Add flow control negotiation with link partner.
Signed-off-by: Jiawen Wu <jiawe...@trustnetic.com>
---
drivers/net/txgbe/base/txgbe_hw.c | 200 ++++++++++++++++++++++++++++++
drivers/net/txgbe/base/txgbe_hw.h | 3 +
2 files changed, 203 insertions(+)
diff --git a/drivers/net/txgbe/base/txgbe_hw.c
b/drivers/net/txgbe/base/txgbe_hw.c
index 7a6c30999..15ab82b01 100644
--- a/drivers/net/txgbe/base/txgbe_hw.c
+++ b/drivers/net/txgbe/base/txgbe_hw.c
@@ -1016,6 +1016,205 @@ s32 txgbe_fc_enable(struct txgbe_hw *hw)
return err;
}
+/**
+ * txgbe_negotiate_fc - Negotiate flow control
+ * @hw: pointer to hardware structure
+ * @adv_reg: flow control advertised settings
+ * @lp_reg: link partner's flow control settings
+ * @adv_sym: symmetric pause bit in advertisement
+ * @adv_asm: asymmetric pause bit in advertisement
+ * @lp_sym: symmetric pause bit in link partner advertisement
+ * @lp_asm: asymmetric pause bit in link partner advertisement
+ *
+ * Find the intersection between advertised settings and link partner's
+ * advertised settings
+ **/
+s32 txgbe_negotiate_fc(struct txgbe_hw *hw, u32 adv_reg, u32 lp_reg,
+ u32 adv_sym, u32 adv_asm, u32 lp_sym, u32 lp_asm)
+{
+ if ((!(adv_reg)) || (!(lp_reg))) {
+ DEBUGOUT("Local or link partner's advertised flow control "
+ "settings are NULL. Local: %x, link partner:
%x\n",
+ adv_reg, lp_reg);
+ return TXGBE_ERR_FC_NOT_NEGOTIATED;
+ }
+
+ if ((adv_reg & adv_sym) && (lp_reg & lp_sym)) {
+ /*
+ * 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 == txgbe_fc_full) {
+ hw->fc.current_mode = txgbe_fc_full;
+ DEBUGOUT("Flow Control = FULL.\n");
+ } else {
+ hw->fc.current_mode = txgbe_fc_rx_pause;
+ DEBUGOUT("Flow Control=RX PAUSE frames only\n");
+ }
+ } else if (!(adv_reg & adv_sym) && (adv_reg & adv_asm) &&
+ (lp_reg & lp_sym) && (lp_reg & lp_asm)) {
+ hw->fc.current_mode = txgbe_fc_tx_pause;
+ DEBUGOUT("Flow Control = TX PAUSE frames only.\n");
+ } else if ((adv_reg & adv_sym) && (adv_reg & adv_asm) &&
+ !(lp_reg & lp_sym) && (lp_reg & lp_asm)) {
+ hw->fc.current_mode = txgbe_fc_rx_pause;
+ DEBUGOUT("Flow Control = RX PAUSE frames only.\n");
+ } else {
+ hw->fc.current_mode = txgbe_fc_none;
+ DEBUGOUT("Flow Control = NONE.\n");
+ }
+ return 0;
+}
+
+/**
+ * txgbe_fc_autoneg_fiber - Enable flow control on 1 gig fiber
+ * @hw: pointer to hardware structure
+ *
+ * Enable flow control according on 1 gig fiber.
+ **/
+STATIC s32 txgbe_fc_autoneg_fiber(struct txgbe_hw *hw)
+{
+ u32 pcs_anadv_reg, pcs_lpab_reg;
+ s32 err = TXGBE_ERR_FC_NOT_NEGOTIATED;
+
+ /*
+ * 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
+ */
+
+ pcs_anadv_reg = rd32_epcs(hw, SR_MII_MMD_AN_ADV);
+ pcs_lpab_reg = rd32_epcs(hw, SR_MII_MMD_LP_BABL);
+
+ err = txgbe_negotiate_fc(hw, pcs_anadv_reg,
+ pcs_lpab_reg,
+ SR_MII_MMD_AN_ADV_PAUSE_SYM,
+ SR_MII_MMD_AN_ADV_PAUSE_ASM,
+ SR_MII_MMD_AN_ADV_PAUSE_SYM,
+ SR_MII_MMD_AN_ADV_PAUSE_ASM);
+
+ return err;
+}
+
+/**
+ * txgbe_fc_autoneg_backplane - Enable flow control IEEE clause 37
+ * @hw: pointer to hardware structure
+ *
+ * Enable flow control according to IEEE clause 37.
+ **/
+STATIC s32 txgbe_fc_autoneg_backplane(struct txgbe_hw *hw)
+{
+ u32 anlp1_reg, autoc_reg;
+ s32 err = TXGBE_ERR_FC_NOT_NEGOTIATED;
+
+ /*
+ * Read the 10g AN autoc and LP ability registers and resolve
+ * local flow control settings accordingly
+ */
+ autoc_reg = rd32_epcs(hw, SR_AN_MMD_ADV_REG1);
+ anlp1_reg = rd32_epcs(hw, SR_AN_MMD_LP_ABL1);
+
+ err = txgbe_negotiate_fc(hw, autoc_reg,
+ anlp1_reg,
+ SR_AN_MMD_ADV_REG1_PAUSE_SYM,
+ SR_AN_MMD_ADV_REG1_PAUSE_ASM,
+ SR_AN_MMD_ADV_REG1_PAUSE_SYM,
+ SR_AN_MMD_ADV_REG1_PAUSE_ASM);
+
+ return err;
+}
+
+/**
+ * txgbe_fc_autoneg_copper - Enable flow control IEEE clause 37
+ * @hw: pointer to hardware structure
+ *
+ * Enable flow control according to IEEE clause 37.
