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| author |  Stanislav Fomichev <sdf@google.com>
| 2023-11-27 11:03:07 -0800 |
|---|---|---|
| committer |  Alexei Starovoitov <ast@kernel.org>
| 2023-11-29 14:59:40 -0800 |
| commit | 341ac980eab90ac1f6c22ee9f9da83ed9604d899 (patch) | |
| tree | 5b12e210a709a24f3b5b68ec466c5b6e044a81c6 /tools/include/uapi/linux/netdev.h | |
| parent | Merge branch 'selftests-bpf-use-pkg-config-to-determine-ld-flags' (diff) | |
| download | linux-341ac980eab90ac1f6c22ee9f9da83ed9604d899.tar.gz linux-341ac980eab90ac1f6c22ee9f9da83ed9604d899.tar.bz2 linux-341ac980eab90ac1f6c22ee9f9da83ed9604d899.zip | |
xsk: Support tx_metadata_len
For zerocopy mode, tx_desc->addr can point to an arbitrary offset
and carry some TX metadata in the headroom. For copy mode, there
is no way currently to populate skb metadata.
Introduce new tx_metadata_len umem config option that indicates how many
bytes to treat as metadata. Metadata bytes come prior to tx_desc address
(same as in RX case).
The size of the metadata has mostly the same constraints as XDP:
- less than 256 bytes
- 8-byte aligned (compared to 4-byte alignment on xdp, due to 8-byte
timestamp in the completion)
- non-zero
This data is not interpreted in any way right now.
Reviewed-by: Song Yoong Siang <yoong.siang.song@intel.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20231127190319.1190813-2-sdf@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/include/uapi/linux/netdev.h')
0 files changed, 0 insertions, 0 deletions