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![Bart Van Assche](/assets/img/avatar_default.png)
struct device supports attribute groups directly but does not support struct device_attribute directly. Hence switch to attribute groups. Link: https://lore.kernel.org/r/20211012233558.4066756-44-bvanassche@acm.org Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
1012 lines
23 KiB
C
1012 lines
23 KiB
C
/*
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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/module.h>
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#include <linux/mempool.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/skbuff.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_tcq.h>
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#include "snic.h"
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#include "snic_fwint.h"
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#define PCI_DEVICE_ID_CISCO_SNIC 0x0046
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/* Supported devices by snic module */
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static struct pci_device_id snic_id_table[] = {
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{PCI_DEVICE(0x1137, PCI_DEVICE_ID_CISCO_SNIC) },
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{ 0, } /* end of table */
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};
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unsigned int snic_log_level = 0x0;
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module_param(snic_log_level, int, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(snic_log_level, "bitmask for snic logging levels");
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#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
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unsigned int snic_trace_max_pages = 16;
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module_param(snic_trace_max_pages, uint, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(snic_trace_max_pages,
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"Total allocated memory pages for snic trace buffer");
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#endif
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unsigned int snic_max_qdepth = SNIC_DFLT_QUEUE_DEPTH;
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module_param(snic_max_qdepth, uint, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(snic_max_qdepth, "Queue depth to report for each LUN");
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/*
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* snic_slave_alloc : callback function to SCSI Mid Layer, called on
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* scsi device initialization.
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*/
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static int
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snic_slave_alloc(struct scsi_device *sdev)
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{
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struct snic_tgt *tgt = starget_to_tgt(scsi_target(sdev));
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if (!tgt || snic_tgt_chkready(tgt))
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return -ENXIO;
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return 0;
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}
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/*
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* snic_slave_configure : callback function to SCSI Mid Layer, called on
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* scsi device initialization.
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*/
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static int
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snic_slave_configure(struct scsi_device *sdev)
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{
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struct snic *snic = shost_priv(sdev->host);
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u32 qdepth = 0, max_ios = 0;
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int tmo = SNIC_DFLT_CMD_TIMEOUT * HZ;
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/* Set Queue Depth */
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max_ios = snic_max_qdepth;
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qdepth = min_t(u32, max_ios, SNIC_MAX_QUEUE_DEPTH);
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scsi_change_queue_depth(sdev, qdepth);
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if (snic->fwinfo.io_tmo > 1)
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tmo = snic->fwinfo.io_tmo * HZ;
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/* FW requires extended timeouts */
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blk_queue_rq_timeout(sdev->request_queue, tmo);
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return 0;
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}
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static int
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snic_change_queue_depth(struct scsi_device *sdev, int qdepth)
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{
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struct snic *snic = shost_priv(sdev->host);
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int qsz = 0;
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qsz = min_t(u32, qdepth, SNIC_MAX_QUEUE_DEPTH);
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if (qsz < sdev->queue_depth)
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atomic64_inc(&snic->s_stats.misc.qsz_rampdown);
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else if (qsz > sdev->queue_depth)
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atomic64_inc(&snic->s_stats.misc.qsz_rampup);
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atomic64_set(&snic->s_stats.misc.last_qsz, sdev->queue_depth);
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scsi_change_queue_depth(sdev, qsz);
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return sdev->queue_depth;
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}
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static struct scsi_host_template snic_host_template = {
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.module = THIS_MODULE,
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.name = SNIC_DRV_NAME,
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.queuecommand = snic_queuecommand,
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.eh_abort_handler = snic_abort_cmd,
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.eh_device_reset_handler = snic_device_reset,
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.eh_host_reset_handler = snic_host_reset,
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.slave_alloc = snic_slave_alloc,
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.slave_configure = snic_slave_configure,
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.change_queue_depth = snic_change_queue_depth,
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.this_id = -1,
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.cmd_per_lun = SNIC_DFLT_QUEUE_DEPTH,
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.can_queue = SNIC_MAX_IO_REQ,
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.sg_tablesize = SNIC_MAX_SG_DESC_CNT,
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.max_sectors = 0x800,
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.shost_groups = snic_host_groups,
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.track_queue_depth = 1,
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.cmd_size = sizeof(struct snic_internal_io_state),
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.proc_name = "snic_scsi",
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};
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/*
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* snic_handle_link_event : Handles link events such as link up/down/error
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*/
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void
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snic_handle_link_event(struct snic *snic)
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{
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unsigned long flags;
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spin_lock_irqsave(&snic->snic_lock, flags);
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if (snic->stop_link_events) {
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spin_unlock_irqrestore(&snic->snic_lock, flags);
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return;
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}
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spin_unlock_irqrestore(&snic->snic_lock, flags);
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queue_work(snic_glob->event_q, &snic->link_work);
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} /* end of snic_handle_link_event */
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/*
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* snic_notify_set : sets notification area
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* This notification area is to receive events from fw
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* Note: snic supports only MSIX interrupts, in which we can just call
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* svnic_dev_notify_set directly
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*/
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static int
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snic_notify_set(struct snic *snic)
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{
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int ret = 0;
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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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if (intr_mode == VNIC_DEV_INTR_MODE_MSIX) {
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ret = svnic_dev_notify_set(snic->vdev, SNIC_MSIX_ERR_NOTIFY);
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} else {
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SNIC_HOST_ERR(snic->shost,
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"Interrupt mode should be setup before devcmd notify set %d\n",
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intr_mode);
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ret = -1;
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}
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return ret;
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} /* end of snic_notify_set */
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/*
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* snic_dev_wait : polls vnic open status.
