linux-kernel - [PATCH 3.16 019/370] enic: set skb->hash type properly

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Date:   Fri, 10 Mar 2017 11:46:22 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Govindarajulu Varadarajan" <_govind@....com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 019/370] enic: set skb->hash type properly

3.16.42-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Govindarajulu Varadarajan <_govind@....com>

commit 17197236d62c44da127be461c63ac5cc2cce1e53 upstream.

Driver sets the skb l4/l3 hash based on NIC_CFG_RSS_HASH_TYPE_*,
which is bit mask. This is wrong. Hw actually provides us enum.
Use CQ_ENET_RQ_DESC_RSS_TYPE_* to set l3 and l4 hash type.

Fixes: bf751ba802fe ("driver/net: enic: record q_number and rss_hash for skb")
Signed-off-by: Govindarajulu Varadarajan <_govind@....com>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 3.16: drop the version bump]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/net/ethernet/cisco/enic/enic_main.c
+++ b/drivers/net/ethernet/cisco/enic/enic_main.c
@@ -1033,12 +1033,18 @@ static void enic_rq_indicate_buf(struct
 		skb->protocol = eth_type_trans(skb, netdev);
 		skb_record_rx_queue(skb, q_number);
 		if (netdev->features & NETIF_F_RXHASH) {
-			skb_set_hash(skb, rss_hash,
-				     (rss_type &
-				      (NIC_CFG_RSS_HASH_TYPE_TCP_IPV6_EX |
-				       NIC_CFG_RSS_HASH_TYPE_TCP_IPV6 |
-				       NIC_CFG_RSS_HASH_TYPE_TCP_IPV4)) ?
-				     PKT_HASH_TYPE_L4 : PKT_HASH_TYPE_L3);
+			switch (rss_type) {
+			case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv4:
+			case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv6:
+			case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv6_EX:
+				skb_set_hash(skb, rss_hash, PKT_HASH_TYPE_L4);
+				break;
+			case CQ_ENET_RQ_DESC_RSS_TYPE_IPv4:
+			case CQ_ENET_RQ_DESC_RSS_TYPE_IPv6:
+			case CQ_ENET_RQ_DESC_RSS_TYPE_IPv6_EX:
+				skb_set_hash(skb, rss_hash, PKT_HASH_TYPE_L3);
+				break;
+			}
 		}
 
 		/* Hardware does not provide whole packet checksum. It only