netdev - Re: [PATCH net-next-2.6] tc: report informations for multiqueue devices

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Date:	Wed, 02 Sep 2009 14:48:27 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	David Miller <davem@...emloft.net>, jarkao2@...il.com,
	cl@...ux-foundation.org, kaber@...sh.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] tc: report informations for multiqueue devices

Eric Dumazet a écrit :
> David Miller a écrit :
>> From: Eric Dumazet <eric.dumazet@...il.com>
>> Date: Wed, 02 Sep 2009 10:28:55 +0200
>>
>>> What naming convention should we choose for multiqueue devices ?
>> We could give an index field to multiple root qdiscs assigned
>> to a device.
> 
> Here is a patch then :)
> 
> Only point is that I am iterating from 0 to dev->real_num_tx_queues
> instead of dev->num_tx_queues. I hope it's fine, because there are
> allocated qdisc, but not really used.
> 
> Next patches to allow selective qdisc change/fetch (providing a TCA_QINDEX
> selector value to kernel)
> 
> Thanks
> 
> 
> [PATCH net-next-2.6] tc: report informations for multiqueue devices
> 
> qdisc and classes are not yet displayed by "tc -s -d {qdisc|class} show"
> for multiqueue devices.
> 
> We use a new TCA_QINDEX attribute, to report queue index to user space.
> iproute2 tc should be changed to eventually display this queue index as in :
> 
> $ tc -s -d qdisc
> qdisc pfifo_fast 0: dev eth0 root bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
>  Sent 52498 bytes 465 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: dev eth0 qindex 1 root bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
>  Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> 


Here is the iproute2 patch as well, to display queue indexes

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---

diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index ba3254e..b80e0f6 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -490,6 +490,7 @@ enum
 	TCA_FCNT,
 	TCA_STATS2,
 	TCA_STAB,
+	TCA_QINDEX,
 	__TCA_MAX
 };
 
diff --git a/tc/tc_class.c b/tc/tc_class.c
index 9d4eea5..1bc4bc6 100644
--- a/tc/tc_class.c
+++ b/tc/tc_class.c
@@ -196,6 +196,13 @@ int print_class(const struct sockaddr_nl *who,
 	if (filter_ifindex == 0)
 		fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
 
+	if (tb[TCA_QINDEX]) {
+		int qindex = 0;
+
+		memcpy(&qindex, RTA_DATA(tb[TCA_QINDEX]), MIN(RTA_PAYLOAD(tb[TCA_QINDEX]), sizeof(int)));
+		fprintf(fp, "qindex %d ", qindex);
+	}
+
 	if (t->tcm_parent == TC_H_ROOT)
 		fprintf(fp, "root ");
 	else {
diff --git a/tc/tc_qdisc.c b/tc/tc_qdisc.c
index c7f2988..3ec2cf4 100644
--- a/tc/tc_qdisc.c
+++ b/tc/tc_qdisc.c
@@ -232,6 +232,14 @@ int print_qdisc(const struct sockaddr_nl *who,
 	fprintf(fp, "qdisc %s %x: ", (char*)RTA_DATA(tb[TCA_KIND]), t->tcm_handle>>16);
 	if (filter_ifindex == 0)
 		fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
+
+	if (tb[TCA_QINDEX]) {
+		int qindex = 0;
+
+		memcpy(&qindex, RTA_DATA(tb[TCA_QINDEX]), MIN(RTA_PAYLOAD(tb[TCA_QINDEX]), sizeof(int)));
+		fprintf(fp, "qindex %d ", qindex);
+	}
+
 	if (t->tcm_parent == TC_H_ROOT)
 		fprintf(fp, "root ");
 	else if (t->tcm_parent) {
--
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