From patchwork Wed Aug 28 15:54:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Greear X-Patchwork-Id: 824388 Received: from dispatch1-us1.ppe-hosted.com (dispatch1-us1.ppe-hosted.com [148.163.129.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9E9F318756D for ; Wed, 28 Aug 2024 15:55:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.129.49 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724860513; cv=none; b=mBGci4v5kKiE4dg+JVfUAikOmQZ1XYLrMwy3N8Z+U2jZ9eDFVr1qsD79jCSp+QN3hshtAe08H/BDVfc67oVPAjPkirT9siHNlU1esxCEXtgjA9UtIKZkB10x94yfLKaSj+/FTCv/6oK0bLUNqzRXJv3sNFa+vKMp8vlIlY0f2y8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724860513; c=relaxed/simple; bh=c/vTvF+/xKi1ir3gqqvg+ojTMC6SuxtbztjDi9Fn+vA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=hn5yxRdGM4ckJHbeFDbwUwJ/WeWtd0M79A6lCIaH/KIu8NEh9VLC/6sLq9fVnTgR0O6DjE1moherfhwLDxbVWzJjBAcitIoTBan94uCRZQpD0IuGxzvRjoXE299wAeA0V8EHwfBwa0tHcPIr0Aul0s+fH5CE/SYHDVijxTX5aPI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=candelatech.com; spf=pass smtp.mailfrom=candelatech.com; dkim=pass (1024-bit key) header.d=candelatech.com header.i=@candelatech.com header.b=jCxcT4Qf; arc=none smtp.client-ip=148.163.129.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=candelatech.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=candelatech.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=candelatech.com header.i=@candelatech.com header.b="jCxcT4Qf" X-Virus-Scanned: Proofpoint Essentials engine Received: from mail3.candelatech.com (mail.candelatech.com [208.74.158.173]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id D65EDA8007F for ; Wed, 28 Aug 2024 15:55:03 +0000 (UTC) Received: from ben-dt5.candelatech.com (unknown [50.251.239.81]) by mail3.candelatech.com (Postfix) with ESMTP id F08A913C2B0; Wed, 28 Aug 2024 08:55:00 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 mail3.candelatech.com F08A913C2B0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=candelatech.com; s=default; t=1724860501; bh=c/vTvF+/xKi1ir3gqqvg+ojTMC6SuxtbztjDi9Fn+vA=; h=From:To:Cc:Subject:Date:From; b=jCxcT4QfAwzyruOb4AwwubAjr+nkGizWzITo3Wuns+sGbtxSaTjMys8KH6ePnHZ2i TbvejjxiPtiNGuZEE4hpK0A6xB3/PykvG4smaO/ywmQXKSqZs95pfdgf4/dkE/E0Qe bLZ2SqBMCzjLuUsheB5R0Snu5Ras83gKwHm0okmI= From: greearb@candelatech.com To: linux-wireless@vger.kernel.org Cc: Ben Greear Subject: [RFC PATCH 1/2] wifi: iwlwifi: Report link-id for transmitted frames. Date: Wed, 28 Aug 2024 08:54:57 -0700 Message-ID: <20240828155458.1990497-1-greearb@candelatech.com> X-Mailer: git-send-email 2.42.0 Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MDID: 1724860504-uLj7hZZbQnSj X-MDID-O: us5; ut7; 1724860504; uLj7hZZbQnSj; ; f7146c1849a4b08a52804beb1c1cdf45 From: Ben Greear This will let upper stack properly record stats per link. Signed-off-by: Ben Greear --- Patch is against my internal tree at this point. Will port to upstream kernel once general approach is ironed out. drivers/net/wireless/intel/iwlwifi/mvm/tx.