[PATCH net-next v5 0/6] udp_tunnel: remove rtnl_lock dependency

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Stanislav Fomichev

16 Jun 2025 16 Jun '25

4:21 p.m.

Recently bnxt had to grow back a bunch of rtnl dependencies because of udp_tunnel's infra. Add separate (global) mutext to protect udp_tunnel state.

v5: - remove unused variable (lkp@intel.com)

v4: - grab lock in more places, specifically netlink and notifiers (Jakub) - convert geneve and vxlan notifiers to (sleepable) rtnl lock

v3: - fix 2 test failures (Jakub NIPA)

v2: - move the lock into udp_tunnel_nic (Jakub) - reorder the lock ordering (Jakub) - move udp_ports_sleep removal into separate patch and update the test (Jakub)

Cc: Michael Chan michael.chan@broadcom.com

Stanislav Fomichev (6): geneve: rely on rtnl lock in geneve_offload_rx_ports vxlan: drop sock_lock udp_tunnel: remove rtnl_lock dependency net: remove redundant ASSERT_RTNL() in queue setup functions netdevsim: remove udp_ports_sleep Revert "bnxt_en: bring back rtnl_lock() in the bnxt_open() path"

.../net/ethernet/broadcom/bnx2x/bnx2x_main.c | 3 +- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 42 ++------- drivers/net/ethernet/emulex/benet/be_main.c | 3 +- drivers/net/ethernet/intel/i40e/i40e_main.c | 1 - drivers/net/ethernet/intel/ice/ice_main.c | 1 - .../net/ethernet/mellanox/mlx4/en_netdev.c | 3 +- .../net/ethernet/mellanox/mlx5/core/en_main.c | 3 +- .../ethernet/netronome/nfp/nfp_net_common.c | 3 +- .../net/ethernet/qlogic/qede/qede_filter.c | 3 - .../net/ethernet/qlogic/qlcnic/qlcnic_main.c | 1 - drivers/net/ethernet/sfc/ef10.c | 1 - drivers/net/geneve.c | 7 +- drivers/net/netdevsim/netdevsim.h | 2 - drivers/net/netdevsim/udp_tunnels.c | 12 --- drivers/net/vxlan/vxlan_core.c | 35 +++----- drivers/net/vxlan/vxlan_private.h | 2 +- drivers/net/vxlan/vxlan_vnifilter.c | 18 ++-- include/net/udp_tunnel.h | 87 ++++++++++++++----- net/core/dev.c | 4 +- net/ipv4/udp_tunnel_core.c | 16 ++-- net/ipv4/udp_tunnel_nic.c | 78 +++++++++++++---- .../drivers/net/netdevsim/udp_tunnel_nic.sh | 23 +---- 22 files changed, 176 insertions(+), 172 deletions(-)

-- 2.49.0

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Stanislav Fomichev

16 Jun 16 Jun

4:21 p.m.

New subject: [PATCH net-next v5 1/6] geneve: rely on rtnl lock in geneve_offload_rx_ports

udp_tunnel_push_rx_port will grab mutex in the next patch so we can't use rcu. geneve_offload_rx_ports is called from geneve_netdevice_event for NETDEV_UDP_TUNNEL_PUSH_INFO and NETDEV_UDP_TUNNEL_DROP_INFO which both have ASSERT_RTNL. Entries are added to and removed from the sock_list under rtnl lock as well (when adding or removing a tunneling device).

Signed-off-by: Stanislav Fomichev stfomichev@gmail.com --- drivers/net/geneve.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c index ffc15a432689..9efedc6758bf 100644 --- a/drivers/net/geneve.c +++ b/drivers/net/geneve.c @@ -41,6 +41,7 @@ MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); /* per-network namespace private data for this module */ struct geneve_net { struct list_head geneve_list; + /* sock_list is protected by rtnl lock */ struct list_head sock_list; };

@@ -1179,8 +1180,9 @@ static void geneve_offload_rx_ports(struct net_device *dev, bool push) struct geneve_net *gn = net_generic(net, geneve_net_id); struct geneve_sock *gs;

- rcu_read_lock(); - list_for_each_entry_rcu(gs, &gn->sock_list, list) { + ASSERT_RTNL(); + + list_for_each_entry(gs, &gn->sock_list, list) { if (push) { udp_tunnel_push_rx_port(dev, gs->sock, UDP_TUNNEL_TYPE_GENEVE); @@ -1189,7 +1191,6 @@ static void geneve_offload_rx_ports(struct net_device *dev, bool push) UDP_TUNNEL_TYPE_GENEVE); } } - rcu_read_unlock(); }

/* Initialize the device structure. */

-- 2.49.0

Nikolay Aleksandrov

18 Jun 18 Jun

3:14 p.m.

New subject: [PATCH net-next v5 1/6] geneve: rely on rtnl lock in geneve_offload_rx_ports

On 6/16/25 19:21, Stanislav Fomichev wrote:

...

udp_tunnel_push_rx_port will grab mutex in the next patch so we can't use rcu. geneve_offload_rx_ports is called from geneve_netdevice_event for NETDEV_UDP_TUNNEL_PUSH_INFO and NETDEV_UDP_TUNNEL_DROP_INFO which both have ASSERT_RTNL. Entries are added to and removed from the sock_list under rtnl lock as well (when adding or removing a tunneling device).

Signed-off-by: Stanislav Fomichev stfomichev@gmail.com

drivers/net/geneve.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c index ffc15a432689..9efedc6758bf 100644 --- a/drivers/net/geneve.c +++ b/drivers/net/geneve.c @@ -41,6 +41,7 @@ MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); /* per-network namespace private data for this module */ struct geneve_net { struct list_head geneve_list;

/* sock_list is protected by rtnl lock */ struct list_head sock_list;

}; @@ -1179,8 +1180,9 @@ static void geneve_offload_rx_ports(struct net_device *dev, bool push) struct geneve_net *gn = net_generic(net, geneve_net_id); struct geneve_sock *gs;

rcu_read_lock();

list_for_each_entry_rcu(gs, &gn->sock_list, list) {

ASSERT_RTNL();

list_for_each_entry(gs, &gn->sock_list, list) { if (push) { udp_tunnel_push_rx_port(dev, gs->sock, UDP_TUNNEL_TYPE_GENEVE);

@@ -1189,7 +1191,6 @@ static void geneve_offload_rx_ports(struct net_device *dev, bool push) UDP_TUNNEL_TYPE_GENEVE); } }

rcu_read_unlock();

} /* Initialize the device structure. */

Reviewed-by: Nikolay Aleksandrov razor@blackwall.org

Stanislav Fomichev

16 Jun 16 Jun

4:21 p.m.

New subject: [PATCH net-next v5 2/6] vxlan: drop sock_lock

We won't be able to sleep soon in vxlan_offload_rx_ports and won't be able to grab sock_lock. Instead of having separate spinlock to manage sockets, rely on rtnl lock. This is similar to how geneve manages its sockets.

