1 #ifndef _NET_GRO_CELLS_H
2 #define _NET_GRO_CELLS_H
3
4 #include <linux/skbuff.h>
5 #include <linux/slab.h>
6 #include <linux/netdevice.h>
7
8 struct gro_cell {
9 struct sk_buff_head napi_skbs;
10 struct napi_struct napi;
11 };
12
13 struct gro_cells {
14 struct gro_cell __percpu *cells;
15 };
16
gro_cells_receive(struct gro_cells * gcells,struct sk_buff * skb)17 static inline int gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb)
18 {
19 struct gro_cell *cell;
20 struct net_device *dev = skb->dev;
21
22 if (!gcells->cells || skb_cloned(skb) || !(dev->features & NETIF_F_GRO))
23 return netif_rx(skb);
24
25 cell = this_cpu_ptr(gcells->cells);
26
27 if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) {
28 atomic_long_inc(&dev->rx_dropped);
29 kfree_skb(skb);
30 return NET_RX_DROP;
31 }
32
33 __skb_queue_tail(&cell->napi_skbs, skb);
34 if (skb_queue_len(&cell->napi_skbs) == 1)
35 napi_schedule(&cell->napi);
36 return NET_RX_SUCCESS;
37 }
38
39 /* called under BH context */
gro_cell_poll(struct napi_struct * napi,int budget)40 static inline int gro_cell_poll(struct napi_struct *napi, int budget)
41 {
42 struct gro_cell *cell = container_of(napi, struct gro_cell, napi);
43 struct sk_buff *skb;
44 int work_done = 0;
45
46 while (work_done < budget) {
47 skb = __skb_dequeue(&cell->napi_skbs);
48 if (!skb)
49 break;
50 napi_gro_receive(napi, skb);
51 work_done++;
52 }
53
54 if (work_done < budget)
55 napi_complete_done(napi, work_done);
56 return work_done;
57 }
58
gro_cells_init(struct gro_cells * gcells,struct net_device * dev)59 static inline int gro_cells_init(struct gro_cells *gcells, struct net_device *dev)
60 {
61 int i;
62
63 gcells->cells = alloc_percpu(struct gro_cell);
64 if (!gcells->cells)
65 return -ENOMEM;
66
67 for_each_possible_cpu(i) {
68 struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
69
70 __skb_queue_head_init(&cell->napi_skbs);
71
72 set_bit(NAPI_STATE_NO_BUSY_POLL, &cell->napi.state);
73
74 netif_napi_add(dev, &cell->napi, gro_cell_poll, 64);
75 napi_enable(&cell->napi);
76 }
77 return 0;
78 }
79
gro_cells_destroy(struct gro_cells * gcells)80 static inline void gro_cells_destroy(struct gro_cells *gcells)
81 {
82 int i;
83
84 if (!gcells->cells)
85 return;
86 for_each_possible_cpu(i) {
87 struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
88
89 netif_napi_del(&cell->napi);
90 __skb_queue_purge(&cell->napi_skbs);
91 }
92 free_percpu(gcells->cells);
93 gcells->cells = NULL;
94 }
95
96 #endif
97