netdev - Re: [PATCH v10 00/12] Add driver bpf hook for early packet drop and forwarding

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Date:	Wed, 20 Jul 2016 07:08:59 -0700
From:	Brenden Blanco <bblanco@...mgrid.com>
To:	Tariq Toukan <ttoukan.linux@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	jhs@...atatu.com, saeedm@....mellanox.co.il, kafai@...com,
	brouer@...hat.com, as754m@....com, alexei.starovoitov@...il.com,
	gerlitz.or@...il.com, john.fastabend@...il.com,
	hannes@...essinduktion.org, tgraf@...g.ch, tom@...bertland.com,
	daniel@...earbox.net
Subject: Re: [PATCH v10 00/12] Add driver bpf hook for early packet drop and
 forwarding

On Wed, Jul 20, 2016 at 12:18:49PM +0300, Tariq Toukan wrote:
> 
> On 20/07/2016 8:09 AM, David Miller wrote:
> >From: Brenden Blanco <bblanco@...mgrid.com>
> >Date: Tue, 19 Jul 2016 12:16:45 -0700
> >
> >>This patch set introduces new infrastructure for programmatically
> >>processing packets in the earliest stages of rx, as part of an effort
> >>others are calling eXpress Data Path (XDP) [1]. Start this effort by
> >>introducing a new bpf program type for early packet filtering, before
> >>even an skb has been allocated.
> >>
> >>Extend on this with the ability to modify packet data and send back out
> >>on the same port.
> >Series applied, thanks.
> 
> Hi Dave,
> 
> The series causes compilation errors in our driver (and warnings).
> Please revert it.
My bad. The kbuild robot caught it as well. As an alternative to revert,
I can also send a patch to add the necessary inline stub.
> 
> *23:08:37*drivers/net/ethernet/mellanox/mlx4/en_netdev.c: In
> function 'mlx4_xdp_set':
> 
> *23:08:37*drivers/net/ethernet/mellanox/mlx4/en_netdev.c:2566:4:
> error: implicit declaration of function 'bpf_prog_add'
> [-Werror=implicit-function-declaration]
> 
> *23:08:37*    prog = bpf_prog_add(prog, priv->rx_ring_num - 1);
> 
> *23:08:37*    ^
> 
> *23:08:37*  CC [M]  drivers/gpu/drm/nouveau/nvkm/subdev/i2c/padgm200.o
> 
> *23:08:37*drivers/net/ethernet/mellanox/mlx4/en_netdev.c:2566:9:
> warning: assignment makes pointer from integer without a cast
> [enabled by default]
> 
> *23:08:37*    prog = bpf_prog_add(prog, priv->rx_ring_num - 1);
> 
> *23:08:37*         ^
> 
> *23:08:37*drivers/net/ethernet/mellanox/mlx4/en_netdev.c:2592:8:
> warning: assignment makes pointer from integer without a cast
> [enabled by default]
> 
> *23:08:37*   prog = bpf_prog_add(prog, priv->rx_ring_num - 1);
> 
> *23:08:37*        ^
> 
> *23:08:37*cc1: some warnings being treated as errors
> 
> *23:08:37*make[7]: ***
> [drivers/net/ethernet/mellanox/mlx4/en_netdev.o] Error 1
> 
> *23:08:37*make[7]: *** Waiting for unfinished jobs....
> 
> *23:08:37*  CC      drivers/tty/serial/8250/8250_pnp.o
> 
>