[mirror_ubuntu-bionic-kernel.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;
	int res;

	rcu_read_lock();
	if (unlikely(!(dev->flags & IFF_UP)))
		goto drop;

	if (!gcells->cells || skb_cloned(skb) || netif_elide_gro(dev)) {
		res = netif_rx(skb);
		goto unlock;
	}

	cell = this_cpu_ptr(gcells->cells);

	if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) {
drop:
		atomic_long_inc(&dev->rx_dropped);
		kfree_skb(skb);
		res = NET_RX_DROP;
		goto unlock;
	}

	__skb_queue_tail(&cell->napi_skbs, skb);
	if (skb_queue_len(&cell->napi_skbs) == 1)
		napi_schedule(&cell->napi);

	res = NET_RX_SUCCESS;

unlock:
	rcu_read_unlock();
	return res;
}
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);

		napi_disable(&cell->napi);
		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;
57b7f77f	16	int res;
97e219b7	17
57b7f77f ED	18	rcu_read_lock();
	19	if (unlikely(!(dev->flags & IFF_UP)))
	20	goto drop;
	21
	22	if (!gcells->cells \|\| skb_cloned(skb) \|\| netif_elide_gro(dev)) {
	23	res = netif_rx(skb);
	24	goto unlock;
	25	}
97e219b7 ED	26
	27	cell = this_cpu_ptr(gcells->cells);
	28
	29	if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) {
57b7f77f	30	drop:
97e219b7 ED	31	atomic_long_inc(&dev->rx_dropped);
97e219b7 ED	32	kfree_skb(skb);
57b7f77f ED	33	res = NET_RX_DROP;
57b7f77f ED	34	goto unlock;
97e219b7 ED	35	}
	36
	37	__skb_queue_tail(&cell->napi_skbs, skb);
	38	if (skb_queue_len(&cell->napi_skbs) == 1)
	39	napi_schedule(&cell->napi);
57b7f77f ED	40
	41	res = NET_RX_SUCCESS;
	42
	43	unlock:
	44	rcu_read_unlock();
	45	return res;
97e219b7 ED	46	}
	47	EXPORT_SYMBOL(gro_cells_receive);
	48
	49	/* called under BH context */
	50	static int gro_cell_poll(struct napi_struct *napi, int budget)
	51	{
	52	struct gro_cell *cell = container_of(napi, struct gro_cell, napi);
	53	struct sk_buff *skb;
	54	int work_done = 0;
	55
	56	while (work_done < budget) {
	57	skb = __skb_dequeue(&cell->napi_skbs);
	58	if (!skb)
	59	break;
	60	napi_gro_receive(napi, skb);
	61	work_done++;
	62	}
	63
	64	if (work_done < budget)
	65	napi_complete_done(napi, work_done);
	66	return work_done;
	67	}
	68
	69	int gro_cells_init(struct gro_cells gcells, struct net_device dev)
	70	{
	71	int i;
	72
	73	gcells->cells = alloc_percpu(struct gro_cell);
	74	if (!gcells->cells)
	75	return -ENOMEM;
	76
	77	for_each_possible_cpu(i) {
	78	struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
	79
	80	__skb_queue_head_init(&cell->napi_skbs);
	81
	82	set_bit(NAPI_STATE_NO_BUSY_POLL, &cell->napi.state);
	83
	84	netif_napi_add(dev, &cell->napi, gro_cell_poll,
	85	NAPI_POLL_WEIGHT);
	86	napi_enable(&cell->napi);
	87	}
	88	return 0;
	89	}
	90	EXPORT_SYMBOL(gro_cells_init);
	91
	92	void gro_cells_destroy(struct gro_cells *gcells)
	93	{
	94	int i;
	95
	96	if (!gcells->cells)
	97	return;
	98	for_each_possible_cpu(i) {
	99	struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
	100
7abb826c	101	napi_disable(&cell->napi);
97e219b7 ED	102	netif_napi_del(&cell->napi);
	103	__skb_queue_purge(&cell->napi_skbs);
	104	}
	105	free_percpu(gcells->cells);
	106	gcells->cells = NULL;
	107	}
	108	EXPORT_SYMBOL(gro_cells_destroy);