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Menglong Dong 0c6de0c943 net: tipc: fix FB_MTU eat two pages 
FB_MTU is used in 'tipc_msg_build()' to alloc smaller skb when memory
allocation fails, which can avoid unnecessary sending failures.

The value of FB_MTU now is 3744, and the data size will be:

  (3744 + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) + \
    SKB_DATA_ALIGN(BUF_HEADROOM + BUF_TAILROOM + 3))

which is larger than one page(4096), and two pages will be allocated.

To avoid it, replace '3744' with a calculation:

  (PAGE_SIZE - SKB_DATA_ALIGN(BUF_OVERHEAD) - \
    SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))

What's more, alloc_skb_fclone() will call SKB_DATA_ALIGN for data size,
and it's not necessary to make alignment for buf_size in
tipc_buf_acquire(). So, just remove it.

Fixes: 4c94cc2d3d ("tipc: fall back to smaller MTU if allocation of local send skb fails")
Signed-off-by: Menglong Dong <dong.menglong@zte.com.cn>
Acked-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-06-28 13:31:57 -07:00
..
6lowpan
9p 9p/trans_virtio: Fix spelling mistakes 2021-06-02 14:01:55 -07:00
802
8021q net: vlan: pass thru all GSO_SOFTWARE in hw_enc_features 2021-06-18 11:58:03 -07:00
appletalk Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-06-18 19:47:02 -07:00
atm atm: Use list_for_each_entry() to simplify code in resources.c 2021-06-10 14:08:09 -07:00
ax25
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-06-18 19:47:02 -07:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-06-18 19:47:02 -07:00
bpf
bpfilter
bridge bridge: cfm: remove redundant return 2021-06-22 10:35:15 -07:00
caif net: caif: modify the label out_err to out 2021-06-18 12:07:09 -07:00
can Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-06-18 19:47:02 -07:00
ceph libceph: Fix spelling mistakes 2021-06-03 13:24:23 -07:00
core net: retrieve netns cookie via getsocketopt 2021-06-24 11:13:05 -07:00
dcb net: dcb: Return the correct errno code 2021-06-01 17:01:33 -07:00
dccp dccp: tfrc: fix doc warnings in tfrc_equation.c 2021-06-10 14:08:49 -07:00
decnet decnet: Fix spelling mistakes 2021-06-02 14:01:55 -07:00
dns_resolver
dsa net: dsa: remove cross-chip support from the MRP notifiers 2021-06-21 12:50:20 -07:00
ethernet
ethtool ethtool: Validate module EEPROM offset as part of policy 2021-06-22 10:40:54 -07:00
hsr net: hsr: don't check sequence number if tag removal is offloaded 2021-06-16 12:13:01 -07:00
ieee802154 ieee802154: fix error return code in ieee802154_llsec_getparams() 2021-06-03 10:59:49 +02:00
ife
ipv4 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git 2021-06-28 13:17:16 -07:00
ipv6 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git 2021-06-28 13:17:16 -07:00
iucv net/af_iucv: clean up some forward declarations 2021-06-12 13:06:33 -07:00
kcm revert "net: kcm: fix memory leak in kcm_sendmsg" 2021-06-07 13:34:37 -07:00
key
l2tp l2tp: Fix spelling mistakes 2021-06-07 14:08:30 -07:00
l3mdev
lapb net: lapb: Use list_for_each_entry() to simplify code in lapb_iface.c 2021-06-08 16:31:25 -07:00
llc
mac80211 mac80211: Switch to a virtual time-based airtime scheduler 2021-06-23 18:12:00 +02:00
mac802154
mpls
mptcp mptcp: fix 'masking a bool' warning 2021-06-28 13:04:06 -07:00
ncsi net/ncsi: Fix spelling mistakes 2021-06-07 14:08:30 -07:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2021-06-23 12:31:28 -07:00
netlabel netlabel: Fix memory leak in netlbl_mgmt_add_common 2021-06-15 11:19:04 -07:00
netlink
netrom
nfc Merge ra.kernel.org:/pub/scm/linux/kernel/git/netdev/net 2021-06-07 13:01:52 -07:00
nsh
openvswitch openvswitch: add trace points 2021-06-22 10:47:32 -07:00
packet Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-06-18 19:47:02 -07:00
phonet
psample
qrtr Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-06-18 19:47:02 -07:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-06-18 19:47:02 -07:00
rfkill
rose
rxrpc rxrpc: Fix a typo 2021-06-02 14:01:55 -07:00
sched net: sched: remove qdisc->empty for lockless qdisc 2021-06-23 12:17:35 -07:00
sctp sctp: send the next probe immediately once the last one is acked 2021-06-24 12:58:03 -07:00
smc net/smc: Ensure correct state of the socket in send path 2021-06-25 11:53:51 -07:00
strparser
sunrpc
switchdev
tipc net: tipc: fix FB_MTU eat two pages 2021-06-28 13:31:57 -07:00
tls skbuff: add a parameter to __skb_frag_unref 2021-06-07 14:11:47 -07:00
unix __unix_find_socket_byname(): don't pass hash and type separately 2021-06-21 12:28:49 -07:00
vmw_vsock virtio/vsock: avoid NULL deref in virtio_transport_seqpacket_allow() 2021-06-22 09:49:37 -07:00
wireless cfg80211: Support hidden AP discovery over 6GHz band 2021-06-23 13:05:09 +02:00
x25 net: x25: Use list_for_each_entry() to simplify code in x25_route.c 2021-06-10 14:08:09 -07:00
xdp
xfrm Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git 2021-06-28 13:17:16 -07:00
compat.c net: Return the correct errno code 2021-06-03 15:13:56 -07:00
devres.c net: devres: Correct a grammatical error 2021-06-11 12:55:28 -07:00
Kconfig
Makefile
socket.c net: add pf_family_names[] for protocol family 2021-06-21 14:41:54 -07:00
sysctl_net.c