X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fscsi%2Ffnic%2Ffnic_trace.c;fp=kernel%2Fdrivers%2Fscsi%2Ffnic%2Ffnic_trace.c;h=65a9bde26974bd9a5b98b33d7f456b16c9b5c10b;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git

diff --git a/kernel/drivers/scsi/fnic/fnic_trace.c b/kernel/drivers/scsi/fnic/fnic_trace.c
new file mode 100644
index 000000000..65a9bde26
--- /dev/null
+++ b/kernel/drivers/scsi/fnic/fnic_trace.c
@@ -0,0 +1,779 @@
+/*
+ * Copyright 2012 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/module.h>
+#include <linux/mempool.h>
+#include <linux/errno.h>
+#include <linux/spinlock.h>
+#include <linux/kallsyms.h>
+#include <linux/time.h>
+#include "fnic_io.h"
+#include "fnic.h"
+
+unsigned int trace_max_pages;
+static int fnic_max_trace_entries;
+
+static unsigned long fnic_trace_buf_p;
+static DEFINE_SPINLOCK(fnic_trace_lock);
+
+static fnic_trace_dbg_t fnic_trace_entries;
+int fnic_tracing_enabled = 1;
+
+/* static char *fnic_fc_ctlr_trace_buf_p; */
+
+static int fc_trace_max_entries;
+static unsigned long fnic_fc_ctlr_trace_buf_p;
+static fnic_trace_dbg_t fc_trace_entries;
+int fnic_fc_tracing_enabled = 1;
+int fnic_fc_trace_cleared = 1;
+static DEFINE_SPINLOCK(fnic_fc_trace_lock);
+
+
+/*
+ * fnic_trace_get_buf - Give buffer pointer to user to fill up trace information
+ *
+ * Description:
+ * This routine gets next available trace buffer entry location @wr_idx
+ * from allocated trace buffer pages and give that memory location
+ * to user to store the trace information.
+ *
+ * Return Value:
+ * This routine returns pointer to next available trace entry
+ * @fnic_buf_head for user to fill trace information.
+ */
+fnic_trace_data_t *fnic_trace_get_buf(void)
+{
+	unsigned long fnic_buf_head;
+	unsigned long flags;
+
+	spin_lock_irqsave(&fnic_trace_lock, flags);
+
+	/*
+	 * Get next available memory location for writing trace information
+	 * at @wr_idx and increment @wr_idx
+	 */
+	fnic_buf_head =
+		fnic_trace_entries.page_offset[fnic_trace_entries.wr_idx];
+	fnic_trace_entries.wr_idx++;
+
+	/*
+	 * Verify if trace buffer is full then change wd_idx to
+	 * start from zero
+	 */
+	if (fnic_trace_entries.wr_idx >= fnic_max_trace_entries)
+		fnic_trace_entries.wr_idx = 0;
+
+	/*
+	 * Verify if write index @wr_idx and read index @rd_idx are same then
+	 * increment @rd_idx to move to next entry in trace buffer
+	 */
+	if (fnic_trace_entries.wr_idx == fnic_trace_entries.rd_idx) {
+		fnic_trace_entries.rd_idx++;
+		if (fnic_trace_entries.rd_idx >= fnic_max_trace_entries)
+			fnic_trace_entries.rd_idx = 0;
+	}
+	spin_unlock_irqrestore(&fnic_trace_lock, flags);
+	return (fnic_trace_data_t *)fnic_buf_head;
+}
+
+/*
+ * fnic_get_trace_data - Copy trace buffer to a memory file
+ * @fnic_dbgfs_t: pointer to debugfs trace buffer
+ *
+ * Description:
+ * This routine gathers the fnic trace debugfs data from the fnic_trace_data_t
+ * buffer and dumps it to fnic_dbgfs_t. It will start at the rd_idx entry in
+ * the log and process the log until the end of the buffer. Then it will gather
+ * from the beginning of the log and process until the current entry @wr_idx.
