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| author | Stanislav Fomichev <sdf@google.com> | 2023-11-27 20:03:07 +0100 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-11-29 23:59:40 +0100 |
| commit | 341ac980eab90ac1f6c22ee9f9da83ed9604d899 (patch) | |
| tree | 5b12e210a709a24f3b5b68ec466c5b6e044a81c6 /net/xdp/xsk_buff_pool.c | |
| parent | Merge branch 'selftests-bpf-use-pkg-config-to-determine-ld-flags' (diff) | |
| download | linux-341ac980eab90ac1f6c22ee9f9da83ed9604d899.tar.xz 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 'net/xdp/xsk_buff_pool.c')
| -rw-r--r-- | net/xdp/xsk_buff_pool.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c index 49cb9f9a09be..386eddcdf837 100644 --- a/net/xdp/xsk_buff_pool.c +++ b/net/xdp/xsk_buff_pool.c @@ -85,6 +85,7 @@ struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs, XDP_PACKET_HEADROOM; pool->umem = umem; pool->addrs = umem->addrs; + pool->tx_metadata_len = umem->tx_metadata_len; INIT_LIST_HEAD(&pool->free_list); INIT_LIST_HEAD(&pool->xskb_list); INIT_LIST_HEAD(&pool->xsk_tx_list); |