linux-kernel - [net-next] Octeontx2-af: Fix an issue in firmware shared data reserved space

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Date: Fri, 1 Mar 2024 16:33:14 +0530
From: Hariprasad Kelam <hkelam@...vell.com>
To: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <kuba@...nel.org>, <davem@...emloft.net>, <sgoutham@...vell.com>,
        <gakula@...vell.com>, <jerinj@...vell.com>, <lcherian@...vell.com>,
        <sbhatta@...vell.com>, <hkelam@...vell.com>, <naveenm@...vell.com>,
        <edumazet@...gle.com>, <pabeni@...hat.com>
Subject: [net-next] Octeontx2-af: Fix an issue in firmware shared data reserved space

The last patch which added support to extend the firmware shared
data to add channel data information has introduced a bug due to
the reserved space not adjusted accordingly.

This patch fixes the issue and also adds BUILD_BUG to avoid this
regression error.

Fixes: 997814491cee ("Octeontx2-af: Fetch MAC channel info from firmware")
Signed-off-by: Hariprasad Kelam <hkelam@...vell.com>
---
 drivers/net/ethernet/marvell/octeontx2/af/rvu.c | 2 ++
 drivers/net/ethernet/marvell/octeontx2/af/rvu.h | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
index edd12d09dc89..07d4859de53a 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 de8eba902276..f390525a6217 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];
-- 
2.17.1