+ *
+ * Return Value:
+ * This routine returns the amount of bytes that were dumped into fnic_dbgfs_t
+ */
+int fnic_get_trace_data(fnic_dbgfs_t *fnic_dbgfs_prt)
+{
+	int rd_idx;
+	int wr_idx;
+	int len = 0;
+	unsigned long flags;
+	char str[KSYM_SYMBOL_LEN];
+	struct timespec val;
+	fnic_trace_data_t *tbp;
+
+	spin_lock_irqsave(&fnic_trace_lock, flags);
+	rd_idx = fnic_trace_entries.rd_idx;
+	wr_idx = fnic_trace_entries.wr_idx;
+	if (wr_idx < rd_idx) {
+		while (1) {
+			/* Start from read index @rd_idx */
+			tbp = (fnic_trace_data_t *)
+				  fnic_trace_entries.page_offset[rd_idx];
+			if (!tbp) {
+				spin_unlock_irqrestore(&fnic_trace_lock, flags);
+				return 0;
+			}
+			/* Convert function pointer to function name */
+			if (sizeof(unsigned long) < 8) {
+				sprint_symbol(str, tbp->fnaddr.low);
+				jiffies_to_timespec(tbp->timestamp.low, &val);
+			} else {
+				sprint_symbol(str, tbp->fnaddr.val);
+				jiffies_to_timespec(tbp->timestamp.val, &val);
+			}
+			/*
+			 * Dump trace buffer entry to memory file
+			 * and increment read index @rd_idx
+			 */
+			len += snprintf(fnic_dbgfs_prt->buffer + len,
+				  (trace_max_pages * PAGE_SIZE * 3) - len,
+				  "%16lu.%16lu %-50s %8x %8x %16llx %16llx "
+				  "%16llx %16llx %16llx\n", val.tv_sec,
+				  val.tv_nsec, str, tbp->host_no, tbp->tag,
+				  tbp->data[0], tbp->data[1], tbp->data[2],
+				  tbp->data[3], tbp->data[4]);
+			rd_idx++;
+			/*
+			 * If rd_idx is reached to maximum trace entries
+			 * then move rd_idx to zero
+			 */
+			if (rd_idx > (fnic_max_trace_entries-1))
+				rd_idx = 0;
+			/*
+			 * Continure dumpping trace buffer entries into
+			 * memory file till rd_idx reaches write index
+			 */
+			if (rd_idx == wr_idx)
+				break;
+		}
+	} else if (wr_idx > rd_idx) {
+		while (1) {
+			/* Start from read index @rd_idx */
+			tbp = (fnic_trace_data_t *)
+				  fnic_trace_entries.page_offset[rd_idx];
+			if (!tbp) {
+				spin_unlock_irqrestore(&fnic_trace_lock, flags);
+				return 0;
+			}
+			/* Convert function pointer to function name */
+			if (sizeof(unsigned long) < 8) {
+				sprint_symbol(str, tbp->fnaddr.low);
+				jiffies_to_timespec(tbp->timestamp.low, &val);
+			} else {
+				sprint_symbol(str, tbp->fnaddr.val);
+				jiffies_to_timespec(tbp->timestamp.val, &val);
+			}
+			/*
+			 * Dump trace buffer entry to memory file
+			 * and increment read index @rd_idx
+			 */
+			len += snprintf(fnic_dbgfs_prt->buffer + len,
+				  (trace_max_pages * PAGE_SIZE * 3) - len,
+				  "%16lu.%16lu %-50s %8x %8x %16llx %16llx "
+				  "%16llx %16llx %16llx\n", val.tv_sec,
+				  val.tv_nsec, str, tbp->host_no, tbp->tag,
+				  tbp->data[0], tbp->data[1], tbp->data[2],
+				  tbp->data[3], tbp->data[4]);
+			rd_idx++;
+			/*
+			 * Continue dumpping trace buffer entries into
+			 * memory file till rd_idx reaches write index
+			 */
+			if (rd_idx == wr_idx)
+				break;
+		}
+	}
+	spin_unlock_irqrestore(&fnic_trace_lock, flags);
+	return len;
+}
+
+/*
+ * fnic_get_stats_data - Copy fnic stats buffer to a memory file
+ * @fnic_dbgfs_t: pointer to debugfs fnic stats buffer
+ *
+ * Description:
+ * This routine gathers the fnic stats debugfs data from the fnic_stats struct
+ * and dumps it to stats_debug_info.
