[PATCH 4.14 119/135] qed: Consider TX tcs while deriving the max num_queues for PF.

From: Greg Kroah-Hartman
Date: Tue Mar 12 2019 - 13:35:25 EST


4.14-stable review patch. If anyone has any objections, please let me know.

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[ Upstream commit fb1faab74ddef9ec2d841d54e5d0912a097b3abe ]

Max supported queues is derived incorrectly in the case of multi-CoS.
Need to consider TCs while calculating num_queues for PF.

Signed-off-by: Sudarsana Reddy Kalluru <skalluru@xxxxxxxxxxx>
Signed-off-by: Ariel Elior <aelior@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/ethernet/qlogic/qed/qed_l2.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_l2.c b/drivers/net/ethernet/qlogic/qed/qed_l2.c
index 4ffdde755db7..62cde3854a5c 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_l2.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_l2.c
@@ -2170,7 +2170,7 @@ static int qed_fill_eth_dev_info(struct qed_dev *cdev,
u16 num_queues = 0;

/* Since the feature controls only queue-zones,
- * make sure we have the contexts [rx, tx, xdp] to
+ * make sure we have the contexts [rx, xdp, tcs] to
* match.
*/
for_each_hwfn(cdev, i) {
@@ -2180,7 +2180,8 @@ static int qed_fill_eth_dev_info(struct qed_dev *cdev,
u16 cids;

cids = hwfn->pf_params.eth_pf_params.num_cons;
- num_queues += min_t(u16, l2_queues, cids / 3);
+ cids /= (2 + info->num_tc);
+ num_queues += min_t(u16, l2_queues, cids);
}

/* queues might theoretically be >256, but interrupts'
--
2.19.1