From: Jiri Pirko <jiri@resnulli.us>
To: Michal Kubecek <mkubecek@suse.cz>
Cc: David Miller <davem@davemloft.net>,
netdev@vger.kernel.org,
Jakub Kicinski <jakub.kicinski@netronome.com>,
Andrew Lunn <andrew@lunn.ch>,
Florian Fainelli <f.fainelli@gmail.com>,
John Linville <linville@tuxdriver.com>,
Stephen Hemminger <stephen@networkplumber.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next v5 05/22] ethtool: introduce ethtool netlink interface
Date: Tue, 26 Mar 2019 14:42:51 +0100 [thread overview]
Message-ID: <20190326134251.GA5181@nanopsycho.orion> (raw)
In-Reply-To: <20190326132427.GK26076@unicorn.suse.cz>
Tue, Mar 26, 2019 at 02:24:27PM CET, mkubecek@suse.cz wrote:
>On Tue, Mar 26, 2019 at 01:09:09PM +0100, Jiri Pirko wrote:
>> Mon, Mar 25, 2019 at 06:08:09PM CET, mkubecek@suse.cz wrote:
>> >+All "set" and "action" type requests require admin privileges (CAP_NET_ADMIN
>> >+in the namespace). Most "get" type request are allowed for anyone but there
>>
>> s/request/requests/
>
>Will fix.
>
>> >+Device identification
>> >+---------------------
>> >+
>> >+When appropriate, network device is identified by a nested attribute named
>> >+ETHA_*_DEV. This attribute can contain
>>
>> Isn't it ETHA_DEV_*? I must admit I'm a bit confused.
>
>ETHA_*_DEV is the nesting attribute (e.g. ETHA_SETTINGS_DEV), ETHA_DEV_*
>(ETHA_DEV_INDEX and ETHA_DEV_NAME) are in the nest.
Yeah. I wonder why you need to duplicate this. Can this be in top-lever
attr enum that is shared among all commands? It is there anyway and
looks a bit silly to have "DEV" attr separate for every command.
Something like this:
ATTR_IFINDEX
ATTR_IFNAME
ATTR_SOMEOTHER (flags perhaps)
ATTR_CMD_SPECIFIC_NEST_START
ATTR_CMDX_SOMETHING
ATTR_CMDX_SOMETHING2
ATTR_CMDX_SOMETHING3
ATTR_CMD_SPECIFIC_NEST_END
>
>>
>>
>> >+
>> >+ ETHA_DEV_INDEX (u32) device ifindex
>> >+ ETHA_DEV_NAME (string) device name
>> >+
>> >+In device related requests, one of these is sufficient; if both are used, they
>> >+must match (i.e. identify the same device). In device related replies both are
>>
>> You say this now for the second time. First time this was said in second
>> para.
>
>I'll drop one of them.
>
>> >+List of message types
>> >+---------------------
>> >+
>> >+All constants use ETHNL_CMD_ prefix, usually followed by "GET", "SET" or "ACT"
>>
>> Why "usually"? Why not "always"?
>
>Right, it's always. And if it changes one day, the sentence will have to
>be rewritten anyway.
Okay.
>
>> >+Messages of type "get" are used by userspace to request information and
>> >+usually do not contain any attributes (that may be added later for dump
>> >+filtering). Kernel response is in the form of corresponding "set" message;
>>
>> Okay. Do we want reply to "*_cmd_something_get" command to be
>> "*_cmd_something_set". That sounds odd. Why reply has to be "cmd"? Why
>> not something like "reply" or "response"?
>> This should work for both "doit/dumpit" and notifications.
>
>As stated right below, the aim is to use the same format for replies to
>GET requests as userspace uses for related SET requests. We could use
>different id (genlmsghdr::cmd) but that seemed like a waste for no actual
>gain.
I understand. I just wonder if the replies/notifications could use the
same name, not having "set" in it. I know we have it like this in many
netlink ifaces, it is however confusing to users. So once we are doing
this from scratch, we can do it differently.
>
>> >+the same message can be also used to set (some of) the parameters, except for
>> >+messages marked as "response only" in the table above. "Get" messages with
>> >+NLM_F_DUMP flags and no device identification dump the information for all
>> >+devices supporting the request.
>
>> >+
>> >+enum {
>> >+ ETHNL_CMD_NOOP,
>> >+
>>
>> Usually headers have something like:
>> /* add new commands above here */
>> here.
