[dpdk-dev] [PATCH 8/8] net/bnxt: fix the check for autoneg enablement in the PHY FW

[Kalesh A P]

From: Somnath Kotur <somnath.kotur at broadcom.com>

The current combination of checks to determine whether autoneg is
enabled in the card is a bit convoluted and may become incorrect
as well in the future as one of the fields being used - auto_link_speed
might become deprecated.
Switch to using the 'auto_mode' field obtained from the response of
HWRM_PHY_QCFG cmd as that is always deterministically set by the PHY
FW.
Fixed a bug in the 40G check to only look for the bit setting and
not the actual value.
Also, check the forced speeds first before trying to enforce the
auto speeds

Allow the user to set autoneg speed in all cases except for PAM4 200G
as PAM4 200G will come up only in forced mode.

Fixes: c23f9ded0391 ("net/bnxt: support 200G PAM4 link")

Signed-off-by: Somnath Kotur <somnath.kotur at broadcom.com>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil at broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde at broadcom.com>
---
 drivers/net/bnxt/bnxt_hwrm.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/net/bnxt/bnxt_hwrm.c b/drivers/net/bnxt/bnxt_hwrm.c
index 206ac20..9c52573 100644
--- a/drivers/net/bnxt/bnxt_hwrm.c
+++ b/drivers/net/bnxt/bnxt_hwrm.c
@@ -3235,9 +3235,11 @@ int bnxt_set_hwrm_link_config(struct bnxt *bp, bool link_up)
 	if (!link_up)
 		goto port_phy_cfg;
 
+	/* Get user requested autoneg setting */
 	autoneg = bnxt_check_eth_link_autoneg(dev_conf->link_speeds);
+
 	if (BNXT_CHIP_P5(bp) &&
-	    dev_conf->link_speeds == RTE_ETH_LINK_SPEED_40G) {
+	    dev_conf->link_speeds & RTE_ETH_LINK_SPEED_40G) {
 		/* 40G is not supported as part of media auto detect.
 		 * The speed should be forced and autoneg disabled
 		 * to configure 40G speed.
@@ -3246,11 +3248,13 @@ int bnxt_set_hwrm_link_config(struct bnxt *bp, bool link_up)
 		autoneg = 0;
 	}
 
-	/* No auto speeds and no auto_pam4_link. Disable autoneg */
-	if (bp->link_info->auto_link_speed == 0 &&
-	    bp->link_info->link_signal_mode &&
-	    bp->link_info->auto_pam4_link_speed_mask == 0)
+	/* Override based on current Autoneg setting in PHY for 200G */
+	if (autoneg == 1 && BNXT_CHIP_P5(bp) && bp->link_info->auto_mode == 0 &&
+	    bp->link_info->force_pam4_link_speed ==
+	    HWRM_PORT_PHY_CFG_INPUT_FORCE_PAM4_LINK_SPEED_200GB) {
 		autoneg = 0;
+		PMD_DRV_LOG(DEBUG, "Disabling autoneg for 200G\n");
+	}
 
 	speed = bnxt_parse_eth_link_speed(dev_conf->link_speeds,
 					  bp->link_info);
@@ -3283,14 +3287,14 @@ int bnxt_set_hwrm_link_config(struct bnxt *bp, bool link_up)
 		else if (bp->link_info->force_pam4_link_speed)
 			link_req.link_speed =
 				bp->link_info->force_pam4_link_speed;
+		else if (bp->link_info->force_link_speed)
+			link_req.link_speed = bp->link_info->force_link_speed;
 		else if (bp->link_info->auto_pam4_link_speed_mask)
 			link_req.link_speed =
 				bp->link_info->auto_pam4_link_speed_mask;
 		else if (bp->link_info->support_pam4_speeds)
 			link_req.link_speed =
 				bp->link_info->support_pam4_speeds;
-		else if (bp->link_info->force_link_speed)
-			link_req.link_speed = bp->link_info->force_link_speed;
 		else
 			link_req.link_speed = bp->link_info->auto_link_speed;
 		/* Auto PAM4 link speed is zero, but auto_link_speed is not
-- 
2.10.1