278 lines
7.1 KiB
C
278 lines
7.1 KiB
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/errno.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <linux/spinlock.h>
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#include <linux/mempool.h>
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#include <scsi/scsi_tcq.h>
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#include <linux/ctype.h>
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#include "snic_io.h"
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#include "snic.h"
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#include "cq_enet_desc.h"
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#include "snic_fwint.h"
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/*
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* snic_handle_link : Handles link flaps.
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*/
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void
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snic_handle_link(struct work_struct *work)
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{
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struct snic *snic = container_of(work, struct snic, link_work);
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if (snic->config.xpt_type == SNIC_DAS)
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return;
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snic->link_status = svnic_dev_link_status(snic->vdev);
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snic->link_down_cnt = svnic_dev_link_down_cnt(snic->vdev);
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SNIC_HOST_INFO(snic->shost, "Link Event: Link %s.\n",
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((snic->link_status) ? "Up" : "Down"));
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SNIC_ASSERT_NOT_IMPL(1);
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}
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/*
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* snic_ver_enc : Encodes version str to int
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* version string is similar to netmask string
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*/
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static int
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snic_ver_enc(const char *s)
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{
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int v[4] = {0};
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int i = 0, x = 0;
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char c;
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const char *p = s;
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/* validate version string */
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if ((strlen(s) > 15) || (strlen(s) < 7))
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goto end;
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while ((c = *p++)) {
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if (c == '.') {
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i++;
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continue;
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}
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if (i > 3 || !isdigit(c))
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goto end;
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v[i] = v[i] * 10 + (c - '0');
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}
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/* validate sub version numbers */
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for (i = 3; i >= 0; i--)
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if (v[i] > 0xff)
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goto end;
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x |= (v[0] << 24) | v[1] << 16 | v[2] << 8 | v[3];
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end:
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if (x == 0) {
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SNIC_ERR("Invalid version string [%s].\n", s);
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return -1;
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}
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return x;
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} /* end of snic_ver_enc */
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/*
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* snic_qeueue_exch_ver_req :
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*
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* Queues Exchange Version Request, to communicate host information
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* in return, it gets firmware version details
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*/
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int
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snic_queue_exch_ver_req(struct snic *snic)
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{
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struct snic_req_info *rqi = NULL;
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struct snic_host_req *req = NULL;
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u32 ver = 0;
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int ret = 0;
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SNIC_HOST_INFO(snic->shost, "Exch Ver Req Preparing...\n");
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rqi = snic_req_init(snic, 0);
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if (!rqi) {
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SNIC_HOST_ERR(snic->shost,
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"Queuing Exch Ver Req failed, err = %d\n",
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ret);
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ret = -ENOMEM;
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goto error;
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}
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req = rqi_to_req(rqi);
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/* Initialize snic_host_req */
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snic_io_hdr_enc(&req->hdr, SNIC_REQ_EXCH_VER, 0, SCSI_NO_TAG,
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snic->config.hid, 0, (ulong)rqi);
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ver = snic_ver_enc(SNIC_DRV_VERSION);
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req->u.exch_ver.drvr_ver = cpu_to_le32(ver);
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req->u.exch_ver.os_type = cpu_to_le32(SNIC_OS_LINUX);
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snic_handle_untagged_req(snic, rqi);
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ret = snic_queue_wq_desc(snic, req, sizeof(*req));
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if (ret) {
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snic_release_untagged_req(snic, rqi);
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SNIC_HOST_ERR(snic->shost,
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"Queuing Exch Ver Req failed, err = %d\n",
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ret);
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goto error;
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}
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SNIC_HOST_INFO(snic->shost, "Exch Ver Req is issued. ret = %d\n", ret);
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error:
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return ret;
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} /* end of snic_queue_exch_ver_req */
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/*
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* snic_io_exch_ver_cmpl_handler
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*/
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int
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snic_io_exch_ver_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
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{
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struct snic_req_info *rqi = NULL;
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struct snic_exch_ver_rsp *exv_cmpl = &fwreq->u.exch_ver_cmpl;
