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Thu, 4 Apr 2024 19:00:12 GMT Received: from hu-mdharane-blr.qualcomm.com (10.80.80.8) by nasanex01a.na.qualcomm.com (10.52.223.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.4; Thu, 4 Apr 2024 12:00:10 -0700 From: Manish Dharanenthiran To: CC: , Manish Dharanenthiran , Rameshkumar Sundaram Subject: [RFC v2 1/2] wifi: cfg80211/mac80211: Introduce nl80211 commands to support MLD link removal offload Date: Fri, 5 Apr 2024 00:29:49 +0530 Message-ID: <20240404185950.776062-2-quic_mdharane@quicinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240404185950.776062-1-quic_mdharane@quicinc.com> References: <20240404185950.776062-1-quic_mdharane@quicinc.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nasanex01a.na.qualcomm.com (10.52.223.231) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: b83GLI2_QW_dlLqeACGXJzlqdkHRkq82 X-Proofpoint-GUID: b83GLI2_QW_dlLqeACGXJzlqdkHRkq82 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-04-04_15,2024-04-04_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 phishscore=0 mlxscore=0 impostorscore=0 clxscore=1015 mlxlogscore=999 malwarescore=0 spamscore=0 adultscore=0 bulkscore=0 priorityscore=1501 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2404010003 definitions=main-2404040134 This is a preparation for supporting Multi-Link reconfigure link removal procedure[IEEE P802.11be/D5.0 - 35.3.6.3 Removing affiliated APs] for driver which supports offloaded Multi-Link reconfigure link removal. Multi-Link reconfigure link removal offloaded drivers will take care of updating the reconfiguration MLE in self and partner beacons. It also updates the AP removal timer automatically and notifies once the counter is expired. For such drivers AP link removal count(TBTT) and reconfiguration MLE needs to be passed from userspace. AP link removal count indicates the number of beacons the reconfiguration MLE will be present, after which the link will be removed. To support this, NL80211_ATTR_AP_REMOVAL_COUNT and NL80211_ATTR_IE are used. In beacon offloaded drivers, to indicate status of ongoing link removal, add two new commands NL80211_CMD_LINK_REMOVAL_STARTED, NL80211_CMD_LINK_REMOVAL_COMPLETED. NL80211_CMD_LINK_REMOVAL_STARTED will update timestamp of first beacon sent with reconfiguration MLE using NL80211_ATTR_TSF attribute. Co-developed-by: Rameshkumar Sundaram Signed-off-by: Rameshkumar Sundaram Signed-off-by: Manish Dharanenthiran --- include/net/cfg80211.h | 52 +++++++++++++++++++++ include/uapi/linux/nl80211.h | 30 +++++++++++++ net/wireless/core.h | 2 + net/wireless/nl80211.c | 87 ++++++++++++++++++++++++++++++++++++ net/wireless/rdev-ops.h | 17 +++++++ net/wireless/trace.h | 58 ++++++++++++++++++++++++ net/wireless/util.c | 17 +++++++ 7 files changed, 263 insertions(+) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 2e2be4fd2bb6..e016fd096373 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -4169,6 +4169,23 @@ struct mgmt_frame_regs { u32 global_mcast_stypes, interface_mcast_stypes; }; +/** + * struct cfg80211_link_reconfig_removal_params - Contains params needed for + * link reconfig removal + * @link_removal_cntdown: TBTT countdown value until which the beacon with ML + * reconfigure element will be sent. + * @reconfigure_elem: ML reconfigure element to be updated in beacon in the link going to be + * removed and in all affiliated links. + * @elem_len: ML reconfigure element length + * @link_id: Link id of the link to be removed. + */ +struct cfg80211_link_reconfig_removal_params { + u16 link_removal_cntdown; + const u8 *reconfigure_elem; + size_t elem_len; + unsigned int link_id; +}; + /** * struct cfg80211_ops - backend description for wireless configuration * @@ -4570,6 +4587,11 @@ struct mgmt_frame_regs { * * @set_hw_timestamp: Enable/disable HW timestamping of TM/FTM frames. * @set_ttlm: set the TID to link mapping. + * + * @link_reconfig_remove: Notifies the driver about the link to be + * scheduled for removal with ML reconfigure element built for that particular + * link along with the TBTT count until which the beacon with ML + * reconfigure element should be sent. */ struct cfg80211_ops { int (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow); @@ -4931,6 +4953,9 @@ struct cfg80211_ops { struct cfg80211_set_hw_timestamp *hwts); int (*set_ttlm)(struct wiphy *wiphy, struct net_device *dev, struct cfg80211_ttlm_params *params); + int (*link_reconfig_remove)(struct wiphy *wiphy, + struct net_device *dev, + const struct cfg80211_link_reconfig_removal_params *params); }; /* @@ -9509,4 +9534,31 @@ ssize_t wiphy_locked_debugfs_write(struct wiphy *wiphy, struct file *file, void *data); #endif +/** + * cfg80211_update_link_reconfig_remove_update - Inform userspace about + * the removal status of link which is scheduled for removal + * @dev: the device on which the operation is requested + * @link_id: Link which is undergoing removal + * @tbtt_count: Current tbtt_count to be updated. + * @tsf: Beacon's timestamp value + * @cmd: Inform started or completed action to userspace based on the value + * + * This function is used to inform userspace about the ongoing link removal + * status. 'NL80211_CMD_LINK_REMOVAL_STARTED' is issued when the first beacon with + * ML reconfigure element is sent out. This event can be used by userspace to start + * the BTM in case of AP mode. And, NL80211_CMD_LINK_REMOVAL_COMPLETED is issued + * when the last beacon is sent with ML reconfigure element. This is used to + * initiate the deletion of that link, also to trigger deauth/disassoc for the + * associated peer(s). + * + * Note: This API is currently used by drivers which supports offloaded + * Multi-Link reconfigure link removal. Returns failure if FEATURE FLAG is not + * set or success if NL message is sent. + */ +int +cfg80211_update_link_reconfig_remove_update(struct net_device *dev, + unsigned int link_id, + u8 tbtt_count, u64 tsf, + enum nl80211_commands cmd); + #endif /* __NET_CFG80211_H */ diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h index f917bc6c9b6f..5d09140fd070 100644 --- a/include/uapi/linux/nl80211.h +++ b/include/uapi/linux/nl80211.h @@ -1304,6 +1304,10 @@ * @NL80211_CMD_REMOVE_LINK: Remove a link from an interface. This may come * without %NL80211_ATTR_MLO_LINK_ID as an easy way to remove all links * in preparation for e.g. roaming to a regular (non-MLO) AP. + * To initiate link removal procedure, set below attributes, + * %NL80211_ATTR_AP_REMOVAL_COUNT - AP removal timer count(TBTT) + * %NL80211_ATTR_IE - ML reconfigure Information element + * Can be extended to update multiple TBTT & element(s). * * @NL80211_CMD_ADD_LINK_STA: Add a link to an MLD station * @NL80211_CMD_MODIFY_LINK_STA: Modify a link of an MLD station @@ -1329,6 +1333,14 @@ * %NL80211_ATTR_MLO_TTLM_ULINK attributes are used to specify the * TID to Link mapping for downlink/uplink traffic. * + * @NL80211_CMD_LINK_REMOVAL_STARTED: Once first beacon with reconfiguration MLE + * is sent, userspace is notified with the TBTT and TSF value to indicate + * timestamp of that beacon using %NL80211_ATTR_AP_REMOVAL_COUNT and + * %NL80211_ATTR_TSF respectively. + * + * @NL80211_CMD_LINK_REMOVAL_COMPLETED: Once last beacon with reconfiguration + * MLE is sent, userspace is notified with completion. + * * @NL80211_CMD_MAX: highest used command number * @__NL80211_CMD_AFTER_LAST: internal use */ @@ -1586,6 +1598,10 @@ enum nl80211_commands { NL80211_CMD_SET_TID_TO_LINK_MAPPING, + NL80211_CMD_LINK_REMOVAL_STARTED, + + NL80211_CMD_LINK_REMOVAL_COMPLETED, + /* add new commands above here */ /* used to define