snic: driver for Cisco SCSI HBA
Cisco has developed a new PCI HBA interface called sNIC, which stands for SCSI NIC. This is a new storage feature supported on specialized network adapter. The new PCI function provides a uniform host interface and abstracts backend storage. [jejb: fix up checkpatch errors] Signed-off-by: Narsimhulu Musini <nmusini@cisco.com> Signed-off-by: Sesidhar Baddela <sebaddel@cisco.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Narsimhulu Musini
committed by
James Bottomley
James Bottomley
orang tua
8d2b21db49
melakukan
c8806b6c9e
204
drivers/scsi/snic/snic_isr.c
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204
drivers/scsi/snic/snic_isr.c
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/*
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* Copyright 2014 Cisco Systems, Inc. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include "vnic_dev.h"
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#include "vnic_intr.h"
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#include "vnic_stats.h"
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#include "snic_io.h"
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#include "snic.h"
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/*
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* snic_isr_msix_wq : MSIx ISR for work queue.
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*/
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static irqreturn_t
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snic_isr_msix_wq(int irq, void *data)
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{
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struct snic *snic = data;
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unsigned long wq_work_done = 0;
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snic->s_stats.misc.last_isr_time = jiffies;
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atomic64_inc(&snic->s_stats.misc.isr_cnt);
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wq_work_done = snic_wq_cmpl_handler(snic, -1);
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svnic_intr_return_credits(&snic->intr[SNIC_MSIX_WQ],
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wq_work_done,
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1 /* unmask intr */,
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1 /* reset intr timer */);
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return IRQ_HANDLED;
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} /* end of snic_isr_msix_wq */
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static irqreturn_t
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snic_isr_msix_io_cmpl(int irq, void *data)
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{
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struct snic *snic = data;
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unsigned long iocmpl_work_done = 0;
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snic->s_stats.misc.last_isr_time = jiffies;
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atomic64_inc(&snic->s_stats.misc.isr_cnt);
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iocmpl_work_done = snic_fwcq_cmpl_handler(snic, -1);
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svnic_intr_return_credits(&snic->intr[SNIC_MSIX_IO_CMPL],
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iocmpl_work_done,
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1 /* unmask intr */,
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1 /* reset intr timer */);
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return IRQ_HANDLED;
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} /* end of snic_isr_msix_io_cmpl */
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static irqreturn_t
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snic_isr_msix_err_notify(int irq, void *data)
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{
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struct snic *snic = data;
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snic->s_stats.misc.last_isr_time = jiffies;
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atomic64_inc(&snic->s_stats.misc.isr_cnt);
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svnic_intr_return_all_credits(&snic->intr[SNIC_MSIX_ERR_NOTIFY]);
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snic_log_q_error(snic);
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/*Handling link events */
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snic_handle_link_event(snic);
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return IRQ_HANDLED;
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} /* end of snic_isr_msix_err_notify */
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void
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snic_free_intr(struct snic *snic)
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{
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int i;
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/* ONLY interrupt mode MSIX is supported */
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for (i = 0; i < ARRAY_SIZE(snic->msix); i++) {
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if (snic->msix[i].requested) {
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free_irq(snic->msix_entry[i].vector,
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snic->msix[i].devid);
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}
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}
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} /* end of snic_free_intr */
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int
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snic_request_intr(struct snic *snic)
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{
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int ret = 0, i;
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enum vnic_dev_intr_mode intr_mode;
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intr_mode = svnic_dev_get_intr_mode(snic->vdev);
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SNIC_BUG_ON(intr_mode != VNIC_DEV_INTR_MODE_MSIX);
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/*
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* Currently HW supports single WQ and CQ. So passing devid as snic.
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* When hardware supports multiple WQs and CQs, one idea is
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* to pass devid as corresponding WQ or CQ ptr and retrieve snic
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* from queue ptr.
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* Except for err_notify, which is always one.
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*/
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sprintf(snic->msix[SNIC_MSIX_WQ].devname,
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"%.11s-scsi-wq",
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snic->name);
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snic->msix[SNIC_MSIX_WQ].isr = snic_isr_msix_wq;
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snic->msix[SNIC_MSIX_WQ].devid = snic;
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sprintf(snic->msix[SNIC_MSIX_IO_CMPL].devname,
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"%.11s-io-cmpl",
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snic->name);
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snic->msix[SNIC_MSIX_IO_CMPL].isr = snic_isr_msix_io_cmpl;
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snic->msix[SNIC_MSIX_IO_CMPL].devid = snic;
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sprintf(snic->msix[SNIC_MSIX_ERR_NOTIFY].devname,
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"%.11s-err-notify",
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snic->name);
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snic->msix[SNIC_MSIX_ERR_NOTIFY].isr = snic_isr_msix_err_notify;
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snic->msix[SNIC_MSIX_ERR_NOTIFY].devid = snic;
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for (i = 0; i < ARRAY_SIZE(snic->msix); i++) {
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ret = request_irq(snic->msix_entry[i].vector,
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snic->msix[i].isr,
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0,
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snic->msix[i].devname,
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snic->msix[i].devid);
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if (ret) {
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SNIC_HOST_ERR(snic->shost,
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"MSI-X: requrest_irq(%d) failed %d\n",
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i,
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ret);
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snic_free_intr(snic);
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break;
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}
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snic->msix[i].requested = 1;
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}
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return ret;
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} /* end of snic_requrest_intr */
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int
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snic_set_intr_mode(struct snic *snic)
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{
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unsigned int n = ARRAY_SIZE(snic->wq);
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unsigned int m = SNIC_CQ_IO_CMPL_MAX;
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unsigned int i;
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/*
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* We need n WQs, m CQs, and n+m+1 INTRs
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* (last INTR is used for WQ/CQ errors and notification area
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*/
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BUILD_BUG_ON((ARRAY_SIZE(snic->wq) + SNIC_CQ_IO_CMPL_MAX) >
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ARRAY_SIZE(snic->intr));
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SNIC_BUG_ON(ARRAY_SIZE(snic->msix_entry) < (n + m + 1));
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for (i = 0; i < (n + m + 1); i++)
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snic->msix_entry[i].entry = i;
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if (snic->wq_count >= n && snic->cq_count >= (n + m)) {
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if (!pci_enable_msix(snic->pdev,
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snic->msix_entry,
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(n + m + 1))) {
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snic->wq_count = n;
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snic->cq_count = n + m;
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snic->intr_count = n + m + 1;
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snic->err_intr_offset = SNIC_MSIX_ERR_NOTIFY;
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SNIC_ISR_DBG(snic->shost,
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"Using MSI-X Interrupts\n");
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svnic_dev_set_intr_mode(snic->vdev,
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VNIC_DEV_INTR_MODE_MSIX);
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return 0;
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}
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}
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svnic_dev_set_intr_mode(snic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
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return -EINVAL;
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} /* end of snic_set_intr_mode */
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void
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snic_clear_intr_mode(struct snic *snic)
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{
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pci_disable_msix(snic->pdev);
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svnic_dev_set_intr_mode(snic->vdev, VNIC_DEV_INTR_MODE_INTX);
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}
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