From patchwork Tue Mar 8 11:53:24 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Youghandhar Chintala X-Patchwork-Id: 550083 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DD0BDC433FE for ; Tue, 8 Mar 2022 11:53:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231753AbiCHLyk (ORCPT ); Tue, 8 Mar 2022 06:54:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54696 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346412AbiCHLyi (ORCPT ); Tue, 8 Mar 2022 06:54:38 -0500 Received: from alexa-out.qualcomm.com (alexa-out.qualcomm.com [129.46.98.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A789D33899; Tue, 8 Mar 2022 03:53:42 -0800 (PST) Received: from ironmsg09-lv.qualcomm.com ([10.47.202.153]) by alexa-out.qualcomm.com with ESMTP; 08 Mar 2022 03:53:43 -0800 X-QCInternal: smtphost Received: from ironmsg02-blr.qualcomm.com ([10.86.208.131]) by ironmsg09-lv.qualcomm.com with ESMTP/TLS/AES256-SHA; 08 Mar 2022 03:53:41 -0800 X-QCInternal: smtphost Received: from unknown (HELO youghand-linux.qualcomm.com) ([10.206.66.115]) by ironmsg02-blr.qualcomm.com with ESMTP; 08 Mar 2022 17:23:30 +0530 Received: by youghand-linux.qualcomm.com (Postfix, from userid 2370257) id A16E322681; Tue, 8 Mar 2022 17:23:29 +0530 (IST) From: Youghandhar Chintala To: ath10k@lists.infradead.org Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, pillair@codeaurora.org, dianders@chromium.org, kuabhs@chromium.org, briannorris@chromium.org, mpubbise@codeaurora.org, Youghandhar Chintala Subject: [PATCH v5 1/2] mac80211: Add support to trigger sta disconnect on hardware restart Date: Tue, 8 Mar 2022 17:23:24 +0530 Message-Id: <20220308115325.5246-2-youghand@codeaurora.org> X-Mailer: git-send-email 2.29.0 In-Reply-To: <20220308115325.5246-1-youghand@codeaurora.org> References: <20220308115325.5246-1-youghand@codeaurora.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Currently in case of target hardware restart, we just reconfig and re-enable the security keys and enable the network queues to start data traffic back from where it was interrupted. Many ath10k wifi chipsets have sequence numbers for the data packets assigned by firmware and the mac sequence number will restart from zero after target hardware restart leading to mismatch in the sequence number expected by the remote peer vs the sequence number of the frame sent by the target firmware. This mismatch in sequence number will cause out-of-order packets on the remote peer and all the frames sent by the device are dropped until we reach the sequence number which was sent before we restarted the target hardware In order to fix this, we trigger a sta disconnect, in case of target hw restart. After this there will be a fresh connection and thereby avoiding the dropping of frames by remote peer. The right fix would be to pull the entire data path into the host which is not feasible or would need lots of complex changes and will still be inefficient. Tested on ath10k using WCN3990, QCA6174 Signed-off-by: Youghandhar Chintala --- include/net/mac80211.h | 10 ++++++++++ net/mac80211/ieee80211_i.h | 3 +++ net/mac80211/mlme.c | 12 ++++++++++++ net/mac80211/util.c | 33 ++++++++++++++++++++++++++++++--- 4 files changed, 55 insertions(+), 3 deletions(-) diff --git a/include/net/mac80211.h b/include/net/mac80211.h index bd6912d0292b..2f9236e8e33d 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -6064,6 +6064,16 @@ void ieee80211_disconnect(struct ieee80211_vif *vif, bool reconnect); */ void ieee80211_resume_disconnect(struct ieee80211_vif *vif); +/** + * ieee80211_hw_restart_disconnect - disconnect from AP after + * hardware restart + * @vif: &struct ieee80211_vif pointer from the add_interface callback. + * + * Instructs mac80211 to disconnect from the AP after + * hardware restart. + */ +void ieee80211_hw_restart_disconnect(struct ieee80211_vif *vif); + /** * ieee80211_cqm_rssi_notify - inform a