It also allows you to suspend active downloads and resume downloads that have failed. Microsoft Download Manager is free and available for download now. Warning: This site requires the use of scripts, which your browser does not currently allow. See how to enable scripts. Surface Pro 7 Drivers and Firmware. Choose the download you want. Download Summary:. Total Size: 0.
Back Next. Microsoft recommends you install a download manager. Microsoft Download Manager. Manage all your internet downloads with this easy-to-use manager. It features a simple interface with many customizable options:. User may use ip link command to setup vlan interface over prueth interfaces. For example, over a hsr interface, if user would like to setup two vlan interfaces say, hsr0. The above assume we have a network with two nodes connected back to back.
The procedure is same if more than two nodes are present in the network. PRU scan the high priority queue first for packets and transmits them before transmitting packets from the lower priority queues. In the above example, after passing some UDP traffic over hsr0. As soon a VLAN interface is created, the If the entry is 1, it forwards the frame to the Host. Otherwise the frame is dropped.
There are additional controls to allow priority tagged frames to Host if the corrsponding bit is set in firmware shared memory. For example:. Network storm is defined as an excessive amount of Ethernet frames at the ingress of a network interface causing resources being wasted in the device for processing these frames and thereby affecting the device performance. PRUETH driver implements a control mechanism that user can enable to drop these frames if the number of frames received during a window msec reaches a threshold.
The driver writes the credit value in DRAM based on the user tc command. The PRU firmware uses the credit value as a counter. The driver refreshes the counter every msec. PRU Firmware upon receiving a frame decrements this counter until it becomes zero. Firmware forwards the frames to Host or ARM until the counter is non zero. PRU Firmware drops the frames if the counter is zero.
Since driver writes the credit value to DRAM every msec, the number of frames sent to host or ARM during a msec window is limited to the credit value and anything beyond that is dropped by the firmware.
Note that this feature is disabled by default and user needs to configure it explicitely to enable the feature. A write of non zero value to the sysfs file enables the feature and zero disables the feature. The value to be used may be experimented in a particular network situation and configured by the user.
In a typical network, there will be few broadcast frames per msec window such as ARP broadcast, DHCP broadcast, router advetisement etc. So user may observe the broadcast traffic in the network using network tools such as wireshark and set the credit value accordingly. Receive interrupt pacing is a firmware feature to decrease the number of interrupts that need to be handled by the host. This control when interrupt is generated by firmware and its use may result in less overhead in the Linux kernel.
NAPI already places the driver in a polling mode once interrupt is triggered. Once NAPI budget is reached, then driver re-enables interrupt. However in situations where packets are randomly spaced, then it may add additional overhead in NAPI scheduling and it is beneficial to even out the handling using interrupt pacing.
This receive interrupt pacing allows Ethernet frames to accumulate in the ingress ring buffer between the host and PRU for a configurable time, and triggers an interrupt on timeout expiry. The driver processes all queued frames upon receiving an RX interrupt. The firmware implements this RX pacing timer, which is configured by the PRUETH driver when the network device is opened and stopped when the device is closed. The user may show the timer value using the ethtool —c option which is a standard Linux command to show different coalesce parameters at the network device.
There are limited number of buffers in the receive path between Host and PRU and using a bigger value can result in packet loss. Driver supports rx-usecs and adaptive-rx parameters from the available list of parameters. There are 3 modes of pacing available:. Pacing enabled : At each timer expiry, firmware checks if any frames were received during the interval, and if so triggers an interrupt. Frames received during timer interval set a flag but do not trigger an interrupt.
Adaptive pacing enabled: At each timer expiry, firmware checks if any frames were received during the interval, and if so triggers an interrupt.
Frames received during timer interval in an empty queue trigger an interrupt immediately, frames received to a non-empty queue set a flag but do not trigger an interrupt. This can help improve latency when using pacing, but is disabled by default because as it results in lower throughput.
Pacing disabled: An interrupt is triggered for each frame received. More details on the command syntax are available by typing man ethtool on a Linux PC as this is a standard Linux command. Starting with Processor SDK 5. They are These are all optional parameters. At least one of the value to be provided to use vlan. A default value of zero is used if not supplied by the user.
For PRP, this gets added for any frame received from the node. Firmware first looks up the address in the NT upon receiving a SV frame. The look up status is indicated in a bit in the buffer descriptor. The same is checked by the driver and if the look up status indicates no success, the MAC entry is inserted to the NT by driver. For subsequent frames received from the node, the firmware updates the NT and the insertion process is skipped in the driver.
The driver also runs an ageing timer to forget the node if there was no frame received from the remote node for a period of time as specified by the standard. During the timeout, if the entry is aged, then the same is deleted from the NT. Example: If the interface name is prp0, a sample command is shown below to display the NT entries. An example snmpwalk command execution is shown below where Individual MIB variable may be queried or set using snmpset or snmpget commands.
Below are some examples Note: the locations are different from those when there is no firmware offload. For example to dump this for prp0 interface, do:. For example use Ip Address Disconnect Ethernet cable at eth2 or eth3. The Ping should continue to go through. User could run iperf between the two HSR interfaces and test the iperf is not affected when one of the cable is disconnected. This verifies redundancy. To customize the script for another device, please change the mac and ip variables.
Similarly to use a different vid, pcp and dei for supervision frame VLAN, change the same in the above script. To delete the hsr or prp interface, user may use ip link command as.
Note that the Ethernet interfaces should be updated with original MAC address after this as below assuming eth2 and eth3 interfaces. For Testing PRP, user is required to use the setup shown in the above diagram. Do the following steps to setup the prp interface.
Note that in the below example Linux interface eth2 is Link-A slave1 in ip link command and eth3 is Link-B slave2 in ip link command. This is very important for PRP as swapping them is an incorrect connection and can produce undesirable results. Same sample script mentioned earlier for HSR Testing can be used for PRP interface with command line parameter prp specified as argument. For HSR and PRP redundancy is implemented using duplicate links and sending frame over both links and discarding the duplicate at the receive side.
Here is the log for HSR that shows link failed during the test and there was no packet loss. Logs assume that iperf3 server runs on the other connected DUT. Note that during the iperf3 session, the link failed 2 times, first eth2 and then eth3 and no packet drop observed. Application is expected to send or receive packets over the hsr or prp lre interface also known as C port.
Modify the file to match unique name instead of generic name wild cards. For example to do DHCP over only eth0 interface, eth. More details on this is at [ [6] ]. If this convention is not followed, duplicate detection logic fails and duplicates are sent to upper layer causing ping application to complain about duplicates.
So when creating prp interface, make sure ip link command parameter slave 1 use linux interface associated with PRU-0 and slave 2 use interface associated with PRU Overview 2. Torrent files available. If you have never watched Game of Thrones, you are missing a piece of life!
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