// SPDX-License-Identifier: GPL-2.0-only
// Copyright 2014 Cisco Systems, Inc.  All rights reserved.

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>

#include "wq_enet_desc.h"
#include "cq_enet_desc.h"
#include "vnic_resource.h"
#include "vnic_dev.h"
#include "vnic_wq.h"
#include "vnic_cq.h"
#include "vnic_intr.h"
#include "vnic_stats.h"
#include "snic.h"

int
snic_get_vnic_config(struct snic *snic)
{
        struct vnic_snic_config *c = &snic->config;
        int ret;

#define GET_CONFIG(m) \
        do { \
                ret = svnic_dev_spec(snic->vdev, \
                                     offsetof(struct vnic_snic_config, m), \
                                     sizeof(c->m), \
                                     &c->m); \
                if (ret) { \
                        SNIC_HOST_ERR(snic->shost, \
                                      "Error getting %s, %d\n", #m, ret); \
                        return ret; \
                } \
        } while (0)

        GET_CONFIG(wq_enet_desc_count);
        GET_CONFIG(maxdatafieldsize);
        GET_CONFIG(intr_timer);
        GET_CONFIG(intr_timer_type);
        GET_CONFIG(flags);
        GET_CONFIG(io_throttle_count);
        GET_CONFIG(port_down_timeout);
        GET_CONFIG(port_down_io_retries);
        GET_CONFIG(luns_per_tgt);
        GET_CONFIG(xpt_type);
        GET_CONFIG(hid);

        c->wq_enet_desc_count = min_t(u32,
                                      VNIC_SNIC_WQ_DESCS_MAX,
                                      max_t(u32,
                                            VNIC_SNIC_WQ_DESCS_MIN,
                                            c->wq_enet_desc_count));

        c->wq_enet_desc_count = ALIGN(c->wq_enet_desc_count, 16);

        c->maxdatafieldsize = min_t(u32,
                                    VNIC_SNIC_MAXDATAFIELDSIZE_MAX,
                                    max_t(u32,
                                          VNIC_SNIC_MAXDATAFIELDSIZE_MIN,
                                          c->maxdatafieldsize));

        c->io_throttle_count = min_t(u32,
                                     VNIC_SNIC_IO_THROTTLE_COUNT_MAX,
                                     max_t(u32,
                                           VNIC_SNIC_IO_THROTTLE_COUNT_MIN,
                                           c->io_throttle_count));

        c->port_down_timeout = min_t(u32,
                                     VNIC_SNIC_PORT_DOWN_TIMEOUT_MAX,
                                     c->port_down_timeout);

        c->port_down_io_retries = min_t(u32,
                                     VNIC_SNIC_PORT_DOWN_IO_RETRIES_MAX,
                                     c->port_down_io_retries);

        c->luns_per_tgt = min_t(u32,
                                VNIC_SNIC_LUNS_PER_TARGET_MAX,
                                max_t(u32,
                                      VNIC_SNIC_LUNS_PER_TARGET_MIN,
                                      c->luns_per_tgt));

        c->intr_timer = min_t(u32, VNIC_INTR_TIMER_MAX, c->intr_timer);

        SNIC_INFO("vNIC resources wq %d\n", c->wq_enet_desc_count);
        SNIC_INFO("vNIC mtu %d intr timer %d\n",
                  c->maxdatafieldsize,
                  c->intr_timer);

        SNIC_INFO("vNIC flags 0x%x luns per tgt %d\n",
                  c->flags,
                  c->luns_per_tgt);

        SNIC_INFO("vNIC io throttle count %d\n", c->io_throttle_count);
        SNIC_INFO("vNIC port down timeout %d port down io retries %d\n",
                  c->port_down_timeout,
                  c->port_down_io_retries);

        SNIC_INFO("vNIC back end type = %d\n", c->xpt_type);
        SNIC_INFO("vNIC hid = %d\n", c->hid);

        return 0;
}

void
snic_get_res_counts(struct snic *snic)
{
        snic->wq_count = svnic_dev_get_res_count(snic->vdev, RES_TYPE_WQ);
        SNIC_BUG_ON(snic->wq_count == 0);
        snic->cq_count = svnic_dev_get_res_count(snic->vdev, RES_TYPE_CQ);
        SNIC_BUG_ON(snic->cq_count == 0);
        snic->intr_count = svnic_dev_get_res_count(snic->vdev,
                                                  RES_TYPE_INTR_CTRL);
        SNIC_BUG_ON(snic->intr_count == 0);
}

void
snic_free_vnic_res(struct snic *snic)
{
        unsigned int i;

        for (i = 0; i < snic->wq_count; i++)
                svnic_wq_free(&snic->wq[i]);

        for (i = 0; i < snic->cq_count; i++)
                svnic_cq_free(&snic->cq[i]);

        for (i = 0; i < snic->intr_count; i++)
                svnic_intr_free(&snic->intr[i]);
}

int
snic_alloc_vnic_res(struct snic *snic)
{
        enum vnic_dev_intr_mode intr_mode;
        unsigned int mask_on_assertion;
        unsigned int intr_offset;
        unsigned int err_intr_enable;
        unsigned int err_intr_offset;
        unsigned int i;
        int ret;

        intr_mode = svnic_dev_get_intr_mode(snic->vdev);

