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ethernet: fix PTP_1588_CLOCK dependencies 

The 'imply' keyword does not do what most people think it does, it only
politely asks Kconfig to turn on another symbol, but does not prevent
it from being disabled manually or built as a loadable module when the
user is built-in. In the ICE driver, the latter now causes a link failure:

aarch64-linux-ld: drivers/net/ethernet/intel/ice/ice_main.o: in function `ice_eth_ioctl':
ice_main.c:(.text+0x13b0): undefined reference to `ice_ptp_get_ts_config'
ice_main.c:(.text+0x13b0): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `ice_ptp_get_ts_config'
aarch64-linux-ld: ice_main.c:(.text+0x13bc): undefined reference to `ice_ptp_set_ts_config'
ice_main.c:(.text+0x13bc): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `ice_ptp_set_ts_config'
aarch64-linux-ld: drivers/net/ethernet/intel/ice/ice_main.o: in function `ice_prepare_for_reset':
ice_main.c:(.text+0x31fc): undefined reference to `ice_ptp_release'
ice_main.c:(.text+0x31fc): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `ice_ptp_release'
aarch64-linux-ld: drivers/net/ethernet/intel/ice/ice_main.o: in function `ice_rebuild':

This is a recurring problem in many drivers, and we have discussed
it several times befores, without reaching a consensus. I'm providing
a link to the previous email thread for reference, which discusses
some related problems.

To solve the dependency issue better than the 'imply' keyword, introduce a
separate Kconfig symbol "CONFIG_PTP_1588_CLOCK_OPTIONAL" that any driver
can depend on if it is able to use PTP support when available, but works
fine without it. Whenever CONFIG_PTP_1588_CLOCK=m, those drivers are
then prevented from being built-in, the same way as with a 'depends on
PTP_1588_CLOCK || !PTP_1588_CLOCK' dependency that does the same trick,
but that can be rather confusing when you first see it.

Since this should cover the dependencies correctly, the IS_REACHABLE()
hack in the header is no longer needed now, and can be turned back
into a normal IS_ENABLED() check. Any driver that gets the dependency
wrong will now cause a link time failure rather than being unable to use
PTP support when that is in a loadable module.

However, the two recently added ptp_get_vclocks_index() and
ptp_convert_timestamp() interfaces are only called from builtin code with
ethtool and socket timestamps, so keep the current behavior by stubbing
those out completely when PTP is in a loadable module. This should be
addressed properly in a follow-up.

As Richard suggested, we may want to actually turn PTP support into a
'bool' option later on, preventing it from being a loadable module
altogether, which would be one way to solve the problem with the ethtool
interface.

Fixes: 06c16d89d2 ("ice: register 1588 PTP clock device object for E810 devices")
Link: https://lore.kernel.org/netdev/20210804121318.337276-1-arnd@kernel.org/
Link: https://lore.kernel.org/netdev/CAK8P3a06enZOf=XyZ+zcAwBczv41UuCTz+=0FMf2gBz1_cOnZQ@mail.gmail.com/
Link: https://lore.kernel.org/netdev/CAK8P3a3=eOxE-K25754+fB_-i_0BZzf9a9RfPTX3ppSwu9WZXw@mail.gmail.com/
Link: https://lore.kernel.org/netdev/20210726084540.3282344-1-arnd@kernel.org/
Acked-by: Shannon Nelson <snelson@pensando.io>
Acked-by: Jacob Keller <jacob.e.keller@intel.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20210812183509.1362782-1-arnd@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Arnd Bergmann 2021-08-12 20:33:58 +02:00 committed by Jakub Kicinski
parent b697d9d38a
commit e5f3155267
29 changed files with 81 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/dsa/mv88e6xxx/Kconfig
View File

@ -2,6 +2,7 @@
config NET_DSA_MV88E6XXX
tristate "Marvell 88E6xxx Ethernet switch fabric support"
depends on NET_DSA
depends on PTP_1588_CLOCK_OPTIONAL
select IRQ_DOMAIN
select NET_DSA_TAG_EDSA
select NET_DSA_TAG_DSA

