From e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb Mon Sep 17 00:00:00 2001 From: Yang Zhang Date: Fri, 28 Aug 2015 09:58:54 +0800 Subject: Add qemu 2.4.0 Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5 Signed-off-by: Yang Zhang --- qemu/roms/ipxe/src/drivers/net/netfront.h | 153 ++++++++++++++++++++++++++++++ 1 file changed, 153 insertions(+) create mode 100644 qemu/roms/ipxe/src/drivers/net/netfront.h (limited to 'qemu/roms/ipxe/src/drivers/net/netfront.h') diff --git a/qemu/roms/ipxe/src/drivers/net/netfront.h b/qemu/roms/ipxe/src/drivers/net/netfront.h new file mode 100644 index 000000000..b3f899f3c --- /dev/null +++ b/qemu/roms/ipxe/src/drivers/net/netfront.h @@ -0,0 +1,153 @@ +#ifndef _NETFRONT_H +#define _NETFRONT_H + +/** @file + * + * Xen netfront driver + * + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include +#include + +/** Number of transmit ring entries */ +#define NETFRONT_NUM_TX_DESC 16 + +/** Number of receive ring entries */ +#define NETFRONT_NUM_RX_DESC 8 + +/** Grant reference indices */ +enum netfront_ref_index { + /** Transmit ring grant reference index */ + NETFRONT_REF_TX_RING = 0, + /** Transmit descriptor grant reference base index */ + NETFRONT_REF_TX_BASE, + /** Receive ring grant reference index */ + NETFRONT_REF_RX_RING = ( NETFRONT_REF_TX_BASE + NETFRONT_NUM_TX_DESC ), + /** Receive descriptor grant reference base index */ + NETFRONT_REF_RX_BASE, + /** Total number of grant references required */ + NETFRONT_REF_COUNT = ( NETFRONT_REF_RX_BASE + NETFRONT_NUM_RX_DESC ) +}; + +/** A netfront descriptor ring */ +struct netfront_ring { + /** Shared ring */ + union { + /** Transmit shared ring */ + netif_tx_sring_t *tx; + /** Receive shared ring */ + netif_rx_sring_t *rx; + /** Raw pointer */ + void *raw; + } sring; + /** Shared ring grant reference key */ + const char *ref_key; + /** Shared ring grant reference */ + grant_ref_t ref; + + /** Maximum number of used descriptors */ + size_t count; + /** I/O buffers, indexed by buffer ID */ + struct io_buffer **iobufs; + /** I/O buffer grant references, indexed by buffer ID */ + grant_ref_t *refs; + + /** Buffer ID ring */ + uint8_t *ids; + /** Buffer ID ring producer counter */ + unsigned int id_prod; + /** Buffer ID ring consumer counter */ + unsigned int id_cons; +}; + +/** + * Initialise descriptor ring + * + * @v ring Descriptor ring + * @v ref_key Shared ring grant reference key + * @v ref Shared ring grant reference + * @v count Maxium number of used descriptors + * @v iobufs I/O buffers + * @v refs I/O buffer grant references + * @v ids Buffer IDs + */ +static inline __attribute__ (( always_inline )) void +netfront_init_ring ( struct netfront_ring *ring, const char *ref_key, + grant_ref_t ref, unsigned int count, + struct io_buffer **iobufs, grant_ref_t *refs, + uint8_t *ids ) { + + ring->ref_key = ref_key; + ring->ref = ref; + ring->count = count; + ring->iobufs = iobufs; + ring->refs = refs; + ring->ids = ids; +} + +/** + * Check whether or not descriptor ring is full + * + * @v ring Descriptor ring + * @v is_full Ring is full + */ +static inline __attribute__ (( always_inline )) int +netfront_ring_is_full ( struct netfront_ring *ring ) { + unsigned int fill_level; + + fill_level = ( ring->id_prod - ring->id_cons ); + assert ( fill_level <= ring->count ); + return ( fill_level >= ring->count ); +} + +/** + * Check whether or not descriptor ring is empty + * + * @v ring Descriptor ring + * @v is_empty Ring is empty + */ +static inline __attribute__ (( always_inline )) int +netfront_ring_is_empty ( struct netfront_ring *ring ) { + + return ( ring->id_prod == ring->id_cons ); +} + +/** A netfront NIC */ +struct netfront_nic { + /** Xen device */ + struct xen_device *xendev; + /** Grant references */ + grant_ref_t refs[NETFRONT_REF_COUNT]; + + /** Transmit ring */ + struct netfront_ring tx; + /** Transmit front ring */ + netif_tx_front_ring_t tx_fring; + /** Transmit I/O buffers */ + struct io_buffer *tx_iobufs[NETFRONT_NUM_TX_DESC]; + /** Transmit I/O buffer IDs */ + uint8_t tx_ids[NETFRONT_NUM_TX_DESC]; + + /** Receive ring */ + struct netfront_ring rx; + /** Receive front ring */ + netif_rx_front_ring_t rx_fring; + /** Receive I/O buffers */ + struct io_buffer *rx_iobufs[NETFRONT_NUM_RX_DESC]; + /** Receive I/O buffer IDs */ + uint8_t rx_ids[NETFRONT_NUM_RX_DESC]; + + /** Event channel */ + struct evtchn_send event; +}; + +/** Transmit shared ring field */ +#define tx_sring tx.sring.tx + +/** Receive shared ring field */ +#define rx_sring rx.sring.rx + +#endif /* _NETFRONT_H */ -- cgit 1.2.3-korg