Hi Narsimhulu,
please find some comments inline.
On 04/09/2015 01:49 PM, Narsimhulu Musini wrote:
> snic_disc.h contains snic target structure definition.
>
> snic_disc.c contains target discovery, setup, lookup, and cleanup
>
> snic_ctl.c contains retrieval of snic capabilities includes
> max ios, size, SGs per request, and max concurrent requests.
>
> Signed-off-by: Narsimhulu Musini <nmus...@cisco.com>
> Signed-off-by: Sesidhar Baddela <sebad...@cisco.com>
> ---
> * v3
> - Cleaned up redundant comment.
>
> drivers/scsi/snic/snic_ctl.c | 276 +++++++++++++++++++
> drivers/scsi/snic/snic_disc.c | 602
> ++++++++++++++++++++++++++++++++++++++++++
> drivers/scsi/snic/snic_disc.h | 124 +++++++++
> 3 files changed, 1002 insertions(+)
> create mode 100644 drivers/scsi/snic/snic_ctl.c
> create mode 100644 drivers/scsi/snic/snic_disc.c
> create mode 100644 drivers/scsi/snic/snic_disc.h
>
> diff --git a/drivers/scsi/snic/snic_ctl.c b/drivers/scsi/snic/snic_ctl.c
> new file mode 100644
> index 0000000..4bc55be
> --- /dev/null
> +++ b/drivers/scsi/snic/snic_ctl.c
> @@ -0,0 +1,276 @@
> +/*
> + * 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/pci.h>
> +#include <linux/slab.h>
> +
> +#include <linux/interrupt.h>
> +#include <linux/workqueue.h>
> +#include <linux/spinlock.h>
> +#include <linux/mempool.h>
> +#include <scsi/scsi_tcq.h>
> +#include <linux/ctype.h>
> +
> +#include "snic_io.h"
> +#include "snic.h"
> +#include "cq_enet_desc.h"
> +#include "snic_fwint.h"
> +
> +/*
> + * snic_handle_link : Handles link flaps.
> + */
> +void
> +snic_handle_link(struct work_struct *work)
> +{
> + struct snic *snic = container_of(work, struct snic, link_work);
> +
> + if (snic->config.xpt_type != SNIC_DAS) {
> + SNIC_HOST_INFO(snic->shost, "Link Event Received.\n");
> + SNIC_ASSERT_NOT_IMPL(1);
> +
> + return;
> + }
> +
> + snic->link_status = vnic_dev_link_status(snic->vdev);
> + snic->link_down_cnt = vnic_dev_link_down_cnt(snic->vdev);
> + SNIC_HOST_INFO(snic->shost, "Link Event: Link %s.\n",
> + ((snic->link_status) ? "Up" : "Down"));
> +}
> +
> +
> +/*
> + * snic_ver_enc : Encodes version str to int
> + * version string is similar to netmask string
> + */
> +static int
> +snic_ver_enc(const char *s)
> +{
> + int v[4] = {0};
> + int i = 0, x = 0;
> + char c;
> + const char *p = s;
> +
> + /* validate version string */
> + if ((strlen(s) > 15) || (strlen(s) < 7))
> + goto end;
> +
> + while ((c = *p++)) {
> + if (c == '.') {
> + i++;
> + continue;
> + }
> +
> + if (i > 4 || !isdigit(c))
> + goto end;
> +
> + v[i] = v[i] * 10 + (c - '0');
> + }
> +
> + /* validate sub version numbers */
> + for (i = 3; i >= 0; i--)
> + if (v[i] > 0xff)
> + goto end;
> +
> + x |= (v[0] << 24) | v[1] << 16 | v[2] << 8 | v[3];
> +
> +end:
> + if (x == 0) {
> + SNIC_ERR("Invalid version string [%s].\n", s);
> +
> + return -1;
> + }
> +
> + return x;
> +} /* end of snic_ver_enc */
> +
> +/*
> + * snic_qeueue_exch_ver_req :
> + *
> + * Queues Exchange Version Request, to communicate host information
> + * in return, it gets firmware version details
> + */
> +int
> +snic_queue_exch_ver_req(struct snic *snic)
> +{
> + struct snic_req_info *rqi = NULL;
> + struct snic_host_req *req = NULL;
> + int ret = 0;
> +
> + SNIC_HOST_INFO(snic->shost, "Exch Ver Req Preparing...\n");
> +
> + rqi = snic_req_init(snic, 0);
> + if (!rqi) {
> + SNIC_HOST_ERR(snic->shost,
> + "Queuing Exch Ver Req failed, err = %d\n",
> + ret);
> +
> + ret = -ENOMEM;
> + goto error;
