Release 4.11 drivers/scsi/fnic/fnic_isr.c

Directory: drivers/scsi/fnic
/*
 * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova 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/string.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <scsi/libfc.h>
#include <scsi/fc_frame.h>
#include "vnic_dev.h"
#include "vnic_intr.h"
#include "vnic_stats.h"
#include "fnic_io.h"
#include "fnic.h"



static irqreturn_t fnic_isr_legacy(int irq, void *data)
{
	struct fnic *fnic = data;
	u32 pba;
	unsigned long work_done = 0;

	pba = vnic_intr_legacy_pba(fnic->legacy_pba);
	if (!pba)
		return IRQ_NONE;

	fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
	atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);

	if (pba & (1 << FNIC_INTX_NOTIFY)) {
		vnic_intr_return_all_credits(&fnic->intr[FNIC_INTX_NOTIFY]);
		fnic_handle_link_event(fnic);
	}

	if (pba & (1 << FNIC_INTX_ERR)) {
		vnic_intr_return_all_credits(&fnic->intr[FNIC_INTX_ERR]);
		fnic_log_q_error(fnic);
	}

	if (pba & (1 << FNIC_INTX_WQ_RQ_COPYWQ)) {
		work_done += fnic_wq_copy_cmpl_handler(fnic, -1);
		work_done += fnic_wq_cmpl_handler(fnic, -1);
		work_done += fnic_rq_cmpl_handler(fnic, -1);

		vnic_intr_return_credits(&fnic->intr[FNIC_INTX_WQ_RQ_COPYWQ],
					 work_done,
					 1 /* unmask intr */,
					 1 /* reset intr timer */);
	}

	return IRQ_HANDLED;
}

Contributors
Person Tokens Prop Commits CommitProp
Abhijeet Joglekar 166 88.30% 2 66.67%
Hiral Patel 22 11.70% 1 33.33%
Total 188 100.00% 3 100.00%



static irqreturn_t fnic_isr_msi(int irq, void *data)
{
	struct fnic *fnic = data;
	unsigned long work_done = 0;

	fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
	atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);

	work_done += fnic_wq_copy_cmpl_handler(fnic, -1);
	work_done += fnic_wq_cmpl_handler(fnic, -1);
	work_done += fnic_rq_cmpl_handler(fnic, -1);

	vnic_intr_return_credits(&fnic->intr[0],
				 work_done,
				 1 /* unmask intr */,
				 1 /* reset intr timer */);

	return IRQ_HANDLED;
}

Contributors
Person Tokens Prop Commits CommitProp
Abhijeet Joglekar 78 78.00% 2 66.67%
Hiral Patel 22 22.00% 1 33.33%
Total 100 100.00% 3 100.00%



static irqreturn_t fnic_isr_msix_rq(int irq, void *data)
{
	struct fnic *fnic = data;
	unsigned long rq_work_done = 0;

	fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
	atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);

	rq_work_done = fnic_rq_cmpl_handler(fnic, -1);
	vnic_intr_return_credits(&fnic->intr[FNIC_MSIX_RQ],
				 rq_work_done,
				 1 /* unmask intr */,
				 1 /* reset intr timer */);

	return IRQ_HANDLED;
}

Contributors
Person Tokens Prop Commits CommitProp
Abhijeet Joglekar 58 72.50% 2 66.67%
Hiral Patel 22 27.50% 1 33.33%
Total 80 100.00% 3 100.00%



static irqreturn_t fnic_isr_msix_wq(int irq, void *data)
{
	struct fnic *fnic = data;
	unsigned long wq_work_done = 0;

	fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
	atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);

	wq_work_done = fnic_wq_cmpl_handler(fnic, -1);
	vnic_intr_return_credits(&fnic->intr[FNIC_MSIX_WQ],
				 wq_work_done,
				 1 /* unmask intr */,
				 1 /* reset intr timer */);
	return IRQ_HANDLED;
}

Contributors
Person Tokens Prop Commits CommitProp
Abhijeet Joglekar 58 72.50% 2 66.67%
Hiral Patel 22 27.50% 1 33.33%
Total 80 100.00% 3 100.00%



static irqreturn_t fnic_isr_msix_wq_copy(int irq, void *data)
{
	struct fnic *fnic = data;
	unsigned long wq_copy_work_done = 0;

	fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
	atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);

	wq_copy_work_done = fnic_wq_copy_cmpl_handler(fnic, -1);
	vnic_intr_return_credits(&fnic->intr[FNIC_MSIX_WQ_COPY],
				 wq_copy_work_done,
				 1 /* unmask intr */,
				 1 /* reset intr timer */);
	return IRQ_HANDLED;
}

