netdev - Re: [PATCH iproute2 net-next v1 3/6] taprio: Add support for enabling offload mode

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Date:   Thu, 6 Jun 2019 14:46:40 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     "Patel, Vedang" <vedang.patel@...el.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "Gomes, Vinicius" <vinicius.gomes@...el.com>,
        "Dorileo, Leandro" <leandro.maciel.dorileo@...el.com>,
        "jakub.kicinski@...ronome.com" <jakub.kicinski@...ronome.com>,
        "m-karicheri2@...com" <m-karicheri2@...com>
Subject: Re: [PATCH iproute2 net-next v1 3/6] taprio: Add support for
 enabling offload mode

On Thu, 6 Jun 2019 21:13:50 +0000
"Patel, Vedang" <vedang.patel@...el.com> wrote:

> > On Jun 6, 2019, at 12:43 PM, Stephen Hemminger <stephen@...workplumber.org> wrote:
> > 
> > On Thu,  6 Jun 2019 10:52:18 -0700
> > Vedang Patel <vedang.patel@...el.com> wrote:
> >   
> >> @@ -405,6 +420,7 @@ static int taprio_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
> >> 	struct rtattr *tb[TCA_TAPRIO_ATTR_MAX + 1];
> >> 	struct tc_mqprio_qopt *qopt = 0;
> >> 	__s32 clockid = CLOCKID_INVALID;
> >> +	__u32 offload_flags = 0;
> >> 	int i;
> >> 
> >> 	if (opt == NULL)
> >> @@ -442,6 +458,11 @@ static int taprio_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
> >> 
> >> 	print_string(PRINT_ANY, "clockid", "clockid %s", get_clock_name(clockid));
> >> 
> >> +	if (tb[TCA_TAPRIO_ATTR_OFFLOAD_FLAGS])
> >> +		offload_flags = rta_getattr_u32(tb[TCA_TAPRIO_ATTR_OFFLOAD_FLAGS]);
> >> +
> >> +	print_uint(PRINT_ANY, "offload", " offload %x", offload_flags);  
> > 
> > I don't think offload flags should be  printed at all if not present.
> > 
> > Why not?  
> Will make this in the next version.

Mostly this is so that output doesn't change for users who aren't using offload or have old kernel.