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Due to the hardware design, stick to a power of 2, such as 16, 32, 64, 128, 256, 512, 1024, or 2048. Acting as a kind of packet redirector/multiplexer, io-net is responsible for loading protocol and driver modules based on the configuration given to it on its command line (or via the mount Company About QNX Autonomous Vehicle Innovation Centre Careers Certifications Events News Releases QNX-in-Education Webinars Community Developer community Product documentation Products & Updates Forums Newsletter archive Social @ QNX Try QNX Now The NetBSD drivers have two different delay functions, both of which take an argument in microseconds. Check This Out

It's worthwhile noting that a callout timer is a one-shot thing -- it's rearmed every time, at the end of the speedo_MDI_MonitorPhy() function call. More information about this structure can be found in the Network DDK API chapter. When a buffer is sent upstream, the driver typically allocates another buffer to replace the one that was sent upstream. Shutdown In io-net, there was a pretty straightforward, two-stage shutdown.

Verifying checksums for received data If offloading of checksum verification for received packets is enabled, the driver should set the csum_flags field of the npkt_t structure as appropriate before sending the Native drivers for io-pkt support jumbo packets. For example, the ARP protocol (IP-to-Ethernet address translation) could be implemented as part of a converter module.

  1. PCI devices), the driver may be able to automatically determine the interrupt numbers.
  2. The DCMD_IO_NET_PROMISCUOUS devctl() function can also be used to take the interface out of promiscuous mode.
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  4. An 802.3-compliant physical layer device (PHY) has a unique address that can be used to access its internal registers.

If a driver will run on a single type of processor family, the driver could just use inline assembly language macros to perform the necessary cache synchronization. You can unmount an io-net driver (umount /dev/io-net/enx). devnp-speedo.so). The problem is that if the driver does unnecessary work in the shutdown callback, it risks faulting again.

Each protocol component is packaged as a shared object (e.g. Typically, allocating packet data buffers as uncacheable doubles the CPU-usage required to transfer data across the network. Network drivers should always receive broadcast packets and pass them upstream. http://www.qnx.com/developers/docs/660/topic/com.qnx.doc.core_networking/topic/native_drvr.html This structure is defined in .

Threading model The default mode of operation is for io-pkt to create one thread per CPU. The first thing speedo_init() does is check to see if it's dying (see "Shutdown," below) and if so, it immediately returns. You can increase the amount of diagnostic information that a driver logs by specifying the verbose command-line option to the driver. A queue of structures of type net_buf_t is used to describe the data fragments that are associated with the packet.

IFCAP_CSUM_TCPv6 -- TCP version 6 payload checksums. verbose Used for debugging. The address is a 5-bit value that makes it possible to have up to 32 PHY devices on a particular MII management bus. Once a thread has completed servicing the hardware, it checks to see if there's currently a stack thread running to service stack events that may have been generated as a result

In this network driver patch, the drivers for the high-performance NICs are generally configured with a default 64 transmit descriptors and 128 receive descriptors. his comment is here an NE-2000 compatible Ethernet controller). Loading and unloading a driver Once io-pkt* is running, you can dynamically load drivers at the command line using the mount command. The driver should zero-out the entire structure, then initialize the members as described in io_net_msg_dl_advert_t.

When data fragments are enqueued to the hardware to be transmitted, the driver must not modify or release the data buffers. Each data fragment of the mbuf has its physical address loaded into a tx descriptor, and the cache flushed. This value includes the 14-byte Ethernet header. this contact form deviceindex This option applies to non-PCI devices.

The MII management interface consists of a data and a clock line, and the MAC device acts as the master device during data transfers to and from the PHY. This is a numeric value and should be one of the nic_connector_types enumerated types, defined in . Remember that this function can be called over and over again at any time by io-pkt!

PAUSE frames) which simply fills up the transmit descriptor ring faster than the NIC can get it out onto the wire.

All you need to do is separate variables that are accessed during packet transmission from those that are accessed during packet reception. These events may be: time outs ISR events other things generated by the stack or protocol modules You can use a command-line option to the driver to control the priority at devctl() and ioctl()) Shutdown Threading Mutexing Terminology io-net The framework and infrastructure for network drivers and protocols used with QNX Neutrino prior to 6.4. For more information, see above.

M_CSUM_TCPv4 -- a packet contains a version 4 TCP payload, and the hardware has computed the payload checksum. Examples of this are layer-2 bridging and the "ipflow" fastforwarding of IP packets. io-net Network I/O support You must be root to start this manager. navigate here To configure the driver to use TSO, type (for example): ifconfig wm0 tso4 ifconfig wm0 Company About QNX Autonomous Vehicle Innovation Centre Careers Certifications Events News Releases QNX-in-Education Webinars Community

Generally most 10 Mbit links are half-duplex (to old hubs or repeaters, which is the original Xerox blue-book Ethernet) and most 100 Mbit links are full-duplex (switches with point-to-point connections). If the list subsequently shrinks to the point where the device is once again able to hold the entire list, the device can be taken out of promiscuous mode. by calling InterruptAttach()), but use the InterruptAttachEvent() function instead. This doesn't appear to be as much of a problem in QNX Neutrino, but you should be aware that it can be a problem if you're suffering from mysterious packet loss.

To unload a module, use a command like this: umount /dev/io-net/en0 By default, io-net populates the /dev/io-net portion of the namespace and handles mount requests of type io-net. If you do more than the initial "make it run" port, the feature sets of a ported driver and a native driver aren't really any different. If you're using the PCI bus, use the pci -v utility to check the interrupt allocation. We've defined DELAY() to do the appropriate conversion of the delay from microseconds to milliseconds, so all NetBSD ported drivers should define delay() to be DELAY().

Be careful, because when the driver calls the devctl function, it could result in its devctl() entry point being re-entered, before the devctl() callback returns! However, the TCP/IP stack always enables a small number of multicast addresses by default. For example, the statistics tracked for an 802.3 device are different from those tracked for an 802.11 wireless device. Interface statistics Drivers are expected to keep track of statistical information.

dma Specifies the channel that the device uses for DMA transfers. That is, the first byte of the MAC address must not have the least-significant bit set. The nic_config_t structure There are two main purposes for the nic_config_t structure: to provide device configuration information to higher-level software, via the DCMD_IO_NET_GET_CONFIG devctl() to store information that's obtained by parsing If you do: sysctl -a | grep 80211 with a Wi-Fi driver, you'll see net.link.ieee80211.debug and net.link.ieee80211.vap0.debug.

Developers are presented with a single unified interface, regardless of the configuration and number of networks involved. As you can see, shutdown isn't trivial to get correct for all circumstances. Packets are filtered based on the destination address in the Ethernet header. Set its initial value to 2.