[Intel-wired-lan] [PATCH] ixgbe: Manual AN-37 for troublesome link partners for X550 SFI

[Jeff Daly <jeffd@silicom-usa.com>]

Resubmit commit 565736048bd5 ("ixgbe: Manual AN-37 for troublesome link
partners for X550 SFI")

Some (Juniper MX5) SFP link partners exhibit a disinclination to
autonegotiate with X550 configured in SFI mode.  This patch enables
a manual AN-37 restart to work around the problem.

Resubmitted patch includes a module parameter (default disabled) to
isolate changes.

Signed-off-by: Jeff Daly <jeffd@silicom-usa.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |  8 +++
 drivers/net/ethernet/intel/ixgbe/ixgbe_type.h |  4 ++
 drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c | 52 +++++++++++++++++++
 3 files changed, 64 insertions(+)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 8b8404d8c946..ef77df0f94a6 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -157,6 +157,11 @@ module_param(allow_unsupported_sfp, bool, 0444);
 MODULE_PARM_DESC(allow_unsupported_sfp,
 		 "Allow unsupported and untested SFP+ modules on 82599-based adapters");
 
+static bool manual_an37_for_sfi;
+module_param(manual_an37_for_sfi, bool, 0444);
+MODULE_PARM_DESC(manual_an37_for_sfi,
+		 "Manual AN-37 for troublesome link partners for X550 SFI");
+
 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
 static int debug = -1;
 module_param(debug, int, 0);
@@ -10977,6 +10982,9 @@ static int ixgbe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (allow_unsupported_sfp)
 		hw->allow_unsupported_sfp = allow_unsupported_sfp;
 
+	if (manual_an37_for_sfi)
+		hw->manual_an37_for_sfi = manual_an37_for_sfi;
+
 	/* reset_hw fills in the perm_addr as well */
 	hw->phy.reset_if_overtemp = true;
 	err = hw->mac.ops.reset_hw(hw);
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
index 346e3d9114a8..288bb2be3c23 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -3654,6 +3654,7 @@ struct ixgbe_hw {
 	bool				allow_unsupported_sfp;
 	bool				wol_enabled;
 	bool				need_crosstalk_fix;
+	bool				manual_an37_for_sfi;
 };
 
 struct ixgbe_info {
@@ -3675,7 +3676,9 @@ struct ixgbe_info {
 #define IXGBE_KRM_LINK_S1(P)		((P) ? 0x8200 : 0x4200)
 #define IXGBE_KRM_LINK_CTRL_1(P)	((P) ? 0x820C : 0x420C)
 #define IXGBE_KRM_AN_CNTL_1(P)		((P) ? 0x822C : 0x422C)
+#define IXGBE_KRM_AN_CNTL_4(P)		((P) ? 0x8238 : 0x4238)
 #define IXGBE_KRM_AN_CNTL_8(P)		((P) ? 0x8248 : 0x4248)
+#define IXGBE_KRM_PCS_KX_AN(P)		((P) ? 0x9918 : 0x5918)
 #define IXGBE_KRM_SGMII_CTRL(P)		((P) ? 0x82A0 : 0x42A0)
 #define IXGBE_KRM_LP_BASE_PAGE_HIGH(P)	((P) ? 0x836C : 0x436C)
 #define IXGBE_KRM_DSP_TXFFE_STATE_4(P)	((P) ? 0x8634 : 0x4634)
@@ -3685,6 +3688,7 @@ struct ixgbe_info {
 #define IXGBE_KRM_PMD_FLX_MASK_ST20(P)	((P) ? 0x9054 : 0x5054)
 #define IXGBE_KRM_TX_COEFF_CTRL_1(P)	((P) ? 0x9520 : 0x5520)
 #define IXGBE_KRM_RX_ANA_CTL(P)		((P) ? 0x9A00 : 0x5A00)
+#define IXGBE_KRM_FLX_TMRS_CTRL_ST31(P)	((P) ? 0x9180 : 0x5180)
 
