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Message-ID: <20240417085347.2836385-11-danieller@nvidia.com>
Date: Wed, 17 Apr 2024 11:53:47 +0300
From: Danielle Ratson <danieller@...dia.com>
To: <netdev@...r.kernel.org>
CC: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
<pabeni@...hat.com>, <corbet@....net>, <linux@...linux.org.uk>,
<sdf@...gle.com>, <kory.maincent@...tlin.com>,
<maxime.chevallier@...tlin.com>, <vladimir.oltean@....com>,
<przemyslaw.kitszel@...el.com>, <ahmed.zaki@...el.com>,
<richardcochran@...il.com>, <shayagr@...zon.com>, <paul.greenwalt@...el.com>,
<jiri@...nulli.us>, <linux-doc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <mlxsw@...dia.com>, <petrm@...dia.com>,
<idosch@...dia.com>, <danieller@...dia.com>
Subject: [PATCH net-next v3 10/10] ethtool: Veto some operations during firmware flashing process
Some operations cannot be performed during the firmware flashing process.
For example:
- Port must be down during the whole flashing process to avoid packet loss
while committing reset for example.
- Writing to EEPROM interrupts the flashing process, so operations like
ethtool dump, module reset, get and set power mode should be vetoed.
- Split port firmware flashing should be vetoed.
- Flashing firmware on a device which is already in a flashing process
should be forbidden.
Use the 'module_fw_flashing_in_progress' flag introduced in a previous
patch to veto those operations and prevent interruptions while preforming
module firmware flash.
Signed-off-by: Danielle Ratson <danieller@...dia.com>
---
net/ethtool/eeprom.c | 6 ++++++
net/ethtool/ioctl.c | 12 ++++++++++++
net/ethtool/module.c | 29 +++++++++++++++++++++++++++++
net/ethtool/netlink.c | 30 +++++++++++++++++++++++++++++-
4 files changed, 76 insertions(+), 1 deletion(-)
diff --git a/net/ethtool/eeprom.c b/net/ethtool/eeprom.c
index 6209c3a9c8f7..f36811b3ecf1 100644
--- a/net/ethtool/eeprom.c
+++ b/net/ethtool/eeprom.c
@@ -91,6 +91,12 @@ static int get_module_eeprom_by_page(struct net_device *dev,
{
const struct ethtool_ops *ops = dev->ethtool_ops;
+ if (dev->module_fw_flash_in_progress) {
+ NL_SET_ERR_MSG(extack,
+ "Module firmware flashing is in progress");
+ return -EBUSY;
+ }
+
if (dev->sfp_bus)
return sfp_get_module_eeprom_by_page(dev->sfp_bus, page_data, extack);
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 5a55270aa86e..02b23805d2be 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -658,6 +658,9 @@ static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
if (!dev->ethtool_ops->get_link_ksettings)
return -EOPNOTSUPP;
+ if (dev->module_fw_flash_in_progress)
+ return -EBUSY;
+
memset(&link_ksettings, 0, sizeof(link_ksettings));
err = dev->ethtool_ops->get_link_ksettings(dev, &link_ksettings);
if (err < 0)
@@ -1449,6 +1452,9 @@ static int ethtool_reset(struct net_device *dev, char __user *useraddr)
if (!dev->ethtool_ops->reset)
return -EOPNOTSUPP;
+ if (dev->module_fw_flash_in_progress)
+ return -EBUSY;
+
if (copy_from_user(&reset, useraddr, sizeof(reset)))
return -EFAULT;
@@ -2462,6 +2468,9 @@ int ethtool_get_module_info_call(struct net_device *dev,
const struct ethtool_ops *ops = dev->ethtool_ops;
struct phy_device *phydev = dev->phydev;
+ if (dev->module_fw_flash_in_progress)
+ return -EBUSY;
+
if (dev->sfp_bus)
return sfp_get_module_info(dev->sfp_bus, modinfo);
@@ -2499,6 +2508,9 @@ int ethtool_get_module_eeprom_call(struct net_device *dev,
const struct ethtool_ops *ops = dev->ethtool_ops;
