NL80211_CMD_FRAME is used to send frames from userspace. Add support to transmit the frames at a rate specified by userspace when needed. The drivers shall indicate the support to send frames at rate specified by userspace by setting %NL80211_EXT_FEATURE_CMD_FRAME_TXRATE flag in wiphy capabilities. The userspace can specify the rate within %NL80211_ATTR_RATE_INFO attribute while sending %NL80211_CMD_FRAME.
NL80211_ATTR_RATE_INFO is a nested attribute and encapsulates the attributes defined in &enum nl80211_rate_info. Signed-off-by: vamsi krishna <[email protected]> diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index c032375..dbf58c6 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -2629,6 +2629,11 @@ struct cfg80211_update_ft_ies_params { * @dont_wait_for_ack: tells the low level not to wait for an ack * @n_csa_offsets: length of csa_offsets array * @csa_offsets: array of all the csa offsets in the frame + * @txrate: Tx rate at which this frame shall be transmitted on-air. + * txrate->legacy shall be used to determine 11abg rate only when none of + * RATE_INFO_FLAGS_MCS, RATE_INFO_FLAGS_VHT_MCS and RATE_INFO_FLAGS_HE_MCS + * flags in txrate->flags. + * @txrate_specified: Indicates whether any valid tx rate specified @txrate. */ struct cfg80211_mgmt_tx_params { struct ieee80211_channel *chan; @@ -2640,6 +2645,8 @@ struct cfg80211_mgmt_tx_params { bool dont_wait_for_ack; int n_csa_offsets; const u16 *csa_offsets; + struct rate_info txrate; + bool txrate_specified; }; /** diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h index 0d4dd14..b731868 100644 --- a/include/uapi/linux/nl80211.h +++ b/include/uapi/linux/nl80211.h @@ -646,6 +646,11 @@ * %NL80211_ATTR_CSA_C_OFFSETS_TX is an array of offsets to CSA * counters which will be updated to the current value. This attribute * is used during CSA period. + * Optionally the rate at which this frame shall be transmitted can be + * specified using %NL80211_ATTR_RATE_INFO if the driver indicates the + * support by setting %NL80211_EXT_FEATURE_CMD_FRAME_TXRATE feature flag. + * NL80211_RATE_INFO_BITRATE* shall not be populated within + * %NL80211_ATTR_RATE_INFO unless one of the 11abg rates is specified. * @NL80211_CMD_FRAME_WAIT_CANCEL: When an off-channel TX was requested, this * command may be used with the corresponding cookie to cancel the wait * time if it is known that it is no longer necessary. @@ -2270,6 +2275,12 @@ enum nl80211_commands { * or bssid attribute will have higher precedence than the thresholds * mentioned in this attribute while checking rssi. * + * @NL80211_ATTR_RATE_INFO: Specifies either tx rate at which a packet shall be + * transmitted or rx rate at which a packet has been received. Nested + * attribute containing info as possible, see &enum nl80211_rate_info. + * Will be used with %NL80211_CMD_FRAME to specify the phy rate at which + * the frame associated with this command shall be transmitted over the + * air. * @NUM_NL80211_ATTR: total number of nl80211_attrs available * @NL80211_ATTR_MAX: highest attribute number currently defined * @__NL80211_ATTR_AFTER_LAST: internal use @@ -2717,6 +2728,8 @@ enum nl80211_attrs { NL80211_ATTR_SCHED_SCAN_MIN_RSSI, + NL80211_ATTR_RATE_INFO, + /* add attributes here, update the policy in nl80211.c */ __NL80211_ATTR_AFTER_LAST, @@ -2930,7 +2943,9 @@ enum nl80211_he_ru_alloc { * enum nl80211_rate_info - bitrate information * * These attribute types are used with %NL80211_STA_INFO_TXRATE - * when