From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Alex Elder <elder@linaro.org>
Cc: arnd@arndb.de, subashab@codeaurora.org, david.brown@linaro.org,
agross@kernel.org, davem@davemloft.net,
ilias.apalodimas@linaro.org, cpratapa@codeaurora.org,
syadagir@codeaurora.org, evgreen@chromium.org,
benchan@google.com, ejcaruso@google.com, netdev@vger.kernel.org,
linux-arm-msm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/8] net: qualcomm: rmnet: fix struct rmnet_map_header
Date: Mon, 20 May 2019 08:38:47 -0700 [thread overview]
Message-ID: <20190520153847.GP2085@tuxbook-pro> (raw)
In-Reply-To: <20190520135354.18628-2-elder@linaro.org>
On Mon 20 May 06:53 PDT 2019, Alex Elder wrote:
> The C bit-fields in the first byte of the rmnet_map_header structure
> are defined in the wrong order. The first byte should be formatted
> this way:
> +------- reserved_bit
> | +----- cd_bit
> | |
> v v
> +-----------+-+-+
> | pad_len |R|C|
> +-----------+-+-+
> 7 6 5 4 3 2 1 0 <-- bit position
>
> But the C bit-fields that define the first byte are defined this way:
> u8 pad_len:6;
> u8 reserved_bit:1;
> u8 cd_bit:1;
>
> And although this isn't portable, I can state that when I build it
> the result puts the bit-fields in the wrong location (e.g., the
> cd_bit is in bit position 7, when it should be position 0).
>
> Fix this by reordering the definitions of these struct members.
> Upcoming patches will reimplement these definitions portably.
>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Regards,
Bjorn
> Signed-off-by: Alex Elder <elder@linaro.org>
> ---
> drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
> index 884f1f52dcc2..b1ae9499c0b2 100644
> --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
> +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
> @@ -40,9 +40,9 @@ enum rmnet_map_commands {
> };
>
> struct rmnet_map_header {
> - u8 pad_len:6;
> - u8 reserved_bit:1;
> u8 cd_bit:1;
> + u8 reserved_bit:1;
> + u8 pad_len:6;
> u8 mux_id;
> __be16 pkt_len;
> } __aligned(1);
> --
> 2.20.1
>
next prev parent reply other threads:[~2019-05-20 15:38 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-20 13:53 [PATCH 0/8] net: introduce "include/linux/if_rmnet.h" Alex Elder
2019-05-20 13:53 ` [PATCH 1/8] net: qualcomm: rmnet: fix struct rmnet_map_header Alex Elder
2019-05-20 15:38 ` Bjorn Andersson [this message]
2019-05-20 20:11 ` Subash Abhinov Kasiviswanathan
2019-05-20 21:23 ` Alex Elder
2019-05-21 1:32 ` Subash Abhinov Kasiviswanathan
2019-05-21 2:30 ` Alex Elder
2019-05-21 3:07 ` Bjorn Andersson
2019-05-21 11:03 ` Alex Elder
2019-05-20 13:53 ` [PATCH 2/8] net: qualcomm: rmnet: kill RMNET_MAP_GET_*() accessor macros Alex Elder
2019-05-20 15:41 ` Bjorn Andersson
2019-05-20 13:53 ` [PATCH 3/8] net: qualcomm: rmnet: use field masks instead of C bit-fields Alex Elder
2019-05-20 15:43 ` Bjorn Andersson
2019-05-20 13:53 ` [PATCH 4/8] net: qualcomm: rmnet: don't use C bit-fields in rmnet checksum header Alex Elder
2019-05-20 15:49 ` Bjorn Andersson
2019-05-20 13:53 ` [PATCH 5/8] net: qualcomm: rmnet: don't use C bit-fields in rmnet checksum trailer Alex Elder
2019-05-20 17:17 ` Bjorn Andersson
2019-05-20 13:53 ` [PATCH 6/8] net: qualcomm: rmnet: get rid of a variable in rmnet_map_ipv4_ul_csum_header() Alex Elder
2019-05-20 17:17 ` Bjorn Andersson
2019-05-20 13:53 ` [PATCH 7/8] net: qualcomm: rmnet: mark endianness of struct rmnet_map_dl_csum_trailer fields Alex Elder
2019-05-20 17:17 ` Bjorn Andersson
2019-05-20 13:53 ` [PATCH 8/8] net: introduce "include/linux/if_rmnet.h" Alex Elder
2019-05-20 17:18 ` Bjorn Andersson
2019-05-20 18:00 ` [PATCH 0/8] " Alex Elder
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