drivers/scsi/snic/snic_res.c - linux - Git at Google

 /*
  * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
  *
  * This program is free software; you may redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; version 2 of the License.
  *
  * 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.
  */

 #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 */
	/*
	* Copyright 2014 Cisco Systems, Inc. All rights reserved.
	*
	* This program is free software; you may redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; version 2 of the License.
	*
	* 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.
	*/

	#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 */