2
drivers/net/dsa/ocelot/Kconfig
View File

@ -5,6 +5,7 @@ config NET_DSA_MSCC_FELIX
depends on NET_VENDOR_MICROSEMI
depends on NET_VENDOR_FREESCALE
depends on HAS_IOMEM
depends on PTP_1588_CLOCK_OPTIONAL
select MSCC_OCELOT_SWITCH_LIB
select NET_DSA_TAG_OCELOT_8021Q
select NET_DSA_TAG_OCELOT
@ -19,6 +20,7 @@ config NET_DSA_MSCC_SEVILLE
depends on NET_DSA
depends on NET_VENDOR_MICROSEMI
depends on HAS_IOMEM
depends on PTP_1588_CLOCK_OPTIONAL
select MSCC_OCELOT_SWITCH_LIB
select NET_DSA_TAG_OCELOT_8021Q
select NET_DSA_TAG_OCELOT

1
drivers/net/dsa/sja1105/Kconfig
View File

@ -2,6 +2,7 @@
config NET_DSA_SJA1105
tristate "NXP SJA1105 Ethernet switch family support"
depends on NET_DSA && SPI
depends on PTP_1588_CLOCK_OPTIONAL
select NET_DSA_TAG_SJA1105
select PCS_XPCS
select PACKING

2
drivers/net/ethernet/amd/Kconfig
View File

@ -170,11 +170,11 @@ config AMD_XGBE
tristate "AMD 10GbE Ethernet driver"
depends on ((OF_NET && OF_ADDRESS) || ACPI || PCI) && HAS_IOMEM
depends on X86 || ARM64 || COMPILE_TEST
depends on PTP_1588_CLOCK_OPTIONAL
select BITREVERSE
select CRC32
select PHYLIB
select AMD_XGBE_HAVE_ECC if X86
imply PTP_1588_CLOCK
help
This driver supports the AMD 10GbE Ethernet device found on an
AMD SoC.

6
drivers/net/ethernet/broadcom/Kconfig
View File

@ -122,8 +122,8 @@ config SB1250_MAC
config TIGON3
tristate "Broadcom Tigon3 support"
depends on PCI
depends on PTP_1588_CLOCK_OPTIONAL
select PHYLIB
imply PTP_1588_CLOCK
help
This driver supports Broadcom Tigon3 based gigabit Ethernet cards.
@ -140,7 +140,7 @@ config TIGON3_HWMON
config BNX2X
tristate "Broadcom NetXtremeII 10Gb support"
depends on PCI
imply PTP_1588_CLOCK
depends on PTP_1588_CLOCK_OPTIONAL
select FW_LOADER
select ZLIB_INFLATE
select LIBCRC32C
@ -206,7 +206,7 @@ config SYSTEMPORT
config BNXT
tristate "Broadcom NetXtreme-C/E support"
depends on PCI
imply PTP_1588_CLOCK
depends on PTP_1588_CLOCK_OPTIONAL
select FW_LOADER
select LIBCRC32C
select NET_DEVLINK

1
drivers/net/ethernet/cadence/Kconfig
View File

@ -22,6 +22,7 @@ if NET_VENDOR_CADENCE
config MACB
tristate "Cadence MACB/GEM support"
depends on HAS_DMA && COMMON_CLK
depends on PTP_1588_CLOCK_OPTIONAL
select PHYLINK
select CRC32
help

4
drivers/net/ethernet/cavium/Kconfig
View File

@ -66,7 +66,7 @@ config LIQUIDIO
tristate "Cavium LiquidIO support"
depends on 64BIT && PCI
depends on PCI
imply PTP_1588_CLOCK
depends on PTP_1588_CLOCK_OPTIONAL
select FW_LOADER
select LIBCRC32C
select NET_DEVLINK
@ -91,7 +91,7 @@ config OCTEON_MGMT_ETHERNET
config LIQUIDIO_VF
tristate "Cavium LiquidIO VF support"
depends on 64BIT && PCI_MSI
imply PTP_1588_CLOCK
depends on PTP_1588_CLOCK_OPTIONAL
help
This driver supports Cavium LiquidIO Intelligent Server Adapter
based on CN23XX chips.

