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Linux/net/core/gro_cells.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <linux/skbuff.h>
  3 #include <linux/slab.h>
  4 #include <linux/netdevice.h>
  5 #include <net/gro_cells.h>
  6 
  7 struct gro_cell {
  8         struct sk_buff_head     napi_skbs;
  9         struct napi_struct      napi;
 10 };
 11 
 12 int gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb)
 13 {
 14         struct net_device *dev = skb->dev;
 15         struct gro_cell *cell;
 16 
 17         if (!gcells->cells || skb_cloned(skb) || netif_elide_gro(dev))
 18                 return netif_rx(skb);
 19 
 20         cell = this_cpu_ptr(gcells->cells);
 21 
 22         if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) {
 23                 atomic_long_inc(&dev->rx_dropped);
 24                 kfree_skb(skb);
 25                 return NET_RX_DROP;
 26         }
 27 
 28         __skb_queue_tail(&cell->napi_skbs, skb);
 29         if (skb_queue_len(&cell->napi_skbs) == 1)
 30                 napi_schedule(&cell->napi);
 31         return NET_RX_SUCCESS;
 32 }
 33 EXPORT_SYMBOL(gro_cells_receive);
 34 
 35 /* called under BH context */
 36 static int gro_cell_poll(struct napi_struct *napi, int budget)
 37 {
 38         struct gro_cell *cell = container_of(napi, struct gro_cell, napi);
 39         struct sk_buff *skb;
 40         int work_done = 0;
 41 
 42         while (work_done < budget) {
 43                 skb = __skb_dequeue(&cell->napi_skbs);
 44                 if (!skb)
 45                         break;
 46                 napi_gro_receive(napi, skb);
 47                 work_done++;
 48         }
 49 
 50         if (work_done < budget)
 51                 napi_complete_done(napi, work_done);
 52         return work_done;
 53 }
 54 
 55 int gro_cells_init(struct gro_cells *gcells, struct net_device *dev)
 56 {
 57         int i;
 58 
 59         gcells->cells = alloc_percpu(struct gro_cell);
 60         if (!gcells->cells)
 61                 return -ENOMEM;
 62 
 63         for_each_possible_cpu(i) {
 64                 struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
 65 
 66                 __skb_queue_head_init(&cell->napi_skbs);
 67 
 68                 set_bit(NAPI_STATE_NO_BUSY_POLL, &cell->napi.state);
 69 
 70                 netif_napi_add(dev, &cell->napi, gro_cell_poll,
 71                                NAPI_POLL_WEIGHT);
 72                 napi_enable(&cell->napi);
 73         }
 74         return 0;
 75 }
 76 EXPORT_SYMBOL(gro_cells_init);
 77 
 78 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 EXPORT_SYMBOL(gro_cells_destroy);
 94 

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