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c index e7cb6dcde182..42bb21a976fc 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c @@ -1963,6 +1963,9 @@ static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm, u8 lq_color; u16 next_reclaimed, seq_ctl; bool is_ndp = false; + struct ieee80211_link_sta *link_sta; + + link_sta = rcu_dereference(mvm->fw_id_to_link_sta[sta_id]); __skb_queue_head_init(&skbs); @@ -1989,6 +1992,10 @@ static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm, memset(&info->status, 0, sizeof(info->status)); info->flags &= ~(IEEE80211_TX_STAT_ACK | IEEE80211_TX_STAT_TX_FILTERED); + if (link_sta) { + info->control.flags &= ~(u32_encode_bits(0xF, IEEE80211_TX_CTRL_MLO_LINK)); + info->control.flags |= u32_encode_bits(link_sta->link_id, IEEE80211_TX_CTRL_MLO_LINK); + } /* inform mac80211 about what happened with the frame */ switch (status & TX_STATUS_MSK) { @@ -2334,6 +2341,7 @@ static void iwl_mvm_tx_reclaim(struct iwl_mvm *mvm, int sta_id, int tid, struct iwl_mvm_sta *mvmsta = NULL; struct sk_buff *skb; int freed; + struct ieee80211_link_sta *link_sta; if (WARN_ONCE(sta_id >= mvm->fw->ucode_capa.num_stations || tid > IWL_MAX_TID_COUNT, @@ -2350,6 +2358,8 @@ static void iwl_mvm_tx_reclaim(struct iwl_mvm *mvm, int sta_id, int tid, return; } + link_sta = rcu_dereference(mvm->fw_id_to_link_sta[sta_id]); + __skb_queue_head_init(&reclaimed_skbs); /* @@ -2437,6 +2447,11 @@ static void iwl_mvm_tx_reclaim(struct iwl_mvm *mvm, int sta_id, int tid, info->flags |= IEEE80211_TX_STAT_ACK; else info->flags &= ~IEEE80211_TX_STAT_ACK; + + if (link_sta) { + info->control.flags &= ~(u32_encode_bits(0xF, IEEE80211_TX_CTRL_MLO_LINK)); + info->control.flags |= u32_encode_bits(link_sta->link_id, IEEE80211_TX_CTRL_MLO_LINK); + } } /* From patchwork Wed Aug 28 15:54:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Greear X-Patchwork-Id: 823501 Received: from dispatch1-us1.ppe-hosted.com (dispatch1-us1.ppe-hosted.com [67.231.154.183]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DA82C1A0718 for ; Wed, 28 Aug 2024 15:55:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=67.231.154.183 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724860514; cv=none; b=tMRTweeP+qgnFv2m57e2tfnAW108/+yuVIE7OOWXEr9CNYJ6XLr9s/DmWv6jgIXJrf2QlH/P7x6iVB+5Mx8YhZbVqcTTPzBK24rlIeQGMIy8LwFAdpgwNCGJVav2qhEEL1Z8sE/SNymyI0XhYAsRVvCyZlPiH33N+KmjAmQ5AmI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724860514; c=relaxed/simple; bh=wXKcKGYsjX99JuCAJGRTlWp9N4PsOOawC2zwGIkWZxw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=n/qY2FUiV1oOgXtM/m3xKd0xkrVuv486/Ojjx3mG+K0ArMtB9CnjFyjTNlqqzLehXn5TNhcEvzo7ojs+H4aTCvZW3aLO4uB783/Q8q+BGSuSsly5NW8uGMaG42hfhiWgLugCnfAeq+6oXGlOQdas6utkhS3ytPC5MciyLPnwnII= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=candelatech.com; spf=pass smtp.mailfrom=candelatech.com; dkim=pass (1024-bit key) header.d=candelatech.com header.i=@candelatech.com header.b=B86xvkiN; arc=none smtp.client-ip=67.231.154.183 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=candelatech.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=candelatech.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=candelatech.com header.i=@candelatech.com header.b="B86xvkiN" X-Virus-Scanned: Proofpoint Essentials engine Received: from mail3.candelatech.com (mail.candelatech.com [208.74.158.173]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id 264CB2C0066 for ; Wed, 28 Aug 2024 15:55:04 +0000 (UTC) Received: from ben-dt5.candelatech.com (unknown [50.251.239.81]) by mail3.candelatech.com (Postfix) with ESMTP id 61AA913C2B1; Wed, 28 Aug 2024 08:55:03 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 