Signed-off-by: Stanislav Fomichev stfomichev@gmail.com --- drivers/net/vxlan/vxlan_core.c | 35 ++++++++++++----------------- drivers/net/vxlan/vxlan_private.h | 2 +- drivers/net/vxlan/vxlan_vnifilter.c | 18 ++++++--------- 3 files changed, 22 insertions(+), 33 deletions(-)

diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c index 97792de896b7..9d7249caf137 100644 --- a/drivers/net/vxlan/vxlan_core.c +++ b/drivers/net/vxlan/vxlan_core.c @@ -1485,21 +1485,18 @@ static enum skb_drop_reason vxlan_snoop(struct net_device *dev,

static bool __vxlan_sock_release_prep(struct vxlan_sock *vs) { - struct vxlan_net *vn; + ASSERT_RTNL();

if (!vs) return false; if (!refcount_dec_and_test(&vs->refcnt)) return false;

- vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id); - spin_lock(&vn->sock_lock); hlist_del_rcu(&vs->hlist); udp_tunnel_notify_del_rx_port(vs->sock, (vs->flags & VXLAN_F_GPE) ? UDP_TUNNEL_TYPE_VXLAN_GPE : UDP_TUNNEL_TYPE_VXLAN); - spin_unlock(&vn->sock_lock);

return true; } @@ -2847,26 +2844,23 @@ static void vxlan_cleanup(struct timer_list *t)

static void vxlan_vs_del_dev(struct vxlan_dev *vxlan) { - struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); + ASSERT_RTNL();

- spin_lock(&vn->sock_lock); hlist_del_init_rcu(&vxlan->hlist4.hlist); #if IS_ENABLED(CONFIG_IPV6) hlist_del_init_rcu(&vxlan->hlist6.hlist); #endif - spin_unlock(&vn->sock_lock); }

static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan, struct vxlan_dev_node *node) { - struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); __be32 vni = vxlan->default_dst.remote_vni;

+ ASSERT_RTNL(); + node->vxlan = vxlan; - spin_lock(&vn->sock_lock); hlist_add_head_rcu(&node->hlist, vni_head(vs, vni)); - spin_unlock(&vn->sock_lock); }

/* Setup stats when device is created */ @@ -3291,9 +3285,10 @@ static void vxlan_offload_rx_ports(struct net_device *dev, bool push) struct vxlan_net *vn = net_generic(net, vxlan_net_id); unsigned int i;

- spin_lock(&vn->sock_lock); + ASSERT_RTNL(); + for (i = 0; i < PORT_HASH_SIZE; ++i) { - hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) { + hlist_for_each_entry(vs, &vn->sock_list[i], hlist) { unsigned short type;

if (vs->flags & VXLAN_F_GPE) @@ -3307,7 +3302,6 @@ static void vxlan_offload_rx_ports(struct net_device *dev, bool push) udp_tunnel_drop_rx_port(dev, vs->sock, type); } } - spin_unlock(&vn->sock_lock); }

/* Initialize the device structure. */ @@ -3537,12 +3531,13 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6, __be16 port, u32 flags, int ifindex) { - struct vxlan_net *vn = net_generic(net, vxlan_net_id); struct vxlan_sock *vs; struct socket *sock; unsigned int h; struct udp_tunnel_sock_cfg tunnel_cfg;

+ ASSERT_RTNL(); + vs = kzalloc(sizeof(*vs), GFP_KERNEL); if (!vs) return ERR_PTR(-ENOMEM); @@ -3560,13 +3555,11 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6, refcount_set(&vs->refcnt, 1); vs->flags = (flags & VXLAN_F_RCV_FLAGS);

- spin_lock(&vn->sock_lock); hlist_add_head_rcu(&vs->hlist, vs_head(net, port)); udp_tunnel_notify_add_rx_port(sock, (vs->flags & VXLAN_F_GPE) ? UDP_TUNNEL_TYPE_VXLAN_GPE : UDP_TUNNEL_TYPE_VXLAN); - spin_unlock(&vn->sock_lock);

/* Mark socket as an encapsulation socket. */ memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); @@ -3590,26 +3583,27 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,

static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6) { - struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; struct vxlan_sock *vs = NULL; struct vxlan_dev_node *node; int l3mdev_index = 0;

+ ASSERT_RTNL(); + if (vxlan->cfg.remote_ifindex) l3mdev_index = l3mdev_master_upper_ifindex_by_index( vxlan->net, vxlan->cfg.remote_ifindex);

if (!vxlan->cfg.no_share) { - spin_lock(&vn->sock_lock); + rcu_read_lock(); vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET, vxlan->cfg.dst_port, vxlan->cfg.flags, l3mdev_index); if (vs && !refcount_inc_not_zero(&vs->refcnt)) { - spin_unlock(&vn->sock_lock); + rcu_read_unlock(); return -EBUSY; } - spin_unlock(&vn->sock_lock); + rcu_read_unlock(); } if (!vs) vs = vxlan_socket_create(vxlan->net, ipv6, @@ -4875,7 +4869,6 @@ static __net_init int vxlan_init_net(struct net *net) unsigned int h;

INIT_LIST_HEAD(&vn->vxlan_list); - spin_lock_init(&vn->sock_lock); vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event;

for (h = 0; h < PORT_HASH_SIZE; ++h) diff --git a/drivers/net/vxlan/vxlan_private.h b/drivers/net/vxlan/vxlan_private.h index d328aed9feef..6c625fb29c6c 100644 --- a/drivers/net/vxlan/vxlan_private.h +++ b/drivers/net/vxlan/vxlan_private.h @@ -19,8 +19,8 @@ extern const struct rhashtable_params vxlan_vni_rht_params; /* per-network namespace private data for this module */ struct vxlan_net { struct list_head vxlan_list; + /* sock_list is protected by rtnl lock */ struct hlist_head sock_list[PORT_HASH_SIZE]; - spinlock_t sock_lock; struct notifier_block nexthop_notifier_block; };

diff --git a/drivers/net/vxlan/vxlan_vnifilter.c b/drivers/net/vxlan/vxlan_vnifilter.c index 186d0660669a..4ff56d9f8f28 100644 --- a/drivers/net/vxlan/vxlan_vnifilter.c +++ b/drivers/net/vxlan/vxlan_vnifilter.c @@ -40,11 +40,11 @@ static void vxlan_vs_add_del_vninode(struct vxlan_dev *vxlan, struct vxlan_vni_node *v, bool del) { - struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); struct vxlan_dev_node *node; struct vxlan_sock *vs;

- spin_lock(&vn->sock_lock); + ASSERT_RTNL(); + if (del) { if (!hlist_unhashed(&v->hlist4.hlist)) hlist_del_init_rcu(&v->hlist4.hlist); @@ -52,7 +52,7 @@ static void vxlan_vs_add_del_vninode(struct vxlan_dev *vxlan, if (!hlist_unhashed(&v->hlist6.hlist)) hlist_del_init_rcu(&v->hlist6.hlist); #endif - goto out; + return; }

#if IS_ENABLED(CONFIG_IPV6) @@ -67,23 +67,21 @@ static void vxlan_vs_add_del_vninode(struct vxlan_dev *vxlan, node = &v->hlist4; hlist_add_head_rcu(&node->hlist, vni_head(vs, v->vni)); } -out: - spin_unlock(&vn->sock_lock); }

void vxlan_vs_add_vnigrp(struct vxlan_dev *vxlan, struct vxlan_sock *vs, bool ipv6) { - struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); struct vxlan_vni_group *vg = rtnl_dereference(vxlan->vnigrp); struct vxlan_vni_node *v, *tmp; struct vxlan_dev_node *node;

+ ASSERT_RTNL(); + if (!vg) return;

- spin_lock(&vn->sock_lock); list_for_each_entry_safe(v, tmp, &vg->vni_list, vlist) { #if IS_ENABLED(CONFIG_IPV6) if (ipv6) @@ -94,26 +92,24 @@ void vxlan_vs_add_vnigrp(struct vxlan_dev *vxlan, node->vxlan = vxlan; hlist_add_head_rcu(&node->hlist, vni_head(vs, v->vni)); } - spin_unlock(&vn->sock_lock); }

void vxlan_vs_del_vnigrp(struct vxlan_dev *vxlan) { struct vxlan_vni_group *vg = rtnl_dereference(vxlan->vnigrp); - struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); struct vxlan_vni_node *v, *tmp;

+ ASSERT_RTNL(); + if (!vg) return;

- spin_lock(&vn->sock_lock); list_for_each_entry_safe(v, tmp, &vg->vni_list, vlist) { hlist_del_init_rcu(&v->hlist4.hlist); #if IS_ENABLED(CONFIG_IPV6) hlist_del_init_rcu(&v->hlist6.hlist); #endif } - spin_unlock(&vn->sock_lock); }

static void vxlan_vnifilter_stats_get(const struct vxlan_vni_node *vninode,

-- 2.49.0

Ido Schimmel

18 Jun 18 Jun

8:24 a.m.

