/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, 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.
 *     * 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 Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER 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, WHETHER IN 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 _VMXNET3_RING_H_
#define _VMXNET3_RING_H_

#define VMXNET3_RX_CMDRING_SIZE 2

#define VMXNET3_DRIVER_VERSION_NUM 0x01012000

/* Default ring size */
#define VMXNET3_DEF_TX_RING_SIZE 512
#define VMXNET3_DEF_RX_RING_SIZE 128

#define VMXNET3_SUCCESS 0
#define VMXNET3_FAIL   -1

#define TRUE  1
#define FALSE 0


typedef struct vmxnet3_buf_info {
	uint16_t               len;
	struct rte_mbuf        *m;
	uint64_t               bufPA;
} vmxnet3_buf_info_t;

typedef struct vmxnet3_cmd_ring {
	vmxnet3_buf_info_t     *buf_info;
	uint32_t               size;
	uint32_t               next2fill;
	uint32_t               next2comp;
	uint8_t                gen;
	uint8_t                rid;
	Vmxnet3_GenericDesc    *base;
	uint64_t               basePA;
} vmxnet3_cmd_ring_t;

static inline void
vmxnet3_cmd_ring_adv_next2fill(struct vmxnet3_cmd_ring *ring)
{
	ring->next2fill++;
	if (unlikely(ring->next2fill == ring->size)) {
		ring->next2fill = 0;
		ring->gen = (uint8_t)(ring->gen ^ 1);
	}
}

static inline void
vmxnet3_cmd_ring_adv_next2comp(struct vmxnet3_cmd_ring *ring)
{
	VMXNET3_INC_RING_IDX_ONLY(ring->next2comp, ring->size);
}

static inline uint32_t
vmxnet3_cmd_ring_desc_avail(struct vmxnet3_cmd_ring *ring)
{
	return (ring->next2comp > ring->next2fill ? 0 : ring->size) +
		   ring->next2comp - ring->next2fill - 1;
}

static inline bool
vmxnet3_cmd_ring_desc_empty(struct vmxnet3_cmd_ring *ring)
{
	return ring->next2comp == ring->next2fill;
}

typedef struct vmxnet3_comp_ring {
	uint32_t               size;
	uint32_t               next2proc;
	uint8_t                gen;
	uint8_t                intr_idx;
	Vmxnet3_GenericDesc    *base;
	uint64_t               basePA;
} vmxnet3_comp_ring_t;

struct vmxnet3_data_ring {
	struct Vmxnet3_TxDataDesc *base;
	uint32_t                  size;
	uint64_t                  basePA;
};

static inline void
vmxnet3_comp_ring_adv_next2proc(struct vmxnet3_comp_ring *ring)
{
	ring->next2proc++;
	if (unlikely(ring->next2proc == ring->size)) {
		ring->next2proc = 0;
		ring->gen = (uint8_t)(ring->gen ^ 1);
	}
}

struct vmxnet3_txq_stats {
	uint64_t        drop_total; /* # of pkts dropped by the driver,
				     * the counters below track droppings due to
				     * different reasons
				     */
	uint64_t        drop_too_many_segs;
	uint64_t        drop_tso;
	uint64_t        tx_ring_full;
};

typedef struct vmxnet3_tx_queue {
	struct vmxnet3_hw            *hw;
	struct vmxnet3_cmd_ring      cmd_ring;
	struct vmxnet3_comp_ring     comp_ring;
	struct vmxnet3_data_ring     data_ring;
	uint32_t                     qid;
	struct Vmxnet3_TxQueueDesc   *shared;
	struct vmxnet3_txq_stats     stats;
	bool                         stopped;
	uint16_t                     queue_id;      /**< Device TX queue index. */
	uint8_t                      port_id;       /**< Device port identifier. */
} vmxnet3_tx_queue_t;

struct vmxnet3_rxq_stats {
	uint64_t                     drop_total;
	uint64_t                     drop_err;
	uint64_t                     drop_fcs;
	uint64_t                     rx_buf_alloc_failure;
};

typedef struct vmxnet3_rx_queue {
	struct rte_mempool          *mp;
	struct vmxnet3_hw           *hw;
	struct vmxnet3_cmd_ring     cmd_ring[VMXNET3_RX_CMDRING_SIZE];
	struct vmxnet3_comp_ring    comp_ring;
	uint32_t                    qid1;
	uint32_t                    qid2;
	Vmxnet3_RxQueueDesc         *shared;
	struct rte_mbuf             *start_seg;
	struct rte_mbuf             *last_seg;
	struct vmxnet3_rxq_stats    stats;
	bool                        stopped;
	uint16_t                    queue_id;      /**< Device RX queue index. */
	uint8_t                     port_id;       /**< Device port identifier. */
} vmxnet3_rx_queue_t;

#endif /* _VMXNET3_RING_H_ */