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*/
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static int
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snic_dev_wait(struct vnic_dev *vdev,
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int (*start)(struct vnic_dev *, int),
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int (*finished)(struct vnic_dev *, int *),
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int arg)
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{
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unsigned long time;
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int ret, done;
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int retry_cnt = 0;
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ret = start(vdev, arg);
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if (ret)
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return ret;
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/*
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* Wait for func to complete...2 seconds max.
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*
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* Sometimes schedule_timeout_uninterruptible take long time
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* to wakeup, which results skipping retry. The retry counter
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* ensures to retry at least two times.
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*/
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time = jiffies + (HZ * 2);
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do {
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ret = finished(vdev, &done);
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if (ret)
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return ret;
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if (done)
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return 0;
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schedule_timeout_uninterruptible(HZ/10);
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++retry_cnt;
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} while (time_after(time, jiffies) || (retry_cnt < 3));
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return -ETIMEDOUT;
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} /* end of snic_dev_wait */
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/*
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* snic_cleanup: called by snic_remove
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* Stops the snic device, masks all interrupts, Completed CQ entries are
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* drained. Posted WQ/RQ/Copy-WQ entries are cleanup
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*/
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static int
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snic_cleanup(struct snic *snic)
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{
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unsigned int i;
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int ret;
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svnic_dev_disable(snic->vdev);
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for (i = 0; i < snic->intr_count; i++)
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svnic_intr_mask(&snic->intr[i]);
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for (i = 0; i < snic->wq_count; i++) {
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ret = svnic_wq_disable(&snic->wq[i]);
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if (ret)
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return ret;
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}
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/* Clean up completed IOs */
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snic_fwcq_cmpl_handler(snic, -1);
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snic_wq_cmpl_handler(snic, -1);
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/* Clean up the IOs that have not completed */
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for (i = 0; i < snic->wq_count; i++)
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svnic_wq_clean(&snic->wq[i], snic_free_wq_buf);
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for (i = 0; i < snic->cq_count; i++)
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svnic_cq_clean(&snic->cq[i]);
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for (i = 0; i < snic->intr_count; i++)
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svnic_intr_clean(&snic->intr[i]);
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/* Cleanup snic specific requests */
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snic_free_all_untagged_reqs(snic);
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/* Cleanup Pending SCSI commands */
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snic_shutdown_scsi_cleanup(snic);
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for (i = 0; i < SNIC_REQ_MAX_CACHES; i++)
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mempool_destroy(snic->req_pool[i]);
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return 0;
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} /* end of snic_cleanup */
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static void
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snic_iounmap(struct snic *snic)
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{
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if (snic->bar0.vaddr)
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iounmap(snic->bar0.vaddr);
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}
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/*
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* snic_vdev_open_done : polls for svnic_dev_open cmd completion.
