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Miller" , Eric Dumazet , Jakub Kicinski , Jesper Dangaard Brouer , John Fastabend , Paolo Abeni , Richard Cochran , Simon Horman , Stanislav Fomichev Subject: Re: [RFC net-next 00/10] Add TSO map-once DMA helpers and bnxt SW USO support Message-ID: Mail-Followup-To: Joe Damato , netdev@vger.kernel.org, michael.chan@broadcom.com, pavan.chebbi@broadcom.com, linux-kernel@vger.kernel.org, Alexei Starovoitov , Andrew Lunn , bpf@vger.kernel.org, Daniel Borkmann , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Jesper Dangaard Brouer , John Fastabend , Paolo Abeni , Richard Cochran , Simon Horman , Stanislav Fomichev References: <20260310212209.2263939-1-joe@dama.to> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260310212209.2263939-1-joe@dama.to> On Tue, Mar 10, 2026 at 02:21:48PM -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. N per-packet DMA maps are replaced with a single map for the > entire GSO skb. > > The added helpers are then used in bnxt to add support for software UDP > Segmentation Offloading (SW USO) for older bnxt devices which do not have > support for USO in hardware. Since the helpers are generic, other drivers > can be extended similarly. Sorry for the noise; just realized this implementation is buggy. Will fix and send an RFC v2, but this series is the general idea of what I'll be posting, for anyone interested.