This is a note to let you know that I've just added the patch titled
nfp: flower: fix for take a mutex lock in soft irq context and rcu lock
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfp-flower-fix-for-take-a-mutex-lock-in-soft-irq-context-and-rcu-lock.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0ad722bd9ee3a9bdfca9613148645e4c9b7f26cf Mon Sep 17 00:00:00 2001
From: Hui Zhou <hui.zhou@xxxxxxxxxxxx>
Date: Tue, 5 Dec 2023 11:26:25 +0200
Subject: nfp: flower: fix for take a mutex lock in soft irq context and rcu lock
From: Hui Zhou <hui.zhou@xxxxxxxxxxxx>
commit 0ad722bd9ee3a9bdfca9613148645e4c9b7f26cf upstream.
The neighbour event callback call the function nfp_tun_write_neigh,
this function will take a mutex lock and it is in soft irq context,
change the work queue to process the neighbour event.
Move the nfp_tun_write_neigh function out of range rcu_read_lock/unlock()
in function nfp_tunnel_request_route_v4 and nfp_tunnel_request_route_v6.
Fixes: abc210952af7 ("nfp: flower: tunnel neigh support bond offload")
CC: stable@xxxxxxxxxxxxxxx # 6.2+
Signed-off-by: Hui Zhou <hui.zhou@xxxxxxxxxxxx>
Signed-off-by: Louis Peens <louis.peens@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
.../netronome/nfp/flower/tunnel_conf.c | 127 +++++++++++++-----
1 file changed, 95 insertions(+), 32 deletions(-)
diff --git a/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c b/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c
index 060a77f2265d..e522845c7c21 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c
@@ -160,6 +160,18 @@ struct nfp_tun_mac_addr_offload {
u8 addr[ETH_ALEN];
};
+/**
+ * struct nfp_neigh_update_work - update neighbour information to nfp
+ * @work: Work queue for writing neigh to the nfp
+ * @n: neighbour entry
+ * @app: Back pointer to app
+ */
+struct nfp_neigh_update_work {
+ struct work_struct work;
+ struct neighbour *n;
+ struct nfp_app *app;
+};
+
enum nfp_flower_mac_offload_cmd {
NFP_TUNNEL_MAC_OFFLOAD_ADD = 0,
NFP_TUNNEL_MAC_OFFLOAD_DEL = 1,
@@ -607,38 +619,30 @@ nfp_tun_write_neigh(struct net_device *netdev, struct nfp_app *app,
nfp_flower_cmsg_warn(app, "Neighbour configuration failed.\n");
}
-static int
-nfp_tun_neigh_event_handler(struct notifier_block *nb, unsigned long event,
- void *ptr)
+static void
+nfp_tun_release_neigh_update_work(struct nfp_neigh_update_work *update_work)
{
- struct nfp_flower_priv *app_priv;
- struct netevent_redirect *redir;
- struct neighbour *n;
+ neigh_release(update_work->n);
+ kfree(update_work);
+}
+
+static void nfp_tun_neigh_update(struct work_struct *work)
+{
+ struct nfp_neigh_update_work *update_work;
struct nfp_app *app;
+ struct neighbour *n;
bool neigh_invalid;
int err;
- switch (event) {
- case NETEVENT_REDIRECT:
- redir = (struct netevent_redirect *)ptr;
- n = redir->neigh;
- break;
- case NETEVENT_NEIGH_UPDATE:
- n = (struct neighbour *)ptr;
- break;
- default:
- return NOTIFY_DONE;
- }
-
- neigh_invalid = !(n->nud_state & NUD_VALID) || n->dead;
-
- app_priv = container_of(nb, struct nfp_flower_priv, tun.neigh_nb);
- app = app_priv->app;
+ update_work = container_of(work, struct nfp_neigh_update_work, work);
+ app = update_work->app;
+ n = update_work->n;
if (!nfp_flower_get_port_id_from_netdev(app, n->dev))
- return NOTIFY_DONE;
+ goto out;
#if IS_ENABLED(CONFIG_INET)
+ neigh_invalid = !(n->nud_state & NUD_VALID) || n->dead;
if (n->tbl->family == AF_INET6) {
#if IS_ENABLED(CONFIG_IPV6)
struct flowi6 flow6 = {};
@@ -655,13 +659,11 @@ nfp_tun_neigh_event_handler(struct notifier_block *nb, unsigned long event,
dst = ip6_dst_lookup_flow(dev_net(n->dev), NULL,
&flow6, NULL);
