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linux/net/ipv4
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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
..
netfilter netfilter: nf_dup4: Convert nf_dup_ipv4_route() to dscp_t. 2024-11-15 11:00:29 +01:00
Kconfig net/tcp: Expand goo.gl link 2024-07-30 18:35:12 -07:00
Makefile bpfilter: remove bpfilter 2024-01-04 10:23:10 -08:00
af_inet.c ipv4: Define inet_sk_init_flowi4() and use it in inet_sk_rebuild_header(). 2024-12-20 13:50:09 -08:00
ah4.c net: fill in MODULE_DESCRIPTION()s for ipv4 modules 2024-02-09 14:12:02 -08:00
arp.c neighbour: Remove bare neighbour::next pointer 2024-11-09 13:22:57 -08:00
bpf_tcp_ca.c bpf: Check unsupported ops from the bpf_struct_ops's cfi_stubs 2024-07-29 12:54:13 -07:00
cipso_ipv4.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
datagram.c ipv4: Use inet_sk_init_flowi4() in ip4_datagram_release_cb(). 2024-12-20 13:50:09 -08:00
devinet.c net: convert to nla_get_*_default() 2024-11-11 10:32:06 -08:00
esp4.c ipsec-2025-01-27 2025-01-27 15:15:12 -08:00
esp4_offload.c xfrm: Add an inbound percpu state cache. 2024-10-29 11:56:18 +01:00
fib_frontend.c net: ip: fix unexpected return in fib_validate_source() 2024-11-18 18:57:00 -08:00
fib_lookup.h
…
fib_notifier.c net: do not acquire rtnl in fib_seq_sum() 2024-10-11 15:35:05 -07:00
fib_rules.c ipv4: fib_rules: Reject flow label attributes 2024-12-19 16:02:21 +01:00
fib_semantics.c ipv4: remove fib_info_devhash[] 2024-10-07 16:46:27 -07:00
fib_trie.c ipv4: output metric as unsigned int 2024-12-15 13:13:40 -08:00
fou_bpf.c ip_tunnel: convert __be16 tunnel flags to bitmaps 2024-04-01 10:49:28 +01:00
fou_core.c fou: fix initialization of grc 2024-09-09 17:21:47 -07:00
fou_nl.c tools: ynl-gen: use big-endian netlink attribute types 2024-10-22 15:33:24 +02:00
fou_nl.h net: ynl: prefix uAPI header include with uapi/ 2023-05-26 10:30:14 +01:00
gre_demux.c ip_tunnel: convert __be16 tunnel flags to bitmaps 2024-04-01 10:49:28 +01:00
gre_offload.c net: gro: rename skb_gro_header_hard() 2024-03-05 13:30:11 +01:00
icmp.c inetpeer: do not get a refcount in inet_getpeer() 2024-12-17 19:37:48 -08:00
igmp.c netlink: correct nlmsg size for multicast notifications 2024-12-23 10:26:43 -08:00
inet_connection_sock.c ipv4: Use inet_sk_init_flowi4() in inet_csk_rebuild_route(). 2024-12-20 13:50:09 -08:00
inet_diag.c tcp: annotate data-races around icsk->icsk_pending 2024-10-04 15:34:39 -07:00
inet_fragment.c net: Rename mono_delivery_time to tstamp_type for scalabilty 2024-05-23 14:14:23 -07:00
inet_hashtables.c inet: constify 'struct net' parameter of various lookup helpers 2024-08-05 16:22:45 -07:00
inet_timewait_sock.c tcp: move inet_twsk_schedule helper out of header 2024-06-10 11:54:18 +01:00
inetpeer.c inetpeer: avoid false sharing in inet_peer_xrlim_allow() 2024-12-20 13:04:40 -08:00
ip_forward.c net: fix IPSTATS_MIB_OUTFORWDATAGRAMS increment after fragment check 2023-10-13 09:58:45 -07:00
ip_fragment.c inetpeer: do not get a refcount in inet_getpeer() 2024-12-17 19:37:48 -08:00
