From patchwork Mon Oct 3 09:32:03 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Felix Fietkau X-Patchwork-Id: 12997401 X-Patchwork-Delegate: nbd@nbd.name 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 D4CA2C433FE for ; Mon, 3 Oct 2022 09:46:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231214AbiJCJqS (ORCPT ); Mon, 3 Oct 2022 05:46:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230093AbiJCJpz (ORCPT ); Mon, 3 Oct 2022 05:45:55 -0400 Received: from nbd.name (nbd.name [46.4.11.11]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0E45D5208C for ; Mon, 3 Oct 2022 02:42:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=nbd.name; s=20160729; h=Content-Transfer-Encoding:MIME-Version:Message-Id:Date:Subject: Cc:To:From:Sender:Reply-To:Content-Type:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: In-Reply-To:References:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=CT+N0HRKZuO2n/t0F7xayK9+lB29LjF6g9ytY2Bn2Bc=; b=MQY90g0Y7INvU/gDH1BziGCIOy RSV2eEC+uG4ocE90ZDY0L0b5sF+aFNxsNKvFWCUn62sUUvoFLMcFWlQQRbiYUrB3M+e32hNvnYyqf aC+w9fEj2Vxx5ivXb6ytQrhzxXEN686IDRj50hjdToX6r7aFy5CTtrG9MGw3oYWjkChA=; Received: from p200300daa7301d00d4086823c46c59c0.dip0.t-ipconnect.de ([2003:da:a730:1d00:d408:6823:c46c:59c0] helo=Maecks.lan) by ds12 with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 (Exim 4.94.2) (envelope-from ) id 1ofHny-009qu9-WE; Mon, 03 Oct 2022 11:32:07 +0200 From: Felix Fietkau To: linux-wireless@vger.kernel.org Cc: Ben Greear , Carson Vandegriffe Subject: [PATCH 1/4] Revert "mt76: use IEEE80211_OFFLOAD_ENCAP_ENABLED instead of MT_DRV_AMSDU_OFFLOAD" Date: Mon, 3 Oct 2022 11:32:03 +0200 Message-Id: <20221003093206.86323-1-nbd@nbd.name> X-Mailer: git-send-email 2.36.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Ben Greear This reverts commit f17f4864504d754bcbf31e4c89412cdf9946c409 and adds the MT_DRV_AMSDU_OFFLOAD flag for MT7921 USB/SDIO The reverted commit significantly decreases performance when running a test where two MT7915 radios have 16 station vdevs each, configured for AC mode, and transmitting UDP traffic to AP. Co-developed-by: Felix Fietkau Reported-by: Carson Vandegriffe Signed-off-by: Ben Greear Signed-off-by: Felix Fietkau --- drivers/net/wireless/mediatek/mt76/mac80211.c | 8 ++++++-- drivers/net/wireless/mediatek/mt76/mt76.h | 1 + drivers/net/wireless/mediatek/mt76/mt7915/mmio.c | 3 ++- drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 3 ++- drivers/net/wireless/mediatek/mt76/mt7921/sdio.c | 1 + drivers/net/wireless/mediatek/mt76/mt7921/usb.c | 3 ++- 6 files changed, 14 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mac80211.c b/drivers/net/wireless/mediatek/mt76/mac80211.c index 6de13d641438..4bdbfd0f6233 100644 --- a/drivers/net/wireless/mediatek/mt76/mac80211.c +++ b/drivers/net/wireless/mediatek/mt76/mac80211.c @@ -443,8 +443,12 @@ mt76_phy_init(struct mt76_phy *phy, struct ieee80211_hw *hw) ieee80211_hw_set(hw, SUPPORTS_CLONED_SKBS); ieee80211_hw_set(hw, SUPPORTS_AMSDU_IN_AMPDU); ieee80211_hw_set(hw, SUPPORTS_REORDERING_BUFFER); - ieee80211_hw_set(hw, TX_AMSDU); - ieee80211_hw_set(hw, TX_FRAG_LIST); + + if (!(dev->drv->drv_flags & MT_DRV_AMSDU_OFFLOAD)) { + ieee80211_hw_set(hw, TX_AMSDU); + ieee80211_hw_set(hw, TX_FRAG_LIST); + } + ieee80211_hw_set(hw, MFP_CAPABLE); ieee80211_hw_set(hw, AP_LINK_PS); ieee80211_hw_set(hw, REPORTS_TX_ACK_STATUS); diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h index 26febc0c261a..f9bdf16fc6c4 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76.h +++ b/drivers/net/wireless/mediatek/mt76/mt76.h @@ -415,6 +415,7 @@ struct mt76_hw_cap { #define MT_DRV_SW_RX_AIRTIME BIT(2) #define MT_DRV_RX_DMA_HDR BIT(3) #define MT_DRV_HW_MGMT_TXQ BIT(4) +#define MT_DRV_AMSDU_OFFLOAD BIT(5) struct mt76_driver_ops { u32 drv_flags; diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c b/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c index 2ffb509cad5c..be1b8ea711c7 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c @@ -781,7 +781,8 @@ struct mt7915_dev *mt7915_mmio_probe(struct device *pdev, static const struct mt76_driver_ops drv_ops = { /* txwi_size = txd size + txp size */ .txwi_size = MT_TXD_SIZE + sizeof(struct mt76_connac_fw_txp), - .drv_flags = MT_DRV_TXWI_NO_FREE | MT_DRV_HW_MGMT_TXQ, + .drv_flags = MT_DRV_TXWI_NO_FREE | MT_DRV_HW_MGMT_TXQ | + MT_DRV_AMSDU_OFFLOAD, .survey_flags = SURVEY_INFO_TIME_TX | SURVEY_INFO_TIME_RX | SURVEY_INFO_TIME_BSS_RX, diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c index 8a53d8f286db..b38d119b2ea9 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c @@ -228,7 +228,8 @@ static int mt7921_pci_probe(struct pci_dev *pdev, static const struct mt76_driver_ops drv_ops = { /* txwi_size = txd size + txp size */ .txwi_size = MT_TXD_SIZE + sizeof(struct mt76_connac_hw_txp), - .drv_flags = MT_DRV_TXWI_NO_FREE | MT_DRV_HW_MGMT_TXQ, + .drv_flags = MT_DRV_TXWI_NO_FREE | MT_DRV_HW_MGMT_TXQ | + MT_DRV_AMSDU_OFFLOAD, .survey_flags = SURVEY_INFO_TIME_TX | SURVEY_INFO_TIME_RX | SURVEY_INFO_TIME_BSS_RX, diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c b/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c index 3b25a06fd946..377ca5fa3f6e 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c @@ -89,6 +89,7 @@ static int mt7921s_probe(struct sdio_func *func, { static const struct mt76_driver_ops drv_ops = { .txwi_size = MT_SDIO_TXD_SIZE, + .drv_flags = MT_DRV_AMSDU_OFFLOAD, .survey_flags = SURVEY_INFO_TIME_TX | SURVEY_INFO_TIME_RX | SURVEY_INFO_TIME_BSS_RX, diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/usb.c b/drivers/net/wireless/mediatek/mt76/mt7921/usb.c index 29c0ee330dbe..89249f0b6aba 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/usb.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/usb.c @@ -170,7 +170,8 @@ static int mt7921u_probe(struct usb_interface *usb_intf, { static const struct mt76_driver_ops drv_ops = { .txwi_size = MT_SDIO_TXD_SIZE, - .drv_flags = MT_DRV_RX_DMA_HDR | MT_DRV_HW_MGMT_TXQ, + .drv_flags = MT_DRV_RX_DMA_HDR | MT_DRV_HW_MGMT_TXQ | + MT_DRV_AMSDU_OFFLOAD, .survey_flags = SURVEY_INFO_TIME_TX | SURVEY_INFO_TIME_RX | SURVEY_INFO_TIME_BSS_RX, From patchwork Mon Oct 3 09:32:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Felix Fietkau X-Patchwork-Id: 12997400 X-Patchwork-Delegate: nbd@nbd.name 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 82394C433F5 for ; Mon, 3 Oct 2022 09:46:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229956AbiJCJqR (ORCPT ); Mon, 3 Oct 2022 05:46:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49028 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229953AbiJCJpz (ORCPT ); Mon, 3 Oct 2022 05:45:55 -0400 Received: from nbd.name (nbd.name [46.4.11.11]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D19BE52820 for ; Mon, 3 Oct 2022 02:43:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; 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This is needed to support scatter/gather for packets on WLAN devices with A-MSDU offload Signed-off-by: Felix Fietkau --- drivers/net/wireless/mediatek/mt76/dma.