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sky2: EC-U performance and jumbo support
The Yukon EC Ultra chips have transmit settings for store and forward and PCI buffering. By setting these appropriately, normal performance goes from 750Mbytes/sec to 940Mbytes/sec (non-jumbo). It is also possible to do Jumbo mode, but it means turning off TSO and checksum offload so the performance gets worse. There isn't enough buffering for checksum offload to work. Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
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4f44d8ba09
commit
b628ed986d
2 changed files with 68 additions and 25 deletions
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@ -743,12 +743,17 @@ static void sky2_mac_init(struct sky2_hw *hw, unsigned port)
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if (hw->chip_id == CHIP_ID_YUKON_EC_U || hw->chip_id == CHIP_ID_YUKON_EX) {
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sky2_write8(hw, SK_REG(port, RX_GMF_LP_THR), 768/8);
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sky2_write8(hw, SK_REG(port, RX_GMF_UP_THR), 1024/8);
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if (hw->dev[port]->mtu > ETH_DATA_LEN) {
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/* set Tx GMAC FIFO Almost Empty Threshold */
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sky2_write32(hw, SK_REG(port, TX_GMF_AE_THR), 0x180);
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/* Disable Store & Forward mode for TX */
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sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T), TX_STFW_DIS);
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}
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/* set Tx GMAC FIFO Almost Empty Threshold */
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sky2_write32(hw, SK_REG(port, TX_GMF_AE_THR),
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(ECU_JUMBO_WM << 16) | ECU_AE_THR);
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if (hw->dev[port]->mtu > ETH_DATA_LEN)
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sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T),
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TX_JUMBO_ENA | TX_STFW_DIS);
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else
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sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T),
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TX_JUMBO_DIS | TX_STFW_ENA);
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}
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}
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@ -1281,7 +1286,7 @@ static int sky2_up(struct net_device *dev)
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/* Set almost empty threshold */
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if (hw->chip_id == CHIP_ID_YUKON_EC_U
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&& hw->chip_rev == CHIP_REV_YU_EC_U_A0)
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sky2_write16(hw, Q_ADDR(txqaddr[port], Q_AL), 0x1a0);
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sky2_write16(hw, Q_ADDR(txqaddr[port], Q_AL), ECU_TXFF_LEV);
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sky2_prefetch_init(hw, txqaddr[port], sky2->tx_le_map,
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TX_RING_SIZE - 1);
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@ -1587,13 +1592,6 @@ static int sky2_down(struct net_device *dev)
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sky2_write32(hw, RB_ADDR(txqaddr[port], RB_CTRL),
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RB_RST_SET | RB_DIS_OP_MD);
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/* WA for dev. #4.209 */
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if (hw->chip_id == CHIP_ID_YUKON_EC_U
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&& (hw->chip_rev == CHIP_REV_YU_EC_U_A1 || hw->chip_rev == CHIP_REV_YU_EC_U_B0))
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sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T),
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sky2->speed != SPEED_1000 ?
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TX_STFW_ENA : TX_STFW_DIS);
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ctrl = gma_read16(hw, port, GM_GP_CTRL);
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ctrl &= ~(GM_GPCR_TX_ENA | GM_GPCR_RX_ENA);
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gma_write16(hw, port, GM_GP_CTRL, ctrl);
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@ -1893,6 +1891,7 @@ static int sky2_change_mtu(struct net_device *dev, int new_mtu)
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{
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struct sky2_port *sky2 = netdev_priv(dev);
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struct sky2_hw *hw = sky2->hw;
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unsigned port = sky2->port;
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int err;
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u16 ctl, mode;
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u32 imask;
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@ -1900,10 +1899,6 @@ static int sky2_change_mtu(struct net_device *dev, int new_mtu)
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if (new_mtu < ETH_ZLEN || new_mtu > ETH_JUMBO_MTU)
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return -EINVAL;
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/* TSO on Yukon Ultra and MTU > 1500 not supported */
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if (hw->chip_id == CHIP_ID_YUKON_EC_U && new_mtu > ETH_DATA_LEN)
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dev->features &= ~NETIF_F_TSO;
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if (!netif_running(dev)) {
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dev->mtu = new_mtu;
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return 0;
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@ -1918,8 +1913,18 @@ static int sky2_change_mtu(struct net_device *dev, int new_mtu)
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synchronize_irq(hw->pdev->irq);
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ctl = gma_read16(hw, sky2->port, GM_GP_CTRL);
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gma_write16(hw, sky2->port, GM_GP_CTRL, ctl & ~GM_GPCR_RX_ENA);
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if (hw->chip_id == CHIP_ID_YUKON_EC_U || hw->chip_id == CHIP_ID_YUKON_EX) {
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if (new_mtu > ETH_DATA_LEN) {
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sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T),
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TX_JUMBO_ENA | TX_STFW_DIS);
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dev->features &= NETIF_F_TSO | NETIF_F_SG | NETIF_F_IP_CSUM;
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} else
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sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T),
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TX_JUMBO_DIS | TX_STFW_ENA);
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}
