diff options
| author |   Dedy Lansky <dlansky@codeaurora.org> | 2018-07-24 10:44:24 +0300 |
|---|---|---|
| committer |   Kalle Valo <kvalo@codeaurora.org> | 2018-07-31 10:59:50 +0300 |
| commit | a24a3d6abb978d4abc25d541e787981e7ef555c8 (patch) | |
| tree | 78fd5e07de7c7f3308968c09d70935cb2a076e02 /drivers/net/wireless/ath/wil6210/txrx.c | |
| parent | wil6210: drop Rx packets with L2 error indication from HW (diff) | |
| download | linux-a24a3d6abb978d4abc25d541e787981e7ef555c8.tar.xz linux-a24a3d6abb978d4abc25d541e787981e7ef555c8.zip | |
wil6210: add TX latency statistics
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>
Diffstat (limited to 'drivers/net/wireless/ath/wil6210/txrx.c')
| -rw-r--r-- | drivers/net/wireless/ath/wil6210/txrx.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/wil6210/txrx.c b/drivers/net/wireless/ath/wil6210/txrx.c index 9ac867445a5b..6707af60a24d 100644 --- a/drivers/net/wireless/ath/wil6210/txrx.c +++ b/drivers/net/wireless/ath/wil6210/txrx.c @@ -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++; |