if (IS_ERR(dst))
- return NOTIFY_DONE;
+ goto out;
dst_release(dst);
}
nfp_tun_write_neigh(n->dev, app, &flow6, n, true, false);
-#else
- return NOTIFY_DONE;
#endif /* CONFIG_IPV6 */
} else {
struct flowi4 flow4 = {};
@@ -678,17 +680,71 @@ nfp_tun_neigh_event_handler(struct notifier_block *nb, unsigned long event,
rt = ip_route_output_key(dev_net(n->dev), &flow4);
err = PTR_ERR_OR_ZERO(rt);
if (err)
- return NOTIFY_DONE;
+ goto out;
ip_rt_put(rt);
}
nfp_tun_write_neigh(n->dev, app, &flow4, n, false, false);
}
-#else
- return NOTIFY_DONE;
#endif /* CONFIG_INET */
+out:
+ nfp_tun_release_neigh_update_work(update_work);
+}
- return NOTIFY_OK;
+static struct nfp_neigh_update_work *
+nfp_tun_alloc_neigh_update_work(struct nfp_app *app, struct neighbour *n)
+{
+ struct nfp_neigh_update_work *update_work;
+
+ update_work = kzalloc(sizeof(*update_work), GFP_ATOMIC);
+ if (!update_work)
+ return NULL;
+
+ INIT_WORK(&update_work->work, nfp_tun_neigh_update);
+ neigh_hold(n);
+ update_work->n = n;
+ update_work->app = app;
+
+ return update_work;
+}
+
+static int
+nfp_tun_neigh_event_handler(struct notifier_block *nb, unsigned long event,
+ void *ptr)
+{
+ struct nfp_neigh_update_work *update_work;
+ struct nfp_flower_priv *app_priv;
+ struct netevent_redirect *redir;
+ struct neighbour *n;
+ struct nfp_app *app;
+
+ switch (event) {
+ case NETEVENT_REDIRECT:
+ redir = (struct netevent_redirect *)ptr;
+ n = redir->neigh;
+ break;
+ case NETEVENT_NEIGH_UPDATE:
+ n = (struct neighbour *)ptr;
+ break;
+ default:
+ return NOTIFY_DONE;
+ }
+#if IS_ENABLED(CONFIG_IPV6)
+ if (n->tbl != ipv6_stub->nd_tbl && n->tbl != &arp_tbl)
+#else
+ if (n->tbl != &arp_tbl)
+#endif
+ return NOTIFY_DONE;
+
+ app_priv = container_of(nb, struct nfp_flower_priv, tun.neigh_nb);
+ app = app_priv->app;
+ update_work = nfp_tun_alloc_neigh_update_work(app, n);
+ if (!update_work)
+ return NOTIFY_DONE;
+
+ queue_work(system_highpri_wq, &update_work->work);
+
+ return NOTIFY_DONE;
}
void nfp_tunnel_request_route_v4(struct nfp_app *app, struct sk_buff *skb)
@@ -706,6 +762,7 @@ void nfp_tunnel_request_route_v4(struct nfp_app *app, struct sk_buff *skb)
netdev = nfp_app_dev_get(app, be32_to_cpu(payload->ingress_port), NULL);
if (!netdev)
goto fail_rcu_unlock;
+ dev_hold(netdev);
flow.daddr = payload->ipv4_addr;
flow.flowi4_proto = IPPROTO_UDP;
@@ -725,13 +782,16 @@ void nfp_tunnel_request_route_v4(struct nfp_app *app, struct sk_buff *skb)
ip_rt_put(rt);
if (!n)
goto fail_rcu_unlock;
+ rcu_read_unlock();
+
nfp_tun_write_neigh(n->dev, app, &flow, n, false, true);
neigh_release(n);
- rcu_read_unlock();
+ dev_put(netdev);
return;
fail_rcu_unlock:
rcu_read_unlock();
+ dev_put(netdev);
nfp_flower_cmsg_warn(app, "Requested route not found.\n");
}
@@ -749,6 +809,7 @@ void nfp_tunnel_request_route_v6(struct nfp_app *app, struct sk_buff *skb)
netdev = nfp_app_dev_get(app, be32_to_cpu(payload->ingress_port), NULL);
if (!netdev)
goto fail_rcu_unlock;
+ dev_hold(netdev);
flow.daddr = payload->ipv6_addr;
flow.flowi6_proto = IPPROTO_UDP;
@@ -766,14 +827,16 @@ void nfp_tunnel_request_route_v6(struct nfp_app *app, struct sk_buff *skb)
dst_release(dst);
if (!n)
goto fail_rcu_unlock;
+ rcu_read_unlock();
nfp_tun_write_neigh(n->dev, app, &flow, n, true, true);
neigh_release(n);
- rcu_read_unlock();
+ dev_put(netdev);
return;
fail_rcu_unlock:
rcu_read_unlock();
+ dev_put(netdev);
nfp_flower_cmsg_warn(app, "Requested IPv6 route not found.\n");
}
--
2.43.0
Patches currently in stable-queue which might be from hui.zhou@xxxxxxxxxxxx are
queue-6.6/nfp-flower-fix-for-take-a-mutex-lock-in-soft-irq-context-and-rcu-lock.patch
