netdev - Re: [PATCH net-next] libbpf: add function to setup XDP

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Date:   Sat, 9 Dec 2017 09:34:46 -0700
From:   David Ahern <dsahern@...il.com>
To:     Eric Leblond <eric@...it.org>, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, ast@...nel.org, daniel@...earbox.net
Subject: Re: [PATCH net-next] libbpf: add function to setup XDP

On 12/9/17 7:43 AM, Eric Leblond wrote:
> +	/* started nested attribute for XDP */
> +	nla = (struct nlattr *)(((char *)&req)
> +				+ NLMSG_ALIGN(req.nh.nlmsg_len));
> +	nla->nla_type = NLA_F_NESTED | 43/*IFLA_XDP*/;

as a part of the move into libbpf can the magic numbers be replaced by
the names directly and there as a comment?

There are more below.


> +	nla->nla_len = NLA_HDRLEN;
> +
> +	/* add XDP fd */
> +	nla_xdp = (struct nlattr *)((char *)nla + nla->nla_len);
> +	nla_xdp->nla_type = 1/*IFLA_XDP_FD*/;
> +	nla_xdp->nla_len = NLA_HDRLEN + sizeof(int);
> +	memcpy((char *)nla_xdp + NLA_HDRLEN, &fd, sizeof(fd));
> +	nla->nla_len += nla_xdp->nla_len;
> +
> +	/* if user passed in any flags, add those too */
> +	if (flags) {
> +		nla_xdp = (struct nlattr *)((char *)nla + nla->nla_len);
> +		nla_xdp->nla_type = 3/*IFLA_XDP_FLAGS*/;
> +		nla_xdp->nla_len = NLA_HDRLEN + sizeof(flags);
> +		memcpy((char *)nla_xdp + NLA_HDRLEN, &flags, sizeof(flags));
> +		nla->nla_len += nla_xdp->nla_len;
> +	}
> +