netdev - Re: [PATCH] SUNRPC: use request size to initialize bio_vec in svc_udp

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Date: Thu, 18 Jan 2024 09:42:42 +0100
From: Lucas Stach <l.stach@...gutronix.de>
To: Chuck Lever <chuck.lever@...cle.com>
Cc: Jeff Layton <jlayton@...nel.org>, Neil Brown <neilb@...e.de>, Olga
 Kornievskaia <kolga@...app.com>, Dai Ngo <Dai.Ngo@...cle.com>, Tom Talpey
 <tom@...pey.com>, Trond Myklebust <trond.myklebust@...merspace.com>, Anna
 Schumaker <anna@...nel.org>,  linux-nfs@...r.kernel.org,
 netdev@...r.kernel.org, kernel@...gutronix.de,  patchwork-lst@...gutronix.de
Subject: Re: [PATCH] SUNRPC: use request size to initialize bio_vec in
 svc_udp_sendto()

Am Mittwoch, dem 17.01.2024 um 17:03 -0500 schrieb Chuck Lever:
> On Wed, Jan 17, 2024 at 10:06:28PM +0100, Lucas Stach wrote:
> > Use the proper size when setting up the bio_vec, as otherwise only
> > zero-length UDP packets will be sent.
> > 
> > Fixes: baabf59c2414 ("SUNRPC: Convert svc_udp_sendto() to use the per-socket bio_vec array")
> > Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
> > ---
> >  net/sunrpc/svcsock.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
> > index 998687421fa6..e0ce4276274b 100644
> > --- a/net/sunrpc/svcsock.c
> > +++ b/net/sunrpc/svcsock.c
> > @@ -717,12 +717,12 @@ static int svc_udp_sendto(struct svc_rqst *rqstp)
> >  				ARRAY_SIZE(rqstp->rq_bvec), xdr);
> >  
> >  	iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, rqstp->rq_bvec,
> > -		      count, 0);
> > +		      count, rqstp->rq_res.len);
> >  	err = sock_sendmsg(svsk->sk_sock, &msg);
> >  	if (err == -ECONNREFUSED) {
> >  		/* ICMP error on earlier request. */
> >  		iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, rqstp->rq_bvec,
> > -			      count, 0);
> > +			      count, rqstp->rq_res.len);
> >  		err = sock_sendmsg(svsk->sk_sock, &msg);
> >  	}
> >  
> > -- 
> > 2.43.0
> > 
> 
> I can't fathom why I would have chosen zero for the @count argument.
> 
> We currently have zero test coverage for UDP. I'll look into that.
> 
> I've applied this to the nfsd-fixes branch. It should appear in
> v6.8-rc if I can get it tested.

Thanks. For what it is worth, this fix didn't come out of pure code
inspection, but fixes a real world setup for me. While I can't claim
that I have any kind of comprehensive testing, this fix has at least
shown to fix the issue introduced in the referenced commit in my setup.

Regards,
Lucas