From: Leon Romanovsky <leon@kernel.org>
To: Joe Damato <joe@dama.to>
Cc: netdev@vger.kernel.org, michael.chan@broadcom.com,
pavan.chebbi@broadcom.com, linux-kernel@vger.kernel.org,
Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: [RFC net-next v2 00/12] Add TSO map-once DMA helpers and bnxt SW USO support
Date: Mon, 16 Mar 2026 21:44:19 +0200 [thread overview]
Message-ID: <20260316194419.GH61385@unreal> (raw)
In-Reply-To: <20260312223457.1999489-1-joe@dama.to>
On Thu, Mar 12, 2026 at 03:34:37PM -0700, Joe Damato wrote:
> Greetings:
>
> This series extends net/tso to add a data structure and some helpers allowing
> drivers to DMA map headers and packet payloads a single time. The helpers can
> then be used to reference slices of shared mapping for each segment. This
> helps to avoid the cost of repeated DMA mappings, especially on systems which
> use an IOMMU.
In modern kernels, it is done by using DMA IOVA API, see NVMe
driver/block layer for the most comprehensive example.
The pseudo code is:
if (with_iommu)
use dma_iova_link/dma_iova_unlink
else
use dma_map_phys()
https://lore.kernel.org/all/cover.1746424934.git.leon@kernel.org/
https://lore.kernel.org/all/20250623141259.76767-1-hch@lst.de/
https://lwn.net/Articles/997563/
Thanks
next prev parent reply other threads:[~2026-03-16 19:44 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-12 22:34 [RFC net-next v2 00/12] Add TSO map-once DMA helpers and bnxt SW USO support Joe Damato
2026-03-12 22:34 ` [RFC net-next v2 01/12] net: tso: Introduce tso_dma_map Joe Damato
2026-03-12 22:34 ` [RFC net-next v2 02/12] net: tso: Add tso_dma_map helpers Joe Damato
2026-03-12 22:34 ` [RFC net-next v2 03/12] net: bnxt: Export bnxt_xmit_get_cfa_action Joe Damato
2026-03-12 22:34 ` [RFC net-next v2 04/12] net: bnxt: Add a helper for tx_bd_ext Joe Damato
2026-03-12 22:34 ` [RFC net-next v2 05/12] net: bnxt: Use dma_unmap_len for TX completion unmapping Joe Damato
2026-03-12 22:34 ` [RFC net-next v2 06/12] net: bnxt: Add TX inline buffer infrastructure Joe Damato
2026-03-12 22:34 ` [RFC net-next v2 07/12] net: bnxt: Add boilerplate GSO code Joe Damato
2026-03-12 22:34 ` [RFC net-next v2 08/12] net: bnxt: Implement software USO Joe Damato
2026-03-12 22:34 ` [RFC net-next v2 09/12] net: bnxt: Add SW GSO completion and teardown support Joe Damato
2026-03-12 22:34 ` [RFC net-next v2 10/12] net: bnxt: Dispatch to SW USO Joe Damato
2026-03-12 22:34 ` [RFC net-next v2 11/12] net: netdevsim: Add support for " Joe Damato
2026-03-12 22:34 ` [RFC net-next v2 12/12] selftests: drv-net: Add USO test Joe Damato
2026-03-16 19:44 ` Leon Romanovsky [this message]
2026-03-16 21:02 ` [RFC net-next v2 00/12] Add TSO map-once DMA helpers and bnxt SW USO support Joe Damato
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