The Firmware sends HTT event to host whenever there is a
backpressure on RX rings, Handling such event and dumping
info on the console under the "ATH11K_DBG_DP_HTT" debug level.
Fetching RX ring backpressure histogram from FW via htt_stats debugfs.
#echo "24" > /sys/kernel/debug/ath11k/ipq8074/macX/htt_stats_type
#cat /sys/kernel/debug/ath11k/ipq8074/macX/htt_stats
Signed-off-by: Vikas Patel <vikpatel@xxxxxxxxxxxxxx>
Signed-off-by: Sriram R <srirrama@xxxxxxxxxxxxxx>
---
v3: Rebased on top of master
drivers/net/wireless/ath/ath11k/debug.h | 2 ++
drivers/net/wireless/ath/ath11k/debug_htt_stats.c | 44 +++++++++++++++++++++++
drivers/net/wireless/ath/ath11k/debug_htt_stats.h | 28 +++++++++++++++
drivers/net/wireless/ath/ath11k/dp.h | 8 +++++
drivers/net/wireless/ath/ath11k/dp_rx.c | 26 ++++++++++++++
5 files changed, 108 insertions(+)
diff --git a/drivers/net/wireless/ath/ath11k/debug.h b/drivers/net/wireless/ath/ath11k/debug.h
index 427d3ac..97e7306 100644
--- a/drivers/net/wireless/ath/ath11k/debug.h
+++ b/drivers/net/wireless/ath/ath11k/debug.h
@@ -53,6 +53,8 @@ enum ath11k_dbg_htt_ext_stats_type {
ATH11K_DBG_HTT_EXT_STATS_TWT_SESSIONS = 20,
ATH11K_DBG_HTT_EXT_STATS_REO_RESOURCE_STATS = 21,
ATH11K_DBG_HTT_EXT_STATS_TX_SOUNDING_INFO = 22,
+ ATH11K_DBG_HTT_EXT_STATS_PDEV_OBSS_PD_STATS = 23,
+ ATH11K_DBG_HTT_EXT_STATS_RING_BACKPRESSURE_STATS = 24,
/* keep this last */
ATH11K_DBG_HTT_NUM_EXT_STATS,
diff --git a/drivers/net/wireless/ath/ath11k/debug_htt_stats.c b/drivers/net/wireless/ath/ath11k/debug_htt_stats.c
index f44dec8..5db0c27 100644
--- a/drivers/net/wireless/ath/ath11k/debug_htt_stats.c
+++ b/drivers/net/wireless/ath/ath11k/debug_htt_stats.c
@@ -3854,6 +3854,47 @@ htt_print_pdev_obss_pd_stats_tlv_v(const void *tag_buf,
stats_req->buf_len = len;
}
+static inline void htt_print_backpressure_stats_tlv_v(const u32 *tag_buf,
+ u8 *data)
+{
+ struct debug_htt_stats_req *stats_req =
+ (struct debug_htt_stats_req *)data;
+ struct htt_ring_backpressure_stats_tlv *htt_stats_buf =
+ (struct htt_ring_backpressure_stats_tlv *)tag_buf;
+ int i;
+ u8 *buf = stats_req->buf;
+ u32 len = stats_req->buf_len;
+ u32 buf_len = ATH11K_HTT_STATS_BUF_SIZE;
+
+ len += HTT_DBG_OUT(buf + len, buf_len - len, "pdev_id = %u",
+ htt_stats_buf->pdev_id);
+ len += HTT_DBG_OUT(buf + len, buf_len - len, "current_head_idx = %u",
+ htt_stats_buf->current_head_idx);
+ len += HTT_DBG_OUT(buf + len, buf_len - len, "current_tail_idx = %u",
+ htt_stats_buf->current_tail_idx);
+ len += HTT_DBG_OUT(buf + len, buf_len - len, "num_htt_msgs_sent = %u",
+ htt_stats_buf->num_htt_msgs_sent);
+ len += HTT_DBG_OUT(buf + len, buf_len - len,
+ "backpressure_time_ms = %u",
+ htt_stats_buf->backpressure_time_ms);
+
+ for (i = 0; i < 5; i++)
+ len += HTT_DBG_OUT(buf + len, buf_len - len,
+ "backpressure_hist_%u = %u",
+ i + 1, htt_stats_buf->backpressure_hist[i]);
+
+ len += HTT_DBG_OUT(buf + len, buf_len - len,
+ "============================");
+
+ if (len >= buf_len) {
+ buf[buf_len - 1] = 0;
+ stats_req->buf_len = buf_len - 1;
+ } else {
+ buf[len] = 0;
+ stats_req->buf_len = len;
+ }
+}
+
static inline void htt_htt_stats_debug_dump(const u32 *tag_buf,
struct debug_htt_stats_req *stats_req)
{
@@ -4246,6 +4287,9 @@ static int ath11k_dbg_htt_ext_stats_parse(struct ath11k_base *ab,
case HTT_STATS_PDEV_OBSS_PD_TAG:
htt_print_pdev_obss_pd_stats_tlv_v(tag_buf, stats_req);
break;
+ case HTT_STATS_RING_BACKPRESSURE_STATS_TAG:
+ htt_print_backpressure_stats_tlv_v(tag_buf, user_data);
+ break;
default:
break;
}
diff --git a/drivers/net/wireless/ath/ath11k/debug_htt_stats.h b/drivers/net/wireless/ath/ath11k/debug_htt_stats.h
index 4bdb62d..23a6baa 100644
--- a/drivers/net/wireless/ath/ath11k/debug_htt_stats.h
+++ b/drivers/net/wireless/ath/ath11k/debug_htt_stats.h
@@ -100,6 +100,8 @@ enum htt_tlv_tag_t {
HTT_STATS_SCHED_TXQ_SCHED_ORDER_SU_TAG = 86,
HTT_STATS_SCHED_TXQ_SCHED_INELIGIBILITY_TAG = 87,
HTT_STATS_PDEV_OBSS_PD_TAG = 88,
+ HTT_STATS_HW_WAR_TAG = 89,
+ HTT_STATS_RING_BACKPRESSURE_STATS_TAG = 90,
HTT_STATS_MAX_TAG,
};
@@ -1659,4 +1661,30 @@ struct htt_pdev_obss_pd_stats_tlv {
};
void ath11k_debug_htt_stats_init(struct ath11k *ar);
+
+struct htt_ring_backpressure_stats_tlv {
+ u32 pdev_id;
+ u32 current_head_idx;
+ u32 current_tail_idx;
+ u32 num_htt_msgs_sent;
+ /* Time in milliseconds for which the ring has been in
+ * its current backpressure condition
+ */
+ u32 backpressure_time_ms;
+ /* backpressure_hist - histogram showing how many times
+ * different degrees of backpressure duration occurred:
+ * Index 0 indicates the number of times ring was
+ * continuously in backpressure state for 100 - 200ms.
