[linux-block.git] / net / core / gro_cells.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <net/gro_cells.h>

struct gro_cell {
	struct sk_buff_head	napi_skbs;
	struct napi_struct	napi;
};

int gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	struct gro_cell *cell;

	if (!gcells->cells || skb_cloned(skb) || netif_elide_gro(dev))
		return netif_rx(skb);

	cell = this_cpu_ptr(gcells->cells);

	if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) {
		atomic_long_inc(&dev->rx_dropped);
		kfree_skb(skb);
		return NET_RX_DROP;
	}

	__skb_queue_tail(&cell->napi_skbs, skb);
	if (skb_queue_len(&cell->napi_skbs) == 1)
		napi_schedule(&cell->napi);
	return NET_RX_SUCCESS;
}
EXPORT_SYMBOL(gro_cells_receive);

/* called under BH context */
static int gro_cell_poll(struct napi_struct *napi, int budget)
{
	struct gro_cell *cell = container_of(napi, struct gro_cell, napi);
	struct sk_buff *skb;
	int work_done = 0;

	while (work_done < budget) {
		skb = __skb_dequeue(&cell->napi_skbs);
		if (!skb)
			break;
		napi_gro_receive(napi, skb);
		work_done++;
	}

	if (work_done < budget)
		napi_complete_done(napi, work_done);
	return work_done;
}

int gro_cells_init(struct gro_cells *gcells, struct net_device *dev)
{
	int i;

	gcells->cells = alloc_percpu(struct gro_cell);
	if (!gcells->cells)
		return -ENOMEM;

	for_each_possible_cpu(i) {
		struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);

		__skb_queue_head_init(&cell->napi_skbs);

		set_bit(NAPI_STATE_NO_BUSY_POLL, &cell->napi.state);

		netif_napi_add(dev, &cell->napi, gro_cell_poll,
			       NAPI_POLL_WEIGHT);
		napi_enable(&cell->napi);
	}
	return 0;
}
EXPORT_SYMBOL(gro_cells_init);

void gro_cells_destroy(struct gro_cells *gcells)
{
	int i;

	if (!gcells->cells)
		return;
	for_each_possible_cpu(i) {
		struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);

		netif_napi_del(&cell->napi);
		__skb_queue_purge(&cell->napi_skbs);
	}
	free_percpu(gcells->cells);
	gcells->cells = NULL;
}
EXPORT_SYMBOL(gro_cells_destroy);
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
97e219b7 ED	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
b5cdae32	17	if (!gcells->cells \|\| skb_cloned(skb) \|\| netif_elide_gro(dev))
97e219b7 ED	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);