Date: Tue, 21 Aug 2018 14:33:36 -0700 From: Gleb Smirnoff <glebius@freebsd.org> To: Navdeep Parhar <np@freebsd.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r337932 - in head/sys: net netinet Message-ID: <20180821213336.GO27633@FreeBSD.org> In-Reply-To: <1e809525-77bd-19e2-6908-a984c3414aed@FreeBSD.org> References: <201808162346.w7GNkc2p006822@repo.freebsd.org> <20180821212628.GN27633@FreeBSD.org> <1e809525-77bd-19e2-6908-a984c3414aed@FreeBSD.org>
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On Tue, Aug 21, 2018 at 02:28:27PM -0700, Navdeep Parhar wrote: N> On 8/21/18 2:26 PM, Gleb Smirnoff wrote: N> > Navdeep, N> > N> > On Thu, Aug 16, 2018 at 11:46:38PM +0000, Navdeep Parhar wrote: N> > N> Author: np N> > N> Date: Thu Aug 16 23:46:38 2018 N> > N> New Revision: 337932 N> > N> URL: https://svnweb.freebsd.org/changeset/base/337932 N> > N> N> > N> Log: N> > N> Add the ability to look up the 3b PCP of a VLAN interface. Use it in N> > N> toe_l2_resolve to fill up the complete vtag and not just the vid. N> > N> N> > N> Reviewed by: kib@ N> > N> MFC after: 1 week N> > N> Sponsored by: Chelsio Communications N> > N> Differential Revision: https://reviews.freebsd.org/D16752 N> > ... N> > N> +static int N> > N> +vlan_pcp(struct ifnet *ifp, uint16_t *pcpp) N> > N> +{ N> > N> + struct ifvlan *ifv; N> > N> + N> > N> + if (ifp->if_type != IFT_L2VLAN) N> > N> + return (EINVAL); N> > N> + ifv = ifp->if_softc; N> > N> + *pcpp = ifv->ifv_pcp; N> > N> + return (0); N> > N> +} N> > N> > Is there any good reason not to assert that ifp->if_type == IFT_L2VLAN? N> > N> N> I can't think of any. But I wrote it this way to match the vlan_tag() N> function a few lines above. Hmm, this comes from OFED import. But at the same time it brings macros like this: + (_ifp)->if_type == IFT_L2VLAN ? (*vlan_trunkdev_p)((_ifp)) : NULL +#define VLAN_TAG(_ifp, _tag) \ + (_ifp)->if_type == IFT_L2VLAN ? (*vlan_tag_p)((_ifp), (_tag)) : EINVAL +#define VLAN_COOKIE(_ifp) \ + (_ifp)->if_type == IFT_L2VLAN ? (*vlan_cookie_p)((_ifp)) : NULL +#define VLAN_SETCOOKIE(_ifp, _cookie) \ + (_ifp)->if_type == IFT_L2VLAN ? \ + (*vlan_setcookie_p)((_ifp), (_cookie)) : EINVAL +#define VLAN_DEVAT(_ifp, _tag) \ + (_ifp)->if_vlantrunk != NULL ? (*vlan_devat_p)((_ifp), (_tag)) : NULL I think it is entirely safe to convert these checks inside functions into assertions. -- Gleb Smirnoff
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