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849b425cd0
linux/net
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Eric Dumazet 849b425cd0 tcp: fix possible freeze in tx path under memory pressure 
Blamed commit only dealt with applications issuing small writes.

Issue here is that we allow to force memory schedule for the sk_buff
allocation, but we have no guarantee that sendmsg() is able to
copy some payload in it.

In this patch, I make sure the socket can use up to tcp_wmem[0] bytes.

For example, if we consider tcp_wmem[0] = 4096 (default on x86),
and initial skb->truesize being 1280, tcp_sendmsg() is able to
copy up to 2816 bytes under memory pressure.

Before this patch a sendmsg() sending more than 2816 bytes
would either block forever (if persistent memory pressure),
or return -EAGAIN.

For bigger MTU networks, it is advised to increase tcp_wmem[0]
to avoid sending too small packets.

v2: deal with zero copy paths.

Fixes: 8e4d980ac2 ("tcp: fix behavior for epoll edge trigger")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: Wei Wang <weiwan@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-06-17 10:03:42 +01:00
..
6lowpan net: 6lowpan: constify lowpan_nhc structures 2022-06-09 21:53:28 +02:00
9p xen: switch gnttab_end_foreign_access() to take a struct page pointer 2022-05-27 11:05:29 +02:00
802
8021q vlan: adopt u64_stats_t 2022-06-09 21:53:09 -07:00
appletalk net: remove noblock parameter from skb_recv_datagram() 2022-04-06 13:45:26 +01:00
atm net: SO_RCVMARK socket option for SO_MARK with recvmsg() 2022-04-28 13:08:15 -07:00
ax25 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-06-16 20:13:52 -07:00
batman-adv net: wrap the wireless pointers in struct net_device in an ifdef 2022-05-22 21:51:54 +01:00
bluetooth bluetooth: don't use bitmaps for random flag accesses 2022-06-05 16:28:41 -07:00
bpf Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-05-23 16:07:14 -07:00
bpfilter uaccess: remove CONFIG_SET_FS 2022-02-25 09:36:06 +01:00
bridge net: bridge: allow add/remove permanent mdb entries on disabled ports 2022-06-15 09:35:21 +01:00
caif net: remove noblock parameter from skb_recv_datagram() 2022-04-06 13:45:26 +01:00
can can: isotp: isotp_bind(): do not validate unused address information 2022-05-19 22:11:28 +02:00
ceph libceph: use swap() macro instead of taking tmp variable 2022-05-25 20:45:13 +02:00
core net: don't check skb_count twice 2022-06-15 12:51:31 +01:00
dcb net: dcb: disable softirqs in dcbnl_flush_dev() 2022-03-03 08:01:55 -08:00
dccp Revert "net: Add a second bind table hashed by port and address" 2022-06-16 11:07:59 -07:00
decnet net: add per_cpu_fw_alloc field to struct proto 2022-06-10 16:21:26 -07:00
dns_resolver
dsa net: adopt u64_stats_t in struct pcpu_sw_netstats 2022-06-09 21:53:11 -07:00
ethernet net: ethernet: set default assignment identifier to NET_NAME_ENUM 2022-04-07 21:04:03 -07:00
ethtool ethtool: Fix and simplify ethtool_convert_link_mode_to_legacy_u32() 2022-06-13 23:11:35 -07:00
hsr net: add per-cpu storage and net->core_stats 2022-03-11 23:17:24 -08:00
ieee802154 net: SO_RCVMARK socket option for SO_MARK with recvmsg() 2022-04-28 13:08:15 -07:00
ife
ipv4 tcp: fix possible freeze in tx path under memory pressure 2022-06-17 10:03:42 +01:00
ipv6 net: add per_cpu_fw_alloc field to struct proto 2022-06-10 16:21:26 -07:00
iucv net: keep sk->sk_forward_alloc as small as possible 2022-06-10 16:21:27 -07:00
kcm
key Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec 2022-06-01 17:44:04 -07:00
l2tp ipv6: Fix signed integer overflow in l2tp_ip6_sendmsg 2022-06-08 10:56:43 -07:00
l3mdev l3mdev: l3mdev_master_upper_ifindex_by_index_rcu should be using netdev_master_upper_dev_get_rcu 2022-04-15 14:27:24 -07:00
lapb
llc net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
mac80211 wireless-next patches for v5.20 2022-06-10 08:57:35 -07:00
mac802154 net: mac802154: Fix symbol durations 2022-04-30 20:29:47 +02:00
mctp Networking changes for 5.19. 2022-05-25 12:22:58 -07:00
mpls net: mpls: fix memdup.cocci warning 2022-04-07 21:06:41 -07:00
mptcp net: keep sk->sk_forward_alloc as small as possible 2022-06-10 16:21:27 -07:00
ncsi all: replace find_next{,_zero}_bit with find_first{,_zero}_bit where appropriate 2022-01-15 08:47:31 -08:00
netfilter netfilter: nf_tables: bail out early if hardware offload is not supported 2022-06-06 19:19:15 +02:00
netlabel netlabel: fix out-of-bounds memory accesses 2022-03-21 10:59:11 +00:00
netlink Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-05-12 16:15:30 -07:00
netrom net: remove noblock parameter from skb_recv_datagram() 2022-04-06 13:45:26 +01:00
nfc net: nfc: Directly use ida_alloc()/free() 2022-05-28 15:28:47 +01:00
nsh
openvswitch net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
packet net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
phonet net: remove noblock parameter from recvmsg() entities 2022-04-12 15:00:25 +02:00
psample
qrtr net: remove noblock parameter from skb_recv_datagram() 2022-04-06 13:45:26 +01:00
rds Linux 5.18 2022-05-24 12:40:28 -03:00
rfkill rfkill: make new event layout opt-in 2022-03-18 13:09:17 +02:00
rose ROSE: Remove unused code and clean up some inconsistent indenting 2022-05-09 17:19:27 -07:00
rxrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-05-23 21:19:17 -07:00
sched net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
sctp net: keep sk->sk_forward_alloc as small as possible 2022-06-10 16:21:27 -07:00
smc net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
strparser
sunrpc Notable changes: 2022-06-10 17:28:43 -07:00
switchdev net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
tipc net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
tls tls: Rename TLS_INFO_ZC_SENDFILE to TLS_INFO_ZC_TX 2022-06-09 21:51:57 -07:00
unix af_unix: use DEBUG_NET_WARN_ON_ONCE() 2022-06-09 21:53:56 -07:00
vmw_vsock hyperv-next for 5.19 2022-05-28 11:39:01 -07:00
wireless wireless-next patches for v5.19 2022-05-19 13:01:08 -07:00
x25 x25: remove redundant pointer dev 2022-05-10 11:59:22 +02:00
xdp xsk: Fix handling of invalid descriptors in XSK TX batching API 2022-06-08 16:20:07 +02:00
xfrm net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
compat.c
devres.c
Kconfig page_pool: Add allocation stats 2022-03-03 09:55:28 +00:00
Kconfig.debug net: CONFIG_DEBUG_NET depends on CONFIG_NET 2022-06-02 10:15:05 -07:00
Makefile
socket.c net: make __sys_accept4_file() static 2022-06-13 13:47:15 +01:00
sysctl_net.c