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/dma.c b/drivers/net/wireless/mediatek/mt76/dma.c index 4901aa02b4fb..ceb63b3aaced 100644 --- a/drivers/net/wireless/mediatek/mt76/dma.c +++ b/drivers/net/wireless/mediatek/mt76/dma.c @@ -359,12 +359,17 @@ mt76_dma_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q, .skb = skb, }; struct ieee80211_hw *hw; - int len, n = 0, ret = -ENOMEM; + int len, i, n = 0, ret = -ENOMEM; struct mt76_txwi_cache *t; struct sk_buff *iter; dma_addr_t addr; u8 *txwi; + if (skb_shinfo(skb)->nr_frags && + skb_shinfo(skb)->nr_frags + 1 > dev->hw->max_tx_fragments && + skb_linearize(skb)) + goto free_skb; + t = mt76_get_txwi(dev); if (!t) goto free_skb; @@ -385,6 +390,22 @@ mt76_dma_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q, tx_info.buf[n].addr = addr; tx_info.buf[n++].len = len; + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { + skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; + + if (n == ARRAY_SIZE(tx_info.buf)) + goto unmap; + + len = skb_frag_size(frag); + addr = skb_frag_dma_map(dev->dma_dev, frag, 0, len, + DMA_TO_DEVICE); + if (unlikely(dma_mapping_error(dev->dma_dev, addr))) + goto unmap; + + tx_info.buf[n].addr = addr; + tx_info.buf[n++].len = len; + } + skb_walk_frags(skb, iter) { if (n == ARRAY_SIZE(tx_info.buf)) goto unmap; From patchwork Mon Oct 3 09:32:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Felix Fietkau X-Patchwork-Id: 12997397 X-Patchwork-Delegate: nbd@nbd.name 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 E9FFEC433FE for ; Mon, 3 Oct 2022 09:38:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230260AbiJCJie (ORCPT ); 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Received: from p200300daa7301d00d4086823c46c59c0.dip0.t-ipconnect.de ([2003:da:a730:1d00:d408:6823:c46c:59c0] helo=Maecks.lan) by ds12 with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 (Exim 4.94.2) (envelope-from ) id 1ofHnz-009qu9-Bz for linux-wireless@vger.kernel.org; Mon, 03 Oct 2022 11:32:07 +0200 From: Felix Fietkau To: linux-wireless@vger.kernel.org Subject: [PATCH 3/4] wifi: mt76: add tx checksum offload for mt7915 and mt7921 Date: Mon, 3 Oct 2022 11:32:05 +0200 Message-Id: <20221003093206.86323-3-nbd@nbd.name> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20221003093206.86323-1-nbd@nbd.name> References: <20221003093206.86323-1-nbd@nbd.name> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Supports IPv4 and IPv6 TCP + UDP Signed-off-by: Felix Fietkau --- drivers/net/wireless/mediatek/mt76/mt76_connac_mac.c | 5 +++++ drivers/net/wireless/mediatek/mt76/mt7915/init.c | 3 ++- drivers/net/wireless/mediatek/mt76/mt7921/init.c | 3 ++- 3 files changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mac.c b/drivers/net/wireless/mediatek/mt76/mt76_connac_mac.c index 8b7ec64abc95..562d01ec65c9 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mac.c @@ -337,6 +337,9 @@ mt76_connac2_mac_write_txwi_8023(__le32 *txwi, struct sk_buff *skb, wmm = sta->wme; } + val = FIELD_PREP(MT_TXD0_ETH_TYPE_OFFSET, 10); + txwi[0] |= cpu_to_le32(val); + val = FIELD_PREP(MT_TXD1_HDR_FORMAT, MT_HDR_FORMAT_802_3) | FIELD_PREP(MT_TXD1_TID, tid); @@ -356,6 +359,8 @@ mt76_connac2_mac_write_txwi_8023(__le32 *txwi, struct sk_buff *skb, val = FIELD_PREP(MT_TXD7_TYPE, fc_type) | FIELD_PREP(MT_TXD7_SUB_TYPE, fc_stype); + if (skb->ip_summed == CHECKSUM_PARTIAL) + val |= MT_TXD7_IP_SUM | MT_TXD7_UDP_TCP_SUM; txwi[7] |= cpu_to_le32(val); } diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net/wireless/mediatek/mt76/mt7915/init.c index 324db5291c85..d3011965451d 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c @@ -329,7 +329,8 @@ mt7915_init_wiphy(struct ieee80211_hw *hw) hw->queues = 4; hw->max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HE; hw->max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HE; - hw->netdev_features = NETIF_F_RXCSUM; + hw->netdev_features = NETIF_F_RXCSUM | + NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; hw->radiotap_timestamp.units_pos = IEEE80211_RADIOTAP_TIMESTAMP_UNIT_US; diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/init.c b/drivers/net/wireless/mediatek/mt76/mt7921/init.c index dcdb3cf04ac1..b607f0a51c68 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/init.