[NET-NEXT] pktgen: add full reset functionality

From: Jesse Brandeburg <jesse.brandeburg@intel.com>

While testing pktgen, I found that sometimes my configurations from
previous runs would be left over, particularly when going from a test
with 8 threads down to a test with 4 threads.

This adds new functionality to pktgen where you can call
pgset "reset"

and it will be just like you just insmod'ed pktgen again.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
CC: Robert Olsson <robert.olsson@its.uu.se>
---

 net/core/pktgen.c |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)


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Jeff Kirsher writes:
 > From: Jesse Brandeburg <jesse.brandeburg@intel.com>
 > 
 > While testing pktgen, I found that sometimes my configurations from
 > previous runs would be left over, particularly when going from a test
 > with 8 threads down to a test with 4 threads.
 > 
 > This adds new functionality to pktgen where you can call
 > pgset "reset"

 Yes thats more convenient than looping over the threads from 
 the bash scripts.


 > and it will be just like you just insmod'ed pktgen again.

 For less impact I'll think you just can run pktgen_rem_all_ifs() 
 for all threads. 

void pktgen_reset_all_threads(void)
{
.
	mutex_lock(&pktgen_thread_lock);
	list_for_each_entry(t, &pktgen_threads, th_list)
			       pktgen_rem_all_ifs(t);
	mutex_unlock(&pktgen_thread_lock);

 .

 > Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
 > Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
 > CC: Robert Olsson <robert.olsson@its.uu.se>

Signed-off-by: Robert Olsson <robert.olsson@its.uu.se>


Cheers
				--ro	


 > ---
 > 
 >  net/core/pktgen.c |   22 ++++++++++++++++++++++
 >  1 files changed, 22 insertions(+), 0 deletions(-)
 > 
 > diff --git a/net/core/pktgen.c b/net/core/pktgen.c
 > index fa4973b..a4f5ad1 100644
 > --- a/net/core/pktgen.c
 > +++ b/net/core/pktgen.c
 > @@ -422,6 +422,7 @@ static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
 >  					  const char *ifname);
 >  static int pktgen_device_event(struct notifier_block *, unsigned long, void *);
 >  static void pktgen_run_all_threads(void);
 > +static void pktgen_reset_all_threads(void);
 >  static void pktgen_stop_all_threads_ifs(void);
 >  static int pktgen_stop_device(struct pktgen_dev *pkt_dev);
 >  static void pktgen_stop(struct pktgen_thread *t);
 > @@ -480,6 +481,9 @@ static ssize_t pgctrl_write(struct file *file, const char __user * buf,
 >  	else if (!strcmp(data, "start"))
 >  		pktgen_run_all_threads();
 >  
 > +	else if (!strcmp(data, "reset"))
 > +		pktgen_reset_all_threads();
 > +
 >  	else
 >  		printk(KERN_WARNING "pktgen: Unknown command: %s\n", data);
 >  
 > @@ -3173,6 +3177,24 @@ static void pktgen_run_all_threads(void)
 >  	pktgen_wait_all_threads_run();
 >  }
 >  
 > +static void pktgen_reset_all_threads(void)
 > +{
 > +	struct pktgen_thread *t;
 > +
 > +	pr_debug("pktgen: entering pktgen_reset_all_threads.\n");
 > +
 > +	mutex_lock(&pktgen_thread_lock);
 > +
 > +	list_for_each_entry(t, &pktgen_threads, th_list)
 > +		t->control |= (T_REMDEVALL);
 > +
 > +	mutex_unlock(&pktgen_thread_lock);
 > +
 > +	schedule_timeout_interruptible(msecs_to_jiffies(125));	/* Propagate thread->control  */
 > +
 > +	pktgen_wait_all_threads_run();
 > +}
 > +
 >  static void show_results(struct pktgen_dev *pkt_dev, int nr_frags)
 >  {
 >  	__u64 total_us, bps, mbps, pps, idle;
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From: Robert Olsson <robert@robur.slu.se>
Date: Sat, 8 Nov 2008 11:21:52 +0100

> Jeff Kirsher writes:
>  > From: Jesse Brandeburg <jesse.brandeburg@intel.com>
>  > 
>  > While testing pktgen, I found that sometimes my configurations from
>  > previous runs would be left over, particularly when going from a test
>  > with 8 threads down to a test with 4 threads.
>  > 
>  > This adds new functionality to pktgen where you can call
>  > pgset "reset"
 ...
>  > Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
>  > Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
>  > CC: Robert Olsson <robert.olsson@its.uu.se>
> 
> Signed-off-by: Robert Olsson <robert.olsson@its.uu.se>

Applied, thanks everyone.
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