diff options
author | Toke Høiland-Jørgensen <toke@redhat.com> | 2023-01-19 14:15:33 -0800 |
---|---|---|
committer | Martin KaFai Lau <martin.lau@kernel.org> | 2023-01-23 09:58:23 -0800 |
commit | 94ecc5ca4dbf1f01bae6e32f5cd88c0fc5dc3cc9 (patch) | |
tree | ce01afdc15ac3c601fcfe671b9a6ea890364d252 /include/net/xsk_buff_pool.h | |
parent | ab46182d0dcb3a85fb31684246d626192c4a64da (diff) |
xsk: Add cb area to struct xdp_buff_xsk
Add an area after the xdp_buff in struct xdp_buff_xsk that drivers can use
to stash extra information to use in metadata kfuncs. The maximum size of
24 bytes means the full xdp_buff_xsk structure will take up exactly two
cache lines (with the cb field spanning both). Also add a macro drivers can
use to check their own wrapping structs against the available size.
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Anatoly Burakov <anatoly.burakov@intel.com>
Cc: Alexander Lobakin <alexandr.lobakin@intel.com>
Cc: Magnus Karlsson <magnus.karlsson@gmail.com>
Cc: Maryam Tahhan <mtahhan@redhat.com>
Cc: xdp-hints@xdp-project.net
Cc: netdev@vger.kernel.org
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20230119221536.3349901-15-sdf@google.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Diffstat (limited to 'include/net/xsk_buff_pool.h')
-rw-r--r-- | include/net/xsk_buff_pool.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/net/xsk_buff_pool.h b/include/net/xsk_buff_pool.h index f787c3f524b0..3e952e569418 100644 --- a/include/net/xsk_buff_pool.h +++ b/include/net/xsk_buff_pool.h @@ -19,8 +19,11 @@ struct xdp_sock; struct device; struct page; +#define XSK_PRIV_MAX 24 + struct xdp_buff_xsk { struct xdp_buff xdp; + u8 cb[XSK_PRIV_MAX]; dma_addr_t dma; dma_addr_t frame_dma; struct xsk_buff_pool *pool; @@ -28,6 +31,8 @@ struct xdp_buff_xsk { struct list_head free_list_node; }; +#define XSK_CHECK_PRIV_TYPE(t) BUILD_BUG_ON(sizeof(t) > offsetofend(struct xdp_buff_xsk, cb)) + struct xsk_dma_map { dma_addr_t *dma_pages; struct device *dev; |