From 539e5f02c5d11d14a75dae88ed92b32386649e75 Mon Sep 17 00:00:00 2001 From: Peter P Waskiewicz Jr Date: Wed, 30 Sep 2009 12:07:38 +0000 Subject: ixgbe: Fix backplane flow control autoneg Backplane flow control autonegotiation is currently broken for ixgbe devices. This patch fixes the flow control issues with clause 37 autoneg. Signed-off-by: Peter P Waskiewicz Jr Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- drivers/net/ixgbe/ixgbe_common.c | 228 ++++++++++++++++++++++++++++++--------- 1 file changed, 177 insertions(+), 51 deletions(-) (limited to 'drivers/net/ixgbe/ixgbe_common.c') diff --git a/drivers/net/ixgbe/ixgbe_common.c b/drivers/net/ixgbe/ixgbe_common.c index 6621e172df3d..143b0fcbe958 100644 --- a/drivers/net/ixgbe/ixgbe_common.c +++ b/drivers/net/ixgbe/ixgbe_common.c @@ -1663,7 +1663,7 @@ s32 ixgbe_fc_enable_generic(struct ixgbe_hw *hw, s32 packetbuf_num) #endif /* CONFIG_DCB */ default: hw_dbg(hw, "Flow control param set incorrectly\n"); - ret_val = -IXGBE_ERR_CONFIG; + ret_val = IXGBE_ERR_CONFIG; goto out; break; } @@ -1734,75 +1734,140 @@ s32 ixgbe_fc_autoneg(struct ixgbe_hw *hw) s32 ret_val = 0; ixgbe_link_speed speed; u32 pcs_anadv_reg, pcs_lpab_reg, linkstat; + u32 links2, anlp1_reg, autoc_reg, links; bool link_up; /* * AN should have completed when the cable was plugged in. * Look for reasons to bail out. Bail out if: * - FC autoneg is disabled, or if - * - we don't have multispeed fiber, or if - * - we're not running at 1G, or if - * - link is not up, or if - * - link is up but AN did not complete, or if - * - link is up and AN completed but timed out + * - link is not up. * - * Since we're being called from an LSC, link is already know to be up. + * Since we're being called from an LSC, link is already known to be up. * So use link_up_wait_to_complete=false. */ hw->mac.ops.check_link(hw, &speed, &link_up, false); - linkstat = IXGBE_READ_REG(hw, IXGBE_PCS1GLSTA); - - if (hw->fc.disable_fc_autoneg || - !hw->phy.multispeed_fiber || - (speed != IXGBE_LINK_SPEED_1GB_FULL) || - !link_up || - ((linkstat & IXGBE_PCS1GLSTA_AN_COMPLETE) == 0) || - ((linkstat & IXGBE_PCS1GLSTA_AN_TIMED_OUT) == 1)) { + + if (hw->fc.disable_fc_autoneg || (!link_up)) { hw->fc.fc_was_autonegged = false; hw->fc.current_mode = hw->fc.requested_mode; - hw_dbg(hw, "Autoneg FC was skipped.\n"); goto out; } + /* + * On backplane, bail out if + * - backplane autoneg was not completed, or if + * - link partner is not AN enabled + */ + if (hw->phy.media_type == ixgbe_media_type_backplane) { + links = IXGBE_READ_REG(hw, IXGBE_LINKS); + links2 = IXGBE_READ_REG(hw, IXGBE_LINKS2); + if (((links & IXGBE_LINKS_KX_AN_COMP) == 0) || + ((links2 & IXGBE_LINKS2_AN_SUPPORTED) == 0)) { + hw->fc.fc_was_autonegged = false; + hw->fc.current_mode = hw->fc.requested_mode; + goto out; + } + } + + /* + * On