+ *
+ * Return Value:
+ * This routine returns the amount of bytes that were dumped into
+ * stats_debug_info
+ */
+int fnic_get_stats_data(struct stats_debug_info *debug,
+			struct fnic_stats *stats)
+{
+	int len = 0;
+	int buf_size = debug->buf_size;
+	struct timespec val1, val2;
+
+	len = snprintf(debug->debug_buffer + len, buf_size - len,
+		  "------------------------------------------\n"
+		  "\t\tIO Statistics\n"
+		  "------------------------------------------\n");
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
+		  "Number of Active IOs: %lld\nMaximum Active IOs: %lld\n"
+		  "Number of IOs: %lld\nNumber of IO Completions: %lld\n"
+		  "Number of IO Failures: %lld\nNumber of IO NOT Found: %lld\n"
+		  "Number of Memory alloc Failures: %lld\n"
+		  "Number of IOREQ Null: %lld\n"
+		  "Number of SCSI cmd pointer Null: %lld\n",
+		  (u64)atomic64_read(&stats->io_stats.active_ios),
+		  (u64)atomic64_read(&stats->io_stats.max_active_ios),
+		  (u64)atomic64_read(&stats->io_stats.num_ios),
+		  (u64)atomic64_read(&stats->io_stats.io_completions),
+		  (u64)atomic64_read(&stats->io_stats.io_failures),
+		  (u64)atomic64_read(&stats->io_stats.io_not_found),
+		  (u64)atomic64_read(&stats->io_stats.alloc_failures),
+		  (u64)atomic64_read(&stats->io_stats.ioreq_null),
+		  (u64)atomic64_read(&stats->io_stats.sc_null));
+
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
+		  "\n------------------------------------------\n"
+		  "\t\tAbort Statistics\n"
+		  "------------------------------------------\n");
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
+		  "Number of Aborts: %lld\n"
+		  "Number of Abort Failures: %lld\n"
+		  "Number of Abort Driver Timeouts: %lld\n"
+		  "Number of Abort FW Timeouts: %lld\n"
+		  "Number of Abort IO NOT Found: %lld\n",
+		  (u64)atomic64_read(&stats->abts_stats.aborts),
+		  (u64)atomic64_read(&stats->abts_stats.abort_failures),
+		  (u64)atomic64_read(&stats->abts_stats.abort_drv_timeouts),
+		  (u64)atomic64_read(&stats->abts_stats.abort_fw_timeouts),
+		  (u64)atomic64_read(&stats->abts_stats.abort_io_not_found));
+
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
+		  "\n------------------------------------------\n"
+		  "\t\tTerminate Statistics\n"
+		  "------------------------------------------\n");
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
+		  "Number of Terminates: %lld\n"
+		  "Maximum Terminates: %lld\n"
+		  "Number of Terminate Driver Timeouts: %lld\n"
+		  "Number of Terminate FW Timeouts: %lld\n"
+		  "Number of Terminate IO NOT Found: %lld\n"
+		  "Number of Terminate Failures: %lld\n",
+		  (u64)atomic64_read(&stats->term_stats.terminates),
+		  (u64)atomic64_read(&stats->term_stats.max_terminates),
+		  (u64)atomic64_read(&stats->term_stats.terminate_drv_timeouts),
+		  (u64)atomic64_read(&stats->term_stats.terminate_fw_timeouts),
+		  (u64)atomic64_read(&stats->term_stats.terminate_io_not_found),
+		  (u64)atomic64_read(&stats->term_stats.terminate_failures));
+
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
+		  "\n------------------------------------------\n"
+		  "\t\tReset Statistics\n"
+		  "------------------------------------------\n");
+
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
+		  "Number of Device Resets: %lld\n"
+		  "Number of Device Reset Failures: %lld\n"
+		  "Number of Device Reset Aborts: %lld\n"
+		  "Number of Device Reset Timeouts: %lld\n"
+		  "Number of Device Reset Terminates: %lld\n"
+		  "Number of FW Resets: %lld\n"
+		  "Number of FW Reset Completions: %lld\n"
+		  "Number of FW Reset Failures: %lld\n"
+		  "Number of Fnic Reset: %lld\n"
+		  "Number of Fnic Reset Completions: %lld\n"
+		  "Number of Fnic Reset Failures: %lld\n",
+		  (u64)atomic64_read(&stats->reset_stats.device_resets),
+		  (u64)atomic64_read(&stats->reset_stats.device_reset_failures),
+		  (u64)atomic64_read(&stats->reset_stats.device_reset_aborts),
+		  (u64)atomic64_read(&stats->reset_stats.device_reset_timeouts),
+		  (u64)atomic64_read(
+			  &stats->reset_stats.device_reset_terminates),
+		  (u64)atomic64_read(&stats->reset_stats.fw_resets),
