Patch "bnx2x: Fix Multi-Cos" has been added to the 3.18-stable tree

Patch "bnx2x: Fix Multi-Cos" has been added to the 3.18-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    bnx2x: Fix Multi-Cos

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     bnx2x-fix-multi-cos.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Jun  8 09:17:40 CEST 2017
From: "Mintz, Yuval" <Yuval.Mintz@cavium.com>
Date: Thu, 1 Jun 2017 15:57:56 +0300
Subject: bnx2x: Fix Multi-Cos

From: "Mintz, Yuval" <Yuval.Mintz@cavium.com>


[ Upstream commit 3968d38917eb9bd0cd391265f6c9c538d9b33ffa ]

Apparently multi-cos isn't working for bnx2x quite some time -
driver implements ndo_select_queue() to allow queue-selection
for FCoE, but the regular L2 flow would cause it to modulo the
fallback's result by the number of queues.
The fallback would return a queue matching the needed tc
[via __skb_tx_hash()], but since the modulo is by the number of TSS
queues where number of TCs is not accounted, transmission would always
be done by a queue configured into using TC0.

Fixes: ada7c19e6d27 ("bnx2x: use XPS if possible for bnx2x_select_queue instead of pure hash")
Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -1929,7 +1929,7 @@ u16 bnx2x_select_queue(struct net_device
 	}
 
 	/* select a non-FCoE queue */
-	return fallback(dev, skb) % BNX2X_NUM_ETH_QUEUES(bp);
+	return fallback(dev, skb) % (BNX2X_NUM_ETH_QUEUES(bp) * bp->max_cos);
 }
 
 void bnx2x_set_num_queues(struct bnx2x *bp)


Patches currently in stable-queue which might be from Yuval.Mintz@cavium.com are

queue-3.18/bnx2x-fix-multi-cos.patch