RE: [PATCH v3 net-next 4/5] net: enetc: add LSO support for i.MX95 ENETC PF

[Claudiu Manoil]

> -----Original Message-----
> From: Wei Fang <wei.fang@xxxxxxx>
> Sent: Tuesday, November 12, 2024 11:15 AM
[...]
> Subject: [PATCH v3 net-next 4/5] net: enetc: add LSO support for i.MX95
> ENETC PF
> 
> ENETC rev 4.1 supports large send offload (LSO), segmenting large TCP
> and UDP transmit units into multiple Ethernet frames. To support LSO,
> software needs to fill some auxiliary information in Tx BD, such as LSO
> header length, frame length, LSO maximum segment size, etc.
> 
> At 1Gbps link rate, TCP segmentation was tested using iperf3, and the
> CPU performance before and after applying the patch was compared through
> the top command. It can be seen that LSO saves a significant amount of
> CPU cycles compared to software TSO.
> 
> Before applying the patch:
> %Cpu(s):  0.1 us,  4.1 sy,  0.0 ni, 85.7 id,  0.0 wa,  0.5 hi,  9.7 si
> 
> After applying the patch:
> %Cpu(s):  0.1 us,  2.3 sy,  0.0 ni, 94.5 id,  0.0 wa,  0.4 hi,  2.6 si
> 
> Signed-off-by: Wei Fang <wei.fang@xxxxxxx>
> Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
> ---
> v2: no changes
> v3: use enetc_skb_is_ipv6() helper fucntion which is added in patch 2
> ---

Reviewed-by: Claudiu Manoil <claudiu.manoil@xxxxxxx>