netdev - Re: [PATCH net-next v4 0/3] net: qualcomm: rmnet: Enable Mapv5

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Date:   Fri, 23 Apr 2021 07:31:58 -0500
From:   Alex Elder <elder@...aro.org>
To:     Sharath Chandra Vurukala <sharathv@...eaurora.org>,
        davem@...emloft.net, kuba@...nel.org, elder@...nel.org,
        cpratapa@...eaurora.org, subashab@...eaurora.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v4 0/3] net: qualcomm: rmnet: Enable Mapv5

On 4/22/21 3:02 PM, Sharath Chandra Vurukala wrote:
> This series introduces the MAPv5 packet format.
> 
>    Patch 0 documents the MAPv4/v5.
>    Patch 1 introduces the MAPv5 and the Inline checksum offload for RX/Ingress.
>    Patch 2 introduces the MAPv5 and the Inline checksum offload for TX/Egress.
> 
>    A new checksum header format is used as part of MAPv5.For RX checksum offload,
>    the checksum is verified by the HW and the validity is marked in the checksum
>    header of MAPv5. For TX, the required metadata is filled up so hardware can
>    compute the checksum.

It turns out many of review comments from last week were
ignored without explanation.  So I will repeat some of them
this time.

I see one thing that I think might be a bug in the third
patch, but maybe I'm mistaken, and you can explain why.

I tested the code you supplied me last week, and with a
bug fix applied I found they worked for:
   IPA v3.5.1, IPv4 in loopback, checksum enabled and not
   IPA v4.2, IPv6 using LTE, checksum enabled and not
Both of the above tested ICMP, UDP, and TCP.  I will retest
with this series.

I did not test with IPA v4.5+, which is unfortunately
the main user of this new code.  I will try to do so
with your updated code, and if all testing passes I'll
send a message with "Tested-by" for you to add to your
patches.

					-Alex

>    v1->v2:
>    - Fixed the compilation errors, warnings reported by kernel test robot.
>    - Checksum header definition is expanded to support big, little endian
>            formats as mentioned by Jakub.
> 
>    v2->v3:
>    - Fixed compilation errors reported by kernel bot for big endian flavor.
> 
>    v3->v4:
>    - Made changes to use masks instead of C bit-fields as suggested by Jakub/Alex.
> 
> Sharath Chandra Vurukala (3):
>    docs: networking: Add documentation for MAPv5
>    net: ethernet: rmnet: Support for ingress MAPv5 checksum offload
>    net: ethernet: rmnet: Add support for MAPv5 egress packets
> 
>   .../device_drivers/cellular/qualcomm/rmnet.rst     | 126 +++++++++++++++--
>   drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h |   4 +-
>   .../net/ethernet/qualcomm/rmnet/rmnet_handlers.c   |  29 ++--
>   drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h    |  11 +-
>   .../net/ethernet/qualcomm/rmnet/rmnet_map_data.c   | 151 ++++++++++++++++++++-
>   drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c    |   3 +-
>   include/linux/if_rmnet.h                           |  27 +++-
>   include/uapi/linux/if_link.h                       |   2 +
>   8 files changed, 318 insertions(+), 35 deletions(-)
>