+		  (u64)atomic64_read(&stats->reset_stats.fw_reset_completions),
+		  (u64)atomic64_read(&stats->reset_stats.fw_reset_failures),
+		  (u64)atomic64_read(&stats->reset_stats.fnic_resets),
+		  (u64)atomic64_read(
+			  &stats->reset_stats.fnic_reset_completions),
+		  (u64)atomic64_read(&stats->reset_stats.fnic_reset_failures));
+
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
+		  "\n------------------------------------------\n"
+		  "\t\tFirmware Statistics\n"
+		  "------------------------------------------\n");
+
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
+		  "Number of Active FW Requests %lld\n"
+		  "Maximum FW Requests: %lld\n"
+		  "Number of FW out of resources: %lld\n"
+		  "Number of FW IO errors: %lld\n",
+		  (u64)atomic64_read(&stats->fw_stats.active_fw_reqs),
+		  (u64)atomic64_read(&stats->fw_stats.max_fw_reqs),
+		  (u64)atomic64_read(&stats->fw_stats.fw_out_of_resources),
+		  (u64)atomic64_read(&stats->fw_stats.io_fw_errs));
+
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
+		  "\n------------------------------------------\n"
+		  "\t\tVlan Discovery Statistics\n"
+		  "------------------------------------------\n");
+
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
+		  "Number of Vlan Discovery Requests Sent %lld\n"
+		  "Vlan Response Received with no FCF VLAN ID: %lld\n"
+		  "No solicitations recvd after vlan set, expiry count: %lld\n"
+		  "Flogi rejects count: %lld\n",
+		  (u64)atomic64_read(&stats->vlan_stats.vlan_disc_reqs),
+		  (u64)atomic64_read(&stats->vlan_stats.resp_withno_vlanID),
+		  (u64)atomic64_read(&stats->vlan_stats.sol_expiry_count),
+		  (u64)atomic64_read(&stats->vlan_stats.flogi_rejects));
+
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
+		  "\n------------------------------------------\n"
+		  "\t\tOther Important Statistics\n"
+		  "------------------------------------------\n");
+
+	jiffies_to_timespec(stats->misc_stats.last_isr_time, &val1);
+	jiffies_to_timespec(stats->misc_stats.last_ack_time, &val2);
+
+	len += snprintf(debug->debug_buffer + len, buf_size - len,
+		  "Last ISR time: %llu (%8lu.%8lu)\n"
+		  "Last ACK time: %llu (%8lu.%8lu)\n"
+		  "Number of ISRs: %lld\n"
+		  "Maximum CQ Entries: %lld\n"
+		  "Number of ACK index out of range: %lld\n"
+		  "Number of data count mismatch: %lld\n"
+		  "Number of FCPIO Timeouts: %lld\n"
+		  "Number of FCPIO Aborted: %lld\n"
+		  "Number of SGL Invalid: %lld\n"
+		  "Number of Copy WQ Alloc Failures for ABTs: %lld\n"
+		  "Number of Copy WQ Alloc Failures for Device Reset: %lld\n"
+		  "Number of Copy WQ Alloc Failures for IOs: %lld\n"
+		  "Number of no icmnd itmf Completions: %lld\n"
+		  "Number of QUEUE Fulls: %lld\n"
+		  "Number of rport not ready: %lld\n"
+		  "Number of receive frame errors: %lld\n",
+		  (u64)stats->misc_stats.last_isr_time,
+		  val1.tv_sec, val1.tv_nsec,
+		  (u64)stats->misc_stats.last_ack_time,
+		  val2.tv_sec, val2.tv_nsec,
+		  (u64)atomic64_read(&stats->misc_stats.isr_count),
+		  (u64)atomic64_read(&stats->misc_stats.max_cq_entries),
+		  (u64)atomic64_read(&stats->misc_stats.ack_index_out_of_range),
+		  (u64)atomic64_read(&stats->misc_stats.data_count_mismatch),
+		  (u64)atomic64_read(&stats->misc_stats.fcpio_timeout),
+		  (u64)atomic64_read(&stats->misc_stats.fcpio_aborted),
+		  (u64)atomic64_read(&stats->misc_stats.sgl_invalid),
+		  (u64)atomic64_read(
+			  &stats->misc_stats.abts_cpwq_alloc_failures),
+		  (u64)atomic64_read(
+			  &stats->misc_stats.devrst_cpwq_alloc_failures),
+		  (u64)atomic64_read(&stats->misc_stats.io_cpwq_alloc_failures),
+		  (u64)atomic64_read(&stats->misc_stats.no_icmnd_itmf_cmpls),
+		  (u64)atomic64_read(&stats->misc_stats.queue_fulls),
+		  (u64)atomic64_read(&stats->misc_stats.rport_not_ready),
+		  (u64)atomic64_read(&stats->misc_stats.frame_errors));
+
+	return len;
+
+}
+
+/*
+ * fnic_trace_buf_init - Initialize fnic trace buffer logging facility
+ *
+ * Description:
+ * Initialize trace buffer data structure by allocating required memory and
+ * setting page_offset information for every trace entry by adding trace entry
+ * length to previous page_offset value.