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*/
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static int
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snic_vdev_open_done(struct vnic_dev *vdev, int *done)
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{
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struct snic *snic = svnic_dev_priv(vdev);
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int ret;
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int nretries = 5;
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do {
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ret = svnic_dev_open_done(vdev, done);
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if (ret == 0)
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break;
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SNIC_HOST_INFO(snic->shost, "VNIC_DEV_OPEN Timedout.\n");
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} while (nretries--);
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return ret;
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} /* end of snic_vdev_open_done */
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/*
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* snic_add_host : registers scsi host with ML
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*/
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static int
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snic_add_host(struct Scsi_Host *shost, struct pci_dev *pdev)
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{
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int ret = 0;
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ret = scsi_add_host(shost, &pdev->dev);
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if (ret) {
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SNIC_HOST_ERR(shost,
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"snic: scsi_add_host failed. %d\n",
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ret);
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return ret;
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}
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SNIC_BUG_ON(shost->work_q != NULL);
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snprintf(shost->work_q_name, sizeof(shost->work_q_name), "scsi_wq_%d",
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shost->host_no);
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shost->work_q = create_singlethread_workqueue(shost->work_q_name);
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if (!shost->work_q) {
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SNIC_HOST_ERR(shost, "Failed to Create ScsiHost wq.\n");
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ret = -ENOMEM;
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}
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return ret;
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} /* end of snic_add_host */
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static void
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snic_del_host(struct Scsi_Host *shost)
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{
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if (!shost->work_q)
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return;
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destroy_workqueue(shost->work_q);
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shost->work_q = NULL;
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scsi_remove_host(shost);
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}
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int
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snic_get_state(struct snic *snic)
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{
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return atomic_read(&snic->state);
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}
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void
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snic_set_state(struct snic *snic, enum snic_state state)
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{
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SNIC_HOST_INFO(snic->shost, "snic state change from %s to %s\n",
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snic_state_to_str(snic_get_state(snic)),
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snic_state_to_str(state));
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atomic_set(&snic->state, state);
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}
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/*
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* snic_probe : Initialize the snic interface.
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*/
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static int
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snic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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struct Scsi_Host *shost;
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struct snic *snic;
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mempool_t *pool;
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unsigned long flags;
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u32 max_ios = 0;
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int ret, i;
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/* Device Information */
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SNIC_INFO("snic device %4x:%4x:%4x:%4x: ",
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pdev->vendor, pdev->device, pdev->subsystem_vendor,
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pdev->subsystem_device);
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SNIC_INFO("snic device bus %x: slot %x: fn %x\n",
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pdev->bus->number, PCI_SLOT(pdev->devfn),
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PCI_FUNC(pdev->devfn));
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/*
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* Allocate SCSI Host and setup association between host, and snic
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*/
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shost = scsi_host_alloc(&snic_host_template, sizeof(struct snic));
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if (!shost) {
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SNIC_ERR("Unable to alloc scsi_host\n");
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ret = -ENOMEM;
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goto prob_end;
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}
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snic = shost_priv(shost);
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snic->shost = shost;
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snprintf(snic->name, sizeof(snic->name) - 1, "%s%d", SNIC_DRV_NAME,
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shost->host_no);
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SNIC_HOST_INFO(shost,
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"snic%d = %p shost = %p device bus %x: slot %x: fn %x\n",
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shost->host_no, snic, shost, pdev->bus->number,
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PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
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#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
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/* Per snic debugfs init */
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snic_stats_debugfs_init(snic);
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#endif
|
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|
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/* Setup PCI Resources */
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pci_set_drvdata(pdev, snic);
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snic->pdev = pdev;
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|
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ret = pci_enable_device(pdev);
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if (ret) {
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SNIC_HOST_ERR(shost,
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"Cannot enable PCI Resources, aborting : %d\n",
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ret);
|
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|
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goto err_free_snic;
|
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}
|
|
|
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ret = pci_request_regions(pdev, SNIC_DRV_NAME);
|
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if (ret) {
|
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SNIC_HOST_ERR(shost,
|
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"Cannot obtain PCI Resources, aborting : %d\n",
|
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ret);
|
|
|
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goto err_pci_disable;
|
|
}
|
|
|
|
pci_set_master(pdev);
|
|
|
|
/*
|
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* Query PCI Controller on system for DMA addressing
|
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* limitation for the device. Try 43-bit first, and
|
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* fail to 32-bit.
