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 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 */ 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 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 netif_napi_add(dev, &cell->napi, gro_cell_poll, 64); 72 napi_enable(&cell->napi); 73 } 74 return 0; 75 } 76 77 static inline void gro_cells_destroy(struct gro_cells *gcells) 78 { 79 int i; 80 81 if (!gcells->cells) 82 return; 83 for_each_possible_cpu(i) { 84 struct gro_cell *cell = per_cpu_ptr(gcells->cells, i); 85 86 netif_napi_del(&cell->napi); 87 __skb_queue_purge(&cell->napi_skbs); 88 } 89 free_percpu(gcells->cells); 90 gcells->cells = NULL; 91 } 92 93 #endif 94