[net-next,v1] fix: taprio: Change type of txtime-delay parameter to u32

During the review of the iproute2 patches for txtime-assist mode, it was
pointed out that it does not make sense for the txtime-delay parameter to
be negative. So, change the type of the parameter from s32 to u32.

Fixes: 4cfd5779bd6e ("taprio: Add support for txtime-assist mode")
Reported-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Vedang Patel <vedang.patel@intel.com>
---
 include/uapi/linux/pkt_sched.h | 2 +-
 net/sched/sch_taprio.c         | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

I request that this patch should also be considered for the net tree since it fixes the data type of of the txtime_delay parameter and should go in with the iproute2 patches which implement support for txtime-assist mode. 

Thanks,
Vedang Patel

> On Jul 16, 2019, at 12:52 PM, Patel, Vedang <vedang.patel@intel.com> wrote:
> 
> During the review of the iproute2 patches for txtime-assist mode, it was
> pointed out that it does not make sense for the txtime-delay parameter to
> be negative. So, change the type of the parameter from s32 to u32.
> 
> Fixes: 4cfd5779bd6e ("taprio: Add support for txtime-assist mode")
> Reported-by: Stephen Hemminger <stephen@networkplumber.org>
> Signed-off-by: Vedang Patel <vedang.patel@intel.com>
> ---
> include/uapi/linux/pkt_sched.h | 2 +-
> net/sched/sch_taprio.c         | 6 +++---
> 2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h
> index 1f623252abe8..18f185299f47 100644
> --- a/include/uapi/linux/pkt_sched.h
> +++ b/include/uapi/linux/pkt_sched.h
> @@ -1174,7 +1174,7 @@ enum {
> 	TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME, /* s64 */
> 	TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME_EXTENSION, /* s64 */
> 	TCA_TAPRIO_ATTR_FLAGS, /* u32 */
> -	TCA_TAPRIO_ATTR_TXTIME_DELAY, /* s32 */
> +	TCA_TAPRIO_ATTR_TXTIME_DELAY, /* u32 */
> 	__TCA_TAPRIO_ATTR_MAX,
> };
> 
> diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
> index 388750ddc57a..c39db507ba3f 100644
> --- a/net/sched/sch_taprio.c
> +++ b/net/sched/sch_taprio.c
> @@ -75,7 +75,7 @@ struct taprio_sched {
> 	struct sched_gate_list __rcu *admin_sched;
> 	struct hrtimer advance_timer;
> 	struct list_head taprio_list;
> -	int txtime_delay;
> +	u32 txtime_delay;
> };
> 
> static ktime_t sched_base_time(const struct sched_gate_list *sched)
> @@ -1113,7 +1113,7 @@ static int taprio_change(struct Qdisc *sch, struct nlattr *opt,
> 			goto unlock;
> 		}
> 
> -		q->txtime_delay = nla_get_s32(tb[TCA_TAPRIO_ATTR_TXTIME_DELAY]);
> +		q->txtime_delay = nla_get_u32(tb[TCA_TAPRIO_ATTR_TXTIME_DELAY]);
> 	}
> 
> 	if (!TXTIME_ASSIST_IS_ENABLED(taprio_flags) &&
> @@ -1430,7 +1430,7 @@ static int taprio_dump(struct Qdisc *sch, struct sk_buff *skb)
> 		goto options_error;
> 
> 	if (q->txtime_delay &&
> -	    nla_put_s32(skb, TCA_TAPRIO_ATTR_TXTIME_DELAY, q->txtime_delay))
> +	    nla_put_u32(skb, TCA_TAPRIO_ATTR_TXTIME_DELAY, q->txtime_delay))
> 		goto options_error;
> 
> 	if (oper && dump_schedule(skb, oper))
> -- 
> 2.7.3
>

From: Vedang Patel <vedang.patel@intel.com>
Date: Tue, 16 Jul 2019 12:52:18 -0700

> During the review of the iproute2 patches for txtime-assist mode, it was
> pointed out that it does not make sense for the txtime-delay parameter to
> be negative. So, change the type of the parameter from s32 to u32.
> 
> Fixes: 4cfd5779bd6e ("taprio: Add support for txtime-assist mode")
> Reported-by: Stephen Hemminger <stephen@networkplumber.org>
> Signed-off-by: Vedang Patel <vedang.patel@intel.com>

You should have targetted this at 'net' as that's the only tree open
right now.

I'll apply this.

> On Jul 16, 2019, at 2:19 PM, David Miller <davem@davemloft.net> wrote:
> 
> From: Vedang Patel <vedang.patel@intel.com>
> Date: Tue, 16 Jul 2019 12:52:18 -0700
> 
>> During the review of the iproute2 patches for txtime-assist mode, it was
>> pointed out that it does not make sense for the txtime-delay parameter to
>> be negative. So, change the type of the parameter from s32 to u32.
>> 
>> Fixes: 4cfd5779bd6e ("taprio: Add support for txtime-assist mode")
>> Reported-by: Stephen Hemminger <stephen@networkplumber.org>
>> Signed-off-by: Vedang Patel <vedang.patel@intel.com>
> 
> You should have targetted this at 'net' as that's the only tree open
> right now.
> 
> I'll apply this.

Sorry about that.

I will keep this in mind from next time. 

Thanks,
Vedang