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Message-Id: <20211123012447.841500-1-kuba@kernel.org>
Date: Mon, 22 Nov 2021 17:24:47 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, jiri@...nulli.us, atenart@...nel.org,
aroulin@...ulusnetworks.com, roopa@...dia.com,
Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next v2] net: remove .ndo_change_proto_down
.ndo_change_proto_down was added seemingly to enable out-of-tree
implementations. Over 2.5yrs later we still have no real users
upstream. Hardwire the generic implementation for now, we can
revert once real users materialize. (rocker is a test vehicle,
not a user.)
We need to drop the optimization on the sysfs side, because
unlike ndos priv_flags will be changed at runtime, so we'd
need READ_ONCE/WRITE_ONCE everywhere..
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
v2: kdoc fix
---
drivers/net/ethernet/rocker/rocker_main.c | 12 -----------
drivers/net/macvlan.c | 3 +--
drivers/net/vxlan.c | 3 +--
include/linux/netdevice.h | 12 +++--------
net/8021q/vlanproc.c | 2 +-
net/core/dev.c | 26 ++++-------------------
net/core/net-sysfs.c | 8 -------
net/core/rtnetlink.c | 3 +--
8 files changed, 11 insertions(+), 58 deletions(-)
diff --git a/drivers/net/ethernet/rocker/rocker_main.c b/drivers/net/ethernet/rocker/rocker_main.c
index ba4062881eed..b620470c7905 100644
--- a/drivers/net/ethernet/rocker/rocker_main.c
+++ b/drivers/net/ethernet/rocker/rocker_main.c
@@ -1995,17 +1995,6 @@ static int rocker_port_get_phys_port_name(struct net_device *dev,
return err ? -EOPNOTSUPP : 0;
}
-static int rocker_port_change_proto_down(struct net_device *dev,
- bool proto_down)
-{
- struct rocker_port *rocker_port = netdev_priv(dev);
-
- if (rocker_port->dev->flags & IFF_UP)
- rocker_port_set_enable(rocker_port, !proto_down);
- rocker_port->dev->proto_down = proto_down;
- return 0;
-}
-
static void rocker_port_neigh_destroy(struct net_device *dev,
struct neighbour *n)
{
@@ -2037,7 +2026,6 @@ static const struct net_device_ops rocker_port_netdev_ops = {
.ndo_set_mac_address = rocker_port_set_mac_address,
.ndo_change_mtu = rocker_port_change_mtu,
.ndo_get_phys_port_name = rocker_port_get_phys_port_name,
- .ndo_change_proto_down = rocker_port_change_proto_down,
.ndo_neigh_destroy = rocker_port_neigh_destroy,
.ndo_get_port_parent_id = rocker_port_get_port_parent_id,
};
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 75b453acd778..6ef5f77be4d0 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -1171,7 +1171,6 @@ static const struct net_device_ops macvlan_netdev_ops = {
#endif
.ndo_get_iflink = macvlan_dev_get_iflink,
.ndo_features_check = passthru_features_check,
- .ndo_change_proto_down = dev_change_proto_down_generic,
};
void macvlan_common_setup(struct net_device *dev)
@@ -1182,7 +1181,7 @@ void macvlan_common_setup(struct net_device *dev)
dev->max_mtu = ETH_MAX_MTU;
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
netif_keep_dst(dev);
- dev->priv_flags |= IFF_UNICAST_FLT;
+ dev->priv_flags |= IFF_UNICAST_FLT | IFF_CHANGE_PROTO_DOWN;
dev->netdev_ops = &macvlan_netdev_ops;
dev->needs_free_netdev = true;
dev->header_ops = &macvlan_hard_header_ops;
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 82bd794fceb3..fecff0a46612 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -3234,7 +3234,6 @@ static const struct net_device_ops vxlan_netdev_ether_ops = {
.ndo_fdb_dump = vxlan_fdb_dump,
.ndo_fdb_get = vxlan_fdb_get,
.ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
- .ndo_change_proto_down = dev_change_proto_down_generic,
};
static const struct net_device_ops vxlan_netdev_raw_ops = {
@@ -3305,7 +3304,7 @@ static void vxlan_setup(struct net_device *dev)
dev->hw_features |= NETIF_F_RXCSUM;
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
netif_keep_dst(dev);
- dev->priv_flags |= IFF_NO_QUEUE;
+ dev->priv_flags |= IFF_NO_QUEUE | IFF_CHANGE_PROTO_DOWN;
/* MTU range: 68 - 65535 */
dev->min_mtu = ETH_MIN_MTU;
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index df049864661d..db3bff1ae7fd 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1297,11 +1297,6 @@ struct netdev_net_notifier {
* TX queue.
* int (*ndo_get_iflink)(const struct net_device *dev);
* Called to get the iflink value of this device.
- * void (*ndo_change_proto_down)(struct net_device *dev,
- * bool proto_down);
- * This function is used to pass protocol port error state information
- * to the switch driver. The switch driver can react to the proto_down
- * by doing a phys down on the associated switch port.
* int (*ndo_fill_metadata_dst)(struct net_device *dev, struct sk_buff *skb);
* This function is used to get egress tunnel information for given skb.
