diff options
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/dev.c | 193 |
1 files changed, 191 insertions, 2 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index e415f0b..d8d7d1f 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -129,6 +129,9 @@ #include "net-sysfs.h" +/* Instead of increasing this, you should create a hash table. */ +#define MAX_GRO_SKBS 8 + /* * The list of packet types we will receive (as opposed to discard) * and the routines to invoke. @@ -2335,6 +2338,122 @@ static void flush_backlog(void *arg) } } +static int napi_gro_complete(struct sk_buff *skb) +{ + struct packet_type *ptype; + __be16 type = skb->protocol; + struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; + int err = -ENOENT; + + if (!skb_shinfo(skb)->frag_list) + goto out; + + rcu_read_lock(); + list_for_each_entry_rcu(ptype, head, list) { + if (ptype->type != type || ptype->dev || !ptype->gro_complete) + continue; + + err = ptype->gro_complete(skb); + break; + } + rcu_read_unlock(); + + if (err) { + WARN_ON(&ptype->list == head); + kfree_skb(skb); + return NET_RX_SUCCESS; + } + +out: + __skb_push(skb, -skb_network_offset(skb)); + return netif_receive_skb(skb); +} + +void napi_gro_flush(struct napi_struct *napi) +{ + struct sk_buff *skb, *next; + + for (skb = napi->gro_list; skb; skb = next) { + next = skb->next; + skb->next = NULL; + napi_gro_complete(skb); + } + + napi->gro_list = NULL; +} +EXPORT_SYMBOL(napi_gro_flush); + +int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) +{ + struct sk_buff **pp = NULL; + struct packet_type *ptype; + __be16 type = skb->protocol; + struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; + int count = 0; + int mac_len; + + if (!(skb->dev->features & NETIF_F_GRO)) + goto normal; + + rcu_read_lock(); + list_for_each_entry_rcu(ptype, head, list) { + struct sk_buff *p; + + if (ptype->type != type || ptype->dev || !ptype->gro_receive) + continue; + + skb_reset_network_header(skb); + mac_len = skb->network_header - skb->mac_header; + skb->mac_len = mac_len; + NAPI_GRO_CB(skb)->same_flow = 0; + NAPI_GRO_CB(skb)->flush = 0; + + for (p = napi->gro_list; p; p = p->next) { + count++; + NAPI_GRO_CB(p)->same_flow = + p->mac_len == mac_len && + !memcmp(skb_mac_header(p), skb_mac_header(skb), + mac_len); + NAPI_GRO_CB(p)->flush = 0; + } + + pp = ptype->gro_receive(&napi->gro_list, skb); + break; + } + rcu_read_unlock(); + + if (&ptype->list == head) + goto normal; + + if (pp) { + struct sk_buff *nskb = *pp; + + *pp = nskb->next; + nskb->next = NULL; + napi_gro_complete(nskb); + count--; + } + + if (NAPI_GRO_CB(skb)->same_flow) + goto ok; + + if (NAPI_GRO_CB(skb)->flush || count >= MAX_GRO_SKBS) { + __skb_push(skb, -skb_network_offset(skb)); + goto normal; + } + + NAPI_GRO_CB(skb)->count = 1; + skb->next = napi->gro_list; + napi->gro_list = skb; + +ok: + return NET_RX_SUCCESS; + +normal: + return netif_receive_skb(skb); +} +EXPORT_SYMBOL(napi_gro_receive); + static int process_backlog(struct napi_struct *napi, int quota) { int work = 0; @@ -2354,9 +2473,11 @@ static int process_backlog(struct napi_struct *napi, int quota) } local_irq_enable(); - netif_receive_skb(skb); + napi_gro_receive(napi, skb); } while (++work < quota && jiffies == start_time); + napi_gro_flush(napi); + return work; } @@ -2377,6 +2498,68 @@ void __napi_schedule(struct napi_struct *n) } EXPORT_SYMBOL(__napi_schedule); +void __napi_complete(struct napi_struct *n) +{ + BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); + BUG_ON(n->gro_list); + + list_del(&n->poll_list); + smp_mb__before_clear_bit(); + clear_bit(NAPI_STATE_SCHED, &n->state); +} +EXPORT_SYMBOL(__napi_complete); + +void napi_complete(struct napi_struct *n) +{ + unsigned long flags; + + /* + * don't let napi dequeue from the cpu poll list + * just in case its running on a different cpu + */ + if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state))) + return; + + napi_gro_flush(n); + local_irq_save(flags); + __napi_complete(n); + local_irq_restore(flags); +} +EXPORT_SYMBOL(napi_complete); + +void netif_napi_add(struct net_device *dev, struct napi_struct *napi, + int (*poll)(struct napi_struct *, int), int weight) +{ + INIT_LIST_HEAD(&napi->poll_list); + napi->gro_list = NULL; + napi->poll = poll; + napi->weight = weight; + list_add(&napi->dev_list, &dev->napi_list); +#ifdef CONFIG_NETPOLL + napi->dev = dev; + spin_lock_init(&napi->poll_lock); + napi->poll_owner = -1; +#endif + set_bit(NAPI_STATE_SCHED, &napi->state); +} +EXPORT_SYMBOL(netif_napi_add); + +void netif_napi_del(struct napi_struct *napi) +{ + struct sk_buff *skb, *next; + + list_del(&napi->dev_list); + + for (skb = napi->gro_list; skb; skb = next) { + next = skb->next; + skb->next = NULL; + kfree_skb(skb); + } + + napi->gro_list = NULL; +} +EXPORT_SYMBOL(netif_napi_del); + static void net_rx_action(struct softirq_action *h) { @@ -4380,7 +4563,7 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, netdev_init_queues(dev); - netpoll_netdev_init(dev); + INIT_LIST_HEAD(&dev->napi_list); setup(dev); strcpy(dev->name, name); return dev; @@ -4397,10 +4580,15 @@ EXPORT_SYMBOL(alloc_netdev_mq); */ void free_netdev(struct net_device *dev) { + struct napi_struct *p, *n; + release_net(dev_net(dev)); kfree(dev->_tx); + list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) + netif_napi_del(p); + /* Compatibility with error handling in drivers */ if (dev->reg_state == NETREG_UNINITIALIZED) { kfree((char *)dev - dev->padded); @@ -4949,6 +5137,7 @@ static int __init net_dev_init(void) queue->backlog.poll = process_backlog; queue->backlog.weight = weight_p; + queue->backlog.gro_list = NULL; } dev_boot_phase = 0; |