New subject: [PATCH net-next v5 2/6] vxlan: drop sock_lock

On Mon, Jun 16, 2025 at 09:21:13AM -0700, Stanislav Fomichev wrote:

...

We won't be able to sleep soon in vxlan_offload_rx_ports and won't be able to grab sock_lock. Instead of having separate spinlock to manage sockets, rely on rtnl lock. This is similar to how geneve manages its sockets.

Signed-off-by: Stanislav Fomichev stfomichev@gmail.com

Reviewed-by: Ido Schimmel idosch@nvidia.com

Nikolay Aleksandrov

3:13 p.m.

New subject: [PATCH net-next v5 2/6] vxlan: drop sock_lock

On 6/16/25 19:21, Stanislav Fomichev wrote:

...

We won't be able to sleep soon in vxlan_offload_rx_ports and won't be able to grab sock_lock. Instead of having separate spinlock to manage sockets, rely on rtnl lock. This is similar to how geneve manages its sockets.

Signed-off-by: Stanislav Fomichev stfomichev@gmail.com

drivers/net/vxlan/vxlan_core.c | 35 ++++++++++++----------------- drivers/net/vxlan/vxlan_private.h | 2 +- drivers/net/vxlan/vxlan_vnifilter.c | 18 ++++++--------- 3 files changed, 22 insertions(+), 33 deletions(-)

Reviewed-by: Nikolay Aleksandrov razor@blackwall.org

Stanislav Fomichev

16 Jun 16 Jun

4:21 p.m.

New subject: [PATCH net-next v5 3/6] udp_tunnel: remove rtnl_lock dependency

Drivers that are using ops lock and don't depend on RTNL lock still need to manage it because udp_tunnel's RTNL dependency. Introduce new udp_tunnel_nic_lock and use it instead of rtnl_lock. Drop non-UDP_TUNNEL_NIC_INFO_MAY_SLEEP mode from udp_tunnel infra (udp_tunnel_nic_device_sync_work needs to grab udp_tunnel_nic_lock mutex and might sleep).

Cover more places in v4:

- netlink - udp_tunnel_notify_add_rx_port (ndo_open) - triggers udp_tunnel_nic_device_sync_work - udp_tunnel_notify_del_rx_port (ndo_stop) - triggers udp_tunnel_nic_device_sync_work - udp_tunnel_get_rx_info (__netdev_update_features) - triggers NETDEV_UDP_TUNNEL_PUSH_INFO - udp_tunnel_drop_rx_info (__netdev_update_features) - triggers NETDEV_UDP_TUNNEL_DROP_INFO - udp_tunnel_nic_reset_ntf (ndo_open)

- notifiers - udp_tunnel_nic_netdevice_event, depending on the event: - triggers NETDEV_UDP_TUNNEL_PUSH_INFO - triggers NETDEV_UDP_TUNNEL_DROP_INFO

- ethnl_tunnel_info_reply_size - udp_tunnel_nic_set_port_priv (two intel drivers)

Cc: Michael Chan michael.chan@broadcom.com Suggested-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Stanislav Fomichev stfomichev@gmail.com --- .../net/ethernet/broadcom/bnx2x/bnx2x_main.c | 3 +- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 6 +- drivers/net/ethernet/emulex/benet/be_main.c | 3 +- drivers/net/ethernet/intel/i40e/i40e_main.c | 1 - drivers/net/ethernet/intel/ice/ice_main.c | 1 - .../net/ethernet/mellanox/mlx4/en_netdev.c | 3 +- .../net/ethernet/mellanox/mlx5/core/en_main.c | 3 +- .../ethernet/netronome/nfp/nfp_net_common.c | 3 +- .../net/ethernet/qlogic/qede/qede_filter.c | 3 - .../net/ethernet/qlogic/qlcnic/qlcnic_main.c | 1 - drivers/net/ethernet/sfc/ef10.c | 1 - drivers/net/netdevsim/udp_tunnels.c | 4 - include/net/udp_tunnel.h | 87 ++++++++++++++----- net/core/dev.c | 2 + net/ipv4/udp_tunnel_core.c | 16 ++-- net/ipv4/udp_tunnel_nic.c | 78 +++++++++++++---- 16 files changed, 142 insertions(+), 73 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c index c9a1a1d504c0..3ee4b848ef53 100644 --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c @@ -10219,8 +10219,7 @@ static int bnx2x_udp_tunnel_sync(struct net_device *netdev, unsigned int table)

static const struct udp_tunnel_nic_info bnx2x_udp_tunnels = { .sync_table = bnx2x_udp_tunnel_sync, - .flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP | - UDP_TUNNEL_NIC_INFO_OPEN_ONLY, + .flags = UDP_TUNNEL_NIC_INFO_OPEN_ONLY, .tables = { { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, }, { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_GENEVE, }, diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index 869580b6f70d..7946586802af 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -15573,8 +15573,7 @@ static int bnxt_udp_tunnel_unset_port(struct net_device *netdev, unsigned int ta static const struct udp_tunnel_nic_info bnxt_udp_tunnels = { .set_port = bnxt_udp_tunnel_set_port, .unset_port = bnxt_udp_tunnel_unset_port, - .flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP | - UDP_TUNNEL_NIC_INFO_OPEN_ONLY, + .flags = UDP_TUNNEL_NIC_INFO_OPEN_ONLY, .tables = { { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, }, { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_GENEVE, }, @@ -15582,8 +15581,7 @@ static const struct udp_tunnel_nic_info bnxt_udp_tunnels = { }, bnxt_udp_tunnels_p7 = { .set_port = bnxt_udp_tunnel_set_port, .unset_port = bnxt_udp_tunnel_unset_port, - .flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP | - UDP_TUNNEL_NIC_INFO_OPEN_ONLY, + .flags = UDP_TUNNEL_NIC_INFO_OPEN_ONLY, .tables = { { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, }, { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_GENEVE, }, diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c index 3d2e21592119..f49400ba9729 100644 --- a/drivers/net/ethernet/emulex/benet/be_main.c +++ b/drivers/net/ethernet/emulex/benet/be_main.c @@ -4031,8 +4031,7 @@ static int be_vxlan_unset_port(struct net_device *netdev, unsigned int table, static const struct udp_tunnel_nic_info be_udp_tunnels = { .set_port = be_vxlan_set_port, .unset_port = be_vxlan_unset_port, - .flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP | - UDP_TUNNEL_NIC_INFO_OPEN_ONLY, + .flags = UDP_TUNNEL_NIC_INFO_OPEN_ONLY, .tables = { { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, }, }, diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 1156a5b3055c..3b4f59d978a5 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -15895,7 +15895,6 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)

