ethernet

问题 In Ethernet PCI device driver if the driver allows applications to map user-space buffer to Driver virtual memory and allow the user to call MMAP on device driver file after opening it. Then how do implement MMAP in the PCI ETHERNET Network device driver? I have already looked in the dev_pci struct. There are some members that are named as they have something to do with MMAP but I could not pinpoint how to make a device driver implement MMAP. In the book Linux Device Driver, the author did

问题 In Ethernet PCI device driver if the driver allows applications to map user-space buffer to Driver virtual memory and allow the user to call MMAP on device driver file after opening it. Then how do implement MMAP in the PCI ETHERNET Network device driver? I have already looked in the dev_pci struct. There are some members that are named as they have something to do with MMAP but I could not pinpoint how to make a device driver implement MMAP. In the book Linux Device Driver, the author did

问题 In Ethernet PCI device driver if the driver allows applications to map user-space buffer to Driver virtual memory and allow the user to call MMAP on device driver file after opening it. Then how do implement MMAP in the PCI ETHERNET Network device driver? I have already looked in the dev_pci struct. There are some members that are named as they have something to do with MMAP but I could not pinpoint how to make a device driver implement MMAP. In the book Linux Device Driver, the author did

问题 I am working on a project which requires data to be sent FROM PC TO FPGA,which processes the data and sends it BACK TO PC. The board I am using is Atlys™ Spartan-6 FPGA Development Board. The data is to be sent as 1 byte , because 1 byte is processed at each rising edge of the clock. Could you please suggest me ways of sending data to FPGA ? Thanks 回答1: Pick some method of communication that you have access to IP (intellectual property) cores for. For example, if you can readily access a UDP

问题 I am working on a project which requires data to be sent FROM PC TO FPGA,which processes the data and sends it BACK TO PC. The board I am using is Atlys™ Spartan-6 FPGA Development Board. The data is to be sent as 1 byte , because 1 byte is processed at each rising edge of the clock. Could you please suggest me ways of sending data to FPGA ? Thanks 回答1: Pick some method of communication that you have access to IP (intellectual property) cores for. For example, if you can readily access a UDP

问题 Does Each PCI peripheral function (from Linux Device Driver -- Book Each PCI periphel is identified by a bus number, a device number, and a function number. ) specified as a pci driver data? (Question: is net_device a driver function in pci_dev as a network function ) as assigning in net_device dev pci_dev pdev .... .... pci_set_drvdata (pdev, dev); the above code is present in Linux's RealTek Ethernet driver's pci device driver's probe function from https://github.com/torvalds/linux/blob

问题 I'm very confused about exactly how the AF_PACKET socket family (for SOCK_RAW sockets) specifically relates to Ethernet (IEEE 802.3). What I understand so far: I understand the OSI Model, and how Layer 2 technologies like Ethernet fit into the model. I understand that AF_PACKET can be used with a SOCK_RAW socket to receive datagrams that contain a 14-byte Ethernet header, followed by some other higher layer protocol header(s), such as IPv4, IPv6, etc., followed by optionally a transport layer

问题 sock = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL)); setsockopt(sock, SOL_SOCKET, SO_ATTACH_FILTER, &f, sizeof (f)) With this simple BPF/LPF attach code, when I try to receive packet on the socket, will get some wrong packets that doesn't match with the filter. Seems those packets got into the socket before I call setsockopt(). Seems like should first create the AF_PACKET SOCK_RAW socket, then attach the filter, then flush the socket to get rid of those wrong packets. So the question is, how

问题 sock = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL)); setsockopt(sock, SOL_SOCKET, SO_ATTACH_FILTER, &f, sizeof (f)) With this simple BPF/LPF attach code, when I try to receive packet on the socket, will get some wrong packets that doesn't match with the filter. Seems those packets got into the socket before I call setsockopt(). Seems like should first create the AF_PACKET SOCK_RAW socket, then attach the filter, then flush the socket to get rid of those wrong packets. So the question is, how

问题 I'm trying to detect when an Ethernet cable is plugged-in or unplugged but i have some probleme and i don't know if i'm doing this good or not. I'm using NetworkChange.NetworkAddressChanged to detect when the network change and then NetworkInterface.GetAllNetworkInterfaces() for checking if Ethernet connexion is available or not with the property .OperationalStatus . But when i search for the Ethernet connexion in all the network interfaces, it return me what i'm looking for, but it always