Driver poll function

The DPDK fm10kvf, i40evf, igbvf or ixgbevf as a Poll Mode Driver (PMD) serves for the Intel® Gigabit Ethernet Controller, Intel® Ethernet Controller I family, Intel® 10 Gigabit Ethernet Controller NIC, Intel® Fortville 10/40 Gigabit Ethernet Controller NIC’s virtual PCI function, or PCIe host-interface of the Intel Ethernet Switch FM Series. This function implements poll file operation handler for a driver. For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will be informed that the file descriptor of a video device is available for reading. For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor will be reported as available for writing.  · The corresponding poll() function does poll_wait(). Once select returns, the User-Space read() from the driver. While I understand the basic operation of only 1 bit, what will happen in the following case: Interrupt happens, and 1 bit is set. Handler calls wake_up_interruptible(). poll() returns. User space wakes up, start to read().Reviews: 5.

Chapter Writing Ethernet Device Drivers. Generic Ethernet API. This section provides a simple description of how to write a low-level, hardware dependent ethernet driver. In eCos this is known as a “standard” driver. There is a high-level driver (which is only code — with no state of its own) that is part of the stack. The corresponding poll() function does poll_wait(). Once select returns, the User-Space read() from the driver. While I understand the basic operation of only 1 bit, what will happen in the following case: Interrupt happens, and 1 bit is set. Handler calls wake_up_interruptible(). poll() returns. User space wakes up, start to read(). Call from the driver’s poll() function. Will poll both queues. If a buffer is available to dequeue (with dqbuf) from the source queue, this will indicate that a non-blocking write can be performed, while read will be returned in case of the destination queue.

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