From: Jiri Pirko <jiri@resnulli.us>
To: Michal Kubecek <mkubecek@suse.cz>
Cc: Florian Fainelli <f.fainelli@gmail.com>,
David Miller <davem@davemloft.net>,
netdev@vger.kernel.org,
Jakub Kicinski <jakub.kicinski@netronome.com>,
Andrew Lunn <andrew@lunn.ch>,
John Linville <linville@tuxdriver.com>,
Stephen Hemminger <stephen@networkplumber.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next v5 12/22] ethtool: provide string sets with GET_STRSET request
Date: Thu, 28 Mar 2019 14:43:13 +0100 [thread overview]
Message-ID: <20190328134313.GO14297@nanopsycho> (raw)
In-Reply-To: <20190328071853.GY26076@unicorn.suse.cz>
Thu, Mar 28, 2019 at 08:18:53AM CET, mkubecek@suse.cz wrote:
>On Wed, Mar 27, 2019 at 07:25:47PM -0700, Florian Fainelli wrote:
>> > +GET_STRSET
>> > +----------
>> > +
>> > +Requests contents of a string set as provided by ioctl commands
>> > +ETHTOOL_GSSET_INFO and ETHTOOL_GSTRINGS. String sets are not user writeable so
>> > +that the corresponding SET_STRSET message is only used in kernel replies.
>> > +There are two types of string sets: global (independent of a device, e.g.
>> > +device feature names) and device specific (e.g. device private flags).
>> > +
>> > +Request contents:
>> > +
>> > + ETHA_STRSET_DEV (nested) device identification
>> > + ETHA_STRSET_COUNTS (flag) request only string counts
>>
>> Should not that be part of the nested attribute under
>> ETHA_STRSET_STRINGSET. We should probably think about adding another
>> flag which indicates that we want to get the stringset associated data,
>> see below why.
>>
>> > + ETHA_STRSET_STRINGSET (nested) string set to request
>> > + ETHA_STRINGSET_ID (u32) set id
>> > +
>> > +Kernel response contents:
>> > +
>> > + ETHA_STRSET_DEV (nested) device identification
>> > + ETHA_STRSET_STRINGSET (nested) string set to request
>>
>> string set requested?
>>
>> > + ETHA_STRINGSET_ID (u32) set id
>> > + ETHA_STRINGSET_COUNT (u32) number of strings
>> > + ETHA_STRINGSET_STRINGS (nested) array of strings
>> > + ETHA_STRING_INDEX (u32) string index
>> > + ETHA_STRING_VALUE (string) string value
>>
>> This is one of the areas where the legacy ethtool ioctl() is painful
>> because we need to request a string set to know how many of those exist
>> to allocate space for those in both kernel and user space.
>>
>> If we could find a way to have a single command that allows us to dump
>> stringset (count, values) and associated data, then we save ourselves a
>> context switch and having to pre-allocate memory accordingly.
>
>The way the proposed interface is designed, we can get both without an
>extra roundtrip but it's done the other way around, i.e. passing the
>strings with the request for data. The API allows two modes of
>operation:
>
>1. One shot requests, e.g. typical ethtool use. We use "verbose" mode
>(no ETHA_*_COMPACT flag in the request) and data is provided together
>with the names. E.g. "ethtool eth2" request would look like
>
> ETHA_SETTINGS_DEV
> ETHA_DEV_NAME = "eth2"
> ETHA_SETTINGS_INFO_MASK = ... | ETH_SETTINGS_IM_LINKMODES | ...
>
>and the reply would be
>
> ETHA_SETTINGS_DEV = {
> ETHA_DEV_INDEX = 4
> ETHA_DEV_NAME = "eth2"
> }
> ETHA_SETTINGS_LINK_INFO = {
> ...
