264 lines
12 KiB
Plaintext
264 lines
12 KiB
Plaintext
Altera Triple-Speed Ethernet MAC driver
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Copyright (C) 2008-2014 Altera Corporation
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This is the driver for the Altera Triple-Speed Ethernet (TSE) controllers
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using the SGDMA and MSGDMA soft DMA IP components. The driver uses the
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platform bus to obtain component resources. The designs used to test this
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driver were built for a Cyclone(R) V SOC FPGA board, a Cyclone(R) V FPGA board,
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and tested with ARM and NIOS processor hosts seperately. The anticipated use
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cases are simple communications between an embedded system and an external peer
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for status and simple configuration of the embedded system.
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For more information visit www.altera.com and www.rocketboards.org. Support
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forums for the driver may be found on www.rocketboards.org, and a design used
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to test this driver may be found there as well. Support is also available from
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the maintainer of this driver, found in MAINTAINERS.
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The Triple-Speed Ethernet, SGDMA, and MSGDMA components are all soft IP
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components that can be assembled and built into an FPGA using the Altera
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Quartus toolchain. Quartus 13.1 and 14.0 were used to build the design that
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this driver was tested against. The sopc2dts tool is used to create the
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device tree for the driver, and may be found at rocketboards.org.
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The driver probe function examines the device tree and determines if the
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Triple-Speed Ethernet instance is using an SGDMA or MSGDMA component. The
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probe function then installs the appropriate set of DMA routines to
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initialize, setup transmits, receives, and interrupt handling primitives for
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the respective configurations.
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The SGDMA component is to be deprecated in the near future (over the next 1-2
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years as of this writing in early 2014) in favor of the MSGDMA component.
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SGDMA support is included for existing designs and reference in case a
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developer wishes to support their own soft DMA logic and driver support. Any
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new designs should not use the SGDMA.
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The SGDMA supports only a single transmit or receive operation at a time, and
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therefore will not perform as well compared to the MSGDMA soft IP. Please
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visit www.altera.com for known, documented SGDMA errata.
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Scatter-gather DMA is not supported by the SGDMA or MSGDMA at this time.
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Scatter-gather DMA will be added to a future maintenance update to this
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driver.
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Jumbo frames are not supported at this time.
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The driver limits PHY operations to 10/100Mbps, and has not yet been fully
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tested for 1Gbps. This support will be added in a future maintenance update.
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1) Kernel Configuration
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The kernel configuration option is ALTERA_TSE:
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Device Drivers ---> Network device support ---> Ethernet driver support --->
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Altera Triple-Speed Ethernet MAC support (ALTERA_TSE)
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2) Driver parameters list:
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debug: message level (0: no output, 16: all);
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dma_rx_num: Number of descriptors in the RX list (default is 64);
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dma_tx_num: Number of descriptors in the TX list (default is 64).
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3) Command line options
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Driver parameters can be also passed in command line by using:
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altera_tse=dma_rx_num:128,dma_tx_num:512
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4) Driver information and notes
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4.1) Transmit process
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When the driver's transmit routine is called by the kernel, it sets up a
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transmit descriptor by calling the underlying DMA transmit routine (SGDMA or
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MSGDMA), and initites a transmit operation. Once the transmit is complete, an
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interrupt is driven by the transmit DMA logic. The driver handles the transmit
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completion in the context of the interrupt handling chain by recycling
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resource required to send and track the requested transmit operation.
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4.2) Receive process
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The driver will post receive buffers to the receive DMA logic during driver
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intialization. Receive buffers may or may not be queued depending upon the
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underlying DMA logic (MSGDMA is able queue receive buffers, SGDMA is not able
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to queue receive buffers to the SGDMA receive logic). When a packet is
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received, the DMA logic generates an interrupt. The driver handles a receive
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interrupt by obtaining the DMA receive logic status, reaping receive
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completions until no more receive completions are available.
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4.3) Interrupt Mitigation
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The driver is able to mitigate the number of its DMA interrupts
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using NAPI for receive operations. Interrupt mitigation is not yet supported
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for transmit operations, but will be added in a future maintenance release.