pf->udp_tunnel_nic.set_port = i40e_udp_tunnel_set_port; pf->udp_tunnel_nic.unset_port = i40e_udp_tunnel_unset_port; - pf->udp_tunnel_nic.flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP; pf->udp_tunnel_nic.shared = &pf->udp_tunnel_shared; pf->udp_tunnel_nic.tables[0].n_entries = I40E_MAX_PF_UDP_OFFLOAD_PORTS; pf->udp_tunnel_nic.tables[0].tunnel_types = UDP_TUNNEL_TYPE_VXLAN | diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c index 7959a65c0903..f8ef80069e3d 100644 --- a/drivers/net/ethernet/intel/ice/ice_main.c +++ b/drivers/net/ethernet/intel/ice/ice_main.c @@ -4767,7 +4767,6 @@ int ice_init_dev(struct ice_pf *pf)

pf->hw.udp_tunnel_nic.set_port = ice_udp_tunnel_set_port; pf->hw.udp_tunnel_nic.unset_port = ice_udp_tunnel_unset_port; - pf->hw.udp_tunnel_nic.flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP; pf->hw.udp_tunnel_nic.shared = &pf->hw.udp_tunnel_shared; if (pf->hw.tnl.valid_count[TNL_VXLAN]) { pf->hw.udp_tunnel_nic.tables[0].n_entries = diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c index 281b34af0bb4..d2071aff7b8f 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c @@ -2670,8 +2670,7 @@ static int mlx4_udp_tunnel_sync(struct net_device *dev, unsigned int table)

static const struct udp_tunnel_nic_info mlx4_udp_tunnels = { .sync_table = mlx4_udp_tunnel_sync, - .flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP | - UDP_TUNNEL_NIC_INFO_IPV4_ONLY, + .flags = UDP_TUNNEL_NIC_INFO_IPV4_ONLY, .tables = { { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, }, }, diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c index ea822c69d137..ccde53f94045 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c @@ -5303,8 +5303,7 @@ void mlx5e_vxlan_set_netdev_info(struct mlx5e_priv *priv)

priv->nic_info.set_port = mlx5e_vxlan_set_port; priv->nic_info.unset_port = mlx5e_vxlan_unset_port; - priv->nic_info.flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP | - UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN; + priv->nic_info.flags = UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN; priv->nic_info.tables[0].tunnel_types = UDP_TUNNEL_TYPE_VXLAN; /* Don't count the space hard-coded to the IANA port */ priv->nic_info.tables[0].n_entries = diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c index 932f59d70f41..132626a3f9f7 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c @@ -2394,8 +2394,7 @@ static int nfp_udp_tunnel_sync(struct net_device *netdev, unsigned int table)

static const struct udp_tunnel_nic_info nfp_udp_tunnels = { .sync_table = nfp_udp_tunnel_sync, - .flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP | - UDP_TUNNEL_NIC_INFO_OPEN_ONLY, + .flags = UDP_TUNNEL_NIC_INFO_OPEN_ONLY, .tables = { { .n_entries = NFP_NET_N_VXLAN_PORTS, diff --git a/drivers/net/ethernet/qlogic/qede/qede_filter.c b/drivers/net/ethernet/qlogic/qede/qede_filter.c index 985026dd816f..7e341e026489 100644 --- a/drivers/net/ethernet/qlogic/qede/qede_filter.c +++ b/drivers/net/ethernet/qlogic/qede/qede_filter.c @@ -987,20 +987,17 @@ static int qede_udp_tunnel_sync(struct net_device *dev, unsigned int table)

static const struct udp_tunnel_nic_info qede_udp_tunnels_both = { .sync_table = qede_udp_tunnel_sync, - .flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP, .tables = { { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, }, { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_GENEVE, }, }, }, qede_udp_tunnels_vxlan = { .sync_table = qede_udp_tunnel_sync, - .flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP, .tables = { { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, }, }, }, qede_udp_tunnels_geneve = { .sync_table = qede_udp_tunnel_sync, - .flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP, .tables = { { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_GENEVE, }, }, diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c index eb69121df726..53cdd36c4123 100644 --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c @@ -486,7 +486,6 @@ static int qlcnic_udp_tunnel_sync(struct net_device *dev, unsigned int table)

static const struct udp_tunnel_nic_info qlcnic_udp_tunnels = { .sync_table = qlcnic_udp_tunnel_sync, - .flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP, .tables = { { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, }, }, diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c index 47349c148c0c..fcec81f862ec 100644 --- a/drivers/net/ethernet/sfc/ef10.c +++ b/drivers/net/ethernet/sfc/ef10.c @@ -3985,7 +3985,6 @@ static int efx_ef10_udp_tnl_unset_port(struct net_device *dev, static const struct udp_tunnel_nic_info efx_ef10_udp_tunnels = { .set_port = efx_ef10_udp_tnl_set_port, .unset_port = efx_ef10_udp_tnl_unset_port, - .flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP, .tables = { { .n_entries = 16, diff --git a/drivers/net/netdevsim/udp_tunnels.c b/drivers/net/netdevsim/udp_tunnels.c index 640b4983a9a0..10cbbf1c584b 100644 --- a/drivers/net/netdevsim/udp_tunnels.c +++ b/drivers/net/netdevsim/udp_tunnels.c @@ -112,12 +112,10 @@ nsim_udp_tunnels_info_reset_write(struct file *file, const char __user *data, struct net_device *dev = file->private_data; struct netdevsim *ns = netdev_priv(dev);

- rtnl_lock(); if (dev->reg_state == NETREG_REGISTERED) { memset(ns->udp_ports.ports, 0, sizeof(ns->udp_ports.__ports)); udp_tunnel_nic_reset_ntf(dev); } - rtnl_unlock();

return count; } @@ -181,8 +179,6 @@ int nsim_udp_tunnels_info_create(struct nsim_dev *nsim_dev, info->sync_table = NULL; }

- if (ns->udp_ports.sleep) - info->flags |= UDP_TUNNEL_NIC_INFO_MAY_SLEEP; if (nsim_dev->udp_ports.open_only) info->flags |= UDP_TUNNEL_NIC_INFO_OPEN_ONLY; if (nsim_dev->udp_ports.ipv4_only) diff --git a/include/net/udp_tunnel.h b/include/net/udp_tunnel.h index 2df3b8344eb5..0106e2dc2af1 100644 --- a/include/net/udp_tunnel.h +++ b/include/net/udp_tunnel.h @@ -130,22 +130,6 @@ void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock, void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type); void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type);