+ */
+int fnic_trace_buf_init(void)
+{
+	unsigned long fnic_buf_head;
+	int i;
+	int err = 0;
+
+	trace_max_pages = fnic_trace_max_pages;
+	fnic_max_trace_entries = (trace_max_pages * PAGE_SIZE)/
+					  FNIC_ENTRY_SIZE_BYTES;
+
+	fnic_trace_buf_p = (unsigned long)vmalloc((trace_max_pages * PAGE_SIZE));
+	if (!fnic_trace_buf_p) {
+		printk(KERN_ERR PFX "Failed to allocate memory "
+				  "for fnic_trace_buf_p\n");
+		err = -ENOMEM;
+		goto err_fnic_trace_buf_init;
+	}
+	memset((void *)fnic_trace_buf_p, 0, (trace_max_pages * PAGE_SIZE));
+
+	fnic_trace_entries.page_offset = vmalloc(fnic_max_trace_entries *
+						  sizeof(unsigned long));
+	if (!fnic_trace_entries.page_offset) {
+		printk(KERN_ERR PFX "Failed to allocate memory for"
+				  " page_offset\n");
+		if (fnic_trace_buf_p) {
+			vfree((void *)fnic_trace_buf_p);
+			fnic_trace_buf_p = 0;
+		}
+		err = -ENOMEM;
+		goto err_fnic_trace_buf_init;
+	}
+	memset((void *)fnic_trace_entries.page_offset, 0,
+		  (fnic_max_trace_entries * sizeof(unsigned long)));
+	fnic_trace_entries.wr_idx = fnic_trace_entries.rd_idx = 0;
+	fnic_buf_head = fnic_trace_buf_p;
+
+	/*
+	 * Set page_offset field of fnic_trace_entries struct by
+	 * calculating memory location for every trace entry using
+	 * length of each trace entry
+	 */
+	for (i = 0; i < fnic_max_trace_entries; i++) {
+		fnic_trace_entries.page_offset[i] = fnic_buf_head;
+		fnic_buf_head += FNIC_ENTRY_SIZE_BYTES;
+	}
+	err = fnic_trace_debugfs_init();
+	if (err < 0) {
+		pr_err("fnic: Failed to initialize debugfs for tracing\n");
+		goto err_fnic_trace_debugfs_init;
+	}
+	pr_info("fnic: Successfully Initialized Trace Buffer\n");
+	return err;
+err_fnic_trace_debugfs_init:
+	fnic_trace_free();
+err_fnic_trace_buf_init:
+	return err;
+}
+
+/*
+ * fnic_trace_free - Free memory of fnic trace data structures.
+ */
+void fnic_trace_free(void)
+{
+	fnic_tracing_enabled = 0;
+	fnic_trace_debugfs_terminate();
+	if (fnic_trace_entries.page_offset) {
+		vfree((void *)fnic_trace_entries.page_offset);
+		fnic_trace_entries.page_offset = NULL;
+	}
+	if (fnic_trace_buf_p) {
+		vfree((void *)fnic_trace_buf_p);
+		fnic_trace_buf_p = 0;
+	}
+	printk(KERN_INFO PFX "Successfully Freed Trace Buffer\n");
+}
+
+/*
+ * fnic_fc_ctlr_trace_buf_init -
+ * Initialize trace buffer to log fnic control frames
+ * Description:
+ * Initialize trace buffer data structure by allocating
+ * required memory for trace data as well as for Indexes.
+ * Frame size is 256 bytes and
+ * memory is allocated for 1024 entries of 256 bytes.
+ * Page_offset(Index) is set to the address of trace entry
+ * and page_offset is initialized by adding frame size
+ * to the previous page_offset entry.