Contributors
Person Tokens Prop Commits CommitProp
Abhijeet Joglekar 58 72.50% 2 66.67%
Hiral Patel 22 27.50% 1 33.33%
Total 80 100.00% 3 100.00%



static irqreturn_t fnic_isr_msix_err_notify(int irq, void *data)
{
	struct fnic *fnic = data;

	fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
	atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);

	vnic_intr_return_all_credits(&fnic->intr[FNIC_MSIX_ERR_NOTIFY]);
	fnic_log_q_error(fnic);
	fnic_handle_link_event(fnic);

	return IRQ_HANDLED;
}

Contributors
Person Tokens Prop Commits CommitProp
Abhijeet Joglekar 44 66.67% 1 50.00%
Hiral Patel 22 33.33% 1 50.00%
Total 66 100.00% 2 100.00%



void fnic_free_intr(struct fnic *fnic)
{
	int i;

	switch (vnic_dev_get_intr_mode(fnic->vdev)) {
	case VNIC_DEV_INTR_MODE_INTX:
	case VNIC_DEV_INTR_MODE_MSI:
		free_irq(fnic->pdev->irq, fnic);
		break;

	case VNIC_DEV_INTR_MODE_MSIX:
		for (i = 0; i < ARRAY_SIZE(fnic->msix); i++)
			if (fnic->msix[i].requested)
				free_irq(fnic->msix_entry[i].vector,
					 fnic->msix[i].devid);
		break;

	default:
		break;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Abhijeet Joglekar 98 100.00% 1 100.00%
Total 98 100.00% 1 100.00%



int fnic_request_intr(struct fnic *fnic)
{
	int err = 0;
	int i;

	switch (vnic_dev_get_intr_mode(fnic->vdev)) {

	case VNIC_DEV_INTR_MODE_INTX:
		err = request_irq(fnic->pdev->irq, &fnic_isr_legacy,
				  IRQF_SHARED, DRV_NAME, fnic);
		break;

	case VNIC_DEV_INTR_MODE_MSI:
		err = request_irq(fnic->pdev->irq, &fnic_isr_msi,
				  0, fnic->name, fnic);
		break;

	case VNIC_DEV_INTR_MODE_MSIX:

		sprintf(fnic->msix[FNIC_MSIX_RQ].devname,
			"%.11s-fcs-rq", fnic->name);
		fnic->msix[FNIC_MSIX_RQ].isr = fnic_isr_msix_rq;
		fnic->msix[FNIC_MSIX_RQ].devid = fnic;

		sprintf(fnic->msix[FNIC_MSIX_WQ].devname,
			"%.11s-fcs-wq", fnic->name);
		fnic->msix[FNIC_MSIX_WQ].isr = fnic_isr_msix_wq;
		fnic->msix[FNIC_MSIX_WQ].devid = fnic;

		sprintf(fnic->msix[FNIC_MSIX_WQ_COPY].devname,
			"%.11s-scsi-wq", fnic->name);
		fnic->msix[FNIC_MSIX_WQ_COPY].isr = fnic_isr_msix_wq_copy;
		fnic->msix[FNIC_MSIX_WQ_COPY].devid = fnic;

		sprintf(fnic->msix[FNIC_MSIX_ERR_NOTIFY].devname,
			"%.11s-err-notify", fnic->name);
		fnic->msix[FNIC_MSIX_ERR_NOTIFY].isr =
			fnic_isr_msix_err_notify;
		fnic->msix[FNIC_MSIX_ERR_NOTIFY].devid = fnic;

		for (i = 0; i < ARRAY_SIZE(fnic->msix); i++) {
			err = request_irq(fnic->msix_entry[i].vector,
					  fnic->msix[i].isr, 0,
					  fnic->msix[i].devname,
					  fnic->msix[i].devid);
			if (err) {
				shost_printk(KERN_ERR, fnic->lport->host,
					     "MSIX: request_irq"
					     " failed %d\n", err);
				fnic_free_intr(fnic);
				break;
			}
			fnic->msix[i].requested = 1;
		}
		break;

	default:
		break;
	}

	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Abhijeet Joglekar 350 100.00% 1 100.00%
Total 350 100.00% 1 100.00%



int fnic_set_intr_mode(struct fnic *fnic)
{
	unsigned int n = ARRAY_SIZE(fnic->rq);
	unsigned int m = ARRAY_SIZE(fnic->wq);
	unsigned int o = ARRAY_SIZE(fnic->wq_copy);
	unsigned int i;

