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net: devlink: store copy netdevice ifindex and ifname to allow port_fill() without RTNL held 

To avoid a need to take RTNL mutex in port_fill() function, benefit from
the introduce infrastructure that tracks netdevice notifier events.
Store the ifindex and ifname upon register and change name events.
Remove the rtnl_held bool propagated down to port_fill() function as it
is no longer needed.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jiri Pirko 2022-11-02 17:02:07 +01:00 committed by Jakub Kicinski
parent d0f5172629
commit 31265c1e29
2 changed files with 29 additions and 41 deletions
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2
include/net/devlink.h
View File

@ -129,6 +129,8 @@ struct devlink_port {
union {
struct {
struct net_device *netdev;
int ifindex;
char ifname[IFNAMSIZ];
} type_eth;
struct {
struct ib_device *ibdev;

68
net/core/devlink.c
View File

@ -1279,8 +1279,7 @@ out:
static int devlink_nl_port_fill(struct sk_buff *msg,
struct devlink_port *devlink_port,
enum devlink_command cmd, u32 portid, u32 seq,
int flags, struct netlink_ext_ack *extack,
bool rtnl_held)
int flags, struct netlink_ext_ack *extack)
{
struct devlink *devlink = devlink_port->devlink;
void *hdr;
@ -1294,9 +1293,6 @@ static int devlink_nl_port_fill(struct sk_buff *msg,
if (nla_put_u32(msg, DEVLINK_ATTR_PORT_INDEX, devlink_port->index))
goto nla_put_failure;
/* Hold rtnl lock while accessing port's netdev attributes. */
if (!rtnl_held)
rtnl_lock();
spin_lock_bh(&devlink_port->type_lock);
if (nla_put_u16(msg, DEVLINK_ATTR_PORT_TYPE, devlink_port->type))
goto nla_put_failure_type_locked;
@ -1305,13 +1301,11 @@ static int devlink_nl_port_fill(struct sk_buff *msg,
devlink_port->desired_type))
goto nla_put_failure_type_locked;
if (devlink_port->type == DEVLINK_PORT_TYPE_ETH) {
struct net_device *netdev = devlink_port->type_eth.netdev;
if (netdev &&
if (devlink_port->type_eth.netdev &&
(nla_put_u32(msg, DEVLINK_ATTR_PORT_NETDEV_IFINDEX,
netdev->ifindex) ||
devlink_port->type_eth.ifindex) ||
nla_put_string(msg, DEVLINK_ATTR_PORT_NETDEV_NAME,
netdev->name)))
devlink_port->type_eth.ifname)))
goto nla_put_failure_type_locked;
}
if (devlink_port->type == DEVLINK_PORT_TYPE_IB) {
@ -1323,8 +1317,6 @@ static int devlink_nl_port_fill(struct sk_buff *msg,
goto nla_put_failure_type_locked;
}
spin_unlock_bh(&devlink_port->type_lock);
if (!rtnl_held)
rtnl_unlock();
if (devlink_nl_port_attrs_put(msg, devlink_port))
goto nla_put_failure;
if (devlink_nl_port_function_attrs_put(msg, devlink_port, extack))
@ -1339,15 +1331,13 @@ static int devlink_nl_port_fill(struct sk_buff *msg,
nla_put_failure_type_locked:
spin_unlock_bh(&devlink_port->type_lock);
if (!rtnl_held)
rtnl_unlock();
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
static void __devlink_port_notify(struct devlink_port *devlink_port,
enum devlink_command cmd, bool rtnl_held)
static void devlink_port_notify(struct devlink_port *devlink_port,
enum devlink_command cmd)
{
struct devlink *devlink = devlink_port->devlink;
struct sk_buff *msg;
@ -1362,8 +1352,7 @@ static void __devlink_port_notify(struct devlink_port *devlink_port,
if (!msg)
return;
err = devlink_nl_port_fill(msg, devlink_port, cmd, 0, 0, 0, NULL,
rtnl_held);
err = devlink_nl_port_fill(msg, devlink_port, cmd, 0, 0, 0, NULL);
if (err) {
nlmsg_free(msg);
return;
@ -1373,12 +1362,6 @@ static void __devlink_port_notify(struct devlink_port *devlink_port,
0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
}
static void devlink_port_notify(struct devlink_port *devlink_port,
enum devlink_command cmd)
{
__devlink_port_notify(devlink_port, cmd, false);
}
static void devlink_rate_notify(struct devlink_rate *devlink_rate,
enum devlink_command cmd)
{
@ -1542,7 +1525,7 @@ static int devlink_nl_cmd_port_get_doit(struct sk_buff *skb,
err = devlink_nl_port_fill(msg, devlink_port, DEVLINK_CMD_PORT_NEW,
info->snd_portid, info->snd_seq, 0,
info->extack, false);