multispeed fiber at 1g, bail out if + * - link is up but AN did not complete, or if + * - link is up and AN completed but timed out + */ + if (hw->phy.multispeed_fiber && (speed == IXGBE_LINK_SPEED_1GB_FULL)) { + linkstat = IXGBE_READ_REG(hw, IXGBE_PCS1GLSTA); + if (((linkstat & IXGBE_PCS1GLSTA_AN_COMPLETE) == 0) || + ((linkstat & IXGBE_PCS1GLSTA_AN_TIMED_OUT) == 1)) { + hw->fc.fc_was_autonegged = false; + hw->fc.current_mode = hw->fc.requested_mode; + goto out; + } + } + /* * Read the AN advertisement and LP ability registers and resolve * local flow control settings accordingly */ - pcs_anadv_reg = IXGBE_READ_REG(hw, IXGBE_PCS1GANA); - pcs_lpab_reg = IXGBE_READ_REG(hw, IXGBE_PCS1GANLP); - if ((pcs_anadv_reg & IXGBE_PCS1GANA_SYM_PAUSE) && - (pcs_lpab_reg & IXGBE_PCS1GANA_SYM_PAUSE)) { + if ((speed == IXGBE_LINK_SPEED_1GB_FULL) && + (hw->phy.media_type != ixgbe_media_type_backplane)) { + pcs_anadv_reg = IXGBE_READ_REG(hw, IXGBE_PCS1GANA); + pcs_lpab_reg = IXGBE_READ_REG(hw, IXGBE_PCS1GANLP); + if ((pcs_anadv_reg & IXGBE_PCS1GANA_SYM_PAUSE) && + (pcs_lpab_reg & IXGBE_PCS1GANA_SYM_PAUSE)) { + /* + * Now we need to check if the user selected Rx ONLY + * of pause frames. In this case, we had to advertise + * FULL flow control because we could not advertise RX + * ONLY. Hence, we must now check to see if we need to + * turn OFF the TRANSMISSION of PAUSE frames. + */ + if (hw->fc.requested_mode == ixgbe_fc_full) { + hw->fc.current_mode = ixgbe_fc_full; + hw_dbg(hw, "Flow Control = FULL.\n"); + } else { + hw->fc.current_mode = ixgbe_fc_rx_pause; + hw_dbg(hw, "Flow Control=RX PAUSE only\n"); + } + } else if (!(pcs_anadv_reg & IXGBE_PCS1GANA_SYM_PAUSE) && + (pcs_anadv_reg & IXGBE_PCS1GANA_ASM_PAUSE) && + (pcs_lpab_reg & IXGBE_PCS1GANA_SYM_PAUSE) && + (pcs_lpab_reg & IXGBE_PCS1GANA_ASM_PAUSE)) { + hw->fc.current_mode = ixgbe_fc_tx_pause; + hw_dbg(hw, "Flow Control = TX PAUSE frames only.\n"); + } else if ((pcs_anadv_reg & IXGBE_PCS1GANA_SYM_PAUSE) && + (pcs_anadv_reg & IXGBE_PCS1GANA_ASM_PAUSE) && + !(pcs_lpab_reg & IXGBE_PCS1GANA_SYM_PAUSE) && + (pcs_lpab_reg & IXGBE_PCS1GANA_ASM_PAUSE)) { + hw->fc.current_mode = ixgbe_fc_rx_pause; + hw_dbg(hw, "Flow Control = RX PAUSE frames only.\n"); + } else { + hw->fc.current_mode = ixgbe_fc_none; + hw_dbg(hw, "Flow Control = NONE.\n"); + } + } + + if (hw->phy.media_type == ixgbe_media_type_backplane) { /* - * Now we need to check if the user selected Rx ONLY - * of pause frames. In this case, we had to advertise - * FULL flow control because we could not advertise RX - * ONLY. Hence, we must now check to see if we need to - * turn OFF the TRANSMISSION of PAUSE frames. + * Read the 10g AN autoc and LP ability registers and resolve + * local flow control settings accordingly */ - if (hw->fc.requested_mode == ixgbe_fc_full) { - hw->fc.current_mode = ixgbe_fc_full; - hw_dbg(hw, "Flow Control = FULL.