>
>OK
>
>> >diff --git a/net/ethtool/Makefile b/net/ethtool/Makefile
>> >index 3ebfab2bca66..f30e0da88be5 100644
>> >--- a/net/ethtool/Makefile
>> >+++ b/net/ethtool/Makefile
>> >@@ -1,3 +1,7 @@
>> > # SPDX-License-Identifier: GPL-2.0
>> >
>> >-obj-y += ioctl.o
>> >+obj-y += ioctl.o
>> >+
>> >+obj-$(CONFIG_ETHTOOL_NETLINK) += ethtool_nl.o
>>
>> Why? I believe this should be always build-in same as ioctl.
>
>I would like to make the ioctl interface optional as well, eventually.
>As someone noted in one of the earlier discussions, there may be some
>special minimalistic setups where ethtool interface may be of no use.
Okay, fair enough.
>
>> >+struct genl_family ethtool_genl_family = {
>> >+ .hdrsize = 0,
>>
>> No need to set 0.
>
>OK
>
>> >+
>> >+extern struct genl_family ethtool_genl_family;
>>
>> Why? You need this just within "netlink.c", don't you?
>
>In the submitted part, yes. But one of the later patches adds specific
>notify handler (different from ethnl_std_notify()) which is not in
>netlink.c and needs to use pointer to ethtool_genl_family for a call to
>genlmsg_put() and genlmsg_multicast().
>
>But I can make it static for now and change to extern when it's needed.
Please do.
>
>Michal
>
next prev parent reply other threads:[~2019-03-26 13:53 UTC|newest]
Thread overview: 109+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-25 17:07 [PATCH net-next v5 00/22] ethtool netlink interface, part 1 Michal Kubecek
2019-03-25 17:07 ` [PATCH net-next v5 01/22] rtnetlink: provide permanent hardware address in RTM_NEWLINK Michal Kubecek
2019-03-26 10:08 ` Jiri Pirko
2019-03-26 10:31 ` Michal Kubecek
2019-03-26 11:38 ` Jiri Pirko
2019-03-26 19:46 ` David Miller
2019-03-25 17:08 ` [PATCH net-next v5 02/22] netlink: introduce nla_put_bitfield32() Michal Kubecek
2019-03-26 10:09 ` Jiri Pirko
2019-03-28 1:56 ` Florian Fainelli
2019-03-25 17:08 ` [PATCH net-next v5 03/22] netlink: add strict version of nla_parse_nested() Michal Kubecek
2019-03-26 10:11 ` Jiri Pirko
2019-03-28 1:57 ` Florian Fainelli
2019-03-25 17:08 ` [PATCH net-next v5 04/22] ethtool: move to its own directory Michal Kubecek
2019-03-26 10:14 ` Jiri Pirko
2019-03-28 1:57 ` Florian Fainelli
2019-03-25 17:08 ` [PATCH net-next v5 05/22] ethtool: introduce ethtool netlink interface Michal Kubecek
2019-03-26 12:09 ` Jiri Pirko
2019-03-26 13:24 ` Michal Kubecek
2019-03-26 13:42 ` Jiri Pirko [this message]
2019-03-27 9:26 ` Michal Kubecek
2019-03-27 9:50 ` Jiri Pirko
2019-03-28 2:05 ` Florian Fainelli
2019-03-28 8:10 ` Jiri Pirko
2019-03-28 9:37 ` Michal Kubecek
2019-03-28 13:23 ` Jiri Pirko
2019-03-28 17:00 ` Florian Fainelli
2019-03-28 17:28 ` Jiri Pirko
2019-03-26 16:36 ` Jiri Pirko
2019-03-26 17:32 ` Michal Kubecek
2019-03-27 9:26 ` Jiri Pirko
2019-03-25 17:08 ` [PATCH net-next v5 06/22] ethtool: helper functions for " Michal Kubecek
2019-03-26 12:38 ` Jiri Pirko
2019-03-26 14:19 ` Michal Kubecek
2019-03-26 16:22 ` Jiri Pirko
2019-03-25 17:08 ` [PATCH net-next v5 07/22] ethtool: netlink bitset handling Michal Kubecek
2019-03-26 15:59 ` Jiri Pirko
2019-03-26 17:59 ` Michal Kubecek
2019-03-27 9:57 ` Jiri Pirko
2019-03-27 10:19 ` Michal Kubecek
2019-03-25 17:08 ` [PATCH net-next v5 08/22] ethtool: support for netlink notifications Michal Kubecek
2019-03-26 16:34 ` Jiri Pirko
2019-03-26 18:17 ` Michal Kubecek
2019-03-27 9:38 ` Jiri Pirko
