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Commit 4b035271 authored by Wang Li's avatar Wang Li Committed by David S. Miller
Browse files

net: tun: remove useless codes of tun_automq_select_queue 



Because the function __skb_get_hash_symmetric always returns non-zero.

Signed-off-by: default avatarZhang Yu <zhangyu31@baidu.com>
Signed-off-by: default avatarWang Li <wangli39@baidu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0c465be1

drivers/net/tun.c

+13 −22
Original line number Diff line number Diff line
@@ -562,12 +562,11 @@ static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) 
		e->rps_rxhash = hash;

}



/* We try to identify a flow through its rxhash first. The reason that

/* We try to identify a flow through its rxhash. The reason that

 * we do not check rxq no. is because some cards(e.g 82599), chooses

 * the rxq based on the txq where the last packet of the flow comes. As

 * the userspace application move between processors, we may get a

 * different rxq no. here. If we could not get rxhash, then we would

 * hope the rxq no. may help here.

 * different rxq no. here.

 */

static u16 tun_automq_select_queue(struct tun_struct *tun, struct sk_buff *skb)

{
@@ -578,18 +577,13 @@ static u16 tun_automq_select_queue(struct tun_struct *tun, struct sk_buff *skb) 
	numqueues = READ_ONCE(tun->numqueues);



	txq = __skb_get_hash_symmetric(skb);

	if (txq) {

	e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq);

	if (e) {

		tun_flow_save_rps_rxhash(e, txq);

		txq = e->queue_index;

		} else

	} else {

		/* use multiply and shift instead of expensive divide */

		txq = ((u64)txq * numqueues) >> 32;

	} else if (likely(skb_rx_queue_recorded(skb))) {

		txq = skb_get_rx_queue(skb);

		while (unlikely(txq >= numqueues))

			txq -= numqueues;

	}



	return txq;
@@ -1047,17 +1041,14 @@ static void tun_automq_xmit(struct tun_struct *tun, struct sk_buff *skb) 
		/* Select queue was not called for the skbuff, so we extract the

		 * RPS hash and save it into the flow_table here.

		 */

		struct tun_flow_entry *e;

		__u32 rxhash;



		rxhash = __skb_get_hash_symmetric(skb);

		if (rxhash) {

			struct tun_flow_entry *e;

			e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)],

					rxhash);

		e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], rxhash);

		if (e)

			tun_flow_save_rps_rxhash(e, rxhash);

	}

	}

#endif

}