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Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , Andrew Lunn , Gerd Hoffmann , Vivek Kasireddy , Sumit Semwal , Christian =?utf-8?B?S8O2bmln?= , Shuah Khan , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-kselftest@vger.kernel.org, sdf@fomichev.me, razor@blackwall.org, daniel@iogearbox.net, almasrymina@google.com, matttbe@kernel.org, skhawaja@google.com, dw@davidwei.uk, Bobby Eshleman Subject: Re: [PATCH net-next v3 3/4] selftests/net: ncdevmem: add -b option to set rx-buf-size on bind Message-ID: References: <20260612-tcpdm-large-niovs-v3-0-a3b693e76fcb@meta.com> <20260612-tcpdm-large-niovs-v3-3-a3b693e76fcb@meta.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260612-tcpdm-large-niovs-v3-3-a3b693e76fcb@meta.com> On 06/12, Bobby Eshleman wrote: > From: Bobby Eshleman > > Add -b to request a non-default niov size via > NETDEV_A_DMABUF_RX_BUF_SIZE. When the value exceeds PAGE_SIZE, > udmabuf_alloc() switches to an MFD_HUGETLB-backed memfd so each 2 MB > hugepage produces one naturally-aligned sg entry. > > Reject values > 2 MB up front: MFD_HUGETLB + udmabuf can only guarantee > 2 MB per sg entry (one hugepage), so a larger rx_buf_size would fail the > per-sg length/alignment check. > > Add CONFIG_HUGETLBFS=y to drivers/net/hw/config so the new path is > reachable in the CI kernels built for these tests. > > Signed-off-by: Bobby Eshleman Acked-by: Stanislav Fomichev