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Yan Zhai 235174b2be udp: gso: do not drop small packets when PMTU reduces 
Commit 4094871db1 ("udp: only do GSO if # of segs > 1") avoided GSO
for small packets. But the kernel currently dismisses GSO requests only
after checking MTU/PMTU on gso_size. This means any packets, regardless
of their payload sizes, could be dropped when PMTU becomes smaller than
requested gso_size. We encountered this issue in production and it
caused a reliability problem that new QUIC connection cannot be
established before PMTU cache expired, while non GSO sockets still
worked fine at the same time.

Ideally, do not check any GSO related constraints when payload size is
smaller than requested gso_size, and return EMSGSIZE instead of EINVAL
on MTU/PMTU check failure to be more specific on the error cause.

Fixes: 4094871db1 ("udp: only do GSO if # of segs > 1")
Signed-off-by: Yan Zhai <yan@cloudflare.com>
Suggested-by: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2025-02-03 10:13:27 +00:00
..
6lowpan ipv6: eliminate ndisc_ops_is_useropt() 2024-08-12 17:23:57 -07:00
9p net/9p/usbg: allow building as standalone module 2024-11-22 23:48:14 +09:00
802 net: 802: LLC+SNAP OID:PID lookup on start of skb data 2025-01-04 08:06:24 -08:00
8021q net: convert to nla_get_*_default() 2024-11-11 10:32:06 -08:00
appletalk net: appletalk: Drop aarp_send_probe_phase1() 2025-01-20 10:08:19 +00:00
atm atm: clean up a put_user() calls 2024-06-14 19:08:50 -07:00
ax25 ax25: rcu protect dev->ax25_ptr 2025-01-06 15:57:01 -08:00
batman-adv This cleanup patchset includes the following patches: 2025-01-18 17:57:31 -08:00
bluetooth First batch of fixes for 6.14. Nothing really stands out, 2025-01-30 12:24:20 -08:00
bpf bpf-next-6.14 2025-01-23 08:04:07 -08:00
bridge netfilter: br_netfilter: remove unused conditional and dead code 2025-01-19 16:41:52 +01:00
caif caif: Remove unused cfsrvl_getphyid 2024-10-08 15:33:49 -07:00
can sock: support SO_PRIORITY cmsg 2024-12-16 18:13:44 -08:00
ceph ceph: allocate sparse_ext map only for sparse reads 2024-12-16 23:25:44 +01:00
core First batch of fixes for 6.14. Nothing really stands out, 2025-01-30 12:24:20 -08:00
dcb dcb: Use rtnl_register_many(). 2024-10-15 18:52:26 -07:00
dccp sysctl net: Remove macro checks for CONFIG_SYSCTL 2025-01-20 12:01:34 -08:00
devlink devlink: Improve the port attributes description 2025-01-02 17:10:57 -08:00
dns_resolver
dsa Driver core and debugfs updates 2025-01-28 12:25:12 -08:00
ethernet netkit: Fix pkt_type override upon netkit pass verdict 2024-05-25 10:48:57 -07:00
ethtool ethtool: Fix set RXNFC command with symmetric RSS hash 2025-01-28 12:25:42 +01:00
handshake module: Convert symbol namespace to string literal 2024-12-02 11:34:44 -08:00
hsr First batch of fixes for 6.14. Nothing really stands out, 2025-01-30 12:24:20 -08:00
ieee802154 net: convert to nla_get_*_default() 2024-11-11 10:32:06 -08:00
ife
ipv4 udp: gso: do not drop small packets when PMTU reduces 2025-02-03 10:13:27 +00:00
ipv6 udp: gso: do not drop small packets when PMTU reduces 2025-02-03 10:13:27 +00:00
iucv s390/iucv: MSG_PEEK causes memory leak in iucv_sock_destruct() 2024-11-26 10:02:53 +01:00
kcm kcm: replace call_rcu by kfree_rcu for simple kmem_cache_free callback 2024-10-15 10:50:21 -07:00
key xfrm: Add support for per cpu xfrm state handling. 2024-10-29 11:56:00 +01:00
l2tp l2tp: Use inet_sk_init_flowi4() in l2tp_ip_sendmsg(). 2024-12-20 13:50:09 -08:00