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u8 typ, hdr_stat;
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u32 cmnd_id, hid, max_sgs;
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ulong ctx = 0;
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unsigned long flags;
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int ret = 0;
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SNIC_HOST_INFO(snic->shost, "Exch Ver Compl Received.\n");
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snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx);
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SNIC_BUG_ON(snic->config.hid != hid);
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rqi = (struct snic_req_info *) ctx;
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if (hdr_stat) {
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SNIC_HOST_ERR(snic->shost,
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"Exch Ver Completed w/ err status %d\n",
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hdr_stat);
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goto exch_cmpl_end;
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}
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spin_lock_irqsave(&snic->snic_lock, flags);
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snic->fwinfo.fw_ver = le32_to_cpu(exv_cmpl->version);
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snic->fwinfo.hid = le32_to_cpu(exv_cmpl->hid);
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snic->fwinfo.max_concur_ios = le32_to_cpu(exv_cmpl->max_concur_ios);
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snic->fwinfo.max_sgs_per_cmd = le32_to_cpu(exv_cmpl->max_sgs_per_cmd);
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snic->fwinfo.max_io_sz = le32_to_cpu(exv_cmpl->max_io_sz);
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snic->fwinfo.max_tgts = le32_to_cpu(exv_cmpl->max_tgts);
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snic->fwinfo.io_tmo = le16_to_cpu(exv_cmpl->io_timeout);
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SNIC_HOST_INFO(snic->shost,
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"vers %u hid %u max_concur_ios %u max_sgs_per_cmd %u max_io_sz %u max_tgts %u fw tmo %u\n",
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snic->fwinfo.fw_ver,
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snic->fwinfo.hid,
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snic->fwinfo.max_concur_ios,
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snic->fwinfo.max_sgs_per_cmd,
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snic->fwinfo.max_io_sz,
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snic->fwinfo.max_tgts,
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snic->fwinfo.io_tmo);
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SNIC_HOST_INFO(snic->shost,
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"HBA Capabilities = 0x%x\n",
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le32_to_cpu(exv_cmpl->hba_cap));
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/* Updating SGList size */
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max_sgs = snic->fwinfo.max_sgs_per_cmd;
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if (max_sgs && max_sgs < SNIC_MAX_SG_DESC_CNT) {
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snic->shost->sg_tablesize = max_sgs;
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SNIC_HOST_INFO(snic->shost, "Max SGs set to %d\n",
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snic->shost->sg_tablesize);
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} else if (max_sgs > snic->shost->sg_tablesize) {
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SNIC_HOST_INFO(snic->shost,
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"Target type %d Supports Larger Max SGList %d than driver's Max SG List %d.\n",
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snic->config.xpt_type, max_sgs,
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snic->shost->sg_tablesize);
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}
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if (snic->shost->can_queue > snic->fwinfo.max_concur_ios)
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snic->shost->can_queue = snic->fwinfo.max_concur_ios;
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snic->shost->max_sectors = snic->fwinfo.max_io_sz >> 9;
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if (snic->fwinfo.wait)
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complete(snic->fwinfo.wait);
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spin_unlock_irqrestore(&snic->snic_lock, flags);
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exch_cmpl_end:
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snic_release_untagged_req(snic, rqi);
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SNIC_HOST_INFO(snic->shost, "Exch_cmpl Done, hdr_stat %d.\n", hdr_stat);
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return ret;
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} /* end of snic_io_exch_ver_cmpl_handler */
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/*
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* snic_get_conf
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*
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* Synchronous call, and Retrieves snic params.
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*/
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int
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snic_get_conf(struct snic *snic)
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{
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DECLARE_COMPLETION_ONSTACK(wait);
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unsigned long flags;
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int ret;
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int nr_retries = 3;
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SNIC_HOST_INFO(snic->shost, "Retrieving snic params.\n");
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spin_lock_irqsave(&snic->snic_lock, flags);
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memset(&snic->fwinfo, 0, sizeof(snic->fwinfo));
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snic->fwinfo.wait = &wait;
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spin_unlock_irqrestore(&snic->snic_lock, flags);
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/* Additional delay to handle HW Resource initialization. */
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msleep(50);
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/*
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* Exch ver req can be ignored by FW, if HW Resource initialization
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* is in progress, Hence retry.
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*/
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do {
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ret = snic_queue_exch_ver_req(snic);
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if (ret)
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return ret;
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wait_for_completion_timeout(&wait, msecs_to_jiffies(2000));
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spin_lock_irqsave(&snic->snic_lock, flags);
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ret = (snic->fwinfo.fw_ver != 0) ? 0 : -ETIMEDOUT;
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if (ret)
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SNIC_HOST_ERR(snic->shost,
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"Failed to retrieve snic params,\n");
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/* Unset fwinfo.wait, on success or on last retry */
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if (ret == 0 || nr_retries == 1)
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snic->fwinfo.wait = NULL;
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spin_unlock_irqrestore(&snic->snic_lock, flags);
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} while (ret && --nr_retries);
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return ret;
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} /* end of snic_get_info */
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