diff options
Diffstat (limited to 'net/mac80211/debugfs.c')
| -rw-r--r-- | net/mac80211/debugfs.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c index 5c090e41d9bb..fa16e54980a1 100644 --- a/net/mac80211/debugfs.c +++ b/net/mac80211/debugfs.c @@ -17,6 +17,172 @@ #define DEBUGFS_FORMAT_BUFFER_SIZE 100 +#define TX_LATENCY_BIN_DELIMTER_C ',' +#define TX_LATENCY_BIN_DELIMTER_S "," +#define TX_LATENCY_BINS_DISABLED "enable(bins disabled)\n" +#define TX_LATENCY_DISABLED "disable\n" + + +/* + * Display if Tx latency statistics & bins are enabled/disabled + */ +static ssize_t sta_tx_latency_stat_read(struct file *file, + char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct ieee80211_local *local = file->private_data; + struct ieee80211_tx_latency_bin_ranges *tx_latency; + char *buf; + int bufsz, i, ret; + int pos = 0; + + rcu_read_lock(); + + tx_latency = rcu_dereference(local->tx_latency); + + if (tx_latency && tx_latency->n_ranges) { + bufsz = tx_latency->n_ranges * 15; + buf = kzalloc(bufsz, GFP_ATOMIC); + if (!buf) + goto err; + + for (i = 0; i < tx_latency->n_ranges; i++) + pos += scnprintf(buf + pos, bufsz - pos, "%d,", + tx_latency->ranges[i]); + pos += scnprintf(buf + pos, bufsz - pos, "\n"); + } else if (tx_latency) { + bufsz = sizeof(TX_LATENCY_BINS_DISABLED) + 1; + buf = kzalloc(bufsz, GFP_ATOMIC); + if (!buf) + goto err; + + pos += scnprintf(buf + pos, bufsz - pos, "%s\n", + TX_LATENCY_BINS_DISABLED); + } else { + bufsz = sizeof(TX_LATENCY_DISABLED) + 1; + buf = kzalloc(bufsz, GFP_ATOMIC); + if (!buf) + goto err; + + pos += scnprintf(buf + pos, bufsz - pos, "%s\n", + TX_LATENCY_DISABLED); + } + + rcu_read_unlock(); + + ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos); + kfree(buf); + + return ret; +err: + rcu_read_unlock(); + return -ENOMEM; +} + +/* + * Receive input from user regarding Tx latency statistics + * The input should indicate if Tx latency statistics and bins are + * enabled/disabled. + * If bins are enabled input should indicate the amount of different bins and + * their ranges. Each bin will count how many Tx frames transmitted within the + * appropriate latency. + * Legal input is: + * a) "enable(bins disabled)" - to enable only general statistics + * b) "a,b,c,d,...z" - to enable general statistics and bins, where all are + * numbers and a < b < c < d.. < z + * c) "disable" - disable all statistics + * NOTE: must configure Tx latency statistics bins before stations connected. + */ + +static ssize_t sta_tx_latency_stat_write(struct file *file, + const char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct ieee80211_local *local = file->private_data; + char buf[128] = {}; + char *bins = buf; + char *token; + int buf_size, i, alloc_size; + int prev_bin = 0; + int n_ranges = 0; + int ret = count; + struct ieee80211_tx_latency_bin_ranges *tx_latency; + + if (sizeof(buf) <= count) + return -EINVAL; + buf_size = count; + if (copy_from_user(buf, userbuf, buf_size)) + return -EFAULT; + + mutex_lock(&local->sta_mtx); + + /* cannot change config once we have stations */ + if (local->num_sta) + goto unlock; + + tx_latency = + rcu_dereference_protected(local->tx_latency, + lockdep_is_held(&local->sta_mtx)); + + /* disable Tx statistics */ + if (!strcmp(buf, TX_LATENCY_DISABLED)) { + if (!tx_latency) + goto unlock; + rcu_assign_pointer(local->tx_latency, NULL); + synchronize_rcu(); + kfree(tx_latency); + goto unlock; + } + + /* Tx latency already enabled */ + if (tx_latency) + goto unlock; + + if (strcmp(TX_LATENCY_BINS_DISABLED, buf)) { + /* check how many bins and between what ranges user requested */ + token = buf; + while (*token != '\0') { + if (*token == TX_LATENCY_BIN_DELIMTER_C) + n_ranges++; + token++; + } + n_ranges++; + } + + alloc_size = sizeof(struct ieee80211_tx_latency_bin_ranges) + + n_ranges * sizeof(u32); + tx_latency = kzalloc(alloc_size, GFP_ATOMIC); + if (!tx_latency) { + ret = -ENOMEM; + goto unlock; + } + tx_latency->n_ranges = n_ranges; + for (i = 0; i < n_ranges; i++) { /* setting bin ranges */ + token = strsep(&bins, TX_LATENCY_BIN_DELIMTER_S); + sscanf(token, "%d", &tx_latency->ranges[i]); + /* bins values should be in ascending order */ + if (prev_bin >= tx_latency->ranges[i]) { + ret = -EINVAL; + kfree(tx_latency); + goto unlock; + } + prev_bin = tx_latency->ranges[i]; + } + rcu_assign_pointer(local->tx_latency, tx_latency); + +unlock: + mutex_unlock(&local->sta_mtx); + + return ret; +} + +static const struct file_operations stats_tx_latency_ops = { + .write = sta_tx_latency_stat_write, + .read = sta_tx_latency_stat_read, + .open = simple_open, + .llseek = generic_file_llseek, +}; + int mac80211_format_buffer(char __user *userbuf, size_t count, loff_t *ppos, char *fmt, ...) { @@ -315,4 +481,6 @@ void debugfs_hw_add(struct ieee80211_local *local) DEBUGFS_DEVSTATS_ADD(dot11RTSFailureCount); DEBUGFS_DEVSTATS_ADD(dot11FCSErrorCount); DEBUGFS_DEVSTATS_ADD(dot11RTSSuccessCount); + + DEBUGFS_DEVSTATS_ADD(tx_latency); } |