linux/drivers/scsi/elx/efct/efct_xport.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2021 Broadcom. All Rights Reserved. The term
 * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
 */

#include "efct_driver.h"
#include "efct_unsol.h"

static struct dentry *efct_debugfs_root;
static atomic_t efct_debugfs_count;

static struct scsi_host_template efct_template = {
	.module			= THIS_MODULE,
	.name			= EFCT_DRIVER_NAME,
	.supported_mode		= MODE_TARGET,
};

/* globals */
static struct fc_function_template efct_xport_functions;
static struct fc_function_template efct_vport_functions;

static struct scsi_transport_template *efct_xport_fc_tt;
static struct scsi_transport_template *efct_vport_fc_tt;

struct efct_xport *
efct_xport_alloc(struct efct *efct)
{
	struct efct_xport *xport;

	xport = kzalloc(sizeof(*xport), GFP_KERNEL);
	if (!xport)
		return xport;

	xport->efct = efct;
	return xport;
}

static int
efct_xport_init_debugfs(struct efct *efct)
{
	/* Setup efct debugfs root directory */
	if (!efct_debugfs_root) {
		efct_debugfs_root = debugfs_create_dir("efct", NULL);
		atomic_set(&efct_debugfs_count, 0);
		if (!efct_debugfs_root) {
			efc_log_err(efct, "failed to create debugfs entry\n");
			goto debugfs_fail;
		}
	}

	/* Create a directory for sessions in root */
	if (!efct->sess_debugfs_dir) {
		efct->sess_debugfs_dir = debugfs_create_dir("sessions", NULL);
		if (!efct->sess_debugfs_dir) {
			efc_log_err(efct,
				    "failed to create debugfs entry for sessions\n");
			goto debugfs_fail;
		}
		atomic_inc(&efct_debugfs_count);
	}

	return 0;

debugfs_fail:
	return -EIO;
}

static void efct_xport_delete_debugfs(struct efct *efct)
{
	/* Remove session debugfs directory */
	debugfs_remove(efct->sess_debugfs_dir);
	efct->sess_debugfs_dir = NULL;
	atomic_dec(&efct_debugfs_count);

	if (atomic_read(&efct_debugfs_count) == 0) {
		/* remove root debugfs directory */
		debugfs_remove(efct_debugfs_root);
		efct_debugfs_root = NULL;
	}
}

int
efct_xport_attach(struct efct_xport *xport)
{
	struct efct *efct = xport->efct;
	int rc;

	rc = efct_hw_setup(&efct->hw, efct, efct->pci);
	if (rc) {
		efc_log_err(efct, "%s: Can't setup hardware\n", efct->desc);
		return rc;
	}

	efct_hw_parse_filter(&efct->hw, (void *)efct->filter_def);

	xport->io_pool = efct_io_pool_create(efct, efct->hw.config.n_sgl);
	if (!xport->io_pool) {
		efc_log_err(efct, "Can't allocate IO pool\n");
		return -ENOMEM;
	}

	return 0;
}

static void
efct_xport_link_stats_cb(int status, u32 num_counters,
			 struct efct_hw_link_stat_counts *counters, void *arg)
{
	union efct_xport_stats_u *result = arg;

	result->stats.link_stats.link_failure_error_count =
		counters[EFCT_HW_LINK_STAT_LINK_FAILURE_COUNT].counter;
	result->stats.link_stats.loss_of_sync_error_count =
		counters[EFCT_HW_LINK_STAT_LOSS_OF_SYNC_COUNT].counter;
	result->stats.link_stats.primitive_sequence_error_count =
		counters[EFCT_HW_LINK_STAT_PRIMITIVE_SEQ_COUNT].counter;
	result->stats.link_stats.invalid_transmission_word_error_count =
		counters[EFCT_HW_LINK_STAT_INVALID_XMIT_WORD_COUNT].counter;
	result->stats.link_stats.crc_error_count =
		counters[EFCT_HW_LINK_STAT_CRC_COUNT].counter;

	complete(&result->stats.done);
}

static void
efct_xport_host_stats_cb(int status, u32 num_counters,
			 struct efct_hw_host_stat_counts *counters, void *arg)
{
	union efct_xport_stats_u *result = arg;

