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xsk: Add getsockopt XDP_OPTIONS 

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
include/uapi/linux/if_xdp.h
View File

@ -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

20
net/xdp/xsk.c
View File

@ -650,6 +650,26 @@ static int xsk_getsockopt(struct socket *sock, int level, int optname,
return 0;
}
case XDP_OPTIONS:
{
struct xdp_options opts = {};
if (len < sizeof(opts))
return -EINVAL;
mutex_lock(&xs->mutex);
if (xs->zc)
opts.flags |= XDP_OPTIONS_ZEROCOPY;
mutex_unlock(&xs->mutex);
len = sizeof(opts);
if (copy_to_user(optval, &opts, len))
return -EFAULT;
if (put_user(len, optlen))
return -EFAULT;
return 0;
}
default:
break;
}

8
tools/include/uapi/linux/if_xdp.h
View File

@ -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