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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>
This commit is contained in:
Eric Dumazet 2009-10-02 20:24:59 +00:00 committed by David S. Miller
parent a825e00c98
commit 896a7cf8d8
2 changed files with 9 additions and 1 deletions
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8
Documentation/networking/pktgen.txt
View File

@ -90,6 +90,11 @@ Examples:
pgset "dstmac 00:00:00:00:00:00" sets MAC destination address 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 "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. pgset "src_mac_count 1" Sets the number of MACs we'll range through.
The 'minimum' MAC is what you set with srcmac. The 'minimum' MAC is what you set with srcmac.
@ -101,6 +106,9 @@ Examples:
IPDST_RND, UDPSRC_RND, IPDST_RND, UDPSRC_RND,
UDPDST_RND, MACSRC_RND, MACDST_RND UDPDST_RND, MACSRC_RND, MACDST_RND
MPLS_RND, VID_RND, SVID_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 pgset "udp_src_min 9" set UDP source port min, If < udp_src_max, then
cycle through the port range. cycle through the port range.

2
net/core/pktgen.c
View File

@ -2212,7 +2212,7 @@ static void set_cur_queue_map(struct pktgen_dev *pkt_dev)
if (pkt_dev->flags & F_QUEUE_MAP_CPU) if (pkt_dev->flags & F_QUEUE_MAP_CPU)
pkt_dev->cur_queue_map = smp_processor_id(); 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; __u16 t;
if (pkt_dev->flags & F_QUEUE_MAP_RND) { if (pkt_dev->flags & F_QUEUE_MAP_RND) {
t = random32() % t = random32() %