Merge branch 'net-devmem-allow-rx-buf-size-page_size-per-binding'

Bobby Eshleman says:

====================
net: devmem: allow rx-buf-size > PAGE_SIZE per binding

Every devmem dmabuf binding hands the page_pool PAGE_SIZE niovs today.
On NICs that consume one descriptor per netmem, this caps a single RX
descriptor at PAGE_SIZE and burns CPU on buffer churn.

In this series, we add a bind-time netlink attribute,
NETDEV_A_DMABUF_RX_BUF_SIZE, that lets userspace request a larger niov
size (power of two >= PAGE_SIZE). Drivers must opt in via
queue_mgmt_ops.QCFG_RX_PAGE_SIZE.

Measurements:

Setup: kperf devmem RX/TX cuda, 4 flows, 64 MB messages, 60s, dctcp,
num-rx-queues=4, dmabuf-rx/tx-size-mb=2048, 10 runs per niov size,
mlx5.

   niov       RX dev Gbps   RX flow avg Gbps         app sys %
  -----  ----------------  -----------------  ----------------
     4K  300.63 +/- 53.21    75.16 +/- 13.30   54.15 +/- 10.23
    16K  321.35 +/- 28.20    80.34 +/-  7.05   41.05 +/-  8.87
    32K  347.63 +/-  2.20    86.91 +/-  0.55   44.54 +/-  3.51
    64K  332.11 +/- 14.26    83.03 +/-  3.56   35.47 +/-  3.11

RX app sys % drops ~19% from 4K to 64K.

kperf support (not yet merged):
https://github.com/facebookexperimental/kperf/commit/8837577f920876bce6986ec18869ac04439ebcd2
====================

Link: https://patch.msgid.link/20260805-tcpdm-large-niovs-v8-0-3e0225e2808c@meta.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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