	/*
         * Set interrupt mode (INTx, MSI, MSI-X) depending
         * system capabilities.
         *
         * Try MSI-X first
         *
         * We need n RQs, m WQs, o Copy WQs, n+m+o CQs, and n+m+o+1 INTRs
         * (last INTR is used for WQ/RQ errors and notification area)
         */

	BUG_ON(ARRAY_SIZE(fnic->msix_entry) < n + m + o + 1);
	for (i = 0; i < n + m + o + 1; i++)
		fnic->msix_entry[i].entry = i;

	if (fnic->rq_count >= n &&
	    fnic->raw_wq_count >= m &&
	    fnic->wq_copy_count >= o &&
	    fnic->cq_count >= n + m + o) {
		if (!pci_enable_msix_exact(fnic->pdev, fnic->msix_entry,
					   n + m + o + 1)) {
			fnic->rq_count = n;
			fnic->raw_wq_count = m;
			fnic->wq_copy_count = o;
			fnic->wq_count = m + o;
			fnic->cq_count = n + m + o;
			fnic->intr_count = n + m + o + 1;
			fnic->err_intr_offset = FNIC_MSIX_ERR_NOTIFY;

			FNIC_ISR_DBG(KERN_DEBUG, fnic->lport->host,
				     "Using MSI-X Interrupts\n");
			vnic_dev_set_intr_mode(fnic->vdev,
					       VNIC_DEV_INTR_MODE_MSIX);
			return 0;
		}
	}

	/*
         * Next try MSI
         * We need 1 RQ, 1 WQ, 1 WQ_COPY, 3 CQs, and 1 INTR
         */
	if (fnic->rq_count >= 1 &&
	    fnic->raw_wq_count >= 1 &&
	    fnic->wq_copy_count >= 1 &&
	    fnic->cq_count >= 3 &&
	    fnic->intr_count >= 1 &&
	    !pci_enable_msi(fnic->pdev)) {

		fnic->rq_count = 1;
		fnic->raw_wq_count = 1;
		fnic->wq_copy_count = 1;
		fnic->wq_count = 2;
		fnic->cq_count = 3;
		fnic->intr_count = 1;
		fnic->err_intr_offset = 0;

		FNIC_ISR_DBG(KERN_DEBUG, fnic->lport->host,
			     "Using MSI Interrupts\n");
		vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_MSI);

		return 0;
	}

	/*
         * Next try INTx
         * We need 1 RQ, 1 WQ, 1 WQ_COPY, 3 CQs, and 3 INTRs
         * 1 INTR is used for all 3 queues, 1 INTR for queue errors
         * 1 INTR for notification area
         */

	if (fnic->rq_count >= 1 &&
	    fnic->raw_wq_count >= 1 &&
	    fnic->wq_copy_count >= 1 &&
	    fnic->cq_count >= 3 &&
	    fnic->intr_count >= 3) {

		fnic->rq_count = 1;
		fnic->raw_wq_count = 1;
		fnic->wq_copy_count = 1;
		fnic->cq_count = 3;
		fnic->intr_count = 3;

		FNIC_ISR_DBG(KERN_DEBUG, fnic->lport->host,
			     "Using Legacy Interrupts\n");
		vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_INTX);

		return 0;
	}

	vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);

	return -EINVAL;
}

Contributors
Person Tokens Prop Commits CommitProp
Abhijeet Joglekar 443 99.77% 1 50.00%
Alexander Gordeev 1 0.23% 1 50.00%
Total 444 100.00% 2 100.00%



void fnic_clear_intr_mode(struct fnic *fnic)
{
	switch (vnic_dev_get_intr_mode(fnic->vdev)) {
	case VNIC_DEV_INTR_MODE_MSIX:
		pci_disable_msix(fnic->pdev);
		break;
	case VNIC_DEV_INTR_MODE_MSI:
		pci_disable_msi(fnic->pdev);
		break;
	default:
		break;
	}

	vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_INTX);
}

Contributors
Person Tokens Prop Commits CommitProp
Abhijeet Joglekar 54 100.00% 1 100.00%
Total 54 100.00% 1 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
Abhijeet Joglekar 1441 91.55% 2 50.00%
Hiral Patel 132 8.39% 1 25.00%
Alexander Gordeev 1 0.06% 1 25.00%
Total 1574 100.00% 4 100.00%
Directory: drivers/scsi/fnic

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Abhijeet Joglekar	166	88.30%	2	66.67%
Hiral Patel	22	11.70%	1	33.33%
Total	188	100.00%	3	100.00%
cregit-Linux how code gets into the kernel

Release 4.11 drivers/scsi/fnic/fnic_isr.c

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