1
drivers/net/ethernet/chelsio/Kconfig
View File

@ -69,6 +69,7 @@ config CHELSIO_T3
config CHELSIO_T4
tristate "Chelsio Communications T4/T5/T6 Ethernet support"
depends on PCI && (IPV6 || IPV6=n) && (TLS || TLS=n)
depends on PTP_1588_CLOCK_OPTIONAL
select FW_LOADER
select MDIO
select ZLIB_DEFLATE

2
drivers/net/ethernet/freescale/Kconfig
View File

@ -25,10 +25,10 @@ config FEC
depends on (M523x || M527x || M5272 || M528x || M520x || M532x || \
ARCH_MXC || SOC_IMX28 || COMPILE_TEST)
default ARCH_MXC || SOC_IMX28 if ARM
depends on PTP_1588_CLOCK_OPTIONAL
select CRC32
select PHYLIB
imply NET_SELFTESTS
imply PTP_1588_CLOCK
help
Say Y here if you want to use the built-in 10/100 Fast ethernet
controller on some Motorola ColdFire and Freescale i.MX processors.

2
drivers/net/ethernet/hisilicon/Kconfig
View File

@ -104,7 +104,7 @@ config HNS3_HCLGE
tristate "Hisilicon HNS3 HCLGE Acceleration Engine & Compatibility Layer Support"
default m
depends on PCI_MSI
imply PTP_1588_CLOCK
depends on PTP_1588_CLOCK_OPTIONAL
help
This selects the HNS3_HCLGE network acceleration engine & its hardware
compatibility layer. The engine would be used in Hisilicon hip08 family of

12
drivers/net/ethernet/intel/Kconfig
View File

@ -58,8 +58,8 @@ config E1000
config E1000E
tristate "Intel(R) PRO/1000 PCI-Express Gigabit Ethernet support"
depends on PCI && (!SPARC32 || BROKEN)
depends on PTP_1588_CLOCK_OPTIONAL
select CRC32
imply PTP_1588_CLOCK
help
This driver supports the PCI-Express Intel(R) PRO/1000 gigabit
ethernet family of adapters. For PCI or PCI-X e1000 adapters,
@ -87,7 +87,7 @@ config E1000E_HWTS
config IGB
tristate "Intel(R) 82575/82576 PCI-Express Gigabit Ethernet support"
depends on PCI
imply PTP_1588_CLOCK
depends on PTP_1588_CLOCK_OPTIONAL
select I2C
select I2C_ALGOBIT
help
@ -159,9 +159,9 @@ config IXGB
config IXGBE
tristate "Intel(R) 10GbE PCI Express adapters support"
depends on PCI
depends on PTP_1588_CLOCK_OPTIONAL
select MDIO
select PHYLIB
imply PTP_1588_CLOCK
help
This driver supports Intel(R) 10GbE PCI Express family of
adapters. For more information on how to identify your adapter, go
@ -239,7 +239,7 @@ config IXGBEVF_IPSEC
config I40E
tristate "Intel(R) Ethernet Controller XL710 Family support"
imply PTP_1588_CLOCK
depends on PTP_1588_CLOCK_OPTIONAL
depends on PCI
select AUXILIARY_BUS
help
@ -295,11 +295,11 @@ config ICE
tristate "Intel(R) Ethernet Connection E800 Series Support"
default n
depends on PCI_MSI
depends on PTP_1588_CLOCK_OPTIONAL
select AUXILIARY_BUS
select DIMLIB
select NET_DEVLINK
select PLDMFW
imply PTP_1588_CLOCK
help
This driver supports Intel(R) Ethernet Connection E800 Series of
devices. For more information on how to identify your adapter, go
@ -317,7 +317,7 @@ config FM10K
tristate "Intel(R) FM10000 Ethernet Switch Host Interface Support"
default n
depends on PCI_MSI
imply PTP_1588_CLOCK
depends on PTP_1588_CLOCK_OPTIONAL
help
This driver supports Intel(R) FM10000 Ethernet Switch Host
Interface. For more information on how to identify your adapter,

2
drivers/net/ethernet/marvell/octeontx2/Kconfig
View File

@ -12,6 +12,7 @@ config OCTEONTX2_AF
select NET_DEVLINK
depends on (64BIT && COMPILE_TEST) || ARM64
depends on PCI
depends on PTP_1588_CLOCK_OPTIONAL
help
This driver supports Marvell's OcteonTX2 Resource Virtualization
Unit's admin function manager which manages all RVU HW resources
@ -32,6 +33,7 @@ config OCTEONTX2_PF
select OCTEONTX2_MBOX
depends on (64BIT && COMPILE_TEST) || ARM64
depends on PCI
depends on PTP_1588_CLOCK_OPTIONAL
help
This driver supports Marvell's OcteonTX2 NIC physical function.