struct phy_device *phydev = dev->phydev;
+ if (dev->module_fw_flash_in_progress)
+ return -EBUSY;
+
if (dev->sfp_bus)
return sfp_get_module_eeprom(dev->sfp_bus, ee, data);
diff --git a/net/ethtool/module.c b/net/ethtool/module.c
index 836c198d2cc4..239e7974f952 100644
--- a/net/ethtool/module.c
+++ b/net/ethtool/module.c
@@ -3,6 +3,7 @@
#include <linux/ethtool.h>
#include <linux/firmware.h>
#include <linux/sfp.h>
+#include <net/devlink.h>
#include "netlink.h"
#include "common.h"
@@ -36,6 +37,12 @@ static int module_get_power_mode(struct net_device *dev,
if (!ops->get_module_power_mode)
return 0;
+ if (dev->module_fw_flash_in_progress) {
+ NL_SET_ERR_MSG(extack,
+ "Module firmware flashing is in progress");
+ return -EBUSY;
+ }
+
return ops->get_module_power_mode(dev, &data->power, extack);
}
@@ -112,6 +119,12 @@ ethnl_set_module_validate(struct ethnl_req_info *req_info,
if (!tb[ETHTOOL_A_MODULE_POWER_MODE_POLICY])
return 0;
+ if (req_info->dev->module_fw_flash_in_progress) {
+ NL_SET_ERR_MSG(info->extack,
+ "Module firmware flashing is in progress");
+ return -EBUSY;
+ }
+
if (!ops->get_module_power_mode || !ops->set_module_power_mode) {
NL_SET_ERR_MSG_ATTR(info->extack,
tb[ETHTOOL_A_MODULE_POWER_MODE_POLICY],
@@ -219,6 +232,7 @@ static int module_flash_fw_work_init(struct ethtool_module_fw_flash *module_fw,
static int __module_flash_fw_schedule(struct net_device *dev,
struct netlink_ext_ack *extack)
{
+ struct devlink_port *devlink_port = dev->devlink_port;
const struct ethtool_ops *ops = dev->ethtool_ops;
if (!ops->set_module_eeprom_by_page ||
@@ -234,6 +248,21 @@ static int __module_flash_fw_schedule(struct net_device *dev,
return -EOPNOTSUPP;
}
+ if (dev->module_fw_flash_in_progress) {
+ NL_SET_ERR_MSG(extack, "Module firmware flashing already in progress");
+ return -EBUSY;
+ }
+
+ if (dev->flags & IFF_UP) {
+ NL_SET_ERR_MSG(extack, "Netdevice is up, so flashing is not permitted");
+ return -EBUSY;
+ }
+
+ if (devlink_port && devlink_port->attrs.split) {
+ NL_SET_ERR_MSG(extack, "Can't perform firmware flashing on a split port");
+ return -EOPNOTSUPP;
+ }
+
return 0;
}
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 1a4f6bd1ec7f..90e5b5312aa2 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -1194,6 +1194,29 @@ static struct genl_family ethtool_genl_family __ro_after_init = {
.n_mcgrps = ARRAY_SIZE(ethtool_nl_mcgrps),
};
+static int module_netdev_pre_up_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct netdev_notifier_info *info = ptr;
+ struct netlink_ext_ack *extack;
+
+ extack = netdev_notifier_info_to_extack(info);
+
+ if (event == NETDEV_PRE_UP) {
+ if (dev->module_fw_flash_in_progress) {
+ NL_SET_ERR_MSG(extack, "Can't set port up while flashing module firmware");
+ return NOTIFY_BAD;
+ }
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block ethtool_module_netdev_pre_up_notifier = {
+ .notifier_call = module_netdev_pre_up_event,
+};
+
/* module setup */
static int __init ethnl_init(void)
@@ -1206,7 +1229,12 @@ static int __init ethnl_init(void)
ethnl_ok = true;
ret = register_netdevice_notifier(ðnl_netdev_notifier);
- WARN(ret < 0, "ethtool: net device notifier registration failed");
+ if (WARN(ret < 0, "ethtool: net device notifier registration failed"))
+ return ret;
+
+ ret = register_netdevice_notifier(ðtool_module_netdev_pre_up_notifier);
+ WARN(ret < 0, "ethtool: net device port up notifier registration failed");
+
return ret;
}
--
2.43.0
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