gro_cells: move to net/core/gro_cells.c
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>
diff --git a/net/Kconfig b/net/Kconfig
index 2f2842d..f19c0c3 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -413,6 +413,10 @@
bool
default n
+config GRO_CELLS
+ bool
+ default n
+
config NET_DEVLINK
tristate "Network physical/parent device Netlink interface"
help
diff --git a/net/core/Makefile b/net/core/Makefile
index f6761b6..79f9479 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -28,3 +28,4 @@
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
diff --git a/net/core/gro_cells.c b/net/core/gro_cells.c
new file mode 100644
index 0000000..c98bbfb
--- /dev/null
+++ b/net/core/gro_cells.c
@@ -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);
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 6e7baaf..e30f9ca 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -187,6 +187,7 @@
config NET_IP_TUNNEL
tristate
select DST_CACHE
+ select GRO_CELLS
default n
config NET_IPGRE
diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index ec1267e..3c7c76b 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -208,6 +208,7 @@
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.
diff --git a/net/xfrm/Kconfig b/net/xfrm/Kconfig
index bda1a13..c06d399 100644
--- a/net/xfrm/Kconfig
+++ b/net/xfrm/Kconfig
@@ -4,6 +4,7 @@
config XFRM
bool
depends on NET
+ select GRO_CELLS
config XFRM_ALGO
tristate