1 #ifndef _NET_GRO_CELLS_H
2 #define _NET_GRO_CELLS_H
4 #include <linux/skbuff.h>
5 #include <linux/slab.h>
6 #include <linux/netdevice.h>
9 struct sk_buff_head napi_skbs;
10 struct napi_struct napi;
14 struct gro_cell __percpu *cells;
17 static inline void gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb)
19 struct gro_cell *cell;
20 struct net_device *dev = skb->dev;
22 if (!gcells->cells || skb_cloned(skb) || !(dev->features & NETIF_F_GRO)) {
27 cell = this_cpu_ptr(gcells->cells);
29 if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) {
30 atomic_long_inc(&dev->rx_dropped);
35 /* We run in BH context */
36 spin_lock(&cell->napi_skbs.lock);
38 __skb_queue_tail(&cell->napi_skbs, skb);
39 if (skb_queue_len(&cell->napi_skbs) == 1)
40 napi_schedule(&cell->napi);
42 spin_unlock(&cell->napi_skbs.lock);
45 /* called unser BH context */
46 static inline int gro_cell_poll(struct napi_struct *napi, int budget)
48 struct gro_cell *cell = container_of(napi, struct gro_cell, napi);
52 spin_lock(&cell->napi_skbs.lock);
53 while (work_done < budget) {
54 skb = __skb_dequeue(&cell->napi_skbs);
57 spin_unlock(&cell->napi_skbs.lock);
58 napi_gro_receive(napi, skb);
60 spin_lock(&cell->napi_skbs.lock);
63 if (work_done < budget)
65 spin_unlock(&cell->napi_skbs.lock);
69 static inline int gro_cells_init(struct gro_cells *gcells, struct net_device *dev)
73 gcells->cells = alloc_percpu(struct gro_cell);
77 for_each_possible_cpu(i) {
78 struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
80 skb_queue_head_init(&cell->napi_skbs);
81 netif_napi_add(dev, &cell->napi, gro_cell_poll, 64);
82 napi_enable(&cell->napi);
87 static inline void gro_cells_destroy(struct gro_cells *gcells)
93 for_each_possible_cpu(i) {
94 struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
95 netif_napi_del(&cell->napi);
96 skb_queue_purge(&cell->napi_skbs);
98 free_percpu(gcells->cells);