psp: allow drivers to omit tx key add/del ops

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Drivers that don't use an SADB for tx key storage don't have a use
for psp_dev_ops::tx_key_add and psp_dev_ops::tx_key_del.

Allowing drivers to leave these as NULL gives PSP core a simple way to
determine whether a driver utilizes an SADB, which in turn could
affect how PSP core chooses to handle certain situations.

For example:
- deciding if tx key deletion needs to be delayed during a rekeying
  event to avoid in-flight packets using old key handles.
- choosing whether or not to report device stats like SADB usage to
  userspace, which only make sense if the driver uses on-device key
  storage.

Signed-off-by: Daniel Zahka <daniel.zahka@gmail.com>
Link: https://patch.msgid.link/20260903-psp-prep-v1-3-d47e9c4c375d@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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This commit is contained in:

Daniel Zahka 2026-09-03 18:34:01 -07:00 • committed by Jakub Kicinski

parent 4d3a7d1104

commit 1e16b30310

4 changed files with 19 additions and 7 deletions

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4

include/net/psp/types.h

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8

net/psp/psp.h

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6

net/psp/psp_main.c

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8

net/psp/psp_sock.c

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