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scsi: lpfc: Rework MIB Rx Monitor debug info logic

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The kernel test robot reported the following sparse warning:

arch/arm64/include/asm/cmpxchg.h:88:1: sparse: sparse: cast truncates
   bits from constant value (369 becomes 69)

On arm64, atomic_xchg only works on 8-bit byte fields.  Thus, the macro
usage of LPFC_RXMONITOR_TABLE_IN_USE can be unintentionally truncated
leading to all logic involving the LPFC_RXMONITOR_TABLE_IN_USE macro to not
work properly.

Replace the Rx Table atomic_t indexing logic with a new
lpfc_rx_info_monitor structure that holds a circular ring buffer.  For
locking semantics, a spinlock_t is used.

Link: https://lore.kernel.org/r/20220819011736.14141-4-jsmart2021@gmail.com
Fixes: 17b27ac592 ("scsi: lpfc: Add rx monitoring statistics")
Cc: <stable@vger.kernel.org> # v5.15+
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart 2022-08-18 18:17:32 -07:00 committed by Martin K. Petersen
parent 59b7e210a5
commit bd269188ea
7 changed files with 240 additions and 125 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/scsi/lpfc/lpfc.h
View File

@ -1570,10 +1570,7 @@ struct lpfc_hba {
u32 cgn_acqe_cnt;
/* RX monitor handling for CMF */
struct rxtable_entry *rxtable; /* RX_monitor information */
atomic_t rxtable_idx_head;
#define LPFC_RXMONITOR_TABLE_IN_USE (LPFC_MAX_RXMONITOR_ENTRY + 73)
atomic_t rxtable_idx_tail;
struct lpfc_rx_info_monitor *rx_monitor;
atomic_t rx_max_read_cnt; /* Maximum read bytes */
uint64_t rx_block_cnt;
@ -1622,7 +1619,7 @@ struct lpfc_hba {
#define LPFC_MAX_RXMONITOR_ENTRY 800
#define LPFC_MAX_RXMONITOR_DUMP 32
struct rxtable_entry {
struct rx_info_entry {
uint64_t cmf_bytes; /* Total no of read bytes for CMF_SYNC_WQE */
uint64_t total_bytes; /* Total no of read bytes requested */
uint64_t rcv_bytes; /* Total no of read bytes completed */
@ -1637,6 +1634,13 @@ struct rxtable_entry {
uint32_t timer_interval;
};
struct lpfc_rx_info_monitor {
struct rx_info_entry *ring; /* info organized in a circular buffer */
u32 head_idx, tail_idx; /* index to head/tail of ring */
spinlock_t lock; /* spinlock for ring */
u32 entries; /* storing number entries/size of ring */
};
static inline struct Scsi_Host *
lpfc_shost_from_vport(struct lpfc_vport *vport)
{

8
drivers/scsi/lpfc/lpfc_crtn.h
View File

@ -92,6 +92,14 @@ void lpfc_cgn_dump_rxmonitor(struct lpfc_hba *phba);
void lpfc_cgn_update_stat(struct lpfc_hba *phba, uint32_t dtag);
void lpfc_unblock_requests(struct lpfc_hba *phba);
void lpfc_block_requests(struct lpfc_hba *phba);
int lpfc_rx_monitor_create_ring(struct lpfc_rx_info_monitor *rx_monitor,
u32 entries);
void lpfc_rx_monitor_destroy_ring(struct lpfc_rx_info_monitor *rx_monitor);
void lpfc_rx_monitor_record(struct lpfc_rx_info_monitor *rx_monitor,
struct rx_info_entry *entry);
u32 lpfc_rx_monitor_report(struct lpfc_hba *phba,
struct lpfc_rx_info_monitor *rx_monitor, char *buf,
u32 buf_len, u32 max_read_entries);
void lpfc_mbx_cmpl_local_config_link(struct lpfc_hba *, LPFC_MBOXQ_t *);
void lpfc_mbx_cmpl_reg_login(struct lpfc_hba *, LPFC_MBOXQ_t *);

