/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2018 Chelsio Communications.
 * All rights reserved.
 */

#ifndef _CXGBE_FILTER_H_
#define _CXGBE_FILTER_H_

#include "base/t4_msg.h"
/*
 * Defined bit width of user definable filter tuples
 */
#define ETHTYPE_BITWIDTH 16
#define FRAG_BITWIDTH 1
#define MACIDX_BITWIDTH 9
#define FCOE_BITWIDTH 1
#define IPORT_BITWIDTH 3
#define MATCHTYPE_BITWIDTH 3
#define PROTO_BITWIDTH 8
#define TOS_BITWIDTH 8
#define PF_BITWIDTH 8
#define VF_BITWIDTH 8
#define IVLAN_BITWIDTH 16
#define OVLAN_BITWIDTH 16

/*
 * Filter matching rules.  These consist of a set of ingress packet field
 * (value, mask) tuples.  The associated ingress packet field matches the
 * tuple when ((field & mask) == value).  (Thus a wildcard "don't care" field
 * rule can be constructed by specifying a tuple of (0, 0).)  A filter rule
 * matches an ingress packet when all of the individual individual field
 * matching rules are true.
 *
 * Partial field masks are always valid, however, while it may be easy to
 * understand their meanings for some fields (e.g. IP address to match a
 * subnet), for others making sensible partial masks is less intuitive (e.g.
 * MPS match type) ...
 */
struct ch_filter_tuple {
	/*
	 * Compressed header matching field rules.  The TP_VLAN_PRI_MAP
	 * register selects which of these fields will participate in the
	 * filter match rules -- up to a maximum of 36 bits.  Because
	 * TP_VLAN_PRI_MAP is a global register, all filters must use the same
	 * set of fields.
	 */
	uint32_t ethtype:ETHTYPE_BITWIDTH;	/* Ethernet type */
	uint32_t frag:FRAG_BITWIDTH;		/* IP fragmentation header */
	uint32_t ivlan_vld:1;			/* inner VLAN valid */
	uint32_t ovlan_vld:1;			/* outer VLAN valid */
	uint32_t pfvf_vld:1;			/* PF/VF valid */
	uint32_t macidx:MACIDX_BITWIDTH;	/* exact match MAC index */
	uint32_t fcoe:FCOE_BITWIDTH;		/* FCoE packet */
	uint32_t iport:IPORT_BITWIDTH;		/* ingress port */
	uint32_t matchtype:MATCHTYPE_BITWIDTH;	/* MPS match type */
	uint32_t proto:PROTO_BITWIDTH;		/* protocol type */
	uint32_t tos:TOS_BITWIDTH;		/* TOS/Traffic Type */
	uint32_t pf:PF_BITWIDTH;		/* PCI-E PF ID */
	uint32_t vf:VF_BITWIDTH;		/* PCI-E VF ID */
	uint32_t ivlan:IVLAN_BITWIDTH;		/* inner VLAN */
	uint32_t ovlan:OVLAN_BITWIDTH;		/* outer VLAN */

	/*
	 * Uncompressed header matching field rules.  These are always
	 * available for field rules.
	 */
	uint8_t lip[16];	/* local IP address (IPv4 in [3:0]) */
	uint8_t fip[16];	/* foreign IP address (IPv4 in [3:0]) */
	uint16_t lport;		/* local port */
	uint16_t fport;		/* foreign port */

	/* reservations for future additions */
	uint8_t rsvd[12];
};

/*
 * Filter specification
 */
struct ch_filter_specification {
	void *private;
	/* Administrative fields for filter. */
	uint32_t hitcnts:1;	/* count filter hits in TCB */
	uint32_t prio:1;	/* filter has priority over active/server */

	/*
	 * Fundamental filter typing.  This is the one element of filter
	 * matching that doesn't exist as a (value, mask) tuple.
	 */
	uint32_t type:1;	/* 0 => IPv4, 1 => IPv6 */
	uint32_t cap:1;		/* 0 => LE-TCAM, 1 => Hash */

	/*
	 * Packet dispatch information.  Ingress packets which match the
	 * filter rules will be dropped, passed to the host or switched back
	 * out as egress packets.
	 */
	uint32_t action:2;	/* drop, pass, switch */

	uint32_t dirsteer:1;	/* 0 => RSS, 1 => steer to iq */
	uint32_t iq:10;		/* ingress queue */

	uint32_t eport:2;	/* egress port to switch packet out */
	uint32_t swapmac:1;     /* swap SMAC/DMAC for loopback packet */
	uint32_t newvlan:2;     /* rewrite VLAN Tag */
	uint8_t dmac[RTE_ETHER_ADDR_LEN];   /* new destination MAC address */
	uint16_t vlan;          /* VLAN Tag to insert */

	/*
	 * Switch proxy/rewrite fields.  An ingress packet which matches a
	 * filter with "switch" set will be looped back out as an egress
	 * packet -- potentially with some header rewriting.
	 */
	uint32_t nat_mode:3;	/* specify NAT operation mode */

	uint8_t nat_lip[16];	/* local IP to use after NAT'ing */
	uint8_t nat_fip[16];	/* foreign IP to use after NAT'ing */
	uint16_t nat_lport;	/* local port number to use after NAT'ing */
	uint16_t nat_fport;	/* foreign port number to use after NAT'ing */

