From: Suman Ghosh <sumang@marvell.com>
Date: Wed, 23 Nov 2022 16:29:38 +0530
Subject: octeontx2-pf: Fix pfc_alloc_status array overflow
Patch-mainline: v6.1-rc8
Git-commit: 32b931c86d0aef4f3263de457f58d82e9cbae2a2
References: jsc#SLE-24682

This patch addresses pfc_alloc_status array overflow occurring for
send queue index value greater than PFC priority. Queue index can be
greater than supported PFC priority for multiple scenarios (e.g. QoS,
during non zero SMQ allocation for a PF/VF).
In those scenarios the API should return default tx scheduler '0'.
This is causing mbox errors as otx2_get_smq_idx returing invalid smq value.

Fixes: 99c969a83d82 ("octeontx2-pf: Add egress PFC support")
Signed-off-by: Suman Ghosh <sumang@marvell.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
@@ -804,7 +804,7 @@ static inline void otx2_dma_unmap_page(s
 static inline u16 otx2_get_smq_idx(struct otx2_nic *pfvf, u16 qidx)
 {
 #ifdef CONFIG_DCB
-	if (pfvf->pfc_alloc_status[qidx])
+	if (qidx < NIX_PF_PFC_PRIO_MAX && pfvf->pfc_alloc_status[qidx])
 		return pfvf->pfc_schq_list[NIX_TXSCH_LVL_SMQ][qidx];
 #endif