-static inline void udp_tunnel_get_rx_info(struct net_device *dev) -{ - ASSERT_RTNL(); - if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT)) - return; - call_netdevice_notifiers(NETDEV_UDP_TUNNEL_PUSH_INFO, dev); -} - -static inline void udp_tunnel_drop_rx_info(struct net_device *dev) -{ - ASSERT_RTNL(); - if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT)) - return; - call_netdevice_notifiers(NETDEV_UDP_TUNNEL_DROP_INFO, dev); -} - /* Transmit the skb using UDP encapsulation. */ void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb, __be32 src, __be32 dst, __u8 tos, __u8 ttl, @@ -221,19 +205,17 @@ static inline void udp_tunnel_encap_enable(struct sock *sk) #define UDP_TUNNEL_NIC_MAX_TABLES 4

enum udp_tunnel_nic_info_flags { - /* Device callbacks may sleep */ - UDP_TUNNEL_NIC_INFO_MAY_SLEEP = BIT(0), /* Device only supports offloads when it's open, all ports * will be removed before close and re-added after open. */ - UDP_TUNNEL_NIC_INFO_OPEN_ONLY = BIT(1), + UDP_TUNNEL_NIC_INFO_OPEN_ONLY = BIT(0), /* Device supports only IPv4 tunnels */ - UDP_TUNNEL_NIC_INFO_IPV4_ONLY = BIT(2), + UDP_TUNNEL_NIC_INFO_IPV4_ONLY = BIT(1), /* Device has hard-coded the IANA VXLAN port (4789) as VXLAN. * This port must not be counted towards n_entries of any table. * Driver will not receive any callback associated with port 4789. */ - UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN = BIT(3), + UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN = BIT(2), };

struct udp_tunnel_nic; @@ -324,6 +306,9 @@ struct udp_tunnel_nic_ops { size_t (*dump_size)(struct net_device *dev, unsigned int table); int (*dump_write)(struct net_device *dev, unsigned int table, struct sk_buff *skb); + void (*assert_locked)(struct net_device *dev); + void (*lock)(struct net_device *dev); + void (*unlock)(struct net_device *dev); };

#ifdef CONFIG_INET @@ -352,8 +337,29 @@ static inline void udp_tunnel_nic_set_port_priv(struct net_device *dev, unsigned int table, unsigned int idx, u8 priv) { - if (udp_tunnel_nic_ops) + if (udp_tunnel_nic_ops) { + udp_tunnel_nic_ops->lock(dev); udp_tunnel_nic_ops->set_port_priv(dev, table, idx, priv); + udp_tunnel_nic_ops->unlock(dev); + } +} + +static inline void udp_tunnel_nic_assert_locked(struct net_device *dev) +{ + if (udp_tunnel_nic_ops) + udp_tunnel_nic_ops->assert_locked(dev); +} + +static inline void udp_tunnel_nic_lock(struct net_device *dev) +{ + if (udp_tunnel_nic_ops) + udp_tunnel_nic_ops->lock(dev); +} + +static inline void udp_tunnel_nic_unlock(struct net_device *dev) +{ + if (udp_tunnel_nic_ops) + udp_tunnel_nic_ops->unlock(dev); }

static inline void @@ -395,17 +401,50 @@ static inline void udp_tunnel_nic_reset_ntf(struct net_device *dev) static inline size_t udp_tunnel_nic_dump_size(struct net_device *dev, unsigned int table) { + size_t ret; + if (!udp_tunnel_nic_ops) return 0; - return udp_tunnel_nic_ops->dump_size(dev, table); + + udp_tunnel_nic_ops->lock(dev); + ret = udp_tunnel_nic_ops->dump_size(dev, table); + udp_tunnel_nic_ops->unlock(dev); + + return ret; }

static inline int udp_tunnel_nic_dump_write(struct net_device *dev, unsigned int table, struct sk_buff *skb) { + int ret; + if (!udp_tunnel_nic_ops) return 0; - return udp_tunnel_nic_ops->dump_write(dev, table, skb); + + udp_tunnel_nic_ops->lock(dev); + ret = udp_tunnel_nic_ops->dump_write(dev, table, skb); + udp_tunnel_nic_ops->unlock(dev); + + return ret; +} + +static inline void udp_tunnel_get_rx_info(struct net_device *dev) +{ + ASSERT_RTNL(); + if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT)) + return; + udp_tunnel_nic_assert_locked(dev); + call_netdevice_notifiers(NETDEV_UDP_TUNNEL_PUSH_INFO, dev); } + +static inline void udp_tunnel_drop_rx_info(struct net_device *dev) +{ + ASSERT_RTNL(); + if (!(dev->features & NETIF_F_RX_UDP_TUNNEL_PORT)) + return; + udp_tunnel_nic_assert_locked(dev); + call_netdevice_notifiers(NETDEV_UDP_TUNNEL_DROP_INFO, dev); +} + #endif diff --git a/net/core/dev.c b/net/core/dev.c index 5baa4691074f..43f56b44f351 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -10771,12 +10771,14 @@ int __netdev_update_features(struct net_device *dev) * *before* calling udp_tunnel_get_rx_info, * but *after* calling udp_tunnel_drop_rx_info. */ + udp_tunnel_nic_lock(dev); if (features & NETIF_F_RX_UDP_TUNNEL_PORT) { dev->features = features; udp_tunnel_get_rx_info(dev); } else { udp_tunnel_drop_rx_info(dev); } + udp_tunnel_nic_unlock(dev); }

if (diff & NETIF_F_HW_VLAN_CTAG_FILTER) { diff --git a/net/ipv4/udp_tunnel_core.c b/net/ipv4/udp_tunnel_core.c index 2326548997d3..433283dd0e70 100644 --- a/net/ipv4/udp_tunnel_core.c +++ b/net/ipv4/udp_tunnel_core.c @@ -134,15 +134,17 @@ void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type) struct udp_tunnel_info ti; struct net_device *dev;

+ ASSERT_RTNL(); + ti.type = type; ti.sa_family = sk->sk_family; ti.port = inet_sk(sk)->inet_sport;

- rcu_read_lock(); - for_each_netdev_rcu(net, dev) { + for_each_netdev(net, dev) { + udp_tunnel_nic_lock(dev); udp_tunnel_nic_add_port(dev, &ti); + udp_tunnel_nic_unlock(dev); } - rcu_read_unlock(); } EXPORT_SYMBOL_GPL(udp_tunnel_notify_add_rx_port);

@@ -154,15 +156,17 @@ void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type) struct udp_tunnel_info ti; struct net_device *dev;

+ ASSERT_RTNL(); + ti.type = type; ti.sa_family = sk->sk_family; ti.port = inet_sk(sk)->inet_sport;

- rcu_read_lock(); - for_each_netdev_rcu(net, dev) { + for_each_netdev(net, dev) { + udp_tunnel_nic_lock(dev); udp_tunnel_nic_del_port(dev, &ti); + udp_tunnel_nic_unlock(dev); } - rcu_read_unlock(); } EXPORT_SYMBOL_GPL(udp_tunnel_notify_del_rx_port);

diff --git a/net/ipv4/udp_tunnel_nic.c b/net/ipv4/udp_tunnel_nic.c index b6d2d16189c0..ff66db48453c 100644 --- a/net/ipv4/udp_tunnel_nic.c +++ b/net/ipv4/udp_tunnel_nic.c @@ -29,6 +29,7 @@ struct udp_tunnel_nic_table_entry { * struct udp_tunnel_nic - UDP tunnel port offload state * @work: async work for talking to hardware from process context * @dev: netdev pointer + * @lock: protects all fields * @need_sync: at least one port start changed * @need_replay: space was freed, we need a replay of all ports * @work_pending: @work is currently scheduled @@ -41,6 +42,8 @@ struct udp_tunnel_nic {

struct net_device *dev;

+ struct mutex lock; + u8 need_sync:1; u8 need_replay:1; u8 work_pending:1; @@ -298,22 +301,11 @@ __udp_tunnel_nic_device_sync(struct net_device *dev, struct udp_tunnel_nic *utn) static void udp_tunnel_nic_device_sync(struct net_device *dev, struct udp_tunnel_nic *utn) { - const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; - bool may_sleep; - if (!utn->need_sync) return;

