ath6kl: Add endpoint_stats debugfs file

This file can be used to fetch endpoint statistics counters and
to clear them by writing 0 to it.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

diff --git a/drivers/net/wireless/ath/ath6kl/debug.c b/drivers/net/wireless/ath/ath6kl/debug.c
index ba3f23d71150ee0bf0054efbc42530cac4ac3569..b9bf28d728445045379b53318bc3146602fec939 100644 (file)
--- a/drivers/net/wireless/ath/ath6kl/debug.c
+++ b/drivers/net/wireless/ath/ath6kl/debug.c
@@ -595,6 +595,105 @@ static const struct file_operations fops_credit_dist_stats = {
        .llseek = default_llseek,
 };
 
+static unsigned int print_endpoint_stat(struct htc_target *target, char *buf,
+                                       unsigned int buf_len, unsigned int len,
+                                       int offset, const char *name)
+{
+       int i;
+       struct htc_endpoint_stats *ep_st;
+       u32 *counter;
+
+       len += scnprintf(buf + len, buf_len - len, "%s:", name);
+       for (i = 0; i < ENDPOINT_MAX; i++) {
+               ep_st = &target->endpoint[i].ep_st;
+               counter = ((u32 *) ep_st) + (offset / 4);
+               len += scnprintf(buf + len, buf_len - len, " %u", *counter);
+       }
+       len += scnprintf(buf + len, buf_len - len, "\n");
+
+       return len;
+}
+
+static ssize_t ath6kl_endpoint_stats_read(struct file *file,
+                                         char __user *user_buf,
+                                         size_t count, loff_t *ppos)
+{
+       struct ath6kl *ar = file->private_data;
+       struct htc_target *target = ar->htc_target;
+       char *buf;
+       unsigned int buf_len, len = 0;
+       ssize_t ret_cnt;
+
+       buf_len = 1000 + ENDPOINT_MAX * 100;
+       buf = kzalloc(buf_len, GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+
+#define EPSTAT(name)                                                   \
+       len = print_endpoint_stat(target, buf, buf_len, len,            \
+                                 offsetof(struct htc_endpoint_stats, name), \
+                                 #name)
+       EPSTAT(cred_low_indicate);
+       EPSTAT(tx_issued);
+       EPSTAT(tx_pkt_bundled);
+       EPSTAT(tx_bundles);
+       EPSTAT(tx_dropped);
+       EPSTAT(tx_cred_rpt);
+       EPSTAT(cred_rpt_from_rx);
+       EPSTAT(cred_rpt_ep0);
+       EPSTAT(cred_from_rx);
+       EPSTAT(cred_from_other);
+       EPSTAT(cred_from_ep0);
+       EPSTAT(cred_cosumd);
+       EPSTAT(cred_retnd);
+       EPSTAT(rx_pkts);
+       EPSTAT(rx_lkahds);
+       EPSTAT(rx_bundl);
+       EPSTAT(rx_bundle_lkahd);
+       EPSTAT(rx_bundle_from_hdr);
+       EPSTAT(rx_alloc_thresh_hit);
+       EPSTAT(rxalloc_thresh_byte);
+#undef EPSTAT
+
+       if (len > buf_len)
+               len = buf_len;
+
+       ret_cnt = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+       kfree(buf);
+       return ret_cnt;
+}
+
+static ssize_t ath6kl_endpoint_stats_write(struct file *file,
+                                          const char __user *user_buf,
+                                          size_t count, loff_t *ppos)
+{
+       struct ath6kl *ar = file->private_data;
+       struct htc_target *target = ar->htc_target;
+       int ret, i;
+       u32 val;
+       struct htc_endpoint_stats *ep_st;
+
+       ret = kstrtou32_from_user(user_buf, count, 0, &val);
+       if (ret)
+               return ret;
+       if (val == 0) {
+               for (i = 0; i < ENDPOINT_MAX; i++) {
+                       ep_st = &target->endpoint[i].ep_st;
+                       memset(ep_st, 0, sizeof(*ep_st));
+               }
+       }
+
+       return count;
+}
+
+static const struct file_operations fops_endpoint_stats = {
+       .open = ath6kl_debugfs_open,
+       .read = ath6kl_endpoint_stats_read,
+       .write = ath6kl_endpoint_stats_write,
+       .owner = THIS_MODULE,
+       .llseek = default_llseek,
+};
+
 static unsigned long ath6kl_get_num_reg(void)
 {
        int i;
@@ -901,6 +1000,9 @@ int ath6kl_debug_init(struct ath6kl *ar)
        debugfs_create_file("credit_dist_stats", S_IRUSR, ar->debugfs_phy, ar,
                            &fops_credit_dist_stats);
 
+       debugfs_create_file("endpoint_stats", S_IRUSR | S_IWUSR,
+                           ar->debugfs_phy, ar, &fops_endpoint_stats);
+
        debugfs_create_file("fwlog", S_IRUSR, ar->debugfs_phy, ar,
                            &fops_fwlog);