/*
 * This file is part of the Chelsio T4 Ethernet driver for Linux.
 *
 * Copyright (c) 2003-2014 Chelsio Communications, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef __CXGB4_OFLD_H
#define __CXGB4_OFLD_H

#include <linux/cache.h>
#include <linux/spinlock.h>
#include <linux/skbuff.h>
#include <linux/inetdevice.h>
#include <linux/atomic.h>
#include "cxgb4.h"

/* CPL message priority levels */
enum {
        CPL_PRIORITY_DATA     = 0,  /* data messages */
        CPL_PRIORITY_SETUP    = 1,  /* connection setup messages */
        CPL_PRIORITY_TEARDOWN = 0,  /* connection teardown messages */
        CPL_PRIORITY_LISTEN   = 1,  /* listen start/stop messages */
        CPL_PRIORITY_ACK      = 1,  /* RX ACK messages */
        CPL_PRIORITY_CONTROL  = 1   /* control messages */
};

#define INIT_TP_WR(w, tid) do { \
        (w)->wr.wr_hi = htonl(FW_WR_OP_V(FW_TP_WR) | \
                              FW_WR_IMMDLEN_V(sizeof(*w) - sizeof(w->wr))); \
        (w)->wr.wr_mid = htonl(FW_WR_LEN16_V(DIV_ROUND_UP(sizeof(*w), 16)) | \
                               FW_WR_FLOWID_V(tid)); \
        (w)->wr.wr_lo = cpu_to_be64(0); \
} while (0)

#define INIT_TP_WR_CPL(w, cpl, tid) do { \
        INIT_TP_WR(w, tid); \
        OPCODE_TID(w) = htonl(MK_OPCODE_TID(cpl, tid)); \
} while (0)

#define INIT_ULPTX_WR(w, wrlen, atomic, tid) do { \
        (w)->wr.wr_hi = htonl(FW_WR_OP_V(FW_ULPTX_WR) | \
                              FW_WR_ATOMIC_V(atomic)); \
        (w)->wr.wr_mid = htonl(FW_WR_LEN16_V(DIV_ROUND_UP(wrlen, 16)) | \
                               FW_WR_FLOWID_V(tid)); \
        (w)->wr.wr_lo = cpu_to_be64(0); \
} while (0)

/* Special asynchronous notification message */
#define CXGB4_MSG_AN ((void *)1)

struct serv_entry {
        void *data;
};

union aopen_entry {
        void *data;
        union aopen_entry *next;
};

/*
 * Holds the size, base address, free list start, etc of the TID, server TID,
 * and active-open TID tables.  The tables themselves are allocated dynamically.
 */
struct tid_info {
        void **tid_tab;
        unsigned int ntids;

        struct serv_entry *stid_tab;
        unsigned long *stid_bmap;
        unsigned int nstids;
        unsigned int stid_base;
        unsigned int hash_base;

        union aopen_entry *atid_tab;
        unsigned int natids;
        unsigned int atid_base;

        struct filter_entry *ftid_tab;
        unsigned int nftids;
        unsigned int ftid_base;
        unsigned int aftid_base;
        unsigned int aftid_end;
        /* Server filter region */
        unsigned int sftid_base;
        unsigned int nsftids;

        spinlock_t atid_lock ____cacheline_aligned_in_smp;
        union aopen_entry *afree;
        unsigned int atids_in_use;

        spinlock_t stid_lock;
        unsigned int stids_in_use;
        unsigned int sftids_in_use;

        /* TIDs in the TCAM */
        atomic_t tids_in_use;
        /* TIDs in the HASH */
        atomic_t hash_tids_in_use;
};

static inline void *lookup_tid(const struct tid_info *t, unsigned int tid)
{
        return tid < t->ntids ? t->tid_tab[tid] : NULL;
}

static inline void *lookup_atid(const struct tid_info *t, unsigned int atid)
{
        return atid < t->natids ? t->atid_tab[atid].data : NULL;
}

static inline void *lookup_stid(const struct tid_info *t, unsigned int stid)
{
        /* Is it a server filter TID? */
        if (t->nsftids && (stid >= t->sftid_base)) {
                stid -= t->sftid_base;
                stid += t->nstids;
        } else {
                stid -= t->stid_base;
        }