ip_gre.c gre: Prepare ipgre_open() to .flowi4_tos conversion. 2025-01-16 16:51:57 -08:00
ip_input.c ipv4: remove useless arg 2025-01-02 17:17:40 -08:00
ip_options.c net: ip: make ip_route_input() return drop reasons 2024-11-12 11:24:51 +01:00
ip_output.c ipv4: Use inet_sk_init_flowi4() in __ip_queue_xmit(). 2024-12-20 13:50:09 -08:00
ip_sockglue.c Networking changes for 6.14. 2025-01-22 08:28:57 -08:00
ip_tunnel.c net: Fix netns for ip_tunnel_init_flow() 2024-12-23 10:04:41 -08:00
ip_tunnel_core.c ip_tunnel: convert __be16 tunnel flags to bitmaps 2024-04-01 10:49:28 +01:00
ip_vti.c netdev_features: convert NETIF_F_LLTX to dev->lltx 2024-09-03 11:36:43 +02:00
ipcomp.c
…
ipconfig.c net: ipconfig: move ic_nameservers_fallback into #ifdef block 2023-05-22 11:17:55 +01:00
ipip.c netdev_features: convert NETIF_F_LLTX to dev->lltx 2024-09-03 11:36:43 +02:00
ipmr.c inet: ipmr: fix data-races 2025-01-15 15:07:23 -08:00
ipmr_base.c ipmr: do not call mr_mfc_uses_dev() for unres entries 2025-01-23 07:08:13 -08:00
metrics.c net: remove NULL-pointer net parameter in ip_metrics_convert 2024-06-05 10:06:00 +01:00
netfilter.c netfilter: ipv4: Convert ip_route_me_harder() to dscp_t. 2024-11-15 11:00:29 +01:00
netlink.c
…
nexthop.c net: convert to nla_get_*_default() 2024-11-11 10:32:06 -08:00
ping.c ping: use sk_skb_reason_drop to free rx packets 2024-06-19 12:44:22 +01:00
proc.c tcp: add LINUX_MIB_PAWS_OLD_ACK SNMP counter 2025-01-14 13:28:13 -08:00
protocol.c
…
raw.c sock: support SO_PRIORITY cmsg 2024-12-16 18:13:44 -08:00
raw_diag.c inet_diag: add module pointer to "struct inet_diag_handler" 2024-01-23 15:13:54 +01:00
route.c ipv4: Prepare inet_rtm_getroute() to .flowi4_tos conversion. 2025-01-16 16:52:29 -08:00
syncookies.c tcp: use sk_skb_reason_drop to free rx packets 2024-06-19 12:44:22 +01:00
sysctl_net_ipv4.c tcp: Add sysctl to configure TIME-WAIT reuse delay 2024-12-11 20:17:33 -08:00
tcp.c tcp: only release congestion control if it has been initialized 2024-10-31 18:22:48 -07:00
tcp_ao.c net/tcp: Add missing lockdep annotations for TCP-AO hlist traversals 2024-11-03 12:10:11 -08:00
tcp_bbr.c tcp: Add new args for cong_control in tcp_congestion_ops 2024-05-02 16:26:56 -07:00
tcp_bic.c
…
tcp_bpf.c tcp_bpf: Fix copied value in tcp_bpf_sendmsg 2024-12-20 22:53:36 +01:00
tcp_cdg.c
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tcp_cong.c tcp: only release congestion control if it has been initialized 2024-10-31 18:22:48 -07:00
tcp_cubic.c tcp_cubic: fix incorrect HyStart round start detection 2025-01-20 12:26:41 +00:00
tcp_dctcp.c tcp: Fix shift-out-of-bounds in dctcp_update_alpha(). 2024-05-21 13:34:50 +02:00
tcp_dctcp.h
…
tcp_diag.c inet_diag: add module pointer to "struct inet_diag_handler" 2024-01-23 15:13:54 +01:00
tcp_fastopen.c net: use unrcu_pointer() helper 2024-06-06 11:52:52 +02:00
tcp_highspeed.c
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tcp_htcp.c tcp: Use clamp() in htcp_alpha_update() 2024-08-06 12:16:25 -07:00
tcp_hybla.c
…
tcp_illinois.c