        SNIC_INFO("vNIC interrupt mode: %s\n",
                  ((intr_mode == VNIC_DEV_INTR_MODE_INTX) ?
                   "Legacy PCI INTx" :
                   ((intr_mode == VNIC_DEV_INTR_MODE_MSI) ?
                    "MSI" :
                    ((intr_mode == VNIC_DEV_INTR_MODE_MSIX) ?
                     "MSI-X" : "Unknown"))));

        /* only MSI-X is supported */
        SNIC_BUG_ON(intr_mode != VNIC_DEV_INTR_MODE_MSIX);

        SNIC_INFO("wq %d cq %d intr %d\n", snic->wq_count,
                  snic->cq_count,
                  snic->intr_count);


        /* Allocate WQs used for SCSI IOs */
        for (i = 0; i < snic->wq_count; i++) {
                ret = svnic_wq_alloc(snic->vdev,
                                     &snic->wq[i],
                                     i,
                                     snic->config.wq_enet_desc_count,
                                     sizeof(struct wq_enet_desc));
                if (ret)
                        goto error_cleanup;
        }

        /* CQ for each WQ */
        for (i = 0; i < snic->wq_count; i++) {
                ret = svnic_cq_alloc(snic->vdev,
                                     &snic->cq[i],
                                     i,
                                     snic->config.wq_enet_desc_count,
                                     sizeof(struct cq_enet_wq_desc));
                if (ret)
                        goto error_cleanup;
        }

        SNIC_BUG_ON(snic->cq_count != 2 * snic->wq_count);
        /* CQ for FW TO host */
        for (i = snic->wq_count; i < snic->cq_count; i++) {
                ret = svnic_cq_alloc(snic->vdev,
                                     &snic->cq[i],
                                     i,
                                     (snic->config.wq_enet_desc_count * 3),
                                     sizeof(struct snic_fw_req));
                if (ret)
                        goto error_cleanup;
        }

        for (i = 0; i < snic->intr_count; i++) {
                ret = svnic_intr_alloc(snic->vdev, &snic->intr[i], i);
                if (ret)
                        goto error_cleanup;
        }

        /*
         * Init WQ Resources.
         * WQ[0 to n] points to CQ[0 to n-1]
         * firmware to host comm points to CQ[n to m+1]
         */
        err_intr_enable = 1;
        err_intr_offset = snic->err_intr_offset;

        for (i = 0; i < snic->wq_count; i++) {
                svnic_wq_init(&snic->wq[i],
                              i,
                              err_intr_enable,
                              err_intr_offset);
        }

        for (i = 0; i < snic->cq_count; i++) {
                intr_offset = i;

                svnic_cq_init(&snic->cq[i],
                              0 /* flow_control_enable */,
                              1 /* color_enable */,
                              0 /* cq_head */,
                              0 /* cq_tail */,
                              1 /* cq_tail_color */,
                              1 /* interrupt_enable */,
                              1 /* cq_entry_enable */,
                              0 /* cq_message_enable */,
                              intr_offset,
                              0 /* cq_message_addr */);
        }

        /*
         * Init INTR resources
         * Assumption : snic is always in MSI-X mode
         */
        SNIC_BUG_ON(intr_mode != VNIC_DEV_INTR_MODE_MSIX);
        mask_on_assertion = 1;

        for (i = 0; i < snic->intr_count; i++) {
                svnic_intr_init(&snic->intr[i],
                                snic->config.intr_timer,
                                snic->config.intr_timer_type,
                                mask_on_assertion);
        }

        /* init the stats memory by making the first call here */
        ret = svnic_dev_stats_dump(snic->vdev, &snic->stats);
        if (ret) {
                SNIC_HOST_ERR(snic->shost,
                              "svnic_dev_stats_dump failed - x%x\n",
                              ret);
                goto error_cleanup;
        }

        /* Clear LIF stats */
        svnic_dev_stats_clear(snic->vdev);
        ret = 0;

        return ret;

error_cleanup:
        snic_free_vnic_res(snic);

        return ret;
}

void
snic_log_q_error(struct snic *snic)
{
        unsigned int i;
        u32 err_status;

        for (i = 0; i < snic->wq_count; i++) {
                err_status = ioread32(&snic->wq[i].ctrl->error_status);
                if (err_status)
                        SNIC_HOST_ERR(snic->shost,
                                      "WQ[%d] error status %d\n",
                                      i,
                                      err_status);
        }
} /* end of snic_log_q_error */