configured connection quality monitoring * rssi threshold triggered diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index da35791b8378..7819cdf7ddfa 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -765,6 +765,8 @@ struct ieee80211_if_mesh { * back to wireless media and to the local net stack. * @IEEE80211_SDATA_DISCONNECT_RESUME: Disconnect after resume. * @IEEE80211_SDATA_IN_DRIVER: indicates interface was added to driver + * @IEEE80211_SDATA_DISCONNECT_HW_RESTART: Disconnect after hardware restart + * recovery */ enum ieee80211_sub_if_data_flags { IEEE80211_SDATA_ALLMULTI = BIT(0), @@ -772,6 +774,7 @@ enum ieee80211_sub_if_data_flags { IEEE80211_SDATA_DONT_BRIDGE_PACKETS = BIT(3), IEEE80211_SDATA_DISCONNECT_RESUME = BIT(4), IEEE80211_SDATA_IN_DRIVER = BIT(5), + IEEE80211_SDATA_DISCONNECT_HW_RESTART = BIT(6), }; /** diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 20b57ddf149c..7e5be39dc6cc 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -4863,6 +4863,18 @@ void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) sdata_unlock(sdata); return; } + + if (sdata->flags & IEEE80211_SDATA_DISCONNECT_HW_RESTART) { + sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_HW_RESTART; + mlme_dbg(sdata, "driver requested disconnect after hardware restart\n"); + ieee80211_sta_connection_lost(sdata, + ifmgd->associated->bssid, + WLAN_REASON_UNSPECIFIED, + true); + sdata_unlock(sdata); + return; + } + sdata_unlock(sdata); } #endif diff --git a/net/mac80211/util.c b/net/mac80211/util.c index abc29df6834c..4b791f94751f 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -2321,6 +2321,7 @@ int ieee80211_reconfig(struct ieee80211_local *local) struct cfg80211_sched_scan_request *sched_scan_req; bool sched_scan_stopped = false; bool suspended = local->suspended; + bool in_reconfig = false; /* nothing to do if HW shouldn't run */ if (!local->open_count) @@ -2672,6 +2673,7 @@ int ieee80211_reconfig(struct ieee80211_local *local) drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_RESTART); if (local->in_reconfig) { + in_reconfig = local->in_reconfig; local->in_reconfig = false; barrier(); @@ -2689,6 +2691,15 @@ int ieee80211_reconfig(struct ieee80211_local *local) IEEE80211_QUEUE_STOP_REASON_SUSPEND, false); + if (in_reconfig) { + list_for_each_entry(sdata, &local->interfaces, list) { + if (!ieee80211_sdata_running(sdata)) + continue; + if (sdata->vif.type == NL80211_IFTYPE_STATION) + ieee80211_sta_restart(sdata); + } + } + if (!suspended) return 0; @@ -2718,7 +2729,7 @@ int ieee80211_reconfig(struct ieee80211_local *local) return 0; } -void ieee80211_resume_disconnect(struct ieee80211_vif *vif) +static void ieee80211_reconfig_disconnect(struct ieee80211_vif *vif, u8 flag) { struct ieee80211_sub_if_data *sdata; struct ieee80211_local *local; @@ -2730,19 +2741,35 @@ void ieee80211_resume_disconnect(struct ieee80211_vif *vif) sdata = vif_to_sdata(vif); local = sdata->local; - if (WARN_ON(!local->resuming)) + if (WARN_ON(flag & IEEE80211_SDATA_DISCONNECT_RESUME && + !local->resuming)) + return; + + if (WARN_ON(flag & IEEE80211_SDATA_DISCONNECT_HW_RESTART && + !local->in_reconfig)) return; if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) return; - sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME; + sdata->flags |= flag; mutex_lock(&local->key_mtx); list_for_each_entry(key, &sdata->key_list, list) key->flags |= KEY_FLAG_TAINTED; mutex_unlock(&local->key_mtx); } + +void ieee80211_hw_restart_disconnect(struct ieee80211_vif *vif) +{ + ieee80211_reconfig_disconnect(vif, IEEE80211_SDATA_DISCONNECT_HW_RESTART); +} +EXPORT_SYMBOL_GPL(ieee80211_hw_restart_disconnect); + +void ieee80211_resume_disconnect(struct ieee80211_vif *vif) +{ + ieee80211_reconfig_disconnect(vif, IEEE80211_SDATA_DISCONNECT_RESUME); +} EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect); void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)