net/bnxt: fix PAM4 link negotiation

In some instances link was not coming up if PAM4 signaling is enabled.
Added check to disable autoneg if FW indicates auto speeds are zero.
Use default auto speeds if PAM4 auto speeds is not set.
Added a fix for forced link setting.

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

Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>

diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c
index 0d26c9d..3115351 100644 (file)
--- a/drivers/net/bnxt/bnxt_ethdev.c
+++ b/drivers/net/bnxt/bnxt_ethdev.c
@@ -848,6 +848,10 @@ uint32_t bnxt_get_speed_capabilities(struct bnxt *bp)
        uint32_t link_speed = bp->link_info->support_speeds;
        uint32_t speed_capa = 0;
 
+       /* If PAM4 is configured, use PAM4 supported speed */
+       if (link_speed == 0 && bp->link_info->support_pam4_speeds > 0)
+               link_speed = bp->link_info->support_pam4_speeds;
+
        if (link_speed & HWRM_PORT_PHY_QCFG_OUTPUT_LINK_SPEED_100MB)
                speed_capa |= ETH_LINK_SPEED_100M;
        if (link_speed & HWRM_PORT_PHY_QCFG_OUTPUT_SUPPORT_SPEEDS_100MBHD)

diff --git a/drivers/net/bnxt/bnxt_hwrm.c b/drivers/net/bnxt/bnxt_hwrm.c
index 8470212..24c3318 100644 (file)
--- a/drivers/net/bnxt/bnxt_hwrm.c
+++ b/drivers/net/bnxt/bnxt_hwrm.c
@@ -1272,9 +1272,10 @@ static int bnxt_hwrm_port_phy_cfg(struct bnxt *bp, struct bnxt_link_info *conf)
                                HWRM_PORT_PHY_CFG_IN_EN_FORCE_PAM4_LINK_SPEED;
                                req.force_pam4_link_speed =
                                        rte_cpu_to_le_16(conf->link_speed);
-                       }
-                       req.force_link_speed =
+                       } else {
+                               req.force_link_speed =
                                        rte_cpu_to_le_16(conf->link_speed);
+                       }
                }
                /* AutoNeg - Advertise speeds specified. */
                if (conf->auto_link_speed_mask &&
@@ -1370,6 +1371,11 @@ static int bnxt_hwrm_port_phy_qcfg(struct bnxt *bp,
                    link_info->link_speed, link_info->auto_mode,
                    link_info->auto_link_speed, link_info->auto_link_speed_mask,
                    link_info->support_speeds, link_info->force_link_speed);
+       PMD_DRV_LOG(DEBUG, "Link Signal:%d,PAM::Auto:%x,Support:%x,Force:%x\n",
+                   link_info->link_signal_mode,
+                   link_info->auto_pam4_link_speeds,
+                   link_info->support_pam4_speeds,
+                   link_info->force_pam4_link_speed);
        return rc;
 }
 
@@ -3071,6 +3077,12 @@ 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_speeds == 0)
+               autoneg = 0;
+
        speed = bnxt_parse_eth_link_speed(dev_conf->link_speeds,
                                          bp->link_info->link_signal_mode);
        link_req.phy_flags = HWRM_PORT_PHY_CFG_INPUT_FLAGS_RESET_PHY;
@@ -3116,6 +3128,12 @@ int bnxt_set_hwrm_link_config(struct bnxt *bp, bool link_up)
                        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
+                * zero. Use the auto_link_speed.
+                */
+               if (bp->link_info->auto_link_speed != 0 &&
+                   bp->link_info->auto_pam4_link_speeds == 0)
+                       link_req.link_speed = bp->link_info->auto_link_speed;
        }
        link_req.duplex = bnxt_parse_eth_link_duplex(dev_conf->link_speeds);
        link_req.auto_pause = bp->link_info->auto_pause;