mail3.candelatech.com 61AA913C2B1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=candelatech.com; s=default; t=1724860503; bh=wXKcKGYsjX99JuCAJGRTlWp9N4PsOOawC2zwGIkWZxw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=B86xvkiNd0UYCAMyAaXAIC3AeOHrRuAzgl4zoNqWYQTHPdruN4BVJCN2ckez1xjc1 KCAX/WlAqCZTLO2poSiEiCkualwVVIVAcrFwExqJHuY115+HnjTyBEPxnWMZe9Dfaa D/9oDm+O9+4xZgYckBrMHGQh0OQToSowVZ1B3X2g= From: greearb@candelatech.com To: linux-wireless@vger.kernel.org Cc: Ben Greear Subject: [RFC PATCH 2/2] wifi: mac80211: Assign tx-stats to the proper link. Date: Wed, 28 Aug 2024 08:54:58 -0700 Message-ID: <20240828155458.1990497-2-greearb@candelatech.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20240828155458.1990497-1-greearb@candelatech.com> References: <20240828155458.1990497-1-greearb@candelatech.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MDID: 1724860504-XNa3fuznqhqD X-MDID-O: us5; at1; 1724860504; XNa3fuznqhqD; ; f7146c1849a4b08a52804beb1c1cdf45 From: Ben Greear For drivers that can report the tx link-id, account tx stats against that link. If we cannot determine tx link, then use deflink. Signed-off-by: Ben Greear --- Patch is against my internal tree, won't apply to upstream. Will port to upstream once details are ironed out. net/mac80211/status.c | 105 +++++++++++++++++++++++++++--------------- 1 file changed, 67 insertions(+), 38 deletions(-) diff --git a/net/mac80211/status.c b/net/mac80211/status.c index 71ef0b7bd9a1..b844d2f207aa 100644 --- a/net/mac80211/status.c +++ b/net/mac80211/status.c @@ -41,6 +41,23 @@ void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, } EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); +static struct link_sta_info* +ieee80211_get_tx_link_sta(struct sta_info *sta, struct ieee80211_tx_info *info) +{ + u8 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); + struct link_sta_info *l_sta_info; + + if (!sta) + return NULL; + + if (link_id != IEEE80211_LINK_UNSPECIFIED) { + l_sta_info = rcu_access_pointer(sta->link[link_id]); + if (l_sta_info) + return l_sta_info; + } + return &sta->deflink; +} + static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, struct sta_info *sta, struct sk_buff *skb) @@ -48,6 +65,7 @@ static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct ieee80211_hdr *hdr = (void *)skb->data; int ac; + struct link_sta_info *link_sta = ieee80211_get_tx_link_sta(sta, info); if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER | IEEE80211_TX_CTL_AMPDU | @@ -72,7 +90,7 @@ static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, info->flags |= IEEE80211_TX_INTFL_RETRANSMISSION; info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; - sta->deflink.status_stats.filtered++; + link_sta->status_stats.filtered++; /* * Clear more-data bit on filtered frames, it might be set @@ -826,6 +844,7 @@ static void ieee80211_lost_packet(struct sta_info *sta, { unsigned long pkt_time = STA_LOST_PKT_TIME; unsigned int pkt_thr = STA_LOST_PKT_THRESHOLD; + struct link_sta_info *link_sta; /* If driver relies on its own algorithm for station kickout, skip * mac80211 packet loss mechanism. @@ -838,7 +857,8 @@ static void ieee80211_lost_packet(struct sta_info *sta, !