Backport XSK queue teardown fixes from torvalds/linux mainline (tx_timeout + NULL deref during AF_XDP reload)

[Shivam279Chaudhary]

We're hitting a reproducible NIC crash (host becomes permanently unreachable) on ice 2.2.8 during AF_XDP/XSK socket setup/teardown under TX load. The crash sequence is:

1. False TX watchdog timeout (transmit queue N timed out) during ice_qp_dis
2. PF reset triggers NULL pointer dereference in ice_qp_dis+0x6c (ring pointer freed during reset)
3. Workqueue deadlock between ice_service_task and xp_release_deferred — NIC never recovers

The upstream Linux kernel already has 4 commits (merged Jul-Aug 2024) that fix this. They all modify ice_xsk.c (ice_qp_dis / ice_qp_ena):

• 99099c6bc75a (torvalds/linux@99099c6bc75a) — Reorder IRQ/NAPI disable before touching queues
• 405d9999aa0b (torvalds/linux@405d9999aa0b) — Add synchronize_net() before queue stop
• 9da75a511c55 (torvalds/linux@9da75a511c55) — Toggle netif_carrier_off/on during XSK reconfig
• 7e3b407ccbea (torvalds/linux@7e3b407ccbea) — Remove ICE_CFG_BUSY (never protected the queue pair)

All fix the original 2d4238f55697 ( torvalds/linux@2d4238f55697) ("ice: Add support for AF_XDP").

Questions:

1. Are these fixes planned for any upcoming out-of-tree release (2.5.x or later)?
2. If so, what's the expected timeline?

We've validated that backporting these 4 commits onto ice 2.5.4 resolves the issue in our environment.

Environment: Intel E810, ice 2.2.8 (DKMS), kernel 5.10.253 (Amazon Linux 2), AF_XDP with 62 queues.

[hemantku]

@pkitszel @lczapnik - Could you take a look at the above request?