|
|
*/
|
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ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(43));
|
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if (ret) {
|
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ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
|
|
if (ret) {
|
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SNIC_HOST_ERR(shost,
|
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"No Usable DMA Configuration, aborting %d\n",
|
|
ret);
|
|
goto err_rel_regions;
|
|
}
|
|
}
|
|
|
|
/* Map vNIC resources from BAR0 */
|
|
if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
|
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SNIC_HOST_ERR(shost, "BAR0 not memory mappable aborting.\n");
|
|
|
|
ret = -ENODEV;
|
|
goto err_rel_regions;
|
|
}
|
|
|
|
snic->bar0.vaddr = pci_iomap(pdev, 0, 0);
|
|
if (!snic->bar0.vaddr) {
|
|
SNIC_HOST_ERR(shost,
|
|
"Cannot memory map BAR0 res hdr aborting.\n");
|
|
|
|
ret = -ENODEV;
|
|
goto err_rel_regions;
|
|
}
|
|
|
|
snic->bar0.bus_addr = pci_resource_start(pdev, 0);
|
|
snic->bar0.len = pci_resource_len(pdev, 0);
|
|
SNIC_BUG_ON(snic->bar0.bus_addr == 0);
|
|
|
|
/* Devcmd2 Resource Allocation and Initialization */
|
|
snic->vdev = svnic_dev_alloc_discover(NULL, snic, pdev, &snic->bar0, 1);
|
|
if (!snic->vdev) {
|
|
SNIC_HOST_ERR(shost, "vNIC Resource Discovery Failed.\n");
|
|
|
|
ret = -ENODEV;
|
|
goto err_iounmap;
|
|
}
|
|
|
|
ret = svnic_dev_cmd_init(snic->vdev, 0);
|
|
if (ret) {
|
|
SNIC_HOST_INFO(shost, "Devcmd2 Init Failed. err = %d\n", ret);
|
|
|
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goto err_vnic_unreg;
|
|
}
|
|
|
|
ret = snic_dev_wait(snic->vdev, svnic_dev_open, snic_vdev_open_done, 0);
|
|
if (ret) {
|
|
SNIC_HOST_ERR(shost,
|
|
"vNIC dev open failed, aborting. %d\n",
|
|
ret);
|
|
|
|
goto err_vnic_unreg;
|
|
}
|
|
|
|
ret = svnic_dev_init(snic->vdev, 0);
|
|
if (ret) {
|
|
SNIC_HOST_ERR(shost,
|
|
"vNIC dev init failed. aborting. %d\n",
|
|
ret);
|
|
|
|
goto err_dev_close;
|
|
}
|
|
|
|
/* Get vNIC information */
|
|
ret = snic_get_vnic_config(snic);
|
|
if (ret) {
|
|
SNIC_HOST_ERR(shost,
|
|
"Get vNIC configuration failed, aborting. %d\n",
|
|
ret);
|
|
|
|
goto err_dev_close;
|
|
}
|
|
|
|
/* Configure Maximum Outstanding IO reqs */
|
|
max_ios = snic->config.io_throttle_count;
|
|
if (max_ios != SNIC_UCSM_DFLT_THROTTLE_CNT_BLD)
|
|
shost->can_queue = min_t(u32, SNIC_MAX_IO_REQ,
|
|
max_t(u32, SNIC_MIN_IO_REQ, max_ios));
|
|
|
|
snic->max_tag_id = shost->can_queue;
|
|
|
|
shost->max_lun = snic->config.luns_per_tgt;
|
|
shost->max_id = SNIC_MAX_TARGET;
|
|
|
|
shost->max_cmd_len = MAX_COMMAND_SIZE; /*defined in scsi_cmnd.h*/
|
|
|
|
snic_get_res_counts(snic);
|
|
|
|
/*
|
|
* Assumption: Only MSIx is supported
|
|
*/
|
|
ret = snic_set_intr_mode(snic);
|
|
if (ret) {
|
|
SNIC_HOST_ERR(shost,
|
|
"Failed to set intr mode aborting. %d\n",
|
|
ret);
|
|
|
|
goto err_dev_close;
|
|
}
|
|
|
|
ret = snic_alloc_vnic_res(snic);
|
|
if (ret) {
|