+ **/
+STATIC s32 txgbe_fc_autoneg_copper(struct txgbe_hw *hw)
+{
+ u16 technology_ability_reg = 0;
+ u16 lp_technology_ability_reg = 0;
+
+ hw->phy.read_reg(hw, TXGBE_MD_AUTO_NEG_ADVT,
+ TXGBE_MD_DEV_AUTO_NEG,
+ &technology_ability_reg);
+ hw->phy.read_reg(hw, TXGBE_MD_AUTO_NEG_LP,
+ TXGBE_MD_DEV_AUTO_NEG,
+ &lp_technology_ability_reg);
+
+ return txgbe_negotiate_fc(hw, (u32)technology_ability_reg,
+ (u32)lp_technology_ability_reg,
+ TXGBE_TAF_SYM_PAUSE, TXGBE_TAF_ASM_PAUSE,
+ TXGBE_TAF_SYM_PAUSE, TXGBE_TAF_ASM_PAUSE);
+}
+
+/**
+ * txgbe_fc_autoneg - Configure flow control
+ * @hw: pointer to hardware structure
+ *
+ * Compares our advertised flow control capabilities to those advertised by
+ * our link partner, and determines the proper flow control mode to use.
+ **/
+void txgbe_fc_autoneg(struct txgbe_hw *hw)
+{
+ s32 err = TXGBE_ERR_FC_NOT_NEGOTIATED;
+ u32 speed;
+ bool link_up;
+
+ DEBUGFUNC("txgbe_fc_autoneg");
+
+ /*
+ * 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
+ * - link is not up.
+ */
+ if (hw->fc.disable_fc_autoneg) {
+ DEBUGOUT("Flow control autoneg is disabled");
+ goto out;
+ }
+
+ hw->mac.check_link(hw, &speed, &link_up, false);
+ if (!link_up) {
+ DEBUGOUT("The link is down");
+ goto out;
+ }
+
+ switch (hw->phy.media_type) {
+ /* Autoneg flow control on fiber adapters */
+ case txgbe_media_type_fiber_qsfp:
+ case txgbe_media_type_fiber:
+ if (speed == TXGBE_LINK_SPEED_1GB_FULL)
+ err = txgbe_fc_autoneg_fiber(hw);
+ break;
+
+ /* Autoneg flow control on backplane adapters */
+ case txgbe_media_type_backplane:
+ err = txgbe_fc_autoneg_backplane(hw);
+ break;
+
+ /* Autoneg flow control on copper adapters */
+ case txgbe_media_type_copper:
+ if (txgbe_device_supports_autoneg_fc(hw))
+ err = txgbe_fc_autoneg_copper(hw);
+ break;
+
+ default:
+ break;
+ }
+
+out:
+ if (err == 0) {
+ hw->fc.fc_was_autonegged = true;
+ } else {
+ hw->fc.fc_was_autonegged = false;
+ hw->fc.current_mode = hw->fc.requested_mode;
+ }
+}
+
/**
* txgbe_acquire_swfw_sync - Acquire SWFW semaphore
* @hw: pointer to hardware structure
@@ -2588,6 +2787,7 @@ s32 txgbe_init_ops_pf(struct txgbe_hw *hw)
/* Flow Control */
mac->fc_enable = txgbe_fc_enable;
mac->setup_fc = txgbe_setup_fc;
+ mac->fc_autoneg = txgbe_fc_autoneg;
/* Link */
mac->get_link_capabilities = txgbe_get_link_capabilities_raptor;
diff --git a/drivers/net/txgbe/base/txgbe_hw.h
b/drivers/net/txgbe/base/txgbe_hw.h
index 1e1cbb2eb..02369d6df 100644
--- a/drivers/net/txgbe/base/txgbe_hw.h
+++ b/drivers/net/txgbe/base/txgbe_hw.h
@@ -30,6 +30,7 @@ s32 txgbe_enable_sec_tx_path(struct txgbe_hw *hw);
s32 txgbe_fc_enable(struct txgbe_hw *hw);
bool txgbe_device_supports_autoneg_fc(struct txgbe_hw *hw);
+void txgbe_fc_autoneg(struct txgbe_hw *hw);
s32 txgbe_setup_fc(struct txgbe_hw *hw);
s32 txgbe_validate_mac_addr(u8 *mac_addr);
@@ -76,6 +77,8 @@ s32 txgbe_setup_mac_link_multispeed_fiber(struct txgbe_hw *hw,
u32 speed,
bool autoneg_wait_to_complete);
void txgbe_set_mta(struct txgbe_hw *hw, u8 *mc_addr);
+s32 txgbe_negotiate_fc(struct txgbe_hw *hw, u32 adv_reg, u32 lp_reg,
+ u32 adv_sym, u32 adv_asm, u32 lp_sym, u32 lp_asm);
s32 txgbe_init_shared_code(struct txgbe_hw *hw);
s32 txgbe_set_mac_type(struct txgbe_hw *hw);
s32 txgbe_init_ops_pf(struct txgbe_hw *hw);
--
2.18.4