- /* Drivers which sleep in the callback need to update from - * the workqueue, if we come from the tunnel driver's notification. - */ - may_sleep = info->flags & UDP_TUNNEL_NIC_INFO_MAY_SLEEP; - if (!may_sleep) - __udp_tunnel_nic_device_sync(dev, utn); - if (may_sleep || utn->need_replay) { - queue_work(udp_tunnel_nic_workqueue, &utn->work); - utn->work_pending = 1; - } + queue_work(udp_tunnel_nic_workqueue, &utn->work); + utn->work_pending = 1; }

static bool @@ -554,12 +546,12 @@ static void __udp_tunnel_nic_reset_ntf(struct net_device *dev) struct udp_tunnel_nic *utn; unsigned int i, j;

- ASSERT_RTNL(); - utn = dev->udp_tunnel_nic; if (!utn) return;

+ mutex_lock(&utn->lock); + utn->need_sync = false; for (i = 0; i < utn->n_tables; i++) for (j = 0; j < info->tables[i].n_entries; j++) { @@ -569,7 +561,7 @@ static void __udp_tunnel_nic_reset_ntf(struct net_device *dev)

entry->flags &= ~(UDP_TUNNEL_NIC_ENTRY_DEL | UDP_TUNNEL_NIC_ENTRY_OP_FAIL); - /* We don't release rtnl across ops */ + /* We don't release utn lock across ops */ WARN_ON(entry->flags & UDP_TUNNEL_NIC_ENTRY_FROZEN); if (!entry->use_cnt) continue; @@ -579,6 +571,8 @@ static void __udp_tunnel_nic_reset_ntf(struct net_device *dev) }

__udp_tunnel_nic_device_sync(dev, utn); + + mutex_unlock(&utn->lock); }

static size_t @@ -643,6 +637,33 @@ __udp_tunnel_nic_dump_write(struct net_device *dev, unsigned int table, return -EMSGSIZE; }

+static void __udp_tunnel_nic_assert_locked(struct net_device *dev) +{ + struct udp_tunnel_nic *utn; + + utn = dev->udp_tunnel_nic; + if (utn) + lockdep_assert_held(&utn->lock); +} + +static void __udp_tunnel_nic_lock(struct net_device *dev) +{ + struct udp_tunnel_nic *utn; + + utn = dev->udp_tunnel_nic; + if (utn) + mutex_lock(&utn->lock); +} + +static void __udp_tunnel_nic_unlock(struct net_device *dev) +{ + struct udp_tunnel_nic *utn; + + utn = dev->udp_tunnel_nic; + if (utn) + mutex_unlock(&utn->lock); +} + static const struct udp_tunnel_nic_ops __udp_tunnel_nic_ops = { .get_port = __udp_tunnel_nic_get_port, .set_port_priv = __udp_tunnel_nic_set_port_priv, @@ -651,6 +672,9 @@ static const struct udp_tunnel_nic_ops __udp_tunnel_nic_ops = { .reset_ntf = __udp_tunnel_nic_reset_ntf, .dump_size = __udp_tunnel_nic_dump_size, .dump_write = __udp_tunnel_nic_dump_write, + .assert_locked = __udp_tunnel_nic_assert_locked, + .lock = __udp_tunnel_nic_lock, + .unlock = __udp_tunnel_nic_unlock, };

static void @@ -710,11 +734,15 @@ static void udp_tunnel_nic_device_sync_work(struct work_struct *work) container_of(work, struct udp_tunnel_nic, work);

rtnl_lock(); + mutex_lock(&utn->lock); + utn->work_pending = 0; __udp_tunnel_nic_device_sync(utn->dev, utn);

if (utn->need_replay) udp_tunnel_nic_replay(utn->dev, utn); + + mutex_unlock(&utn->lock); rtnl_unlock(); }

@@ -730,6 +758,7 @@ udp_tunnel_nic_alloc(const struct udp_tunnel_nic_info *info, return NULL; utn->n_tables = n_tables; INIT_WORK(&utn->work, udp_tunnel_nic_device_sync_work); + mutex_init(&utn->lock);

for (i = 0; i < n_tables; i++) { utn->entries[i] = kcalloc(info->tables[i].n_entries, @@ -821,8 +850,11 @@ static int udp_tunnel_nic_register(struct net_device *dev) dev_hold(dev); dev->udp_tunnel_nic = utn;

- if (!(info->flags & UDP_TUNNEL_NIC_INFO_OPEN_ONLY)) + if (!(info->flags & UDP_TUNNEL_NIC_INFO_OPEN_ONLY)) { + udp_tunnel_nic_lock(dev); udp_tunnel_get_rx_info(dev); + udp_tunnel_nic_unlock(dev); + }

return 0; } @@ -832,6 +864,8 @@ udp_tunnel_nic_unregister(struct net_device *dev, struct udp_tunnel_nic *utn) { const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info;

+ udp_tunnel_nic_lock(dev); + /* For a shared table remove this dev from the list of sharing devices * and if there are other devices just detach. */ @@ -841,8 +875,10 @@ udp_tunnel_nic_unregister(struct net_device *dev, struct udp_tunnel_nic *utn) list_for_each_entry(node, &info->shared->devices, list) if (node->dev == dev) break; - if (list_entry_is_head(node, &info->shared->devices, list)) + if (list_entry_is_head(node, &info->shared->devices, list)) { + udp_tunnel_nic_unlock(dev); return; + }

list_del(&node->list); kfree(node); @@ -852,6 +888,7 @@ udp_tunnel_nic_unregister(struct net_device *dev, struct udp_tunnel_nic *utn) if (first) { udp_tunnel_drop_rx_info(dev); utn->dev = first->dev; + udp_tunnel_nic_unlock(dev); goto release_dev; }

@@ -862,6 +899,7 @@ udp_tunnel_nic_unregister(struct net_device *dev, struct udp_tunnel_nic *utn) * from the work which we will boot immediately. */ udp_tunnel_nic_flush(dev, utn); + udp_tunnel_nic_unlock(dev);

/* Wait for the work to be done using the state, netdev core will * retry unregister until we give up our reference on this device. @@ -910,12 +948,16 @@ udp_tunnel_nic_netdevice_event(struct notifier_block *unused, return NOTIFY_DONE;

if (event == NETDEV_UP) { + udp_tunnel_nic_lock(dev); WARN_ON(!udp_tunnel_nic_is_empty(dev, utn)); udp_tunnel_get_rx_info(dev); + udp_tunnel_nic_unlock(dev); return NOTIFY_OK; } if (event == NETDEV_GOING_DOWN) { + udp_tunnel_nic_lock(dev); udp_tunnel_nic_flush(dev, utn); + udp_tunnel_nic_unlock(dev); return NOTIFY_OK; }

-- 2.49.0

Stanislav Fomichev

4:21 p.m.

New subject: [PATCH net-next v5 4/6] net: remove redundant ASSERT_RTNL() in queue setup functions

The existing netdev_ops_assert_locked() already asserts that either the RTNL lock or the per-device lock is held, making the explicit ASSERT_RTNL() redundant.

Cc: Michael Chan michael.chan@broadcom.com Signed-off-by: Stanislav Fomichev stfomichev@gmail.com --- net/core/dev.c | 2 -- 1 file changed, 2 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c index 43f56b44f351..df1678b1fe24 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -3179,7 +3179,6 @@ int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)

if (dev->reg_state == NETREG_REGISTERED || dev->reg_state == NETREG_UNREGISTERING) { - ASSERT_RTNL(); netdev_ops_assert_locked(dev);

rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, @@ -3229,7 +3228,6 @@ int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) return -EINVAL;

if (dev->reg_state == NETREG_REGISTERED) { - ASSERT_RTNL(); netdev_ops_assert_locked(dev);

rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,

-- 2.49.0

Stanislav Fomichev

4:21 p.m.

