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(p200300ea8f1fad00510ae145c42275a7.dip0.t-ipconnect.de. [2003:ea:8f1f:ad00:510a:e145:c422:75a7]) by smtp.googlemail.com with ESMTPSA id r15sm6436452wrj.61.2021.01.26.01.03.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 26 Jan 2021 01:03:06 -0800 (PST) From: Heiner Kallweit Subject: [PATCH net] r8169: work around RTL8125 UDP hw bug To: Jakub Kicinski , David Miller , Realtek linux nic maintainers Cc: "netdev@vger.kernel.org" , xplo.bn@gmail.com Message-ID: Date: Tue, 26 Jan 2021 10:02:56 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org It was reported that on RTL8125 network breaks under heavy UDP load, e.g. torrent traffic ([0], from comment 27). Realtek confirmed a hw bug and provided me with a test version of the r8125 driver including a workaround. Tests confirmed that the workaround fixes the issue. I modified the original version of the workaround to meet mainline code style. [0] https://bugzilla.kernel.org/show_bug.cgi?id=209839 Fixes: f1bce4ad2f1c ("r8169: add support for RTL8125") Tested-by: xplo Signed-off-by: Heiner Kallweit --- drivers/net/ethernet/realtek/r8169_main.c | 64 ++++++++++++++++++++--- 1 file changed, 58 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c index fb67d8f79..90052033b 100644 --- a/drivers/net/ethernet/realtek/r8169_main.c +++ b/drivers/net/ethernet/realtek/r8169_main.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include @@ -4007,17 +4008,64 @@ static int rtl8169_xmit_frags(struct rtl8169_private *tp, struct sk_buff *skb, return -EIO; } -static bool rtl_test_hw_pad_bug(struct rtl8169_private *tp) +static bool rtl_skb_is_udp(struct sk_buff *skb) { + switch (vlan_get_protocol(skb)) { + case htons(ETH_P_IP): + return ip_hdr(skb)->protocol == IPPROTO_UDP; + case htons(ETH_P_IPV6): + return ipv6_hdr(skb)->nexthdr == IPPROTO_UDP; + default: + return false; + } +} + +#define RTL_MIN_PATCH_LEN 47 +#define PTP_GEN_PORT 320 + +/* see rtl8125_get_patch_pad_len() in r8125 vendor driver */ +static unsigned int rtl8125_quirk_udp_padto(struct rtl8169_private *tp, + struct sk_buff *skb) +{ + unsigned int padto = 0, len = skb->len; + + if (rtl_is_8125(tp) && len < 175 && rtl_skb_is_udp(skb) && + skb_transport_header_was_set(skb)) { + unsigned int trans_data_len = skb_tail_pointer(skb) - + skb_transport_header(skb); + + if (trans_data_len > 3 && trans_data_len < RTL_MIN_PATCH_LEN) { + u16 dest = ntohs(udp_hdr(skb)->dest); + + if (dest == PTP_EV_PORT || dest == PTP_GEN_PORT) + padto = len + RTL_MIN_PATCH_LEN - trans_data_len; + } + + if (trans_data_len < UDP_HLEN) + padto = max(padto, len + UDP_HLEN - trans_data_len); + } + + return padto; +} + +static unsigned int rtl_quirk_packet_padto(struct rtl8169_private *tp, + struct sk_buff *skb) +{ + unsigned int padto; + + padto = rtl8125_quirk_udp_padto(tp, skb); + switch (tp->mac_version) { case RTL_GIGA_MAC_VER_34: case RTL_GIGA_MAC_VER_60: case RTL_GIGA_MAC_VER_61: case RTL_GIGA_MAC_VER_63: - return true; + padto = max_t(unsigned int, padto, ETH_ZLEN); default: - return false; + break; } + + return padto; } static void rtl8169_tso_csum_v1(struct sk_buff *skb, u32 *opts) @@ -4089,9 +4137,10 @@ static bool rtl8169_tso_csum_v2(struct rtl8169_private *tp, opts[1] |= transport_offset << TCPHO_SHIFT; } else { - if (unlikely(skb->len < ETH_ZLEN && rtl_test_hw_pad_bug(tp))) - /* eth_skb_pad would free the skb on error */ - return !__skb_put_padto(skb, ETH_ZLEN, false); + unsigned int padto = rtl_quirk_packet_padto(tp, skb); + + /* skb_padto would free the skb on error */ + return !__skb_put_padto(skb, padto, false); } return true; @@ -4268,6 +4317,9 @@ static netdev_features_t rtl8169_features_check(struct sk_buff *skb, if (skb->len < ETH_ZLEN) features &= ~NETIF_F_CSUM_MASK; + if (rtl_quirk_packet_padto(tp, skb)) + features &= ~NETIF_F_CSUM_MASK; + if (transport_offset > TCPHO_MAX && rtl_chip_supports_csum_v2(tp)) features &= ~NETIF_F_CSUM_MASK; -- 2.30.0