netdev - Re: [PATCH iproute2 v3] tc: Show classes in tree view

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Date:	Wed, 24 Dec 2014 12:14:16 -0800
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Vadim Kochan <vadim4j@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH iproute2 v3] tc: Show classes in tree view

On Wed, 24 Dec 2014 02:46:16 +0200
Vadim Kochan <vadim4j@...il.com> wrote:

> From: Vadim Kochan <vadim4j@...il.com>
> 
> Added new '-t[ree]' which shows classes dependency
> in the tree view. Meanwhile only generic stats info
> is supported.
> 
> e.g.:
> 
> $ tc/tc -t class show dev tap0
> +---(1:2) htb rate 6Mbit ceil 6Mbit burst 15Kb cburst 1599b
> |    +---(1:40) htb prio 0 rate 5Mbit ceil 5Mbit burst 15Kb cburst 1600b
> |    +---(1:50) htb rate 3Mbit ceil 6Mbit burst 15Kb cburst 1599b
> |    |    +---(1:51) htb prio 0 rate 1Kbit ceil 6Mbit burst 15Kb cburst 1599b
> |    |
> |    +---(1:60) htb prio 0 rate 1Kbit ceil 6Mbit burst 15Kb cburst 1599b
> |
> +---(1:1) htb rate 6Mbit ceil 6Mbit burst 15Kb cburst 1599b
>      +---(1:10) htb prio 0 rate 5Mbit ceil 5Mbit burst 15Kb cburst 1600b
>      +---(1:20) htb prio 0 rate 3Mbit ceil 6Mbit burst 15Kb cburst 1599b
>      +---(1:30) htb prio 0 rate 1Kbit ceil 6Mbit burst 15Kb cburst 1599b
> 
> $ tc/tc -t -s class show dev tap0
> +---(1:2) htb rate 6Mbit ceil 6Mbit burst 15Kb cburst 1599b
> |    |    Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> |    |    rate 0bit 0pps backlog 0b 0p requeues 0
> |    |
> |    +---(1:40) htb prio 0 rate 5Mbit ceil 5Mbit burst 15Kb cburst 1600b
> |    |          Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> |    |          rate 0bit 0pps backlog 0b 0p requeues 0
> |    |
> |    +---(1:50) htb rate 3Mbit ceil 6Mbit burst 15Kb cburst 1599b
> |    |    |     Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> |    |    |     rate 0bit 0pps backlog 0b 0p requeues 0
> |    |    |
> |    |    +---(1:51) htb prio 0 rate 1Kbit ceil 6Mbit burst 15Kb cburst 1599b
> |    |               Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> |    |               rate 0bit 0pps backlog 0b 0p requeues 0
> |    |
> |    +---(1:60) htb prio 0 rate 1Kbit ceil 6Mbit burst 15Kb cburst 1599b
> |               Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> |               rate 0bit 0pps backlog 0b 0p requeues 0
> |
> +---(1:1) htb rate 6Mbit ceil 6Mbit burst 15Kb cburst 1599b
>      |    Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>      |    rate 0bit 0pps backlog 0b 0p requeues 0
>      |
>      +---(1:10) htb prio 0 rate 5Mbit ceil 5Mbit burst 15Kb cburst 1600b
>      |          Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>      |          rate 0bit 0pps backlog 0b 0p requeues 0
>      |
>      +---(1:20) htb prio 0 rate 3Mbit ceil 6Mbit burst 15Kb cburst 1599b
>      |          Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>      |          rate 0bit 0pps backlog 0b 0p requeues 0
>      |
>      +---(1:30) htb prio 0 rate 1Kbit ceil 6Mbit burst 15Kb cburst 1599b
>                 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>                 rate 0bit 0pps backlog 0b 0p requeues 0
> 
> Signed-off-by: Vadim Kochan <vadim4j@...il.com>
> ---
> Changes v3:
>     Fixed wrong brackets style
> 
> Changes v2:
>     Removed "Date:" from commit message which was added by mistake.
> 
> Changes RFC -> PATCH:
>     #1 get rid of INIT_HLIST_NODE
>     #2 added sample output to commit message
>     #3 use "show_tree=1" instead of "show_tree++"
>     #4 no need update include/hlist.h (because of #1)
>     #5 changed a little tree output: parentheses around class id instead of qdisc name
> 
>  tc/tc.c        |   5 +-
>  tc/tc_class.c  | 161 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  tc/tc_common.h |   2 +
>  3 files changed, 165 insertions(+), 3 deletions(-)

I don't get strict about checkpatch. But ran this patch through and there are some minor
things that would be good to fix.
  1. Split long lines like:
WARNING: line over 80 characters
#198: FILE: tc/tc_class.c:219:
+static void tree_cls_show(FILE *fp, char *buf, struct hlist_head *root_list, int level)

  2. Don't use variable name 'childs', makes sense to call it children instead??

  3. Don't use space before * as in:
ERROR: "foo * bar" should be "foo *bar"
#285: FILE: tc/tc_class.c:305:
+	struct rtattr * tb[TCA_MAX+1] = {};




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