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/init.c @@ -55,7 +55,8 @@ mt7921_init_wiphy(struct ieee80211_hw *hw) hw->queues = 4; hw->max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HE; hw->max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HE; - hw->netdev_features = NETIF_F_RXCSUM; + hw->netdev_features = NETIF_F_RXCSUM | + NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; hw->radiotap_timestamp.units_pos = IEEE80211_RADIOTAP_TIMESTAMP_UNIT_US; From patchwork Mon Oct 3 09:32:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Felix Fietkau X-Patchwork-Id: 12997402 X-Patchwork-Delegate: nbd@nbd.name 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 048ACC433F5 for ; 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Received: from p200300daa7301d00d4086823c46c59c0.dip0.t-ipconnect.de ([2003:da:a730:1d00:d408:6823:c46c:59c0] helo=Maecks.lan) by ds12 with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 (Exim 4.94.2) (envelope-from ) id 1ofHnz-009qu9-Hn for linux-wireless@vger.kernel.org; Mon, 03 Oct 2022 11:32:07 +0200 From: Felix Fietkau To: linux-wireless@vger.kernel.org Subject: [PATCH 4/4] wifi: mt76: declare netdev support for scatter/gather on 7915e and 7921e Date: Mon, 3 Oct 2022 11:32:06 +0200 Message-Id: <20221003093206.86323-4-nbd@nbd.name> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20221003093206.86323-1-nbd@nbd.name> References: <20221003093206.86323-1-nbd@nbd.name> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org This helps with locally generated TCP traffic to avoid unnecessary data copying. Also bump the maximum number of fragments to the limit imposed by the firmware txp struct. Signed-off-by: Felix Fietkau --- drivers/net/wireless/mediatek/mt76/mt7915/init.c | 5 +++-- drivers/net/wireless/mediatek/mt76/mt7921/init.c | 4 +++- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net/wireless/mediatek/mt76/mt7915/init.c index d3011965451d..ff49d3837b9e 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c @@ -330,7 +330,8 @@ mt7915_init_wiphy(struct ieee80211_hw *hw) hw->max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HE; hw->max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HE; hw->netdev_features = NETIF_F_RXCSUM | - NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; + NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | + NETIF_F_SG; hw->radiotap_timestamp.units_pos = IEEE80211_RADIOTAP_TIMESTAMP_UNIT_US; @@ -368,7 +369,7 @@ mt7915_init_wiphy(struct ieee80211_hw *hw) ieee80211_hw_set(hw, WANT_MONITOR_VIF); ieee80211_hw_set(hw, SUPPORTS_VHT_EXT_NSS_BW); - hw->max_tx_fragments = 4; + hw->max_tx_fragments = 6; if (phy->mt76->cap.has_2ghz) { phy->mt76->sband_2g.sband.ht_cap.cap |= diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/init.c b/drivers/net/wireless/mediatek/mt76/mt7921/init.c index b607f0a51c68..9543584abfb5 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/init.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/init.c @@ -57,6 +57,8 @@ mt7921_init_wiphy(struct ieee80211_hw *hw) hw->max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HE; hw->netdev_features = NETIF_F_RXCSUM | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; + if (mt76_is_mmio(&dev->mt76)) + hw->netdev_features |= NETIF_F_SG; hw->radiotap_timestamp.units_pos = IEEE80211_RADIOTAP_TIMESTAMP_UNIT_US; @@ -104,7 +106,7 @@ mt7921_init_wiphy(struct ieee80211_hw *hw) if (dev->pm.enable) ieee80211_hw_set(hw, CONNECTION_MONITOR); - hw->max_tx_fragments = 4; + hw->max_tx_fragments = 6; return 0; }