59
drivers/scsi/lpfc/lpfc_debugfs.c
View File

@ -5531,7 +5531,7 @@ lpfc_rx_monitor_open(struct inode *inode, struct file *file)
if (!debug)
goto out;
debug->buffer = vmalloc(MAX_DEBUGFS_RX_TABLE_SIZE);
debug->buffer = vmalloc(MAX_DEBUGFS_RX_INFO_SIZE);
if (!debug->buffer) {
kfree(debug);
goto out;
@ -5552,57 +5552,18 @@ lpfc_rx_monitor_read(struct file *file, char __user *buf, size_t nbytes,
struct lpfc_rx_monitor_debug *debug = file->private_data;
struct lpfc_hba *phba = (struct lpfc_hba *)debug->i_private;
char *buffer = debug->buffer;
struct rxtable_entry *entry;
int i, len = 0, head, tail, last, start;
head = atomic_read(&phba->rxtable_idx_head);
while (head == LPFC_RXMONITOR_TABLE_IN_USE) {
/* Table is getting updated */
msleep(20);
head = atomic_read(&phba->rxtable_idx_head);
if (!phba->rx_monitor) {
scnprintf(buffer, MAX_DEBUGFS_RX_INFO_SIZE,
"Rx Monitor Info is empty.\n");
} else {
lpfc_rx_monitor_report(phba, phba->rx_monitor, buffer,
MAX_DEBUGFS_RX_INFO_SIZE,
LPFC_MAX_RXMONITOR_ENTRY);
}
tail = atomic_xchg(&phba->rxtable_idx_tail, head);
if (!phba->rxtable || head == tail) {
len += scnprintf(buffer + len, MAX_DEBUGFS_RX_TABLE_SIZE - len,
"Rxtable is empty\n");
goto out;
}
last = (head > tail) ? head : LPFC_MAX_RXMONITOR_ENTRY;
start = tail;
len += scnprintf(buffer + len, MAX_DEBUGFS_RX_TABLE_SIZE - len,
" MaxBPI Tot_Data_CMF Tot_Data_Cmd "
"Tot_Data_Cmpl Lat(us) Avg_IO Max_IO "
"Bsy IO_cnt Info BWutil(ms)\n");
get_table:
for (i = start; i < last; i++) {
entry = &phba->rxtable[i];
len += scnprintf(buffer + len, MAX_DEBUGFS_RX_TABLE_SIZE - len,
"%3d:%12lld %12lld %12lld %12lld "
"%7lldus %8lld %7lld "
"%2d %4d %2d %2d(%2d)\n",
i, entry->max_bytes_per_interval,
entry->cmf_bytes,
entry->total_bytes,
entry->rcv_bytes,
entry->avg_io_latency,
entry->avg_io_size,
entry->max_read_cnt,
entry->cmf_busy,
entry->io_cnt,
entry->cmf_info,
entry->timer_utilization,
entry->timer_interval);
}
if (head != last) {
start = 0;
last = head;
goto get_table;
}
out:
return simple_read_from_buffer(buf, nbytes, ppos, buffer, len);
return simple_read_from_buffer(buf, nbytes, ppos, buffer,
strlen(buffer));
}
static int

2
drivers/scsi/lpfc/lpfc_debugfs.h
View File

@ -282,7 +282,7 @@ struct lpfc_idiag {
void *ptr_private;
};
#define MAX_DEBUGFS_RX_TABLE_SIZE (128 * LPFC_MAX_RXMONITOR_ENTRY)
#define MAX_DEBUGFS_RX_INFO_SIZE (128 * LPFC_MAX_RXMONITOR_ENTRY)
struct lpfc_rx_monitor_debug {
char *i_private;
char *buffer;

