[dpdk-stable] [PATCH] net/softnic: fix pipeline time calculation

[Singh, Jasvinder]

> -----Original Message-----
> From: Wang, Xiao W
> Sent: Wednesday, May 15, 2019 2:59 PM
> To: Singh, Jasvinder <jasvinder.singh at intel.com>
> Cc: dev at dpdk.org; Dumitrescu, Cristian <cristian.dumitrescu at intel.com>;
> Wang, Xiao W <xiao.w.wang at intel.com>; stable at dpdk.org
> Subject: [PATCH] net/softnic: fix pipeline time calculation
> 
> When a new pipeline is added to a thread, the "time_next_min" value may
> need update, otherwise this pipeline won't get served timely.
> 
> Fixes: 70709c78fda6 ("net/softnic: add command to enable/disable pipeline")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Xiao Wang <xiao.w.wang at intel.com>
> ---
>  drivers/net/softnic/rte_eth_softnic_thread.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/net/softnic/rte_eth_softnic_thread.c
> b/drivers/net/softnic/rte_eth_softnic_thread.c
> index 855408e98..2b482117d 100644
> --- a/drivers/net/softnic/rte_eth_softnic_thread.c
> +++ b/drivers/net/softnic/rte_eth_softnic_thread.c
> @@ -337,6 +337,9 @@ softnic_thread_pipeline_enable(struct pmd_internals
> *softnic,
>  		tdp->timer_period = (rte_get_tsc_hz() * p->timer_period_ms) /
> 1000;
>  		tdp->time_next = rte_get_tsc_cycles() + tdp->timer_period;
> 
> +		if (tdp->time_next < td->time_next_min)
> +			td->time_next_min = tdp->time_next;
> +
>  		td->n_pipelines++;
> 
>  		/* Pipeline */
> @@ -522,6 +525,9 @@ thread_msg_handle_pipeline_enable(struct
> softnic_thread_data *t,
>  		(rte_get_tsc_hz() * req->pipeline_enable.timer_period_ms) /
> 1000;
>  	p->time_next = rte_get_tsc_cycles() + p->timer_period;
> 
> +	if (p->time_next < t->time_next_min)
> +		t->time_next_min = p->time_next;
> +
>  	t->n_pipelines++;
> 
>  	/* Response */
> --
> 2.15.1


Hi Wang, 

Timer values for pipelines and thread level message handlers are already adjusted in runtime function rte_pmd_softnic_run_internal(). In runtime function, the values of t->time_next_min is updated as well. IMO, above changes not needed. Could you help with the case where timer adjustments in runtime not working?

Thanks,
Jasvinder