        return stid < (t->nstids + t->nsftids) ? t->stid_tab[stid].data : NULL;
}

static inline void cxgb4_insert_tid(struct tid_info *t, void *data,
                                    unsigned int tid)
{
        t->tid_tab[tid] = data;
        if (t->hash_base && (tid >= t->hash_base))
                atomic_inc(&t->hash_tids_in_use);
        else
                atomic_inc(&t->tids_in_use);
}

int cxgb4_alloc_atid(struct tid_info *t, void *data);
int cxgb4_alloc_stid(struct tid_info *t, int family, void *data);
int cxgb4_alloc_sftid(struct tid_info *t, int family, void *data);
void cxgb4_free_atid(struct tid_info *t, unsigned int atid);
void cxgb4_free_stid(struct tid_info *t, unsigned int stid, int family);
void cxgb4_remove_tid(struct tid_info *t, unsigned int qid, unsigned int tid);

struct in6_addr;

int cxgb4_create_server(const struct net_device *dev, unsigned int stid,
                        __be32 sip, __be16 sport, __be16 vlan,
                        unsigned int queue);
int cxgb4_create_server6(const struct net_device *dev, unsigned int stid,
                         const struct in6_addr *sip, __be16 sport,
                         unsigned int queue);
int cxgb4_remove_server(const struct net_device *dev, unsigned int stid,
                        unsigned int queue, bool ipv6);
int cxgb4_create_server_filter(const struct net_device *dev, unsigned int stid,
                               __be32 sip, __be16 sport, __be16 vlan,
                               unsigned int queue,
                               unsigned char port, unsigned char mask);
int cxgb4_remove_server_filter(const struct net_device *dev, unsigned int stid,
                               unsigned int queue, bool ipv6);

static inline void set_wr_txq(struct sk_buff *skb, int prio, int queue)
{
        skb_set_queue_mapping(skb, (queue << 1) | prio);
}

enum cxgb4_uld {
        CXGB4_ULD_RDMA,
        CXGB4_ULD_ISCSI,
        CXGB4_ULD_ISCSIT,
        CXGB4_ULD_MAX
};

enum cxgb4_state {
        CXGB4_STATE_UP,
        CXGB4_STATE_START_RECOVERY,
        CXGB4_STATE_DOWN,
        CXGB4_STATE_DETACH
};

enum cxgb4_control {
        CXGB4_CONTROL_DB_FULL,
        CXGB4_CONTROL_DB_EMPTY,
        CXGB4_CONTROL_DB_DROP,
};

struct pci_dev;
struct l2t_data;
struct net_device;
struct pkt_gl;
struct tp_tcp_stats;
struct t4_lro_mgr;

struct cxgb4_range {
        unsigned int start;
        unsigned int size;
};

struct cxgb4_virt_res {                      /* virtualized HW resources */
        struct cxgb4_range ddp;
        struct cxgb4_range iscsi;
        struct cxgb4_range stag;
        struct cxgb4_range rq;
        struct cxgb4_range pbl;
        struct cxgb4_range qp;
        struct cxgb4_range cq;
        struct cxgb4_range ocq;
};

#define OCQ_WIN_OFFSET(pdev, vres) \
        (pci_resource_len((pdev), 2) - roundup_pow_of_two((vres)->ocq.size))

