diff options
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/conf.py | 10 | ||||
| -rw-r--r-- | Documentation/networking/dns_resolver.txt | 2 | ||||
| -rw-r--r-- | Documentation/networking/dpaa.txt | 194 | ||||
| -rw-r--r-- | Documentation/networking/index.rst | 18 | ||||
| -rw-r--r-- | Documentation/networking/kapi.rst | 147 | ||||
| -rw-r--r-- | Documentation/networking/scaling.txt | 2 | ||||
| -rw-r--r-- | Documentation/networking/tcp.txt | 31 | ||||
| -rw-r--r-- | Documentation/networking/z8530book.rst | 256 |
8 files changed, 640 insertions, 20 deletions
diff --git a/Documentation/networking/conf.py b/Documentation/networking/conf.py new file mode 100644 index 000000000000..40f69e67a883 --- /dev/null +++ b/Documentation/networking/conf.py @@ -0,0 +1,10 @@ +# -*- coding: utf-8; mode: python -*- + +project = "Linux Networking Documentation" + +tags.add("subproject") + +latex_documents = [ + ('index', 'networking.tex', project, + 'The kernel development community', 'manual'), +] diff --git a/Documentation/networking/dns_resolver.txt b/Documentation/networking/dns_resolver.txt index d86adcdae420..eaa8f9a6fd5d 100644 --- a/Documentation/networking/dns_resolver.txt +++ b/Documentation/networking/dns_resolver.txt @@ -143,7 +143,7 @@ the key will be discarded and recreated when the data it holds has expired. dns_query() returns a copy of the value attached to the key, or an error if that is indicated instead. -See <file:Documentation/security/keys-request-key.txt> for further +See <file:Documentation/security/keys/request-key.rst> for further information about request-key function. diff --git a/Documentation/networking/dpaa.txt b/Documentation/networking/dpaa.txt new file mode 100644 index 000000000000..76e016d4d344 --- /dev/null +++ b/Documentation/networking/dpaa.txt @@ -0,0 +1,194 @@ +The QorIQ DPAA Ethernet Driver +============================== + +Authors: +Madalin Bucur <madalin.bucur@nxp.com> +Camelia Groza <camelia.groza@nxp.com> + +Contents +======== + + - DPAA Ethernet Overview + - DPAA Ethernet Supported SoCs + - Configuring DPAA Ethernet in your kernel + - DPAA Ethernet Frame Processing + - DPAA Ethernet Features + - Debugging + +DPAA Ethernet Overview +====================== + +DPAA stands for Data Path Acceleration Architecture and it is a +set of networking acceleration IPs that are available on several +generations of SoCs, both on PowerPC and ARM64. + +The Freescale DPAA architecture consists of a series of hardware blocks +that support Ethernet connectivity. The Ethernet driver depends upon the +following drivers in the Linux kernel: + + - Peripheral Access Memory Unit (PAMU) (* needed only for PPC platforms) + drivers/iommu/fsl_* + - Frame Manager (FMan) + drivers/net/ethernet/freescale/fman + - Queue Manager (QMan), Buffer Manager (BMan) + drivers/soc/fsl/qbman + +A simplified view of the dpaa_eth interfaces mapped to FMan MACs: + + dpaa_eth /eth0\ ... /ethN\ + driver | | | | + ------------- ---- ----------- ---- ------------- + -Ports / Tx Rx \ ... / Tx Rx \ + FMan | | | | + -MACs | MAC0 | | MACN | + / dtsec0 \ ... / dtsecN \ (or tgec) + / \ / \(or memac) + --------- -------------- --- -------------- --------- + FMan, FMan Port, FMan SP, FMan MURAM drivers + --------------------------------------------------------- + FMan HW blocks: MURAM, MACs, Ports, SP + --------------------------------------------------------- + +The dpaa_eth relation to the QMan, BMan and FMan: + ________________________________ + dpaa_eth / eth0 \ + driver / \ + --------- -^- -^- -^- --- --------- + QMan driver / \ / \ / \ \ / | BMan | + |Rx | |Rx | |Tx | |Tx | | driver | + --------- |Dfl| |Err| |Cnf| |FQs| | | + QMan HW |FQ | |FQ | |FQs| | | | | + / \ / \ / \ \ / | | + --------- --- --- --- -v- --------- + | FMan QMI | | + | FMan HW FMan BMI | BMan HW | + ----------------------- -------- + +where the acronyms used above (and in the code) are: +DPAA = Data Path Acceleration Architecture +FMan = DPAA Frame Manager +QMan = DPAA Queue Manager +BMan = DPAA Buffers Manager +QMI = QMan interface in FMan +BMI = BMan interface in FMan +FMan SP = FMan Storage Profiles +MURAM = Multi-user RAM in FMan +FQ = QMan Frame Queue +Rx Dfl FQ = default reception FQ +Rx Err FQ = Rx error frames FQ +Tx Cnf FQ = Tx confirmation FQs +Tx FQs = transmission frame queues +dtsec = datapath three speed Ethernet controller (10/100/1000 Mbps) +tgec = ten gigabit Ethernet controller (10 Gbps) +memac = multirate Ethernet MAC (10/100/1000/10000) + +DPAA Ethernet Supported SoCs +============================ + +The DPAA drivers enable the Ethernet controllers present