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4.4) Ethtool support
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Ethtool is supported. Driver statistics and internal errors can be taken using:
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ethtool -S ethX command. It is possible to dump registers etc.
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4.5) PHY Support
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The driver is compatible with PAL to work with PHY and GPHY devices.
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4.7) List of source files:
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o Kconfig
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o Makefile
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o altera_tse_main.c: main network device driver
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o altera_tse_ethtool.c: ethtool support
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o altera_tse.h: private driver structure and common definitions
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o altera_msgdma.h: MSGDMA implementation function definitions
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o altera_sgdma.h: SGDMA implementation function definitions
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o altera_msgdma.c: MSGDMA implementation
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o altera_sgdma.c: SGDMA implementation
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o altera_sgdmahw.h: SGDMA register and descriptor definitions
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o altera_msgdmahw.h: MSGDMA register and descriptor definitions
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o altera_utils.c: Driver utility functions
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o altera_utils.h: Driver utility function definitions
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5) Debug Information
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The driver exports debug information such as internal statistics,
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debug information, MAC and DMA registers etc.
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A user may use the ethtool support to get statistics:
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e.g. using: ethtool -S ethX (that shows the statistics counters)
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or sees the MAC registers: e.g. using: ethtool -d ethX
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The developer can also use the "debug" module parameter to get
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further debug information.
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6) Statistics Support
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The controller and driver support a mix of IEEE standard defined statistics,
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RFC defined statistics, and driver or Altera defined statistics. The four
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specifications containing the standard definitions for these statistics are
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as follows:
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o IEEE 802.3-2012 - IEEE Standard for Ethernet.
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o RFC 2863 found at http://www.rfc-editor.org/rfc/rfc2863.txt.
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o RFC 2819 found at http://www.rfc-editor.org/rfc/rfc2819.txt.
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o Altera Triple Speed Ethernet User Guide, found at http://www.altera.com
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The statistics supported by the TSE and the device driver are as follows:
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"tx_packets" is equivalent to aFramesTransmittedOK defined in IEEE 802.3-2012,
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Section 5.2.2.1.2. This statistics is the count of frames that are successfully
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transmitted.
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"rx_packets" is equivalent to aFramesReceivedOK defined in IEEE 802.3-2012,
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Section 5.2.2.1.5. This statistic is the count of frames that are successfully
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received. This count does not include any error packets such as CRC errors,
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length errors, or alignment errors.
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"rx_crc_errors" is equivalent to aFrameCheckSequenceErrors defined in IEEE
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802.3-2012, Section 5.2.2.1.6. This statistic is the count of frames that are
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an integral number of bytes in length and do not pass the CRC test as the frame
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is received.
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"rx_align_errors" is equivalent to aAlignmentErrors defined in IEEE 802.3-2012,
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Section 5.2.2.1.7. This statistic is the count of frames that are not an
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integral number of bytes in length and do not pass the CRC test as the frame is
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received.
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"tx_bytes" is equivalent to aOctetsTransmittedOK defined in IEEE 802.3-2012,
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Section 5.2.2.1.8. This statistic is the count of data and pad bytes
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successfully transmitted from the interface.
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"rx_bytes" is equivalent to aOctetsReceivedOK defined in IEEE 802.3-2012,
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Section 5.2.2.1.14. This statistic is the count of data and pad bytes
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successfully received by the controller.
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"tx_pause" is equivalent to aPAUSEMACCtrlFramesTransmitted defined in IEEE
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802.3-2012, Section 30.3.4.2. This statistic is a count of PAUSE frames
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transmitted from the network controller.
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"rx_pause" is equivalent to aPAUSEMACCtrlFramesReceived defined in IEEE
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802.3-2012, Section 30.3.4.3. This statistic is a count of PAUSE frames
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received by the network controller.
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"rx_errors" is equivalent to ifInErrors defined in RFC 2863. This statistic is
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a count of the number of packets received containing errors that prevented the
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packet from being delivered to a higher level protocol.
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"tx_errors" is equivalent to ifOutErrors defined in RFC 2863. This statistic
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is a count of the number of packets that could not be transmitted due to errors.