83
drivers/scsi/lpfc/lpfc_init.c
View File

@ -5569,38 +5569,12 @@ lpfc_async_link_speed_to_read_top(struct lpfc_hba *phba, uint8_t speed_code)
void
lpfc_cgn_dump_rxmonitor(struct lpfc_hba *phba)
{
struct rxtable_entry *entry;
int cnt = 0, head, tail, last, start;
head = atomic_read(&phba->rxtable_idx_head);
tail = atomic_read(&phba->rxtable_idx_tail);
if (!phba->rxtable || head == tail) {
lpfc_printf_log(phba, KERN_ERR, LOG_CGN_MGMT,
"4411 Rxtable is empty\n");
return;
}
last = tail;
start = head;
/* Display the last LPFC_MAX_RXMONITOR_DUMP entries from the rxtable */
while (start != last) {
if (start)
start--;
else
start = LPFC_MAX_RXMONITOR_ENTRY - 1;
entry = &phba->rxtable[start];
if (!phba->rx_monitor) {
lpfc_printf_log(phba, KERN_INFO, LOG_CGN_MGMT,
"4410 %02d: MBPI %lld Xmit %lld Cmpl %lld "
"Lat %lld ASz %lld Info %02d BWUtil %d "
"Int %d slot %d\n",
cnt, entry->max_bytes_per_interval,
entry->total_bytes, entry->rcv_bytes,
entry->avg_io_latency, entry->avg_io_size,
entry->cmf_info, entry->timer_utilization,
entry->timer_interval, start);
cnt++;
if (cnt >= LPFC_MAX_RXMONITOR_DUMP)
return;
"4411 Rx Monitor Info is empty.\n");
} else {
lpfc_rx_monitor_report(phba, phba->rx_monitor, NULL, 0,
LPFC_MAX_RXMONITOR_DUMP);
}
}
@ -6007,9 +5981,8 @@ lpfc_cmf_timer(struct hrtimer *timer)
{
struct lpfc_hba *phba = container_of(timer, struct lpfc_hba,
cmf_timer);
struct rxtable_entry *entry;
struct rx_info_entry entry;
uint32_t io_cnt;
uint32_t head, tail;
uint32_t busy, max_read;
uint64_t total, rcv, lat, mbpi, extra, cnt;
int timer_interval = LPFC_CMF_INTERVAL;
@ -6129,40 +6102,30 @@ lpfc_cmf_timer(struct hrtimer *timer)
}
/* Save rxmonitor information for debug */
if (phba->rxtable) {
head = atomic_xchg(&phba->rxtable_idx_head,
LPFC_RXMONITOR_TABLE_IN_USE);
entry = &phba->rxtable[head];
entry->total_bytes = total;
entry->cmf_bytes = total + extra;
entry->rcv_bytes = rcv;
entry->cmf_busy = busy;
entry->cmf_info = phba->cmf_active_info;
if (phba->rx_monitor) {
entry.total_bytes = total;
entry.cmf_bytes = total + extra;
entry.rcv_bytes = rcv;
entry.cmf_busy = busy;
entry.cmf_info = phba->cmf_active_info;
if (io_cnt) {
entry->avg_io_latency = div_u64(lat, io_cnt);
entry->avg_io_size = div_u64(rcv, io_cnt);
entry.avg_io_latency = div_u64(lat, io_cnt);
entry.avg_io_size = div_u64(rcv, io_cnt);
} else {
entry->avg_io_latency = 0;
entry->avg_io_size = 0;
entry.avg_io_latency = 0;
entry.avg_io_size = 0;
}
entry->max_read_cnt = max_read;
entry->io_cnt = io_cnt;
entry->max_bytes_per_interval = mbpi;
entry.max_read_cnt = max_read;
entry.io_cnt = io_cnt;
entry.max_bytes_per_interval = mbpi;
if (phba->cmf_active_mode == LPFC_CFG_MANAGED)
entry->timer_utilization = phba->cmf_last_ts;
entry.timer_utilization = phba->cmf_last_ts;
else
entry->timer_utilization = ms;
entry->timer_interval = ms;
entry.timer_utilization = ms;
entry.timer_interval = ms;
phba->cmf_last_ts = 0;
/* Increment rxtable index */
head = (head + 1) % LPFC_MAX_RXMONITOR_ENTRY;
tail = atomic_read(&phba->rxtable_idx_tail);
if (head == tail) {
tail = (tail + 1) % LPFC_MAX_RXMONITOR_ENTRY;
atomic_set(&phba->rxtable_idx_tail, tail);
}
atomic_set(&phba->rxtable_idx_head, head);
lpfc_rx_monitor_record(phba->rx_monitor, &entry);
}
if (phba->cmf_active_mode == LPFC_CFG_MONITOR) {