NL80211_CMD_MAX below */ @@ -2856,6 +2872,13 @@ enum nl80211_commands { * %NL80211_CMD_ASSOCIATE indicating the SPP A-MSDUs * are used on this connection * + * @NL80211_ATTR_AP_REMOVAL_COUNT: (u16) TBTT count up-to which reconfiguration + * MLE is sent. Also, userspace will be notified with this count once the + * first beacon with reconfiguration MLE is sent. + * + * @NL80211_ATTR_TSF: (u64) TSF value when the first beacon with reconfiguration + * MLE is sent. + * * @NUM_NL80211_ATTR: total number of nl80211_attrs available * @NL80211_ATTR_MAX: highest attribute number currently defined * @__NL80211_ATTR_AFTER_LAST: internal use @@ -3401,6 +3424,9 @@ enum nl80211_attrs { NL80211_ATTR_ASSOC_SPP_AMSDU, + NL80211_ATTR_AP_REMOVAL_COUNT, + NL80211_ATTR_TSF, + /* add attributes here, update the policy in nl80211.c */ __NL80211_ATTR_AFTER_LAST, @@ -6545,6 +6571,9 @@ enum nl80211_feature_flags { * (signaling and payload protected) A-MSDUs and this shall be advertised * in the RSNXE. * + * @NL80211_EXT_FEATURE_MLD_LINK_REMOVAL_OFFLOAD: Driver/device which supports + * ML reconfig link removal offload. + * * @NUM_NL80211_EXT_FEATURES: number of extended features. * @MAX_NL80211_EXT_FEATURES: highest extended feature index. */ @@ -6620,6 +6649,7 @@ enum nl80211_ext_feature_index { NL80211_EXT_FEATURE_OWE_OFFLOAD_AP, NL80211_EXT_FEATURE_DFS_CONCURRENT, NL80211_EXT_FEATURE_SPP_AMSDU_SUPPORT, + NL80211_EXT_FEATURE_MLD_LINK_REMOVAL_OFFLOAD, /* add new features before the definition below */ NUM_NL80211_EXT_FEATURES, diff --git a/net/wireless/core.h b/net/wireless/core.h index 118f2f619828..ce1a1aa048e2 100644 --- a/net/wireless/core.h +++ b/net/wireless/core.h @@ -552,6 +552,8 @@ void cfg80211_remove_links(struct wireless_dev *wdev); int cfg80211_remove_virtual_intf(struct cfg80211_registered_device *rdev, struct wireless_dev *wdev); void cfg80211_wdev_release_link_bsses(struct wireless_dev *wdev, u16 link_mask); +int cfg80211_link_reconfig_remove(struct wireless_dev *wdev, + const struct cfg80211_link_reconfig_removal_params *params); /** * struct cfg80211_colocated_ap - colocated AP information diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index b4edba6b0b7b..6a1a9e370cde 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -826,6 +826,8 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = { [NL80211_ATTR_MLO_TTLM_DLINK] = NLA_POLICY_EXACT_LEN(sizeof(u16) * 8), [NL80211_ATTR_MLO_TTLM_ULINK] = NLA_POLICY_EXACT_LEN(sizeof(u16) * 8), [NL80211_ATTR_ASSOC_SPP_AMSDU] = { .type = NLA_FLAG }, + [NL80211_ATTR_AP_REMOVAL_COUNT] = { .type = NLA_U8 }, + [NL80211_ATTR_TSF] = { .type = NLA_U64 }, }; /* policy for the key attributes */ @@ -16103,6 +16105,7 @@ static int nl80211_remove_link(struct sk_buff *skb, struct genl_info *info) unsigned int link_id = nl80211_link_id(info->attrs); struct net_device *dev = info->user_ptr[1]; struct wireless_dev *wdev = dev->ieee80211_ptr; + struct cfg80211_link_reconfig_removal_params params = {}; /* cannot remove if there's no link */ if (!info->attrs[NL80211_ATTR_MLO_LINK_ID]) @@ -16115,6 +16118,30 @@ static int nl80211_remove_link(struct sk_buff *skb, struct genl_info *info) return -EINVAL; } + if (info->attrs[NL80211_ATTR_AP_REMOVAL_COUNT]) { + /* Parsing and sending information to driver about ML + * reconfiguration is supported only when + * NL80211_EXT_FEATURE_MLD_LINK_REMOVAL_OFFLOAD is set + */ + if (!wiphy_ext_feature_isset(wdev->wiphy, + NL80211_EXT_FEATURE_MLD_LINK_REMOVAL_OFFLOAD)) + return -EOPNOTSUPP; + + /* If AP removal count is present, it is mandatory to have IE + * attribute as well, return error if not present + */ + if (!info->attrs[NL80211_ATTR_IE]) + return -EINVAL; + + params.reconfigure_elem = nla_data(info->attrs[NL80211_ATTR_IE]); + params.elem_len = nla_len(info->attrs[NL80211_ATTR_IE]); + params.link_removal_cntdown = + nla_get_u16(info->attrs[NL80211_ATTR_AP_REMOVAL_COUNT]); + params.link_id = link_id; + + return cfg80211_link_reconfig_remove(wdev, ¶ms); + } + cfg80211_remove_link(wdev, link_id); return 0; @@ -20214,6 +20241,66 @@ void cfg80211_schedule_channels_check(struct wireless_dev *wdev) } EXPORT_SYMBOL(cfg80211_schedule_channels_check); +int +cfg80211_update_link_reconfig_remove_update(struct net_device *netdev, + unsigned int link_id, + u8 tbtt_count, u64 tsf, + enum nl80211_commands cmd) +{ + struct wireless_dev *wdev = netdev->ieee80211_ptr; + struct wiphy *wiphy = wdev->wiphy; + struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); + struct sk_buff *msg; + void *hdr; + + /* Only for ML reconfigure link removal offloaded driver, need to + * update the status about the ongoing link removal to userspace. + */ + if (!wiphy_ext_feature_isset(wiphy, + NL80211_EXT_FEATURE_MLD_LINK_REMOVAL_OFFLOAD)) + return -EOPNOTSUPP; + + if (link_id >= 0 || !(wdev->valid_links & BIT(link_id))) + return -EINVAL; + + trace_cfg80211_update_link_reconfig_remove_update(wiphy, netdev, + link_id, tbtt_count, + tsf, cmd); + + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); + if (!msg) + return -ENOMEM; + + hdr = nl80211hdr_put(msg, 0, 0, 0, cmd); + + if (!hdr) + goto nla_put_failure; + + if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) || + nla_put_u32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex)) + goto nla_put_failure; + + if (nla_put_u8(msg, NL80211_ATTR_MLO_LINK_ID, link_id) || + nla_put_u8(msg, NL80211_ATTR_AP_REMOVAL_COUNT, tbtt_count) || + nla_put_u64_64bit(msg, NL80211_ATTR_TSF, tsf, + NL80211_ATTR_PAD)) + goto nla_put_failure; + + genlmsg_end(msg, hdr); + + genlmsg_multicast_netns(&nl80211_fam, wiphy_net(wiphy), msg, 0, + NL80211_MCGRP_MLME, GFP_ATOMIC); + + return 0; + + nla_put_failure: + genlmsg_cancel(msg, hdr); + nlmsg_free(msg); + + return -EINVAL; +} +EXPORT_SYMBOL(cfg80211_update_link_reconfig_remove_update); + /* initialisation/exit functions */ int __init nl80211_init(void) diff --git a/net/wireless/rdev-ops.h b/net/wireless/rdev-ops.h index 43897a5269b6..cbf5da73fbb0 100644 --- a/net/wireless/rdev-ops.h +++ b/net/wireless/rdev-ops.h @@ -1459,6 +1459,23 @@ rdev_del_intf_link(struct cfg80211_registered_device *rdev, trace_rdev_return_void(&rdev->wiphy); } +static inline int +rdev_link_reconfig_remove(struct cfg80211_registered_device *rdev, + struct net_device *dev, + const struct cfg80211_link_reconfig_removal_params *params) +{ + int ret = -EOPNOTSUPP; + + trace_rdev_link_reconfig_remove(&rdev->wiphy, dev, params); + + if (rdev->ops->link_reconfig_remove) + ret = rdev->ops->link_reconfig_remove(&rdev->wiphy, dev, + params); + + trace_rdev_return_int(&rdev->wiphy, ret); + return ret; +} + static inline int rdev_add_link_station(struct cfg80211_registered_device *rdev, struct net_device *dev, diff --git a/net/wireless/trace.h b/net/wireless/trace.h index e039e66ab377..383b07601275 100644 --- a/net/wireless/trace.h +++ b/net/wireless/trace.h @@ -4005,6 +4005,64 @@ TRACE_EVENT(rdev_set_ttlm, WIPHY_PR_ARG, NETDEV_PR_ARG) ); +TRACE_EVENT(rdev_link_reconfig_remove, + TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, + const struct cfg80211_link_reconfig_removal_params *params), + + TP_ARGS(wiphy, netdev, params), + + TP_STRUCT__entry( + WIPHY_ENTRY + NETDEV_ENTRY + __field(u32, link_id) + __field(u16, count) + __dynamic_array(u8, frame, params->elem_len) + ), + + TP_fast_assign( + WIPHY_ASSIGN; + NETDEV_ASSIGN; + __entry->link_id = params->link_id; + __entry->count = params->link_removal_cntdown; + memcpy(__get_dynamic_array(frame), params->reconfigure_elem, + params->elem_len); + ), + + TP_printk(WIPHY_PR_FMT ", " NETDEV_PR_FMT ", link_id: %u frame:0x%.2x count:%d", + WIPHY_PR_ARG, NETDEV_PR_ARG, __entry->link_id, + le16_to_cpup((__le16 *)__get_dynamic_array(frame)), __entry->count) +); + +TRACE_EVENT(cfg80211_update_link_reconfig_remove_update, + TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, + unsigned int link_id, u8 tbtt_count, u64 tsf, + enum nl80211_commands cmd), + + TP_ARGS(wiphy, netdev, link_id, tbtt_count, tsf, cmd), + + TP_STRUCT__entry( + WIPHY_ENTRY + NETDEV_ENTRY + __field(u32, link_id) + __field(u8, tbtt_count) + __field(u64, tsf) + __field(enum nl80211_commands, cmd) + ), + + TP_fast_assign( + WIPHY_ASSIGN; + NETDEV_ASSIGN; + __entry->link_id = link_id; + __entry->tbtt_count = tbtt_count; + __entry->tsf = tsf; + __entry->cmd = cmd; + ), + + TP_printk(WIPHY_PR_FMT ", " NETDEV_PR_FMT ", link_id: %u tbtt:%u tsf: %lld, cmd: %d", + WIPHY_PR_ARG, NETDEV_PR_ARG, + __entry->link_id, __entry->tbtt_count, __entry->tsf, __entry->cmd) +); + #endif /* !__RDEV_OPS_TRACE || TRACE_HEADER_MULTI_READ */ #undef TRACE_INCLUDE_PATH diff --git a/net/wireless/util.c b/net/wireless/util.c index 2bde8a354631..a7ba0d1850b5 100644 --- a/net/wireless/util.c +++ b/net/wireless/util.c @@ -2799,6 +2799,23 @@ bool cfg80211_iftype_allowed(struct wiphy *wiphy, enum nl80211_iftype iftype, } EXPORT_SYMBOL(cfg80211_iftype_allowed); +int cfg80211_link_reconfig_remove(struct wireless_dev *wdev, + const struct cfg80211_link_reconfig_removal_params *params) +{ + struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); + + lockdep_assert_wiphy(wdev->wiphy); + + /* Currently, removal of link from MLD is supported for AP BSS only, it + * can be extended for non-AP/STA MLD as well but that shall use + * action frame to update about its link reconfiguration. + */ + if (wdev->iftype == NL80211_IFTYPE_AP) + return rdev_link_reconfig_remove(rdev, wdev->netdev, params); + + return -EINVAL; +} + void cfg80211_remove_link(struct wireless_dev *wdev, unsigned int link_id) { struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 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Thu, 4 Apr 2024 19:00:14 GMT Received: from hu-mdharane-blr.qualcomm.com (10.80.80.8) by nasanex01a.na.qualcomm.com (10.52.223.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.4; Thu, 4 Apr 2024 12:00:13 -0700 From: Manish Dharanenthiran To: CC: , Manish Dharanenthiran Subject: [RFC v2 2/2] wifi: mac80211: Add support for link reconfigure removal Date: Fri, 5 Apr 2024 00:29:50 +0530 Message-ID: <20240404185950.776062-3-quic_mdharane@quicinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240404185950.776062-1-quic_mdharane@quicinc.com> References: <20240404185950.776062-1-quic_mdharane@quicinc.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nasanex01a.na.qualcomm.com (10.52.223.231) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: vo-Qra7mS29jzq8VJ4DAVK3sTnCicZlz X-Proofpoint-GUID: vo-Qra7mS29jzq8VJ4DAVK3sTnCicZlz X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-04-04_15,2024-04-04_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 bulkscore=0 mlxlogscore=999 spamscore=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 mlxscore=0 phishscore=0 impostorscore=0 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2404010003 definitions=main-2404040134 Add mac80211 routine to support sending link removal command to offloaded driver which accepts reconfigure Multi-Link element and the TBTT count for the link to be removed. To support this, introduce new mac80211 ops "link_reconfig_remove" to initiate link removal procedure in driver with Multi-Link reconfiguration element and TBTT count received from the userspace. Also, add mac80211 routine "ieee80211_update_link_reconfig_remove_status" which will be used by driver for sending TSF and current TBTT count receive from driver during the following scenarios, 1) When first beacon with Multi-Link reconfigure element