+ */
+
+int fnic_fc_trace_init(void)
+{
+	unsigned long fc_trace_buf_head;
+	int err = 0;
+	int i;
+
+	fc_trace_max_entries = (fnic_fc_trace_max_pages * PAGE_SIZE)/
+				FC_TRC_SIZE_BYTES;
+	fnic_fc_ctlr_trace_buf_p = (unsigned long)vmalloc(
+					fnic_fc_trace_max_pages * PAGE_SIZE);
+	if (!fnic_fc_ctlr_trace_buf_p) {
+		pr_err("fnic: Failed to allocate memory for "
+		       "FC Control Trace Buf\n");
+		err = -ENOMEM;
+		goto err_fnic_fc_ctlr_trace_buf_init;
+	}
+
+	memset((void *)fnic_fc_ctlr_trace_buf_p, 0,
+			fnic_fc_trace_max_pages * PAGE_SIZE);
+
+	/* Allocate memory for page offset */
+	fc_trace_entries.page_offset = vmalloc(fc_trace_max_entries *
+						sizeof(unsigned long));
+	if (!fc_trace_entries.page_offset) {
+		pr_err("fnic:Failed to allocate memory for page_offset\n");
+		if (fnic_fc_ctlr_trace_buf_p) {
+			pr_err("fnic: Freeing FC Control Trace Buf\n");
+			vfree((void *)fnic_fc_ctlr_trace_buf_p);
+			fnic_fc_ctlr_trace_buf_p = 0;
+		}
+		err = -ENOMEM;
+		goto err_fnic_fc_ctlr_trace_buf_init;
+	}
+	memset((void *)fc_trace_entries.page_offset, 0,
+	       (fc_trace_max_entries * sizeof(unsigned long)));
+
+	fc_trace_entries.rd_idx = fc_trace_entries.wr_idx = 0;
+	fc_trace_buf_head = fnic_fc_ctlr_trace_buf_p;
+
+	/*
+	* Set up fc_trace_entries.page_offset field with memory location
+	* for every trace entry
+	*/
+	for (i = 0; i < fc_trace_max_entries; i++) {
+		fc_trace_entries.page_offset[i] = fc_trace_buf_head;
+		fc_trace_buf_head += FC_TRC_SIZE_BYTES;
+	}
+	err = fnic_fc_trace_debugfs_init();
+	if (err < 0) {
+		pr_err("fnic: Failed to initialize FC_CTLR tracing.\n");
+		goto err_fnic_fc_ctlr_trace_debugfs_init;
+	}
+	pr_info("fnic: Successfully Initialized FC_CTLR Trace Buffer\n");
+	return err;
+
+err_fnic_fc_ctlr_trace_debugfs_init:
+	fnic_fc_trace_free();
+err_fnic_fc_ctlr_trace_buf_init:
+	return err;
+}
+
+/*
+ * Fnic_fc_ctlr_trace_free - Free memory of fnic_fc_ctlr trace data structures.
+ */
+void fnic_fc_trace_free(void)
+{
+	fnic_fc_tracing_enabled = 0;
+	fnic_fc_trace_debugfs_terminate();
+	if (fc_trace_entries.page_offset) {
+		vfree((void *)fc_trace_entries.page_offset);
+		fc_trace_entries.page_offset = NULL;
+	}
+	if (fnic_fc_ctlr_trace_buf_p) {
+		vfree((void *)fnic_fc_ctlr_trace_buf_p);
+		fnic_fc_ctlr_trace_buf_p = 0;
+	}
+	pr_info("fnic:Successfully FC_CTLR Freed Trace Buffer\n");
+}
+
+/*
+ * fnic_fc_ctlr_set_trace_data:
+ *       Maintain rd & wr idx accordingly and set data
+ * Passed parameters:
+ *       host_no: host number accociated with fnic
+ *       frame_type: send_frame, rece_frame or link event
+ *       fc_frame: pointer to fc_frame
+ *       frame_len: Length of the fc_frame
+ * Description:
+ *   This routine will get next available wr_idx and
+ *   copy all passed trace data to the buffer pointed by wr_idx
+ *   and increment wr_idx. It will also make sure that we dont
+ *   overwrite the entry which we are reading and also
+ *   wrap around if we reach the maximum entries.
