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Date: Tue, 5 Feb 2019 14:08:41 +0200
From: Eran Ben Elisha <eranbe@...lanox.com>
To: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Cc: Saeed Mahameed <saeedm@...lanox.com>,
Jiri Pirko <jiri@...lanox.com>,
Moshe Shemesh <moshe@...lanox.com>,
Aya Levin <ayal@...lanox.com>,
Eran Ben Elisha <eranbe@...lanox.com>
Subject: [PATCH v3 net-next 00/11] Devlink health reporting and recovery system
The health mechanism is targeted for Real Time Alerting, in order to know when
something bad had happened to a PCI device
- Provide alert debug information
- Self healing
- If problem needs vendor support, provide a way to gather all needed debugging
information.
The main idea is to unify and centralize driver health reports in the
generic devlink instance and allow the user to set different
attributes of the health reporting and recovery procedures.
The devlink health reporter:
Device driver creates a "health reporter" per each error/health type.
Error/Health type can be a known/generic (eg pci error, fw error, rx/tx error)
or unknown (driver specific).
For each registered health reporter a driver can issue error/health reports
asynchronously. All health reports handling is done by devlink.
Device driver can provide specific callbacks for each "health reporter", e.g.
- Recovery procedures
- Diagnostics and object dump procedures
- OOB initial attributes
Different parts of the driver can register different types of health reporters
with different handlers.
Once an error is reported, devlink health will do the following actions:
* A log is being send to the kernel trace events buffer
* Health status and statistics are being updated for the reporter instance
* Object dump is being taken and saved at the reporter instance (as long as
there is no other dump which is already stored)
* Auto recovery attempt is being done. Depends on:
- Auto-recovery configuration
- Grace period vs. time passed since last recover
The user interface:
User can access/change each reporter attributes and driver specific callbacks
via devlink, e.g per error type (per health reporter)
- Configure reporter's generic attributes (like: Disable/enable auto recovery)
- Invoke recovery procedure
- Run diagnostics
- Object dump
The devlink health interface (via netlink):
DEVLINK_CMD_HEALTH_REPORTER_GET
Retrieves status and configuration info per DEV and reporter.
DEVLINK_CMD_HEALTH_REPORTER_SET
Allows reporter-related configuration setting.
DEVLINK_CMD_HEALTH_REPORTER_RECOVER
Triggers a reporter's recovery procedure.
DEVLINK_CMD_HEALTH_REPORTER_DIAGNOSE
Retrieves diagnostics data from a reporter on a device.
DEVLINK_CMD_HEALTH_REPORTER_DUMP_GET
Retrieves the last stored dump. Devlink health
saves a single dump. If an dump is not already stored by the devlink
for this reporter, devlink generates a new dump.
dump output is defined by the reporter.
DEVLINK_CMD_HEALTH_REPORTER_DUMP_CLEAR
Clears the last saved dump file for the specified reporter.
netlink
+--------------------------+
| |
| + |
| | |
+--------------------------+
|request for ops
|(diagnose,
mlx5_core devlink |recover,
|dump)
+--------+ +--------------------------+
| | | reporter| |
| | | +---------v----------+ |
| | ops execution | | | |
| <----------------------------------+ | |
| | | | | |
| | | + ^------------------+ |
| | | | request for ops |
| | | | (recover, dump) |
| | | | |
| | | +-+------------------+ |
| | health report | | health handler | |
| +-------------------------------> | |
| | | +--------------------+ |
| | health reporter create | |
| +----------------------------> |
+--------+ +--------------------------+
In this patchset, mlx5e TX reporter is implemented.
Cmdline format:
devlink health show [DEV reporter REPORTE_NAME]
devlink health recover DEV reporter REPORTER_NAME
devlink health diagnose DEV reporter REPORTER_NAME
devlink health dump show DEV reporter REPORTER_NAME
devlink health dump clear DEV reporter REPORTER_NAME
devlink health set DEV reporter REPORTER_NAME NAME VALUE
Cmdline examples:
$devlink health show
pci/0000:00:09.0:
name tx
state healthy #err 1 #recover 0 last_dump_ts N/A
parameters:
grace_period 500 auto_recover false
$devlink health diagnose pci/0000:00:09.0 reporter tx -j -p
{
"SQs": [ {
"sqn": 138,
"HW state": 1,
"stopped": false
},{
"sqn": 142,
"HW state": 1,
"stopped": false
} ]
}
$devlink health diagnose pci/0000:00:09.0 reporter tx
SQs:
sqn: 138 HW state: 1 stopped: false
sqn: 142 HW state: 1 stopped: false
$devlink health recover pci/0000:00:09 reporter tx
$devlink health set pci/0000:00:09.0 reporter tx grace_period 3500
$devlink health set pci/0000:00:09.0 reporter tx auto_recover false
Aya Levin (1):
devlink: Add Documentation/networking/devlink-health.txt
Eran Ben Elisha (10):
devlink: Add devlink formatted message (fmsg) API
devlink: Add health reporter create/destroy functionality
devlink: Add health report functionality
devlink: Add health get command
devlink: Add health set command
devlink: Add health recover command
devlink: Add health diagnose command
devlink: Add health dump {get,clear} commands
net/mlx5e: Add tx reporter support
net/mlx5e: Add tx timeout support for mlx5e tx reporter
Documentation/networking/devlink-health.txt | 86 ++
.../net/ethernet/mellanox/mlx5/core/Makefile | 2 +-
drivers/net/ethernet/mellanox/mlx5/core/en.h | 18 +-
.../ethernet/mellanox/mlx5/core/en/reporter.h | 15 +
.../mellanox/mlx5/core/en/reporter_tx.c | 297 +++++
.../net/ethernet/mellanox/mlx5/core/en_main.c | 189 +---
.../net/ethernet/mellanox/mlx5/core/en_tx.c | 5 +-
include/net/devlink.h | 211 ++++
include/trace/events/devlink.h | 62 +
include/uapi/linux/devlink.h | 24 +
net/core/devlink.c | 1008 +++++++++++++++++
11 files changed, 1752 insertions(+), 165 deletions(-)
create mode 100644 Documentation/networking/devlink-health.txt
create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en/reporter.h
create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
--
2.17.1
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