on the following SoCs: + +# PPC +P1023 +P2041 +P3041 +P4080 +P5020 +P5040 +T1023 +T1024 +T1040 +T1042 +T2080 +T4240 +B4860 + +# ARM +LS1043A +LS1046A + +Configuring DPAA Ethernet in your kernel +======================================== + +To enable the DPAA Ethernet driver, the following Kconfig options are required: + +# common for arch/arm64 and arch/powerpc platforms +CONFIG_FSL_DPAA=y +CONFIG_FSL_FMAN=y +CONFIG_FSL_DPAA_ETH=y +CONFIG_FSL_XGMAC_MDIO=y + +# for arch/powerpc only +CONFIG_FSL_PAMU=y + +# common options needed for the PHYs used on the RDBs +CONFIG_VITESSE_PHY=y +CONFIG_REALTEK_PHY=y +CONFIG_AQUANTIA_PHY=y + +DPAA Ethernet Frame Processing +============================== + +On Rx, buffers for the incoming frames are retrieved from one of the three +existing buffers pools. The driver initializes and seeds these, each with +buffers of different sizes: 1KB, 2KB and 4KB. + +On Tx, all transmitted frames are returned to the driver through Tx +confirmation frame queues. The driver is then responsible for freeing the +buffers. In order to do this properly, a backpointer is added to the buffer +before transmission that points to the skb. When the buffer returns to the +driver on a confirmation FQ, the skb can be correctly consumed. + +DPAA Ethernet Features +====================== + +Currently the DPAA Ethernet driver enables the basic features required for +a Linux Ethernet driver. The support for advanced features will be added +gradually. + +The driver has Rx and Tx checksum offloading for UDP and TCP. Currently the Rx +checksum offload feature is enabled by default and cannot be controlled through +ethtool. + +The driver has support for multiple prioritized Tx traffic classes. Priorities +range from 0 (lowest) to 3 (highest). These are mapped to HW workqueues with +strict priority levels. Each traffic class contains NR_CPU TX queues. By +default, only one traffic class is enabled and the lowest priority Tx queues +are used. Higher priority traffic classes can be enabled with the mqprio +qdisc. For example, all four traffic classes are enabled on an interface with +the following command. Furthermore, skb priority levels are mapped to traffic +classes as follows: + + * priorities 0 to 3 - traffic class 0 (low priority) + * priorities 4 to 7 - traffic class 1 (medium-low priority) + * priorities 8 to 11 - traffic class 2 (medium-high priority) + * priorities 12 to 15 - traffic class 3 (high priority) + +tc qdisc add dev <int> root handle 1: \ + mqprio num_tc 4 map 0 0 0 0 1 1 1 1 2 2 2 2 3 3 3 3 hw 1 + +Debugging +========= + +The following statistics are exported for each interface through ethtool: + + - interrupt count per CPU + - Rx packets count per CPU + - Tx packets count per CPU + - Tx confirmed packets count per CPU + - Tx S/G frames count per CPU + - Tx error count per CPU + - Rx error count per CPU + - Rx error count per type + - congestion related statistics: + - congestion status + - time spent in congestion + - number of time the device entered congestion + - dropped packets count per cause + +The driver also exports the following information in sysfs: + + - the FQ IDs for each FQ type + /sys/devices/platform/dpaa-ethernet.0/net/<int>/fqids + + - the IDs of the buffer pools in use + /sys/devices/platform/dpaa-ethernet.0/net/<int>/bpids diff --git a/Documentation/networking/index.rst b/Documentation/networking/index.rst new file mode 100644 index 000000000000..b5bd87e01f52 --- /dev/null +++ b/Documentation/networking/index.rst @@ -0,0 +1,18 @@ +Linux Networking Documentation +============================== + +Contents: + +.. toctree:: + :maxdepth: 2 + + kapi + z8530book + +.. only:: subproject + + Indices + ======= + + * :ref:`genindex` + diff --git a/Documentation/networking/kapi.rst b/Documentation/networking/kapi.rst new file mode 100644 index 000000000000..580289f345da --- /dev/null +++ b/Documentation/networking/kapi.rst @@ -0,0 +1,147 @@ +========================================= +Linux Networking and Network Devices APIs +========================================= + +Linux Networking +================ + +Networking Base Types +--------------------- + +.. kernel-doc:: include/linux/net.h + :internal: + +Socket Buffer Functions +----------------------- + +.. kernel-doc:: include/linux/skbuff.h + :internal: + +.. kernel-doc:: include/net/sock.h + :internal: + +.. kernel-doc:: net/socket.c + :export: + +.. kernel-doc:: net/core/skbuff.c + :export: + +.. kernel-doc:: net/core/sock.c + :export: + +.. kernel-doc:: net/core/datagram.c + :export: + +.. kernel-doc:: net/core/stream.c + :export: + +Socket