New subject: [PATCH net-next v5 5/6] netdevsim: remove udp_ports_sleep

Now that there is only one path in udp_tunnel, there is no need to have udp_ports_sleep knob. Remove it and adjust the test.

Cc: Michael Chan michael.chan@broadcom.com Reviewed-by: Aleksandr Loktionov aleksandr.loktionov@intel.com Signed-off-by: Stanislav Fomichev stfomichev@gmail.com --- drivers/net/netdevsim/netdevsim.h | 2 -- drivers/net/netdevsim/udp_tunnels.c | 8 ------- .../drivers/net/netdevsim/udp_tunnel_nic.sh | 23 +------------------ 3 files changed, 1 insertion(+), 32 deletions(-)

diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h index d04401f0bdf7..511ed72a93ce 100644 --- a/drivers/net/netdevsim/netdevsim.h +++ b/drivers/net/netdevsim/netdevsim.h @@ -131,7 +131,6 @@ struct netdevsim { struct nsim_macsec macsec; struct { u32 inject_error; - u32 sleep; u32 __ports[2][NSIM_UDP_TUNNEL_N_PORTS]; u32 (*ports)[NSIM_UDP_TUNNEL_N_PORTS]; struct dentry *ddir; @@ -342,7 +341,6 @@ struct nsim_dev { bool ipv4_only; bool shared; bool static_iana_vxlan; - u32 sleep; } udp_ports; struct nsim_dev_psample *psample; u16 esw_mode; diff --git a/drivers/net/netdevsim/udp_tunnels.c b/drivers/net/netdevsim/udp_tunnels.c index 10cbbf1c584b..89fff76e51cf 100644 --- a/drivers/net/netdevsim/udp_tunnels.c +++ b/drivers/net/netdevsim/udp_tunnels.c @@ -18,9 +18,6 @@ nsim_udp_tunnel_set_port(struct net_device *dev, unsigned int table, ret = -ns->udp_ports.inject_error; ns->udp_ports.inject_error = 0;

- if (ns->udp_ports.sleep) - msleep(ns->udp_ports.sleep); - if (!ret) { if (ns->udp_ports.ports[table][entry]) { WARN(1, "entry already in use\n"); @@ -47,8 +44,6 @@ nsim_udp_tunnel_unset_port(struct net_device *dev, unsigned int table, ret = -ns->udp_ports.inject_error; ns->udp_ports.inject_error = 0;

- if (ns->udp_ports.sleep) - msleep(ns->udp_ports.sleep); if (!ret) { u32 val = be16_to_cpu(ti->port) << 16 | ti->type;

@@ -170,7 +165,6 @@ int nsim_udp_tunnels_info_create(struct nsim_dev *nsim_dev, GFP_KERNEL); if (!info) return -ENOMEM; - ns->udp_ports.sleep = nsim_dev->udp_ports.sleep;

if (nsim_dev->udp_ports.sync_all) { info->set_port = NULL; @@ -213,6 +207,4 @@ void nsim_udp_tunnels_debugfs_create(struct nsim_dev *nsim_dev) &nsim_dev->udp_ports.shared); debugfs_create_bool("udp_ports_static_iana_vxlan", 0600, nsim_dev->ddir, &nsim_dev->udp_ports.static_iana_vxlan); - debugfs_create_u32("udp_ports_sleep", 0600, nsim_dev->ddir, - &nsim_dev->udp_ports.sleep); } diff --git a/tools/testing/selftests/drivers/net/netdevsim/udp_tunnel_nic.sh b/tools/testing/selftests/drivers/net/netdevsim/udp_tunnel_nic.sh index 92c2f0376c08..4c859ecdad94 100755 --- a/tools/testing/selftests/drivers/net/netdevsim/udp_tunnel_nic.sh +++ b/tools/testing/selftests/drivers/net/netdevsim/udp_tunnel_nic.sh @@ -266,7 +266,6 @@ for port in 0 1; do echo $NSIM_ID > /sys/bus/netdevsim/new_device else echo 1 > $NSIM_DEV_DFS/udp_ports_open_only - echo 1 > $NSIM_DEV_DFS/udp_ports_sleep echo 1 > $NSIM_DEV_SYS/new_port fi NSIM_NETDEV=`get_netdev_name old_netdevs` @@ -350,23 +349,11 @@ old_netdevs=$(ls /sys/class/net) port=0 echo $NSIM_ID > /sys/bus/netdevsim/new_device echo 0 > $NSIM_DEV_SYS/del_port -echo 1000 > $NSIM_DEV_DFS/udp_ports_sleep echo 0 > $NSIM_DEV_SYS/new_port NSIM_NETDEV=`get_netdev_name old_netdevs`

msg="create VxLANs" -exp0=( 0 0 0 0 ) # sleep is longer than out wait -new_vxlan vxlan0 10000 $NSIM_NETDEV - -modprobe -r vxlan -modprobe -r udp_tunnel - -msg="remove tunnels" -exp0=( 0 0 0 0 ) -check_tables - -msg="create VxLANs" -exp0=( 0 0 0 0 ) # sleep is longer than out wait +exp0=( `mke 10000 1` 0 0 0 ) new_vxlan vxlan0 10000 $NSIM_NETDEV

exp0=( 0 0 0 0 ) @@ -428,7 +415,6 @@ echo 0 > $NSIM_DEV_SYS/del_port for port in 0 1; do if [ $port -ne 0 ]; then echo 1 > $NSIM_DEV_DFS/udp_ports_open_only - echo 1 > $NSIM_DEV_DFS/udp_ports_sleep fi

echo $port > $NSIM_DEV_SYS/new_port @@ -486,7 +472,6 @@ echo 1 > $NSIM_DEV_DFS/udp_ports_sync_all for port in 0 1; do if [ $port -ne 0 ]; then echo 1 > $NSIM_DEV_DFS/udp_ports_open_only - echo 1 > $NSIM_DEV_DFS/udp_ports_sleep fi

echo $port > $NSIM_DEV_SYS/new_port @@ -543,7 +528,6 @@ echo 0 > $NSIM_DEV_SYS/del_port for port in 0 1; do if [ $port -ne 0 ]; then echo 1 > $NSIM_DEV_DFS/udp_ports_open_only - echo 1 > $NSIM_DEV_DFS/udp_ports_sleep fi

echo $port > $NSIM_DEV_SYS/new_port @@ -573,7 +557,6 @@ echo 1 > $NSIM_DEV_DFS/udp_ports_ipv4_only for port in 0 1; do if [ $port -ne 0 ]; then echo 1 > $NSIM_DEV_DFS/udp_ports_open_only - echo 1 > $NSIM_DEV_DFS/udp_ports_sleep fi

echo $port > $NSIM_DEV_SYS/new_port @@ -634,7 +617,6 @@ echo 0 > $NSIM_DEV_SYS/del_port for port in 0 1; do if [ $port -ne 0 ]; then echo 1 > $NSIM_DEV_DFS/udp_ports_open_only - echo 1 > $NSIM_DEV_DFS/udp_ports_sleep fi

echo $port > $NSIM_DEV_SYS/new_port @@ -690,7 +672,6 @@ echo 0 > $NSIM_DEV_SYS/del_port for port in 0 1; do if [ $port -ne 0 ]; then echo 1 > $NSIM_DEV_DFS/udp_ports_open_only - echo 1 > $NSIM_DEV_DFS/udp_ports_sleep fi

echo $port > $NSIM_DEV_SYS/new_port @@ -750,7 +731,6 @@ echo 0 > $NSIM_DEV_SYS/del_port for port in 0 1; do if [ $port -ne 0 ]; then echo 1 > $NSIM_DEV_DFS/udp_ports_open_only - echo 1 > $NSIM_DEV_DFS/udp_ports_sleep fi

echo $port > $NSIM_DEV_SYS/new_port @@ -809,7 +789,6 @@ echo $NSIM_ID > /sys/bus/netdevsim/new_device echo 0 > $NSIM_DEV_SYS/del_port

echo 0 > $NSIM_DEV_DFS/udp_ports_open_only -echo 1 > $NSIM_DEV_DFS/udp_ports_sleep echo 1 > $NSIM_DEV_DFS/udp_ports_shared

old_netdevs=$(ls /sys/class/net)

-- 2.49.0

Stanislav Fomichev

4:21 p.m.

