/drivers/staging/et131x/et1310_tx.h

/*
 * Agere Systems Inc.
 * 10/100/1000 Base-T Ethernet Driver for the ET1301 and ET131x series MACs
 *
 * Copyright © 2005 Agere Systems Inc.
 * All rights reserved.
 *   http://www.agere.com
 *
 *------------------------------------------------------------------------------
 *
 * et1310_tx.h - Defines, structs, enums, prototypes, etc. pertaining to data
 *               transmission.
 *
 *------------------------------------------------------------------------------
 *
 * SOFTWARE LICENSE
 *
 * This software is provided subject to the following terms and conditions,
 * which you should read carefully before using the software.  Using this
 * software indicates your acceptance of these terms and conditions.  If you do
 * not agree with these terms and conditions, do not use the software.
 *
 * Copyright © 2005 Agere Systems Inc.
 * All rights reserved.
 *
 * Redistribution and use in source or binary forms, with or without
 * modifications, are permitted provided that the following conditions are met:
 *
 * . Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following Disclaimer as comments in the code as
 *    well as in the documentation and/or other materials provided with the
 *    distribution.
 *
 * . Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following Disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * . Neither the name of Agere Systems Inc. nor the names of the contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * Disclaimer
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, INFRINGEMENT AND THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  ANY
 * USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE IS SOLELY AT THE USERS OWN
 * RISK. IN NO EVENT SHALL AGERE SYSTEMS INC. OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, INCLUDING, BUT NOT LIMITED TO, CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 */

#ifndef __ET1310_TX_H__
#define __ET1310_TX_H__


/* Typedefs for Tx Descriptor Ring */

/*
 * word 2 of the control bits in the Tx Descriptor ring for the ET-1310
 *
 * 0-15: length of packet
 * 16-27: VLAN tag
 * 28: VLAN CFI
 * 29-31: VLAN priority
 *
 * word 3 of the control bits in the Tx Descriptor ring for the ET-1310
 *
 * 0: last packet in the sequence
 * 1: first packet in the sequence
 * 2: interrupt the processor when this pkt sent
 * 3: Control word - no packet data
 * 4: Issue half-duplex backpressure : XON/XOFF
 * 5: send pause frame
 * 6: Tx frame has error
 * 7: append CRC
 * 8: MAC override
 * 9: pad packet
 * 10: Packet is a Huge packet
 * 11: append VLAN tag
 * 12: IP checksum assist
 * 13: TCP checksum assist
 * 14: UDP checksum assist
 */

/* struct tx_desc represents each descriptor on the ring */
struct tx_desc {
	u32 addr_hi;
	u32 addr_lo;
	u32 len_vlan;	/* control words how to xmit the */
	u32 flags;	/* data (detailed above) */
};

/*
 * The status of the Tx DMA engine it sits in free memory, and is pointed to
 * by 0x101c / 0x1020. This is a DMA10 type
 */

/* TCB (Transmit Control Block: Host Side) */
struct tcb {
	struct tcb *next;	/* Next entry in ring */
	u32 flags;		/* Our flags for the packet */
	u32 count;		/* Used to spot stuck/lost packets */
	u32 stale;		/* Used to spot stuck/lost packets */
	struct sk_buff *skb;	/* Network skb we are tied to */
	u32 index;		/* Ring indexes */
	u32 index_start;
};

/* Structure representing our local reference(s) to the ring */
struct tx_ring {
	/* TCB (Transmit Control Block) memory and lists */
	struct tcb *tcb_ring;

	/* List of TCBs that are ready to be used */
	struct tcb *tcb_qhead;
	struct tcb *tcb_qtail;

	/* list of TCBs that are currently being sent.  NOTE that access to all
	 * three of these (including used) are controlled via the
	 * TCBSendQLock.  This lock should be secured prior to incementing /
	 * decrementing used, or any queue manipulation on send_head /
	 * tail
	 */
	struct tcb *send_head;
	struct tcb *send_tail;
	int used;

	/* The actual descriptor ring */
	struct tx_desc *tx_desc_ring;
	dma_addr_t tx_desc_ring_pa;

	/* send_idx indicates where we last wrote to in the descriptor ring. */
	u32 send_idx;

	/* The location of the write-back status block */
	u32 *tx_status;
	dma_addr_t tx_status_pa;

	/* Packets since the last IRQ: used for interrupt coalescing */
	int since_irq;
};

#endif /* __ET1310_TX_H__ */