+ * Index 1 indicates the number of times ring was
+ * continuously in backpressure state for 200 - 300ms.
+ * Index 2 indicates the number of times ring was
+ * continuously in backpressure state for 300 - 400ms.
+ * Index 3 indicates the number of times ring was
+ * continuously in backpressure state for 400 - 500ms.
+ * Index 4 indicates the number of times ring was
+ * continuously in backpressure state beyond 500ms.
+ */
+ u32 backpressure_hist[5];
+};
+
#endif
diff --git a/drivers/net/wireless/ath/ath11k/dp.h b/drivers/net/wireless/ath/ath11k/dp.h
index f9b66de..551f9c9 100644
--- a/drivers/net/wireless/ath/ath11k/dp.h
+++ b/drivers/net/wireless/ath/ath11k/dp.h
@@ -936,6 +936,7 @@ enum htt_t2h_msg_type {
HTT_T2H_MSG_TYPE_PEER_UNMAP = 0x1f,
HTT_T2H_MSG_TYPE_PPDU_STATS_IND = 0x1d,
HTT_T2H_MSG_TYPE_EXT_STATS_CONF = 0x1c,
+ HTT_T2H_MSG_TYPE_BKPRESSURE_EVENT_IND = 0x24,
};
#define HTT_TARGET_VERSION_MAJOR 3
@@ -984,6 +985,13 @@ struct htt_resp_msg {
};
} __packed;
+#define HTT_BACKPRESSURE_EVENT_PDEV_ID_M GENMASK(15, 8)
+#define HTT_BACKPRESSURE_EVENT_RING_TYPE_M GENMASK(23, 16)
+#define HTT_BACKPRESSURE_EVENT_RING_ID_M GENMASK(31, 24)
+
+#define HTT_BACKPRESSURE_EVENT_HP_M GENMASK(15, 0)
+#define HTT_BACKPRESSURE_EVENT_TP_M GENMASK(31, 16)
+
/* ppdu stats
*
* @details
diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c
index aba2dca..fbb67c9 100644
--- a/drivers/net/wireless/ath/ath11k/dp_rx.c
+++ b/drivers/net/wireless/ath/ath11k/dp_rx.c
@@ -1494,6 +1494,29 @@ static void ath11k_htt_pktlog(struct ath11k_base *ab, struct sk_buff *skb)
trace_ath11k_htt_pktlog(ar, data->payload, hdr->size);
}
+static void ath11k_htt_backpressure_event_handler(struct ath11k_base *ab,
+ struct sk_buff *skb)
+{
+ u32 *data = (u32 *)skb->data;
+ u8 pdev_id, ring_type, ring_id;
+ u16 hp, tp;
+ u32 backpressure_time;
+
+ pdev_id = FIELD_GET(HTT_BACKPRESSURE_EVENT_PDEV_ID_M, *data);
+ ring_type = FIELD_GET(HTT_BACKPRESSURE_EVENT_RING_TYPE_M, *data);
+ ring_id = FIELD_GET(HTT_BACKPRESSURE_EVENT_RING_ID_M, *data);
+ ++data;
+
+ hp = FIELD_GET(HTT_BACKPRESSURE_EVENT_HP_M, *data);
+ tp = FIELD_GET(HTT_BACKPRESSURE_EVENT_TP_M, *data);
+ ++data;
+
+ backpressure_time = *data;
+
+ ath11k_dbg(ab, ATH11K_DBG_DP_HTT, "htt backpressure event, pdev %d, ring type %d,ring id %d, hp %d tp %d, backpressure time %d\n",
+ pdev_id, ring_type, ring_id, hp, tp, backpressure_time);
+}
+
void ath11k_dp_htt_htc_t2h_msg_handler(struct ath11k_base *ab,
struct sk_buff *skb)
{
@@ -1543,6 +1566,9 @@ void ath11k_dp_htt_htc_t2h_msg_handler(struct ath11k_base *ab,
case HTT_T2H_MSG_TYPE_PKTLOG:
ath11k_htt_pktlog(ab, skb);
break;
+ case HTT_T2H_MSG_TYPE_BKPRESSURE_EVENT_IND:
+ ath11k_htt_backpressure_event_handler(ab, skb);
+ break;
default:
ath11k_warn(ab, "htt event %d not handled\n", type);
break;
--
2.7.4