|
SNIC_HOST_ERR(shost,
|
|
"Failed to alloc vNIC resources aborting. %d\n",
|
|
ret);
|
|
|
|
goto err_clear_intr;
|
|
}
|
|
|
|
/* Initialize specific lists */
|
|
INIT_LIST_HEAD(&snic->list);
|
|
|
|
/*
|
|
* spl_cmd_list for maintaining snic specific cmds
|
|
* such as EXCH_VER_REQ, REPORT_TARGETS etc
|
|
*/
|
|
INIT_LIST_HEAD(&snic->spl_cmd_list);
|
|
spin_lock_init(&snic->spl_cmd_lock);
|
|
|
|
/* initialize all snic locks */
|
|
spin_lock_init(&snic->snic_lock);
|
|
|
|
for (i = 0; i < SNIC_WQ_MAX; i++)
|
|
spin_lock_init(&snic->wq_lock[i]);
|
|
|
|
for (i = 0; i < SNIC_IO_LOCKS; i++)
|
|
spin_lock_init(&snic->io_req_lock[i]);
|
|
|
|
pool = mempool_create_slab_pool(2,
|
|
snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]);
|
|
if (!pool) {
|
|
SNIC_HOST_ERR(shost, "dflt sgl pool creation failed\n");
|
|
|
|
ret = -ENOMEM;
|
|
goto err_free_res;
|
|
}
|
|
|
|
snic->req_pool[SNIC_REQ_CACHE_DFLT_SGL] = pool;
|
|
|
|
pool = mempool_create_slab_pool(2,
|
|
snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]);
|
|
if (!pool) {
|
|
SNIC_HOST_ERR(shost, "max sgl pool creation failed\n");
|
|
|
|
ret = -ENOMEM;
|
|
goto err_free_dflt_sgl_pool;
|
|
}
|
|
|
|
snic->req_pool[SNIC_REQ_CACHE_MAX_SGL] = pool;
|
|
|
|
pool = mempool_create_slab_pool(2,
|
|
snic_glob->req_cache[SNIC_REQ_TM_CACHE]);
|
|
if (!pool) {
|
|
SNIC_HOST_ERR(shost, "snic tmreq info pool creation failed.\n");
|
|
|
|
ret = -ENOMEM;
|
|
goto err_free_max_sgl_pool;
|
|
}
|
|
|
|
snic->req_pool[SNIC_REQ_TM_CACHE] = pool;
|
|
|
|
/* Initialize snic state */
|
|
atomic_set(&snic->state, SNIC_INIT);
|
|
|
|
atomic_set(&snic->ios_inflight, 0);
|
|
|
|
/* Setup notification buffer area */
|
|
ret = snic_notify_set(snic);
|
|
if (ret) {
|
|
SNIC_HOST_ERR(shost,
|
|
"Failed to alloc notify buffer aborting. %d\n",
|
|
ret);
|
|
|
|
goto err_free_tmreq_pool;
|
|
}
|
|
|
|
spin_lock_irqsave(&snic_glob->snic_list_lock, flags);
|
|
list_add_tail(&snic->list, &snic_glob->snic_list);
|
|
spin_unlock_irqrestore(&snic_glob->snic_list_lock, flags);
|
|
|
|
snic_disc_init(&snic->disc);
|
|
INIT_WORK(&snic->tgt_work, snic_handle_tgt_disc);
|
|
INIT_WORK(&snic->disc_work, snic_handle_disc);
|
|
INIT_WORK(&snic->link_work, snic_handle_link);
|
|
|
|
/* Enable all queues */
|
|
for (i = 0; i < snic->wq_count; i++)
|
|
svnic_wq_enable(&snic->wq[i]);
|
|
|
|
ret = svnic_dev_enable_wait(snic->vdev);
|
|
if (ret) {
|
|
SNIC_HOST_ERR(shost,
|
|
"vNIC dev enable failed w/ error %d\n",
|
|
ret);
|
|
|
|
goto err_vdev_enable;
|
|
}
|
|
|
|
ret = snic_request_intr(snic);
|
|
if (ret) {
|
|
SNIC_HOST_ERR(shost, "Unable to request irq. %d\n", ret);
|
|
|
|
goto err_req_intr;
|
|
}
|
|
|
|
for (i = 0; i < snic->intr_count; i++)
|
|
svnic_intr_unmask(&snic->intr[i]);
|
|
|
|
/* Get snic params */
|
|
ret = snic_get_conf(snic);
|
|
if (ret) {
|
|
SNIC_HOST_ERR(shost,
|
|
"Failed to get snic io config from FW w err %d\n",
|
|
ret);
|
|
|
|
goto err_get_conf;
|
|
}
|
|
|
|
/*
|
|
* Initialization done with PCI system, hardware, firmware.
