From: Thiraviyam Mariyappan <tmariyap@codeaurora.org>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: ath11k@lists.infradead.org, linux-wireless@vger.kernel.org
Subject: Re: [PATCHv2] mac80211: increment rx stats according to USES_RSS flag
Date: Thu, 06 May 2021 23:19:06 +0530 [thread overview]
Message-ID: <df6e33fe198e179f1c1f31ca6d55e995@codeaurora.org> (raw)
In-Reply-To: <ec30381c062e3eb87abb724641a15331cfc3d11c.camel@sipsolutions.net>
On 2021-04-23 13:28, Johannes Berg wrote:
> On Wed, 2021-04-21 at 22:18 +0530, Thiraviyam Mariyappan wrote:
>> In case of Mesh fast_rx is not applicable, but still USES_RSS can be
>> enabled from driver when parallel RX is supported by HW/Driver,
>> right?
>
> Yes, I guess that's true.
>
>> Hence checked for USES_RSS support to update per cpu stats.Please
>> correct me if the meaning of USES_RSS is misunderstood and it applies
>> only when fast_rx for a STA is enabled.
>>
>
> Well, actually using multi-queue is pointless or even
> counter-productive
> when you don't have fast-RX, since then you'll run into a common lock,
> and doing much processing on multiple CPUs but under a common lock
> might
> well be worse than doing it on a single CPU in the first place, since
> you'll bounce the lock around all the time.
>
> However, you're right that the driver might generally advertise
> USES_RSS, but then not do it for mesh, but that throws off some
> statistics.
>
> Something like this might then be a much better fix though?
Below fix good to me and working fine.
>
>
> diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
> index ec6973ee88ef..f87e883862d9 100644
> --- a/net/mac80211/sta_info.c
> +++ b/net/mac80211/sta_info.c
> @@ -2092,7 +2092,7 @@ sta_get_last_rx_stats(struct sta_info *sta)
> struct ieee80211_local *local = sta->local;
> int cpu;
>
> - if (!ieee80211_hw_check(&local->hw, USES_RSS))
> + if (!sta->pcpu_rx_stats)
> return stats;
>
> for_each_possible_cpu(cpu) {
> @@ -2192,9 +2192,7 @@ static void sta_set_tidstats(struct sta_info
> *sta,
> int cpu;
>
> if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
> - if (!ieee80211_hw_check(&local->hw, USES_RSS))
> - tidstats->rx_msdu +=
> - sta_get_tidstats_msdu(&sta->rx_stats, tid);
> + tidstats->rx_msdu += sta_get_tidstats_msdu(&sta->rx_stats, tid);
>
> if (sta->pcpu_rx_stats) {
> for_each_possible_cpu(cpu) {
> @@ -2308,8 +2306,7 @@ void sta_set_sinfo(struct sta_info *sta, struct
> station_info *sinfo,
>
> if (!(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_RX_BYTES64) |
> BIT_ULL(NL80211_STA_INFO_RX_BYTES)))) {
> - if (!ieee80211_hw_check(&local->hw, USES_RSS))
> - sinfo->rx_bytes += sta_get_stats_bytes(&sta->rx_stats);
> + sinfo->rx_bytes += sta_get_stats_bytes(&sta->rx_stats);
>
> if (sta->pcpu_rx_stats) {
> for_each_possible_cpu(cpu) {
>
>
> johannes
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prev parent reply other threads:[~2021-05-06 17:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-17 11:56 [PATCHv2] mac80211: increment rx stats according to USES_RSS flag Thiraviyam Mariyappan
2021-04-08 9:39 ` Johannes Berg
2021-04-08 10:01 ` Johannes Berg
2021-04-21 16:48 ` Thiraviyam Mariyappan
2021-04-23 7:58 ` Johannes Berg
2021-05-06 17:49 ` Thiraviyam Mariyappan [this message]
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