> + }
> +
> + req = rqi_to_req(rqi);
> +
> + /* Initialize snic_host_req */
> + snic_io_hdr_enc(&req->hdr, SNIC_REQ_EXCH_VER, 0, SCSI_NO_TAG,
> + snic->config.hid, 0, (u64)rqi);
> + req->u.exch_ver.drvr_ver = snic_ver_enc(SNIC_DRV_VERSION);
> + req->u.exch_ver.os_type = SNIC_OS_LINUX;
> +
> + snic_handle_untagged_req(snic, rqi);
> +
> + ret = snic_queue_wq_desc(snic, req, sizeof(*req));
> + if (ret) {
> + snic_release_untagged_req(snic, rqi);
> + SNIC_HOST_ERR(snic->shost,
> + "Queuing Exch Ver Req failed, err = %d\n",
> + ret);
> + goto error;
> + }
> +
> + SNIC_HOST_INFO(snic->shost, "Exch Ver Req is issued. ret = %d\n", ret);
> +
> +error:
> + return ret;
> +} /* end of snic_queue_exch_ver_req */
> +
> +/*
> + * snic_io_exch_ver_cmpl_handler
> + */
> +int
> +snic_io_exch_ver_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
> +{
> + struct snic_req_info *rqi = NULL;
> + u8 typ, hdr_stat;
> + u32 cmnd_id, hid, max_sgs;
> + u64 ctx = 0;
> + unsigned long flags;
> + int ret = 0;
> +
> + SNIC_HOST_INFO(snic->shost, "Exch Ver Compl Received.\n");
> + snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx);
> + SNIC_BUG_ON(snic->config.hid != hid);
> + rqi = (struct snic_req_info *) ctx;
> +
> + if (hdr_stat) {
> + SNIC_HOST_ERR(snic->shost,
> + "Exch Ver Completed w/ err status %d\n",
> + hdr_stat);
> +
> + goto exch_cmpl_end;
> + }
> +
> + spin_lock_irqsave(&snic->snic_lock, flags);
> + snic->fwinfo.fw_ver = fwreq->u.exch_ver_cmpl.version;
> + snic->fwinfo.hid = fwreq->u.exch_ver_cmpl.hid;
> + snic->fwinfo.max_concur_ios = fwreq->u.exch_ver_cmpl.max_concur_ios;
> + snic->fwinfo.max_sgs_per_cmd = fwreq->u.exch_ver_cmpl.max_sgs_per_cmd;
> + snic->fwinfo.max_io_sz = fwreq->u.exch_ver_cmpl.max_io_sz;
> + snic->fwinfo.max_tgts = fwreq->u.exch_ver_cmpl.max_tgts;
> + snic->fwinfo.io_tmo = fwreq->u.exch_ver_cmpl.io_timeout;
> +
> + SNIC_HOST_INFO(snic->shost,
> + "vers %u hid %u max_concur_ios %u max_sgs_per_cmd %u
> max_io_sz %u max_tgts %u fw tmo %u\n",
> + fwreq->u.exch_ver_cmpl.version,
> + fwreq->u.exch_ver_cmpl.hid,
> + fwreq->u.exch_ver_cmpl.max_concur_ios,
> + fwreq->u.exch_ver_cmpl.max_sgs_per_cmd,
> + fwreq->u.exch_ver_cmpl.max_io_sz,
> + fwreq->u.exch_ver_cmpl.max_tgts,
> + fwreq->u.exch_ver_cmpl.io_timeout);
> +
> + SNIC_HOST_INFO(snic->shost,
> + "HBA Capabilities = 0x%x\n",
> + fwreq->u.exch_ver_cmpl.hba_cap);
> +
> + /* Updating SGList size */
> + max_sgs = snic->fwinfo.max_sgs_per_cmd;
> + if (max_sgs && max_sgs < SNIC_MAX_SG_DESC_CNT) {
> + snic->shost->sg_tablesize = max_sgs;
> + SNIC_HOST_INFO(snic->shost, "Max SGs set to %d\n",
> + snic->shost->sg_tablesize);
> + } else if (max_sgs > snic->shost->sg_tablesize) {
> + SNIC_HOST_INFO(snic->shost,
> + "Target type %d Supports Larger Max SGList %d
> than driver's Max SG List %d.\n",
> + snic->config.xpt_type, max_sgs,
> + snic->shost->sg_tablesize);
> + }
> +
> + if (snic->shost->can_queue > snic->fwinfo.max_concur_ios)
> + snic->shost->can_queue = snic->fwinfo.max_concur_ios;
> +
> + snic->shost->max_sectors = snic->fwinfo.max_io_sz >> 9;
> + if (snic->fwinfo.wait)
> + complete(snic->fwinfo.wait);
> +
> + spin_unlock_irqrestore(&snic->snic_lock, flags);
> +
> +exch_cmpl_end:
> + snic_release_untagged_req(snic, rqi);
> +
> + SNIC_HOST_INFO(snic->shost, "Exch_cmpl Done, hdr_stat %d.\n", hdr_stat);
> +
> + return ret;
> +} /* end of snic_io_exch_ver_cmpl_handler */
> +
> +/*
> + * snic_get_conf
> + *
> + * Synchronous call, and Retrieves snic params.
