RE: [net-next, v4, 08/11] net: sock: extend SO_TIMESTAMPING for PHC binding

["Y.b. Lu" <yangbo.lu@xxxxxxx>]

Hi Mat,

> -----Original Message-----
> From: Mat Martineau <mathew.j.martineau@xxxxxxxxxxxxxxx>
> Sent: 2021年6月26日 9:00
> To: Y.b. Lu <yangbo.lu@xxxxxxx>
> Cc: netdev@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> linux-kselftest@xxxxxxxxxxxxxxx; mptcp@xxxxxxxxxxxxxxx; Richard Cochran
> <richardcochran@xxxxxxxxx>; David S . Miller <davem@xxxxxxxxxxxxx>;
> Jakub Kicinski <kuba@xxxxxxxxxx>; Matthieu Baerts
> <matthieu.baerts@xxxxxxxxxxxx>; Shuah Khan <shuah@xxxxxxxxxx>; Michal
> Kubecek <mkubecek@xxxxxxx>; Florian Fainelli <f.fainelli@xxxxxxxxx>;
> Andrew Lunn <andrew@xxxxxxx>; Rui Sousa <rui.sousa@xxxxxxx>; Sebastien
> Laveze <sebastien.laveze@xxxxxxx>
> Subject: Re: [net-next, v4, 08/11] net: sock: extend SO_TIMESTAMPING for
> PHC binding
> 
> On Fri, 25 Jun 2021, Yangbo Lu wrote:
> 
[...]
> > diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c
> > index ea38cbcd2ad4..e20aefc20d75 100644
> > --- a/net/mptcp/sockopt.c
> > +++ b/net/mptcp/sockopt.c
> > @@ -207,14 +207,26 @@ static int
> mptcp_setsockopt_sol_socket_timestamping(struct mptcp_sock *msk,
> > {
> > 	struct mptcp_subflow_context *subflow;
> > 	struct sock *sk = (struct sock *)msk;
> > +	struct so_timestamping timestamping;
> > 	int val, ret;
> >
> > -	ret = mptcp_get_int_option(msk, optval, optlen, &val);
> > -	if (ret)
> > -		return ret;
> > +	if (optlen == sizeof(timestamping)) {
> > +		if (copy_from_sockptr(&timestamping, optval,
> > +				      sizeof(timestamping)))
> > +			return -EFAULT;
> > +	} else if (optlen == sizeof(int)) {
> > +		if (copy_from_sockptr(val, optval, sizeof(*val)))
>                                        ^^^
> 
> As the kbuild bot noted, this needs to be a pointer. You could pass in
> &timestamping.flags and you wouldn't need the 'val' variable at all.
> 
> 

Ok, I sent v5 to fix.
Sorry for the trouble. It seemed my test config missed to enable MPTCP.

Thanks.

> -Mat
> 
> 
> > +			return -EFAULT;
> > +
> > +		memset(&timestamping, 0, sizeof(timestamping));
> > +		timestamping.flags = val;
> > +	} else {
> > +		return -EINVAL;
> > +	}
> >
> > 	ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
> > -			      KERNEL_SOCKPTR(&val), sizeof(val));
> > +			      KERNEL_SOCKPTR(&timestamping),
> > +			      sizeof(timestamping));
> > 	if (ret)
> > 		return ret;
> >
> > @@ -224,7 +236,7 @@ static int
> mptcp_setsockopt_sol_socket_timestamping(struct mptcp_sock *msk,
> > 		struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
> > 		bool slow = lock_sock_fast(ssk);
> >
> > -		sock_set_timestamping(sk, optname, val);
> > +		sock_set_timestamping(sk, optname, timestamping);
> > 		unlock_sock_fast(ssk, slow);
> > 	}
> >
> > --
> > 2.25.1
> >
> >
> 
> --
> Mat Martineau
> Intel