|
|
* Add shost to SCSI
|
|
*/
|
|
ret = snic_add_host(shost, pdev);
|
|
if (ret) {
|
|
SNIC_HOST_ERR(shost,
|
|
"Adding scsi host Failed ... exiting. %d\n",
|
|
ret);
|
|
|
|
goto err_get_conf;
|
|
}
|
|
|
|
snic_set_state(snic, SNIC_ONLINE);
|
|
|
|
ret = snic_disc_start(snic);
|
|
if (ret) {
|
|
SNIC_HOST_ERR(shost, "snic_probe:Discovery Failed w err = %d\n",
|
|
ret);
|
|
|
|
goto err_get_conf;
|
|
}
|
|
|
|
SNIC_HOST_INFO(shost, "SNIC Device Probe Successful.\n");
|
|
|
|
return 0;
|
|
|
|
err_get_conf:
|
|
snic_free_all_untagged_reqs(snic);
|
|
|
|
for (i = 0; i < snic->intr_count; i++)
|
|
svnic_intr_mask(&snic->intr[i]);
|
|
|
|
snic_free_intr(snic);
|
|
|
|
err_req_intr:
|
|
svnic_dev_disable(snic->vdev);
|
|
|
|
err_vdev_enable:
|
|
svnic_dev_notify_unset(snic->vdev);
|
|
|
|
for (i = 0; i < snic->wq_count; i++) {
|
|
int rc = 0;
|
|
|
|
rc = svnic_wq_disable(&snic->wq[i]);
|
|
if (rc) {
|
|
SNIC_HOST_ERR(shost,
|
|
"WQ Disable Failed w/ err = %d\n", rc);
|
|
|
|
break;
|
|
}
|
|
}
|
|
snic_del_host(snic->shost);
|
|
|
|
err_free_tmreq_pool:
|
|
mempool_destroy(snic->req_pool[SNIC_REQ_TM_CACHE]);
|
|
|
|
err_free_max_sgl_pool:
|
|
mempool_destroy(snic->req_pool[SNIC_REQ_CACHE_MAX_SGL]);
|
|
|
|
err_free_dflt_sgl_pool:
|
|
mempool_destroy(snic->req_pool[SNIC_REQ_CACHE_DFLT_SGL]);
|
|
|
|
err_free_res:
|
|
snic_free_vnic_res(snic);
|
|
|
|
err_clear_intr:
|
|
snic_clear_intr_mode(snic);
|
|
|
|
err_dev_close:
|
|
svnic_dev_close(snic->vdev);
|
|
|
|
err_vnic_unreg:
|
|
svnic_dev_unregister(snic->vdev);
|
|
|
|
err_iounmap:
|
|
snic_iounmap(snic);
|
|
|
|
err_rel_regions:
|
|
pci_release_regions(pdev);
|
|
|
|
err_pci_disable:
|
|
pci_disable_device(pdev);
|
|
|
|
err_free_snic:
|
|
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
|
|
snic_stats_debugfs_remove(snic);
|
|
#endif
|
|
scsi_host_put(shost);
|
|
pci_set_drvdata(pdev, NULL);
|
|
|
|
prob_end:
|
|
SNIC_INFO("sNIC device : bus %d: slot %d: fn %d Registration Failed.\n",
|
|
pdev->bus->number, PCI_SLOT(pdev->devfn),
|
|
PCI_FUNC(pdev->devfn));
|
|
|
|
return ret;
|
|
} /* end of snic_probe */
|
|
|
|
|
|
/*
|
|
* snic_remove : invoked on unbinding the interface to cleanup the
|
|
* resources allocated in snic_probe on initialization.