2
drivers/net/ethernet/mellanox/mlx4/Kconfig
View File

@ -6,8 +6,8 @@
config MLX4_EN
tristate "Mellanox Technologies 1/10/40Gbit Ethernet support"
depends on PCI && NETDEVICES && ETHERNET && INET
depends on PTP_1588_CLOCK_OPTIONAL
select MLX4_CORE
imply PTP_1588_CLOCK
help
This driver supports Mellanox Technologies ConnectX Ethernet
devices.

2
drivers/net/ethernet/mellanox/mlx5/core/Kconfig
View File

@ -10,7 +10,7 @@ config MLX5_CORE
select NET_DEVLINK
depends on VXLAN || !VXLAN
depends on MLXFW || !MLXFW
depends on PTP_1588_CLOCK || !PTP_1588_CLOCK
depends on PTP_1588_CLOCK_OPTIONAL
depends on PCI_HYPERV_INTERFACE || !PCI_HYPERV_INTERFACE
help
Core driver for low level functionality of the ConnectX-4 and

2
drivers/net/ethernet/mellanox/mlxsw/Kconfig
View File

@ -58,10 +58,10 @@ config MLXSW_SPECTRUM
depends on NET_IPGRE || NET_IPGRE=n
depends on IPV6_GRE || IPV6_GRE=n
depends on VXLAN || VXLAN=n
depends on PTP_1588_CLOCK_OPTIONAL
select GENERIC_ALLOCATOR
select PARMAN
select OBJAGG
imply PTP_1588_CLOCK
select NET_PTP_CLASSIFY if PTP_1588_CLOCK
default m
help

1
drivers/net/ethernet/microchip/Kconfig
View File

@ -45,6 +45,7 @@ config ENCX24J600
config LAN743X
tristate "LAN743x support"
depends on PCI
depends on PTP_1588_CLOCK_OPTIONAL
select PHYLIB
select CRC16
select CRC32

1
drivers/net/ethernet/mscc/Kconfig
View File

@ -24,6 +24,7 @@ config MSCC_OCELOT_SWITCH_LIB
config MSCC_OCELOT_SWITCH
tristate "Ocelot switch driver"
depends on PTP_1588_CLOCK_OPTIONAL
depends on BRIDGE || BRIDGE=n
depends on NET_SWITCHDEV
depends on HAS_IOMEM

1
drivers/net/ethernet/oki-semi/pch_gbe/Kconfig
View File

@ -6,6 +6,7 @@
config PCH_GBE
tristate "OKI SEMICONDUCTOR IOH(ML7223/ML7831) GbE"
depends on PCI && (X86_32 || COMPILE_TEST)
depends on PTP_1588_CLOCK
select MII
select PTP_1588_CLOCK_PCH
select NET_PTP_CLASSIFY

2
drivers/net/ethernet/pensando/Kconfig
View File

@ -20,7 +20,7 @@ if NET_VENDOR_PENSANDO
config IONIC
tristate "Pensando Ethernet IONIC Support"
depends on 64BIT && PCI
depends on PTP_1588_CLOCK || !PTP_1588_CLOCK
depends on PTP_1588_CLOCK_OPTIONAL
select NET_DEVLINK
select DIMLIB
help

2
drivers/net/ethernet/qlogic/Kconfig
View File

@ -99,7 +99,7 @@ config QED_SRIOV
config QEDE
tristate "QLogic QED 25/40/100Gb Ethernet NIC"
depends on QED
imply PTP_1588_CLOCK
depends on PTP_1588_CLOCK_OPTIONAL
help
This enables the support for Marvell FastLinQ adapters family,
ethernet driver.

