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ethtool: add standard pause stats

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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>
This commit is contained in:
Jakub Kicinski
2020-09-14 17:11:52 -07:00
committed by David S. Miller
parent 0f9ad4e759
commit 9a27a33027
4 changed files with 116 additions and 2 deletions
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18
include/uapi/linux/ethtool_netlink.h
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@@ -91,9 +91,12 @@ enum {
#define ETHTOOL_FLAG_COMPACT_BITSETS (1 << 0)
/* provide optional reply for SET or ACT requests */
#define ETHTOOL_FLAG_OMIT_REPLY (1 << 1)
/* request statistics, if supported by the driver */
#define ETHTOOL_FLAG_STATS (1 << 2)
#define ETHTOOL_FLAG_ALL (ETHTOOL_FLAG_COMPACT_BITSETS | \
ETHTOOL_FLAG_OMIT_REPLY)
ETHTOOL_FLAG_OMIT_REPLY | \
ETHTOOL_FLAG_STATS)
enum {
ETHTOOL_A_HEADER_UNSPEC,
@@ -376,12 +379,25 @@ enum {
ETHTOOL_A_PAUSE_AUTONEG, /* u8 */
ETHTOOL_A_PAUSE_RX, /* u8 */
ETHTOOL_A_PAUSE_TX, /* u8 */
ETHTOOL_A_PAUSE_STATS, /* nest - _PAUSE_STAT_* */
/* add new constants above here */
__ETHTOOL_A_PAUSE_CNT,
ETHTOOL_A_PAUSE_MAX = (__ETHTOOL_A_PAUSE_CNT - 1)
};
enum {
ETHTOOL_A_PAUSE_STAT_UNSPEC,
ETHTOOL_A_PAUSE_STAT_PAD,
ETHTOOL_A_PAUSE_STAT_TX_FRAMES,
ETHTOOL_A_PAUSE_STAT_RX_FRAMES,
/* add new constants above here */
__ETHTOOL_A_PAUSE_STAT_CNT,
ETHTOOL_A_PAUSE_STAT_MAX = (__ETHTOOL_A_PAUSE_STAT_CNT - 1)
};
/* EEE */
enum {