linux_dsm_epyc7002/net
Eric Dumazet 24adbc1676 tcp: fix SO_RCVLOWAT hangs with fat skbs
We autotune rcvbuf whenever SO_RCVLOWAT is set to account for 100%
overhead in tcp_set_rcvlowat()

This works well when skb->len/skb->truesize ratio is bigger than 0.5

But if we receive packets with small MSS, we can end up in a situation
where not enough bytes are available in the receive queue to satisfy
RCVLOWAT setting.
As our sk_rcvbuf limit is hit, we send zero windows in ACK packets,
preventing remote peer from sending more data.

Even autotuning does not help, because it only triggers at the time
user process drains the queue. If no EPOLLIN is generated, this
can not happen.

Note poll() has a similar issue, after commit
c7004482e8 ("tcp: Respect SO_RCVLOWAT in tcp_poll().")

Fixes: 03f45c883c ("tcp: avoid extra wakeups for SO_RCVLOWAT users")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-12 12:49:47 -07:00
..
6lowpan
9p 9pnet: allow making incomplete read requests 2020-03-27 09:29:56 +00:00
802 net: 802: psnap.c: Use built-in RCU list checking 2020-02-24 13:02:53 -08:00
8021q net: vlan: suppress "failed to kill vid" warnings 2020-02-17 14:30:54 -08:00
appletalk
atm atm: fix a memory leak of vcc->user_back 2020-05-04 11:59:38 -07:00
ax25 net: Make sock protocol value checks more specific 2020-01-09 18:41:40 -08:00
batman-adv batman-adv: Fix refcnt leak in batadv_v_ogm_process 2020-04-21 10:08:05 +02:00
bluetooth Bluetooth: L2CAP: Use DEFER_SETUP to group ECRED connections 2020-03-25 22:16:08 +01:00
bpf bpf: Fix build warning regarding missing prototypes 2020-03-28 18:13:18 +01:00
bpfilter SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
bridge net: bridge: vlan: Add a schedule point during VLAN processing 2020-04-30 17:45:41 -07:00
caif net: caif: Add lockdep expression to RCU traversal primitive 2020-03-11 22:55:25 -07:00
can can: j1939: j1939_sk_bind(): take priv after lock is held 2019-12-08 11:52:02 +01:00
ceph libceph: directly skip to the end of redirect reply 2020-03-30 12:42:41 +02:00
core netprio_cgroup: Fix unlimited memory leak of v2 cgroups 2020-05-09 20:59:21 -07:00
dcb
dccp Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2020-02-29 15:53:35 -08:00
decnet Remove DST_HOST 2020-03-23 21:57:44 -07:00
dns_resolver KEYS: Don't write out to userspace while holding key semaphore 2020-03-29 12:40:41 +01:00
dsa net: dsa: Do not leave DSA master with NULL netdev_ops 2020-05-06 17:31:54 -07:00
ethernet net: remove eth_change_mtu 2020-01-27 11:09:31 +01:00
ethtool ethtool: provide timestamping information with TSINFO_GET request 2020-03-29 22:32:37 -07:00
hsr net: hsr: fix incorrect type usage for protocol variable 2020-05-06 15:00:20 -07:00
ieee802154 nl802154: add missing attribute validation for dev_type 2020-03-03 13:28:48 -08:00
ife
ipv4 tcp: fix SO_RCVLOWAT hangs with fat skbs 2020-05-12 12:49:47 -07:00
ipv6 Revert "ipv6: add mtu lock check in __ip6_rt_update_pmtu" 2020-05-07 17:29:12 -07:00
iucv treewide: Use sizeof_field() macro 2019-12-09 10:36:44 -08:00
kcm net: kcm: kcmproc.c: Fix RCU list suspicious usage warning 2020-03-16 17:14:02 -07:00
key
l2tp l2tp: Allow management of tunnels and session in user namespace 2020-04-08 14:30:46 -07:00