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"rx_unicast" is equivalent to ifInUcastPkts defined in RFC 2863. This
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statistic is a count of the number of packets received that were not addressed
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to the broadcast address or a multicast group.
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"rx_multicast" is equivalent to ifInMulticastPkts defined in RFC 2863. This
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statistic is a count of the number of packets received that were addressed to
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a multicast address group.
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"rx_broadcast" is equivalent to ifInBroadcastPkts defined in RFC 2863. This
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statistic is a count of the number of packets received that were addressed to
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the broadcast address.
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"tx_discards" is equivalent to ifOutDiscards defined in RFC 2863. This
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statistic is the number of outbound packets not transmitted even though an
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error was not detected. An example of a reason this might occur is to free up
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internal buffer space.
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"tx_unicast" is equivalent to ifOutUcastPkts defined in RFC 2863. This
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statistic counts the number of packets transmitted that were not addressed to
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a multicast group or broadcast address.
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"tx_multicast" is equivalent to ifOutMulticastPkts defined in RFC 2863. This
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statistic counts the number of packets transmitted that were addressed to a
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multicast group.
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"tx_broadcast" is equivalent to ifOutBroadcastPkts defined in RFC 2863. This
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statistic counts the number of packets transmitted that were addressed to a
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broadcast address.
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"ether_drops" is equivalent to etherStatsDropEvents defined in RFC 2819.
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This statistic counts the number of packets dropped due to lack of internal
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controller resources.
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"rx_total_bytes" is equivalent to etherStatsOctets defined in RFC 2819.
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This statistic counts the total number of bytes received by the controller,
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including error and discarded packets.
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"rx_total_packets" is equivalent to etherStatsPkts defined in RFC 2819.
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This statistic counts the total number of packets received by the controller,
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including error, discarded, unicast, multicast, and broadcast packets.
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"rx_undersize" is equivalent to etherStatsUndersizePkts defined in RFC 2819.
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This statistic counts the number of correctly formed packets received less
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than 64 bytes long.
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"rx_oversize" is equivalent to etherStatsOversizePkts defined in RFC 2819.
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This statistic counts the number of correctly formed packets greater than 1518
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bytes long.
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"rx_64_bytes" is equivalent to etherStatsPkts64Octets defined in RFC 2819.
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This statistic counts the total number of packets received that were 64 octets
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in length.
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"rx_65_127_bytes" is equivalent to etherStatsPkts65to127Octets defined in RFC
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2819. This statistic counts the total number of packets received that were
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between 65 and 127 octets in length inclusive.
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"rx_128_255_bytes" is equivalent to etherStatsPkts128to255Octets defined in
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RFC 2819. This statistic is the total number of packets received that were
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between 128 and 255 octets in length inclusive.
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"rx_256_511_bytes" is equivalent to etherStatsPkts256to511Octets defined in
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RFC 2819. This statistic is the total number of packets received that were
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between 256 and 511 octets in length inclusive.
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"rx_512_1023_bytes" is equivalent to etherStatsPkts512to1023Octets defined in
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RFC 2819. This statistic is the total number of packets received that were
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between 512 and 1023 octets in length inclusive.
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"rx_1024_1518_bytes" is equivalent to etherStatsPkts1024to1518Octets define
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in RFC 2819. This statistic is the total number of packets received that were
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between 1024 and 1518 octets in length inclusive.
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"rx_gte_1519_bytes" is a statistic defined specific to the behavior of the
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Altera TSE. This statistics counts the number of received good and errored
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frames between the length of 1519 and the maximum frame length configured
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in the frm_length register. See the Altera TSE User Guide for More details.
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"rx_jabbers" is equivalent to etherStatsJabbers defined in RFC 2819. This
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statistic is the total number of packets received that were longer than 1518
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octets, and had either a bad CRC with an integral number of octets (CRC Error)
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or a bad CRC with a non-integral number of octets (Alignment Error).
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"rx_runts" is equivalent to etherStatsFragments defined in RFC 2819. This
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statistic is the total number of packets received that were less than 64 octets
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in length and had either a bad CRC with an integral number of octets (CRC
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error) or a bad CRC with a non-integral number of octets (Alignment Error).
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