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Ethernet Driver Api


See ASP.NET Ajax CDN Terms of Use – http://www.asp.net/ajaxlibrary/CDN.ashx. ]]> By continuing to use this site you agree to This period, which is in jiffies, should be long enough to account for normal transmission delays (such as collisions caused by congestion on the network media). When this flag is enabled, it takes precedence over the other two promiscuous mode flags: “prmsc_all” and “prmsc_mgrp” Note 12 This note describes how to enable the hardware checksum offload features Return Values 0 - Success 1 - Failure eth_iocDescription This function is a catch all configuration API that can be used to control the device driver attributes. useful reference

The device driver calls this function. The hardware address is used to generate correct Ethernet headers before the packet is handed over to the driver for transmission. unsigned short type; The hardware type of the interface. remote0 is a host in snullnet0, and its fourth octet is the same as that of local1.

Linux Network Driver Tutorial

Intermediate drivers sit in-between the MAC and IP layers and can control all traffic being accepted by the NIC. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. int (*can_send)(struct eth_drv_sc *sc); // Send a packet of data void (*send)(struct eth_drv_sc *sc, struct eth_drv_sg *sg_list, int sg_len, int total_len, unsigned long key); // Receive [unload] a packet of data The snullinterfaces are called sn0 and sn1 by default.

unsigned char *head;unsigned char *data;unsigned char *tail;unsigned char *end; Pointers used to address the data in the packet. The driver owns this pointer and can use it at will. No real probing is performed for the snullinterface, because it is not bound to any hardware. Linux Ethernet Driver Info Netra Data Plane Software Suite 2.0 Update 2 Reference Manual C H A P T E R 4 Driver API This chapter describes the driver application programming interface (API) which consists

The socket buffer passed to hard_start_xmitcontains the physical packet as it should appear on the media, complete with the transmission-level headers. Implementation of those commands is described later in "Custom ioctl Commands". int (*hard_header) (struct sk_buff *skb, struct net_device *dev, unsigned short type, void *daddr, void *saddr, unsigned len); This function builds the hardware header from the source and destination hardware addresses that Because the real initialization is performed elsewhere, the initialization function has little to do, and a single statement does it: for (i=0; i<2; i++) if ( (result = register_netdev(snull_devs + i))

Function int NDPSHashDirectMultiple (NDPS_crypto_ctx_t ctx, int num_blk, uchar_t **outbuf, size_t *outlen, uchar_t **inbuf, size_t *inlen); Parameters ctx - The NDPS_crypto_ctx_t handle num_blk - Number of data blocks to be chained outbuf Network Data Flow Through The Linux Kernel int (*do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); Perform interface-specific ioctl commands. Thus, while a block driver is asked to send a buffer toward the kernel, the network device asksto push incoming packets toward the kernel. Many interfaces don't support this ability at all.

Linux Ethernet Driver Architecture

IFF_ALLMULTI This flag tells the interface to receive all multicast packets. They deal with the same events, but the low-level interrupt handling is slightly different. Linux Network Driver Tutorial By default, Ethernet interfaces use a hardware filter to ensure that they receive broadcast packets and packets directed to that interface's hardware address only. Linux Ethernet Driver Example Function int NDPSCrypt (NDPS_crypto_ctx_t ctx, int encrypt_flag, uchar_t *outbuf, int *outlen, uchar_t *inbuf, int inlen); Parameters ctx - The NDPS_crypto_ctx_t handle encrypt_flag = 1 - For encrypt encrypt_flag = 0 -

The kernel provides a function to start the queue: void netif_start_queue(struct net_device *dev); The open code for snull looks like the following: int snull_open(struct net_device *dev) { MOD_INC_USE_COUNT; /* request_region(), request_irq(), see here unsigned char dma; The DMA channel allocated by the device. This is the default in newly allocated buffers. This chapter describes how the network interfaces fit in with the rest of the Linux kernel and shows a memory-based modularized network interface, which is called (you guessed it) snull. Writing A Network Device Driver Part 2 By Bhaskaran

Generated on Fri Aug 4 2017 12:52:37 for CMSIS-Driver by ARM Ltd. The statistics structure is made up of several fields; the most important are rx_packets, rx_bytes, tx_packets, and tx_bytes, which contain the number of packets received and transmitted and the total number This can be a chain; the maximum size of chain supported is implementation-specific and can be discovered via ETH_IOC_GET_MAX_TX_PKT_CHAIN. this page Such general eth device structures declare ethif_probe as their init function.

The Important Fields The fields introduced here are the ones a driver might need to access. Linux Ethernet Driver Download The open method should also start the interface's transmit queue (allow it to accept packets for transmission) once it is ready to start sending data. The structure is at the core of the network subsystem of the Linux kernel, and we now introduce both the main fields of the structure and the functions used to act


void tr_configure(struct net_device *dev); Handles setup for token ring network interfaces. The open method should register any system resource it needs (I/O ports, IRQ, DMA, etc.), turn on the hardware, and increment the module usage count. The API for network drivers reflects this need, and thus looks somewhat different from the interfaces we have seen so far. Linux Ethernet Driver Source Code ARM_DRIVER_ETH_PHY : access struct for Ethernet PHY driver functions.

The way a network driver is registered by its module initialization function is different from char and block drivers. This task is normally handled by ether_type_trans, but non-Ethernet drivers will have to set skb->mac.raw directly, as shown later in "Non-Ethernet Headers". The networking layer cooperates with this strategy by allocating all socket buffers in DMA-capable space. Get More Info We are not going to describe the whole structure here, just the fields that might be used from within a driver.

We'll see the multicast flags used in "Multicasting" later in this chapter. This value can usually be set at boot or load time and modified later using ifconfig. A network provider implements network-specific actions, such as making a connection, and exposes a common interface to Windows. The Linux loopback driver is actually quite simple; it can be found in drivers/net/loopback.c.

Try Microsoft Edge A fast and secure browser that's designed for Windows 10 No thanks Get started Microsoft Windows Dev Center Technologies .NET Windows Apps Internet of Things Mixed Reality Microsoft uint32_t reserved: 29 struct ARM_ETH_MAC_ADDR Ethernet MAC Address. Functions Acting on Socket Buffers Network devices that use a sock_buff act on the structure by means of the official interface functions. Instead, it would use the loopback channel without passing through snull.

Although there is no strict need to understand the internals of sk_buff, the ability to look at its contents can be helpful when you are tracking down problems and when you Both device methods return 0 in case of success and the usual negative value in case of error. On a successful completion, it returns an opaque handle which needs to be used in other API calls that is targeted to a specific device. In both cases only the source file Space.c has to be modified if the driver must be linked to the kernel proper.

The network layer needs to have some information spelled out before it will be able to make sense of the packet. The field is set by the driver on incoming packets, as was described in "Packet Reception". Most modern network interfaces maintain an internal queue with multiple packets to transmit; in this way they can get the best performance from the network. The device address, on the other hand, must be read from the interface board in a device-specific way, and the driver should copy it to dev_addr.

void hippi_setup(struct net_device *dev); Prepares fields for a High-Performance Parallel Interface (HIPPI) high-speed interconnect driver. Another driver type is NDIS Intermediate Driver. The hardware will use this field for computing the full-checksum.