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; 11c9e6bc64SEric Dumazet } ____cacheline_aligned_in_smp; 12c9e6bc64SEric Dumazet 13c9e6bc64SEric Dumazet struct gro_cells { 14c9e6bc64SEric Dumazet unsigned int gro_cells_mask; 15c9e6bc64SEric Dumazet struct gro_cell *cells; 16c9e6bc64SEric Dumazet }; 17c9e6bc64SEric Dumazet 18c9e6bc64SEric Dumazet static inline void gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb) 19c9e6bc64SEric Dumazet { 20c9e6bc64SEric Dumazet struct gro_cell *cell = gcells->cells; 21c9e6bc64SEric Dumazet struct net_device *dev = skb->dev; 22c9e6bc64SEric Dumazet 23c9e6bc64SEric Dumazet if (!cell || skb_cloned(skb) || !(dev->features & NETIF_F_GRO)) { 24c9e6bc64SEric Dumazet netif_rx(skb); 25c9e6bc64SEric Dumazet return; 26c9e6bc64SEric Dumazet } 27c9e6bc64SEric Dumazet 28c9e6bc64SEric Dumazet if (skb_rx_queue_recorded(skb)) 29c9e6bc64SEric Dumazet cell += skb_get_rx_queue(skb) & gcells->gro_cells_mask; 30c9e6bc64SEric Dumazet 31c9e6bc64SEric Dumazet if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) { 32c9e6bc64SEric Dumazet atomic_long_inc(&dev->rx_dropped); 33c9e6bc64SEric Dumazet kfree_skb(skb); 34c9e6bc64SEric Dumazet return; 35c9e6bc64SEric Dumazet } 36c9e6bc64SEric Dumazet 37f8e8f97cSEric Dumazet /* We run in BH context */ 38f8e8f97cSEric Dumazet spin_lock(&cell->napi_skbs.lock); 39c9e6bc64SEric Dumazet 40c9e6bc64SEric Dumazet __skb_queue_tail(&cell->napi_skbs, skb); 41c9e6bc64SEric Dumazet if (skb_queue_len(&cell->napi_skbs) == 1) 42c9e6bc64SEric Dumazet napi_schedule(&cell->napi); 43c9e6bc64SEric Dumazet 44f8e8f97cSEric Dumazet spin_unlock(&cell->napi_skbs.lock); 45c9e6bc64SEric Dumazet } 46c9e6bc64SEric Dumazet 47f8e8f97cSEric Dumazet /* called unser BH context */ 48c9e6bc64SEric Dumazet static inline int gro_cell_poll(struct napi_struct *napi, int budget) 49c9e6bc64SEric Dumazet { 50c9e6bc64SEric Dumazet struct gro_cell *cell = container_of(napi, struct gro_cell, napi); 51c9e6bc64SEric Dumazet struct sk_buff *skb; 52c9e6bc64SEric Dumazet int work_done = 0; 53c9e6bc64SEric Dumazet 54f8e8f97cSEric Dumazet spin_lock(&cell->napi_skbs.lock); 55c9e6bc64SEric Dumazet while (work_done < budget) { 56f8e8f97cSEric Dumazet skb = __skb_dequeue(&cell->napi_skbs); 57c9e6bc64SEric Dumazet if (!skb) 58c9e6bc64SEric Dumazet break; 59f8e8f97cSEric Dumazet spin_unlock(&cell->napi_skbs.lock); 60c9e6bc64SEric Dumazet napi_gro_receive(napi, skb); 61c9e6bc64SEric Dumazet work_done++; 62f8e8f97cSEric Dumazet spin_lock(&cell->napi_skbs.lock); 63c9e6bc64SEric Dumazet } 64c9e6bc64SEric Dumazet 65c9e6bc64SEric Dumazet if (work_done < budget) 66c9e6bc64SEric Dumazet napi_complete(napi); 67f8e8f97cSEric Dumazet spin_unlock(&cell->napi_skbs.lock); 68c9e6bc64SEric Dumazet return work_done; 69c9e6bc64SEric Dumazet } 70c9e6bc64SEric Dumazet 71c9e6bc64SEric Dumazet static inline int gro_cells_init(struct gro_cells *gcells, struct net_device *dev) 72c9e6bc64SEric Dumazet { 73c9e6bc64SEric Dumazet int i; 74c9e6bc64SEric Dumazet 75c9e6bc64SEric Dumazet gcells->gro_cells_mask = roundup_pow_of_two(netif_get_num_default_rss_queues()) - 1; 76c9e6bc64SEric Dumazet gcells->cells = kcalloc(sizeof(struct gro_cell), 77c9e6bc64SEric Dumazet gcells->gro_cells_mask + 1, 78c9e6bc64SEric Dumazet GFP_KERNEL); 79c9e6bc64SEric Dumazet if (!gcells->cells) 80c9e6bc64SEric Dumazet return -ENOMEM; 81c9e6bc64SEric Dumazet 82c9e6bc64SEric Dumazet for (i = 0; i <= gcells->gro_cells_mask; i++) { 83c9e6bc64SEric Dumazet struct gro_cell *cell = gcells->cells + i; 84c9e6bc64SEric Dumazet 85c9e6bc64SEric Dumazet skb_queue_head_init(&cell->napi_skbs); 86c9e6bc64SEric Dumazet netif_napi_add(dev, &cell->napi, gro_cell_poll, 64); 87c9e6bc64SEric Dumazet napi_enable(&cell->napi); 88c9e6bc64SEric Dumazet } 89c9e6bc64SEric Dumazet return 0; 90c9e6bc64SEric Dumazet } 91c9e6bc64SEric Dumazet 92c9e6bc64SEric Dumazet static inline void gro_cells_destroy(struct gro_cells *gcells) 93c9e6bc64SEric Dumazet { 94c9e6bc64SEric Dumazet struct gro_cell *cell = gcells->cells; 95c9e6bc64SEric Dumazet int i; 96c9e6bc64SEric Dumazet 97c9e6bc64SEric Dumazet if (!cell) 98c9e6bc64SEric Dumazet return; 99c9e6bc64SEric Dumazet for (i = 0; i <= gcells->gro_cells_mask; i++,cell++) { 100c9e6bc64SEric Dumazet netif_napi_del(&cell->napi); 101c9e6bc64SEric Dumazet skb_queue_purge(&cell->napi_skbs); 102c9e6bc64SEric Dumazet } 103c9e6bc64SEric Dumazet kfree(gcells->cells); 104c9e6bc64SEric Dumazet gcells->cells = NULL; 105c9e6bc64SEric Dumazet } 106c9e6bc64SEric Dumazet 107c9e6bc64SEric Dumazet #endif 108