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xsk: Add getsockopt XDP_OPTIONS

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Make it possible for the application to determine whether the AF_XDP
socket is running in zero-copy mode. To achieve this, add a new
getsockopt option XDP_OPTIONS that returns flags. The only flag
supported for now is the zero-copy mode indicator.

Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Acked-by: Saeed Mahameed <saeedm@mellanox.com>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Maxim Mikityanskiy
2019-06-26 17:35:25 +03:00
committed by Daniel Borkmann
parent d57d76428a
commit 2640d3c812
3 changed files with 36 additions and 0 deletions
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8
tools/include/uapi/linux/if_xdp.h
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@@ -46,6 +46,7 @@ struct xdp_mmap_offsets {
#define XDP_UMEM_FILL_RING 5
#define XDP_UMEM_COMPLETION_RING 6
#define XDP_STATISTICS 7
#define XDP_OPTIONS 8
struct xdp_umem_reg {
__u64 addr; /* Start of packet data area */
@@ -60,6 +61,13 @@ struct xdp_statistics {
__u64 tx_invalid_descs; /* Dropped due to invalid descriptor */
};
struct xdp_options {
__u32 flags;
};
/* Flags for the flags field of struct xdp_options */
#define XDP_OPTIONS_ZEROCOPY (1 << 0)
/* Pgoff for mmaping the rings */
#define XDP_PGOFF_RX_RING 0
#define XDP_PGOFF_TX_RING 0x80000000