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eth: mpnic: implement Rx queue allocation and cleanup

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The Rx side of a queue triad is a header queue, a payload queue and a
completion queue. With HDS not active yet, frames are split between the
two buffer queues at a fixed header boundary: everything up to 1536
bytes lands in the header page, the rest goes to the payload page. Small
frames therefore never touch the payload queue, and several of them
share one header page.

The device is set to leave headroom and tailroom for XDP and
skb_shared_info respectively.

Both queues draw from one page pool per triad and post buffer
descriptors to the device in batches.

Even though we do not support XDP yet, use the XDP APIs for tracking
pre-skb buffers. The XDP buffer handling helpers save us from
reimplementing the same logic in the driver.

Signed-off-by: Daniel Zahka <daniel.zahka@gmail.com>
Link: https://patch.msgid.link/20260924-linux-mpnic-v2-7-4badc9b58b9e@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Daniel Zahka 2026-09-24 17:35:20 -07:00 • committed by Paolo Abeni
commit 4b26e9cdad
6 changed files with 554 additions and 45 deletions
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