|
|
*/
|
|
static void
|
|
snic_remove(struct pci_dev *pdev)
|
|
{
|
|
struct snic *snic = pci_get_drvdata(pdev);
|
|
unsigned long flags;
|
|
|
|
if (!snic) {
|
|
SNIC_INFO("sNIC dev: bus %d slot %d fn %d snic inst is null.\n",
|
|
pdev->bus->number, PCI_SLOT(pdev->devfn),
|
|
PCI_FUNC(pdev->devfn));
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Mark state so that the workqueue thread stops forwarding
|
|
* received frames and link events. ISR and other threads
|
|
* that can queue work items will also stop creating work
|
|
* items on the snic workqueue
|
|
*/
|
|
snic_set_state(snic, SNIC_OFFLINE);
|
|
spin_lock_irqsave(&snic->snic_lock, flags);
|
|
snic->stop_link_events = 1;
|
|
spin_unlock_irqrestore(&snic->snic_lock, flags);
|
|
|
|
flush_workqueue(snic_glob->event_q);
|
|
snic_disc_term(snic);
|
|
|
|
spin_lock_irqsave(&snic->snic_lock, flags);
|
|
snic->in_remove = 1;
|
|
spin_unlock_irqrestore(&snic->snic_lock, flags);
|
|
|
|
/*
|
|
* This stops the snic device, masks all interrupts, Completed
|
|
* CQ entries are drained. Posted WQ/RQ/Copy-WQ entries are
|
|
* cleanup
|
|
*/
|
|
snic_cleanup(snic);
|
|
|
|
spin_lock_irqsave(&snic_glob->snic_list_lock, flags);
|
|
list_del(&snic->list);
|
|
spin_unlock_irqrestore(&snic_glob->snic_list_lock, flags);
|
|
|
|
snic_tgt_del_all(snic);
|
|
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
|
|
snic_stats_debugfs_remove(snic);
|
|
#endif
|
|
snic_del_host(snic->shost);
|
|
|
|
svnic_dev_notify_unset(snic->vdev);
|
|
snic_free_intr(snic);
|
|
snic_free_vnic_res(snic);
|
|
snic_clear_intr_mode(snic);
|
|
svnic_dev_close(snic->vdev);
|
|
svnic_dev_unregister(snic->vdev);
|
|
snic_iounmap(snic);
|
|
pci_release_regions(pdev);
|
|
pci_disable_device(pdev);
|
|
pci_set_drvdata(pdev, NULL);
|
|
|
|
/* this frees Scsi_Host and snic memory (continuous chunk) */
|
|
scsi_host_put(snic->shost);
|
|
} /* end of snic_remove */
|
|
|
|
|
|
struct snic_global *snic_glob;
|
|
|
|
/*
|
|
* snic_global_data_init: Initialize SNIC Global Data
|
|
* Notes: All the global lists, variables should be part of global data
|
|
* this helps in debugging.
|
|
*/
|
|
static int
|
|
snic_global_data_init(void)
|
|
{
|
|
int ret = 0;
|
|
struct kmem_cache *cachep;
|
|
ssize_t len = 0;
|
|
|
|
snic_glob = kzalloc(sizeof(*snic_glob), GFP_KERNEL);
|
|
|
|
if (!snic_glob) {
|
|
SNIC_ERR("Failed to allocate Global Context.\n");
|
|
|
|
ret = -ENOMEM;
|
|
goto gdi_end;
|
|
}
|
|
|
|
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
|
|
/* Debugfs related Initialization */
|
|
/* Create debugfs entries for snic */
|
|
snic_debugfs_init();
|
|
|
|
/* Trace related Initialization */
|
|
/* Allocate memory for trace buffer */
|
|
ret = snic_trc_init();
|
|
if (ret < 0) {
|
|
SNIC_ERR("Trace buffer init failed, SNIC tracing disabled\n");
|
|
snic_trc_free();
|
|
/* continue even if it fails */
|
|
}
|
|
|
|
#endif
|
|
INIT_LIST_HEAD(&snic_glob->snic_list);
|
|
spin_lock_init(&snic_glob->snic_list_lock);
|
|
|
|
/* Create a cache for allocation of snic_host_req+default size ESGLs */
|
|
len = sizeof(struct snic_req_info);
|
|
len += sizeof(struct snic_host_req) + sizeof(struct snic_dflt_sgl);
|
|
cachep = kmem_cache_create("snic_req_dfltsgl", len, SNIC_SG_DESC_ALIGN,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!cachep) {
|
|
SNIC_ERR("Failed to create snic default sgl slab\n");
|
|
ret = -ENOMEM;
|
|
|
|
goto err_dflt_req_slab;
|
|
}
|
|
snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL] = cachep;
|
|
|
|
/* Create a cache for allocation of max size Extended SGLs */
|
|
len = sizeof(struct snic_req_info);
