[PATCH 3/3] can: uapi: can.h: suppress padding of union inside struct can_frame

In commit ea7800565a12 ("can: add optional DLC element to Classical
CAN frame structure") the struct can_frame::can_dlc was put into an
anonymous union with another u8 variable.

For various reasons some members in struct can_frame and canfd_frame
including the first 8 byes of data are expected to have the same
memory layout. This is enforced by a BUILD_BUG_ON check in af_can.c.

Since the above mentioned commit this check fails on some compilers
(e.g. arm-linux-gnueabi-gcc (GCC) 9.3.0) that apply an alignment on
an (anonymous) union (see Link). Rong Chen analyzed the problem and
found that the union in struct can_frame takes 4 bytes instead of
the expected 1:

| struct can_frame {
|          canid_t                    can_id;               /* 0     4 */
|          union {
|                  __u8               len;                  /* 4     1 */
|                  __u8               can_dlc;              /* 4     1 */
|          };                                               /* 4     4 */
|          __u8                       __pad;                /* 8     1 */
|          __u8                       __res0;               /* 9     1 */
|          __u8                       len8_dlc;             /* 10     1 */
|
|          /* XXX 5 bytes hole, try to pack */
|
|          __u8                       data[8]
| __attribute__((__aligned__(8))); /*    16     8 */
|
|          /* size: 24, cachelines: 1, members: 6 */
|          /* sum members: 19, holes: 1, sum holes: 5 */
|          /* forced alignments: 1, forced holes: 1, sum forced holes: 5 */
|          /* last cacheline: 24 bytes */
| } __attribute__((__aligned__(8)));

Marking the anonymous union as __attribute__((packed)) fixes the
BUILD_BUG_ON problem on these compilers.

Fixes: ea7800565a12 ("can: add optional DLC element to Classical CAN frame structure")
Link: https://lore.kernel.org/linux-can/2c82ec23-3551-61b5-1bd8-178c3407ee83@hartkopp.net/ (local)
Suggested-by: Rong Chen <redacted>
Reported-by: kernel test robot <redacted>
Author: Marc Kleine-Budde [off-list ref]
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
---
 include/uapi/linux/can.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/can.h b/include/uapi/linux/can.h
index f75238ac6dce..56abe9b50561 100644
--- a/include/uapi/linux/can.h
+++ b/include/uapi/linux/can.h

@@ -111,11 +111,11 @@ struct can_frame {
 		 * was previously named can_dlc so we need to carry that
 		 * name for legacy support
 		 */
 		__u8 len;
 		__u8 can_dlc; /* deprecated */
-	};
+	} __attribute__((packed)); /* disable padding by some compilers */
 	__u8 __pad; /* padding */
 	__u8 __res0; /* reserved / padding */
 	__u8 len8_dlc; /* optional DLC for 8 byte payload length (9 .. 15) */
 	__u8 data[CAN_MAX_DLEN] __attribute__((aligned(8)));
 };

-- 
2.30.2