is sent out in air, mac80211 will notify the userspace that link removal is started and it can proceed with further action like BTM etc., 2) When last beacon with Multi-Link reconfigure element (i.e. with link removal tbtt count as 0) is sent out in air, mac80211 will notify the userspace that link removal is completed. After which, userspace shall initiate the disassociation of the peer(s) connected and removal of the link completely. Signed-off-by: Manish Dharanenthiran --- include/net/mac80211.h | 25 +++++++++++++++++++++++++ net/mac80211/cfg.c | 12 ++++++++++++ net/mac80211/driver-ops.h | 19 +++++++++++++++++++ net/mac80211/ieee80211_i.h | 4 ++++ net/mac80211/link.c | 34 ++++++++++++++++++++++++++++++++++ net/mac80211/trace.h | 32 ++++++++++++++++++++++++++++++++ 6 files changed, 126 insertions(+) diff --git a/include/net/mac80211.h b/include/net/mac80211.h index f57c29de3a91..c55204e3d736 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -4394,6 +4394,10 @@ struct ieee80211_prep_tx_info { * if the requested TID-To-Link mapping can be accepted or not. * If it's not accepted the driver may suggest a preferred mapping and * modify @ttlm parameter with the suggested TID-to-Link mapping. + * @link_reconfig_remove: Notifies the driver about the link to be + * scheduled for removal with ML reconfigure element built for that particular + * link along with the TBTT count until which the beacon with ML + * reconfigure element should be sent. */ struct ieee80211_ops { void (*tx)(struct ieee80211_hw *hw, @@ -4778,6 +4782,9 @@ struct ieee80211_ops { enum ieee80211_neg_ttlm_res (*can_neg_ttlm)(struct ieee80211_hw *hw, struct ieee80211_vif *vif, struct ieee80211_neg_ttlm *ttlm); + int (*link_reconfig_remove)(struct ieee80211_hw *hw, + struct ieee80211_vif *vif, + const struct cfg80211_link_reconfig_removal_params *params); }; /** @@ -7600,6 +7607,24 @@ void ieee80211_set_active_links_async(struct ieee80211_vif *vif, */ void ieee80211_send_teardown_neg_ttlm(struct ieee80211_vif *vif); +/* Defines for ML Reconfigure removal offload */ + +/** + * ieee80211_update_link_reconfig_remove_update - Inform userspace about + * the removal status of link which is scheduled for removal + * @vif: interface in which reconfig removal status is received. + * @link_id: Link which is undergoing removal + * @tbtt_count: Current tbtt_count to be updated. + * @tsf: Beacon's timestamp value + * @cmd: Inform started or completed action to userspace + * + * For description, check cfg80211_link_reconfig_remove_update + */ +int ieee80211_update_link_reconfig_remove_update(struct ieee80211_vif *vif, + unsigned int link_id, + u8 tbtt_count, u64 tsf, + enum nl80211_commands cmd); + /* for older drivers - let's not document these ... */ int ieee80211_emulate_add_chanctx(struct ieee80211_hw *hw, struct ieee80211_chanctx_conf *ctx); diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index f03452dc716d..3bb040c78e94 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -4923,6 +4923,17 @@ static void ieee80211_del_intf_link(struct wiphy *wiphy, ieee80211_vif_set_links(sdata, wdev->valid_links, 0); } +static int +ieee80211_link_reconfig_remove(struct wiphy *wiphy, + struct net_device *dev, + const struct cfg80211_link_reconfig_removal_params *params) +{ + struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); + struct ieee80211_local *local = wiphy_priv(wiphy); + + return __ieee80211_link_reconfig_remove(local, sdata, params); +} + static int sta_add_link_station(struct ieee80211_local *local, struct ieee80211_sub_if_data *sdata, struct link_station_parameters *params) @@ -5166,4 +5177,5 @@ const struct cfg80211_ops mac80211_config_ops = { .del_link_station = ieee80211_del_link_station, .set_hw_timestamp = ieee80211_set_hw_timestamp, .set_ttlm = ieee80211_set_ttlm, + .link_reconfig_remove = ieee80211_link_reconfig_remove, }; diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h index 5d078c0a2323..4e4ffad9e7a7 100644 --- a/net/mac80211/driver-ops.h +++ b/net/mac80211/driver-ops.h @@ -1716,4 +1716,23 @@ drv_can_neg_ttlm(struct ieee80211_local *local, return res; } + +static inline int +drv_link_reconfig_remove(struct ieee80211_local *local, + struct ieee80211_sub_if_data *sdata, + const struct cfg80211_link_reconfig_removal_params *params) +{ + int ret = -EOPNOTSUPP; + + trace_drv_link_reconfig_remove(local, sdata, params); + + if (local->ops->link_reconfig_remove) + ret = local->ops->link_reconfig_remove(&local->hw, + &sdata->vif, + params); + trace_drv_return_int(local, ret); + + return ret; +} + #endif /* __MAC80211_DRIVER_OPS */ diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index def611e4e55f..3cafb7d52276 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -2041,6 +2041,10 @@ static inline void ieee80211_vif_clear_links(struct ieee80211_sub_if_data *sdata ieee80211_vif_set_links(sdata, 0, 0); } +int __ieee80211_link_reconfig_remove(struct ieee80211_local *local, + struct ieee80211_sub_if_data *sdata, + const struct cfg80211_link_reconfig_removal_params *params); + /* tx handling */ void ieee80211_clear_tx_pending(struct ieee80211_local *local); void ieee80211_tx_pending(struct tasklet_struct *t); diff --git a/net/mac80211/link.c b/net/mac80211/link.c index 43f9672fc7f1..081072624913 100644 --- a/net/mac80211/link.c +++ b/net/mac80211/link.c @@ -501,3 +501,37 @@ void ieee80211_set_active_links_async(struct ieee80211_vif *vif, wiphy_work_queue(sdata->local->hw.wiphy, &sdata->activate_links_work); } EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async); + +int __ieee80211_link_reconfig_remove(struct ieee80211_local *local, + struct ieee80211_sub_if_data *sdata, + const struct cfg80211_link_reconfig_removal_params *params) +{ + struct ieee80211_link_data *link; + + if (!ieee80211_sdata_running(sdata)) + return -ENETDOWN; + + if (sdata->vif.type != NL80211_IFTYPE_AP) + return -EINVAL; + + link = sdata_dereference(sdata->link[params->link_id], sdata); + if (!link) + return -ENOLINK; + + return drv_link_reconfig_remove(local, sdata, params); +} + +int ieee80211_update_link_reconfig_remove_update(struct ieee80211_vif *vif, + unsigned int link_id, + u8 tbtt_count, u64 tsf, + enum nl80211_commands cmd) +{ + struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); + + if (vif->type == NL80211_IFTYPE_AP) + return cfg80211_update_link_reconfig_remove_update(sdata->dev, link_id, + tbtt_count, tsf, + cmd); + return -EINVAL; +} +EXPORT_SYMBOL(ieee80211_update_link_reconfig_remove_update); diff --git a/net/mac80211/trace.h b/net/mac80211/trace.h index 8e758b5074bd..4d94ed0f6638 100644 --- a/net/mac80211/trace.h +++ b/net/mac80211/trace.h @@ -3145,6 +3145,38 @@ TRACE_EVENT(drv_neg_ttlm_res, LOCAL_PR_ARG, VIF_PR_ARG, __entry->res ) ); + +TRACE_EVENT(drv_link_reconfig_remove, + TP_PROTO(struct ieee80211_local *local, + struct ieee80211_sub_if_data *sdata, + const struct cfg80211_link_reconfig_removal_params *params), + + TP_ARGS(local, sdata, params), + + TP_STRUCT__entry( + LOCAL_ENTRY + VIF_ENTRY + __field(u32, link_id) + __field(u16, count) + __dynamic_array(u8, frame, params->elem_len) + ), + + TP_fast_assign( + LOCAL_ASSIGN; + VIF_ASSIGN; + __entry->link_id = params->link_id; + memcpy(__get_dynamic_array(frame), params->reconfigure_elem, + params->elem_len); + __entry->count = params->link_removal_cntdown; + ), + + TP_printk( + LOCAL_PR_FMT ", " VIF_PR_FMT ", link_id :%u frame:0x%.2x count:%d", + LOCAL_PR_ARG, VIF_PR_ARG, + __entry->link_id, le16_to_cpup((__le16 *)__get_dynamic_array(frame)), + __entry->count) +); + #endif /* !__MAC80211_DRIVER_TRACE || TRACE_HEADER_MULTI_READ */ #undef TRACE_INCLUDE_PATH