gve: support unreadable netmem

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Declare PP_FLAG_ALLOW_UNREADABLE_NETMEM to turn on unreadable netmem
support in GVE.

We also drop any net_iov packets where header split is not enabled.
We're unable to process packets where the header landed in unreadable
netmem.

Use page_pool_dma_sync_netmem_for_cpu in lieu of
dma_sync_single_range_for_cpu to correctly handle unreadable netmem
that should not be dma-sync'd.

Disable rx_copybreak optimization if payload is unreadable netmem as
that needs access to the payload.

Signed-off-by: Mina Almasry <almasrymina@google.com>
Signed-off-by: Ziwei Xiao <ziweixiao@google.com>
Signed-off-by: Harshitha Ramamurthy <hramamurthy@google.com>
Link: https://patch.msgid.link/20250818210507.3781705-1-hramamurthy@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

...

This commit is contained in:

Mina Almasry 2025-08-18 21:05:07 +00:00 • committed by Jakub Kicinski

parent c3439666d1

commit 62d7f40503

2 changed files with 35 additions and 5 deletions

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5

drivers/net/ethernet/google/gve/gve_buffer_mgmt_dqo.c

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35

drivers/net/ethernet/google/gve/gve_rx_dqo.c

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