[PATCH 2/9] common/sfc_efx/base: fix flow control setting on legacy MCDI

[Ivan Malov <ivan.malov@arknetworks.am>]

On X2 adaptors, tests have shown a mismatch between the mode the user asks
for and the resulting one, given the partner is set to use autonegotiation.
For example, asking for 'RX_PAUSE' results in 'FULL' being actually in use.

As per 'SET_MAC' MCDI documentation (in 'efx_regs_mcdi.h'), it is wrong to
set 'FCNTL' field to 'AUTO' when the user wants a fixed mode. Correct this.

Fixes: e7cd430c864f ("net/sfc/base: import SFN7xxx family support")
Cc: stable@dpdk.org

Signed-off-by: Ivan Malov <ivan.malov@arknetworks.am>
Reviewed-by: Andy Moreton <andy.moreton@amd.com>
---
 drivers/common/sfc_efx/base/ef10_mac.c | 35 ++++++++++++++++++++------
 1 file changed, 27 insertions(+), 8 deletions(-)

diff --git a/drivers/common/sfc_efx/base/ef10_mac.c b/drivers/common/sfc_efx/base/ef10_mac.c
index bfc82b80c7..016bd88774 100644
--- a/drivers/common/sfc_efx/base/ef10_mac.c
+++ b/drivers/common/sfc_efx/base/ef10_mac.c
@@ -273,6 +273,7 @@ ef10_mac_reconfigure(
 	efx_mcdi_req_t req;
 	EFX_MCDI_DECLARE_BUF(payload, MC_CMD_SET_MAC_IN_LEN,
 		MC_CMD_SET_MAC_OUT_LEN);
+	uint32_t fcntl;
 	efx_rc_t rc;
 
 	req.emr_cmd = MC_CMD_SET_MAC;
@@ -299,13 +300,29 @@ ef10_mac_reconfigure(
 				    SET_MAC_IN_REJECT_UNCST, 0,
 				    SET_MAC_IN_REJECT_BRDCST, 0);
 
-	/*
-	 * Flow control, whether it is auto-negotiated or not,
-	 * is set via the PHY advertised capabilities.  When set to
-	 * automatic the MAC will use the PHY settings to determine
-	 * the flow control settings.
-	 */
-	MCDI_IN_SET_DWORD(req, SET_MAC_IN_FCNTL, MC_CMD_FCNTL_AUTO);
+	if (epp->ep_fcntl_autoneg != B_FALSE) {
+		fcntl = MC_CMD_FCNTL_AUTO;
+	} else {
+		switch (epp->ep_fcntl) {
+		case 0:
+			fcntl = MC_CMD_FCNTL_OFF;
+			break;
+		case EFX_FCNTL_RESPOND:
+			fcntl = MC_CMD_FCNTL_RESPOND;
+			break;
+		case EFX_FCNTL_GENERATE:
+			fcntl = MC_CMD_FCNTL_GENERATE;
+			break;
+		case EFX_FCNTL_RESPOND | EFX_FCNTL_GENERATE:
+			fcntl = MC_CMD_FCNTL_BIDIR;
+			break;
+		default:
+			rc = EINVAL;
+			goto fail1;
+		}
+	}
+
+	MCDI_IN_SET_DWORD(req, SET_MAC_IN_FCNTL, fcntl);
 
 	/* Include the Ethernet frame checksum in RX packets if it's required */
 	MCDI_IN_POPULATE_DWORD_1(req, SET_MAC_IN_FLAGS,
@@ -321,7 +338,7 @@ ef10_mac_reconfigure(
 		 */
 		if (req.emr_rc != EACCES) {
 			rc = req.emr_rc;
-			goto fail1;
+			goto fail2;
 		}
 	}
 
@@ -338,6 +355,8 @@ ef10_mac_reconfigure(
 
 	return (0);
 
+fail2:
+	EFSYS_PROBE(fail2);
 fail1:
 	EFSYS_PROBE1(fail1, efx_rc_t, rc);
 
-- 
2.47.3