Patch "octeontx2-af: Fix CPT AF register offset calculation" has been added to the 6.1-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 CPT AF register offset calculation

to the 6.1-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-cpt-af-register-offset-calculation.patch
and it can be found in the queue-6.1 subdirectory.

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



commit a7f7c192846359f2b51d78a4606537ef1909dbcc
Author: Bharat Bhushan <bbhushan2@xxxxxxxxxxx>
Date:   Wed Aug 21 12:35:58 2024 +0530

    octeontx2-af: Fix CPT AF register offset calculation
    
    [ Upstream commit af688a99eb1fc7ef69774665d61e6be51cea627a ]
    
    Some CPT AF registers are per LF and others are global. Translation
    of PF/VF local LF slot number to actual LF slot number is required
    only for accessing perf LF registers. CPT AF global registers access
    do not require any LF slot number. Also, there is no reason CPT
    PF/VF to know actual lf's register offset.
    
    Without this fix microcode loading will fail, VFs cannot be created
    and hardware is not usable.
    
    Fixes: bc35e28af789 ("octeontx2-af: replace cpt slot with lf id on reg write")
    Signed-off-by: Bharat Bhushan <bbhushan2@xxxxxxxxxxx>
    Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
    Link: https://patch.msgid.link/20240821070558.1020101-1-bbhushan2@xxxxxxxxxxx
    Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cpt.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cpt.c
index b226a4d376aab..160e044c25c24 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cpt.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cpt.c
@@ -632,7 +632,9 @@ int rvu_mbox_handler_cpt_inline_ipsec_cfg(struct rvu *rvu,
 	return ret;
 }
 
-static bool is_valid_offset(struct rvu *rvu, struct cpt_rd_wr_reg_msg *req)
+static bool validate_and_update_reg_offset(struct rvu *rvu,
+					   struct cpt_rd_wr_reg_msg *req,
+					   u64 *reg_offset)
 {
 	u64 offset = req->reg_offset;
 	int blkaddr, num_lfs, lf;
@@ -663,6 +665,11 @@ static bool is_valid_offset(struct rvu *rvu, struct cpt_rd_wr_reg_msg *req)
 		if (lf < 0)
 			return false;
 
+		/* Translate local LF's offset to global CPT LF's offset to
+		 * access LFX register.
+		 */
+		*reg_offset = (req->reg_offset & 0xFF000) + (lf << 3);
+
 		return true;
 	} else if (!(req->hdr.pcifunc & RVU_PFVF_FUNC_MASK)) {
 		/* Registers that can be accessed from PF */
@@ -697,7 +704,7 @@ int rvu_mbox_handler_cpt_rd_wr_register(struct rvu *rvu,
 					struct cpt_rd_wr_reg_msg *rsp)
 {
 	u64 offset = req->reg_offset;
-	int blkaddr, lf;
+	int blkaddr;
 
 	blkaddr = validate_and_get_cpt_blkaddr(req->blkaddr);
 	if (blkaddr < 0)
@@ -708,18 +715,10 @@ int rvu_mbox_handler_cpt_rd_wr_register(struct rvu *rvu,
 	    !is_cpt_vf(rvu, req->hdr.pcifunc))
 		return CPT_AF_ERR_ACCESS_DENIED;
 
-	if (!is_valid_offset(rvu, req))
+	if (!validate_and_update_reg_offset(rvu, req, &offset))
 		return CPT_AF_ERR_ACCESS_DENIED;
 
-	/* Translate local LF used by VFs to global CPT LF */
-	lf = rvu_get_lf(rvu, &rvu->hw->block[blkaddr], req->hdr.pcifunc,
-			(offset & 0xFFF) >> 3);
-
-	/* Translate local LF's offset to global CPT LF's offset */
-	offset &= 0xFF000;
-	offset += lf << 3;
-
-	rsp->reg_offset = offset;
+	rsp->reg_offset = req->reg_offset;
 	rsp->ret_val = req->ret_val;
 	rsp->is_write = req->is_write;