|
|
len += sizeof(struct snic_host_req) + sizeof(struct snic_max_sgl);
|
|
cachep = kmem_cache_create("snic_req_maxsgl", len, SNIC_SG_DESC_ALIGN,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!cachep) {
|
|
SNIC_ERR("Failed to create snic max sgl slab\n");
|
|
ret = -ENOMEM;
|
|
|
|
goto err_max_req_slab;
|
|
}
|
|
snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL] = cachep;
|
|
|
|
len = sizeof(struct snic_host_req);
|
|
cachep = kmem_cache_create("snic_req_maxsgl", len, SNIC_SG_DESC_ALIGN,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!cachep) {
|
|
SNIC_ERR("Failed to create snic tm req slab\n");
|
|
ret = -ENOMEM;
|
|
|
|
goto err_tmreq_slab;
|
|
}
|
|
snic_glob->req_cache[SNIC_REQ_TM_CACHE] = cachep;
|
|
|
|
/* snic_event queue */
|
|
snic_glob->event_q = create_singlethread_workqueue("snic_event_wq");
|
|
if (!snic_glob->event_q) {
|
|
SNIC_ERR("snic event queue create failed\n");
|
|
ret = -ENOMEM;
|
|
|
|
goto err_eventq;
|
|
}
|
|
|
|
return ret;
|
|
|
|
err_eventq:
|
|
kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_TM_CACHE]);
|
|
|
|
err_tmreq_slab:
|
|
kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]);
|
|
|
|
err_max_req_slab:
|
|
kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]);
|
|
|
|
err_dflt_req_slab:
|
|
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
|
|
snic_trc_free();
|
|
snic_debugfs_term();
|
|
#endif
|
|
kfree(snic_glob);
|
|
snic_glob = NULL;
|
|
|
|
gdi_end:
|
|
return ret;
|
|
} /* end of snic_glob_init */
|
|
|
|
/*
|
|
* snic_global_data_cleanup : Frees SNIC Global Data
|
|
*/
|
|
static void
|
|
snic_global_data_cleanup(void)
|
|
{
|
|
SNIC_BUG_ON(snic_glob == NULL);
|
|
|
|
destroy_workqueue(snic_glob->event_q);
|
|
kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_TM_CACHE]);
|
|
kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]);
|
|
kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]);
|
|
|
|
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
|
|
/* Freeing Trace Resources */
|
|
snic_trc_free();
|
|
|
|
/* Freeing Debugfs Resources */
|
|
snic_debugfs_term();
|
|
#endif
|
|
kfree(snic_glob);
|
|
snic_glob = NULL;
|
|
} /* end of snic_glob_cleanup */
|
|
|
|
static struct pci_driver snic_driver = {
|
|
.name = SNIC_DRV_NAME,
|
|
.id_table = snic_id_table,
|
|
.probe = snic_probe,
|
|
.remove = snic_remove,
|
|
};
|
|
|
|
static int __init
|
|
snic_init_module(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
#ifndef __x86_64__
|
|
SNIC_INFO("SNIC Driver is supported only for x86_64 platforms!\n");
|
|
add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK);
|
|
#endif
|
|
|
|
SNIC_INFO("%s, ver %s\n", SNIC_DRV_DESCRIPTION, SNIC_DRV_VERSION);
|
|
|
|
ret = snic_global_data_init();
|
|
if (ret) {
|
|
SNIC_ERR("Failed to Initialize Global Data.\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
ret = pci_register_driver(&snic_driver);
|
|
if (ret < 0) {
|
|
SNIC_ERR("PCI driver register error\n");
|
|
|
|
goto err_pci_reg;
|
|
}
|
|
|
|
return ret;
|
|
|
|
err_pci_reg:
|
|
snic_global_data_cleanup();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit
|
|
snic_cleanup_module(void)
|
|
{
|
|
pci_unregister_driver(&snic_driver);
|
|
snic_global_data_cleanup();
|
|
}
|
|
|
|
module_init(snic_init_module);
|
|
module_exit(snic_cleanup_module);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION(SNIC_DRV_DESCRIPTION);
|
|
MODULE_VERSION(SNIC_DRV_VERSION);
|
|
MODULE_DEVICE_TABLE(pci, snic_id_table);
|
|
MODULE_AUTHOR("Narsimhulu Musini <nmusini@cisco.com>, "
|
|
"Sesidhar Baddela <sebaddel@cisco.com>");
|