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tcp_input.c tcp: add LINUX_MIB_PAWS_OLD_ACK SNMP counter 2025-01-14 13:28:13 -08:00
tcp_ipv4.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-01-09 16:11:47 -08:00
tcp_lp.c tcp: rename tcp_time_stamp() to tcp_time_stamp_ts() 2023-10-23 09:35:01 +01:00
tcp_metrics.c tcp_metrics: use netlink policy for IPv6 addr len validation 2024-08-19 17:42:57 -07:00
tcp_minisocks.c tcp: Measure TIME-WAIT reuse delay with millisecond precision 2024-12-11 20:17:33 -08:00
tcp_nv.c
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tcp_offload.c net: gso: fix tcp fraglist segmentation after pull from frag_list 2024-10-02 17:21:47 -07:00
tcp_output.c tcp: correct handling of extreme memory squeeze 2025-01-29 18:58:15 -08:00
tcp_plb.c
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tcp_rate.c
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tcp_recovery.c tcp: fix excessive TLP and RACK timeouts from HZ rounding 2023-10-17 17:25:42 -07:00
tcp_scalable.c
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tcp_sigpool.c net/tcp_sigpool: Use nested-BH locking for sigpool_scratch. 2024-06-24 16:41:22 -07:00
tcp_timer.c net: tcp: refresh tcp_mstamp for compressed ack in timer 2024-10-07 16:01:39 -07:00
tcp_ulp.c net/ulp: use consistent error code when blocking ULP 2023-01-19 09:26:16 -08:00
tcp_vegas.c
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tcp_vegas.h
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tcp_veno.c
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tcp_westwood.c
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tcp_yeah.c
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tunnel4.c net: fill in MODULE_DESCRIPTION()s for ipv4 modules 2024-02-09 14:12:02 -08:00
udp.c udp: gso: do not drop small packets when PMTU reduces 2025-02-03 10:13:27 +00:00
udp_bpf.c bpf, sockmap: Fix an infinite loop error when len is 0 in tcp_bpf_recvmsg_parser() 2023-03-03 17:25:15 +01:00
udp_diag.c inet_diag: add module pointer to "struct inet_diag_handler" 2024-01-23 15:13:54 +01:00
udp_impl.h sock: Remove ->sendpage*() in favour of sendmsg(MSG_SPLICE_PAGES) 2023-06-24 15:50:13 -07:00
udp_offload.c gso: fix udp gso fraglist segmentation after pull from frag_list 2024-10-02 17:29:31 -07:00
udp_tunnel_core.c ipv4: udp_tunnel: Unmask upper DSCP bits in udp_tunnel_dst_lookup() 2024-09-09 14:14:53 +01:00
udp_tunnel_nic.c udp_tunnel: Use flex array to simplify code 2023-10-03 11:39:34 +02:00
udp_tunnel_stub.c
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udplite.c udplite: remove UDPLITE_BIT 2023-09-14 16:16:36 +02:00
xfrm4_input.c ipv4: Convert ip_route_input_noref() to dscp_t. 2024-10-03 16:21:21 -07:00
xfrm4_output.c
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xfrm4_policy.c xfrm: Convert struct xfrm_dst_lookup_params -> tos to dscp_t. 2024-11-06 12:42:51 +01:00
xfrm4_protocol.c ipv4: Convert ip_route_input_noref() to dscp_t. 2024-10-03 16:21:21 -07:00
xfrm4_state.c
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xfrm4_tunnel.c net: fill in MODULE_DESCRIPTION()s for ipv4 modules 2024-02-09 14:12:02 -08:00