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;
11 } ____cacheline_aligned_in_smp;
14 unsigned int gro_cells_mask;
15 struct gro_cell *cells;
18 static inline void gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb)
21 struct gro_cell *cell = gcells->cells;
22 struct net_device *dev = skb->dev;
24 if (!cell || skb_cloned(skb) || !(dev->features & NETIF_F_GRO)) {
29 if (skb_rx_queue_recorded(skb))
30 cell += skb_get_rx_queue(skb) & gcells->gro_cells_mask;
32 if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) {
33 atomic_long_inc(&dev->rx_dropped);
38 spin_lock_irqsave(&cell->napi_skbs.lock, flags);
40 __skb_queue_tail(&cell->napi_skbs, skb);
41 if (skb_queue_len(&cell->napi_skbs) == 1)
42 napi_schedule(&cell->napi);
44 spin_unlock_irqrestore(&cell->napi_skbs.lock, flags);
47 static inline int gro_cell_poll(struct napi_struct *napi, int budget)
49 struct gro_cell *cell = container_of(napi, struct gro_cell, napi);
53 while (work_done < budget) {
54 skb = skb_dequeue(&cell->napi_skbs);
58 napi_gro_receive(napi, skb);
62 if (work_done < budget)
67 static inline int gro_cells_init(struct gro_cells *gcells, struct net_device *dev)
71 gcells->gro_cells_mask = roundup_pow_of_two(netif_get_num_default_rss_queues()) - 1;
72 gcells->cells = kcalloc(sizeof(struct gro_cell),
73 gcells->gro_cells_mask + 1,
78 for (i = 0; i <= gcells->gro_cells_mask; i++) {
79 struct gro_cell *cell = gcells->cells + i;
81 skb_queue_head_init(&cell->napi_skbs);
82 netif_napi_add(dev, &cell->napi, gro_cell_poll, 64);
83 napi_enable(&cell->napi);
88 static inline void gro_cells_destroy(struct gro_cells *gcells)
90 struct gro_cell *cell = gcells->cells;
95 for (i = 0; i <= gcells->gro_cells_mask; i++,cell++) {
96 netif_napi_del(&cell->napi);
97 skb_queue_purge(&cell->napi_skbs);
100 gcells->cells = NULL;