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2019-02-14bonding: check slave set command firstlyTonghao Zhang1-0/+2
This patch is a little improvement. If user use the command shown as below, we should print the info [1] instead of [2]. The eth0 exists actually, and it may confuse user. $ echo "eth0" > /sys/class/net/bond4/bonding/slaves [1] "bond4: no command found in slaves file - use +ifname or -ifname" [2] "write error: No such device" Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13mlxsw: core: Allow thermal zone binding to an external cooling deviceVadim Pasternak1-0/+12
Allow thermal zone binding to an external cooling device from the cooling devices white list. It provides support for Mellanox next generation systems on which cooling device logic is not controlled through the switch registers. Signed-off-by: Vadim Pasternak <vadimp@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13mlxsw: core: Add QSFP module temperature label attribute to hwmonVadim Pasternak1-0/+23
Add label attribute to hwmon object for exposing QSFP module's temperature sensor name. Modules are labeled as "front panel xxx". The label is used by utilities such as "sensors": front panel 001: +0.0C (crit = +0.0C, emerg = +0.0C) .. front panel 020: +31.0C (crit = +70.0C, emerg = +80.0C) .. front panel 056: +41.0C (crit = +70.0C, emerg = +80.0C) Signed-off-by: Vadim Pasternak <vadimp@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13mlxsw: core: Extend hwmon interface with QSFP module temperature attributesVadim Pasternak1-3/+215
Add new attributes to hwmon object for exposing QSFP module temperature input, fault indication, critical and emergency thresholds. Temperature input and fault indication are read from Management Temperature Bulk Register. Temperature thresholds are read from Management Cable Info Access Register. Signed-off-by: Vadim Pasternak <vadimp@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13mlxsw: core: Extend hwmon interface with fan fault attributeVadim Pasternak1-1/+33
Add new fan hwmon attribute for exposing fan faults (fault indication is read from Fan Out of Range Event Register). Signed-off-by: Vadim Pasternak <vadimp@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13mlxsw: core: Rename cooling deviceVadim Pasternak1-2/+3
Rename cooling device from "Fan" to "mlxsw_fan". Name "Fan" is too common name, and such name is misleading, while it's interpreted by user. For example name "Fan" could be used by ACPI. Signed-off-by: Vadim Pasternak <vadimp@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13mlxsw: core: Replace thermal temperature trips with definesVadim Pasternak1-6/+9
Replace thermal hardcoded temperature trip values with defines. Signed-off-by: Vadim Pasternak <vadimp@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13mlxsw: core: Modify thermal zone definitionVadim Pasternak1-9/+28
Modify thermal zone trip points setting for better alignment with system thermal requirement. Add hysteresis thresholds for thermal trips in order to avoid throttling around thermal trip point. If hysteresis temperature is not considered, PWM can have side effect of flip up/down on thermal trip point boundary. Signed-off-by: Vadim Pasternak <vadimp@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13mlxsw: core: Set different thermal polling time based on bus frequency ↵Vadim Pasternak3-2/+10
capability Add low frequency bus capability in order to allow core functionality separation based on bus type. Driver could run over PCIe, which is considered as high frequency bus or I2C, which is considered as low frequency bus. In the last case time setting, for example, for thermal polling interval, should be increased. Use different thermal monitoring based on bus type. For I2C bus time is set to 20 seconds, while for PCIe 1 second polling interval is used. Signed-off-by: Vadim Pasternak <vadimp@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13mlxsw: core: Add API for QSFP module temperature thresholds readingVadim Pasternak3-1/+128
Add new API to read QSFP module's temperature thresholds - warning and critical. New internal API reads the temperature thresholds from the modules, which are equipped with the thermal sensor. These thresholds will be exposed via hwmon subsystem. Signed-off-by: Vadim Pasternak <vadimp@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13mlxsw: reg: Add Fan Out of Range Event RegisterVadim Pasternak1-0/+30
Add FORE (Fan Out of Range Event Register), which is used for fan fault reading. Signed-off-by: Vadim Pasternak <vadimp@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13mlxsw: reg: Add Management Temperature Bulk RegisterVadim Pasternak1-0/+75
Add MTBR (Management Temperature Bulk Register), which is used for port temperature reading in a bulk mode. Signed-off-by: Vadim Pasternak <vadimp@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13mlxsw: spectrum: Move QSFP EEPROM definitions to common locationVadim Pasternak2-42/+52