> }
> ETHA_SETTRINGS_LINK_MODES = {
> ETHA_LINKMODES_AUTONEG = 1 (AUTONEG_ENABLE)
> ETHA_LINKMODES_OURS = {
> ETHA_BITSET_SIZE = 67
> ETHA_BITSET_BITS = {
> ETHA_BITS_BIT = {
> ETHA_BIT_INDEX = 0 (ETHTOOL_LINK_MODE_10baseT_Half_BIT)
> ETHA_BIT_NAME = "10baseT/Half"
> }
> ETHA_BITS_BIT = {
> ETHA_BIT_INDEX = 1 (ETHTOOL_LINK_MODE_10baseT_Full_BIT)
> ETHA_BIT_NAME = "10baseT/Full"
> }
> ETHA_BITS_BIT = {
> ETHA_BIT_INDEX = 2 (ETHTOOL_LINK_MODE_100baseT_Half_BIT)
> ETHA_BIT_NAME = "100baseT/Half"
> ETHA_BIT_VALUE
> }
> ETHA_BITS_BIT = {
> ETHA_BIT_INDEX = 3 (ETHTOOL_LINK_MODE_100baseT_Full_BIT)
> ETHA_BIT_NAME = "100baseT/Full"
> ETHA_BIT_VALUE
> }
> ETHA_BITS_BIT = {
> ETHA_BIT_INDEX = 5 (ETHTOOL_LINK_MODE_1000baseT_Full_BIT)
> ETHA_BIT_NAME = "1000baseT/Full"
> ETHA_BIT_VALUE
I don't like this. This should not be bitfield/set. This should be
simply nested array of enum values:
enum ethtool_link_mode {
ETHTOOL_LINK_MODE_10baseT_Half,
ETHTOOL_LINK_MODE_10baseT_Full,
ETHTOOL_LINK_MODE_100baseT_Half,
ETHTOOL_LINK_MODE_100baseT_Full,
ETHTOOL_LINK_MODE_1000baseT_Full,
};
and then there should be 2 attrs:
ETHTOOL_A_LINK_MODE_LIST_OUR /* nest */
ETHTOOL_A_LINK_MODE_LIST_PEER /* nest */
ETHTOOL_A_LINK_MODE /* u32 */
and then the message should look like:
ETHTOOL_A_LINK_MODE_LIST_OUR start nest
ETHTOOL_A_LINK_MODE = ETHTOOL_LINK_MODE_10baseT_Half
ETHTOOL_A_LINK_MODE = ETHTOOL_LINK_MODE_10baseT_Full
ETHTOOL_A_LINK_MODE = ETHTOOL_LINK_MODE_100baseT_Half
ETHTOOL_A_LINK_MODE = ETHTOOL_LINK_MODE_100baseT_Full
ETHTOOL_A_LINK_MODE = ETHTOOL_LINK_MODE_1000baseT_Full
ETHTOOL_A_LINK_MODE_LIST_OUR end nest
ETHTOOL_A_LINK_MODE_LIST_PEER start nest
ETHTOOL_A_LINK_MODE = ETHTOOL_LINK_MODE_10baseT_Half
ETHTOOL_A_LINK_MODE = ETHTOOL_LINK_MODE_10baseT_Full
ETHTOOL_A_LINK_MODE = ETHTOOL_LINK_MODE_100baseT_Half
ETHTOOL_A_LINK_MODE = ETHTOOL_LINK_MODE_100baseT_Full
ETHTOOL_A_LINK_MODE = ETHTOOL_LINK_MODE_1000baseT_Full
ETHTOOL_A_LINK_MODE_LIST_PEER end nest
Nice and simple. No bits, no strings.
> }
> }
> }
> ETHA_LINKMODES_PEER = {
> ...
> }
> ETHA_LINKMODES_SPEED = 1000 (SPEED_1000)
> ETHA_LINKMODES_DUPLEX = 1 (DUPLEX_FULL)
> }
> ...
>
>2. Long time running applications, e.g. "ethtool --monitor", wicked,
>systemd-networkd, ... For these, it would make sense to cache the
>strings and either retrieve them in advance (on start and when new
>device appears) or when they are needed for the first time. The request
>would then include the ETHA_SETTINGS_COMPACT flag and reply would be
>
> ...
> ETHA_LINKMODES_OURS = {
> ETHA_BITSET_SIZE = 67
> ETHA_BITSET_VALUE = 0x0000002c 0x00000000 0x00000000
> ETHA_BITSET_MASK = 0x0000002f 0x00000000 0x00000000
> }
>
>For "set" type requests, it's up to the application if it uses verbose
>or compact form. The verbose form is most useful when we want e.g. to
>set the values of one or two bits which may be identified by their names
>(on command line or in config file).
>
>Michal
next prev parent reply other threads:[~2019-03-28 13:43 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
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 [this message]
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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