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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - net/core/gro_cells.c
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>
8 struct sk_buff_head napi_skbs
;
9 struct napi_struct napi
;
12 int gro_cells_receive(struct gro_cells
*gcells
, struct sk_buff
*skb
)
14 struct net_device
*dev
= skb
->dev
;
15 struct gro_cell
*cell
;
19 if (unlikely(!(dev
->flags
& IFF_UP
)))
22 if (!gcells
->cells
|| skb_cloned(skb
) || netif_elide_gro(dev
)) {
27 cell
= this_cpu_ptr(gcells
->cells
);
29 if (skb_queue_len(&cell
->napi_skbs
) > netdev_max_backlog
) {
31 atomic_long_inc(&dev
->rx_dropped
);
37 __skb_queue_tail(&cell
->napi_skbs
, skb
);
38 if (skb_queue_len(&cell
->napi_skbs
) == 1)
39 napi_schedule(&cell
->napi
);
47 EXPORT_SYMBOL(gro_cells_receive
);
49 /* called under BH context */
50 static int gro_cell_poll(struct napi_struct
*napi
, int budget
)
52 struct gro_cell
*cell
= container_of(napi
, struct gro_cell
, napi
);
56 while (work_done
< budget
) {
57 skb
= __skb_dequeue(&cell
->napi_skbs
);
60 napi_gro_receive(napi
, skb
);
64 if (work_done
< budget
)
65 napi_complete_done(napi
, work_done
);
69 int gro_cells_init(struct gro_cells
*gcells
, struct net_device
*dev
)
73 gcells
->cells
= alloc_percpu(struct gro_cell
);
77 for_each_possible_cpu(i
) {
78 struct gro_cell
*cell
= per_cpu_ptr(gcells
->cells
, i
);
80 __skb_queue_head_init(&cell
->napi_skbs
);
82 set_bit(NAPI_STATE_NO_BUSY_POLL
, &cell
->napi
.state
);
84 netif_napi_add(dev
, &cell
->napi
, gro_cell_poll
,
86 napi_enable(&cell
->napi
);
90 EXPORT_SYMBOL(gro_cells_init
);
92 void gro_cells_destroy(struct gro_cells
*gcells
)
98 for_each_possible_cpu(i
) {
99 struct gro_cell
*cell
= per_cpu_ptr(gcells
->cells
, i
);
101 napi_disable(&cell
->napi
);
102 __netif_napi_del(&cell
->napi
);
103 __skb_queue_purge(&cell
->napi_skbs
);
105 /* This barrier is needed because netpoll could access dev->napi_list
106 * under rcu protection.
110 free_percpu(gcells
->cells
);
111 gcells
->cells
= NULL
;
113 EXPORT_SYMBOL(gro_cells_destroy
);