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| author | Stanislav Fomichev <sdf@google.com> | 2023-11-27 11:03:14 -0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-11-29 14:59:40 -0800 |
| commit | 11614723af26e7c32fcb704d8f30fdf60c1122dc (patch) | |
| tree | e1040027e771206bc1b17ebc626bf8d5e1a58574 /Documentation/networking | |
| parent | ce59f9686e0eca19431571c7403394a6c36371e2 (diff) | |
| download | linux-11614723af26e7c32fcb704d8f30fdf60c1122dc.tar.gz | |
xsk: Add option to calculate TX checksum in SW
For XDP_COPY mode, add a UMEM option XDP_UMEM_TX_SW_CSUM
to call skb_checksum_help in transmit path. Might be useful
to debugging issues with real hardware. I also use this mode
in the selftests.
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20231127190319.1190813-9-sdf@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/xsk-tx-metadata.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/networking/xsk-tx-metadata.rst b/Documentation/networking/xsk-tx-metadata.rst index 4f376560b23f2b..97ecfa480d00b4 100644 --- a/Documentation/networking/xsk-tx-metadata.rst +++ b/Documentation/networking/xsk-tx-metadata.rst @@ -50,6 +50,15 @@ packet's ``struct xdp_desc`` descriptor should set ``XDP_TX_METADATA`` bit in the ``options`` field. Also note that in a multi-buffer packet only the first chunk should carry the metadata. +Software TX Checksum +==================== + +For development and testing purposes its possible to pass +``XDP_UMEM_TX_SW_CSUM`` flag to ``XDP_UMEM_REG`` UMEM registration call. +In this case, when running in ``XDK_COPY`` mode, the TX checksum +is calculated on the CPU. Do not enable this option in production because +it will negatively affect performance. + Querying Device Capabilities ============================ |