/* Broadcom NetXtreme-C/E network driver.
 *
 * Copyright (c) 2020 Broadcom Limited
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 */

#ifndef BNXT_HWRM_H
#define BNXT_HWRM_H

#include <linux/bnxt/hsi.h>

enum bnxt_hwrm_ctx_flags {
        /* Update the HWRM_API_FLAGS right below for any new non-internal bit added here */
        BNXT_HWRM_INTERNAL_CTX_OWNED    = BIT(0), /* caller owns the context */
        BNXT_HWRM_INTERNAL_RESP_DIRTY   = BIT(1), /* response contains data */
        BNXT_HWRM_CTX_SILENT            = BIT(2), /* squelch firmware errors */
        BNXT_HWRM_FULL_WAIT             = BIT(3), /* wait for full timeout of HWRM command */
};

#define HWRM_API_FLAGS (BNXT_HWRM_CTX_SILENT | BNXT_HWRM_FULL_WAIT)

struct bnxt_hwrm_ctx {
        u64 sentinel;
        dma_addr_t dma_handle;
        struct output *resp;
        struct input *req;
        dma_addr_t slice_handle;
        void *slice_addr;
        u32 slice_size;
        u32 req_len;
        enum bnxt_hwrm_ctx_flags flags;
        unsigned int timeout;
        u32 allocated;
        gfp_t gfp;
};

enum bnxt_hwrm_wait_state {
        BNXT_HWRM_PENDING,
        BNXT_HWRM_DEFERRED,
        BNXT_HWRM_COMPLETE,
        BNXT_HWRM_CANCELLED,
};

enum bnxt_hwrm_chnl { BNXT_HWRM_CHNL_CHIMP, BNXT_HWRM_CHNL_KONG };

struct bnxt_hwrm_wait_token {
        struct rcu_head rcu;
        struct hlist_node node;
        enum bnxt_hwrm_wait_state state;
        enum bnxt_hwrm_chnl dst;
        u16 seq_id;
};

void hwrm_update_token(struct bnxt *bp, u16 seq, enum bnxt_hwrm_wait_state s);

#define BNXT_HWRM_MAX_REQ_LEN           (bp->hwrm_max_req_len)
#define BNXT_HWRM_SHORT_REQ_LEN         sizeof(struct hwrm_short_input)
#define HWRM_CMD_MAX_TIMEOUT            60000U
#define SHORT_HWRM_CMD_TIMEOUT          20
#define HWRM_CMD_TIMEOUT                (bp->hwrm_cmd_timeout)
#define HWRM_RESET_TIMEOUT              ((HWRM_CMD_TIMEOUT) * 4)
#define BNXT_HWRM_TARGET                0xffff
#define BNXT_HWRM_NO_CMPL_RING          -1
#define BNXT_HWRM_REQ_MAX_SIZE          128
#define BNXT_HWRM_DMA_SIZE              (2 * PAGE_SIZE) /* space for req+resp */
#define BNXT_HWRM_RESP_RESERVED         PAGE_SIZE
#define BNXT_HWRM_RESP_OFFSET           (BNXT_HWRM_DMA_SIZE -           \
                                         BNXT_HWRM_RESP_RESERVED)
#define BNXT_HWRM_CTX_OFFSET            (BNXT_HWRM_RESP_OFFSET -        \
                                         sizeof(struct bnxt_hwrm_ctx))
#define BNXT_HWRM_DMA_ALIGN             16
#define BNXT_HWRM_SENTINEL              0xb6e1f68a12e9a7eb /* arbitrary value */
#define BNXT_HWRM_REQS_PER_PAGE         (BNXT_PAGE_SIZE /       \
                                         BNXT_HWRM_REQ_MAX_SIZE)
#define HWRM_SHORT_MIN_TIMEOUT          3
#define HWRM_SHORT_MAX_TIMEOUT          10
#define HWRM_SHORT_TIMEOUT_COUNTER      5

