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selftests/xsk: add basic multi-buffer test

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Add the first basic multi-buffer test that sends a stream of 9K
packets and validates that they are received at the other end. In
order to enable sending and receiving multi-buffer packets, code that
sets the MTU is introduced as well as modifications to the XDP
programs so that they signal that they are multi-buffer enabled.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/r/20230719132421.584801-20-maciej.fijalkowski@intel.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Magnus Karlsson
2023-07-19 15:24:16 +02:00
committed by Andrii Nakryiko
parent 658b107d4d
commit 071630384b
1 changed files with 6 additions and 0 deletions
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6
include/uapi/linux/if_xdp.h
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@@ -25,6 +25,12 @@
* application.
*/
#define XDP_USE_NEED_WAKEUP (1 << 3)
/* By setting this option, userspace application indicates that it can
* handle multiple descriptors per packet thus enabling xsk core to split
* multi-buffer XDP frames into multiple Rx descriptors. Without this set
* such frames will be dropped by xsk.
*/
#define XDP_USE_SG (1 << 4)
/* Flags for xsk_umem_config flags */
#define XDP_UMEM_UNALIGNED_CHUNK_FLAG (1 << 0)