> + */
> +int
> +snic_get_conf(struct snic *snic)
> +{
> + DECLARE_COMPLETION_ONSTACK(wait);
> + unsigned long flags;
> + int ret;
> + int nr_retries = 3;
> +
> + SNIC_HOST_INFO(snic->shost, "Retrieving snic params.\n");
> + spin_lock_irqsave(&snic->snic_lock, flags);
> + memset(&snic->fwinfo, 0, sizeof(snic->fwinfo));
> + snic->fwinfo.wait = &wait;
> + spin_unlock_irqrestore(&snic->snic_lock, flags);
> +
> + /* Additional delay to handle HW Resource initialization. */
> + msleep(50);
> +
> + /*
> + * Exch ver req can be ignored by FW, if HW Resource initialization
> + * is in progress, Hence retry.
> + */
> + do {
> + ret = snic_queue_exch_ver_req(snic);
> + if (ret)
> + return ret;
> +
> + wait_for_completion_timeout(&wait, msecs_to_jiffies(2000));
> + spin_lock_irqsave(&snic->snic_lock, flags);
> + ret = (snic->fwinfo.fw_ver != 0) ? 0 : -ETIMEDOUT;
> + if (ret)
> + SNIC_HOST_ERR(snic->shost,
> + "Failed to retrieve snic params,\n");
> +
> + /* Unset fwinfo.wait, on success or on last retry */
> + if (ret == 0 || nr_retries == 1)
> + snic->fwinfo.wait = NULL;
> +
> + spin_unlock_irqrestore(&snic->snic_lock, flags);
> + } while (ret && --nr_retries);
> +
> + return ret;
> +} /* end of snic_get_info */
> diff --git a/drivers/scsi/snic/snic_disc.c b/drivers/scsi/snic/snic_disc.c
> new file mode 100644
> index 0000000..b6b6cca
> --- /dev/null
> +++ b/drivers/scsi/snic/snic_disc.c
> @@ -0,0 +1,602 @@
> +/*
> + * 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/mempool.h>
> +
> +#include <scsi/scsi_tcq.h>
> +
> +#include "snic_disc.h"
> +#include "snic.h"
> +#include "snic_io.h"
> +
> +
> +/* snic target types */
> +static const char * const snic_tgt_type_str[] = {
> + [SNIC_TGT_DAS] = "DAS",
> + [SNIC_TGT_SAN] = "SAN",
> +};
> +
> +static inline const char *
> +snic_tgt_type_to_str(int typ)
> +{
> + return ((typ > SNIC_TGT_NONE && typ <= SNIC_TGT_SAN) ?
> + snic_tgt_type_str[typ] : "Unknown");
> +}
> +
> +static const char * const snic_tgt_state_str[] = {
> + [SNIC_TGT_STAT_INIT] = "INIT",
> + [SNIC_TGT_STAT_ONLINE] = "ONLINE",
> + [SNIC_TGT_STAT_OFFLINE] = "OFFLINE",
> + [SNIC_TGT_STAT_DEL] = "DELETION IN PROGRESS",
> +};
> +
> +const char *
> +snic_tgt_state_to_str(int state)
> +{
> + return ((state >= SNIC_TGT_STAT_INIT && state <= SNIC_TGT_STAT_DEL) ?
