On some dual port NICs, the speed setting on one port can affect the available speed on the other port. Add logic to detect these changes and adjust the advertised speed settings when necessary.

Signed-off-by Michael Chan <[email protected]>

Signed-off-by David S. Miller <[email protected]>

Signed-off-by Sasha Levin <[email protected]>

Signed-off-by Greg Kroah-Hartman <[email protected]>

---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c |   23 +++++++++++++++++++++++
 drivers/net/ethernet/broadcom/bnxt/bnxt.h |    1 +
 2 files changed, 24 insertions(+)

drivers/net/ethernet/broadcom/bnxt/bnxt.c +23 -0

@@ -1499,6 +1499,7 @@ static int bnxt_async_event_process(stru
 			netdev_warn(bp->dev, "Link speed %d no longer supported\n",
 				    speed);
 		}
+		set_bit(BNXT_LINK_SPEED_CHNG_SP_EVENT, &bp->sp_event);
 		/* fall thru */
 	}
 	case HWRM_ASYNC_EVENT_CMPL_EVENT_ID_LINK_STATUS_CHANGE:

@@ -5110,6 +5111,7 @@ static int bnxt_update_link(struct bnxt
 	struct hwrm_port_phy_qcfg_input req = {0};
 	struct hwrm_port_phy_qcfg_output *resp = bp->hwrm_cmd_resp_addr;
 	u8 link_up = link_info->link_up;
+	u16 diff;
 
 	bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_PORT_PHY_QCFG, -1, -1);

@@ -5197,6 +5199,23 @@ static int bnxt_update_link(struct bnxt
 		link_info->link_up = 0;
 	}
 	mutex_unlock(&bp->hwrm_cmd_lock);
+
+	diff = link_info->support_auto_speeds ^ link_info->advertising;
+	if ((link_info->support_auto_speeds | diff) !=
+	    link_info->support_auto_speeds) {
+		/* An advertised speed is no longer supported, so we need to
+		 * update the advertisement settings.  See bnxt_reset() for
+		 * comments about the rtnl_lock() sequence below.
+		 */
+		clear_bit(BNXT_STATE_IN_SP_TASK, &bp->state);
+		rtnl_lock();
+		link_info->advertising = link_info->support_auto_speeds;
+		if (test_bit(BNXT_STATE_OPEN, &bp->state) &&
+		    (link_info->autoneg & BNXT_AUTONEG_SPEED))
+			bnxt_hwrm_set_link_setting(bp, true, false);
+		set_bit(BNXT_STATE_IN_SP_TASK, &bp->state);
+		rtnl_unlock();
+	}
 	return 0;
 }

@@ -6126,6 +6145,10 @@ static void bnxt_sp_task(struct work_str
 	if (test_and_clear_bit(BNXT_RX_NTP_FLTR_SP_EVENT, &bp->sp_event))
 		bnxt_cfg_ntp_filters(bp);
 	if (test_and_clear_bit(BNXT_LINK_CHNG_SP_EVENT, &bp->sp_event)) {
+		if (test_and_clear_bit(BNXT_LINK_SPEED_CHNG_SP_EVENT,
+				       &bp->sp_event))
+			bnxt_hwrm_phy_qcaps(bp);
+
 		rc = bnxt_update_link(bp, true);
 		if (rc)
 			netdev_err(bp->dev, "SP task can't update link (rc: %x)\n",

drivers/net/ethernet/broadcom/bnxt/bnxt.h +1 -0

@@ -1089,6 +1089,7 @@ struct bnxt {
 #define BNXT_RESET_TASK_SILENT_SP_EVENT	11
 #define BNXT_GENEVE_ADD_PORT_SP_EVENT	12
 #define BNXT_GENEVE_DEL_PORT_SP_EVENT	13
+#define BNXT_LINK_SPEED_CHNG_SP_EVENT	14
 
 	struct bnxt_pf_info	pf;
 #ifdef CONFIG_BNXT_SRIOV

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/bnxt_en-fix-bnxt_reset-in-the-slow-path-task.patch queue-4.9/bnxt_en-enhance-autoneg-support.patch queue-4.9/bnxt_en-fix-rtnl-lock-usage-on-bnxt_update_link.patch queue-4.9/bnxt_en-fix-rtnl-lock-usage-on-bnxt_get_port_module_status.patch