zerocopy_sg_from_iter – Build a zerocopy datagram from an iov_iter Synopsis int zerocopy_sg_from_iter(struct sk_buff *skb, struct iov_iter *from); Arguments skb buffer to copy from the source to copy from Description The function will first copy up to headlen, and then pin the userspace pages and build frags through them. Returns 0, -EFAULT or -EMSGSIZE. Copyright
zap_vma_ptes – remove ptes mapping the vma Synopsis int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, unsigned long size); Arguments vma vm_area_struct holding ptes to be zapped address starting address of pages to zap size number of bytes to zap Description This function only unmaps ptes assigned to VM_PFNMAP vmas. The entire address range must be…
zap_page_range – remove user pages in a given range Synopsis void zap_page_range(struct vm_area_struct *vma, unsigned long start, unsigned long size, struct zap_details *details); Arguments vma vm_area_struct holding the applicable pages start starting address of pages to zap size number of bytes to zap details details of shared cache invalidation Description Caller must protect the VMA…
z8530_write_port – Architecture specific interface function Synopsis void z8530_write_port(unsigned long p, u8 d); Arguments p port to write d value to write Description Write a value to a port with delays if need be. Note that the caller must hold locks to avoid read/writes from other contexts violating the 5uS rule In the longer term…
z8530_tx_done – TX complete callback Synopsis void z8530_tx_done(struct z8530_channel *c); Arguments c The channel that completed a transmit. Description This is called when we complete a packet send. We wake the queue, start the next packet going and then free the buffer of the existing packet. This code is fairly timing sensitive. Called with the…
z8530_tx_clear – Handle TX events from a stopped chip Synopsis void z8530_tx_clear(struct z8530_channel *c); Arguments c Z8530 channel to shut up Description Transmit interrupt vectors for a Z8530 that is in ‘parked’ mode. For machines with PCI Z85x30 cards, or level triggered interrupts (eg the MacII) we must clear the interrupt cause or die. Author…
z8530_tx_begin – Begin packet transmission Synopsis void z8530_tx_begin(struct z8530_channel *c); Arguments c The Z8530 channel to kick Description This is the speed sensitive side of transmission. If we are called and no buffer is being transmitted we commence the next buffer. If nothing is queued we idle the sync. Note We are handling this code…
z8530_tx – Handle a PIO transmit event Synopsis void z8530_tx(struct z8530_channel *c); Arguments c Z8530 channel to process Description Z8530 transmit interrupt handler for the PIO mode. The basic idea is to attempt to keep the FIFO fed. We fill as many bytes in as possible, its quite possible that we won’t keep up with…
z8530_sync_txdma_open – Open a Z8530 for TX driven DMA Synopsis int z8530_sync_txdma_open(struct net_device *dev, struct z8530_channel *c); Arguments dev The network device to attach c The Z8530 channel to configure in sync DMA mode. Description Set up a Z85x30 device for synchronous DMA transmission. One ISA DMA channel must be available for this to work….
z8530_sync_txdma_close – Close down a TX driven DMA channel Synopsis int z8530_sync_txdma_close(struct net_device *dev, struct z8530_channel *c); Arguments dev Network device to detach c Z8530 channel to move into discard mode Description Shut down a DMA/PIO split mode synchronous interface. Halt the DMA, and free the buffers. Author Alan Cox <alan [at] lxorguk.ukuu.org.uk> Author. Copyright
z8530_sync_open – Open a Z8530 channel for PIO Synopsis int z8530_sync_open(struct net_device *dev, struct z8530_channel *c); Arguments dev The network interface we are using c The Z8530 channel to open in synchronous PIO mode Description Switch a Z8530 into synchronous mode without DMA assist. We raise the RTS/DTR and commence network operation. Author Alan Cox…
z8530_sync_dma_open – Open a Z8530 for DMA I/O Synopsis int z8530_sync_dma_open(struct net_device *dev, struct z8530_channel *c); Arguments dev The network device to attach c The Z8530 channel to configure in sync DMA mode. Description Set up a Z85x30 device for synchronous DMA in both directions. Two ISA DMA channels must be available for this to…
z8530_sync_dma_close – Close down DMA I/O Synopsis int z8530_sync_dma_close(struct net_device *dev, struct z8530_channel *c); Arguments dev Network device to detach c Z8530 channel to move into discard mode Description Shut down a DMA mode synchronous interface. Halt the DMA, and free the buffers. Author Alan Cox <alan [at] lxorguk.ukuu.org.uk> Author. Copyright
z8530_sync_close – Close a PIO Z8530 channel Synopsis int z8530_sync_close(struct net_device *dev, struct z8530_channel *c); Arguments dev Network device to close c Z8530 channel to disassociate and move to idle Description Close down a Z8530 interface and switch its interrupt handlers to discard future events. Author Alan Cox <alan [at] lxorguk.ukuu.org.uk> Author. Copyright
z8530_status_clear – Handle status events from a stopped chip Synopsis void z8530_status_clear(struct z8530_channel *chan); Arguments chan Z8530 channel to shut up Description Status interrupt vectors for a Z8530 that is in ‘parked’ mode. For machines with PCI Z85x30 cards, or level triggered interrupts (eg the MacII) we must clear the interrupt cause or die. Author…
z8530_status – Handle a PIO status exception Synopsis void z8530_status(struct z8530_channel *chan); Arguments chan Z8530 channel to process Description A status event occurred in PIO synchronous mode. There are several reasons the chip will bother us here. A transmit underrun means we failed to feed the chip fast enough and just broke a packet. A…
z8530_shutdown – Shutdown a Z8530 device Synopsis int z8530_shutdown(struct z8530_dev *dev); Arguments dev The Z8530 chip to shutdown Description We set the interrupt handlers to silence any interrupts. We then reset the chip and wait 100uS to be sure the reset completed. Just in case the caller then tries to do stuff. This is called…
z8530_rx_done – Receive completion callback Synopsis void z8530_rx_done(struct z8530_channel *c); Arguments c The channel that completed a receive Description A new packet is complete. Our goal here is to get back into receive mode as fast as possible. On the Z85230 we could change to using ESCC mode, but on the older chips we have…
z8530_rx_clear – Handle RX events from a stopped chip Synopsis void z8530_rx_clear(struct z8530_channel *c); Arguments c Z8530 channel to shut up Description Receive interrupt vectors for a Z8530 that is in ‘parked’ mode. For machines with PCI Z85x30 cards, or level triggered interrupts (eg the MacII) we must clear the interrupt cause or die. Author…
z8530_rx – Handle a PIO receive event Synopsis void z8530_rx(struct z8530_channel *c); Arguments c Z8530 channel to process Description Receive handler for receiving in PIO mode. This is much like the async one but not quite the same or as complex Note Its intended that this handler can easily be separated from the main code…