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gro_cells: move to net/core/gro_cells.c

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We have many gro cells users, so lets move the code to avoid
duplication.

This creates a CONFIG_GRO_CELLS option.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2017-02-07 15:37:15 -08:00 committed by David S. Miller
parent 40710cf9ad
commit 97e219b7c1
8 changed files with 107 additions and 82 deletions
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3
drivers/net/Kconfig
View File

@ -170,6 +170,7 @@ config VXLAN
tristate "Virtual eXtensible Local Area Network (VXLAN)"
depends on INET
select NET_UDP_TUNNEL
select GRO_CELLS
---help---
This allows one to create vxlan virtual interfaces that provide
Layer 2 Networks over Layer 3 Networks. VXLAN is often used
@ -184,6 +185,7 @@ config GENEVE
tristate "Generic Network Virtualization Encapsulation"
depends on INET && NET_UDP_TUNNEL
select NET_IP_TUNNEL
select GRO_CELLS
---help---
This allows one to create geneve virtual interfaces that provide
Layer 2 Networks over Layer 3 Networks. GENEVE is often used
@ -216,6 +218,7 @@ config MACSEC
select CRYPTO
select CRYPTO_AES
select CRYPTO_GCM
select GRO_CELLS
---help---
MACsec is an encryption standard for Ethernet.

86
include/net/gro_cells.h
View File

@ -5,92 +5,14 @@
#include <linux/slab.h>
#include <linux/netdevice.h>
struct gro_cell {
struct sk_buff_head napi_skbs;
struct napi_struct napi;
};
struct gro_cell;
struct gro_cells {
struct gro_cell __percpu *cells;
};
static inline int 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))
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;
}
/* called under 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;
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;
}
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);
set_bit(NAPI_STATE_NO_BUSY_POLL, &cell->napi.state);
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;
}
int gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb);
int gro_cells_init(struct gro_cells *gcells, struct net_device *dev);
void gro_cells_destroy(struct gro_cells *gcells);
#endif

4
net/Kconfig
View File

@ -413,6 +413,10 @@ config DST_CACHE
bool
default n
config GRO_CELLS
bool
default n
config NET_DEVLINK
tristate "Network physical/parent device Netlink interface"
help

1
net/core/Makefile
View File

@ -28,3 +28,4 @@ obj-$(CONFIG_LWTUNNEL_BPF) += lwt_bpf.o
obj-$(CONFIG_DST_CACHE) += dst_cache.o
obj-$(CONFIG_HWBM) += hwbm.o
obj-$(CONFIG_NET_DEVLINK) += devlink.o
obj-$(CONFIG_GRO_CELLS) += gro_cells.o

92
net/core/gro_cells.c Normal file
View File

@ -0,0 +1,92 @@
#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) || !(dev->features & NETIF_F_GRO))
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);

1
net/ipv4/Kconfig
View File

@ -187,6 +187,7 @@ config NET_IPGRE_DEMUX
config NET_IP_TUNNEL
tristate
select DST_CACHE
select GRO_CELLS
default n
config NET_IPGRE

1
net/ipv6/Kconfig
View File

@ -208,6 +208,7 @@ config IPV6_TUNNEL
tristate "IPv6: IP-in-IPv6 tunnel (RFC2473)"
select INET6_TUNNEL
select DST_CACHE
select GRO_CELLS
---help---
Support for IPv6-in-IPv6 and IPv4-in-IPv6 tunnels described in
RFC 2473.

1
net/xfrm/Kconfig
View File

@ -4,6 +4,7 @@
config XFRM
bool
depends on NET
select GRO_CELLS
config XFRM_ALGO
tristate