netdev - [net PATCH] octeontx2-af: Fix SDP MAC link credits configuration

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Message-ID: <20241126114431.3639-1-gakula@marvell.com>
Date: Tue, 26 Nov 2024 17:14:31 +0530
From: Geetha sowjanya <gakula@...vell.com>
To: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <kuba@...nel.org>, <davem@...emloft.net>, <pabeni@...hat.com>,
        <horms@...nel.org>, <andrew+netdev@...n.ch>, <edumazet@...gle.com>,
        <sgoutham@...vell.com>, <gakula@...vell.com>, <sbhatta@...vell.com>,
        <hkelam@...vell.com>
Subject: [net PATCH] octeontx2-af: Fix SDP MAC link credits configuration

Current driver allows only packet size < 512B as SDP_LINK_CREDIT
register is set to default value. 
This patch fixes this issue by configure the register with 
maximum HW supported value to allow packet size > 512B.

Fixes: 2f7f33a09516 ("octeontx2-pf: Add representors for sdp MAC")
Signed-off-by: Geetha sowjanya <gakula@...vell.com>
---
 drivers/net/ethernet/marvell/octeontx2/af/common.h  | 1 +
 drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/common.h b/drivers/net/ethernet/marvell/octeontx2/af/common.h
index 5d84386ed22d..406c59100a35 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/common.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/common.h
@@ -159,6 +159,7 @@ enum nix_scheduler {
 #define	SDP_HW_MIN_FRS			16
 #define CN10K_LMAC_LINK_MAX_FRS		16380 /* 16k - FCS */
 #define CN10K_LBK_LINK_MAX_FRS		65535 /* 64k */
+#define SDP_LINK_CREDIT			0x320202
 
 /* NIX RX action operation*/
 #define NIX_RX_ACTIONOP_DROP		(0x0ull)
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
index 5d5a01dbbca1..a5d1e2bddd58 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
@@ -4672,6 +4672,9 @@ static void nix_link_config(struct rvu *rvu, int blkaddr,
 	rvu_get_lbk_link_max_frs(rvu, &lbk_max_frs);
 	rvu_get_lmac_link_max_frs(rvu, &lmac_max_frs);
 
+	/* Set SDP link credit */
+	rvu_write64(rvu, blkaddr, NIX_AF_SDP_LINK_CREDIT, SDP_LINK_CREDIT);
+
 	/* Set default min/max packet lengths allowed on NIX Rx links.
 	 *
 	 * With HW reset minlen value of 60byte, HW will treat ARP pkts
-- 
2.25.1