Filter +------------- + +.. kernel-doc:: net/core/filter.c + :export: + +Generic Network Statistics +-------------------------- + +.. kernel-doc:: include/uapi/linux/gen_stats.h + :internal: + +.. kernel-doc:: net/core/gen_stats.c + :export: + +.. kernel-doc:: net/core/gen_estimator.c + :export: + +SUN RPC subsystem +----------------- + +.. kernel-doc:: net/sunrpc/xdr.c + :export: + +.. kernel-doc:: net/sunrpc/svc_xprt.c + :export: + +.. kernel-doc:: net/sunrpc/xprt.c + :export: + +.. kernel-doc:: net/sunrpc/sched.c + :export: + +.. kernel-doc:: net/sunrpc/socklib.c + :export: + +.. kernel-doc:: net/sunrpc/stats.c + :export: + +.. kernel-doc:: net/sunrpc/rpc_pipe.c + :export: + +.. kernel-doc:: net/sunrpc/rpcb_clnt.c + :export: + +.. kernel-doc:: net/sunrpc/clnt.c + :export: + +WiMAX +----- + +.. kernel-doc:: net/wimax/op-msg.c + :export: + +.. kernel-doc:: net/wimax/op-reset.c + :export: + +.. kernel-doc:: net/wimax/op-rfkill.c + :export: + +.. kernel-doc:: net/wimax/stack.c + :export: + +.. kernel-doc:: include/net/wimax.h + :internal: + +.. kernel-doc:: include/uapi/linux/wimax.h + :internal: + +Network device support +====================== + +Driver Support +-------------- + +.. kernel-doc:: net/core/dev.c + :export: + +.. kernel-doc:: net/ethernet/eth.c + :export: + +.. kernel-doc:: net/sched/sch_generic.c + :export: + +.. kernel-doc:: include/linux/etherdevice.h + :internal: + +.. kernel-doc:: include/linux/netdevice.h + :internal: + +PHY Support +----------- + +.. kernel-doc:: drivers/net/phy/phy.c + :export: + +.. kernel-doc:: drivers/net/phy/phy.c + :internal: + +.. kernel-doc:: drivers/net/phy/phy_device.c + :export: + +.. kernel-doc:: drivers/net/phy/phy_device.c + :internal: + +.. kernel-doc:: drivers/net/phy/mdio_bus.c + :export: + +.. kernel-doc:: drivers/net/phy/mdio_bus.c + :internal: diff --git a/Documentation/networking/scaling.txt b/Documentation/networking/scaling.txt index 59f4db2a0c85..f55639d71d35 100644 --- a/Documentation/networking/scaling.txt +++ b/Documentation/networking/scaling.txt @@ -122,7 +122,7 @@ associated flow of the packet. The hash is either provided by hardware or will be computed in the stack. Capable hardware can pass the hash in the receive descriptor for the packet; this would usually be the same hash used for RSS (e.g. computed Toeplitz hash). The hash is saved in -skb->rx_hash and can be used elsewhere in the stack as a hash of the +skb->hash and can be used elsewhere in the stack as a hash of the packet’s flow. Each receive hardware queue has an associated list of CPUs to which diff --git a/Documentation/networking/tcp.txt b/Documentation/networking/tcp.txt index bdc4c0db51e1..9c7139d57e57 100644 --- a/Documentation/networking/tcp.txt +++ b/Documentation/networking/tcp.txt @@ -1,7 +1,7 @@ TCP protocol ============ -Last updated: 9 February 2008 +Last updated: 3 June 2017 Contents ======== @@ -29,18 +29,19 @@ As of 2.6.13, Linux supports pluggable congestion control algorithms. A congestion control mechanism can be registered through functions in tcp_cong.c. The functions used by the congestion control mechanism are registered via passing a tcp_congestion_ops struct to -tcp_register_congestion_control. As a minimum name, ssthresh, -cong_avoid must be valid. +tcp_register_congestion_control. As a minimum, the congestion control +mechanism must provide a valid name and must implement either ssthresh, +cong_avoid and undo_cwnd hooks or the "omnipotent" cong_control hook. Private data for a congestion control mechanism is stored in tp->ca_priv. tcp_ca(tp) returns a pointer to this space. This is preallocated space - it is important to check the size of your private data will fit this space, or -alternatively space could be allocated elsewhere and a pointer to it could +alternatively, space could be allocated elsewhere and a pointer to it could be stored here. There are three kinds of congestion control algorithms currently: The simplest ones are derived from TCP reno (highspeed, scalable) and just -provide an alternative the congestion window calculation. More complex +provide an alternative congestion window calculation. More complex ones like BIC try to look at other events to provide better heuristics. There are also round trip time based algorithms like Vegas and Westwood+. @@ -49,21 +50,15 @@ Good TCP congestion control is a complex problem because the algorithm needs to maintain fairness and performance. Please review current research and RFC's before developing new modules. -The method that is used to determine which congestion control mechanism is -determined by the setting of the