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xsk: Add option to calculate TX checksum in SW

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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>
This commit is contained in:
Stanislav Fomichev
2023-11-27 11:03:14 -08:00
committed by Andrii Nakryiko
parent 95134be22e
commit 419eab9ec7
1 changed files with 7 additions and 1 deletions
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8
include/uapi/linux/if_xdp.h
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@@ -33,7 +33,13 @@
#define XDP_USE_SG (1 << 4)
/* Flags for xsk_umem_config flags */
#define XDP_UMEM_UNALIGNED_CHUNK_FLAG (1 << 0)
#define XDP_UMEM_UNALIGNED_CHUNK_FLAG (1 << 0)
/* Force checksum calculation in software. Can be used for testing or
* working around potential HW issues. This option causes performance
* degradation and only works in XDP_COPY mode.
*/
#define XDP_UMEM_TX_SW_CSUM (1 << 1)
struct sockaddr_xdp {
__u16 sxdp_family;