\n"); - } else { + autoc_reg = IXGBE_READ_REG(hw, IXGBE_AUTOC); + anlp1_reg = IXGBE_READ_REG(hw, IXGBE_ANLP1); + + if ((autoc_reg & IXGBE_AUTOC_SYM_PAUSE) && + (anlp1_reg & IXGBE_ANLP1_SYM_PAUSE)) { + /* + * Now we need to check if the user selected Rx ONLY + * of pause frames. In this case, we had to advertise + * FULL flow control because we could not advertise RX + * ONLY. Hence, we must now check to see if we need to + * turn OFF the TRANSMISSION of PAUSE frames. + */ + if (hw->fc.requested_mode == ixgbe_fc_full) { + hw->fc.current_mode = ixgbe_fc_full; + hw_dbg(hw, "Flow Control = FULL.\n"); + } else { + hw->fc.current_mode = ixgbe_fc_rx_pause; + hw_dbg(hw, "Flow Control=RX PAUSE only\n"); + } + } else if (!(autoc_reg & IXGBE_AUTOC_SYM_PAUSE) && + (autoc_reg & IXGBE_AUTOC_ASM_PAUSE) && + (anlp1_reg & IXGBE_ANLP1_SYM_PAUSE) && + (anlp1_reg & IXGBE_ANLP1_ASM_PAUSE)) { + hw->fc.current_mode = ixgbe_fc_tx_pause; + hw_dbg(hw, "Flow Control = TX PAUSE frames only.\n"); + } else if ((autoc_reg & IXGBE_AUTOC_SYM_PAUSE) && + (autoc_reg & IXGBE_AUTOC_ASM_PAUSE) && + !(anlp1_reg & IXGBE_ANLP1_SYM_PAUSE) && + (anlp1_reg & IXGBE_ANLP1_ASM_PAUSE)) { hw->fc.current_mode = ixgbe_fc_rx_pause; hw_dbg(hw, "Flow Control = RX PAUSE frames only.\n"); + } else { + hw->fc.current_mode = ixgbe_fc_none; + hw_dbg(hw, "Flow Control = NONE.\n"); } - } else if (!(pcs_anadv_reg & IXGBE_PCS1GANA_SYM_PAUSE) && - (pcs_anadv_reg & IXGBE_PCS1GANA_ASM_PAUSE) && - (pcs_lpab_reg & IXGBE_PCS1GANA_SYM_PAUSE) && - (pcs_lpab_reg & IXGBE_PCS1GANA_ASM_PAUSE)) { - hw->fc.current_mode = ixgbe_fc_tx_pause; - hw_dbg(hw, "Flow Control = TX PAUSE frames only.\n"); - } else if ((pcs_anadv_reg & IXGBE_PCS1GANA_SYM_PAUSE) && - (pcs_anadv_reg & IXGBE_PCS1GANA_ASM_PAUSE) && - !(pcs_lpab_reg & IXGBE_PCS1GANA_SYM_PAUSE) && - (pcs_lpab_reg & IXGBE_PCS1GANA_ASM_PAUSE)) { - hw->fc.current_mode = ixgbe_fc_rx_pause; - hw_dbg(hw, "Flow Control = RX PAUSE frames only.\n"); - } else { - hw->fc.current_mode = ixgbe_fc_none; - hw_dbg(hw, "Flow Control = NONE.\n"); } - /* Record that current_mode is the result of a successful autoneg */ hw->fc.fc_was_autonegged = true; @@ -1919,7 +1984,7 @@ static s32 ixgbe_setup_fc(struct ixgbe_hw *hw, s32 packetbuf_num) #endif /* CONFIG_DCB */ default: hw_dbg(hw, "Flow control param set incorrectly\n"); - ret_val = -IXGBE_ERR_CONFIG; + ret_val = IXGBE_ERR_CONFIG; goto out; break; } @@ -1927,9 +1992,6 @@ static s32 ixgbe_setup_fc(struct ixgbe_hw *hw, s32 packetbuf_num) IXGBE_WRITE_REG(hw, IXGBE_PCS1GANA, reg); reg = IXGBE_READ_REG(hw, IXGBE_PCS1GLCTL); - /* Enable and restart autoneg to inform the link partner */ - reg |= IXGBE_PCS1GLCTL_AN_ENABLE | IXGBE_PCS1GLCTL_AN_RESTART; - /* Disable AN timeout */ if (hw->fc.strict_ieee) reg &= ~IXGBE_PCS1GLCTL_AN_1G_TIMEOUT_EN; @@ -1937,6 +1999,70 @@ static s32 ixgbe_setup_fc(struct ixgbe_hw *hw, s32 packetbuf_num) IXGBE_WRITE_REG(hw, IXGBE_PCS1GLCTL, reg); hw_dbg(hw, "Set up FC; PCS1GLCTL = 0x%08X\n", reg); + /* + * Set up the 10G flow control advertisement registers so the HW + * can do fc autoneg once the cable is plugged in. If we end up + * using 1g instead, this is harmless. + */ + reg = IXGBE_READ_REG(hw, IXGBE_AUTOC); + + /* + * The possible values of fc.requested_mode are: + * 0: Flow control is completely disabled + * 1: Rx flow control is enabled (we can receive pause frames, + * but not send pause frames). + * 2: Tx flow control is enabled (we can send pause frames but + * we do not support receiving pause frames). + * 3: Both Rx and Tx flow control (symmetric) are enabled. + * other: Invalid. + */ + switch (hw->fc.requested_mode) { + case ixgbe_fc_none: + /* Flow control completely disabled by software override. */ + reg &= ~(IXGBE_AUTOC_SYM_PAUSE | IXGBE_AUTOC_ASM_PAUSE); + break; + case ixgbe_fc_rx_pause: + /* + * Rx Flow control is enabled and Tx Flow control is + * disabled by software override. Since there really + * isn't a way to advertise that we are capable of RX + * Pause ONLY, we will advertise that we support both + * symmetric and asymmetric Rx PAUSE. Later, we will + * disable the adapter's ability to send PAUSE frames. + */ + reg |= (IXGBE_AUTOC_SYM_PAUSE | IXGBE_AUTOC_ASM_PAUSE); + break; + case ixgbe_fc_tx_pause: + /* + * Tx Flow control is enabled, and Rx Flow control is + * disabled by software override. + */ + reg |= (IXGBE_AUTOC_ASM_PAUSE); + reg &= ~(IXGBE_AUTOC_SYM_PAUSE); + break; + case ixgbe_fc_full: + /* Flow control (both Rx and Tx) is enabled by SW override. */ + reg |= (IXGBE_AUTOC_SYM_PAUSE | IXGBE_AUTOC_ASM_PAUSE); + break; +#ifdef CONFIG_DCB + case ixgbe_fc_pfc: + goto out; + break; +#endif /* CONFIG_DCB */ + default: + hw_dbg(hw, "Flow control param set incorrectly\n"); + ret_val = IXGBE_ERR_CONFIG; + goto out; + break; + } + /* + * AUTOC restart handles negotiation of 1G and 10G. There is + * no need to set the PCS1GCTL register. + */ + reg |= IXGBE_AUTOC_AN_RESTART; + IXGBE_WRITE_REG(hw, IXGBE_AUTOC, reg); + hw_dbg(hw, "Set up FC; IXGBE_AUTOC = 0x%08X\n", reg); + out: return ret_val; } @@ -2000,7 +2126,7 @@ s32 ixgbe_acquire_swfw_sync(struct ixgbe_hw *hw, u16 mask) while (timeout) { if (ixgbe_get_eeprom_semaphore(hw)) - return -IXGBE_ERR_SWFW_SYNC; + return IXGBE_ERR_SWFW_SYNC; gssr = IXGBE_READ_REG(hw, IXGBE_GSSR); if (!(gssr & (fwmask | swmask))) @@ -2017,7 +2143,7 @@ s32 ixgbe_acquire_swfw_sync(struct ixgbe_hw *hw, u16 mask) if (!timeout) { hw_dbg(hw, "Driver can't access resource, GSSR timeout.\n"); - return -IXGBE_ERR_SWFW_SYNC; + return IXGBE_ERR_SWFW_SYNC; } gssr |= swmask; -- cgit v1.2.3-59-g8ed1b