> + snic_tgt_state_str[state] : "UNKNOWN");
> +}
> +
> +/*
> + * Initiate report_tgt req desc
> + */
> +static void
> +snic_report_tgt_init(struct snic_host_req *req, u32 hid, u8 *buf, u32 len,
> + u64 rsp_buf_pa, u64 ctx)
> +{
> + struct snic_sg_desc *sgd = NULL;
> +
> +
> + snic_io_hdr_enc(&req->hdr, SNIC_REQ_REPORT_TGTS, 0, SCSI_NO_TAG, hid,
> + 1, ctx);
> +
> + req->u.rpt_tgts.sg_cnt = 1;
> + sgd = req_to_sgl(req);
> + sgd[0].addr = cpu_to_le64(rsp_buf_pa);
> + sgd[0].len = cpu_to_le32(len);
> + sgd[0]._resvd = 0;
> + req->u.rpt_tgts.sg_addr = (u64) sgd;
> +}
> +
> +/*
> + * snic_queue_report_tgt_req: Queues report target request.
> + */
> +static int
> +snic_queue_report_tgt_req(struct snic *snic)
> +{
> + struct snic_req_info *rqi = NULL;
> + u32 ntgts, buf_len = 0;
> + u8 *buf = NULL;
> + dma_addr_t pa = 0;
> + int ret = 0;
> +
> + rqi = snic_req_init(snic, 1);
> + if (!rqi) {
> + ret = -ENOMEM;
> + goto error;
> + }
> +
> + if (snic->fwinfo.max_tgts)
> + ntgts = min_t(u32, snic->fwinfo.max_tgts, snic->shost->max_id);
> + else
> + ntgts = snic->shost->max_id;
> +
> + /* Allocate Response Buffer */
> + SNIC_BUG_ON(ntgts == 0);
> + buf_len = ntgts * sizeof(struct snic_tgt_id) + SNIC_SG_DESC_ALIGN;
> +
> + buf = kzalloc(buf_len, GFP_KERNEL|GFP_DMA);
> + if (!buf) {
> + snic_req_free(snic, rqi);
> + SNIC_HOST_ERR(snic->shost, "Resp Buf Alloc Failed.\n");
> +
> + ret = -ENOMEM;
> + goto error;
> + }
> +
> + SNIC_BUG_ON((((unsigned long)buf) % SNIC_SG_DESC_ALIGN) != 0);
> +
> + pa = pci_map_single(snic->pdev, buf, buf_len, PCI_DMA_FROMDEVICE);
> + if (pci_dma_mapping_error(snic->pdev, pa)) {
> + kfree(buf);
> + snic_req_free(snic, rqi);
> + SNIC_HOST_ERR(snic->shost,
> + "Rpt-tgt rspbuf %p: PCI DMA Mapping Failed\n",
> + buf);
> + ret = -EINVAL;
> +
> + goto error;
> + }
> +
> +
> + SNIC_BUG_ON(pa == 0);
> + rqi->sge_va = (u64) buf;
> +
> + snic_report_tgt_init(rqi->req,
> + snic->config.hid,
> + buf,
> + buf_len,
> + (u64)pa,
> + (u64)rqi);
> +
> + snic_handle_untagged_req(snic, rqi);
> +
> + ret = snic_queue_wq_desc(snic, rqi->req, rqi->req_len);
> + if (ret) {
> + pci_unmap_single(snic->pdev, pa, buf_len, PCI_DMA_FROMDEVICE);
> + kfree(buf);
> + rqi->sge_va = 0;
> + snic_release_untagged_req(snic, rqi);
> + SNIC_HOST_ERR(snic->shost, "Queuing Report Tgts Failed.\n");
> +
> + goto error;
> + }
> +
> + SNIC_DISC_DBG(snic->shost, "Report Targets Issued.\n");
> +
> + return ret;
> +
> +error:
> + SNIC_HOST_ERR(snic->shost,
> + "Queuing Report Targets Failed, err = %d\n",
> + ret);
> + return ret;
> +} /* end of snic_queue_report_tgt_req */
> +
> +/* call into SML */
> +static void
> +snic_scsi_scan_tgt(struct work_struct *work)
> +{
> + struct snic_tgt *tgt = container_of(work, struct snic_tgt, scan_work);
> + struct Scsi_Host *shost = dev_to_shost(&tgt->dev);
> + unsigned long flags;
> +
> + SNIC_HOST_INFO(shost, "Scanning Target id 0x%x\n", tgt->id);
> + scsi_scan_target(&tgt->dev,
> + tgt->channel,
> + tgt->scsi_tgt_id,
> + SCAN_WILD_CARD,
> + 1);
> +
> + spin_lock_irqsave(shost->host_lock, flags);
> + tgt->flags &= ~SNIC_TGT_SCAN_PENDING;
