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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 <[email protected]>
Signed-off-by: Tariq Toukan <[email protected]>
Acked-by: Saeed Mahameed <[email protected]>
Acked-by: Björn Töpel <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
This commit is contained in:
Maxim Mikityanskiy 2019-06-26 17:35:25 +03:00 • committed by Daniel Borkmann
commit 2640d3c812
3 changed files with 36 additions and 0 deletions
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20
net/xdp/xsk.c
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@ -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;
}