/* Copyright 2014-2016 Freescale Semiconductor Inc.
 * Copyright 2016 NXP
 *
 * 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 Freescale Semiconductor nor the
 *	 names of its contributors may be used to endorse or promote products
 *	 derived from this software without specific prior written permission.
 *
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") as published by the Free Software
 * Foundation, either version 2 of that License or (at your option) any
 * later version.
 *
 * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``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 Freescale Semiconductor BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __DPAA2_ETH_H
#define __DPAA2_ETH_H

#include <linux/netdevice.h>
#include <linux/if_vlan.h>

#include "../../fsl-mc/include/dpaa2-io.h"
#include "../../fsl-mc/include/dpaa2-fd.h"
#include "../../fsl-mc/include/dpbp.h"
#include "../../fsl-mc/include/dpcon.h"
#include "dpni.h"
#include "dpni-cmd.h"

#include "dpaa2-eth-trace.h"

#define DPAA2_ETH_STORE_SIZE		16

/* Maximum number of scatter-gather entries in an ingress frame,
 * considering the maximum receive frame size is 64K
 */
#define DPAA2_ETH_MAX_SG_ENTRIES	((64 * 1024) / DPAA2_ETH_RX_BUF_SIZE)

/* Maximum acceptable MTU value. It is in direct relation with the hardware
 * enforced Max Frame Length (currently 10k).
 */
#define DPAA2_ETH_MFL			(10 * 1024)
#define DPAA2_ETH_MAX_MTU		(DPAA2_ETH_MFL - VLAN_ETH_HLEN)
/* Convert L3 MTU to L2 MFL */
#define DPAA2_ETH_L2_MAX_FRM(mtu)	((mtu) + VLAN_ETH_HLEN)

/* Set the taildrop threshold (in bytes) to allow the enqueue of several jumbo
 * frames in the Rx queues (length of the current frame is not
 * taken into account when making the taildrop decision)
 */
#define DPAA2_ETH_TAILDROP_THRESH	(64 * 1024)

/* Buffer quota per queue. Must be large enough such that for minimum sized
 * frames taildrop kicks in before the bpool gets depleted, so we compute
 * how many 64B frames fit inside the taildrop threshold and add a margin
 * to accommodate the buffer refill delay.
 */
#define DPAA2_ETH_MAX_FRAMES_PER_QUEUE	(DPAA2_ETH_TAILDROP_THRESH / 64)
#define DPAA2_ETH_NUM_BUFS		(DPAA2_ETH_MAX_FRAMES_PER_QUEUE + 256)
#define DPAA2_ETH_REFILL_THRESH		DPAA2_ETH_MAX_FRAMES_PER_QUEUE

/* Maximum number of buffers that can be acquired/released through a single
 * QBMan command
 */
#define DPAA2_ETH_BUFS_PER_CMD		7

/* Hardware requires alignment for ingress/egress buffer addresses
 * and ingress buffer lengths.
 */
#define DPAA2_ETH_RX_BUF_SIZE		2048
#define DPAA2_ETH_TX_BUF_ALIGN		64
#define DPAA2_ETH_RX_BUF_ALIGN		256
#define DPAA2_ETH_NEEDED_HEADROOM(p_priv) \
	((p_priv)->tx_data_offset + DPAA2_ETH_TX_BUF_ALIGN)

/* Hardware only sees DPAA2_ETH_RX_BUF_SIZE, but we need to allocate ingress
 * buffers large enough to allow building an skb around them and also account
 * for alignment restrictions
 */
#define DPAA2_ETH_BUF_RAW_SIZE \
	(DPAA2_ETH_RX_BUF_SIZE + \
	SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) + \
	DPAA2_ETH_RX_BUF_ALIGN)

/* We are accommodating a skb backpointer and some S/G info
 * in the frame's software annotation. The hardware
 * options are either 0 or 64, so we choose the latter.
 */
#define DPAA2_ETH_SWA_SIZE		64

/* Must keep this struct smaller than DPAA2_ETH_SWA_SIZE */
struct dpaa2_eth_swa {
	struct sk_buff *skb;
	struct scatterlist *scl;
	int num_sg;
	int num_dma_bufs;
};

/* Annotation valid bits in FD FRC */
#define DPAA2_FD_FRC_FASV		0x8000
#define DPAA2_FD_FRC_FAEADV		0x4000
#define DPAA2_FD_FRC_FAPRV		0x2000
#define DPAA2_FD_FRC_FAIADV		0x1000
#define DPAA2_FD_FRC_FASWOV		0x0800
#define DPAA2_FD_FRC_FAICFDV		0x0400