sysctl net.ipv4.tcp_congestion_control. -The default congestion control will be the last one registered (LIFO); -so if you built everything as modules, the default will be reno. If you -build with the defaults from Kconfig, then CUBIC will be builtin (not a -module) and it will end up the default. +The default congestion control mechanism is chosen based on the +DEFAULT_TCP_CONG Kconfig parameter. If you really want a particular default +value then you can set it using sysctl net.ipv4.tcp_congestion_control. The +module will be autoloaded if needed and you will get the expected protocol. If +you ask for an unknown congestion method, then the sysctl attempt will fail. -If you really want a particular default value then you will need -to set it with the sysctl. If you use a sysctl, the module will be autoloaded -if needed and you will get the expected protocol. If you ask for an -unknown congestion method, then the sysctl attempt will fail. - -If you remove a tcp congestion control module, then you will get the next +If you remove a TCP congestion control module, then you will get the next available one. Since reno cannot be built as a module, and cannot be -deleted, it will always be available. +removed, it will always be available. How the new TCP output machine [nyi] works. =========================================== diff --git a/Documentation/networking/z8530book.rst b/Documentation/networking/z8530book.rst new file mode 100644 index 000000000000..fea2c40e7973 --- /dev/null +++ b/Documentation/networking/z8530book.rst @@ -0,0 +1,256 @@ +======================= +Z8530 Programming Guide +======================= + +:Author: Alan Cox + +Introduction +============ + +The Z85x30 family synchronous/asynchronous controller chips are used on +a large number of cheap network interface cards. The kernel provides a +core interface layer that is designed to make it easy to provide WAN +services using this chip. + +The current driver only support synchronous operation. Merging the +asynchronous driver support into this code to allow any Z85x30 device to +be used as both a tty interface and as a synchronous controller is a +project for Linux post the 2.4 release + +Driver Modes +============ + +The Z85230 driver layer can drive Z8530, Z85C30 and Z85230 devices in +three different modes. Each mode can be applied to an individual channel +on the chip (each chip has two channels). + +The PIO synchronous mode supports the most common Z8530 wiring. Here the +chip is interface to the I/O and interrupt facilities of the host +machine but not to the DMA subsystem. When running PIO the Z8530 has +extremely tight timing requirements. Doing high speeds, even with a +Z85230 will be tricky. Typically you should expect to achieve at best +9600 baud with a Z8C530 and 64Kbits with a Z85230. + +The DMA mode supports the chip when it is configured to use dual DMA +channels on an ISA bus. The better cards tend to support this mode of +operation for a single channel. With DMA running the Z85230 tops out +when it starts to hit ISA DMA constraints at about 512Kbits. It is worth +noting here that many PC machines hang or crash when the chip is driven +fast enough to hold the ISA bus solid. + +Transmit DMA mode uses a single DMA channel. The DMA channel is used for +transmission as the transmit FIFO is smaller than the receive FIFO. it +gives better performance than pure PIO mode but is nowhere near as ideal +as pure DMA mode. + +Using the Z85230 driver +======================= + +The Z85230 driver provides the back end interface to your board. To +configure a Z8530 interface you need to detect the board and to identify +its ports and interrupt resources. It is also your problem to verify the +resources are available. + +Having identified the chip you need to fill in a struct z8530_dev, +which describes each chip. This object must exist until you finally +shutdown the board. Firstly zero the active field. This ensures nothing +goes off without you intending it. The irq field should be set to the +interrupt number of the chip. (Each chip has a single interrupt source +rather than each channel). You are responsible for allocating the +interrupt line. The interrupt handler should be set to +:c:func:`z8530_interrupt()`. The device id should be set to the +z8530_dev structure pointer. Whether the interrupt can be shared or not +is board dependent, and up to you to initialise. + +The structure holds two channel structures. Initialise chanA.ctrlio and +chanA.dataio with the address of the control and data ports. You can or +this with Z8530_PORT_SLEEP to indicate your