From: Alex Elder <elder@linaro.org>
Date: Mon, 15 Mar 2021 21:51:50 +0000 (-0500)
Subject: net: qualcomm: rmnet: don't use C bit-fields in rmnet checksum trailer
X-Git-Tag: accepted/tizen/unified/20230118.172025~7335^2~536^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cc1b21ba6251c8dd8e4e86018c9fdba85df0d219;p=platform%2Fkernel%2Flinux-rpi.git

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 one-byte field, using constant field masks
to encode or get at embedded values.

Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
index e7d0394..c336c17 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
@@ -359,7 +359,7 @@ 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 (!(csum_trailer->flags & MAP_CSUM_DL_VALID_FLAG)) {
 		priv->stats.csum_valid_unset++;
 		return -EINVAL;
 	}
diff --git a/include/linux/if_rmnet.h b/include/linux/if_rmnet.h
index a02f0a3..941997d 100644
--- a/include/linux/if_rmnet.h
+++ b/include/linux/if_rmnet.h
@@ -19,21 +19,18 @@ struct rmnet_map_header {
 #define MAP_CMD_FLAG			BIT(7)
 
 struct rmnet_map_dl_csum_trailer {
-	u8  reserved1;
-#if defined(__LITTLE_ENDIAN_BITFIELD)
-	u8  valid:1;
-	u8  reserved2:7;
-#elif defined (__BIG_ENDIAN_BITFIELD)
-	u8  reserved2:7;
-	u8  valid:1;
-#else
-#error	"Please fix <asm/byteorder.h>"
-#endif
+	u8 reserved1;
+	u8 flags;			/* MAP_CSUM_DL_VALID_FLAG */
 	__be16 csum_start_offset;
 	__be16 csum_length;
 	__be16 csum_value;
 } __aligned(1);
 
+/* rmnet_map_dl_csum_trailer flags field:
+ *  VALID:	1 = checksum and length valid; 0 = ignore them
+ */
+#define MAP_CSUM_DL_VALID_FLAG		BIT(0)
+
 struct rmnet_map_ul_csum_header {
 	__be16 csum_start_offset;
 #if defined(__LITTLE_ENDIAN_BITFIELD)