linux-kernel - [PATCH 5.15 121/171] octeontx2-af: Fix LBK backpressure id count

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Message-Id: <20220131105234.134819720@linuxfoundation.org>
Date:   Mon, 31 Jan 2022 11:56:26 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sunil Goutham <sgoutham@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 121/171] octeontx2-af: Fix LBK backpressure id count

From: Sunil Goutham <sgoutham@...vell.com>

[ Upstream commit 00bfe94e388fe12bfd0d4f6361b1b1343374ff5b ]

In rvu_nix_get_bpid() lbk_bpid_cnt is being read from
wrong register. Due to this backpressure enable is failing
for LBK VF32 onwards. This patch fixes that.

Fixes: fe1939bb2340 ("octeontx2-af: Add SDP interface support")
Signed-off-by: Sunil Goutham <sgoutham@...vell.com>
Signed-off-by: Subbaraya Sundeep <sgoutham@...vell.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
index 6970540dc4709..8ee324aabf2d6 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
@@ -511,11 +511,11 @@ static int rvu_nix_get_bpid(struct rvu *rvu, struct nix_bp_cfg_req *req,
 	cfg = rvu_read64(rvu, blkaddr, NIX_AF_CONST);
 	lmac_chan_cnt = cfg & 0xFF;
 
-	cfg = rvu_read64(rvu, blkaddr, NIX_AF_CONST1);
-	sdp_chan_cnt = cfg & 0xFFF;
-
 	cgx_bpid_cnt = hw->cgx_links * lmac_chan_cnt;
 	lbk_bpid_cnt = hw->lbk_links * ((cfg >> 16) & 0xFF);
+
+	cfg = rvu_read64(rvu, blkaddr, NIX_AF_CONST1);
+	sdp_chan_cnt = cfg & 0xFFF;
 	sdp_bpid_cnt = hw->sdp_links * sdp_chan_cnt;
 
 	pfvf = rvu_get_pfvf(rvu, req->hdr.pcifunc);
-- 
2.34.1