2019-03-27 9:51 ` Andrew Lunn
2019-03-27 10:04 ` Jiri Pirko
2019-03-27 10:16 ` Andrew Lunn
2019-03-27 10:41 ` Jiri Pirko
2019-03-27 9:59 ` Michal Kubecek
2019-03-27 10:43 ` Jiri Pirko
2019-03-25 17:08 ` [PATCH net-next v5 09/22] ethtool: implement EVENT notifications Michal Kubecek
2019-03-27 13:04 ` Jiri Pirko
2019-03-27 14:14 ` Michal Kubecek
2019-03-28 2:14 ` Florian Fainelli
2019-03-28 6:41 ` Michal Kubecek
2019-03-28 9:16 ` Jiri Pirko
2019-03-25 17:08 ` [PATCH net-next v5 10/22] ethtool: generic handlers for GET requests Michal Kubecek
2019-03-27 16:35 ` Jiri Pirko
2019-03-27 21:53 ` Michal Kubecek
2019-03-28 13:32 ` Jiri Pirko
2019-03-25 17:08 ` [PATCH net-next v5 11/22] ethtool: move string arrays into common file Michal Kubecek
2019-03-28 2:17 ` Florian Fainelli
2019-03-25 17:08 ` [PATCH net-next v5 12/22] ethtool: provide string sets with GET_STRSET request Michal Kubecek
2019-03-27 20:12 ` Jiri Pirko
2019-03-27 22:56 ` Michal Kubecek
2019-03-29 8:43 ` Jiri Pirko
2019-03-28 2:25 ` Florian Fainelli
2019-03-28 7:18 ` Michal Kubecek
2019-03-28 13:43 ` Jiri Pirko
2019-03-28 14:04 ` Michal Kubecek
2019-03-28 17:35 ` Jiri Pirko
2019-03-28 18:52 ` Jakub Kicinski
2019-03-28 20:43 ` Michal Kubecek
2019-03-28 21:06 ` Jakub Kicinski
2019-03-29 6:52 ` Jiri Pirko
2019-03-28 22:28 ` Michal Kubecek
2019-03-25 17:08 ` [PATCH net-next v5 13/22] ethtool: provide driver/device information in GET_INFO request Michal Kubecek
2019-03-27 20:14 ` Jiri Pirko
2019-03-27 22:25 ` Michal Kubecek
2019-03-28 2:30 ` Florian Fainelli
2019-03-28 9:21 ` Jiri Pirko
2019-03-28 9:53 ` Michal Kubecek
2019-03-28 16:34 ` Jiri Pirko
2019-03-28 20:09 ` Jakub Kicinski
2019-03-28 22:46 ` Michal Kubecek
2019-03-29 18:48 ` Jakub Kicinski
2019-03-29 18:53 ` Florian Fainelli
2019-03-25 17:08 ` [PATCH net-next v5 14/22] ethtool: provide timestamping " Michal Kubecek
2019-03-28 3:36 ` Florian Fainelli
2019-03-28 10:03 ` Michal Kubecek
2019-03-25 17:08 ` [PATCH net-next v5 15/22] ethtool: provide link mode names as a string set Michal Kubecek
2019-03-28 3:52 ` Florian Fainelli
2019-03-25 17:08 ` [PATCH net-next v5 16/22] ethtool: provide link settings and link modes in GET_SETTINGS request Michal Kubecek
2019-03-28 3:44 ` Florian Fainelli
2019-03-28 10:04 ` Michal Kubecek
2019-03-25 17:08 ` [PATCH net-next v5 17/22] ethtool: set link settings and link modes with SET_SETTINGS request Michal Kubecek
2019-03-25 17:08 ` [PATCH net-next v5 18/22] ethtool: provide link state in GET_SETTINGS request Michal Kubecek
2019-03-25 17:08 ` [PATCH net-next v5 19/22] ethtool: provide WoL information " Michal Kubecek
2019-03-28 3:42 ` Florian Fainelli
2019-03-28 10:10 ` Michal Kubecek
2019-03-25 17:08 ` [PATCH net-next v5 20/22] ethtool: set WoL settings with SET_SETTINGS request Michal Kubecek
2019-03-28 3:49 ` Florian Fainelli
2019-03-25 17:08 ` [PATCH net-next v5 21/22] ethtool: provide message level in GET_SETTINGS request Michal Kubecek
2019-03-28 3:46 ` Florian Fainelli
2019-03-25 17:09 ` [PATCH net-next v5 22/22] ethtool: set message level with SET_SETTINGS request Michal Kubecek
2019-03-28 3:48 ` Florian Fainelli
2019-03-27 13:09 ` [PATCH net-next v5 00/22] ethtool netlink interface, part 1 Jiri Pirko
2019-03-27 14:28 ` Michal Kubecek
2019-03-27 15:19 ` Jiri Pirko
2019-03-27 19:12 ` David Miller
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