Merge branch 'net-use-skb_attempt_defer_free-in-napi_consume_skb'

Eric Dumazet says:

====================
net: use skb_attempt_defer_free() in napi_consume_skb()

There is a lack of NUMA awareness and more generally lack
of slab caches affinity on TX completion path.

Modern drivers are using napi_consume_skb(), hoping to cache sk_buff
in per-cpu caches so that they can be recycled in RX path.

Only use this if the skb was allocated on the same cpu,
otherwise use skb_attempt_defer_free() so that the skb
is freed on the original cpu.

This removes contention on SLUB spinlocks and data structures,
and this makes sure that recycled sk_buff have correct NUMA locality.

After this series, I get ~50% improvement for an UDP tx workload
on an AMD EPYC 9B45 (IDPF 200Gbit NIC with 32 TX queues).

I will later refactor skb_attempt_defer_free()
to no longer have to care of skb_shared() and skb_release_head_state().
====================

Link: https://patch.msgid.link/20251106202935.1776179-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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