 #define IXGBE_KRM_PMD_FLX_MASK_ST20_SFI_10G_DA		~(0x3 << 20)
 #define IXGBE_KRM_PMD_FLX_MASK_ST20_SFI_10G_SR		BIT(20)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
index a5f644934445..e3117ccf092c 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
@@ -1726,6 +1726,58 @@ static int ixgbe_setup_sfi_x550a(struct ixgbe_hw *hw, ixgbe_link_speed *speed)
 				IXGBE_KRM_PMD_FLX_MASK_ST20(hw->bus.lan_id),
 				IXGBE_SB_IOSF_TARGET_KR_PHY, reg_val);
 
+	if (hw->manual_an37_for_sfi) {
+		/* change mode enforcement rules to hybrid */
+		(void)mac->ops.read_iosf_sb_reg(hw,
+			IXGBE_KRM_FLX_TMRS_CTRL_ST31(hw->bus.lan_id),
+			IXGBE_SB_IOSF_TARGET_KR_PHY, &reg_val);
+			reg_val |= 0x0400;
+
+		(void)mac->ops.write_iosf_sb_reg(hw,
+			IXGBE_KRM_FLX_TMRS_CTRL_ST31(hw->bus.lan_id),
+			IXGBE_SB_IOSF_TARGET_KR_PHY, reg_val);
+
+		/* manually control the config */
+		(void)mac->ops.read_iosf_sb_reg(hw,
+			IXGBE_KRM_LINK_CTRL_1(hw->bus.lan_id),
+			IXGBE_SB_IOSF_TARGET_KR_PHY, &reg_val);
+		reg_val |= 0x20002240;
+
+		(void)mac->ops.write_iosf_sb_reg(hw,
+			IXGBE_KRM_LINK_CTRL_1(hw->bus.lan_id),
+			IXGBE_SB_IOSF_TARGET_KR_PHY, reg_val);
+
+		/* move the AN base page values */
+		(void)mac->ops.read_iosf_sb_reg(hw,
+			IXGBE_KRM_PCS_KX_AN(hw->bus.lan_id),
+			IXGBE_SB_IOSF_TARGET_KR_PHY, &reg_val);
+		reg_val |= 0x1;
+
+		(void)mac->ops.write_iosf_sb_reg(hw,
+			IXGBE_KRM_PCS_KX_AN(hw->bus.lan_id),
+			IXGBE_SB_IOSF_TARGET_KR_PHY, reg_val);
+
+		/* set the AN37 over CB mode */
+		(void)mac->ops.read_iosf_sb_reg(hw,
+			IXGBE_KRM_AN_CNTL_4(hw->bus.lan_id),
+			IXGBE_SB_IOSF_TARGET_KR_PHY, &reg_val);
+		reg_val |= 0x20000000;
+
+		(void)mac->ops.write_iosf_sb_reg(hw,
+			IXGBE_KRM_AN_CNTL_4(hw->bus.lan_id),
+			IXGBE_SB_IOSF_TARGET_KR_PHY, reg_val);
+
+		/* restart AN manually */
+		(void)mac->ops.read_iosf_sb_reg(hw,
+			IXGBE_KRM_LINK_CTRL_1(hw->bus.lan_id),
+			IXGBE_SB_IOSF_TARGET_KR_PHY, &reg_val);
+		reg_val |= IXGBE_KRM_LINK_CTRL_1_TETH_AN_RESTART;
+
+		(void)mac->ops.write_iosf_sb_reg(hw,
+			IXGBE_KRM_LINK_CTRL_1(hw->bus.lan_id),
+			IXGBE_SB_IOSF_TARGET_KR_PHY, reg_val);
+	}
+
 	/* Toggle port SW reset by AN reset. */
 	status = ixgbe_restart_an_internal_phy_x550em(hw);
 
-- 
2.25.1