Move QSFP EEPROM definitions to common location from the spectrum driver in order to make them available for other mlxsw modules. They are common for all kind of chips and have relation to SFF specifications 8024, 8436, 8472, 8636, rather than to chip type. Signed-off-by: Vadim Pasternak <vadimp@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13cxgb4vf: Few more link management changes.Vishal Kulkarni1-1/+8
CR4_QSFP 10G Speed technology should be 10000baseKR_Full And also report available FEC modes. Signed-off-by: Vishal Kulkarni <vishal@chelsio.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13qlge: fix some indentation issuesColin Ian King2-4/+4
There are some statements that are indented incorrectly. Fix these. Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13qed: fix indentation issue with statements in an if-blockColin Ian King1-6/+6
There are some statements in an if-block that are not correctly indented. Fix these. Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13net: ixp4xx_eth: replace dev_kfree_skb_irq by dev_consume_skb_irq for drop ↵Yang Wei1-1/+1
profiles dev_consume_skb_irq() should be called in eth_txdone_irq() when skb xmit done. It makes drop profiles(dropwatch, perf) more friendly. Signed-off-by: Yang Wei <yang.wei9@zte.com.cn> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13net: macb: replace dev_kfree_skb_irq by dev_consume_skb_irq for drop profilesYang Wei1-1/+1
dev_consume_skb_irq() should be called in at91ether_interrupt() when skb xmit done. It makes drop profiles(dropwatch, perf) more friendly. Signed-off-by: Yang Wei <yang.wei9@zte.com.cn> Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13net: sis: replace dev_kfree_skb_irq by dev_consume_skb_irq for drop profilesYang Wei2-2/+2
dev_consume_skb_irq() should be called when skb xmit done. It makes drop profiles(dropwatch, perf) more friendly. Signed-off-by: Yang Wei <yang.wei9@zte.com.cn> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13net: fealnx: replace dev_kfree_skb_irq by dev_consume_skb_irq for drop profilesYang Wei1-1/+1
dev_consume_skb_irq() should be called in intr_handler() when skb xmit done. It makes drop profiles(dropwatch, perf) more friendly. Signed-off-by: Yang Wei <yang.wei9@zte.com.cn> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13net: moxa: replace dev_kfree_skb_irq by dev_consume_skb_irq for drop profilesYang Wei1-1/+1
dev_consume_skb_irq() should be called in moxart_tx_finished() when skb xmit done. It makes drop profiles(dropwatch, perf) more friendly. Signed-off-by: Yang Wei <yang.wei9@zte.com.cn> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13net: apple: replace dev_kfree_skb_irq by dev_consume_skb_irq for drop profilesYang Wei1-1/+1
dev_consume_skb_irq() should be called in mace_interrupt() when skb xmit done. It makes drop profiles(dropwatch, perf) more friendly. Signed-off-by: Yang Wei <yang.wei9@zte.com.cn> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13net: atheros: replace dev_kfree_skb_irq by dev_consume_skb_irq for drop profilesYang Wei2-2/+2
dev_consume_skb_irq() should be called when skb xmit done. It makes drop profiles(dropwatch, perf) more friendly. Signed-off-by: Yang Wei <yang.wei9@zte.com.cn> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13net: qualcomm: emac: replace dev_kfree_skb_irq by dev_consume_skb_irq for ↵Yang Wei1-1/+1
drop profiles dev_consume_skb_irq() should be called in emac_mac_tx_process() when skb xmit done. It makes drop profiles(dropwatch, perf) more friendly. Signed-off-by: Yang Wei <yang.wei9@zte.com.cn> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13net: neterion: replace dev_kfree_skb_irq by dev_consume_skb_irq for drop ↵Yang Wei2-2/+2
profiles dev_consume_skb_irq() should be called when skb xmit done. It makes drop profiles(dropwatch, perf) more friendly. Signed-off-by: Yang Wei <yang.wei9@zte.com.cn> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13net: phy: Add generic support for 2.5GBaseT and 5GBaseTMaxime Chevallier1-0/+37
The 802.3bz specification, based on previous by the NBASET alliance, defines the 2.5GBaseT and 5GBaseT link modes for ethernet traffic on cat5e, cat6 and cat7 cables. These mode integrate with the already defined C45 MDIO PMA/PMD registers set that added 10G support, by defining some previously reserved bits, and adding a new register (2.5G/5G Extended abilities). This commit adds the required definitions in include/uapi/linux/mdio.h to support these modes, and detect when a link-partner advertises them. It also adds support for these mode in the generic C45 PHY infrastructure. Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Reviewed-by: Heiner Kallweit <hkallweit1@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13net: phy: Extract genphy_c45_pma_read_abilities from marvell10gMaxime Chevallier2-70/+82
