From: Ayush Sawal <ayush.sawal@xxxxxxxxxxx>
Date: Wed, 6 May 2020 20:17:19 +0530
> This reverts commit 27c6feb0fb33a665a746346e76714826a5be5d10.
>
> For ipsec offload the chelsio's ethernet driver expects a single mtu
> sized packet.
>
> But when ipsec traffic is running using iperf, most of the packets in
> that traffic are gso packets(large sized skbs) because GSO is enabled by
> default in TCP, due to this commit 0a6b2a1dc2a2 ("tcp: switch to GSO
> being always on"), so chcr_ipsec_offload_ok() receives a gso
> skb(with gso_size non zero).
>
> Due to the check in chcr_ipsec_offload_ok(), this function returns false
> for most of the packet, then ipsec offload is skipped and the skb goes
> out taking the coprocessor path which reduces the bandwidth for inline
> ipsec.
>
> If this check is removed then for most of the packets(large sized skbs)
> the chcr_ipsec_offload_ok() returns true and then as GSO is on, the
> segmentation of the packet happens in the kernel and then finally the
> driver_xmit is called, which receives a segmented mtu sized packet which
> is what the driver expects for ipsec offload. So this case becomes
> unnecessary here, therefore removing it.
>
> Signed-off-by: Ayush Sawal <ayush.sawal@xxxxxxxxxxx>
Applied.