interface needs the 5uS +delay for chip settling done in software. The PORT_SLEEP option is +architecture specific. Other flags may become available on future +platforms, eg for MMIO. Initialise the chanA.irqs to &z8530_nop to +start the chip up as disabled and discarding interrupt events. This +ensures that stray interrupts will be mopped up and not hang the bus. +Set chanA.dev to point to the device structure itself. The private and +name field you may use as you wish. The private field is unused by the +Z85230 layer. The name is used for error reporting and it may thus make +sense to make it match the network name. + +Repeat the same operation with the B channel if your chip has both +channels wired to something useful. This isn't always the case. If it is +not wired then the I/O values do not matter, but you must initialise +chanB.dev. + +If your board has DMA facilities then initialise the txdma and rxdma +fields for the relevant channels. You must also allocate the ISA DMA +channels and do any necessary board level initialisation to configure +them. The low level driver will do the Z8530 and DMA controller +programming but not board specific magic. + +Having initialised the device you can then call +:c:func:`z8530_init()`. This will probe the chip and reset it into +a known state. An identification sequence is then run to identify the +chip type. If the checks fail to pass the function returns a non zero +error code. Typically this indicates that the port given is not valid. +After this call the type field of the z8530_dev structure is +initialised to either Z8530, Z85C30 or Z85230 according to the chip +found. + +Once you have called z8530_init you can also make use of the utility +function :c:func:`z8530_describe()`. This provides a consistent +reporting format for the Z8530 devices, and allows all the drivers to +provide consistent reporting. + +Attaching Network Interfaces +============================ + +If you wish to use the network interface facilities of the driver, then +you need to attach a network device to each channel that is present and +in use. In addition to use the generic HDLC you need to follow some +additional plumbing rules. They may seem complex but a look at the +example hostess_sv11 driver should reassure you. + +The network device used for each channel should be pointed to by the +netdevice field of each channel. The hdlc-> priv field of the network +device points to your private data - you will need to be able to find +your private data from this. + +The way most drivers approach this particular problem is to create a +structure holding the Z8530 device definition and put that into the +private field of the network device. The network device fields of the +channels then point back to the network devices. + +If you wish to use the generic HDLC then you need to register the HDLC +device. + +Before you register your network device you will also need to provide +suitable handlers for most of the network device callbacks. See the +network device documentation for more details on this. + +Configuring And Activating The Port +=================================== + +The Z85230 driver provides helper functions and tables to load the port +registers on the Z8530 chips. When programming the register settings for +a channel be aware that the documentation recommends initialisation +orders. Strange things happen when these are not followed. + +:c:func:`z8530_channel_load()` takes an array of pairs of +initialisation values in an array of u8 type. The first value is the +Z8530 register number. Add 16 to indicate the alternate register bank on +the later chips. The array is terminated by a 255. + +The driver provides a pair of public tables. The z8530_hdlc_kilostream +table is for the UK 'Kilostream' service and also happens to cover most +other end host configurations. The z8530_hdlc_kilostream_85230 table +is the same configuration using the enhancements of the 85230 chip. The +configuration loaded is standard NRZ encoded synchronous data with HDLC +bitstuffing. All of the timing is taken from the other end of the link. + +When writing your own tables be aware that the driver internally tracks +register values. It may need to reload values. You should therefore be +sure to set registers 1-7, 9-11, 14 and 15 in all configurations. Where +the register settings depend on DMA selection the driver will update the +bits itself when you open or close. Loading a new table with the +interface open is not recommended. + +There are three standard configurations supported by the core code. In +PIO mode the interface is