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mac80211: enable collecting station statistics per-CPU

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If the driver advertises the new HW flag USE_RSS, make the
station statistics on the fast-rx path per-CPU. This will
enable calling the RX in parallel, only hitting locking or
shared cachelines when the fast-RX path isn't available.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2016-03-31 20:02:11 +03:00
parent 49ddf8e6e2
commit c9c5962b56
5 changed files with 142 additions and 46 deletions
Download patch file Download diff file Expand all files Collapse all files

37
net/mac80211/rx.c
View file

@ -3528,6 +3528,8 @@ void ieee80211_check_fast_rx(struct sta_info *sta)
ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
/* fast-rx doesn't do reordering */
if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
!ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
@ -3678,6 +3680,10 @@ static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
u8 da[ETH_ALEN];
u8 sa[ETH_ALEN];
} addrs __aligned(2);
struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
if (fast_rx->uses_rss)
stats = this_cpu_ptr(sta->pcpu_rx_stats);
/* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
* to a common data structure; drivers can implement that per queue
@ -3759,29 +3765,32 @@ static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
}
/* statistics part of ieee80211_rx_h_sta_process() */
sta->rx_stats.last_rx = jiffies;
sta->rx_stats.last_rate = sta_stats_encode_rate(status);
stats->last_rx = jiffies;
stats->last_rate = sta_stats_encode_rate(status);
sta->rx_stats.fragments++;
stats->fragments++;
if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
sta->rx_stats.last_signal = status->signal;
ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
stats->last_signal = status->signal;
if (!fast_rx->uses_rss)
ewma_signal_add(&sta->rx_stats_avg.signal,
-status->signal);
}
if (status->chains) {
int i;
sta->rx_stats.chains = status->chains;
stats->chains = status->chains;
for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
int signal = status->chain_signal[i];
if (!(status->chains & BIT(i)))
continue;
sta->rx_stats.chain_signal_last[i] = signal;
ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
-signal);
stats->chain_signal_last[i] = signal;
if (!fast_rx->uses_rss)
ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
-signal);
}
}
/* end of statistics */
@ -3806,10 +3815,10 @@ static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
* for non-QoS-data frames. Here we know it's a data
* frame, so count MSDUs.
*/
u64_stats_update_begin(&sta->rx_stats.syncp);
sta->rx_stats.msdu[rx->seqno_idx]++;
sta->rx_stats.bytes += orig_len;
u64_stats_update_end(&sta->rx_stats.syncp);
u64_stats_update_begin(&stats->syncp);
stats->msdu[rx->seqno_idx]++;
stats->bytes += orig_len;
u64_stats_update_end(&stats->syncp);
if (fast_rx->internal_forward) {
struct sta_info *dsta = sta_info_get(rx->sdata, skb->data);
@ -3840,7 +3849,7 @@ static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
return true;
drop:
dev_kfree_skb(skb);
sta->rx_stats.dropped++;
stats->dropped++;
return true;
}