info->extack);
if (err) {
nlmsg_free(msg);
return err;
@ -1572,8 +1555,7 @@ static int devlink_nl_cmd_port_get_dumpit(struct sk_buff *msg,
DEVLINK_CMD_NEW,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NLM_F_MULTI, cb->extack,
false);
NLM_F_MULTI, cb->extack);
if (err) {
devl_unlock(devlink);
devlink_put(devlink);
@ -1785,8 +1767,7 @@ static int devlink_port_new_notify(struct devlink *devlink,
}
err = devlink_nl_port_fill(msg, devlink_port, DEVLINK_CMD_NEW,
info->snd_portid, info->snd_seq, 0, NULL,
false);
info->snd_portid, info->snd_seq, 0, NULL);
if (err)
goto out;
@ -10062,7 +10043,7 @@ static void devlink_port_type_netdev_checks(struct devlink_port *devlink_port,
static void __devlink_port_type_set(struct devlink_port *devlink_port,
enum devlink_port_type type,
void *type_dev, bool rtnl_held)
void *type_dev)
{
struct net_device *netdev = type_dev;
@ -10081,6 +10062,13 @@ static void __devlink_port_type_set(struct devlink_port *devlink_port,
switch (type) {
case DEVLINK_PORT_TYPE_ETH:
devlink_port->type_eth.netdev = netdev;
if (netdev) {
ASSERT_RTNL();
devlink_port->type_eth.ifindex = netdev->ifindex;
BUILD_BUG_ON(sizeof(devlink_port->type_eth.ifname) !=
sizeof(netdev->name));
strcpy(devlink_port->type_eth.ifname, netdev->name);
}
break;
case DEVLINK_PORT_TYPE_IB:
devlink_port->type_ib.ibdev = type_dev;
@ -10089,7 +10077,7 @@ static void __devlink_port_type_set(struct devlink_port *devlink_port,
break;
}
spin_unlock_bh(&devlink_port->type_lock);
__devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_NEW, rtnl_held);
devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_NEW);
}
/**
@ -10104,8 +10092,7 @@ void devlink_port_type_eth_set(struct devlink_port *devlink_port)
dev_warn(devlink_port->devlink->dev,
"devlink port type for port %d set to Ethernet without a software interface reference, device type not supported by the kernel?\n",
devlink_port->index);
__devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH, NULL,
false);
__devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH, NULL);
}
EXPORT_SYMBOL_GPL(devlink_port_type_eth_set);
@ -10118,8 +10105,7 @@ EXPORT_SYMBOL_GPL(devlink_port_type_eth_set);
void devlink_port_type_ib_set(struct devlink_port *devlink_port,
struct ib_device *ibdev)
{
__devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_IB, ibdev,
false);
__devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_IB, ibdev);
}
EXPORT_SYMBOL_GPL(devlink_port_type_ib_set);
@ -10137,8 +10123,7 @@ void devlink_port_type_clear(struct devlink_port *devlink_port)
dev_warn(devlink_port->devlink->dev,
"devlink port type for port %d cleared without a software interface reference, device type not supported by the kernel?\n",
devlink_port->index);
__devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_NOTSET, NULL,
false);
__devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_NOTSET, NULL);
}
EXPORT_SYMBOL_GPL(devlink_port_type_clear);
@ -10161,16 +10146,17 @@ static int devlink_netdevice_event(struct notifier_block *nb,
* netdevice register
*/
__devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH,
NULL, true);
NULL);
break;
case NETDEV_REGISTER:
case NETDEV_CHANGENAME:
/* Set the netdev on top of previously set type. Note this
* event happens also during net namespace change so here
* we take into account netdev pointer appearing in this
* namespace.
*/
__devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH,
netdev, true);
netdev);
break;
case NETDEV_UNREGISTER:
/* Clear netdev pointer, but not the type. This event happens
@ -10178,14 +10164,14 @@ static int devlink_netdevice_event(struct notifier_block *nb,
* pointer to netdev that is going to another net namespace.
*/
__devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH,
NULL, true);
NULL);
break;
case NETDEV_PRE_UNINIT:
/* Clear the type and the netdev pointer. Happens one during
* netdevice unregister.
*/
__devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_NOTSET,
NULL, true);
NULL);
break;
}