programmed up to use interrupt driven PIO. +This places high demands on the host processor to avoid latency. The +driver is written to take account of latency issues but it cannot avoid +latencies caused by other drivers, notably IDE in PIO mode. Because the +drivers allocate buffers you must also prevent MTU changes while the +port is open. + +Once the port is open it will call the rx_function of each channel +whenever a completed packet arrived. This is invoked from interrupt +context and passes you the channel and a network buffer (struct +sk_buff) holding the data. The data includes the CRC bytes so most +users will want to trim the last two bytes before processing the data. +This function is very timing critical. When you wish to simply discard +data the support code provides the function +:c:func:`z8530_null_rx()` to discard the data. + +To active PIO mode sending and receiving the ``z8530_sync_open`` is called. +This expects to be passed the network device and the channel. Typically +this is called from your network device open callback. On a failure a +non zero error status is returned. +The :c:func:`z8530_sync_close()` function shuts down a PIO +channel. This must be done before the channel is opened again and before +the driver shuts down and unloads. + +The ideal mode of operation is dual channel DMA mode. Here the kernel +driver will configure the board for DMA in both directions. The driver +also handles ISA DMA issues such as controller programming and the +memory range limit for you. This mode is activated by calling the +:c:func:`z8530_sync_dma_open()` function. On failure a non zero +error value is returned. Once this mode is activated it can be shut down +by calling the :c:func:`z8530_sync_dma_close()`. You must call +the close function matching the open mode you used. + +The final supported mode uses a single DMA channel to drive the transmit +side. As the Z85C30 has a larger FIFO on the receive channel this tends +to increase the maximum speed a little. This is activated by calling the +``z8530_sync_txdma_open``. This returns a non zero error code on failure. The +:c:func:`z8530_sync_txdma_close()` function closes down the Z8530 +interface from this mode. + +Network Layer Functions +======================= + +The Z8530 layer provides functions to queue packets for transmission. +The driver internally buffers the frame currently being transmitted and +one further frame (in order to keep back to back transmission running). +Any further buffering is up to the caller. + +The function :c:func:`z8530_queue_xmit()` takes a network buffer +in sk_buff format and queues it for transmission. The caller must +provide the entire packet with the exception of the bitstuffing and CRC. +This is normally done by the caller via the generic HDLC interface +layer. It returns 0 if the buffer has been queued and non zero values +for queue full. If the function accepts the buffer it becomes property +of the Z8530 layer and the caller should not free it. + +The function :c:func:`z8530_get_stats()` returns a pointer to an +internally maintained per interface statistics block. This provides most +of the interface code needed to implement the network layer get_stats +callback. + +Porting The Z8530 Driver +======================== + +The Z8530 driver is written to be portable. In DMA mode it makes +assumptions about the use of ISA DMA. These are probably warranted in +most cases as the Z85230 in particular was designed to glue to PC type +machines. The PIO mode makes no real assumptions. + +Should you need to retarget the Z8530 driver to another architecture the +only code that should need changing are the port I/O functions. At the +moment these assume PC I/O port accesses. This may not be appropriate +for all platforms. Replacing :c:func:`z8530_read_port()` and +``z8530_write_port`` is intended to be all that is required to port +this driver layer. + +Known Bugs And Assumptions +========================== + +Interrupt Locking + The locking in the driver is done via the global cli/sti lock. This + makes for relatively poor SMP performance. Switching this to use a + per device spin lock would probably materially improve performance. + +Occasional Failures + We have reports of occasional failures when run for very long + periods of time and the driver starts to receive junk frames. At the + moment the cause of this is not clear. + +Public Functions Provided +========================= + +.. kernel-doc:: drivers/net/wan/z85230.c + :export: + +Internal Functions +================== + +.. kernel-doc:: drivers/net/wan/z85230.c + :internal: |
