Since commit a4dfa72d0acd ("tipc: set default MTU for UDP media"), it's
been no longer using dev->mtu for b->mtu, and the issue described in
commit 3de81b758853 ("tipc: check minimum bearer MTU") doesn't exist
in UDP bearer any more.
Besides, dev->mtu can still be changed to a too small mtu after the UDP
bearer is created even with tipc_mtu_bad() check in tipc_udp_enable().
Note that NETDEV_CHANGEMTU event processing in tipc_l2_device_event()
doesn't really work for UDP bearer.
So this patch deletes the unnecessary tipc_mtu_bad from tipc_udp_enable.
Signed-off-by: Xin Long <lucien....@gmail.com>
---
net/tipc/bearer.c | 4 ++--
net/tipc/bearer.h | 4 ++--
net/tipc/udp_media.c | 4 ----
3 files changed, 4 insertions(+), 8 deletions(-)
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 53881406e200..114140c49108 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -431,7 +431,7 @@ int tipc_enable_l2_media(struct net *net, struct
tipc_bearer *b,
dev = dev_get_by_name(net, dev_name);
if (!dev)
return -ENODEV;
- if (tipc_mtu_bad(dev, 0)) {
+ if (tipc_mtu_bad(dev)) {
dev_put(dev);
return -EINVAL;
}
@@ -708,7 +708,7 @@ static int tipc_l2_device_event(struct notifier_block *nb,
unsigned long evt,
test_and_set_bit_lock(0, &b->up);
break;
case NETDEV_CHANGEMTU:
- if (tipc_mtu_bad(dev, 0)) {
+ if (tipc_mtu_bad(dev)) {
bearer_disable(net, b);
break;
}
diff --git a/net/tipc/bearer.h b/net/tipc/bearer.h
index bd0cc5c287ef..1ee60649bd17 100644
--- a/net/tipc/bearer.h
+++ b/net/tipc/bearer.h
@@ -257,9 +257,9 @@ static inline void tipc_loopback_trace(struct net *net,
}
/* check if device MTU is too low for tipc headers */
-static inline bool tipc_mtu_bad(struct net_device *dev, unsigned int reserve)
+static inline bool tipc_mtu_bad(struct net_device *dev)
{
- if (dev->mtu >= TIPC_MIN_BEARER_MTU + reserve)
+ if (dev->mtu >= TIPC_MIN_BEARER_MTU)
return false;
netdev_warn(dev, "MTU too low for tipc bearer\n");
return true;
diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c
index 0a85244fd618..926232557e77 100644
--- a/net/tipc/udp_media.c
+++ b/net/tipc/udp_media.c
@@ -739,10 +739,6 @@ static int tipc_udp_enable(struct net *net, struct
tipc_bearer *b,
udp_conf.use_udp_checksums = false;
ub->ifindex = dev->ifindex;
b->encap_hlen = sizeof(struct iphdr) + sizeof(struct udphdr);
- if (tipc_mtu_bad(dev, b->encap_hlen)) {
- err = -EINVAL;
- goto err;
- }
b->mtu = b->media->mtu;
#if IS_ENABLED(CONFIG_IPV6)
} else if (local.proto == htons(ETH_P_IPV6)) {
--
2.39.1
_______________________________________________
tipc-discussion mailing list
tipc-discussion@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/tipc-discussion