	result->stats.host_stats.transmit_kbyte_count =
		counters[EFCT_HW_HOST_STAT_TX_KBYTE_COUNT].counter;
	result->stats.host_stats.receive_kbyte_count =
		counters[EFCT_HW_HOST_STAT_RX_KBYTE_COUNT].counter;
	result->stats.host_stats.transmit_frame_count =
		counters[EFCT_HW_HOST_STAT_TX_FRAME_COUNT].counter;
	result->stats.host_stats.receive_frame_count =
		counters[EFCT_HW_HOST_STAT_RX_FRAME_COUNT].counter;

	complete(&result->stats.done);
}

static void
efct_xport_async_link_stats_cb(int status, u32 num_counters,
			       struct efct_hw_link_stat_counts *counters,
			       void *arg)
{
	union efct_xport_stats_u *result = arg;

	result->stats.link_stats.link_failure_error_count =
		counters[EFCT_HW_LINK_STAT_LINK_FAILURE_COUNT].counter;
	result->stats.link_stats.loss_of_sync_error_count =
		counters[EFCT_HW_LINK_STAT_LOSS_OF_SYNC_COUNT].counter;
	result->stats.link_stats.primitive_sequence_error_count =
		counters[EFCT_HW_LINK_STAT_PRIMITIVE_SEQ_COUNT].counter;
	result->stats.link_stats.invalid_transmission_word_error_count =
		counters[EFCT_HW_LINK_STAT_INVALID_XMIT_WORD_COUNT].counter;
	result->stats.link_stats.crc_error_count =
		counters[EFCT_HW_LINK_STAT_CRC_COUNT].counter;
}

static void
efct_xport_async_host_stats_cb(int status, u32 num_counters,
			       struct efct_hw_host_stat_counts *counters,
			       void *arg)
{
	union efct_xport_stats_u *result = arg;

	result->stats.host_stats.transmit_kbyte_count =
		counters[EFCT_HW_HOST_STAT_TX_KBYTE_COUNT].counter;
	result->stats.host_stats.receive_kbyte_count =
		counters[EFCT_HW_HOST_STAT_RX_KBYTE_COUNT].counter;
	result->stats.host_stats.transmit_frame_count =
		counters[EFCT_HW_HOST_STAT_TX_FRAME_COUNT].counter;
	result->stats.host_stats.receive_frame_count =
		counters[EFCT_HW_HOST_STAT_RX_FRAME_COUNT].counter;
}

static void
efct_xport_config_stats_timer(struct efct *efct);

static void
efct_xport_stats_timer_cb(struct timer_list *t)
{
	struct efct_xport *xport = from_timer(xport, t, stats_timer);
	struct efct *efct = xport->efct;

	efct_xport_config_stats_timer(efct);
}

static void
efct_xport_config_stats_timer(struct efct *efct)
{
	u32 timeout = 3 * 1000;
	struct efct_xport *xport = NULL;

	if (!efct) {
		pr_err("%s: failed to locate EFCT device\n", __func__);
		return;
	}

	xport = efct->xport;
	efct_hw_get_link_stats(&efct->hw, 0, 0, 0,
			       efct_xport_async_link_stats_cb,
			       &xport->fc_xport_stats);
	efct_hw_get_host_stats(&efct->hw, 0, efct_xport_async_host_stats_cb,
			       &xport->fc_xport_stats);

	timer_setup(&xport->stats_timer,
		    &efct_xport_stats_timer_cb, 0);
	mod_timer(&xport->stats_timer,
		  jiffies + msecs_to_jiffies(timeout));
}

int
efct_xport_initialize(struct efct_xport *xport)
{
	struct efct *efct = xport->efct;
	int rc = 0;

	/* Initialize io lists */
	spin_lock_init(&xport->io_pending_lock);
	INIT_LIST_HEAD(&xport->io_pending_list);
	atomic_set(&xport->io_active_count, 0);
	atomic_set(&xport->io_pending_count, 0);
	atomic_set(&xport->io_total_free, 0);
	atomic_set(&xport->io_total_pending, 0);
	atomic_set(&xport->io_alloc_failed_count, 0);
	atomic_set(&xport->io_pending_recursing, 0);

	rc = efct_hw_init(&efct->hw);
	if (rc) {
		efc_log_err(efct, "efct_hw_init failure\n");
		goto out;
	}

	rc = efct_scsi_tgt_new_device(efct);
	if (rc) {
		efc_log_err(efct, "failed to initialize target\n");
		goto hw_init_out;
	}

	rc = efct_scsi_new_device(efct);
	if (rc) {
		efc_log_err(efct, "failed to initialize initiator\n");
		goto tgt_dev_out;
	}

