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net: add napi_id and hash

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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>
This commit is contained in:
Eliezer Tamir 2013-06-10 11:39:41 +03:00 • committed by David S. Miller
commit af12fa6e46
2 changed files with 88 additions and 0 deletions
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29
include/linux/netdevice.h
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@ -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 {
@ -445,6 +448,32 @@ static inline bool napi_reschedule(struct napi_struct *napi)
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