/* Error bits in FD CTRL */
#define DPAA2_FD_CTRL_UFD		0x00000004
#define DPAA2_FD_CTRL_SBE		0x00000008
#define DPAA2_FD_CTRL_FSE		0x00000020
#define DPAA2_FD_CTRL_FAERR		0x00000040

#define DPAA2_FD_RX_ERR_MASK		(DPAA2_FD_CTRL_SBE	| \
					 DPAA2_FD_CTRL_FAERR)
#define DPAA2_FD_TX_ERR_MASK		(DPAA2_FD_CTRL_UFD	| \
					 DPAA2_FD_CTRL_SBE	| \
					 DPAA2_FD_CTRL_FSE	| \
					 DPAA2_FD_CTRL_FAERR)

/* Annotation bits in FD CTRL */
#define DPAA2_FD_CTRL_ASAL		0x00020000	/* ASAL = 128 */
#define DPAA2_FD_CTRL_PTA		0x00800000
#define DPAA2_FD_CTRL_PTV1		0x00400000

/* Frame annotation status */
struct dpaa2_fas {
	u8 reserved;
	u8 ppid;
	__le16 ifpid;
	__le32 status;
} __packed;

/* Frame annotation status word is located in the first 8 bytes
 * of the buffer's hardware annoatation area
 */
#define DPAA2_FAS_OFFSET		0
#define DPAA2_FAS_SIZE			(sizeof(struct dpaa2_fas))

/* Accessors for the hardware annotation fields that we use */
#define dpaa2_get_hwa(buf_addr) \
	((void *)(buf_addr) + DPAA2_ETH_SWA_SIZE)
#define dpaa2_get_fas(buf_addr) \
	(struct dpaa2_fas *)(dpaa2_get_hwa(buf_addr) + DPAA2_FAS_OFFSET)

/* Error and status bits in the frame annotation status word */
/* Debug frame, otherwise supposed to be discarded */
#define DPAA2_FAS_DISC			0x80000000
/* MACSEC frame */
#define DPAA2_FAS_MS			0x40000000
#define DPAA2_FAS_PTP			0x08000000
/* Ethernet multicast frame */
#define DPAA2_FAS_MC			0x04000000
/* Ethernet broadcast frame */
#define DPAA2_FAS_BC			0x02000000
#define DPAA2_FAS_KSE			0x00040000
#define DPAA2_FAS_EOFHE			0x00020000
#define DPAA2_FAS_MNLE			0x00010000
#define DPAA2_FAS_TIDE			0x00008000
#define DPAA2_FAS_PIEE			0x00004000
/* Frame length error */
#define DPAA2_FAS_FLE			0x00002000
/* Frame physical error */
#define DPAA2_FAS_FPE			0x00001000
#define DPAA2_FAS_PTE			0x00000080
#define DPAA2_FAS_ISP			0x00000040
#define DPAA2_FAS_PHE			0x00000020
#define DPAA2_FAS_BLE			0x00000010
/* L3 csum validation performed */
#define DPAA2_FAS_L3CV			0x00000008
/* L3 csum error */
#define DPAA2_FAS_L3CE			0x00000004
/* L4 csum validation performed */
#define DPAA2_FAS_L4CV			0x00000002
/* L4 csum error */
#define DPAA2_FAS_L4CE			0x00000001
/* Possible errors on the ingress path */
#define DPAA2_FAS_RX_ERR_MASK		(DPAA2_FAS_KSE		| \
					 DPAA2_FAS_EOFHE	| \
					 DPAA2_FAS_MNLE		| \
					 DPAA2_FAS_TIDE		| \
					 DPAA2_FAS_PIEE		| \
					 DPAA2_FAS_FLE		| \
					 DPAA2_FAS_FPE		| \
					 DPAA2_FAS_PTE		| \
					 DPAA2_FAS_ISP		| \
					 DPAA2_FAS_PHE		| \
					 DPAA2_FAS_BLE		| \
					 DPAA2_FAS_L3CE		| \
					 DPAA2_FAS_L4CE)
/* Tx errors */
#define DPAA2_FAS_TX_ERR_MASK		(DPAA2_FAS_KSE		| \
					 DPAA2_FAS_EOFHE	| \
					 DPAA2_FAS_MNLE		| \
					 DPAA2_FAS_TIDE)

/* Time in milliseconds between link state updates */
#define DPAA2_ETH_LINK_STATE_REFRESH	1000

/* Number of times to retry a frame enqueue before giving up.
 * Value determined empirically, in order to minimize the number
 * of frames dropped on Tx
 */
#define DPAA2_ETH_ENQUEUE_RETRIES	10