	/* Get FC link and host statistics perodically*/
	efct_xport_config_stats_timer(efct);

	efct_xport_init_debugfs(efct);

	return rc;

tgt_dev_out:
	efct_scsi_tgt_del_device(efct);

hw_init_out:
	efct_hw_teardown(&efct->hw);
out:
	return rc;
}

int
efct_xport_status(struct efct_xport *xport, enum efct_xport_status cmd,
		  union efct_xport_stats_u *result)
{
	int rc = 0;
	struct efct *efct = NULL;
	union efct_xport_stats_u value;

	efct = xport->efct;

	switch (cmd) {
	case EFCT_XPORT_CONFIG_PORT_STATUS:
		if (xport->configured_link_state == 0) {
			/*
			 * Initial state is offline. configured_link_state is
			 * set to online explicitly when port is brought online
			 */
			xport->configured_link_state = EFCT_XPORT_PORT_OFFLINE;
		}
		result->value = xport->configured_link_state;
		break;

	case EFCT_XPORT_PORT_STATUS:
		/* Determine port status based on link speed. */
		value.value = efct_hw_get_link_speed(&efct->hw);
		if (value.value == 0)
			result->value = EFCT_XPORT_PORT_OFFLINE;
		else
			result->value = EFCT_XPORT_PORT_ONLINE;
		break;

	case EFCT_XPORT_LINK_SPEED:
		result->value = efct_hw_get_link_speed(&efct->hw);
		break;

	case EFCT_XPORT_LINK_STATISTICS:
		memcpy((void *)result, &efct->xport->fc_xport_stats,
		       sizeof(union efct_xport_stats_u));
		break;
	case EFCT_XPORT_LINK_STAT_RESET: {
		/* Create a completion to synchronize the stat reset process */
		init_completion(&result->stats.done);

		/* First reset the link stats */
		rc = efct_hw_get_link_stats(&efct->hw, 0, 1, 1,
					    efct_xport_link_stats_cb, result);
		if (rc)
			break;

		/* Wait for completion to be signaled when the cmd completes */
		if (wait_for_completion_interruptible(&result->stats.done)) {
			/* Undefined failure */
			efc_log_debug(efct, "sem wait failed\n");
			rc = -EIO;
			break;
		}

		/* Next reset the host stats */
		rc = efct_hw_get_host_stats(&efct->hw, 1,
					    efct_xport_host_stats_cb, result);

		if (rc)
			break;

		/* Wait for completion to be signaled when the cmd completes */
		if (wait_for_completion_interruptible(&result->stats.done)) {
			/* Undefined failure */
			efc_log_debug(efct, "sem wait failed\n");
			rc = -EIO;
			break;
		}
		break;
	}
	default:
		rc = -EIO;
		break;
	}

	return rc;
}

static int
efct_get_link_supported_speeds(struct efct *efct)
{
	u32 supported_speeds = 0;
	u32 link_module_type, i;
	struct {
		u32 lmt_speed;
		u32 speed;
	} supported_speed_list[] = {
		{SLI4_LINK_MODULE_TYPE_1GB, FC_PORTSPEED_1GBIT},
		{SLI4_LINK_MODULE_TYPE_2GB, FC_PORTSPEED_2GBIT},
		{SLI4_LINK_MODULE_TYPE_4GB, FC_PORTSPEED_4GBIT},
		{SLI4_LINK_MODULE_TYPE_8GB, FC_PORTSPEED_8GBIT},
		{SLI4_LINK_MODULE_TYPE_16GB, FC_PORTSPEED_16GBIT},
		{SLI4_LINK_MODULE_TYPE_32GB, FC_PORTSPEED_32GBIT},
		{SLI4_LINK_MODULE_TYPE_64GB, FC_PORTSPEED_64GBIT},
		{SLI4_LINK_MODULE_TYPE_128GB, FC_PORTSPEED_128GBIT},
	};

	link_module_type = sli_get_lmt(&efct->hw.sli);