9
drivers/scsi/lpfc/lpfc_mem.c
View File

@ -344,9 +344,12 @@ lpfc_mem_free_all(struct lpfc_hba *phba)
phba->cgn_i = NULL;
}
/* Free RX table */
kfree(phba->rxtable);
phba->rxtable = NULL;
/* Free RX Monitor */
if (phba->rx_monitor) {
lpfc_rx_monitor_destroy_ring(phba->rx_monitor);
kfree(phba->rx_monitor);
phba->rx_monitor = NULL;
}
/* Free the iocb lookup array */
kfree(psli->iocbq_lookup);

190
drivers/scsi/lpfc/lpfc_sli.c
View File

@ -7959,6 +7959,172 @@ static void lpfc_sli4_dip(struct lpfc_hba *phba)
}
}
/**
* lpfc_rx_monitor_create_ring - Initialize ring buffer for rx_monitor
* @rx_monitor: Pointer to lpfc_rx_info_monitor object
* @entries: Number of rx_info_entry objects to allocate in ring
*
* Return:
* 0 - Success
* ENOMEM - Failure to kmalloc
**/
int lpfc_rx_monitor_create_ring(struct lpfc_rx_info_monitor *rx_monitor,
u32 entries)
{
rx_monitor->ring = kmalloc_array(entries, sizeof(struct rx_info_entry),
GFP_KERNEL);
if (!rx_monitor->ring)
return -ENOMEM;
rx_monitor->head_idx = 0;
rx_monitor->tail_idx = 0;
spin_lock_init(&rx_monitor->lock);
rx_monitor->entries = entries;
return 0;
}
/**
* lpfc_rx_monitor_destroy_ring - Free ring buffer for rx_monitor
* @rx_monitor: Pointer to lpfc_rx_info_monitor object
**/
void lpfc_rx_monitor_destroy_ring(struct lpfc_rx_info_monitor *rx_monitor)
{
spin_lock(&rx_monitor->lock);
kfree(rx_monitor->ring);
rx_monitor->ring = NULL;
rx_monitor->entries = 0;
rx_monitor->head_idx = 0;
rx_monitor->tail_idx = 0;
spin_unlock(&rx_monitor->lock);
}
/**
* lpfc_rx_monitor_record - Insert an entry into rx_monitor's ring
* @rx_monitor: Pointer to lpfc_rx_info_monitor object
* @entry: Pointer to rx_info_entry
*
* Used to insert an rx_info_entry into rx_monitor's ring. Note that this is a
* deep copy of rx_info_entry not a shallow copy of the rx_info_entry ptr.
*
* This is called from lpfc_cmf_timer, which is in timer/softirq context.
*
* In cases of old data overflow, we do a best effort of FIFO order.
**/
void lpfc_rx_monitor_record(struct lpfc_rx_info_monitor *rx_monitor,
struct rx_info_entry *entry)
{
struct rx_info_entry *ring = rx_monitor->ring;
u32 *head_idx = &rx_monitor->head_idx;
u32 *tail_idx = &rx_monitor->tail_idx;
spinlock_t *ring_lock = &rx_monitor->lock;
u32 ring_size = rx_monitor->entries;
spin_lock(ring_lock);
memcpy(&ring[*tail_idx], entry, sizeof(*entry));
*tail_idx = (*tail_idx + 1) % ring_size;
/* Best effort of FIFO saved data */
if (*tail_idx == *head_idx)
*head_idx = (*head_idx + 1) % ring_size;
spin_unlock(ring_lock);
}
/**
* lpfc_rx_monitor_report - Read out rx_monitor's ring
* @phba: Pointer to lpfc_hba object
* @rx_monitor: Pointer to lpfc_rx_info_monitor object
* @buf: Pointer to char buffer that will contain rx monitor info data
* @buf_len: Length buf including null char
* @max_read_entries: Maximum number of entries to read out of ring
*
* Used to dump/read what's in rx_monitor's ring buffer.
*
* If buf is NULL || buf_len == 0, then it is implied that we want to log the
* information to kmsg instead of filling out buf.
*
* Return:
* Number of entries read out of the ring
