ethtool: add standard pause stats
Currently drivers have to report their pause frames statistics
via ethtool -S, and there is a wide variety of names used for
these statistics.
Add the two statistics defined in IEEE 802.3x to the standard
API. Create a new ethtool request header flag for including
statistics in the response to GET commands.
Always create the ETHTOOL_A_PAUSE_STATS nest in replies when
flag is set. Testing if driver declares the op is not a reliable
way of checking if any stats will actually be included and therefore
we don't want to give the impression that presence of
ETHTOOL_A_PAUSE_STATS indicates driver support.
Note that this patch does not include PFC counters, which may fit
better in dcbnl? But mostly I don't need them/have a setup to test
them so I haven't looked deeply into exposing them :)
v3:
- add a helper for "uninitializing" stats, rather than a cryptic
memset() (Andrew)
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 969a802..060b20f 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -241,6 +241,27 @@ bool ethtool_convert_link_mode_to_legacy_u32(u32 *legacy_u32,
ETHTOOL_COALESCE_PKT_RATE_LOW | ETHTOOL_COALESCE_PKT_RATE_HIGH | \
ETHTOOL_COALESCE_RATE_SAMPLE_INTERVAL)
+#define ETHTOOL_STAT_NOT_SET (~0ULL)
+
+/**
+ * struct ethtool_pause_stats - statistics for IEEE 802.3x pause frames
+ * @tx_pause_frames: transmitted pause frame count. Reported to user space
+ * as %ETHTOOL_A_PAUSE_STAT_TX_FRAMES.
+ *
+ * Equivalent to `30.3.4.2 aPAUSEMACCtrlFramesTransmitted`
+ * from the standard.
+ *
+ * @rx_pause_frames: received pause frame count. Reported to user space
+ * as %ETHTOOL_A_PAUSE_STAT_RX_FRAMES. Equivalent to:
+ *
+ * Equivalent to `30.3.4.3 aPAUSEMACCtrlFramesReceived`
+ * from the standard.
+ */
+struct ethtool_pause_stats {
+ u64 tx_pause_frames;
+ u64 rx_pause_frames;
+};
+
/**
* struct ethtool_ops - optional netdev operations
* @supported_coalesce_params: supported types of interrupt coalescing.
@@ -282,6 +303,9 @@ bool ethtool_convert_link_mode_to_legacy_u32(u32 *legacy_u32,
* Returns a negative error code or zero.
* @get_ringparam: Report ring sizes
* @set_ringparam: Set ring sizes. Returns a negative error code or zero.
+ * @get_pause_stats: Report pause frame statistics. Drivers must not zero
+ * statistics which they don't report. The stats structure is initialized
+ * to ETHTOOL_STAT_NOT_SET indicating driver does not report statistics.
* @get_pauseparam: Report pause parameters
* @set_pauseparam: Set pause parameters. Returns a negative error code
* or zero.
@@ -418,6 +442,8 @@ struct ethtool_ops {
struct ethtool_ringparam *);
int (*set_ringparam)(struct net_device *,
struct ethtool_ringparam *);
+ void (*get_pause_stats)(struct net_device *dev,
+ struct ethtool_pause_stats *pause_stats);
void (*get_pauseparam)(struct net_device *,
struct ethtool_pauseparam*);
int (*set_pauseparam)(struct net_device *,
