Patch "net: thunderx: Set max queue count taking XDP_TX into account" has been added to the 4.15-stable tree

Patch "net: thunderx: Set max queue count taking XDP_TX into account" has been added to the 4.15-stable tree

[gregkh]

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

    net: thunderx: Set max queue count taking XDP_TX into account

to the 4.15-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:
     net-thunderx-set-max-queue-count-taking-xdp_tx-into-account.patch
and it can be found in the queue-4.15 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 Fri Mar 16 15:11:07 CET 2018
From: Sunil Goutham <sgoutham@cavium.com>
Date: Fri, 24 Nov 2017 15:04:03 +0300
Subject: net: thunderx: Set max queue count taking XDP_TX into account

From: Sunil Goutham <sgoutham@cavium.com>


[ Upstream commit 87de083857aa269fb171ef0b39696b2888361c58 ]

on T81 there are only 4 cores, hence setting max queue count to 4
would leave nothing for XDP_TX. This patch fixes this by doubling
max queue count in above scenarios.

Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: cjacob <cjacob@caviumnetworks.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/cavium/thunder/nicvf_main.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
@@ -1833,6 +1833,11 @@ static int nicvf_probe(struct pci_dev *p
 	nic->pdev = pdev;
 	nic->pnicvf = nic;
 	nic->max_queues = qcount;
+	/* If no of CPUs are too low, there won't be any queues left
+	 * for XDP_TX, hence double it.
+	 */
+	if (!nic->t88)
+		nic->max_queues *= 2;
 
 	/* MAP VF's configuration registers */
 	nic->reg_base = pcim_iomap(pdev, PCI_CFG_REG_BAR_NUM, 0);


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

queue-4.15/net-thunderx-set-max-queue-count-taking-xdp_tx-into-account.patch