Revert "ixgbe: Manual AN-37 for troublesome link partners for X550 SFI"

This reverts commit 5657360.

According to the commit, it implements a manual AN-37 for some
"troublesome" Juniper MX5 switches. This appears to be a workaround for a
particular switch.

It has been reported that this causes a severe breakage for other switches,
including a Cisco 3560CX-12PD-S.

The code appears to be a workaround for a specific switch which fails to
link in SFI mode. It expects to see AN-37 auto negotiation in order to
link. The Cisco switch is not expecting AN-37 auto negotiation. When the
device starts the manual AN-37, the Cisco switch decides that the port is
confused and stops attempting to link with it. This persists until a power
cycle. A simple driver unload and reload does not resolve the issue, even
if loading with a version of the driver which lacks this workaround.

The authors of the workaround commit have not responded with
clarifications, and the result of the workaround is complete failure to
connect with other switches.

This appears to be a case where the driver can either "correctly" link with
the Juniper MX5 switch, at the cost of bricking the link with the Cisco
switch, or it can behave properly for the Cisco switch, but fail to link
with the Junipir MX5 switch. I do not know enough about the standards
involved to clearly determine whether either switch is at fault or behaving
incorrectly. Nor do I know whether there exists some alternative fix which
corrects behavior with both switches.

Revert the workaround for the Juniper switch.

Fixes: 5657360 ("ixgbe: Manual AN-37 for troublesome link partners for X550 SFI")
Link: https://lore.kernel.org/netdev/[email protected]/T/
Link: https://forum.proxmox.com/threads/intel-x553-sfp-ixgbe-no-go-on-pve8.135129/#post-612291
Signed-off-by: Jacob Keller <[email protected]>
Cc: Jeff Daly <[email protected]>
Cc: [email protected]
Reviewed-by: Simon Horman <[email protected]>
Link: https://lore.kernel.org/r/20240520-net-2024-05-20-revert-silicom-switch-workaround-v1-1-50f80f261c94@intel.com
Signed-off-by: Paolo Abeni <[email protected]>

drivers/net/ethernet/intel/ixgbe/ixgbe_type.h

@@ -3675,9 +3675,7 @@ 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)
@@ -3687,7 +3685,6 @@ 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)

drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c

@@ -1722,59 +1722,9 @@ static int ixgbe_setup_sfi_x550a(struct ixgbe_hw *hw, ixgbe_link_speed *speed)
 		return -EINVAL;
 	}
 
-	(void)mac->ops.write_iosf_sb_reg(hw,
-			IXGBE_KRM_PMD_FLX_MASK_ST20(hw->bus.lan_id),
-			IXGBE_SB_IOSF_TARGET_KR_PHY, reg_val);
-
-	/* 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);
+	status = mac->ops.write_iosf_sb_reg(hw,
+				IXGBE_KRM_PMD_FLX_MASK_ST20(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);