From: Shai Malin <smalin@marvell.com>
Date: Sun, 22 Aug 2021 19:21:14 +0000 (+0300)
Subject: qed: Fix the VF msix vectors flow
X-Git-Tag: v5.13.15~20
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9bf0c451fc8539f6561f2258285171535b49bceb;p=thirdparty%2Fkernel%2Fstable.git

qed: Fix the VF msix vectors flow

[ Upstream commit b0cd08537db8d2fbb227cdb2e5835209db295a24 ]

For VFs we should return with an error in case we didn't get the exact
number of msix vectors as we requested.
Not doing that will lead to a crash when starting queues for this VF.

Signed-off-by: Prabhakar Kushwaha <pkushwaha@marvell.com>
Signed-off-by: Ariel Elior <aelior@marvell.com>
Signed-off-by: Shai Malin <smalin@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/net/ethernet/qlogic/qed/qed_main.c b/drivers/net/ethernet/qlogic/qed/qed_main.c
index 5bd58c65e1631..6bb9ec98a12b5 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_main.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_main.c
@@ -616,7 +616,12 @@ static int qed_enable_msix(struct qed_dev *cdev,
 			rc = cnt;
 	}
 
-	if (rc > 0) {
+	/* For VFs, we should return with an error in case we didn't get the
+	 * exact number of msix vectors as we requested.
+	 * Not doing that will lead to a crash when starting queues for
+	 * this VF.
+	 */
+	if ((IS_PF(cdev) && rc > 0) || (IS_VF(cdev) && rc == cnt)) {
 		/* MSI-x configuration was achieved */
 		int_params->out.int_mode = QED_INT_MODE_MSIX;
 		int_params->out.num_vectors = rc;