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linux/drivers/scsi/fnic/fnic_trace.c

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/*
* 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 <linux/vmalloc.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;
getnstimeofday(&val1);
len = snprintf(debug->debug_buffer + len, buf_size - len,
"------------------------------------------\n"
"\t\tTime\n"
"------------------------------------------\n");
len += snprintf(debug->debug_buffer + len, buf_size - len,
"Current time : [%ld:%ld]\n"
"Last stats reset time: [%ld:%ld]\n"
"Last stats read time: [%ld:%ld]\n"
"delta since last reset: [%ld:%ld]\n"
"delta since last read: [%ld:%ld]\n",
val1.tv_sec, val1.tv_nsec,
stats->stats_timestamps.last_reset_time.tv_sec,
stats->stats_timestamps.last_reset_time.tv_nsec,
stats->stats_timestamps.last_read_time.tv_sec,
stats->stats_timestamps.last_read_time.tv_nsec,
timespec_sub(val1, stats->stats_timestamps.last_reset_time).tv_sec,
timespec_sub(val1, stats->stats_timestamps.last_reset_time).tv_nsec,
timespec_sub(val1, stats->stats_timestamps.last_read_time).tv_sec,
timespec_sub(val1, stats->stats_timestamps.last_read_time).tv_nsec);
stats->stats_timestamps.last_read_time = val1;
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"
"\nIO completion times: \n"
" < 10 ms : %lld\n"
" 10 ms - 100 ms : %lld\n"
" 100 ms - 500 ms : %lld\n"
" 500 ms - 5 sec: %lld\n"
" 5 sec - 10 sec: %lld\n"
" 10 sec - 30 sec: %lld\n"
" > 30 sec: %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),
(u64)atomic64_read(&stats->io_stats.io_btw_0_to_10_msec),
(u64)atomic64_read(&stats->io_stats.io_btw_10_to_100_msec),
(u64)atomic64_read(&stats->io_stats.io_btw_100_to_500_msec),
(u64)atomic64_read(&stats->io_stats.io_btw_500_to_5000_msec),
(u64)atomic64_read(&stats->io_stats.io_btw_5000_to_10000_msec),
(u64)atomic64_read(&stats->io_stats.io_btw_10000_to_30000_msec),
(u64)atomic64_read(&stats->io_stats.io_greater_than_30000_msec));
len += snprintf(debug->debug_buffer + len, buf_size - len,
"\nCurrent Max IO time : %lld\n",
(u64)atomic64_read(&stats->io_stats.current_max_io_time));
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"
"Abord issued times: \n"
" < 6 sec : %lld\n"
" 6 sec - 20 sec : %lld\n"
" 20 sec - 30 sec : %lld\n"
" 30 sec - 40 sec : %lld\n"
" 40 sec - 50 sec : %lld\n"
" 50 sec - 60 sec : %lld\n"
" > 60 sec: %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),
(u64)atomic64_read(&stats->abts_stats.abort_issued_btw_0_to_6_sec),
(u64)atomic64_read(&stats->abts_stats.abort_issued_btw_6_to_20_sec),
(u64)atomic64_read(&stats->abts_stats.abort_issued_btw_20_to_30_sec),
(u64)atomic64_read(&stats->abts_stats.abort_issued_btw_30_to_40_sec),
(u64)atomic64_read(&stats->abts_stats.abort_issued_btw_40_to_50_sec),
(u64)atomic64_read(&stats->abts_stats.abort_issued_btw_50_to_60_sec),
(u64)atomic64_read(&stats->abts_stats.abort_issued_greater_than_60_sec));
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 Check Conditions encountered: %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.check_condition),
(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;
}
ktime_get_real_ts64(&fc_buf->time_stamp);
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;
time64_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;
}
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