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From: Jakub Kicinski <jakub.kicinski@netronome.com>
To: "Björn Töpel" <bjorn.topel@gmail.com>
Cc: "Maxim Mikityanskiy" <maximmi@mellanox.com>,
	"Alexei Starovoitov" <ast@kernel.org>,
	"Daniel Borkmann" <daniel@iogearbox.net>,
	"Björn Töpel" <bjorn.topel@intel.com>,
	"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	"Saeed Mahameed" <saeedm@mellanox.com>,
	"Jesper Dangaard Brouer" <hawk@kernel.org>,
	"John Fastabend" <john.fastabend@gmail.com>,
	"Martin KaFai Lau" <kafai@fb.com>,
	"Song Liu" <songliubraving@fb.com>, "Yonghong Song" <yhs@fb.com>
Subject: Re: [PATCH bpf-next] net: Don't uninstall an XDP program when none is installed
Date: Thu, 13 Jun 2019 10:26:34 -0700
Message-ID: <20190613102634.18fdb910@cakuba.netronome.com> (raw)
In-Reply-To: <CAJ+HfNg8C+teCywDDjKY6_gdPsg_dzm1cMNFhj7gLps6RYMAJQ@mail.gmail.com>

On Thu, 13 Jun 2019 11:04:45 +0200, Björn Töpel wrote:
> > > +     } else {
> > > +             if (!__dev_xdp_query(dev, bpf_op, query))
> > > +                     return 0;  
> >
> > This will mask the error if program is installed with different flags.
> >  
> 
> Hmm, probably missing something, but I fail to see how the error is
> being masked? This is to catch the NULL-to-NULL case early.

You're right, it shouldn't matter.

  reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-12 16:14 Maxim Mikityanskiy
2019-06-12 18:39 ` Björn Töpel
2019-06-12 21:15 ` Jakub Kicinski
2019-06-13  9:04   ` Björn Töpel
2019-06-13 17:26     ` Jakub Kicinski [this message]
2019-07-10 11:16 ` Maxim Mikityanskiy
2019-07-12 15:44   ` Daniel Borkmann
2019-08-14 14:34     ` [PATCH bpf-next v2] net: Don't call XDP_SETUP_PROG when nothing is changed Maxim Mikityanskiy
2019-08-14 17:57       ` Jonathan Lemon
2019-08-14 22:01       ` Jakub Kicinski
2019-08-17 21:29       ` Daniel Borkmann

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