net: bnxt: Use dma_unmap_len for TX completion unmapping

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Store the DMA mapping length in each TX buffer descriptor via
dma_unmap_len_set at submit time, and use dma_unmap_len at completion
time.

This is a no-op for normal packets but prepares for software USO,
where header BDs set dma_unmap_len to 0 because the header buffer
is unmapped collectively rather than per-segment.

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Joe Damato <joe@dama.to>
Link: https://patch.msgid.link/20260408230607.2019402-5-joe@dama.to
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Joe Damato 2026-04-08 16:05:53 -07:00 • committed by Jakub Kicinski

parent 637237d3d9

commit 3cb430e62c

1 changed files with 41 additions and 22 deletions

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drivers/net/ethernet/broadcom/bnxt/bnxt.c

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