	/* Filter rule value/mask pairs. */
	struct ch_filter_tuple val;
	struct ch_filter_tuple mask;
};

enum {
	FILTER_PASS = 0,	/* default */
	FILTER_DROP,
	FILTER_SWITCH
};

enum {
	VLAN_REMOVE = 1,
	VLAN_INSERT,
	VLAN_REWRITE
};

enum {
	NAT_MODE_NONE = 0,	/* No NAT performed */
	NAT_MODE_DIP,		/* NAT on Dst IP */
	NAT_MODE_DIP_DP,	/* NAT on Dst IP, Dst Port */
	NAT_MODE_DIP_DP_SIP,	/* NAT on Dst IP, Dst Port and Src IP */
	NAT_MODE_DIP_DP_SP,	/* NAT on Dst IP, Dst Port and Src Port */
	NAT_MODE_SIP_SP,	/* NAT on Src IP and Src Port */
	NAT_MODE_DIP_SIP_SP,	/* NAT on Dst IP, Src IP and Src Port */
	NAT_MODE_ALL		/* NAT on entire 4-tuple */
};

enum filter_type {
	FILTER_TYPE_IPV4 = 0,
	FILTER_TYPE_IPV6,
};

struct t4_completion {
	unsigned int done;       /* completion done (0 - No, 1 - Yes) */
	rte_spinlock_t lock;     /* completion lock */
};

/*
 * Filter operation context to allow callers to wait for
 * an asynchronous completion.
 */
struct filter_ctx {
	struct t4_completion completion; /* completion rendezvous */
	int result;                      /* result of operation */
	u32 tid;                         /* to store tid of hash filter */
};

/*
 * Host shadow copy of ingress filter entry.  This is in host native format
 * and doesn't match the ordering or bit order, etc. of the hardware or the
 * firmware command.
 */
struct filter_entry {
	/*
	 * Administrative fields for filter.
	 */
	u32 valid:1;                /* filter allocated and valid */
	u32 locked:1;               /* filter is administratively locked */
	u32 pending:1;              /* filter action is pending FW reply */
	struct filter_ctx *ctx;     /* caller's completion hook */
	struct clip_entry *clipt;   /* CLIP Table entry for IPv6 */
	struct l2t_entry *l2t;      /* Layer Two Table entry for dmac */
	struct rte_eth_dev *dev;    /* Port's rte eth device */
	void *private;              /* For use by apps using filter_entry */

	/* This will store the actual tid */
	u32 tid;

	/*
	 * The filter itself.
	 */
	struct ch_filter_specification fs;
};

#define FILTER_ID_MAX   (~0U)

struct tid_info;
struct adapter;

/**
 * Find first clear bit in the bitmap.
 */
static inline unsigned int cxgbe_find_first_zero_bit(struct rte_bitmap *bmap,
						     unsigned int size)
{
	unsigned int idx;

	for (idx = 0; idx < size; idx++)
		if (!rte_bitmap_get(bmap, idx))
			break;

	return idx;
}

/**
 * Find a free region of 'num' consecutive entries.
 */
static inline unsigned int
cxgbe_bitmap_find_free_region(struct rte_bitmap *bmap, unsigned int size,
			      unsigned int num)
{
	unsigned int idx, j, free = 0;

	if (num > size)
		return size;

	for (idx = 0; idx < size; idx += num) {
		for (j = 0; j < num; j++) {
			if (!rte_bitmap_get(bmap, idx + j)) {
				free++;
			} else {
				free = 0;
				break;
			}
		}

		/* Found the Region */
		if (free == num)
			break;

		/* Reached the end and still no region found */
		if ((idx + num) > size) {
			idx = size;
			break;
		}
	}

	return idx;
}

u8 cxgbe_filter_slots(struct adapter *adap, u8 family);
bool cxgbe_is_filter_set(struct tid_info *t, u32 fidx, u8 nentries);
void cxgbe_filter_rpl(struct adapter *adap, const struct cpl_set_tcb_rpl *rpl);
int cxgbe_set_filter(struct rte_eth_dev *dev, unsigned int filter_id,
		     struct ch_filter_specification *fs,
		     struct filter_ctx *ctx);
int cxgbe_del_filter(struct rte_eth_dev *dev, unsigned int filter_id,
		     struct ch_filter_specification *fs,
		     struct filter_ctx *ctx);
int cxgbe_alloc_ftid(struct adapter *adap, u8 nentries);
int cxgbe_init_hash_filter(struct adapter *adap);
void cxgbe_hash_filter_rpl(struct adapter *adap,
			   const struct cpl_act_open_rpl *rpl);
void cxgbe_hash_del_filter_rpl(struct adapter *adap,
			       const struct cpl_abort_rpl_rss *rpl);
int cxgbe_validate_filter(struct adapter *adap,
			  struct ch_filter_specification *fs);
int cxgbe_get_filter_count(struct adapter *adapter, unsigned int fidx,
			   u64 *c, int hash, bool get_byte);
int cxgbe_clear_filter_count(struct adapter *adapter, unsigned int fidx,
			     int hash, bool clear_byte);
#endif /* _CXGBE_FILTER_H_ */
