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net: ti: icssg-prueth: Add AF_XDP zero copy for RX

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Use xsk_pool inside rx_chn to check if a given Rx queue id
is registered for xsk zero copy, which gets populated during
xsk enable.

Update prueth_create_xdp_rxqs to register and support two different
memory models (xsk and page) for a given Rx queue, if registered for
zero copy.

If xsk_pool is registered, allocate buffers from UMEM and map them
to the hardware Rx descriptors. In NAPI context, run the XDP program
for each packet and process the xsk buffer according to the XDP
result codes. Also allocate new set of buffers from UMEM for the
next batch of NAPI Rx processing. Add XDK_WAKEUP_RX support to support
xsk wakeup for Rx.

Move prueth_create_page_pool to prueth_init_rx_chns to avoid freeing
and re-allocating the system memory every time there is a transition
from zero copy to copy and prevents any type of memory fragmentation
or leak.

Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Meghana Malladi <m-malladi@ti.com>
Link: https://patch.msgid.link/20251118135542.380574-6-m-malladi@ti.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Meghana Malladi 2025-11-18 19:25:41 +05:30 • committed by Paolo Abeni
commit 7a64bb388d
3 changed files with 313 additions and 72 deletions
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