Hello!
On 1/24/24 1:21 PM, Biju Das wrote:
> This patch series aims to add HW checksum offload supported by TOE module
> found on the RZ/G2L Gb ethernet IP.
Your previous try was back in 2021, still the cover letter has the same
issues (hm, I didn't point out those back then).
> The TOE has hw support for calculating IP header and TCP/UDP/ICMP checksum
> for both IPV4 and IPV6.
>
> For Rx, the result of checksum calculation is attached to last 4byte
> of ethernet frames.
"For Rx, the 4-byte result of checksum calculation is attached to the
Ethernet frames", you wanted to say?
> First 2bytes is result of IPV4 header checksum
> and next 2 bytes is TCP/UDP/ICMP.
TCP/UDP/ICMP checksum, you mean?
> If frame does not have error "0000" attached to checksum calculation
"If a frame does not have checksum error, 0x0000 is attached as
a checksum calculation result", you wanted to say?
> result. For unsupported frames "ffff" is attached to checksum calculation
s/to/as/, again?
> result. Cases like IPV6, IPV4 header is always set to "FFFF".
In case of an IPv6 packet, IPv4 checksum is always set to 0xFFFF",
you wanted to say?
> For Tx, the result of checksum calculation is set to the checksum field of
> each IPv4 Header/TCP/UDP/ICMP of ethernet frames. For the unsupported
> frames, those fields are not changed. If a transmission frame is an UDP
> frame of IPv4 and its checksum value in the UDP header field is H’0000,
I think you can call it just UDPv4...
> TOE does not calculate checksum for UDP part of this frame as it is
> optional function as per standards.
>
> Add Tx/Rx checksum offload supported by TOE for IPV4 and TCP/UDP protocols.
>
> Results of iperf3 in Mbps
>
> RZ/V2L:
> TCP(Tx/Rx) results with checksum offload Enabled: {921,932}
> TCP(Tx/Rx) results with checksum offload Disabled: {867,612}
>
> UDP(Tx/Rx) results with checksum offload Enabled: {950,946}
> UDP(Tx/Rx) results with checksum offload Disabled: {952,920}
>
> RZ/G2L:
> TCP(Tx/Rx) results with checksum offload Enabled: {920,936}
> TCP(Tx/Rx) results with checksum offload Disabled: {871,626}
>
> UDP(Tx/Rx) results with checksum offload Enabled: {953,950}
> UDP(Tx/Rx) results with checksum offload Disabled: {954,920}
>
> RZ/G2LC:
> TCP(Tx/Rx) results with checksum offload Enabled: {927,936}
> TCP(Tx/Rx) results with checksum offload Disabled: {889,626}
>
> UDP(Tx/Rx) results with checksum offload Enabled: {950,946}
> UDP(Tx/Rx) results with checksum offload Disabled: {949,944}
Too many figures, I think... :-)
How RZ/G2L SoC is different from RZ/G2LC?
> v1->v2:
> * Updated covering letter and results
> * Fixed the sparse warnings for patch#1 by replacing __sum16->__wsum.
>
> Note:
> This patches are tested with [1] without the CPU performance is not good
Without CPU? I guess the performance would be 0. Seriously, this is
hardly parseable... :-)
> [1] https://lore.kernel.org/all/20240117190545.596057-1-vincent.guittot@xxxxxxxxxx/
>
> Biju Das (2):
> ravb: Add Rx checksum offload support
> ravb: Add Tx checksum offload support
These summaries sound like you're adding checksum offload support for
all supported SoCs while you only do that for those having GbEther...
[...]
MBR, Sergey
