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862b3d2090
linux/drivers/net/ethernet
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Salil 862b3d2090 net: hns: Fix to conditionally convey RX checksum flag to stack 
This patch introduces the RX checksum function to check the
status of the hardware calculated checksum and its error and
appropriately convey status to the upper stack in skb->ip_summed
field.

In hardware, we only support checksum for the following
protocols:
1) IPv4,
2) TCP(over IPv4 or IPv6),
3) UDP(over IPv4 or IPv6),
4) SCTP(over IPv4 or IPv6)
but we support many L3(IPv4, IPv6, MPLS, PPPoE etc) and
L4(TCP, UDP, GRE, SCTP, IGMP, ICMP etc.) protocols.

Hardware limitation:
Our present hardware RX Descriptor lacks L3/L4 checksum
"Status & Error" bit (which usually can be used to indicate whether
checksum was calculated by the hardware and if there was any error
encountered during checksum calculation).

Software workaround:
We do get info within the RX descriptor about the kind of
L3/L4 protocol coming in the packet and the error status. These
errors might not just be checksum errors but could be related to
version, length of IPv4, UDP, TCP etc.
Because there is no-way of knowing if it is a L3/L4 error due
to bad checksum or any other L3/L4 error, we will not (cannot)
convey hardware checksum status(CHECKSUM_UNNECESSARY) for such
cases to upper stack and will not maintain the RX L3/L4 checksum
counters as well.

Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-12-06 11:41:57 -05:00
..
3com net: 3com: typhoon: fix typhoon_get_link_ksettings 2016-11-09 13:25:14 -05:00
8390 net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
adaptec net: adaptec: starfire: use new api ethtool_{get|set}_link_ksettings 2016-11-09 13:25:12 -05:00
adi net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
aeroflex net: phy: expose phy_aneg_done API for use by drivers 2016-11-13 00:56:26 -05:00
agere ethernet: use core min/max MTU checking 2016-10-18 11:34:22 -04:00
alacritech net: ethernet: slicoss: add slicoss gigabit ethernet driver 2016-12-06 11:24:28 -05:00
allwinner net: ethernet: sun4i-emac: Read rxhdr in CPU byte-order 2016-11-15 22:05:54 -05:00
alteon net: alteon: acenic: use new api ethtool_{get|set}_link_ksettings 2016-11-09 13:25:12 -05:00
altera Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-12-03 12:29:53 -05:00
amazon net: ena: use setup_timer() and mod_timer() 2016-10-26 17:21:59 -04:00
amd Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-12-03 12:29:53 -05:00
apm drivers: net: xgene: ethtool: Add get/set_pauseparam 2016-12-03 15:46:50 -05:00
apple net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
arc net: arc_emac: add dependencies on associated arches and compile test 2016-11-29 18:57:36 -05:00
atheros alx: enable multiple tx queues 2016-11-15 22:46:30 -05:00
aurora Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-12-03 12:29:53 -05:00
broadcom bnxt_en: Add PFC statistics. 2016-12-05 13:21:40 -05:00
brocade net: brocade: bna: use new api ethtool_{get|set}_link_ksettings 2016-11-30 10:29:02 -05:00
cadence Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-12-03 12:29:53 -05:00
calxeda net: calxeda: xgmac: use new api ethtool_{get|set}_link_ksettings 2016-12-05 15:34:33 -05:00
cavium net: thunderx: Fix transmit queue timeout issue 2016-12-02 13:32:59 -05:00
chelsio Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-12-03 12:29:53 -05:00
cirrus net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
cisco enic: set skb->hash type properly 2016-11-02 15:32:53 -04:00
davicom net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
dec net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
dlink ethernet/dlink: use core min/max MTU checking 2016-10-18 11:34:20 -04:00
emulex Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-11-22 13:27:16 -05:00
ezchip net: nps_enet: Fix module autoload 2016-10-17 13:03:02 -04:00
faraday net/faraday: Stop NCSI device on shutdown 2016-10-04 02:11:51 -04:00
freescale Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-12-03 12:29:53 -05:00
fujitsu net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
hisilicon net: hns: Fix to conditionally convey RX checksum flag to stack 2016-12-06 11:41:57 -05:00
hp net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
i825xx net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
ibm ehea: Remove unnecessary memset of stats in netdev private data 2016-11-30 14:26:26 -05:00
intel Merge branch '40GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue 2016-12-03 19:10:48 -05:00
marvell Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-12-03 12:29:53 -05:00
mediatek Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-12-03 12:29:53 -05:00
mellanox ipv4: fib: Replay events when registering FIB notifier 2016-12-03 19:29:35 -05:00
micrel ethernet: use core min/max MTU checking 2016-10-18 11:34:22 -04:00
microchip net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
moxa net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
myricom myri10ge: fix typo in parameter description 2016-10-20 14:47:53 -04:00
natsemi net: ns83820: use dev_kfree_skb_irq instead of kfree_skb 2016-10-26 17:21:59 -04:00
neterion ethernet/neterion: use core min/max MTU checking 2016-10-18 11:34:20 -04:00
netronome bpf, xdp: drop rcu_read_lock from bpf_prog_run_xdp and move to caller 2016-12-02 11:06:24 -05:00
nuvoton net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
nvidia ethernet: use core min/max MTU checking 2016-10-18 11:34:22 -04:00
nxp net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
oki-semi ethernet: use core min/max MTU checking 2016-10-18 11:34:22 -04:00
packetengines net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
pasemi ethernet: use core min/max MTU checking 2016-10-18 11:34:22 -04:00
qlogic qede: use reset to set network header 2016-12-03 15:49:16 -05:00
qualcomm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-12-03 12:29:53 -05:00
rdc net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
realtek r8169: Add support for restarting auto-negotiation 2016-12-05 13:38:43 -05:00
renesas Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-12-03 12:29:53 -05:00
rocker ipv4: fib: Replay events when registering FIB notifier 2016-12-03 19:29:35 -05:00
samsung ethernet: use core min/max MTU checking 2016-10-18 11:34:22 -04:00
seeq net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
sfc sfc: remove EFX_BUG_ON_PARANOID, use EFX_WARN_ON_[ONCE_]PARANOID instead 2016-12-03 16:11:00 -05:00
sgi net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
silan net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
sis net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
smsc net: ethernet: smsc9420: Utilize phy_ethtool_nway_reset 2016-11-15 16:33:35 -05:00
stmicro net: stmmac: unify mdio functions 2016-12-03 15:23:51 -05:00
sun Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-11-22 13:27:16 -05:00
synopsys Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-12-03 12:29:53 -05:00
tehuti ethernet: use core min/max MTU checking 2016-10-18 11:34:22 -04:00
ti net: ethernet: ti: cpsw: fix early budget split 2016-12-06 11:37:21 -05:00
tile ethernet/tile: use core min/max MTU checking 2016-10-18 11:34:21 -04:00
toshiba Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-11-15 10:54:36 -05:00
tundra net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
via ethernet: use core min/max MTU checking 2016-10-18 11:34:22 -04:00
wiznet net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
xilinx net: ethernet: ll_temac: Utilize phy_ethtool_nway_reset 2016-11-15 16:33:35 -05:00
xircom net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
xscale net: ethernet: ixp4xx_eth: Utilize phy_ethtool_nway_reset 2016-11-15 16:33:35 -05:00
dnet.c net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
dnet.h
ec_bhf.c net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
ethoc.c net: ethoc: Demote packet dropped error message to debug 2016-12-05 15:30:04 -05:00
fealnx.c net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
jme.c ethernet: use net core MTU range checking in more drivers 2016-10-20 14:51:08 -04:00
jme.h
Kconfig net: ethernet: slicoss: add slicoss gigabit ethernet driver 2016-12-06 11:24:28 -05:00
korina.c net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00
lantiq_etop.c net: ethernet: lantiq_etop: Utilize phy_ethtool_nway_reset 2016-11-15 16:33:35 -05:00
Makefile net: ethernet: slicoss: add slicoss gigabit ethernet driver 2016-12-06 11:24:28 -05:00
netx-eth.c net: deprecate eth_change_mtu, remove usage 2016-10-13 09:36:57 -04:00