linux-kernel - [PATCH 5/8] net: qualcomm: rmnet: don't use C bit-fields in rmnet checksum trailer

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Date:   Mon, 20 May 2019 08:53:51 -0500
From:   Alex Elder <elder@...aro.org>
To:     arnd@...db.de, subashab@...eaurora.org, david.brown@...aro.org,
        agross@...nel.org, davem@...emloft.net
Cc:     bjorn.andersson@...aro.org, ilias.apalodimas@...aro.org,
        cpratapa@...eaurora.org, syadagir@...eaurora.org,
        evgreen@...omium.org, benchan@...gle.com, ejcaruso@...gle.com,
        netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/8] net: qualcomm: rmnet: don't use C bit-fields in rmnet checksum trailer

Replace the use of C bit-fields in the rmnet_map_dl_csum_trailer
structure with a single integral field, using field masks to
encode or get at sub-field values.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h      | 6 ++++--
 drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
index f3231c26badd..fb1cdb4ec41f 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
@@ -51,13 +51,15 @@ struct rmnet_map_header {
 
 struct rmnet_map_dl_csum_trailer {
 	u8  reserved1;
-	u8  valid:1;
-	u8  reserved2:7;
+	u8  flags;		/* RMNET_MAP_DL_* */
 	u16 csum_start_offset;
 	u16 csum_length;
 	__be16 csum_value;
 } __aligned(1);
 
+#define RMNET_MAP_DL_CSUM_VALID_FMASK	GENMASK(0, 0)
+#define RMNET_MAP_DL_RESERVED_FMASK	GENMASK(7, 1)
+
 struct rmnet_map_ul_csum_header {
 	__be16 csum_start_offset;
 	__be16 csum_info;	/* RMNET_MAP_UL_* */
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
index 72b64114505a..a95111cdcd29 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
@@ -362,7 +362,7 @@ int rmnet_map_checksum_downlink_packet(struct sk_buff *skb, u16 len)
 
 	csum_trailer = (struct rmnet_map_dl_csum_trailer *)(skb->data + len);
 
-	if (!csum_trailer->valid) {
+	if (!u8_get_bits(csum_trailer->flags, RMNET_MAP_DL_CSUM_VALID_FMASK)) {
 		priv->stats.csum_valid_unset++;
 		return -EINVAL;
 	}
-- 
2.20.1