#define HWRM_MIN_TIMEOUT                25
#define HWRM_MAX_TIMEOUT                40

static inline unsigned int hwrm_total_timeout(unsigned int n)
{
        return n <= HWRM_SHORT_TIMEOUT_COUNTER ? n * HWRM_SHORT_MIN_TIMEOUT :
                HWRM_SHORT_TIMEOUT_COUNTER * HWRM_SHORT_MIN_TIMEOUT +
                (n - HWRM_SHORT_TIMEOUT_COUNTER) * HWRM_MIN_TIMEOUT;
}


#define HWRM_VALID_BIT_DELAY_USEC       50000

static inline bool bnxt_cfa_hwrm_message(u16 req_type)
{
        switch (req_type) {
        case HWRM_CFA_ENCAP_RECORD_ALLOC:
        case HWRM_CFA_ENCAP_RECORD_FREE:
        case HWRM_CFA_DECAP_FILTER_ALLOC:
        case HWRM_CFA_DECAP_FILTER_FREE:
        case HWRM_CFA_EM_FLOW_ALLOC:
        case HWRM_CFA_EM_FLOW_FREE:
        case HWRM_CFA_EM_FLOW_CFG:
        case HWRM_CFA_FLOW_ALLOC:
        case HWRM_CFA_FLOW_FREE:
        case HWRM_CFA_FLOW_INFO:
        case HWRM_CFA_FLOW_FLUSH:
        case HWRM_CFA_FLOW_STATS:
        case HWRM_CFA_METER_PROFILE_ALLOC:
        case HWRM_CFA_METER_PROFILE_FREE:
        case HWRM_CFA_METER_PROFILE_CFG:
        case HWRM_CFA_METER_INSTANCE_ALLOC:
        case HWRM_CFA_METER_INSTANCE_FREE:
                return true;
        default:
                return false;
        }
}

static inline bool bnxt_kong_hwrm_message(struct bnxt *bp, struct input *req)
{
        return (bp->fw_cap & BNXT_FW_CAP_KONG_MB_CHNL &&
                (bnxt_cfa_hwrm_message(le16_to_cpu(req->req_type)) ||
                 le16_to_cpu(req->target_id) == HWRM_TARGET_ID_KONG));
}

int __hwrm_req_init(struct bnxt *bp, void **req, u16 req_type, u32 req_len);
#define hwrm_req_init(bp, req, req_type) \
        __hwrm_req_init((bp), (void **)&(req), (req_type), sizeof(*(req)))
void *hwrm_req_hold(struct bnxt *bp, void *req);
void hwrm_req_drop(struct bnxt *bp, void *req);
void hwrm_req_flags(struct bnxt *bp, void *req, enum bnxt_hwrm_ctx_flags flags);
void hwrm_req_timeout(struct bnxt *bp, void *req, unsigned int timeout);
int hwrm_req_send(struct bnxt *bp, void *req);
int hwrm_req_send_silent(struct bnxt *bp, void *req);
int hwrm_req_replace(struct bnxt *bp, void *req, void *new_req, u32 len);
void hwrm_req_alloc_flags(struct bnxt *bp, void *req, gfp_t flags);
void *hwrm_req_dma_slice(struct bnxt *bp, void *req, u32 size, dma_addr_t *dma);

/* Older devices can only support req length of 128.
 * HWRM_FUNC_CFG requests which don't need fields starting at
 * num_quic_tx_key_ctxs can use this helper to avoid getting -E2BIG.
 */
static inline int
bnxt_hwrm_func_cfg_short_req_init(struct bnxt *bp,
                                  struct hwrm_func_cfg_input **req)
{
        u32 req_len;

        req_len = min_t(u32, sizeof(**req), bp->hwrm_max_ext_req_len);
        return __hwrm_req_init(bp, (void **)req, HWRM_FUNC_CFG, req_len);
}
#endif