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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/scsi/snic/snic_ctl.c
parentInitial commit. (diff)
downloadlinux-upstream.tar.xz
linux-upstream.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--drivers/scsi/snic/snic_ctl.c257
1 files changed, 257 insertions, 0 deletions
diff --git a/drivers/scsi/snic/snic_ctl.c b/drivers/scsi/snic/snic_ctl.c
new file mode 100644
index 000000000..5f4fca96b
--- /dev/null
+++ b/drivers/scsi/snic/snic_ctl.c
@@ -0,0 +1,257 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright 2014 Cisco Systems, Inc. All rights reserved.
+
+#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 */