From: Birger Koblitz Date: Thu, 29 Apr 2021 20:53:59 +0000 (+0200) Subject: realtek: enable CRC offloading X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=9e8d62e42117bd05040618cb094565587e51a6f4;p=openwrt%2Fstaging%2Faparcar.git realtek: enable CRC offloading Enables CRC calculation offloading on RTL8380/8390/9300. Tested on Zyxel XGS1210-10 (RTL9302)/GS1900-48 (RTL8390)/GS1900-10HP (RTL8382) On the Zyxel GS1900-10HP, an increase of 5% in iperf3 send throughput and 11% in receive throughput is seen. Signed-off-by: Birger Koblitz --- diff --git a/target/linux/realtek/files-5.4/drivers/net/ethernet/rtl838x_eth.c b/target/linux/realtek/files-5.4/drivers/net/ethernet/rtl838x_eth.c index 2f678b7384..38b2901652 100644 --- a/target/linux/realtek/files-5.4/drivers/net/ethernet/rtl838x_eth.c +++ b/target/linux/realtek/files-5.4/drivers/net/ethernet/rtl838x_eth.c @@ -234,19 +234,21 @@ struct dsa_tag { u16 port; u8 l2_offloaded; u8 prio; + bool crc_error; }; bool rtl838x_decode_tag(struct p_hdr *h, struct dsa_tag *t) { t->reason = h->cpu_tag[3] & 0xf; - if (t->reason != 15) - pr_debug("Reason: %d\n", t->reason); t->queue = (h->cpu_tag[0] & 0xe0) >> 5; + t->port = h->cpu_tag[1] & 0x1f; + t->crc_error = t->reason == 13; + + pr_debug("Reason: %d\n", t->reason); if (t->reason != 4) // NIC_RX_REASON_SPECIAL_TRAP t->l2_offloaded = 1; else t->l2_offloaded = 0; - t->port = h->cpu_tag[1] & 0x1f; return t->l2_offloaded; } @@ -254,37 +256,48 @@ bool rtl838x_decode_tag(struct p_hdr *h, struct dsa_tag *t) bool rtl839x_decode_tag(struct p_hdr *h, struct dsa_tag *t) { t->reason = h->cpu_tag[4] & 0x1f; - if (t->reason != 31) + t->queue = (h->cpu_tag[3] & 0xe000) >> 13; + t->port = h->cpu_tag[1] & 0x3f; + t->crc_error = h->cpu_tag[3] & BIT(2); + pr_debug("Reason: %d\n", t->reason); - t->queue = (h->cpu_tag[3] & 0xe000) >> 13; if ((t->reason != 7) && (t->reason != 8)) // NIC_RX_REASON_RMA_USR t->l2_offloaded = 1; else t->l2_offloaded = 0; - - t->port = h->cpu_tag[1] & 0x3f; return t->l2_offloaded; } -bool rtl931x_decode_tag(struct p_hdr *h, struct dsa_tag *t) +bool rtl930x_decode_tag(struct p_hdr *h, struct dsa_tag *t) { t->reason = h->cpu_tag[7] & 0x3f; - pr_debug("Reason %d\n", t->reason); t->queue = (h->cpu_tag[2] >> 11) & 0x1f; + t->port = (h->cpu_tag[0] >> 8) & 0x1f; + t->crc_error = h->cpu_tag[1] & BIT(6); + + pr_debug("Reason %d, port %d, queue %d\n", t->reason, t->port, t->queue); if (t->reason >= 19 && t->reason <= 27) t->l2_offloaded = 0; else t->l2_offloaded = 1; - t->port = (h->cpu_tag[0] >> 8) & 0x3f; return t->l2_offloaded; } -bool rtl930x_decode_tag(struct p_hdr *h, struct dsa_tag *t) +bool rtl931x_decode_tag(struct p_hdr *h, struct dsa_tag *t) { - rtl931x_decode_tag(h, t); - t->port &= 0x1f; + t->reason = h->cpu_tag[7] & 0x3f; + t->queue = (h->cpu_tag[2] >> 11) & 0x1f; + t->port = (h->cpu_tag[0] >> 8) & 0x3f; + t->crc_error = h->cpu_tag[1] & BIT(6); + + pr_debug("Reason %d, port %d, queue %d\n", t->reason, t->port, t->queue); + if (t->reason >= 19 && t->reason <= 27) + t->l2_offloaded = 0; + else + t->l2_offloaded = 1; + return t->l2_offloaded; } @@ -731,8 +744,9 @@ static void rtl838x_hw_en_rxtx(struct rtl838x_eth_priv *priv) * | MEDIA_SEL */ sw_w32(0x6192F, priv->r->mac_force_mode_ctrl + priv->cpu_port * 4); - /* allow CRC errors on CPU-port */ - sw_w32_mask(0, 0x8, priv->r->mac_port_ctrl(priv->cpu_port)); + + /* Enable CRC checks on CPU-port */ + sw_w32_mask(0, BIT(3), priv->r->mac_port_ctrl(priv->cpu_port)); } static void rtl839x_hw_en_rxtx(struct rtl838x_eth_priv *priv) @@ -746,8 +760,8 @@ static void rtl839x_hw_en_rxtx(struct rtl838x_eth_priv *priv) /* Enable DMA */ sw_w32_mask(0, RX_EN | TX_EN, priv->r->dma_if_ctrl); - /* Restart TX/RX to CPU port */ - sw_w32_mask(0x0, 0x3, priv->r->mac_port_ctrl(priv->cpu_port)); + /* Restart TX/RX to CPU port, enable CRC checking */ + sw_w32_mask(0x0, 0x3 | BIT(3), priv->r->mac_port_ctrl(priv->cpu_port)); /* CPU port joins Lookup Miss Flooding Portmask */ // TODO: The code below should also work for the RTL838x @@ -784,8 +798,8 @@ static void rtl93xx_hw_en_rxtx(struct rtl838x_eth_priv *priv) /* Enable DMA */ sw_w32_mask(0, RX_EN_93XX | TX_EN_93XX, priv->r->dma_if_ctrl); - /* Restart TX/RX to CPU port */ - sw_w32_mask(0x0, 0x3, priv->r->mac_port_ctrl(priv->cpu_port)); + /* Restart TX/RX to CPU port, enable CRC checking */ + sw_w32_mask(0x0, 0x3 | BIT(4), priv->r->mac_port_ctrl(priv->cpu_port)); sw_w32_mask(0, BIT(priv->cpu_port), RTL930X_L2_UNKN_UC_FLD_PMSK); sw_w32(0x217, priv->r->mac_force_mode_ctrl + priv->cpu_port * 4); @@ -1115,15 +1129,20 @@ static int rtl838x_eth_tx(struct sk_buff *skb, struct net_device *dev) if (netdev_uses_dsa(dev) && skb->data[len-4] == 0x80 && skb->data[len-3] > 0 && skb->data[len-3] < 28 && skb->data[len-2] == 0x10 && skb->data[len-1] == 0x00) { - /* Reuse tag space for CRC */ + /* Reuse tag space for CRC if possible */ dest_port = skb->data[len-3]; len -= 4; } - if (len < ETH_ZLEN) - len = ETH_ZLEN; - /* ASIC expects that packet includes CRC, so we extend by 4 bytes */ - len += 4; + len += 4; // Add space for CRC + + // On RTL8380 SoCs, the packet needs extra padding + if (priv->family_id == RTL8380_FAMILY_ID) { + if (len < ETH_ZLEN) + len = ETH_ZLEN; // SoC not automatically padding to ETH_ZLEN + else + len += 4; + } if (skb_padto(skb, len)) { ret = NETDEV_TX_OK; @@ -1280,6 +1299,12 @@ static int rtl838x_hw_receive(struct net_device *dev, int r, int budget) tag.queue, len, tag.reason, tag.port); skb->protocol = eth_type_trans(skb, dev); + if (dev->features & NETIF_F_RXCSUM) { + if (tag.crc_error) + skb_checksum_none_assert(skb); + else + skb->ip_summed = CHECKSUM_UNNECESSARY; + } dev->stats.rx_packets++; dev->stats.rx_bytes += len; @@ -1837,6 +1862,40 @@ static int rtl838x_mdio_remove(struct rtl838x_eth_priv *priv) return 0; } +static netdev_features_t rtl838x_fix_features(struct net_device *dev, + netdev_features_t features) +{ + return features; +} + +static int rtl83xx_set_features(struct net_device *dev, netdev_features_t features) +{ + struct rtl838x_eth_priv *priv = netdev_priv(dev); + + if ((features ^ dev->features) & NETIF_F_RXCSUM) { + if (!