/*
 * Block of information the LLD provides to ULDs attaching to a device.
 */
struct cxgb4_lld_info {
        struct pci_dev *pdev;                /* associated PCI device */
        struct l2t_data *l2t;                /* L2 table */
        struct tid_info *tids;               /* TID table */
        struct net_device **ports;           /* device ports */
        const struct cxgb4_virt_res *vr;     /* assorted HW resources */
        const unsigned short *mtus;          /* MTU table */
        const unsigned short *rxq_ids;       /* the ULD's Rx queue ids */
        const unsigned short *ciq_ids;       /* the ULD's concentrator IQ ids */
        unsigned short nrxq;                 /* # of Rx queues */
        unsigned short ntxq;                 /* # of Tx queues */
        unsigned short nciq;                 /* # of concentrator IQ */
        unsigned char nchan:4;               /* # of channels */
        unsigned char nports:4;              /* # of ports */
        unsigned char wr_cred;               /* WR 16-byte credits */
        unsigned char adapter_type;          /* type of adapter */
        unsigned char fw_api_ver;            /* FW API version */
        unsigned int fw_vers;                /* FW version */
        unsigned int iscsi_iolen;            /* iSCSI max I/O length */
        unsigned int cclk_ps;                /* Core clock period in psec */
        unsigned short udb_density;          /* # of user DB/page */
        unsigned short ucq_density;          /* # of user CQs/page */
        unsigned short filt_mode;            /* filter optional components */
        unsigned short tx_modq[NCHAN];       /* maps each tx channel to a */
                                             /* scheduler queue */
        void __iomem *gts_reg;               /* address of GTS register */
        void __iomem *db_reg;                /* address of kernel doorbell */
        int dbfifo_int_thresh;               /* doorbell fifo int threshold */
        unsigned int sge_ingpadboundary;     /* SGE ingress padding boundary */
        unsigned int sge_egrstatuspagesize;  /* SGE egress status page size */
        unsigned int sge_pktshift;           /* Padding between CPL and */
                                             /* packet data */
        unsigned int pf;                     /* Physical Function we're using */
        bool enable_fw_ofld_conn;            /* Enable connection through fw */
                                             /* WR */
        unsigned int max_ordird_qp;          /* Max ORD/IRD depth per RDMA QP */
        unsigned int max_ird_adapter;        /* Max IRD memory per adapter */
        bool ulptx_memwrite_dsgl;            /* use of T5 DSGL allowed */
        unsigned int iscsi_tagmask;          /* iscsi ddp tag mask */
        unsigned int iscsi_pgsz_order;       /* iscsi ddp page size orders */
        unsigned int iscsi_llimit;           /* chip's iscsi region llimit */
        void **iscsi_ppm;                    /* iscsi page pod manager */
        int nodeid;                          /* device numa node id */
};

struct cxgb4_uld_info {
        const char *name;
        void *(*add)(const struct cxgb4_lld_info *p);
        int (*rx_handler)(void *handle, const __be64 *rsp,
                          const struct pkt_gl *gl);
        int (*state_change)(void *handle, enum cxgb4_state new_state);
        int (*control)(void *handle, enum cxgb4_control control, ...);
        int (*lro_rx_handler)(void *handle, const __be64 *rsp,
                              const struct pkt_gl *gl,
                              struct t4_lro_mgr *lro_mgr,
                              struct napi_struct *napi);
        void (*lro_flush)(struct t4_lro_mgr *);
};

int cxgb4_register_uld(enum cxgb4_uld type, const struct cxgb4_uld_info *p);
int cxgb4_unregister_uld(enum cxgb4_uld type);
int cxgb4_ofld_send(struct net_device *dev, struct sk_buff *skb);
unsigned int cxgb4_dbfifo_count(const struct net_device *dev, int lpfifo);
unsigned int cxgb4_port_chan(const struct net_device *dev);
unsigned int cxgb4_port_viid(const struct net_device *dev);
unsigned int cxgb4_tp_smt_idx(enum chip_type chip, unsigned int viid);
unsigned int cxgb4_port_idx(const struct net_device *dev);
unsigned int cxgb4_best_mtu(const unsigned short *mtus, unsigned short mtu,
                            unsigned int *idx);
unsigned int cxgb4_best_aligned_mtu(const unsigned short *mtus,
                                    unsigned short header_size,
                                    unsigned short data_size_max,
                                    unsigned short data_size_align,
                                    unsigned int *mtu_idxp);
void cxgb4_get_tcp_stats(struct pci_dev *pdev, struct tp_tcp_stats *v4,
                         struct tp_tcp_stats *v6);
void cxgb4_iscsi_init(struct net_device *dev, unsigned int tag_mask,
                      const unsigned int *pgsz_order);
struct sk_buff *cxgb4_pktgl_to_skb(const struct pkt_gl *gl,
                                   unsigned int skb_len, unsigned int pull_len);
int cxgb4_sync_txq_pidx(struct net_device *dev, u16 qid, u16 pidx, u16 size);
int cxgb4_flush_eq_cache(struct net_device *dev);
int cxgb4_read_tpte(struct net_device *dev, u32 stag, __be32 *tpte);
u64 cxgb4_read_sge_timestamp(struct net_device *dev);

enum cxgb4_bar2_qtype { CXGB4_BAR2_QTYPE_EGRESS, CXGB4_BAR2_QTYPE_INGRESS };
int cxgb4_bar2_sge_qregs(struct net_device *dev,
                         unsigned int qid,
                         enum cxgb4_bar2_qtype qtype,
                         int user,
                         u64 *pbar2_qoffset,
                         unsigned int *pbar2_qid);

#endif  /* !__CXGB4_OFLD_H */