+ * Returned Value:
+ *   It will return 0 for success or -1 for failure
+ */
+int fnic_fc_trace_set_data(u32 host_no, u8 frame_type,
+				char *frame, u32 fc_trc_frame_len)
+{
+	unsigned long flags;
+	struct fc_trace_hdr *fc_buf;
+	unsigned long eth_fcoe_hdr_len;
+	char *fc_trace;
+
+	if (fnic_fc_tracing_enabled == 0)
+		return 0;
+
+	spin_lock_irqsave(&fnic_fc_trace_lock, flags);
+
+	if (fnic_fc_trace_cleared == 1) {
+		fc_trace_entries.rd_idx = fc_trace_entries.wr_idx = 0;
+		pr_info("fnic: Resetting the read idx\n");
+		memset((void *)fnic_fc_ctlr_trace_buf_p, 0,
+				fnic_fc_trace_max_pages * PAGE_SIZE);
+		fnic_fc_trace_cleared = 0;
+	}
+
+	fc_buf = (struct fc_trace_hdr *)
+		fc_trace_entries.page_offset[fc_trace_entries.wr_idx];
+
+	fc_trace_entries.wr_idx++;
+
+	if (fc_trace_entries.wr_idx >= fc_trace_max_entries)
+		fc_trace_entries.wr_idx = 0;
+
+	if (fc_trace_entries.wr_idx == fc_trace_entries.rd_idx) {
+		fc_trace_entries.rd_idx++;
+		if (fc_trace_entries.rd_idx >= fc_trace_max_entries)
+			fc_trace_entries.rd_idx = 0;
+	}
+
+	fc_buf->time_stamp = CURRENT_TIME;
+	fc_buf->host_no = host_no;
+	fc_buf->frame_type = frame_type;
+
+	fc_trace = (char *)FC_TRACE_ADDRESS(fc_buf);
+
+	/* During the receive path, we do not have eth hdr as well as fcoe hdr
+	 * at trace entry point so we will stuff 0xff just to make it generic.
+	 */
+	if (frame_type == FNIC_FC_RECV) {
+		eth_fcoe_hdr_len = sizeof(struct ethhdr) +
+					sizeof(struct fcoe_hdr);
+		memset((char *)fc_trace, 0xff, eth_fcoe_hdr_len);
+		/* Copy the rest of data frame */
+		memcpy((char *)(fc_trace + eth_fcoe_hdr_len), (void *)frame,
+		min_t(u8, fc_trc_frame_len,
+			(u8)(FC_TRC_SIZE_BYTES - FC_TRC_HEADER_SIZE
+						- eth_fcoe_hdr_len)));
+	} else {
+		memcpy((char *)fc_trace, (void *)frame,
+		min_t(u8, fc_trc_frame_len,
+			(u8)(FC_TRC_SIZE_BYTES - FC_TRC_HEADER_SIZE)));
+	}
+
+	/* Store the actual received length */
+	fc_buf->frame_len = fc_trc_frame_len;
+
+	spin_unlock_irqrestore(&fnic_fc_trace_lock, flags);
+	return 0;
+}
+
+/*
+ * fnic_fc_ctlr_get_trace_data: Copy trace buffer to a memory file
+ * Passed parameter:
+ *       @fnic_dbgfs_t: pointer to debugfs trace buffer
+ *       rdata_flag: 1 => Unformated file
+ *                   0 => formated file
+ * Description:
+ *       This routine will copy the trace data to memory file with
+ *       proper formatting and also copy to another memory
+ *       file without formatting for further procesing.
