pktgen: Add output for imix results

The bps for imix mode is calculated by:
sum(imix_entry.size) / time_elapsed

The actual counts of each imix_entry are displayed under the
"Current:" section of the interface output in the following format:
imix_size_counts: size_1,count_1 size_2,count_2 ... size_n,count_n

Example (count = 200000):
imix_weights: 256,1 859,3 205,2
imix_size_counts: 256,32082 859,99796 205,68122
Result: OK: 17992362(c17964678+d27684) usec, 200000 (859byte,0frags)
  11115pps 47Mb/sec (47977140bps) errors: 0

Summary of changes:
Calculate bps based on imix counters when in IMIX mode.
Add output for IMIX counters.
Signed-off-by: Nick Richardson <richardsonnick@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/pktgen.c

@@ -695,6 +695,18 @@ static int pktgen_if_show(struct seq_file *seq, void *v)
 		   (unsigned long long)pkt_dev->sofar,
 		   (unsigned long long)pkt_dev->errors);
 
+	if (pkt_dev->n_imix_entries > 0) {
+		int i;
+
+		seq_puts(seq, "     imix_size_counts: ");
+		for (i = 0; i < pkt_dev->n_imix_entries; i++) {
+			seq_printf(seq, "%llu,%llu ",
+				   pkt_dev->imix_entries[i].size,
+				   pkt_dev->imix_entries[i].count_so_far);
+		}
+		seq_puts(seq, "\n");
+	}
+
 	seq_printf(seq,
 		   "     started: %lluus  stopped: %lluus idle: %lluus\n",
 		   (unsigned long long) ktime_to_us(pkt_dev->started_at),
@@ -3277,7 +3289,19 @@ static void show_results(struct pktgen_dev *pkt_dev, int nr_frags)
 	pps = div64_u64(pkt_dev->sofar * NSEC_PER_SEC,
 			ktime_to_ns(elapsed));
 
-	bps = pps * 8 * pkt_dev->cur_pkt_size;
+	if (pkt_dev->n_imix_entries > 0) {
+		int i;
+		struct imix_pkt *entry;
+
+		bps = 0;
+		for (i = 0; i < pkt_dev->n_imix_entries; i++) {
+			entry = &pkt_dev->imix_entries[i];
+			bps += entry->size * entry->count_so_far;
+		}
+		bps = div64_u64(bps * 8 * NSEC_PER_SEC, ktime_to_ns(elapsed));
+	} else {
+		bps = pps * 8 * pkt_dev->cur_pkt_size;
+	}
 
 	mbps = bps;
 	do_div(mbps, 1000000);