getting information about the bitrate of a station. + * when getting information about the bitrate of a station and with + * %NL80211_CMD_FRAME to specify the phy rate at which the frame shall + * be transmitted. * There are 2 attributes for bitrate, a legacy one that represents * a 16-bit value, and new one that represents a 32-bit value. * If the rate value fits into 16 bit, both attributes are reported @@ -5278,6 +5293,10 @@ enum nl80211_feature_flags { * @NL80211_EXT_FEATURE_SCHED_SCAN_BAND_SPECIFIC_RSSI_THOLD: The driver supports * filtering scan results with band specific rssi thresholds that are * specified within %NL80211_ATTR_SCHED_SCAN_MIN_RSSI. + * @NL80211_EXT_FEATURE_CMD_FRAME_TXRATE: The driver supports sending frames + * at rate specified by userspace with %NL80211_CMD_FRAME. The tx rate + * shall be specified within %NL80211_ATTR_RATE_INFO nested attribute + * with %NL80211_CMD_FRAME command. * * @NUM_NL80211_EXT_FEATURES: number of extended features. * @MAX_NL80211_EXT_FEATURES: highest extended feature index. @@ -5319,6 +5338,7 @@ enum nl80211_ext_feature_index { NL80211_EXT_FEATURE_CAN_REPLACE_PTK0, NL80211_EXT_FEATURE_ENABLE_FTM_RESPONDER, NL80211_EXT_FEATURE_SCHED_SCAN_BAND_SPECIFIC_RSSI_THOLD, + NL80211_EXT_FEATURE_CMD_FRAME_TXRATE, /* add new features before the definition below */ NUM_NL80211_EXT_FEATURES, diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 4fc0bfc..9bb7b65 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -498,6 +498,7 @@ static int validate_ie_attr(const struct nlattr *attr, .validation_data = nl80211_ftm_responder_policy, }, [NL80211_ATTR_SCHED_SCAN_MIN_RSSI] = { .type = NLA_NESTED }, + [NL80211_ATTR_RATE_INFO] = { .type = NLA_NESTED }, }; /* policy for the key attributes */ @@ -638,6 +639,27 @@ static int validate_ie_attr(const struct nlattr *attr, [NL80211_PKTPAT_OFFSET] = { .type = NLA_U32 }, }; +static const struct nla_policy +nl80211_rate_info_policy[NL80211_RATE_INFO_MAX + 1] = { + [NL80211_RATE_INFO_BITRATE] = { .type = NLA_U16 }, + [NL80211_RATE_INFO_MCS] = { .type = NLA_U8 }, + [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG }, + [NL80211_RATE_INFO_SHORT_GI] = { .type = NLA_FLAG }, + [NL80211_RATE_INFO_BITRATE32] = { .type = NLA_U32 }, + [NL80211_RATE_INFO_VHT_MCS] = { .type = NLA_U8 }, + [NL80211_RATE_INFO_VHT_NSS] = { .type = NLA_U8 }, + [NL80211_RATE_INFO_80_MHZ_WIDTH] = { .type = NLA_FLAG }, + [NL80211_RATE_INFO_80P80_MHZ_WIDTH] = { .type = NLA_FLAG }, + [NL80211_RATE_INFO_160_MHZ_WIDTH] = { .type = NLA_FLAG }, + [NL80211_RATE_INFO_10_MHZ_WIDTH] = { .type = NLA_FLAG }, + [NL80211_RATE_INFO_5_MHZ_WIDTH] = { .type = NLA_FLAG }, + [NL80211_RATE_INFO_HE_MCS] = { .type = NLA_U8 }, + [NL80211_RATE_INFO_HE_NSS] = { .type = NLA_U8 }, + [NL80211_RATE_INFO_HE_GI] = { .type = NLA_U8 }, + [NL80211_RATE_INFO_HE_DCM] = { .type = NLA_U8 }, + [NL80211_RATE_INFO_HE_RU_ALLOC] = { .type = NLA_U8 }, +}; + static int nl80211_prepare_wdev_dump(struct netlink_callback *cb, struct cfg80211_registered_device **rdev, struct wireless_dev **wdev) @@ -9918,6 +9940,92 @@ static int nl80211_register_mgmt(struct sk_buff *skb, struct genl_info *info) nla_len(info->attrs[NL80211_ATTR_FRAME_MATCH])); } +static int +nl80211_parse_rate_info(struct genl_info *info, struct rate_info *rate) +{ + struct nlattr *tb[NL80211_RATE_INFO_MAX + 1]; + struct nlattr *attr; + int err; + + attr = info->attrs[NL80211_ATTR_RATE_INFO]; + if (!attr) + return -EINVAL; + + err = nla_parse_nested(tb, NL80211_RATE_INFO_MAX, attr, + nl80211_rate_info_policy, NULL); + if (err) + return err; + + if (tb[NL80211_RATE_INFO_BITRATE] || tb[NL80211_RATE_INFO_BITRATE32]) { + if (tb[NL80211_RATE_INFO_MCS] || + tb[NL80211_RATE_INFO_VHT_MCS] || + tb[NL80211_RATE_INFO_HE_MCS]) + return -EINVAL; + } else if (tb[NL80211_RATE_INFO_MCS]) { + if (tb[NL80211_RATE_INFO_VHT_MCS] || + tb[NL80211_RATE_INFO_HE_MCS]) + return -EINVAL; + } else if (tb[NL80211_RATE_INFO_VHT_MCS]) { + if (tb[NL80211_RATE_INFO_HE_MCS]) + return -EINVAL; + if (!tb[NL80211_RATE_INFO_VHT_NSS]) + return -EINVAL; + } else if (tb[NL80211_RATE_INFO_HE_MCS]) { + if (!(tb[NL80211_RATE_INFO_HE_NSS] && + tb[NL80211_RATE_INFO_HE_GI] && + tb[NL80211_RATE_INFO_HE_DCM])) + return -EINVAL; + } else { + return -EINVAL; + } + + memset(rate, 0, sizeof(struct rate_info)); + + if (tb[NL80211_RATE_INFO_BITRATE32]) { + /* Safe to truncate, as 11abg rates will fit into 16-bits */ + rate->legacy = + (u16)nla_get_u32(tb[NL80211_RATE_INFO_BITRATE32]); + } else if (tb[NL80211_RATE_INFO_BITRATE]) { + rate->legacy = nla_get_u16(tb[NL80211_RATE_INFO_BITRATE]); + } else if (tb[NL80211_RATE_INFO_MCS]) { + rate->mcs = nla_get_u16(tb[NL80211_RATE_INFO_MCS]); + rate->flags |= RATE_INFO_FLAGS_MCS; + } else if (tb[NL80211_RATE_INFO_VHT_MCS]) { + rate->mcs = nla_get_u16(tb[NL80211_RATE_INFO_VHT_MCS]); + rate->nss = nla_get_u8(tb[NL80211_RATE_INFO_VHT_NSS]); + rate->flags |= RATE_INFO_FLAGS_VHT_MCS; + } else if (tb[NL80211_RATE_INFO_HE_MCS]) { + rate->mcs = nla_get_u16(tb[NL80211_RATE_INFO_HE_MCS]); + rate->nss = nla_get_u8(tb[NL80211_RATE_INFO_HE_NSS]); + rate->flags |= RATE_INFO_FLAGS_HE_MCS; + } + + if (tb[NL80211_RATE_INFO_MCS] || tb[NL80211_RATE_INFO_VHT_MCS]) { + if (nla_get_flag(tb[NL80211_RATE_INFO_SHORT_GI])) + rate->flags |= RATE_INFO_FLAGS_SHORT_GI; + } else if (tb[NL80211_RATE_INFO_HE_MCS]) { + rate->he_gi = nla_get_u8(tb[NL80211_RATE_INFO_HE_GI]); + rate->he_dcm = nla_get_u8(tb[NL80211_RATE_INFO_HE_DCM]); + } + + if (nla_get_flag(tb[NL80211_RATE_INFO_5_MHZ_WIDTH])) + rate->bw = RATE_INFO_BW_5; + else if (nla_get_flag(tb[NL80211_RATE_INFO_10_MHZ_WIDTH])) + rate->bw = RATE_INFO_BW_10; + else if (nla_get_flag(tb[NL80211_RATE_INFO_40_MHZ_WIDTH])) + rate->bw = RATE_INFO_BW_40; + else if (nla_get_flag(tb[NL80211_RATE_INFO_80_MHZ_WIDTH])) + rate->bw = RATE_INFO_BW_80; + else if (nla_get_flag(tb[NL80211_RATE_INFO_160_MHZ_WIDTH])) + rate->bw = RATE_INFO_BW_160; + else if (tb[NL80211_RATE_INFO_HE_MCS]) + rate->bw = RATE_INFO_BW_HE_RU; + else + rate->bw = RATE_INFO_BW_20; + + return 0; +} + static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info) { struct cfg80211_registered_device *rdev = info->user_ptr[0]; @@ -9955,6 +10063,11 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info) return -EOPNOTSUPP; } + if (!wiphy_ext_feature_isset(&rdev->wiphy, + NL80211_EXT_FEATURE_CMD_FRAME_TXRATE) && + info->attrs[NL80211_ATTR_RATE_INFO]) + return -EINVAL; + if (info->attrs[NL80211_ATTR_DURATION]) { if (!(rdev->wiphy.flags & WIPHY_FLAG_OFFCHAN_TX)) return -EINVAL; @@ -10017,6 +10130,15 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info) } } + if (info->attrs[NL80211_ATTR_RATE_INFO]) { + err = nl80211_parse_rate_info(info, ¶ms.txrate); + if (err) + return err; + params.txrate_specified = true; + } else { + params.txrate_specified = false; + } + if (!params.dont_wait_for_ack) { msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); if (!msg) -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
