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Subject[PATCH 4.14 049/109] net: thunderx: Set max queue count taking XDP_TX into account
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

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

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
@@ -1832,6 +1832,11 @@ 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);

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