New subject: [PATCH net-next v5 6/6] Revert "bnxt_en: bring back rtnl_lock() in the bnxt_open() path"

This reverts commit 325eb217e41fa14f307c7cc702bd18d0bb38fe84.

udp_tunnel infra doesn't need RTNL, should be safe to get back to only netdev instance lock.

Cc: Michael Chan michael.chan@broadcom.com Reviewed-by: Aleksandr Loktionov aleksandr.loktionov@intel.com Signed-off-by: Stanislav Fomichev stfomichev@gmail.com --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 36 +++++------------------ 1 file changed, 7 insertions(+), 29 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index 7946586802af..b359ef4b78a9 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -14055,28 +14055,13 @@ static void bnxt_unlock_sp(struct bnxt *bp) netdev_unlock(bp->dev); }

-/* Same as bnxt_lock_sp() with additional rtnl_lock */ -static void bnxt_rtnl_lock_sp(struct bnxt *bp) -{ - clear_bit(BNXT_STATE_IN_SP_TASK, &bp->state); - rtnl_lock(); - netdev_lock(bp->dev); -} - -static void bnxt_rtnl_unlock_sp(struct bnxt *bp) -{ - set_bit(BNXT_STATE_IN_SP_TASK, &bp->state); - netdev_unlock(bp->dev); - rtnl_unlock(); -} - /* Only called from bnxt_sp_task() */ static void bnxt_reset(struct bnxt *bp, bool silent) { - bnxt_rtnl_lock_sp(bp); + bnxt_lock_sp(bp); if (test_bit(BNXT_STATE_OPEN, &bp->state)) bnxt_reset_task(bp, silent); - bnxt_rtnl_unlock_sp(bp); + bnxt_unlock_sp(bp); }

/* Only called from bnxt_sp_task() */ @@ -14084,9 +14069,9 @@ static void bnxt_rx_ring_reset(struct bnxt *bp) { int i;

- bnxt_rtnl_lock_sp(bp); + bnxt_lock_sp(bp); if (!test_bit(BNXT_STATE_OPEN, &bp->state)) { - bnxt_rtnl_unlock_sp(bp); + bnxt_unlock_sp(bp); return; } /* Disable and flush TPA before resetting the RX ring */ @@ -14125,7 +14110,7 @@ static void bnxt_rx_ring_reset(struct bnxt *bp) } if (bp->flags & BNXT_FLAG_TPA) bnxt_set_tpa(bp, true); - bnxt_rtnl_unlock_sp(bp); + bnxt_unlock_sp(bp); }

static void bnxt_fw_fatal_close(struct bnxt *bp) @@ -15017,17 +15002,15 @@ static void bnxt_fw_reset_task(struct work_struct *work) bp->fw_reset_state = BNXT_FW_RESET_STATE_OPENING; fallthrough; case BNXT_FW_RESET_STATE_OPENING: - while (!rtnl_trylock()) { + while (!netdev_trylock(bp->dev)) { bnxt_queue_fw_reset_work(bp, HZ / 10); return; } - netdev_lock(bp->dev); rc = bnxt_open(bp->dev); if (rc) { netdev_err(bp->dev, "bnxt_open() failed during FW reset\n"); bnxt_fw_reset_abort(bp, rc); netdev_unlock(bp->dev); - rtnl_unlock(); goto ulp_start; }

@@ -15047,7 +15030,6 @@ static void bnxt_fw_reset_task(struct work_struct *work) bnxt_dl_health_fw_status_update(bp, true); } netdev_unlock(bp->dev); - rtnl_unlock(); bnxt_ulp_start(bp, 0); bnxt_reenable_sriov(bp); netdev_lock(bp->dev); @@ -15996,7 +15978,7 @@ static int bnxt_queue_start(struct net_device *dev, void *qmem, int idx) rc); napi_enable_locked(&bnapi->napi); bnxt_db_nq_arm(bp, &cpr->cp_db, cpr->cp_raw_cons); - netif_close(dev); + bnxt_reset_task(bp, true); return rc; }

@@ -16812,7 +16794,6 @@ static int bnxt_resume(struct device *device) struct bnxt *bp = netdev_priv(dev); int rc = 0;

- rtnl_lock(); netdev_lock(dev); rc = pci_enable_device(bp->pdev); if (rc) { @@ -16857,7 +16838,6 @@ static int bnxt_resume(struct device *device)

resume_exit: netdev_unlock(bp->dev); - rtnl_unlock(); bnxt_ulp_start(bp, rc); if (!rc) bnxt_reenable_sriov(bp); @@ -17023,7 +17003,6 @@ static void bnxt_io_resume(struct pci_dev *pdev) int err;

netdev_info(bp->dev, "PCI Slot Resume\n"); - rtnl_lock(); netdev_lock(netdev);

err = bnxt_hwrm_func_qcaps(bp); @@ -17041,7 +17020,6 @@ static void bnxt_io_resume(struct pci_dev *pdev) netif_device_attach(netdev);

netdev_unlock(netdev); - rtnl_unlock(); bnxt_ulp_start(bp, err); if (!err) bnxt_reenable_sriov(bp);

-- 2.49.0

patchwork-bot+netdevbpf＠kernel.org

19 Jun 19 Jun

2 a.m.

Hello:

This series was applied to netdev/net-next.git (main) by Jakub Kicinski kuba@kernel.org:

On Mon, 16 Jun 2025 09:21:11 -0700 you wrote:

...

Recently bnxt had to grow back a bunch of rtnl dependencies because of udp_tunnel's infra. Add separate (global) mutext to protect udp_tunnel state.

v5:

remove unused variable (lkp@intel.com)

[...]

Here is the summary with links: - [net-next,v5,1/6] geneve: rely on rtnl lock in geneve_offload_rx_ports https://git.kernel.org/netdev/net-next/c/3e14960f3bd2 - [net-next,v5,2/6] vxlan: drop sock_lock https://git.kernel.org/netdev/net-next/c/df5425b3bd85 - [net-next,v5,3/6] udp_tunnel: remove rtnl_lock dependency https://git.kernel.org/netdev/net-next/c/1ead7501094c - [net-next,v5,4/6] net: remove redundant ASSERT_RTNL() in queue setup functions https://git.kernel.org/netdev/net-next/c/3a321b6b1f76 - [net-next,v5,5/6] netdevsim: remove udp_ports_sleep https://git.kernel.org/netdev/net-next/c/e054c8ba3bce - [net-next,v5,6/6] Revert "bnxt_en: bring back rtnl_lock() in the bnxt_open() path" https://git.kernel.org/netdev/net-next/c/850d9248d2ea

You are awesome, thank you!

-- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html

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Ido Schimmel
Nikolay Aleksandrov
patchwork-bot+netdevbpf＠kernel.org
Stanislav Fomichev