From: Stanislav Fomichev <sdf.kernel@gmail.com>
To: Bobby Eshleman <bobbyeshleman@gmail.com>
Cc: "Donald Hunter" <donald.hunter@gmail.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
"Eric Dumazet" <edumazet@google.com>,
"Paolo Abeni" <pabeni@redhat.com>,
"Simon Horman" <horms@kernel.org>,
"Andrew Lunn" <andrew+netdev@lunn.ch>,
"Gerd Hoffmann" <kraxel@redhat.com>,
"Vivek Kasireddy" <vivek.kasireddy@intel.com>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"Christian König" <christian.koenig@amd.com>,
"Shuah Khan" <shuah@kernel.org>,
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" <bobbyeshleman@meta.com>
Subject: Re: [PATCH net-next v3 3/4] selftests/net: ncdevmem: add -b option to set rx-buf-size on bind
Date: Fri, 12 Jun 2026 19:03:34 -0700 [thread overview]
Message-ID: <aiy6bh2IAHDtBX2L@devvm7509.cco0.facebook.com> (raw)
In-Reply-To: <20260612-tcpdm-large-niovs-v3-3-a3b693e76fcb@meta.com>
On 06/12, Bobby Eshleman wrote:
> From: Bobby Eshleman <bobbyeshleman@meta.com>
>
> Add -b <bytes> 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 <bobbyeshleman@meta.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
next prev parent reply other threads:[~2026-06-13 2:04 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-12 16:25 [PATCH net-next v3 0/4] net: devmem: allow rx-buf-size > PAGE_SIZE per binding Bobby Eshleman
2026-06-12 16:25 ` [PATCH net-next v3 1/4] net: devmem: allow rx-buf-size > PAGE_SIZE per dmabuf binding Bobby Eshleman
2026-06-12 16:25 ` [PATCH net-next v3 2/4] udmabuf: emit one sg entry per pinned folio Bobby Eshleman
2026-06-12 16:25 ` [PATCH net-next v3 3/4] selftests/net: ncdevmem: add -b option to set rx-buf-size on bind Bobby Eshleman
2026-06-13 2:03 ` Stanislav Fomichev [this message]
2026-06-12 16:26 ` [PATCH net-next v3 4/4] selftests/net: devmem.py: add check_rx_large_niov Bobby Eshleman
2026-06-13 2:03 ` Stanislav Fomichev
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