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wil6210: add TX latency statistics

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Collect statistics of TX latency. The latency is measured from the time
the HW gets aware of new SKB to transmit until the HW indicates tx
complete for this SKB.
The statistics are shown via new "tx_latency" debugfs.

Signed-off-by: Dedy Lansky <dlansky@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Dedy Lansky
2018-07-24 10:44:24 +03:00
committed by Kalle Valo
parent e15af41c05
commit a24a3d6abb
6 changed files with 188 additions and 0 deletions
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38
drivers/net/wireless/ath/wil6210/txrx.c
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@@ -1693,6 +1693,11 @@ static int __wil_tx_vring_tso(struct wil6210_priv *wil, struct wil6210_vif *vif,
*/
wmb();
if (wil->tx_latency)
*(ktime_t *)&skb->cb = ktime_get();
else
memset(skb->cb, 0, sizeof(ktime_t));
wil_w(wil, vring->hwtail, vring->swhead);
return 0;
@@ -1844,6 +1849,11 @@ static int __wil_tx_ring(struct wil6210_priv *wil, struct wil6210_vif *vif,
*/
wmb();
if (wil->tx_latency)
*(ktime_t *)&skb->cb = ktime_get();
else
memset(skb->cb, 0, sizeof(ktime_t));
wil_w(wil, ring->hwtail, ring->swhead);
return 0;
@@ -2065,6 +2075,31 @@ netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
return NET_XMIT_DROP;
}
void wil_tx_latency_calc(struct wil6210_priv *wil, struct sk_buff *skb,
struct wil_sta_info *sta)
{
int skb_time_us;
int bin;
if (!wil->tx_latency)
return;
if (ktime_to_ms(*(ktime_t *)&skb->cb) == 0)
return;
skb_time_us = ktime_us_delta(ktime_get(), *(ktime_t *)&skb->cb);
bin = skb_time_us / wil->tx_latency_res;
bin = min_t(int, bin, WIL_NUM_LATENCY_BINS - 1);
wil_dbg_txrx(wil, "skb time %dus => bin %d\n", skb_time_us, bin);
sta->tx_latency_bins[bin]++;
sta->stats.tx_latency_total_us += skb_time_us;
if (skb_time_us < sta->stats.tx_latency_min_us)
sta->stats.tx_latency_min_us = skb_time_us;
if (skb_time_us > sta->stats.tx_latency_max_us)
sta->stats.tx_latency_max_us = skb_time_us;
}
/**
* Clean up transmitted skb's from the Tx VRING
*
@@ -2151,6 +2186,9 @@ int wil_tx_complete(struct wil6210_vif *vif, int ringid)
if (stats) {
stats->tx_packets++;
stats->tx_bytes += skb->len;
wil_tx_latency_calc(wil, skb,
&wil->sta[cid]);
}
} else {
ndev->stats.tx_errors++;