mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 00:34:20 +08:00
88340160f3
In the ipip tunnel, the skb->queue_mapping is lost in ipip_rcv(). All skb will be queued to the same cell->napi_skbs. The gro_cell_poll is pinned to one core under load. In production traffic, we also see severe rx_dropped in the tunl iface and it is probably due to this limit: skb_queue_len(&cell->napi_skbs) > netdev_max_backlog. This patch is trying to alloc_percpu(struct gro_cell) and schedule gro_cell_poll to process the skb in the same core. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
#ifndef _NET_GRO_CELLS_H
|
|
#define _NET_GRO_CELLS_H
|
|
|
|
#include <linux/skbuff.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/netdevice.h>
|
|
|
|
struct gro_cell {
|
|
struct sk_buff_head napi_skbs;
|
|
struct napi_struct napi;
|
|
};
|
|
|
|
struct gro_cells {
|
|
struct gro_cell __percpu *cells;
|
|
};
|
|
|
|
static inline void gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb)
|
|
{
|
|
struct gro_cell *cell;
|
|
struct net_device *dev = skb->dev;
|
|
|
|
if (!gcells->cells || skb_cloned(skb) || !(dev->features & NETIF_F_GRO)) {
|
|
netif_rx(skb);
|
|
return;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* We run in BH context */
|
|
spin_lock(&cell->napi_skbs.lock);
|
|
|
|
__skb_queue_tail(&cell->napi_skbs, skb);
|
|
if (skb_queue_len(&cell->napi_skbs) == 1)
|
|
napi_schedule(&cell->napi);
|
|
|
|
spin_unlock(&cell->napi_skbs.lock);
|
|
}
|
|
|
|
/* called unser BH context */
|
|
static inline 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;
|
|
|
|
spin_lock(&cell->napi_skbs.lock);
|
|
while (work_done < budget) {
|
|
skb = __skb_dequeue(&cell->napi_skbs);
|
|
if (!skb)
|
|
break;
|
|
spin_unlock(&cell->napi_skbs.lock);
|
|
napi_gro_receive(napi, skb);
|
|
work_done++;
|
|
spin_lock(&cell->napi_skbs.lock);
|
|
}
|
|
|
|
if (work_done < budget)
|
|
napi_complete(napi);
|
|
spin_unlock(&cell->napi_skbs.lock);
|
|
return work_done;
|
|
}
|
|
|
|
static inline 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);
|
|
netif_napi_add(dev, &cell->napi, gro_cell_poll, 64);
|
|
napi_enable(&cell->napi);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline 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;
|
|
}
|
|
|
|
#endif
|