**/
u32 lpfc_rx_monitor_report(struct lpfc_hba *phba,
struct lpfc_rx_info_monitor *rx_monitor, char *buf,
u32 buf_len, u32 max_read_entries)
{
struct rx_info_entry *ring = rx_monitor->ring;
struct rx_info_entry *entry;
u32 *head_idx = &rx_monitor->head_idx;
u32 *tail_idx = &rx_monitor->tail_idx;
spinlock_t *ring_lock = &rx_monitor->lock;
u32 ring_size = rx_monitor->entries;
u32 cnt = 0;
char tmp[DBG_LOG_STR_SZ] = {0};
bool log_to_kmsg = (!buf || !buf_len) ? true : false;
if (!log_to_kmsg) {
/* clear the buffer to be sure */
memset(buf, 0, buf_len);
scnprintf(buf, buf_len, "\t%-16s%-16s%-16s%-16s%-8s%-8s%-8s"
"%-8s%-8s%-8s%-16s\n",
"MaxBPI", "Tot_Data_CMF",
"Tot_Data_Cmd", "Tot_Data_Cmpl",
"Lat(us)", "Avg_IO", "Max_IO", "Bsy",
"IO_cnt", "Info", "BWutil(ms)");
}
/* Needs to be _bh because record is called from timer interrupt
* context
*/
spin_lock_bh(ring_lock);
while (*head_idx != *tail_idx) {
entry = &ring[*head_idx];
/* Read out this entry's data. */
if (!log_to_kmsg) {
/* If !log_to_kmsg, then store to buf. */
scnprintf(tmp, sizeof(tmp),
"%03d:\t%-16llu%-16llu%-16llu%-16llu%-8llu"
"%-8llu%-8llu%-8u%-8u%-8u%u(%u)\n",
*head_idx, entry->max_bytes_per_interval,
entry->cmf_bytes, entry->total_bytes,
entry->rcv_bytes, entry->avg_io_latency,
entry->avg_io_size, entry->max_read_cnt,
entry->cmf_busy, entry->io_cnt,
entry->cmf_info, entry->timer_utilization,
entry->timer_interval);
/* Check for buffer overflow */
if ((strlen(buf) + strlen(tmp)) >= buf_len)
break;
/* Append entry's data to buffer */
strlcat(buf, tmp, buf_len);
} else {
lpfc_printf_log(phba, KERN_INFO, LOG_CGN_MGMT,
"4410 %02u: MBPI %llu Xmit %llu "
"Cmpl %llu Lat %llu ASz %llu Info %02u "
"BWUtil %u Int %u slot %u\n",
cnt, entry->max_bytes_per_interval,
entry->total_bytes, entry->rcv_bytes,
entry->avg_io_latency,
entry->avg_io_size, entry->cmf_info,
entry->timer_utilization,
entry->timer_interval, *head_idx);
}
*head_idx = (*head_idx + 1) % ring_size;
/* Don't feed more than max_read_entries */
cnt++;
if (cnt >= max_read_entries)
break;
}
spin_unlock_bh(ring_lock);
return cnt;
}
/**
* lpfc_cmf_setup - Initialize idle_stat tracking
* @phba: Pointer to HBA context object.
@ -8133,19 +8299,29 @@ no_cmf:
phba->cmf_interval_rate = LPFC_CMF_INTERVAL;
/* Allocate RX Monitor Buffer */
if (!phba->rxtable) {
phba->rxtable = kmalloc_array(LPFC_MAX_RXMONITOR_ENTRY,
sizeof(struct rxtable_entry),
GFP_KERNEL);
if (!phba->rxtable) {
if (!phba->rx_monitor) {
phba->rx_monitor = kzalloc(sizeof(*phba->rx_monitor),
GFP_KERNEL);
if (!phba->rx_monitor) {
lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
"2644 Failed to alloc memory "
"for RX Monitor Buffer\n");
return -ENOMEM;
}
/* Instruct the rx_monitor object to instantiate its ring */
if (lpfc_rx_monitor_create_ring(phba->rx_monitor,
LPFC_MAX_RXMONITOR_ENTRY)) {
kfree(phba->rx_monitor);
phba->rx_monitor = NULL;
lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
"2645 Failed to alloc memory "
"for RX Monitor's Ring\n");
return -ENOMEM;
}
}
atomic_set(&phba->rxtable_idx_head, 0);
atomic_set(&phba->rxtable_idx_tail, 0);
return 0;
}