netdev - Re: [PATCH 1/2] xfrm: add SA information to the offloaded packet

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Message-ID: <CADsK2K9mgZ=GSQQaNq_nBWCvGP41GQfwu2F0xUw48KWcCEaPEQ@mail.gmail.com>
Date: Wed, 6 Nov 2024 16:14:36 -0800
From: Feng Wang <wangfe@...gle.com>
To: antony.antony@...unet.com
Cc: Leon Romanovsky <leon@...nel.org>, netdev@...r.kernel.org, steffen.klassert@...unet.com
Subject: Re: [PATCH 1/2] xfrm: add SA information to the offloaded packet

Antony brought out an important function xfrm_lookup_with_ifid(), this
function returns the next dst_entry.

The xfrm_lookup_with_ifid() function utilizes xfrm_sk_policy_lookup()
to find a matching policy based on the given if_id. The if_id checking
is handled in it.
Once the policy is found, xfrm_resolve_and_create_bundle() determines
the correct Security Association (SA) and associates it with the
destination entry (dst->xfrm).
This SA information is then passed directly to the driver. Since the
kernel has already performed the necessary if_id checks for policy,
there's no need for the driver to duplicate this effort.