fbnic: Support larger memory-provider RX pages

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Memory providers can set the receive page size for a queue through
QCFG_RX_PAGE_SIZE. fbnic creates PAGE_SIZE PPQ page-pool allocations,
so larger rx_buf_len values are not reflected in the PPQ BDQ geometry.

Use the rendered rx_page_size for PPQ allocations and completion
decoding. The NIC still consumes 4 KiB device pages; a larger PPQ page
is represented by consecutive device-page descriptors, and completion
IDs decode to offsets within the same netmem allocation.

Validate rx_page_size against fbnic's fragment-reference budget,
device-page geometry, and rendered PPQ depth. The page size must be a
power-of-two of at least one device page, its worst-case payload
fragment count must fit the page-pool reference bias, and the PPQ must
retain usable software depth after expansion.

Signed-off-by: Björn Töpel <bjorn@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260925104417.2325213-5-bjorn@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Björn Töpel 2026-09-25 12:44:11 +02:00 • committed by Jakub Kicinski

parent f092b749e1

commit 54491a1dbd

3 changed files with 92 additions and 9 deletions

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4

drivers/net/ethernet/meta/fbnic/fbnic_netdev.c

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96

drivers/net/ethernet/meta/fbnic/fbnic_txrx.c

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1

drivers/net/ethernet/meta/fbnic/fbnic_txrx.h

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