(features & NETIF_F_RXCSUM)) + sw_w32_mask(BIT(3), 0, priv->r->mac_port_ctrl(priv->cpu_port)); + else + sw_w32_mask(0, BIT(4), priv->r->mac_port_ctrl(priv->cpu_port)); + } + + return 0; +} + +static int rtl93xx_set_features(struct net_device *dev, netdev_features_t features) +{ + struct rtl838x_eth_priv *priv = netdev_priv(dev); + + if ((features ^ dev->features) & NETIF_F_RXCSUM) { + if (!(features & NETIF_F_RXCSUM)) + sw_w32_mask(BIT(4), 0, priv->r->mac_port_ctrl(priv->cpu_port)); + else + sw_w32_mask(0, BIT(4), priv->r->mac_port_ctrl(priv->cpu_port)); + } + + return 0; +} + static const struct net_device_ops rtl838x_eth_netdev_ops = { .ndo_open = rtl838x_eth_open, .ndo_stop = rtl838x_eth_stop, @@ -1846,6 +1905,8 @@ static const struct net_device_ops rtl838x_eth_netdev_ops = { .ndo_validate_addr = eth_validate_addr, .ndo_set_rx_mode = rtl838x_eth_set_multicast_list, .ndo_tx_timeout = rtl838x_eth_tx_timeout, + .ndo_set_features = rtl83xx_set_features, + .ndo_fix_features = rtl838x_fix_features, }; static const struct net_device_ops rtl839x_eth_netdev_ops = { @@ -1857,6 +1918,8 @@ static const struct net_device_ops rtl839x_eth_netdev_ops = { .ndo_validate_addr = eth_validate_addr, .ndo_set_rx_mode = rtl839x_eth_set_multicast_list, .ndo_tx_timeout = rtl838x_eth_tx_timeout, + .ndo_set_features = rtl83xx_set_features, + .ndo_fix_features = rtl838x_fix_features, }; static const struct net_device_ops rtl930x_eth_netdev_ops = { @@ -1868,6 +1931,8 @@ static const struct net_device_ops rtl930x_eth_netdev_ops = { .ndo_validate_addr = eth_validate_addr, .ndo_set_rx_mode = rtl930x_eth_set_multicast_list, .ndo_tx_timeout = rtl838x_eth_tx_timeout, + .ndo_set_features = rtl93xx_set_features, + .ndo_fix_features = rtl838x_fix_features, }; static const struct net_device_ops rtl931x_eth_netdev_ops = { @@ -1879,6 +1944,8 @@ static const struct net_device_ops rtl931x_eth_netdev_ops = { .ndo_validate_addr = eth_validate_addr, .ndo_set_rx_mode = rtl931x_eth_set_multicast_list, .ndo_tx_timeout = rtl838x_eth_tx_timeout, + .ndo_set_features = rtl93xx_set_features, + .ndo_fix_features = rtl838x_fix_features, }; static const struct phylink_mac_ops rtl838x_phylink_ops = { @@ -1975,6 +2042,8 @@ static int __init rtl838x_eth_probe(struct platform_device *pdev) dev->ethtool_ops = &rtl838x_ethtool_ops; dev->min_mtu = ETH_ZLEN; dev->max_mtu = 1536; + dev->features = NETIF_F_RXCSUM | NETIF_F_HW_CSUM; + dev->hw_features = NETIF_F_RXCSUM; priv->id = soc_info.id; priv->family_id = soc_info.family;