* This is useful for retrieving outer tunnel header parameters while
@@ -1542,8 +1537,6 @@ struct net_device_ops {
int queue_index,
u32 maxrate);
int (*ndo_get_iflink)(const struct net_device *dev);
- int (*ndo_change_proto_down)(struct net_device *dev,
- bool proto_down);
int (*ndo_fill_metadata_dst)(struct net_device *dev,
struct sk_buff *skb);
void (*ndo_set_rx_headroom)(struct net_device *dev,
@@ -1612,6 +1605,7 @@ struct net_device_ops {
* @IFF_LIVE_RENAME_OK: rename is allowed while device is up and running
* @IFF_TX_SKB_NO_LINEAR: device/driver is capable of xmitting frames with
* skb_headlen(skb) == 0 (data starts from frag0)
+ * @IFF_CHANGE_PROTO_DOWN: device supports setting carrier via IFLA_PROTO_DOWN
*/
enum netdev_priv_flags {
IFF_802_1Q_VLAN = 1<<0,
@@ -1646,6 +1640,7 @@ enum netdev_priv_flags {
IFF_L3MDEV_RX_HANDLER = 1<<29,
IFF_LIVE_RENAME_OK = 1<<30,
IFF_TX_SKB_NO_LINEAR = 1<<31,
+ IFF_CHANGE_PROTO_DOWN = BIT_ULL(32),
};
#define IFF_802_1Q_VLAN IFF_802_1Q_VLAN
@@ -1982,7 +1977,7 @@ struct net_device {
/* Read-mostly cache-line for fast-path access */
unsigned int flags;
- unsigned int priv_flags;
+ unsigned long long priv_flags;
const struct net_device_ops *netdev_ops;
int ifindex;
unsigned short gflags;
@@ -3735,7 +3730,6 @@ int dev_get_port_parent_id(struct net_device *dev,
struct netdev_phys_item_id *ppid, bool recurse);
bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b);
int dev_change_proto_down(struct net_device *dev, bool proto_down);
-int dev_change_proto_down_generic(struct net_device *dev, bool proto_down);
void dev_change_proto_down_reason(struct net_device *dev, unsigned long mask,
u32 value);
struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again);
diff --git a/net/8021q/vlanproc.c b/net/8021q/vlanproc.c
index ec87dea23719..08bf6c839e25 100644
--- a/net/8021q/vlanproc.c
+++ b/net/8021q/vlanproc.c
@@ -252,7 +252,7 @@ static int vlandev_seq_show(struct seq_file *seq, void *offset)
stats = dev_get_stats(vlandev, &temp);
seq_printf(seq,
- "%s VID: %d REORDER_HDR: %i dev->priv_flags: %hx\n",
+ "%s VID: %d REORDER_HDR: %i dev->priv_flags: %llx\n",
vlandev->name, vlan->vlan_id,
(int)(vlan->flags & 1), vlandev->priv_flags);
diff --git a/net/core/dev.c b/net/core/dev.c
index 9c4fc8c3f981..823917de0d2b 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -8558,35 +8558,17 @@ bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b)
EXPORT_SYMBOL(netdev_port_same_parent_id);
/**
- * dev_change_proto_down - update protocol port state information
+ * dev_change_proto_down - set carrier according to proto_down.
+ *
* @dev: device
* @proto_down: new value
- *
- * This info can be used by switch drivers to set the phys state of the
- * port.
*/
int dev_change_proto_down(struct net_device *dev, bool proto_down)
{
- const struct net_device_ops *ops = dev->netdev_ops;
-
- if (!ops->ndo_change_proto_down)
+ if (!(dev->priv_flags & IFF_CHANGE_PROTO_DOWN))
return -EOPNOTSUPP;
if (!netif_device_present(dev))
return -ENODEV;
- return ops->ndo_change_proto_down(dev, proto_down);
-}
-EXPORT_SYMBOL(dev_change_proto_down);
-
-/**
- * dev_change_proto_down_generic - generic implementation for
- * ndo_change_proto_down that sets carrier according to
- * proto_down.
- *
- * @dev: device
- * @proto_down: new value
- */
-int dev_change_proto_down_generic(struct net_device *dev, bool proto_down)
-{
if (proto_down)
netif_carrier_off(dev);
else
@@ -8594,7 +8576,7 @@ int dev_change_proto_down_generic(struct net_device *dev, bool proto_down)
dev->proto_down = proto_down;
return 0;
}
-EXPORT_SYMBOL(dev_change_proto_down_generic);
+EXPORT_SYMBOL(dev_change_proto_down);
/**
* dev_change_proto_down_reason - proto down reason
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 4edd58d34f16..affe34d71d31 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -488,14 +488,6 @@ static ssize_t proto_down_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
- struct net_device *netdev = to_net_dev(dev);
-
- /* The check is also done in change_proto_down; this helps returning
- * early without hitting the trylock/restart in netdev_store.
- */
- if (!netdev->netdev_ops->ndo_change_proto_down)
- return -EOPNOTSUPP;
-
return netdev_store(dev, attr, buf, len, change_proto_down);
}
NETDEVICE_SHOW_RW(proto_down, fmt_dec);
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index fd030e02f16d..6f25c0a8aebe 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2539,13 +2539,12 @@ static int do_set_proto_down(struct net_device *dev,
struct netlink_ext_ack *extack)
{
struct nlattr *pdreason[IFLA_PROTO_DOWN_REASON_MAX + 1];
- const struct net_device_ops *ops = dev->netdev_ops;
unsigned long mask = 0;
u32 value;
bool proto_down;
int err;
- if (!ops->ndo_change_proto_down) {
+ if (!(dev->priv_flags & IFF_CHANGE_PROTO_DOWN)) {
NL_SET_ERR_MSG(extack, "Protodown not supported by device");
return -EOPNOTSUPP;
}
--
2.31.1
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