	/* populate link supported speeds */
	for (i = 0; i < ARRAY_SIZE(supported_speed_list); i++) {
		if (link_module_type & supported_speed_list[i].lmt_speed)
			supported_speeds |= supported_speed_list[i].speed;
	}

	return supported_speeds;
}

int
efct_scsi_new_device(struct efct *efct)
{
	struct Scsi_Host *shost = NULL;
	int error = 0;
	struct efct_vport *vport = NULL;

	shost = scsi_host_alloc(&efct_template, sizeof(*vport));
	if (!shost) {
		efc_log_err(efct, "failed to allocate Scsi_Host struct\n");
		return -ENOMEM;
	}

	/* save shost to initiator-client context */
	efct->shost = shost;

	/* save efct information to shost LLD-specific space */
	vport = (struct efct_vport *)shost->hostdata;
	vport->efct = efct;

	/*
	 * Set initial can_queue value to the max SCSI IOs. This is the maximum
	 * global queue depth (as opposed to the per-LUN queue depth --
	 * .cmd_per_lun This may need to be adjusted for I+T mode.
	 */
	shost->can_queue = efct->hw.config.n_io;
	shost->max_cmd_len = 16; /* 16-byte CDBs */
	shost->max_id = 0xffff;
	shost->max_lun = 0xffffffff;

	/*
	 * can only accept (from mid-layer) as many SGEs as we've
	 * pre-registered
	 */
	shost->sg_tablesize = sli_get_max_sgl(&efct->hw.sli);

	/* attach FC Transport template to shost */
	shost->transportt = efct_xport_fc_tt;
	efc_log_debug(efct, "transport template=%p\n", efct_xport_fc_tt);

	/* get pci_dev structure and add host to SCSI ML */
	error = scsi_add_host_with_dma(shost, &efct->pci->dev,
				       &efct->pci->dev);
	if (error) {
		efc_log_debug(efct, "failed scsi_add_host_with_dma\n");
		return -EIO;
	}

	/* Set symbolic name for host port */
	snprintf(fc_host_symbolic_name(shost),
		 sizeof(fc_host_symbolic_name(shost)),
		     "Emulex %s FV%s DV%s", efct->model,
		     efct->hw.sli.fw_name[0], EFCT_DRIVER_VERSION);

	/* Set host port supported classes */
	fc_host_supported_classes(shost) = FC_COS_CLASS3;

	fc_host_supported_speeds(shost) = efct_get_link_supported_speeds(efct);

	fc_host_node_name(shost) = efct_get_wwnn(&efct->hw);
	fc_host_port_name(shost) = efct_get_wwpn(&efct->hw);
	fc_host_max_npiv_vports(shost) = 128;

	return 0;
}

struct scsi_transport_template *
efct_attach_fc_transport(void)
{
	struct scsi_transport_template *efct_fc_template = NULL;

	efct_fc_template = fc_attach_transport(&efct_xport_functions);

	if (!efct_fc_template)
		pr_err("failed to attach EFCT with fc transport\n");

	return efct_fc_template;
}

struct scsi_transport_template *
efct_attach_vport_fc_transport(void)
{
	struct scsi_transport_template *efct_fc_template = NULL;

	efct_fc_template = fc_attach_transport(&efct_vport_functions);

	if (!efct_fc_template)
		pr_err("failed to attach EFCT with fc transport\n");

	return efct_fc_template;
}

int
efct_scsi_reg_fc_transport(void)
{
	/* attach to appropriate scsi_tranport_* module */
	efct_xport_fc_tt = efct_attach_fc_transport();
	if (!efct_xport_fc_tt) {
		pr_err("%s: failed to attach to scsi_transport_*", __func__);
		return -EIO;
	}

	efct_vport_fc_tt = efct_attach_vport_fc_transport();
	if (!efct_vport_fc_tt) {
		pr_err("%s: failed to attach to scsi_transport_*", __func__);
		efct_release_fc_transport(efct_xport_fc_tt);
		efct_xport_fc_tt = NULL;
		return -EIO;
	}

	return 0;
}

void
efct_scsi_release_fc_transport(void)
{
	/* detach from scsi_transport_* */
	efct_release_fc_transport(efct_xport_fc_tt);
	efct_xport_fc_tt = NULL;
	if (efct_vport_fc_tt)
		efct_release_fc_transport(efct_vport_fc_tt);

	efct_vport_fc_tt = NULL;
}