> + spin_unlock_irqrestore(shost->host_lock, flags);
> +} /* end of snic_scsi_scan_tgt */
> +
> +/*
> + * snic_tgt_lookup :
> + */
> +static struct snic_tgt *
> +snic_tgt_lookup(struct snic *snic, struct snic_tgt_id *tgtid)
> +{
> + struct list_head *cur, *nxt;
> + struct snic_tgt *tgt = NULL;
> +
> + list_for_each_safe(cur, nxt, &snic->disc.tgt_list) {
> + tgt = list_entry(cur, struct snic_tgt, list);
> + if (tgt->id == tgtid->tgt_id)
> + return tgt;
> + tgt = NULL;
> + }
> +
> + return tgt;
> +} /* end of snic_tgt_lookup */
> +
> +/*
> + * snic_tgt_dev_release : Called on dropping last ref for snic_tgt object
> + */
> +void
> +snic_tgt_dev_release(struct device *dev)
> +{
> + struct snic_tgt *tgt = dev_to_tgt(dev);
> +
> + SNIC_HOST_INFO(snic_tgt_to_shost(tgt),
> + "Target Device ID %d (%s) Permanently Deleted.\n",
> + tgt->id,
> + dev_name(dev));
> +
> + SNIC_BUG_ON(!list_empty(&tgt->list));
> + kfree(tgt);
> +}
> +
> +/*
> + * snic_tgt_del : work function to delete snic_tgt
> + */
> +static void
> +snic_tgt_del(struct work_struct *work)
> +{
> + struct snic_tgt *tgt = container_of(work, struct snic_tgt, del_work);
> + struct Scsi_Host *shost = snic_tgt_to_shost(tgt);
> +
> + if (tgt->flags & SNIC_TGT_SCAN_PENDING)
> + scsi_flush_work(shost);
> +
> + /* Block IOs on child devices, stops new IOs */
> + scsi_target_block(&tgt->dev);
> +
> + /* Cleanup IOs */
> + snic_tgt_scsi_abort_io(tgt);
> +
> + /* Unblock IOs now, to flush if there are any. */
> + scsi_target_unblock(&tgt->dev, SDEV_TRANSPORT_OFFLINE);
> +
> + /* Delete SCSI Target and sdevs */
> + scsi_remove_target(&tgt->dev); /* ?? */
> + device_del(&tgt->dev);
> + put_device(&tgt->dev);
> +} /* end of snic_tgt_del */
> +
> +/* snic_tgt_create: checks for existence of snic_tgt, if it doesn't
> + * it creates one.
> + */
> +static struct snic_tgt *
> +snic_tgt_create(struct snic *snic, struct snic_tgt_id *tgtid)
> +{
> + struct snic_tgt *tgt = NULL;
> + unsigned long flags;
> + int ret;
> +
> + tgt = snic_tgt_lookup(snic, tgtid);
> + if (tgt) {
> + /* update the information if required */
> + return tgt;
> + }
> +
> + tgt = kzalloc(sizeof(*tgt), GFP_KERNEL);
> + if (!tgt) {
> + SNIC_HOST_ERR(snic->shost, "Failure to allocate snic_tgt.\n");
> + ret = -ENOMEM;
> +
> + return tgt;
> + }
> +
> + INIT_LIST_HEAD(&tgt->list);
> + tgt->id = tgtid->tgt_id;
> + tgt->channel = 0;
> +
> + SNIC_BUG_ON(tgtid->tgt_type > SNIC_TGT_SAN);
> + tgt->tdata.typ = tgtid->tgt_type;
> +
> + /*
> + * Plugging into SML Device Tree
> + */
> + tgt->tdata.disc_id = 0;
> + tgt->state = SNIC_TGT_STAT_INIT;
> + device_initialize(&tgt->dev);
> + tgt->dev.parent = get_device(&snic->shost->shost_gendev);
> + tgt->dev.release = snic_tgt_dev_release;
Why do you use your own scsi target instantiation here?
If it's equivalent to the scsi target than you should rather use the
'scsi_target' structure here and attach driver-specific information
to either hostdata or starget_data.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
h...@suse.de +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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