pktgen: Fix multiqueue handling

It is not currently possible to instruct pktgen to use one selected tx queue.

When Robert added multiqueue support in commit 45b270f8, he added
an interval (queue_map_min, queue_map_max), and his code doesnt take
into account the case of min = max, to select one tx queue exactly.

I suspect a high performance setup on a eight txqueue device wants
to use exactly eight cpus, and assign one tx queue to each sender.

This patchs makes pktgen select the right tx queue, not the first one.

Also updates Documentation to reflect Robert changes.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Robert Olsson <robert.olsson@its.uu.se>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/pktgen.txt b/Documentation/networking/pktgen.txt
index c6cf4a3c16e029258e3c6790ee3b5da441259eff..61bb645d50e061d7450f3f75d8805d2ca9308501 100644 (file)
--- a/Documentation/networking/pktgen.txt
+++ b/Documentation/networking/pktgen.txt
@@ -90,6 +90,11 @@ Examples:
  pgset "dstmac 00:00:00:00:00:00"    sets MAC destination address
  pgset "srcmac 00:00:00:00:00:00"    sets MAC source address
 
+ pgset "queue_map_min 0" Sets the min value of tx queue interval
+ pgset "queue_map_max 7" Sets the max value of tx queue interval, for multiqueue devices
+                         To select queue 1 of a given device,
+                         use queue_map_min=1 and queue_map_max=1
+
  pgset "src_mac_count 1" Sets the number of MACs we'll range through.  
                          The 'minimum' MAC is what you set with srcmac.
 
@@ -101,6 +106,9 @@ Examples:
                               IPDST_RND, UDPSRC_RND,
                               UDPDST_RND, MACSRC_RND, MACDST_RND 
                               MPLS_RND, VID_RND, SVID_RND
+                              QUEUE_MAP_RND # queue map random
+                              QUEUE_MAP_CPU # queue map mirrors smp_processor_id()
+
 
  pgset "udp_src_min 9"   set UDP source port min, If < udp_src_max, then
                          cycle through the port range.

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index b69455217ed6270fae1b3d6c4b011cf53b7a7f95..421857c8c07190b7280d0ba8282068038d343910 100644 (file)
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -2212,7 +2212,7 @@ static void set_cur_queue_map(struct pktgen_dev *pkt_dev)
        if (pkt_dev->flags & F_QUEUE_MAP_CPU)
                pkt_dev->cur_queue_map = smp_processor_id();
 
-       else if (pkt_dev->queue_map_min < pkt_dev->queue_map_max) {
+       else if (pkt_dev->queue_map_min <= pkt_dev->queue_map_max) {
                __u16 t;
                if (pkt_dev->flags & F_QUEUE_MAP_RND) {
                        t = random32() %