/* Driver statistics, other than those in struct rtnl_link_stats64.
 * These are usually collected per-CPU and aggregated by ethtool.
 */
struct dpaa2_eth_drv_stats {
	__u64	tx_conf_frames;
	__u64	tx_conf_bytes;
	__u64	tx_sg_frames;
	__u64	tx_sg_bytes;
	__u64	rx_sg_frames;
	__u64	rx_sg_bytes;
	/* Enqueues retried due to portal busy */
	__u64	tx_portal_busy;
};

/* Per-FQ statistics */
struct dpaa2_eth_fq_stats {
	/* Number of frames received on this queue */
	__u64 frames;
};

/* Per-channel statistics */
struct dpaa2_eth_ch_stats {
	/* Volatile dequeues retried due to portal busy */
	__u64 dequeue_portal_busy;
	/* Number of CDANs; useful to estimate avg NAPI len */
	__u64 cdan;
	/* Number of frames received on queues from this channel */
	__u64 frames;
	/* Pull errors */
	__u64 pull_err;
};

/* Maximum number of queues associated with a DPNI */
#define DPAA2_ETH_MAX_RX_QUEUES		16
#define DPAA2_ETH_MAX_TX_QUEUES		NR_CPUS
#define DPAA2_ETH_MAX_QUEUES		(DPAA2_ETH_MAX_RX_QUEUES + \
					DPAA2_ETH_MAX_TX_QUEUES)

#define DPAA2_ETH_MAX_DPCONS		NR_CPUS

enum dpaa2_eth_fq_type {
	DPAA2_RX_FQ = 0,
	DPAA2_TX_CONF_FQ,
};

struct dpaa2_eth_priv;

struct dpaa2_eth_fq {
	u32 fqid;
	u32 tx_qdbin;
	u16 flowid;
	int target_cpu;
	struct dpaa2_eth_channel *channel;
	enum dpaa2_eth_fq_type type;

	void (*consume)(struct dpaa2_eth_priv *,
			struct dpaa2_eth_channel *,
			const struct dpaa2_fd *,
			struct napi_struct *);
	struct dpaa2_eth_fq_stats stats;
};

struct dpaa2_eth_channel {
	struct dpaa2_io_notification_ctx nctx;
	struct fsl_mc_device *dpcon;
	int dpcon_id;
	int ch_id;
	int dpio_id;
	struct napi_struct napi;
	struct dpaa2_io_store *store;
	struct dpaa2_eth_priv *priv;
	int buf_count;
	struct dpaa2_eth_ch_stats stats;
};

struct dpaa2_eth_hash_fields {
	u64 rxnfc_field;
	enum net_prot cls_prot;
	int cls_field;
	int size;
};

/* Driver private data */
struct dpaa2_eth_priv {
	struct net_device *net_dev;

	u8 num_fqs;
	struct dpaa2_eth_fq fq[DPAA2_ETH_MAX_QUEUES];

	u8 num_channels;
	struct dpaa2_eth_channel *channel[DPAA2_ETH_MAX_DPCONS];

	struct dpni_attr dpni_attrs;
	u16 tx_data_offset;

	struct fsl_mc_device *dpbp_dev;
	u16 bpid;
	struct iommu_domain *iommu_domain;

	u16 tx_qdid;
	struct fsl_mc_io *mc_io;
	/* Cores which have an affine DPIO/DPCON.
	 * This is the cpu set on which Rx and Tx conf frames are processed
	 */
	struct cpumask dpio_cpumask;

	/* Standard statistics */
	struct rtnl_link_stats64 __percpu *percpu_stats;
	/* Extra stats, in addition to the ones known by the kernel */
	struct dpaa2_eth_drv_stats __percpu *percpu_extras;

	u16 mc_token;

	struct dpni_link_state link_state;
	bool do_link_poll;
	struct task_struct *poll_thread;

	/* enabled ethtool hashing bits */
	u64 rx_hash_fields;
};

/* default Rx hash options, set during probing */
#define DPAA2_RXH_SUPPORTED	(RXH_L2DA | RXH_VLAN | RXH_L3_PROTO \
				| RXH_IP_SRC | RXH_IP_DST | RXH_L4_B_0_1 \
				| RXH_L4_B_2_3)

#define dpaa2_eth_hash_enabled(priv)	\
	((priv)->dpni_attrs.num_queues > 1)

/* Required by struct dpni_rx_tc_dist_cfg::key_cfg_iova */
#define DPAA2_CLASSIFIER_DMA_SIZE 256

extern const struct ethtool_ops dpaa2_ethtool_ops;
extern const char dpaa2_eth_drv_version[];

static int dpaa2_eth_queue_count(struct dpaa2_eth_priv *priv)
{
	return priv->dpni_attrs.num_queues;
}

#endif	/* __DPAA2_H */