Marvell 10G PHY driver has a generic way of initializing the supported link modes by reading the PHY's C45 PMA abilities. This can be made generic, since these registers are part of the 802.3 specifications. This commit extracts the config_init link_mode initialization code from marvell10g and uses it to introduce the genphy_c45_pma_read_abilities function. Only PMA modes are read, it's still up to the caller to set the Pause parameters. Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13net: phy: Move of_set_phy_eee_broken to phy-core.cMaxime Chevallier2-28/+27
Since of_set_phy_supported was moved to phy-core.c, we can also move of_set_phy_eee_broken to the same location, so that we have all OF functions in the same place. This patch doesn't intend to introduce any change in behaviour. Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-13net: phy: Mask-out non-compatible modes when setting the max-speedMaxime Chevallier2-53/+45
When setting a PHY's max speed using either the max-speed DT property or ethtool, we should mask-out all non-compatible modes according to the settings table, instead of just the 10/100BASET modes. Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Suggested-by: Russell King <rmk+kernel@armlinux.org.uk> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12mlxsw: spectrum_switchdev: Remove unused variablesFlorian Fainelli1-3/+0
After 1ecb195753a1 ("mlxsw: spectrum_switchdev: Remove getting PORT_BRIDGE_FLAGS") we are not accessing any driver private data structure, so the mlxsw_sp_port and mlxsw_sp variables are unused. Fixes: 1ecb195753a1 ("mlxsw: spectrum_switchdev: Remove getting PORT_BRIDGE_FLAGS") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12rocker: Remove port_attr_bridge_flags_get assignmentFlorian Fainelli1-1/+0
After 610d2b601bba ("rocker: Remove getting PORT_BRIDGE_FLAGS") we no longer have a port_attr_bridge_flags_get member in the rocker_world_ops structre, fix that. Fixes: 610d2b601bba ("rocker: Remove getting PORT_BRIDGE_FLAGS") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12net/mlx4_en: Force CHECKSUM_NONE for short ethernet framesSaeed Mahameed1-2/+20
When an ethernet frame is padded to meet the minimum ethernet frame size, the padding octets are not covered by the hardware checksum. Fortunately the padding octets are usually zero's, which don't affect checksum. However, it is not guaranteed. For example, switches might choose to make other use of these octets. This repeatedly causes kernel hardware checksum fault. Prior to the cited commit below, skb checksum was forced to be CHECKSUM_NONE when padding is detected. After it, we need to keep skb->csum updated. However, fixing up CHECKSUM_COMPLETE requires to verify and parse IP headers, it does not worth the effort as the packets are so small that CHECKSUM_COMPLETE has no significant advantage. Future work: when reporting checksum complete is not an option for IP non-TCP/UDP packets, we can actually fallback to report checksum unnecessary, by looking at cqe IPOK bit. Fixes: 88078d98d1bb ("net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends") Cc: Eric Dumazet <edumazet@google.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: Tariq Toukan <tariqt@mellanox.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12enetc: add PTP clock driverYangbo Lu4-2/+162
This patch is to add PTP clock driver for ENETC. The driver reused QorIQ PTP clock driver. Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12ptp_qoriq: make structure/function names more consistentYangbo Lu2-2/+2
Strings containing "ptp_qoriq" or "qoriq_ptp" which were used for structure/function names were complained by users. Let's just use the unique "ptp_qoriq" to make these names more consistent. This patch is just to unify the names using "ptp_qoriq". It hasn't changed any functions. Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12rocker: Remove getting PORT_BRIDGE_FLAGSFlorian Fainelli3-27/+0
There is no code that attempts to get the SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS attribute, remove support for that. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12mlxsw: spectrum_switchdev: Remove getting PORT_BRIDGE_FLAGSFlorian Fainelli1-17/+0
There is no code that will query the SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS attribute remove support for that. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Reviewed-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12net: phy: simplify genphy_config_eee_advertHeiner Kallweit1-21/+6
Use new function phy_modify_mmd_changed(), the result speaks for itself. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12net: marvell: mvpp2: use mvpp2_is_xlg() helper elsewhereRussell King1-9/+6
