pktgen: add full reset functionality

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>
Signed-off-by: Robert Olsson <robert.olsson@its.uu.se>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index fa4973b..a4f5ad1 100644 (file)
--- 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;