ath10k: replenish HTT RX buffers in a tasklet

This starves FW RX ring buffer in case of
excessive RX. This prevents from CPU being
overwhelmed by RX indications/completions by
naturally forbiddin FW to submit more RX.

This fixes RX starvation on slow machines when
under heavy RX traffic.

kvalo: remove extra newline

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

diff --git a/drivers/net/wireless/ath/ath10k/htt.h b/drivers/net/wireless/ath/ath10k/htt.h
index e090902..1a337e9 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/htt.h
+++ b/drivers/net/wireless/ath/ath10k/htt.h
@@ -19,6 +19,7 @@
 #define _HTT_H_
 
 #include <linux/bug.h>
+#include <linux/interrupt.h>
 
 #include "htc.h"
 #include "rx_desc.h"
@@ -1268,6 +1269,7 @@ struct ath10k_htt {
        /* set if host-fw communication goes haywire
         * used to avoid further failures */
        bool rx_confused;
+       struct tasklet_struct rx_replenish_task;
 };
 
 #define RX_HTT_HDR_STATUS_LEN 64
@@ -1308,6 +1310,10 @@ struct htt_rx_desc {
 #define HTT_RX_BUF_SIZE 1920
 #define HTT_RX_MSDU_SIZE (HTT_RX_BUF_SIZE - (int)sizeof(struct htt_rx_desc))
 
+/* Refill a bunch of RX buffers for each refill round so that FW/HW can handle
+ * aggregated traffic more nicely. */
+#define ATH10K_HTT_MAX_NUM_REFILL 16
+
 /*
  * DMA_MAP expects the buffer to be an integral number of cache lines.
  * Rather than checking the actual cache line size, this code makes a

diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c
index c4637f1..90d4f74 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/htt_rx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
@@ -182,10 +182,27 @@ static int ath10k_htt_rx_ring_fill_n(struct ath10k_htt *htt, int num)
 
 static void ath10k_htt_rx_msdu_buff_replenish(struct ath10k_htt *htt)
 {
-       int ret, num_to_fill;
+       int ret, num_deficit, num_to_fill;
 
+       /* Refilling the whole RX ring buffer proves to be a bad idea. The
+        * reason is RX may take up significant amount of CPU cycles and starve
+        * other tasks, e.g. TX on an ethernet device while acting as a bridge
+        * with ath10k wlan interface. This ended up with very poor performance
+        * once CPU the host system was overwhelmed with RX on ath10k.
+        *
+        * By limiting the number of refills the replenishing occurs
+        * progressively. This in turns makes use of the fact tasklets are
+        * processed in FIFO order. This means actual RX processing can starve
+        * out refilling. If there's not enough buffers on RX ring FW will not
+        * report RX until it is refilled with enough buffers. This
+        * automatically balances load wrt to CPU power.
+        *
+        * This probably comes at a cost of lower maximum throughput but
+        * improves the avarage and stability. */
        spin_lock_bh(&htt->rx_ring.lock);
-       num_to_fill = htt->rx_ring.fill_level - htt->rx_ring.fill_cnt;
+       num_deficit = htt->rx_ring.fill_level - htt->rx_ring.fill_cnt;
+       num_to_fill = min(ATH10K_HTT_MAX_NUM_REFILL, num_deficit);
+       num_deficit -= num_to_fill;
        ret = ath10k_htt_rx_ring_fill_n(htt, num_to_fill);
        if (ret == -ENOMEM) {
                /*
@@ -196,6 +213,8 @@ static void ath10k_htt_rx_msdu_buff_replenish(struct ath10k_htt *htt)
                 */
                mod_timer(&htt->rx_ring.refill_retry_timer, jiffies +
                          msecs_to_jiffies(HTT_RX_RING_REFILL_RETRY_MS));
+       } else if (num_deficit > 0) {
+               tasklet_schedule(&htt->rx_replenish_task);
        }
        spin_unlock_bh(&htt->rx_ring.lock);
 }
@@ -217,6 +236,7 @@ void ath10k_htt_rx_detach(struct ath10k_htt *htt)
        int sw_rd_idx = htt->rx_ring.sw_rd_idx.msdu_payld;
 
        del_timer_sync(&htt->rx_ring.refill_retry_timer);
+       tasklet_kill(&htt->rx_replenish_task);
 
        while (sw_rd_idx != __le32_to_cpu(*(htt->rx_ring.alloc_idx.vaddr))) {
                struct sk_buff *skb =
@@ -446,6 +466,12 @@ static int ath10k_htt_rx_amsdu_pop(struct ath10k_htt *htt,
        return msdu_chaining;
 }
 
+static void ath10k_htt_rx_replenish_task(unsigned long ptr)
+{
+       struct ath10k_htt *htt = (struct ath10k_htt *)ptr;
+       ath10k_htt_rx_msdu_buff_replenish(htt);
+}
+
 int ath10k_htt_rx_attach(struct ath10k_htt *htt)
 {
        dma_addr_t paddr;
@@ -506,6 +532,9 @@ int ath10k_htt_rx_attach(struct ath10k_htt *htt)
        if (__ath10k_htt_rx_ring_fill_n(htt, htt->rx_ring.fill_level))
                goto err_fill_ring;
 
+       tasklet_init(&htt->rx_replenish_task, ath10k_htt_rx_replenish_task,
+                    (unsigned long)htt);
+
        ath10k_dbg(ATH10K_DBG_BOOT, "htt rx ring size %d fill_level %d\n",
                   htt->rx_ring.size, htt->rx_ring.fill_level);
        return 0;
@@ -956,7 +985,7 @@ static void ath10k_htt_rx_handler(struct ath10k_htt *htt,
                }
        }
 
-       ath10k_htt_rx_msdu_buff_replenish(htt);
+       tasklet_schedule(&htt->rx_replenish_task);
 }
 
 static void ath10k_htt_rx_frag_handler(struct ath10k_htt *htt,