diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
index edd12d09dc89a..07d4859de53ad 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
@@ -817,6 +817,8 @@ static int rvu_fwdata_init(struct rvu *rvu)
 	err = cgx_get_fwdata_base(&fwdbase);
 	if (err)
 		goto fail;
+
+	BUILD_BUG_ON(offsetof(struct rvu_fwdata, cgx_fw_data) > FWDATA_CGX_LMAC_OFFSET);
 	rvu->fwdata = ioremap_wc(fwdbase, sizeof(struct rvu_fwdata));
 	if (!rvu->fwdata)
 		goto fail;
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu.h b/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
index de8eba9022764..f390525a62177 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
@@ -469,11 +469,12 @@ struct rvu_fwdata {
 	u32 ptp_ext_clk_rate;
 	u32 ptp_ext_tstamp;
 	struct channel_fwdata channel_data;
-#define FWDATA_RESERVED_MEM 1014
+#define FWDATA_RESERVED_MEM 958
 	u64 reserved[FWDATA_RESERVED_MEM];
 #define CGX_MAX         9
 #define CGX_LMACS_MAX   4
 #define CGX_LMACS_USX   8
+#define FWDATA_CGX_LMAC_OFFSET 10536
 	union {
 		struct cgx_lmac_fwdata_s
 			cgx_fw_data[CGX_MAX][CGX_LMACS_MAX];