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authorEric Dumazet2015-11-18 06:31:00 -0800
committerDavid S. Miller2015-11-18 16:17:41 -0500
commitd64b5e85bfe2fe4c790abcbd16d9ae32391ddd7e (patch)
tree3b15f27d6adbc7fbc1ed4dc605c30a577b50c1c6 /include/linux
parent93f93a4404159ecf7e9148f5ad0718ec702ac4cb (diff)
net: add netif_tx_napi_add()
netif_tx_napi_add() is a variant of netif_napi_add() It should be used by drivers that use a napi structure to exclusively poll TX. We do not want to add this kind of napi in napi_hash[] in following patches, adding generic busy polling to all NAPI drivers. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/netdevice.h23
1 files changed, 22 insertions, 1 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 2020a89df12b..838935d1cdbb 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -326,7 +326,8 @@ 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 */
+ NAPI_STATE_HASHED, /* In NAPI hash (busy polling possible) */
+ NAPI_STATE_NO_BUSY_POLL,/* Do not add in napi_hash, no busy polling */
};
enum gro_result {
@@ -1939,6 +1940,26 @@ void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
int (*poll)(struct napi_struct *, int), int weight);
/**
+ * netif_tx_napi_add - initialize a napi context
+ * @dev: network device
+ * @napi: napi context
+ * @poll: polling function
+ * @weight: default weight
+ *
+ * This variant of netif_napi_add() should be used from drivers using NAPI
+ * to exclusively poll a TX queue.
+ * This will avoid we add it into napi_hash[], thus polluting this hash table.
+ */
+static inline void netif_tx_napi_add(struct net_device *dev,
+ struct napi_struct *napi,
+ int (*poll)(struct napi_struct *, int),
+ int weight)
+{
+ set_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state);
+ netif_napi_add(dev, napi, poll, weight);
+}
+
+/**
* netif_napi_del - remove a napi context
* @napi: napi context
*