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ctl = gma_read16(hw, port, GM_GP_CTRL);
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gma_write16(hw, port, GM_GP_CTRL, ctl & ~GM_GPCR_RX_ENA);
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sky2_rx_stop(sky2);
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sky2_rx_clean(sky2);
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@ -1931,9 +1936,9 @@ static int sky2_change_mtu(struct net_device *dev, int new_mtu)
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if (dev->mtu > ETH_DATA_LEN)
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mode |= GM_SMOD_JUMBO_ENA;
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gma_write16(hw, sky2->port, GM_SERIAL_MODE, mode);
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gma_write16(hw, port, GM_SERIAL_MODE, mode);
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sky2_write8(hw, RB_ADDR(rxqaddr[sky2->port], RB_CTRL), RB_ENA_OP_MD);
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sky2_write8(hw, RB_ADDR(rxqaddr[port], RB_CTRL), RB_ENA_OP_MD);
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err = sky2_rx_start(sky2);
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sky2_write32(hw, B0_IMSK, imask);
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@ -1941,7 +1946,7 @@ static int sky2_change_mtu(struct net_device *dev, int new_mtu)
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if (err)
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dev_close(dev);
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else {
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gma_write16(hw, sky2->port, GM_GP_CTRL, ctl);
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gma_write16(hw, port, GM_GP_CTRL, ctl);
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netif_poll_enable(hw->dev[0]);
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netif_wake_queue(dev);
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@ -3334,6 +3339,36 @@ static void sky2_get_regs(struct net_device *dev, struct ethtool_regs *regs,
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regs->len - B3_RI_WTO_R1);
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}
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/* In order to do Jumbo packets on these chips, need to turn off the
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* transmit store/forward. Therefore checksum offload won't work.
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*/
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static int no_tx_offload(struct net_device *dev)
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{
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const struct sky2_port *sky2 = netdev_priv(dev);
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const struct sky2_hw *hw = sky2->hw;
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return dev->mtu > ETH_DATA_LEN &&
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(hw->chip_id == CHIP_ID_YUKON_EX
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|| hw->chip_id == CHIP_ID_YUKON_EC_U);
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}
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static int sky2_set_tx_csum(struct net_device *dev, u32 data)
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{
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if (data && no_tx_offload(dev))
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return -EINVAL;
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return ethtool_op_set_tx_csum(dev, data);
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}
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static int sky2_set_tso(struct net_device *dev, u32 data)
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{
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if (data && no_tx_offload(dev))
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return -EINVAL;
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return ethtool_op_set_tso(dev, data);
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}
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static const struct ethtool_ops sky2_ethtool_ops = {
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.get_settings = sky2_get_settings,
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.set_settings = sky2_set_settings,
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@ -3349,9 +3384,9 @@ static const struct ethtool_ops sky2_ethtool_ops = {
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.get_sg = ethtool_op_get_sg,
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.set_sg = ethtool_op_set_sg,
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.get_tx_csum = ethtool_op_get_tx_csum,
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.set_tx_csum = ethtool_op_set_tx_csum,
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.set_tx_csum = sky2_set_tx_csum,
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.get_tso = ethtool_op_get_tso,
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.set_tso = ethtool_op_set_tso,
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.set_tso = sky2_set_tso,
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.get_rx_csum = sky2_get_rx_csum,
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.set_rx_csum = sky2_set_rx_csum,
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.get_strings = sky2_get_strings,
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@ -741,6 +741,11 @@ enum {
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TX_GMF_RP = 0x0d70,/* 32 bit Tx GMAC FIFO Read Pointer */
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TX_GMF_RSTP = 0x0d74,/* 32 bit Tx GMAC FIFO Restart Pointer */
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TX_GMF_RLEV = 0x0d78,/* 32 bit Tx GMAC FIFO Read Level */
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/* Threshold values for Yukon-EC Ultra and Extreme */
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ECU_AE_THR = 0x0070, /* Almost Empty Threshold */
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ECU_TXFF_LEV = 0x01a0, /* Tx BMU FIFO Level */
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ECU_JUMBO_WM = 0x0080, /* Jumbo Mode Watermark */
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};
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/* Descriptor Poll Timer Registers */
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@ -1634,6 +1639,9 @@ enum {
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TX_VLAN_TAG_ON = 1<<25,/* enable VLAN tagging */
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TX_VLAN_TAG_OFF = 1<<24,/* disable VLAN tagging */
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TX_JUMBO_ENA = 1<<23,/* PCI Jumbo Mode enable (Yukon-EC Ultra) */
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TX_JUMBO_DIS = 1<<22,/* PCI Jumbo Mode enable (Yukon-EC Ultra) */
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GMF_WSP_TST_ON = 1<<18,/* Write Shadow Pointer Test On */
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GMF_WSP_TST_OFF = 1<<17,/* Write Shadow Pointer Test Off */
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GMF_WSP_STEP = 1<<16,/* Write Shadow Pointer Step/Increment */
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