l3mdev
lapb
llc sysctl net: Remove macro checks for CONFIG_SYSCTL 2025-01-20 12:01:34 -08:00
mac80211 Driver core and debugfs updates 2025-01-28 12:25:12 -08:00
mac802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-01-09 16:11:47 -08:00
mctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-12-19 11:35:07 -08:00
mpls rtnetlink: Return int from rtnl_af_register(). 2024-10-22 11:02:05 +02:00
mptcp mptcp: blackhole only if 1st SYN retrans w/o MPC is accepted 2025-01-30 14:02:19 +01:00
ncsi net/ncsi: use dev_set_mac_address() for Get MC MAC Address handling 2025-01-27 09:20:07 +00:00
netfilter First batch of fixes for 6.14. Nothing really stands out, 2025-01-30 12:24:20 -08:00
netlabel net: corrections for security_secid_to_secctx returns 2025-01-04 22:11:22 -05:00
netlink net: netlink: catch attempts to send empty messages 2024-12-19 18:06:28 -08:00
netrom netrom: check buffer length before accessing it 2024-12-23 10:04:55 -08:00
nfc NFC: nci: Add bounds checking in nci_hci_create_pipe() 2025-01-22 19:39:27 -08:00
nsh nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment(). 2024-04-26 12:20:01 +02:00
openvswitch openvswitch: fix lockup on tx to unregistering netdev with carrier 2025-01-10 18:20:49 -08:00
packet Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-01-03 16:29:29 -08:00
phonet phonet: do not call synchronize_rcu() from phonet_route_del() 2024-11-07 20:34:16 -08:00
psample psample: adjust size if rate_as_probability is set 2024-12-18 19:23:04 -08:00
qrtr net: qrtr: Update packets cloning when broadcasting 2024-09-24 10:48:16 +02:00
rds rds: sysctl: rds_tcp_{rcv,snd}buf: avoid using current->nsproxy 2025-01-09 08:53:35 -08:00
rfkill Get rid of 'remove_new' relic from platform driver struct 2024-12-01 15:12:43 -08:00
rose net: rose: fix timer races against user threads 2025-01-27 14:09:42 -08:00
rxrpc rxrpc, afs: Fix peer hash locking vs RCU callback 2025-01-27 14:46:18 -08:00
sched net: sched: fix ets qdisc OOB Indexing 2025-01-22 19:35:43 -08:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-01-09 16:11:47 -08:00
shaper net: add netdev_lock() / netdev_unlock() helpers 2025-01-15 19:13:33 -08:00
smc net/smc: fix data error when recvmsg with MSG_PEEK flag 2025-01-13 18:59:00 -08:00
strparser
sunrpc NFS Client Updates for Linux 6.14 2025-01-28 14:23:46 -08:00
switchdev net: bridge: switchdev: Improve error message for port_obj_add/del functions 2024-05-08 12:19:12 +01:00
tipc tipc: re-order conditions in tipc_crypto_key_rcv() 2025-01-20 12:18:26 +00:00
tls tls: skip setting sk_write_space on rekey 2025-01-10 18:34:45 -08:00
unix af_unix: Use consume_skb() in connect() and sendmsg(). 2025-01-20 11:27:42 -08:00
vmw_vsock First batch of fixes for 6.14. Nothing really stands out, 2025-01-30 12:24:20 -08:00
wireless Driver core and debugfs updates 2025-01-28 12:25:12 -08:00
x25 net: change proto and proto_ops accept type 2024-05-13 18:19:09 -06:00
xdp xsk: Bring back busy polling support 2025-01-10 18:07:56 -08:00
xfrm ipsec-2025-01-27 2025-01-27 15:15:12 -08:00
compat.c
devres.c
Kconfig netlink: spec: add shaper YAML spec 2024-10-10 08:30:21 -07:00
Kconfig.debug rtnetlink: Add per-netns RTNL. 2024-10-08 15:16:59 +02:00
Makefile netlink: spec: add shaper YAML spec 2024-10-10 08:30:21 -07:00
socket.c socket: Remove unused kernel_sendmsg_locked 2025-01-14 17:29:04 -08:00
sysctl_net.c sysctl: Remove check for sentinel element in ctl_table arrays 2024-06-13 10:50:52 +02:00