2
drivers/net/ethernet/renesas/Kconfig
View File

@ -32,11 +32,11 @@ config SH_ETH
config RAVB
tristate "Renesas Ethernet AVB support"
depends on ARCH_RENESAS || COMPILE_TEST
depends on PTP_1588_CLOCK_OPTIONAL
select CRC32
select MII
select MDIO_BITBANG
select PHYLIB
imply PTP_1588_CLOCK
help
Renesas Ethernet AVB device driver.
This driver supports the following SoCs:

2
drivers/net/ethernet/samsung/Kconfig
View File

@ -20,9 +20,9 @@ if NET_VENDOR_SAMSUNG
config SXGBE_ETH
tristate "Samsung 10G/2.5G/1G SXGBE Ethernet driver"
depends on HAS_IOMEM && HAS_DMA
depends on PTP_1588_CLOCK_OPTIONAL
select PHYLIB
select CRC32
imply PTP_1588_CLOCK
help
This is the driver for the SXGBE 10G Ethernet IP block found on
Samsung platforms.

2
drivers/net/ethernet/sfc/Kconfig
View File

@ -19,9 +19,9 @@ if NET_VENDOR_SOLARFLARE
config SFC
tristate "Solarflare SFC9000/SFC9100/EF100-family support"
depends on PCI
depends on PTP_1588_CLOCK_OPTIONAL
select MDIO
select CRC32
imply PTP_1588_CLOCK
help
This driver supports 10/40-gigabit Ethernet cards based on
the Solarflare SFC9000-family and SFC9100-family controllers.

2
drivers/net/ethernet/stmicro/stmmac/Kconfig
View File

@ -2,12 +2,12 @@
config STMMAC_ETH
tristate "STMicroelectronics Multi-Gigabit Ethernet driver"
depends on HAS_IOMEM && HAS_DMA
depends on PTP_1588_CLOCK_OPTIONAL
select MII
select PCS_XPCS
select PAGE_POOL
select PHYLINK
select CRC32
imply PTP_1588_CLOCK
select RESET_CONTROLLER
help
This is the driver for the Ethernet IPs built around a

2
drivers/net/phy/Kconfig
View File

@ -236,6 +236,7 @@ config MICROCHIP_T1_PHY
config MICROSEMI_PHY
tristate "Microsemi PHYs"
depends on MACSEC || MACSEC=n
depends on PTP_1588_CLOCK_OPTIONAL || !NETWORK_PHY_TIMESTAMPING
select CRYPTO_LIB_AES if MACSEC
help
Currently supports VSC8514, VSC8530, VSC8531, VSC8540 and VSC8541 PHYs
@ -253,6 +254,7 @@ config NATIONAL_PHY
config NXP_C45_TJA11XX_PHY
tristate "NXP C45 TJA11XX PHYs"
depends on PTP_1588_CLOCK_OPTIONAL
help
Enable support for NXP C45 TJA11XX PHYs.
Currently supports only the TJA1103 PHY.

15
drivers/ptp/Kconfig
View File

@ -8,6 +8,7 @@ menu "PTP clock support"
config PTP_1588_CLOCK
tristate "PTP clock support"
depends on NET && POSIX_TIMERS
default ETHERNET
select PPS
select NET_PTP_CLASSIFY
help
@ -26,6 +27,18 @@ config PTP_1588_CLOCK
To compile this driver as a module, choose M here: the module
will be called ptp.
config PTP_1588_CLOCK_OPTIONAL
tristate
default y if PTP_1588_CLOCK=n
default PTP_1588_CLOCK
help
Drivers that can optionally use the PTP_1588_CLOCK framework
should depend on this symbol to prevent them from being built
into vmlinux while the PTP support itself is in a loadable
module.
If PTP support is disabled, this dependency will still be
met, and drivers refer to dummy helpers.
config PTP_1588_CLOCK_DTE
tristate "Broadcom DTE as PTP clock"
depends on PTP_1588_CLOCK
@ -91,7 +104,7 @@ config PTP_1588_CLOCK_PCH
tristate "Intel PCH EG20T as PTP clock"
depends on X86_32 || COMPILE_TEST
depends on HAS_IOMEM && NET
imply PTP_1588_CLOCK
depends on PTP_1588_CLOCK
help
This driver adds support for using the PCH EG20T as a PTP
clock. The hardware supports time stamping of PTP packets

