Patch "octeontx2-af: Fix max NPC MCAM entry check while validating ref_entry" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    octeontx2-af: Fix max NPC MCAM entry check while validating ref_entry

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     octeontx2-af-fix-max-npc-mcam-entry-check-while-vali.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit a4dbca49e369eb4b566ca4748fc871e1e62e7115
Author: Suman Ghosh <sumang@xxxxxxxxxxx>
Date:   Mon Jan 1 20:20:42 2024 +0530

    octeontx2-af: Fix max NPC MCAM entry check while validating ref_entry
    
    [ Upstream commit 4ebb1f95e0c3c3e0eec5bb21aa43097580c4b6e4 ]
    
    As of today, the last MCAM entry was not getting allocated because of
    a <= check with the max_bmap count. This patch modifies that and if the
    requested entry is greater than the available entries then set it to the
    max value.
    
    Signed-off-by: Suman Ghosh <sumang@xxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20240101145042.419697-1-sumang@xxxxxxxxxxx
    Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
index 0bcf3e559280..3784347b6fd8 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
@@ -2678,18 +2678,17 @@ int rvu_mbox_handler_npc_mcam_alloc_entry(struct rvu *rvu,
 	rsp->entry = NPC_MCAM_ENTRY_INVALID;
 	rsp->free_count = 0;
 
-	/* Check if ref_entry is within range */
-	if (req->priority && req->ref_entry >= mcam->bmap_entries) {
-		dev_err(rvu->dev, "%s: reference entry %d is out of range\n",
-			__func__, req->ref_entry);
-		return NPC_MCAM_INVALID_REQ;
-	}
+	/* Check if ref_entry is greater that the range
+	 * then set it to max value.
+	 */
+	if (req->ref_entry > mcam->bmap_entries)
+		req->ref_entry = mcam->bmap_entries;
 
 	/* ref_entry can't be '0' if requested priority is high.
 	 * Can't be last entry if requested priority is low.
 	 */
 	if ((!req->ref_entry && req->priority == NPC_MCAM_HIGHER_PRIO) ||
-	    ((req->ref_entry == (mcam->bmap_entries - 1)) &&
+	    ((req->ref_entry == mcam->bmap_entries) &&
 	     req->priority == NPC_MCAM_LOWER_PRIO))
 		return NPC_MCAM_INVALID_REQ;