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net: ethtool: netlink: retrieve stats from multiple sources (eMAC, pMAC)

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IEEE 802.3-2018 clause 99 defines a MAC Merge sublayer which contains an
Express MAC and a Preemptible MAC. Both MACs are hidden to higher and
lower layers and visible as a single MAC (packet classification to eMAC
or pMAC on TX is done based on priority; classification on RX is done
based on SFD).

For devices which support a MAC Merge sublayer, it is desirable to
retrieve individual packet counters from the eMAC and the pMAC, as well
as aggregate statistics (their sum).

Introduce a new ETHTOOL_A_STATS_SRC attribute which is part of the
policy of ETHTOOL_MSG_STATS_GET and, and an ETHTOOL_A_PAUSE_STATS_SRC
which is part of the policy of ETHTOOL_MSG_PAUSE_GET (accepted when
ETHTOOL_FLAG_STATS is set in the common ethtool header). Both of these
take values from enum ethtool_mac_stats_src, defaulting to "aggregate"
in the absence of the attribute.

Existing drivers do not need to pay attention to this enum which was
added to all driver-facing structures, just the ones which report the
MAC merge layer as supported.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean
2023-01-19 14:26:56 +02:00
committed by David S. Miller
parent 3700000479
commit 04692c9020
8 changed files with 129 additions and 3 deletions
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18
include/uapi/linux/ethtool.h
View File

@@ -711,6 +711,24 @@ enum ethtool_stringset {
ETH_SS_COUNT
};
/**
* enum ethtool_mac_stats_src - source of ethtool MAC statistics
* @ETHTOOL_MAC_STATS_SRC_AGGREGATE:
* if device supports a MAC merge layer, this retrieves the aggregate
* statistics of the eMAC and pMAC. Otherwise, it retrieves just the
* statistics of the single (express) MAC.
* @ETHTOOL_MAC_STATS_SRC_EMAC:
* if device supports a MM layer, this retrieves the eMAC statistics.
* Otherwise, it retrieves the statistics of the single (express) MAC.
* @ETHTOOL_MAC_STATS_SRC_PMAC:
* if device supports a MM layer, this retrieves the pMAC statistics.
*/
enum ethtool_mac_stats_src {
ETHTOOL_MAC_STATS_SRC_AGGREGATE,
ETHTOOL_MAC_STATS_SRC_EMAC,
ETHTOOL_MAC_STATS_SRC_PMAC,
};
/**
* enum ethtool_module_power_mode_policy - plug-in module power mode policy
* @ETHTOOL_MODULE_POWER_MODE_POLICY_HIGH: Module is always in high power mode.

3
include/uapi/linux/ethtool_netlink.h
View File

@@ -428,6 +428,7 @@ enum {
ETHTOOL_A_PAUSE_RX, /* u8 */
ETHTOOL_A_PAUSE_TX, /* u8 */
ETHTOOL_A_PAUSE_STATS, /* nest - _PAUSE_STAT_* */
ETHTOOL_A_PAUSE_STATS_SRC, /* u32 */
/* add new constants above here */
__ETHTOOL_A_PAUSE_CNT,
@@ -744,6 +745,8 @@ enum {
ETHTOOL_A_STATS_GRP, /* nest - _A_STATS_GRP_* */
ETHTOOL_A_STATS_SRC, /* u32 */
/* add new constants above here */
__ETHTOOL_A_STATS_CNT,
ETHTOOL_A_STATS_MAX = (__ETHTOOL_A_STATS_CNT - 1)