_INFO "%s: interface %s\n",
+                        np->name, np->dev_name);
+       printk(KERN_INFO "%s: remote port %d\n",
+                        np->name, np->remote_port);
+       printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n",
+                        np->name, HIPQUAD(np->remote_ip));
+       printk(KERN_INFO "%s: remote ethernet address "
+                        "%02x:%02x:%02x:%02x:%02x:%02x\n",
+                        np->name,
+                        np->remote_mac[0],
+                        np->remote_mac[1],
+                        np->remote_mac[2],
+                        np->remote_mac[3],
+                        np->remote_mac[4],
+                        np->remote_mac[5]);
+}
+
 int netpoll_parse_options(struct netpoll *np, char *opt)
 {
        char *cur=opt, *delim;
@@ -531,7 +567,6 @@ int netpoll_parse_options(struct netpoll *np, char *opt)
                cur = delim;
        }
        cur++;
-       printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port);
 
        if (*cur != '/') {
                if ((delim = strchr(cur, '/')) == NULL)
@@ -539,9 +574,6 @@ int netpoll_parse_options(struct netpoll *np, char *opt)
                *delim = 0;
                np->local_ip = ntohl(in_aton(cur));
                cur = delim;
-
-               printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
-                      np->name, HIPQUAD(np->local_ip));
        }
        cur++;
 
@@ -555,8 +587,6 @@ int netpoll_parse_options(struct netpoll *np, char *opt)
        }
        cur++;
 
-       printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name);
-
        if (*cur != '@') {
                /* dst port */
                if ((delim = strchr(cur, '@')) == NULL)
@@ -566,7 +596,6 @@ int netpoll_parse_options(struct netpoll *np, char *opt)
                cur = delim;
        }
        cur++;
-       printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port);
 
        /* dst ip */
        if ((delim = strchr(cur, '/')) == NULL)
@@ -575,9 +604,6 @@ int netpoll_parse_options(struct netpoll *np, char *opt)
        np->remote_ip = ntohl(in_aton(cur));
        cur = delim + 1;
 
-       printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n",
-              np->name, HIPQUAD(np->remote_ip));
-
        if (*cur != 0) {
                /* MAC address */
                if ((delim = strchr(cur, ':')) == NULL)
@@ -608,15 +634,7 @@ int netpoll_parse_options(struct netpoll *np, char *opt)
                np->remote_mac[5] = simple_strtol(cur, NULL, 16);
        }
 
-       printk(KERN_INFO "%s: remote ethernet address "
-              "%02x:%02x:%02x:%02x:%02x:%02x\n",
-              np->name,
-              np->remote_mac[0],
-              np->remote_mac[1],
-              np->remote_mac[2],
-              np->remote_mac[3],
-              np->remote_mac[4],
-              np->remote_mac[5]);
+       netpoll_print_options(np);
 
        return 0;
 
@@ -652,8 +670,6 @@ int netpoll_setup(struct netpoll *np)
 
                npinfo->rx_flags = 0;
                npinfo->rx_np = NULL;
-               spin_lock_init(&npinfo->poll_lock);
-               npinfo->poll_owner = -1;
 
                spin_lock_init(&npinfo->rx_lock);
                skb_queue_head_init(&npinfo->arp_tx);
@@ -820,6 +836,7 @@ void netpoll_set_trap(int trap)
 
 EXPORT_SYMBOL(netpoll_set_trap);
 EXPORT_SYMBOL(netpoll_trap);
+EXPORT_SYMBOL(netpoll_print_options);
 EXPORT_SYMBOL(netpoll_parse_options);
 EXPORT_SYMBOL(netpoll_setup);
 EXPORT_SYMBOL(netpoll_cleanup);