linux-kernel - [PATCH AUTOSEL for 4.15 034/102] net: thunderx: Set max queue count taking XDP

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Message-ID: <20180303222318.26006-34-alexander.levin@microsoft.com>
Date:   Sat, 3 Mar 2018 22:24:29 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Sunil Goutham <sgoutham@...ium.com>,
        cjacob <cjacob@...iumnetworks.com>,
        Aleksey Makarov <aleksey.makarov@...ium.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.15 034/102] net: thunderx: Set max queue count
 taking XDP_TX into account

From: Sunil Goutham <sgoutham@...ium.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@...ium.com>
Signed-off-by: cjacob <cjacob@...iumnetworks.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@...ium.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/net/ethernet/cavium/thunder/nicvf_main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
index a063c36c4c58..3e6286d402ef 100644
--- 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 *pdev, const struct pci_device_id *ent)
 	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);
-- 
2.14.1