There are several places which make the decision whether to access the XLGMAC vs GMAC that only check for PHY_INTERFACE_MODE_10GKR and not its XAUI variant. Switch these to use the new helper so that we have consistency through the driver. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12net: marvell: mvpp2: add mvpp2_is_xlg() helperRussell King1-11/+9
Add a mvpp2_is_xlg() helper to identify whether the interface mode should be using the XLGMAC rather than the GMAC. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12net: phylink: add phylink_init_eee() helperRussell King1-0/+18
Provide phylink_init_eee() to allow MAC drivers to initialise PHY EEE from within the ethtool set_eee() method. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12net: phylink: only call mac_config() during resolve when link is upRussell King1-2/+9
There's little point calling mac_config() when the link is down. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12Revert "devlink: Add a generic wake_on_lan port parameter"Vasundhara Volam2-19/+1
This reverts commit b639583f9e36d044ac1b13090ae812266992cbac. As per discussion with Jakub Kicinski and Michal Kubecek, this will be better addressed by soon-too-come ethtool netlink API with additional indication that given configuration request is supposed to be persisted. Also, remove the parameter support from bnxt_en driver. Cc: Jiri Pirko <jiri@mellanox.com> Cc: Michael Chan <michael.chan@broadcom.com> Cc: Michal Kubecek <mkubecek@suse.cz> Suggested-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12smc911x: pass struct device to DMA API functionsChristoph Hellwig1-2/+2
The DMA API generally relies on a struct device to work properly, and only barely works without one for legacy reasons. Pass the easily available struct device from the platform_device to remedy this. Note that smc911x apparently is a PIO chip with an external DMA handshake, and we probably use the wrong device here. But at least it matches the mapping side, which apparently works or at least worked in the not too distant past. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12meth: pass struct device to DMA API functionsChristoph Hellwig1-10/+15
The DMA API generally relies on a struct device to work properly, and only barely works without one for legacy reasons. Pass the easily available struct device from the platform_device to remedy this. Also use GFP_KERNEL instead of GFP_ATOMIC as the gfp_t for the memory allocation, as we aren't in interrupt context or under a lock. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12moxart_ether: pass struct device to DMA API functionsChristoph Hellwig2-4/+8
The DMA API generally relies on a struct device to work properly, and only barely works without one for legacy reasons. Pass the easily available struct device from the platform_device to remedy this. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12pxa168_eth: pass struct device to DMA API functionsChristoph Hellwig1-4/+7
The DMA API generally relies on a struct device to work properly, and only barely works without one for legacy reasons. Pass the easily available struct device from the platform_device to remedy this. Note that this driver seems to entirely lack dma_map_single error handling, but that is left for another time. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12lantiq_etop: pass struct device to DMA API functionsChristoph Hellwig1-2/+4
The DMA API generally relies on a struct device to work properly, and only barely works without one for legacy reasons. Pass the easily available struct device from the platform_device to remedy this. Note this driver seems to lack dma_unmap_* calls entirely, but fixing that is left for another time. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12macb_main: pass struct device to DMA API functionsChristoph Hellwig1-4/+4
The DMA API generally relies on a struct device to work properly, and only barely works without one for legacy reasons. Pass the easily available struct device from the platform_device to remedy this. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12au1000_eth: pass struct device to DMA API functionsChristoph Hellwig1-3/+3
The DMA API generally relies on a struct device to work properly, and only barely works without one for legacy reasons. Pass the easily available struct device from the platform_device to remedy this. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12net: caif: pass struct device to DMA API functionsChristoph Hellwig1-14/+16
The DMA API generally relies on a struct device to work properly, and only barely works without one for legacy reasons. Pass the easily available struct device from the platform_device to remedy this. Also use the proper Kconfig symbol to check for DMA API availability. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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