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: 2f7f33a ("octeontx2-pf: Add representors for sdp MAC")
Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Geetha sowjanya

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)

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