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| author | Eliezer Tamir <eliezer.tamir@linux.intel.com> | 2013-06-10 11:39:41 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-06-10 21:22:35 -0700 |
| commit | af12fa6e46aa651e7b86a4c4117b562518fef184 (patch) | |
| tree | 1425ef11083e66af192c33abb3b1fa3b04b26f4b /include | |
| parent | 6f00a0229627ca189529cad3f9154ac2f9e5c7db (diff) | |
| download | vxlan-next-af12fa6e46aa651e7b86a4c4117b562518fef184.tar.gz | |
net: add napi_id and hash
Adds a napi_id and a hashing mechanism to lookup a napi by id.
This will be used by subsequent patches to implement low latency
Ethernet device polling.
Based on a code sample by Eric Dumazet.
Signed-off-by: Eliezer Tamir <eliezer.tamir@linux.intel.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Tested-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/netdevice.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 8f967e34142baf..39bbd462d68ed4 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -324,12 +324,15 @@ struct napi_struct { struct sk_buff *gro_list; struct sk_buff *skb; struct list_head dev_list; + struct hlist_node napi_hash_node; + unsigned int napi_id; }; enum { NAPI_STATE_SCHED, /* Poll is scheduled */ NAPI_STATE_DISABLE, /* Disable pending */ NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */ + NAPI_STATE_HASHED, /* In NAPI hash */ }; enum gro_result { @@ -446,6 +449,32 @@ extern void __napi_complete(struct napi_struct *n); extern void napi_complete(struct napi_struct *n); /** + * napi_by_id - lookup a NAPI by napi_id + * @napi_id: hashed napi_id + * + * lookup @napi_id in napi_hash table + * must be called under rcu_read_lock() + */ +extern struct napi_struct *napi_by_id(unsigned int napi_id); + +/** + * napi_hash_add - add a NAPI to global hashtable + * @napi: napi context + * + * generate a new napi_id and store a @napi under it in napi_hash + */ +extern void napi_hash_add(struct napi_struct *napi); + +/** + * napi_hash_del - remove a NAPI from global table + * @napi: napi context + * + * Warning: caller must observe rcu grace period + * before freeing memory containing @napi + */ +extern void napi_hash_del(struct napi_struct *napi); + +/** * napi_disable - prevent NAPI from scheduling * @n: napi context * |