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%3Ba=su...
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