tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
7struct gro_cell {
8 struct sk_buff_head napi_skbs;
9 struct napi_struct napi;
10};
11
12int 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}
33EXPORT_SYMBOL(gro_cells_receive);
34
35/* called under BH context */
36static 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
55int 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}
76EXPORT_SYMBOL(gro_cells_init);
77
78void 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}
93EXPORT_SYMBOL(gro_cells_destroy);