l3mdev
lapb
llc af_llc: fix if-statement empty body warning 2020-02-26 20:38:13 -08:00
mac80211 mac80211: sta_info: Add lockdep condition for RCU list usage 2020-04-24 11:31:20 +02:00
mac802154
mpls net: add net available in build_state 2020-03-29 22:30:57 -07:00
mptcp mptcp: Initialize map_seq upon subflow establishment 2020-05-12 12:08:22 -07:00
ncsi net/ncsi: Support for multi host mellanox card 2020-01-09 18:36:22 -08:00
netfilter netfilter: nf_osf: avoid passing pointer to local var 2020-04-29 21:17:57 +02:00
netlabel netlabel: Kconfig: Update reference for NetLabel Tools project 2020-04-22 19:55:01 -07:00
netlink Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-03-25 18:58:11 -07:00
netrom net: netrom: Fix potential nr_neigh refcnt leak in nr_add_node 2020-04-18 13:09:46 -07:00
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-03-12 22:34:48 -07:00
nsh
openvswitch net: openvswitch: ovs_ct_exit to be done under ovs_lock 2020-04-20 10:53:54 -07:00
packet net/packet: tpacket_rcv: avoid a producer race condition 2020-03-15 00:25:25 -07:00
phonet net: Remove redundant BUG_ON() check in phonet_pernet 2020-01-03 12:25:50 -08:00
psample net: psample: fix skb_over_panic 2019-11-26 14:40:13 -08:00
qrtr net: qrtr: send msgs from local of same id as broadcast 2020-04-09 10:08:31 -07:00
rds net/rds: Use ERR_PTR for rds_message_alloc_sgs() 2020-04-15 12:33:29 -07:00
rfkill rfkill: Fix incorrect check to avoid NULL pointer dereference 2019-12-16 10:15:49 +01:00
rose Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-01-26 10:40:21 +01:00
rxrpc rxrpc: Fix DATA Tx to disable nofrag for UDP on AF_INET6 socket 2020-04-14 16:26:47 -07:00
sched net: flow_offload: skip hw stats check for FLOW_ACTION_HW_STATS_DONT_CARE 2020-05-06 20:13:10 -07:00
sctp sctp: Fix SHUTDOWN CTSN Ack in the peer restart case 2020-04-22 19:27:40 -07:00
smc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-03-12 22:34:48 -07:00
strparser
sunrpc NFS client bugfixes for Linux 5.7 2020-05-02 11:24:01 -07:00
switchdev net: switchdev: do not propagate bridge updates across bridges 2020-02-26 20:58:33 -08:00
tipc tipc: fix partial topology connection closure 2020-05-04 10:31:13 -07:00
tls net/tls: Fix sk_psock refcnt leak when in tls_data_ready() 2020-04-27 11:22:38 -07:00
unix net: datagram: drop 'destructor' argument from several helpers 2020-02-28 12:12:53 -08:00
vmw_vsock vsock/virtio: fix multiple packet delivery to monitoring devices 2020-04-27 10:18:01 -07:00
wimax
wireless nl80211: fix NL80211_ATTR_FTM_RESPONDER policy 2020-04-14 12:28:48 +02:00
x25 net/x25: Fix null-ptr-deref in x25_disconnect 2020-04-28 14:08:59 -07:00
xdp xsk: Add missing check on user supplied headroom size 2020-04-15 13:07:18 +02:00
xfrm Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2020-03-30 10:59:20 -07:00
compat.c net: abstract out normal and compat msghdr import 2020-03-10 09:12:49 -06:00
Kconfig net: Fix CONFIG_NET_CLS_ACT=n and CONFIG_NFT_FWD_NETDEV={y, m} build 2020-03-25 12:24:33 -07:00
Makefile mptcp: Add MPTCP socket stubs 2020-01-24 13:44:07 +01:00
socket.c for-5.7/io_uring-2020-03-29 2020-03-30 12:18:49 -07:00
sysctl_net.c