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authorPatrick McHardy <kaber@trash.net>2013-04-17 06:47:01 (GMT)
committerDavid S. Miller <davem@davemloft.net>2013-04-19 18:57:57 (GMT)
commitccdfcc398594ddf3f77348c5a10938dbe9efefbe (patch)
tree5458e0eca52d0488e8c24c8587028b5bd29b60de /net/netlink/af_netlink.h
parentcf0a018ac669955c10e4fca24fa55dde58434e9a (diff)
downloadlinux-ccdfcc398594ddf3f77348c5a10938dbe9efefbe.tar.xz
netlink: mmaped netlink: ring setup
Add support for mmap'ed RX and TX ring setup and teardown based on the af_packet.c code. The following patches will use this to add the real mmap'ed receive and transmit functionality. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlink/af_netlink.h')
-rw-r--r--net/netlink/af_netlink.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/net/netlink/af_netlink.h b/net/netlink/af_netlink.h
index d9acb2a..ed85222 100644
--- a/net/netlink/af_netlink.h
+++ b/net/netlink/af_netlink.h
@@ -6,6 +6,20 @@
#define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8)
#define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long))
+struct netlink_ring {
+ void **pg_vec;
+ unsigned int head;
+ unsigned int frames_per_block;
+ unsigned int frame_size;
+ unsigned int frame_max;
+
+ unsigned int pg_vec_order;
+ unsigned int pg_vec_pages;
+ unsigned int pg_vec_len;
+
+ atomic_t pending;
+};
+
struct netlink_sock {
/* struct sock has to be the first member of netlink_sock */
struct sock sk;
@@ -24,6 +38,12 @@ struct netlink_sock {
void (*netlink_rcv)(struct sk_buff *skb);
void (*netlink_bind)(int group);
struct module *module;
+#ifdef CONFIG_NETLINK_MMAP
+ struct mutex pg_vec_lock;
+ struct netlink_ring rx_ring;
+ struct netlink_ring tx_ring;
+ atomic_t mapped;
+#endif /* CONFIG_NETLINK_MMAP */
};
static inline struct netlink_sock *nlk_sk(struct sock *sk)