+ * Retrun Value:
+ *       Number of bytes that were dumped into fnic_dbgfs_t
+ */
+
+int fnic_fc_trace_get_data(fnic_dbgfs_t *fnic_dbgfs_prt, u8 rdata_flag)
+{
+	int rd_idx, wr_idx;
+	unsigned long flags;
+	int len = 0, j;
+	struct fc_trace_hdr *tdata;
+	char *fc_trace;
+
+	spin_lock_irqsave(&fnic_fc_trace_lock, flags);
+	if (fc_trace_entries.wr_idx == fc_trace_entries.rd_idx) {
+		spin_unlock_irqrestore(&fnic_fc_trace_lock, flags);
+		pr_info("fnic: Buffer is empty\n");
+		return 0;
+	}
+	rd_idx = fc_trace_entries.rd_idx;
+	wr_idx = fc_trace_entries.wr_idx;
+	if (rdata_flag == 0) {
+		len += snprintf(fnic_dbgfs_prt->buffer + len,
+			(fnic_fc_trace_max_pages * PAGE_SIZE * 3) - len,
+			"Time Stamp (UTC)\t\t"
+			"Host No:   F Type:  len:     FCoE_FRAME:\n");
+	}
+
+	while (rd_idx != wr_idx) {
+		tdata = (struct fc_trace_hdr *)
+			fc_trace_entries.page_offset[rd_idx];
+		if (!tdata) {
+			pr_info("fnic: Rd data is NULL\n");
+			spin_unlock_irqrestore(&fnic_fc_trace_lock, flags);
+			return 0;
+		}
+		if (rdata_flag == 0) {
+			copy_and_format_trace_data(tdata,
+				fnic_dbgfs_prt, &len, rdata_flag);
+		} else {
+			fc_trace = (char *)tdata;
+			for (j = 0; j < FC_TRC_SIZE_BYTES; j++) {
+				len += snprintf(fnic_dbgfs_prt->buffer + len,
+				(fnic_fc_trace_max_pages * PAGE_SIZE * 3)
+				- len, "%02x", fc_trace[j] & 0xff);
+			} /* for loop */
+			len += snprintf(fnic_dbgfs_prt->buffer + len,
+				(fnic_fc_trace_max_pages * PAGE_SIZE * 3) - len,
+				"\n");
+		}
+		rd_idx++;
+		if (rd_idx > (fc_trace_max_entries - 1))
+			rd_idx = 0;
+	}
+
+	spin_unlock_irqrestore(&fnic_fc_trace_lock, flags);
+	return len;
+}
+
+/*
+ * copy_and_format_trace_data: Copy formatted data to char * buffer
+ * Passed Parameter:
+ *      @fc_trace_hdr_t: pointer to trace data
+ *      @fnic_dbgfs_t: pointer to debugfs trace buffer
+ *      @orig_len: pointer to len
+ *      rdata_flag: 0 => Formated file, 1 => Unformated file
+ * Description:
+ *      This routine will format and copy the passed trace data
+ *      for formated file or unformated file accordingly.
+ */
+
+void copy_and_format_trace_data(struct fc_trace_hdr *tdata,
+				fnic_dbgfs_t *fnic_dbgfs_prt, int *orig_len,
+				u8 rdata_flag)
+{
+	struct tm tm;
+	int j, i = 1, len;
+	char *fc_trace, *fmt;
+	int ethhdr_len = sizeof(struct ethhdr) - 1;
+	int fcoehdr_len = sizeof(struct fcoe_hdr);
+	int fchdr_len = sizeof(struct fc_frame_header);
+	int max_size = fnic_fc_trace_max_pages * PAGE_SIZE * 3;
+
+	tdata->frame_type = tdata->frame_type & 0x7F;
+
+	len = *orig_len;
+
+	time_to_tm(tdata->time_stamp.tv_sec, 0, &tm);
+
+	fmt = "%02d:%02d:%04ld %02d:%02d:%02d.%09lu ns%8x       %c%8x\t";
+	len += snprintf(fnic_dbgfs_prt->buffer + len,
+		max_size - len,
+		fmt,
+		tm.tm_mon + 1, tm.tm_mday, tm.tm_year + 1900,
+		tm.tm_hour, tm.tm_min, tm.tm_sec,
+		tdata->time_stamp.tv_nsec, tdata->host_no,
+		tdata->frame_type, tdata->frame_len);
+
+	fc_trace = (char *)FC_TRACE_ADDRESS(tdata);
+
+	for (j = 0; j < min_t(u8, tdata->frame_len,
+		(u8)(FC_TRC_SIZE_BYTES - FC_TRC_HEADER_SIZE)); j++) {
+		if (tdata->frame_type == FNIC_FC_LE) {
+			len += snprintf(fnic_dbgfs_prt->buffer + len,
+				max_size - len, "%c", fc_trace[j]);
+		} else {
+			len += snprintf(fnic_dbgfs_prt->buffer + len,
+				max_size - len, "%02x", fc_trace[j] & 0xff);
+			len += snprintf(fnic_dbgfs_prt->buffer + len,
+				max_size - len, " ");
+			if (j == ethhdr_len ||
+				j == ethhdr_len + fcoehdr_len ||
+				j == ethhdr_len + fcoehdr_len + fchdr_len ||
+				(i > 3 && j%fchdr_len == 0)) {
+				len += snprintf(fnic_dbgfs_prt->buffer
+					+ len, max_size - len,
+					"\n\t\t\t\t\t\t\t\t");
+				i++;
+			}
+		} /* end of else*/
+	} /* End of for loop*/
+	len += snprintf(fnic_dbgfs_prt->buffer + len,
+		max_size - len, "\n");
+	*orig_len = len;
+}