Re: [PATCH 1/7] net: refactor __netif_receive_skb_core

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On 04/15/2015 05:44 AM, David Laight wrote:
From: Alexander Duyck
Sent: 10 April 2015 20:56
On 04/10/2015 05:15 AM, Pablo Neira Ayuso wrote:
+another_round:
+	ret = __netif_receive_skb_ingress(skb, pfmemalloc, orig_dev);
+	switch (ret) {
+	case NET_RX_SUCCESS:
+	case NET_RX_DROP:
+		break;
+	case __NET_RX_ANOTHER_ROUND:
+		goto another_round;
+	}
  	rcu_read_unlock();
+
  	return ret;
  }



Couldn't this just be done as a do while?  It would probably be easier
to read and there wouldn't be any need for the another_round label anymore.

Or an infinite loop with a break at the bottom, as in:
	for (;;) {
		switch (...) {
		case again:
			continue;
		default:
			break;
		}
		break;
	}

	David


That is even more complicated.  What I was thinking was
	do {
		ret = __netif_receive_skb_ingress(skb, pfmemalloc,
						  orig_dev);
	} while (ret == __NET_RX_ANOTHER_ROUND);

Either that or the switch could just be replaced with a if statement since the only case that really goes anywhere is __NET_RX_ANOTHER_ROUND and everything else just exits anyway. I had just suggested a do/while since that lets the goto be dropped, but an if would allow for avoiding any unnecessary indentation on the call to __netif_receive_skb_ingress.

- Alex
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