netdev - Re: [PATCH net 05/10] net: xdp: don't allow device-bound programs in driver mode

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Date:   Mon, 20 Nov 2017 23:21:56 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        David Ahern <dsahern@...il.com>
Cc:     netdev@...r.kernel.org, alexei.starovoitov@...il.com
Subject: Re: [PATCH net 05/10] net: xdp: don't allow device-bound programs in
 driver mode

Hi Jakub,

On 11/20/2017 11:02 PM, Jakub Kicinski wrote:
> On Mon, 20 Nov 2017 07:36:39 -0700, David Ahern wrote:
>> On 11/19/17 9:55 PM, Jakub Kicinski wrote:
>>> diff --git a/net/core/dev.c b/net/core/dev.c
>>> index 09525a27319c..21de2d37a0ba 100644
>>> --- a/net/core/dev.c
>>> +++ b/net/core/dev.c
>>> @@ -7143,6 +7143,13 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
>>>  					     bpf_op == ops->ndo_bpf);
>>>  		if (IS_ERR(prog))
>>>  			return PTR_ERR(prog);
>>> +
>>> +		if (!(flags & XDP_FLAGS_HW_MODE) &&
>>> +		    bpf_prog_is_dev_bound(prog->aux)) {
>>> +			NL_SET_ERR_MSG_MOD(extack, "using device-bound program without HW_MODE flag not supported");  
>>
>> I don't see dev_change_xdp_fd called by device drivers, so that should
>> just be NL_SET_ERR_MSG. Also, "is not supported" sounds better to me
>> than just "not supported".
> 
> Thanks, I'll give others a couple more hours and respin!

The rest of the series looks good to me, please respin with the minor
changes requested.

Thanks,
Daniel