1c9e6bc64SEric Dumazet #ifndef _NET_GRO_CELLS_H 2c9e6bc64SEric Dumazet #define _NET_GRO_CELLS_H 3c9e6bc64SEric Dumazet 4c9e6bc64SEric Dumazet #include <linux/skbuff.h> 5c9e6bc64SEric Dumazet #include <linux/slab.h> 6c9e6bc64SEric Dumazet #include <linux/netdevice.h> 7c9e6bc64SEric Dumazet 8c9e6bc64SEric Dumazet struct gro_cell { 9c9e6bc64SEric Dumazet struct sk_buff_head napi_skbs; 10c9e6bc64SEric Dumazet struct napi_struct napi; 1188340160SMartin KaFai Lau }; 12c9e6bc64SEric Dumazet 13c9e6bc64SEric Dumazet struct gro_cells { 1488340160SMartin KaFai Lau struct gro_cell __percpu *cells; 15c9e6bc64SEric Dumazet }; 16c9e6bc64SEric Dumazet 17c9e6bc64SEric Dumazet static inline void gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb) 18c9e6bc64SEric Dumazet { 1988340160SMartin KaFai Lau struct gro_cell *cell; 20c9e6bc64SEric Dumazet struct net_device *dev = skb->dev; 21c9e6bc64SEric Dumazet 2288340160SMartin KaFai Lau if (!gcells->cells || skb_cloned(skb) || !(dev->features & NETIF_F_GRO)) { 23c9e6bc64SEric Dumazet netif_rx(skb); 24c9e6bc64SEric Dumazet return; 25c9e6bc64SEric Dumazet } 26c9e6bc64SEric Dumazet 2788340160SMartin KaFai Lau cell = this_cpu_ptr(gcells->cells); 28c9e6bc64SEric Dumazet 29c9e6bc64SEric Dumazet if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) { 30c9e6bc64SEric Dumazet atomic_long_inc(&dev->rx_dropped); 31c9e6bc64SEric Dumazet kfree_skb(skb); 32c9e6bc64SEric Dumazet return; 33c9e6bc64SEric Dumazet } 34c9e6bc64SEric Dumazet 35f8e8f97cSEric Dumazet /* We run in BH context */ 36f8e8f97cSEric Dumazet spin_lock(&cell->napi_skbs.lock); 37c9e6bc64SEric Dumazet 38c9e6bc64SEric Dumazet __skb_queue_tail(&cell->napi_skbs, skb); 39c9e6bc64SEric Dumazet if (skb_queue_len(&cell->napi_skbs) == 1) 40c9e6bc64SEric Dumazet napi_schedule(&cell->napi); 41c9e6bc64SEric Dumazet 42f8e8f97cSEric Dumazet spin_unlock(&cell->napi_skbs.lock); 43c9e6bc64SEric Dumazet } 44c9e6bc64SEric Dumazet 45f8e8f97cSEric Dumazet /* called unser BH context */ 46c9e6bc64SEric Dumazet static inline int gro_cell_poll(struct napi_struct *napi, int budget) 47c9e6bc64SEric Dumazet { 48c9e6bc64SEric Dumazet struct gro_cell *cell = container_of(napi, struct gro_cell, napi); 49c9e6bc64SEric Dumazet struct sk_buff *skb; 50c9e6bc64SEric Dumazet int work_done = 0; 51c9e6bc64SEric Dumazet 52f8e8f97cSEric Dumazet spin_lock(&cell->napi_skbs.lock); 53c9e6bc64SEric Dumazet while (work_done < budget) { 54f8e8f97cSEric Dumazet skb = __skb_dequeue(&cell->napi_skbs); 55c9e6bc64SEric Dumazet if (!skb) 56c9e6bc64SEric Dumazet break; 57f8e8f97cSEric Dumazet spin_unlock(&cell->napi_skbs.lock); 58c9e6bc64SEric Dumazet napi_gro_receive(napi, skb); 59c9e6bc64SEric Dumazet work_done++; 60f8e8f97cSEric Dumazet spin_lock(&cell->napi_skbs.lock); 61c9e6bc64SEric Dumazet } 62c9e6bc64SEric Dumazet 63c9e6bc64SEric Dumazet if (work_done < budget) 64c9e6bc64SEric Dumazet napi_complete(napi); 65f8e8f97cSEric Dumazet spin_unlock(&cell->napi_skbs.lock); 66c9e6bc64SEric Dumazet return work_done; 67c9e6bc64SEric Dumazet } 68c9e6bc64SEric Dumazet 69c9e6bc64SEric Dumazet static inline int gro_cells_init(struct gro_cells *gcells, struct net_device *dev) 70c9e6bc64SEric Dumazet { 71c9e6bc64SEric Dumazet int i; 72c9e6bc64SEric Dumazet 7388340160SMartin KaFai Lau gcells->cells = alloc_percpu(struct gro_cell); 74c9e6bc64SEric Dumazet if (!gcells->cells) 75c9e6bc64SEric Dumazet return -ENOMEM; 76c9e6bc64SEric Dumazet 7788340160SMartin KaFai Lau for_each_possible_cpu(i) { 7888340160SMartin KaFai Lau struct gro_cell *cell = per_cpu_ptr(gcells->cells, i); 79c9e6bc64SEric Dumazet 80c9e6bc64SEric Dumazet skb_queue_head_init(&cell->napi_skbs); 81c9e6bc64SEric Dumazet netif_napi_add(dev, &cell->napi, gro_cell_poll, 64); 82c9e6bc64SEric Dumazet napi_enable(&cell->napi); 83c9e6bc64SEric Dumazet } 84c9e6bc64SEric Dumazet return 0; 85c9e6bc64SEric Dumazet } 86c9e6bc64SEric Dumazet 87c9e6bc64SEric Dumazet static inline void gro_cells_destroy(struct gro_cells *gcells) 88c9e6bc64SEric Dumazet { 89c9e6bc64SEric Dumazet int i; 90c9e6bc64SEric Dumazet 9188340160SMartin KaFai Lau if (!gcells->cells) 92c9e6bc64SEric Dumazet return; 9388340160SMartin KaFai Lau for_each_possible_cpu(i) { 9488340160SMartin KaFai Lau struct gro_cell *cell = per_cpu_ptr(gcells->cells, i); 95c9e6bc64SEric Dumazet netif_napi_del(&cell->napi); 96c9e6bc64SEric Dumazet skb_queue_purge(&cell->napi_skbs); 97c9e6bc64SEric Dumazet } 9888340160SMartin KaFai Lau free_percpu(gcells->cells); 99c9e6bc64SEric Dumazet gcells->cells = NULL; 100c9e6bc64SEric Dumazet } 101c9e6bc64SEric Dumazet 102c9e6bc64SEric Dumazet #endif 103