2
drivers/ptp/ptp_vclock.c
View File

@ -149,6 +149,7 @@ void ptp_vclock_unregister(struct ptp_vclock *vclock)
kfree(vclock);
}
#if IS_BUILTIN(CONFIG_PTP_1588_CLOCK)
int ptp_get_vclocks_index(int pclock_index, int **vclock_index)
{
char name[PTP_CLOCK_NAME_LEN] = "";
@ -217,3 +218,4 @@ void ptp_convert_timestamp(struct skb_shared_hwtstamps *hwtstamps,
hwtstamps->hwtstamp = ns_to_ktime(ns);
}
EXPORT_SYMBOL(ptp_convert_timestamp);
#endif

1
drivers/scsi/cxgbi/cxgb4i/Kconfig
View File

@ -2,6 +2,7 @@
config SCSI_CXGB4_ISCSI
tristate "Chelsio T4 iSCSI support"
depends on PCI && INET && (IPV6 || IPV6=n)
depends on PTP_1588_CLOCK_OPTIONAL
depends on THERMAL || !THERMAL
depends on ETHERNET
depends on TLS || TLS=n

48
include/linux/ptp_clock_kernel.h
View File

@ -215,7 +215,7 @@ static inline long scaled_ppm_to_ppb(long ppm)
return (long)ppb;
}
#if IS_REACHABLE(CONFIG_PTP_1588_CLOCK)
#if IS_ENABLED(CONFIG_PTP_1588_CLOCK)
/**
* ptp_clock_register() - register a PTP hardware clock driver
@ -307,6 +307,33 @@ int ptp_schedule_worker(struct ptp_clock *ptp, unsigned long delay);
*/
void ptp_cancel_worker_sync(struct ptp_clock *ptp);
#else
static inline struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
struct device *parent)
{ return NULL; }
static inline int ptp_clock_unregister(struct ptp_clock *ptp)
{ return 0; }
static inline void ptp_clock_event(struct ptp_clock *ptp,
struct ptp_clock_event *event)
{ }
static inline int ptp_clock_index(struct ptp_clock *ptp)
{ return -1; }
static inline int ptp_find_pin(struct ptp_clock *ptp,
enum ptp_pin_function func, unsigned int chan)
{ return -1; }
static inline int ptp_schedule_worker(struct ptp_clock *ptp,
unsigned long delay)
{ return -EOPNOTSUPP; }
static inline void ptp_cancel_worker_sync(struct ptp_clock *ptp)
{ }
#endif
#if IS_BUILTIN(CONFIG_PTP_1588_CLOCK)
/*
* These are called by the network core, and don't work if PTP is in
* a loadable module.
*/
/**
* ptp_get_vclocks_index() - get all vclocks index on pclock, and
* caller is responsible to free memory
@ -327,26 +354,7 @@ int ptp_get_vclocks_index(int pclock_index, int **vclock_index);
*/
void ptp_convert_timestamp(struct skb_shared_hwtstamps *hwtstamps,
int vclock_index);
#else
static inline struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
struct device *parent)
{ return NULL; }
static inline int ptp_clock_unregister(struct ptp_clock *ptp)
{ return 0; }
static inline void ptp_clock_event(struct ptp_clock *ptp,
struct ptp_clock_event *event)
{ }
static inline int ptp_clock_index(struct ptp_clock *ptp)
{ return -1; }
static inline int ptp_find_pin(struct ptp_clock *ptp,
enum ptp_pin_function func, unsigned int chan)
{ return -1; }
static inline int ptp_schedule_worker(struct ptp_clock *ptp,
unsigned long delay)
{ return -EOPNOTSUPP; }
static inline void ptp_cancel_worker_sync(struct ptp_clock *ptp)
{ }
static inline int ptp_get_vclocks_index(int pclock_index, int **vclock_index)
{ return 0; }
static inline void ptp_convert_timestamp(struct skb_shared_hwtstamps *hwtstamps,