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Commit 0e001614 authored by Tom Herbert's avatar Tom Herbert Committed by David S. Miller
Browse files

net: Call skb_get_hash in get_xps_queue and __skb_tx_hash 



Call standard function to get a packet hash instead of taking this from
skb->sk->sk_hash or only using skb->protocol.

Signed-off-by: default avatarTom Herbert <therbert@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b73c3d0e

include/linux/netdevice.h

+1 −1
Original line number Original line Diff line number Diff line
@@ -2486,7 +2486,7 @@ static inline int netif_set_xps_queue(struct net_device *dev, 
 * as a distribution range limit for the returned value.

 * as a distribution range limit for the returned value.

 */

 */

static inline u16 skb_tx_hash(const struct net_device *dev,

static inline u16 skb_tx_hash(const struct net_device *dev,

			      const struct sk_buff *skb)

			      struct sk_buff *skb)

{

{

	return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);

	return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);

}

}

include/linux/skbuff.h

+1 −1
Original line number Original line Diff line number Diff line
@@ -3005,7 +3005,7 @@ static inline bool skb_rx_queue_recorded(const struct sk_buff *skb) 
	return skb->queue_mapping != 0;

	return skb->queue_mapping != 0;

}

}





u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,

u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb,

		  unsigned int num_tx_queues);

		  unsigned int num_tx_queues);





static inline struct sec_path *skb_sec_path(struct sk_buff *skb)

static inline struct sec_path *skb_sec_path(struct sk_buff *skb)

net/core/flow_dissector.c

+5 −24
Original line number Original line Diff line number Diff line
@@ -196,12 +196,6 @@ static __always_inline u32 __flow_hash_3words(u32 a, u32 b, u32 c) 
	return jhash_3words(a, b, c, hashrnd);

	return jhash_3words(a, b, c, hashrnd);

}

}





static __always_inline u32 __flow_hash_1word(u32 a)

{

	__flow_hash_secret_init();

	return jhash_1word(a, hashrnd);

}



static inline u32 __flow_hash_from_keys(struct flow_keys *keys)

static inline u32 __flow_hash_from_keys(struct flow_keys *keys)

{

{

	u32 hash;

	u32 hash;
@@ -253,7 +247,7 @@ EXPORT_SYMBOL(__skb_get_hash); 
 * Returns a Tx hash based on the given packet descriptor a Tx queues' number

 * Returns a Tx hash based on the given packet descriptor a Tx queues' number

 * to be used as a distribution range.

 * to be used as a distribution range.

 */

 */

u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,

u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb,

		  unsigned int num_tx_queues)

		  unsigned int num_tx_queues)

{

{

	u32 hash;

	u32 hash;
@@ -273,13 +267,7 @@ u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb, 
		qcount = dev->tc_to_txq[tc].count;

		qcount = dev->tc_to_txq[tc].count;

	}

	}





	if (skb->sk && skb->sk->sk_hash)

	return (u16) (((u64)skb_get_hash(skb) * qcount) >> 32) + qoffset;

		hash = skb->sk->sk_hash;

	else

		hash = (__force u16) skb->protocol;

	hash = __flow_hash_1word(hash);



	return (u16) (((u64) hash * qcount) >> 32) + qoffset;

}

}

EXPORT_SYMBOL(__skb_tx_hash);

EXPORT_SYMBOL(__skb_tx_hash);
@@ -351,17 +339,10 @@ static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb) 
		if (map) {

		if (map) {

			if (map->len == 1)

			if (map->len == 1)

				queue_index = map->queues[0];

				queue_index = map->queues[0];

			else {

				u32 hash;

				if (skb->sk && skb->sk->sk_hash)

					hash = skb->sk->sk_hash;

			else

			else

					hash = (__force u16) skb->protocol ^

					    skb->hash;

				hash = __flow_hash_1word(hash);

				queue_index = map->queues[

				queue_index = map->queues[

				    ((u64)hash * map->len) >> 32];

				    ((u64)skb_get_hash(skb) * map->len) >> 32];

			}



			if (unlikely(queue_index >= dev->real_num_tx_queues))

			if (unlikely(queue_index >= dev->real_num_tx_queues))

				queue_index = -1;

				queue_index = -1;

		}

		}