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/*
* 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)
return;
snic->link_status = svnic_dev_link_status(snic->vdev);
snic->link_down_cnt = svnic_dev_link_down_cnt(snic->vdev);
SNIC_HOST_INFO(snic->shost, "Link Event: Link %s.\n",
((snic->link_status) ? "Up" : "Down"));
SNIC_ASSERT_NOT_IMPL(1);
}
/*
* 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 > 3 || !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;
u32 ver = 0;
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, "Init Exch Ver Req failed\n");
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, (ulong)rqi);
ver = snic_ver_enc(SNIC_DRV_VERSION);
req->u.exch_ver.drvr_ver = cpu_to_le32(ver);
req->u.exch_ver.os_type = cpu_to_le32(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
*/
void
snic_io_exch_ver_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
{
struct snic_req_info *rqi = NULL;
struct snic_exch_ver_rsp *exv_cmpl = &fwreq->u.exch_ver_cmpl;
u8 typ, hdr_stat;
u32 cmnd_id, hid, max_sgs;
ulong ctx = 0;
unsigned long flags;
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 = le32_to_cpu(exv_cmpl->version);
snic->fwinfo.hid = le32_to_cpu(exv_cmpl->hid);
snic->fwinfo.max_concur_ios = le32_to_cpu(exv_cmpl->max_concur_ios);
snic->fwinfo.max_sgs_per_cmd = le32_to_cpu(exv_cmpl->max_sgs_per_cmd);
snic->fwinfo.max_io_sz = le32_to_cpu(exv_cmpl->max_io_sz);
snic->fwinfo.max_tgts = le32_to_cpu(exv_cmpl->max_tgts);
snic->fwinfo.io_tmo = le16_to_cpu(exv_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",
snic->fwinfo.fw_ver,
snic->fwinfo.hid,
snic->fwinfo.max_concur_ios,
snic->fwinfo.max_sgs_per_cmd,
snic->fwinfo.max_io_sz,
snic->fwinfo.max_tgts,
snic->fwinfo.io_tmo);
SNIC_HOST_INFO(snic->shost,
"HBA Capabilities = 0x%x\n",
le32_to_cpu(exv_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);
} /* 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 */
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