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 17 static inline void 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 netif_rx(skb); 24 return; 25 } 26 27 cell = this_cpu_ptr(gcells->cells); 28 29 if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) { 30 atomic_long_inc(&dev->rx_dropped); 31 kfree_skb(skb); 32 return; 33 } 34 35 __skb_queue_tail(&cell->napi_skbs, skb); 36 if (skb_queue_len(&cell->napi_skbs) == 1) 37 napi_schedule(&cell->napi); 38 } 39 40 /* called under BH context */ 41 static inline int gro_cell_poll(struct napi_struct *napi, int budget) 42 { 43 struct gro_cell *cell = container_of(napi, struct gro_cell, napi); 44 struct sk_buff *skb; 45 int work_done = 0; 46 47 while (work_done < budget) { 48 skb = __skb_dequeue(&cell->napi_skbs); 49 if (!skb) 50 break; 51 napi_gro_receive(napi, skb); 52 work_done++; 53 } 54 55 if (work_done < budget) 56 napi_complete_done(napi, work_done); 57 return work_done; 58 } 59 60 static inline int gro_cells_init(struct gro_cells *gcells, struct net_device *dev) 61 { 62 int i; 63 64 gcells->cells = alloc_percpu(struct gro_cell); 65 if (!gcells->cells) 66 return -ENOMEM; 67 68 for_each_possible_cpu(i) { 69 struct gro_cell *cell = per_cpu_ptr(gcells->cells, i); 70 71 __skb_queue_head_init(&cell->napi_skbs); 72 netif_napi_add(dev, &cell->napi, gro_cell_poll, 64); 73 napi_enable(&cell->napi); 74 } 75 return 0; 76 } 77 78 static inline void gro_cells_destroy(struct gro_cells *gcells) 79 { 80 int i; 81 82 if (!gcells->cells) 83 return; 84 for_each_possible_cpu(i) { 85 struct gro_cell *cell = per_cpu_ptr(gcells->cells, i); 86 87 netif_napi_del(&cell->napi); 88 __skb_queue_purge(&cell->napi_skbs); 89 } 90 free_percpu(gcells->cells); 91 gcells->cells = NULL; 92 } 93 94 #endif 95