(info->flags & IEEE80211_TX_STAT_AMPDU)) return; - sta->deflink.status_stats.lost_packets++; + link_sta = ieee80211_get_tx_link_sta(sta, info); + link_sta->status_stats.lost_packets++; if (sta->sta.tdls) { pkt_time = STA_LOST_TDLS_PKT_TIME; pkt_thr = STA_LOST_PKT_THRESHOLD; @@ -851,14 +871,14 @@ static void ieee80211_lost_packet(struct sta_info *sta, * mechanism. * For non-TDLS, use STA_LOST_PKT_THRESHOLD and STA_LOST_PKT_TIME */ - if (sta->deflink.status_stats.lost_packets < pkt_thr || - !time_after(jiffies, sta->deflink.status_stats.last_pkt_time + pkt_time)) + if (link_sta->status_stats.lost_packets < pkt_thr || + !time_after(jiffies, link_sta->status_stats.last_pkt_time + pkt_time)) return; cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, - sta->deflink.status_stats.lost_packets, + link_sta->status_stats.lost_packets, GFP_ATOMIC); - sta->deflink.status_stats.lost_packets = 0; + link_sta->status_stats.lost_packets = 0; } static int ieee80211_tx_get_rates(struct ieee80211_hw *hw, @@ -970,8 +990,12 @@ static void __ieee80211_tx_status(struct ieee80211_hw *hw, fc = hdr->frame_control; if (status->sta) { + struct link_sta_info *link_sta; + sta = container_of(status->sta, struct sta_info, sta); + link_sta = ieee80211_get_tx_link_sta(sta, info); + if (info->flags & IEEE80211_TX_STATUS_EOSP) clear_sta_flag(sta, WLAN_STA_SP); @@ -988,7 +1012,7 @@ static void __ieee80211_tx_status(struct ieee80211_hw *hw, if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) && (ieee80211_is_data(hdr->frame_control)) && (rates_idx != -1)) - sta->deflink.tx_stats.last_rate = + link_sta->tx_stats.last_rate = info->status.rates[rates_idx]; if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && @@ -1034,9 +1058,9 @@ static void __ieee80211_tx_status(struct ieee80211_hw *hw, return; } else if (ieee80211_is_data_present(fc)) { if (!acked && !noack_success) - sta->deflink.status_stats.msdu_failed[tid]++; + link_sta->status_stats.msdu_failed[tid]++; - sta->deflink.status_stats.msdu_retries[tid] += + link_sta->status_stats.msdu_retries[tid] += retry_count; } @@ -1147,12 +1171,15 @@ void ieee80211_tx_status_ext(struct ieee80211_hw *hw, int rates_idx, retry_count; bool acked, noack_success, ack_signal_valid; u16 tx_time_est; + struct link_sta_info *link_sta; if (pubsta) { sta = container_of(pubsta, struct sta_info, sta); + link_sta = ieee80211_get_tx_link_sta(sta, info); + if (status->n_rates) - sta->deflink.tx_stats.last_rate_info = + link_sta->tx_stats.last_rate_info = status->rates[status->n_rates - 1].rate_idx; } @@ -1185,8 +1212,8 @@ void ieee80211_tx_status_ext(struct ieee80211_hw *hw, #endif if (!acked && !noack_success) - sta->deflink.status_stats.retry_failed++; - sta->deflink.status_stats.retry_count += retry_count; + link_sta->status_stats.retry_failed++; + link_sta->status_stats.retry_count += retry_count; if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { if (sdata->vif.type == NL80211_IFTYPE_STATION && @@ -1198,13 +1225,12 @@ void ieee80211_tx_status_ext(struct ieee80211_hw *hw, #ifdef CONFIG_MAC80211_DEBUG_STA_COUNTERS do_stats = true; #endif - sta->deflink.status_stats.last_ack = jiffies; + link_sta->status_stats.last_ack = jiffies; - if (sta->deflink.status_stats.lost_packets) - sta->deflink.status_stats.lost_packets = 0; + link_sta->status_stats.lost_packets = 0; /* Track when last packet was ACKed */ - sta->deflink.status_stats.last_pkt_time = jiffies; + link_sta->status_stats.last_pkt_time = jiffies; /* Reset connection monitor */ if (sdata->vif.type == NL80211_IFTYPE_STATION && @@ -1212,10 +1238,10 @@ void ieee80211_tx_status_ext(struct ieee80211_hw *hw, sdata->u.mgd.probe_send_count = 0; if (ack_signal_valid) { - sta->deflink.status_stats.last_ack_signal = + link_sta->status_stats.last_ack_signal = (s8)info->status.ack_signal; - sta->deflink.status_stats.ack_signal_filled = true; - ewma_avg_signal_add(&sta->deflink.status_stats.avg_ack_signal, + link_sta->status_stats.ack_signal_filled = true; + ewma_avg_signal_add(&link_sta->status_stats.avg_ack_signal, -info->status.ack_signal); } } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) { @@ -1242,40 +1268,40 @@ void ieee80211_tx_status_ext(struct ieee80211_hw *hw, u8 mcs = 0; struct ieee80211_tx_rate *txrt = &(info->status.rates[rates_idx]); if (txrt->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) - sta->deflink.tx_stats.msdu_40++; + link_sta->tx_stats.msdu_40++; else if (txrt->flags & IEEE80211_TX_RC_80_MHZ_WIDTH) - sta->deflink.tx_stats.msdu_80++; + link_sta->tx_stats.msdu_80++; else if (txrt->flags & IEEE80211_TX_RC_160_MHZ_WIDTH) - sta->deflink.tx_stats.msdu_160++; + link_sta->tx_stats.msdu_160++; else - sta->deflink.tx_stats.msdu_20++; + link_sta->tx_stats.msdu_20++; if (txrt->flags & IEEE80211_TX_RC_MCS) { nss = (txrt->idx / 8); mcs = txrt->idx - (nss * 8); - sta->deflink.tx_stats.msdu_ht++; + link_sta->tx_stats.msdu_ht++; } else if (txrt->flags & IEEE80211_TX_RC_VHT_MCS) { mcs = ieee80211_rate_get_vht_mcs(txrt); nss = ieee80211_rate_get_vht_nss(txrt); nss -= 1; - sta->deflink.tx_stats.msdu_vht++; + link_sta->tx_stats.msdu_vht++; } else if (pubsta && status->rates && - (sta->deflink.tx_stats.last_rate_info.flags & RATE_INFO_FLAGS_HE_MCS)) { + (link_sta->tx_stats.last_rate_info.flags & RATE_INFO_FLAGS_HE_MCS)) { /* get info from status->rate */ - mcs = sta->deflink.tx_stats.last_rate_info.mcs; - nss = sta->deflink.tx_stats.last_rate_info.nss - 1; - sta->deflink.tx_stats.msdu_he++; + mcs = link_sta->tx_stats.last_rate_info.mcs; + nss = link_sta->tx_stats.last_rate_info.nss - 1; + link_sta->tx_stats.msdu_he++; } else { mcs = txrt->idx; - sta->deflink.tx_stats.msdu_legacy++; + link_sta->tx_stats.msdu_legacy++; } - if (nss > (ARRAY_SIZE(sta->deflink.tx_stats.msdu_nss) - 1)) - nss = ARRAY_SIZE(sta->deflink.tx_stats.msdu_nss) - 1; - if (mcs > (ARRAY_SIZE(sta->deflink.tx_stats.msdu_rate_idx) - 1)) - mcs = ARRAY_SIZE(sta->deflink.tx_stats.msdu_rate_idx) - 1; - sta->deflink.tx_stats.msdu_nss[nss]++; - sta->deflink.tx_stats.msdu_rate_idx[mcs]++; + if (nss > (ARRAY_SIZE(link_sta->tx_stats.msdu_nss) - 1)) + nss = ARRAY_SIZE(link_sta->tx_stats.msdu_nss) - 1; + if (mcs > (ARRAY_SIZE(link_sta->tx_stats.msdu_rate_idx) - 1)) + mcs = ARRAY_SIZE(link_sta->tx_stats.msdu_rate_idx) - 1; + link_sta->tx_stats.msdu_nss[nss]++; + link_sta->tx_stats.msdu_rate_idx[mcs]++; } #endif @@ -1326,8 +1352,11 @@ void ieee80211_tx_rate_update(struct ieee80211_hw *hw, rate_control_tx_status(local, &status); - if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) - sta->deflink.tx_stats.last_rate = info->status.rates[0]; + if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { + struct link_sta_info *link_sta = ieee80211_get_tx_link_sta(sta, info); + + link_sta->tx_stats.last_rate = info->status.rates[0]; + } } EXPORT_SYMBOL(ieee80211_tx_rate_update);