bnxt_en: Implement DCBNL to support host-based DCBX.

Support only IEEE DCBX initially.  Add IEEE DCBNL ops and functions to
get and set the hardware DCBX parameters.  The DCB code is conditional on
Kconfig CONFIG_BNXT_DCB.
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/Kconfig

@@ -203,4 +203,14 @@ config BNXT_SRIOV
 	  Virtualization support in the NetXtreme-C/E products. This
 	  allows for virtual function acceleration in virtual environments.
 
+config BNXT_DCB
+	bool "Data Center Bridging (DCB) Support"
+	default n
+	depends on BNXT && DCB
+	---help---
+	  Say Y here if you want to use Data Center Bridging (DCB) in the
+	  driver.
+
+	  If unsure, say N.
+
 endif # NET_VENDOR_BROADCOM

drivers/net/ethernet/broadcom/bnxt/Makefile

 obj-$(CONFIG_BNXT) += bnxt_en.o
 
-bnxt_en-y := bnxt.o bnxt_sriov.o bnxt_ethtool.o
+bnxt_en-y := bnxt.o bnxt_sriov.o bnxt_ethtool.o bnxt_dcb.o

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -54,6 +54,7 @@
 #include "bnxt.h"
 #include "bnxt_sriov.h"
 #include "bnxt_ethtool.h"
+#include "bnxt_dcb.h"
 
 #define BNXT_TX_TIMEOUT		(5 * HZ)
 
@@ -4997,7 +4998,7 @@ static void bnxt_enable_napi(struct bnxt *bp)
 	}
 }
 
-static void bnxt_tx_disable(struct bnxt *bp)
+void bnxt_tx_disable(struct bnxt *bp)
 {
 	int i;
 	struct bnxt_tx_ring_info *txr;
@@ -5015,7 +5016,7 @@ static void bnxt_tx_disable(struct bnxt *bp)
 	netif_carrier_off(bp->dev);
 }
 
-static void bnxt_tx_enable(struct bnxt *bp)
+void bnxt_tx_enable(struct bnxt *bp)
 {
 	int i;
 	struct bnxt_tx_ring_info *txr;
@@ -6686,6 +6687,7 @@ static void bnxt_remove_one(struct pci_dev *pdev)
 
 	bnxt_hwrm_func_drv_unrgtr(bp);
 	bnxt_free_hwrm_resources(bp);
+	bnxt_dcb_free(bp);
 	pci_iounmap(pdev, bp->bar2);
 	pci_iounmap(pdev, bp->bar1);
 	pci_iounmap(pdev, bp->bar0);
@@ -6913,6 +6915,8 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	dev->min_mtu = ETH_ZLEN;
 	dev->max_mtu = 9500;
 
+	bnxt_dcb_init(bp);
+
 #ifdef CONFIG_BNXT_SRIOV
 	init_waitqueue_head(&bp->sriov_cfg_wait);
 #endif

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -1026,6 +1026,13 @@ struct bnxt {
 	struct bnxt_irq	*irq_tbl;
 	u8			mac_addr[ETH_ALEN];
 
+#ifdef CONFIG_BNXT_DCB
+	struct ieee_pfc		*ieee_pfc;
+	struct ieee_ets		*ieee_ets;
+	u8			dcbx_cap;
+	u8			default_pri;
+#endif /* CONFIG_BNXT_DCB */
+
 	u32			msg_enable;
 
 	u32			hwrm_spec_code;
@@ -1221,6 +1228,8 @@ int hwrm_send_message(struct bnxt *, void *, u32, int);
 int hwrm_send_message_silent(struct bnxt *, void *, u32, int);
 int bnxt_hwrm_set_coal(struct bnxt *);
 int bnxt_hwrm_func_qcaps(struct bnxt *);
+void bnxt_tx_disable(struct bnxt *bp);
+void bnxt_tx_enable(struct bnxt *bp);
 int bnxt_hwrm_set_pause(struct bnxt *);
 int bnxt_hwrm_set_link_setting(struct bnxt *, bool, bool);
 int bnxt_hwrm_fw_set_time(struct bnxt *);

drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.h

+/* Broadcom NetXtreme-C/E network driver.
+ *
+ * Copyright (c) 2014-2016 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ */
+
+#ifndef BNXT_DCB_H
+#define BNXT_DCB_H
+
+#include <net/dcbnl.h>
+
+struct bnxt_dcb {
+	u8			max_tc;
+	struct ieee_pfc		*ieee_pfc;
+	struct ieee_ets		*ieee_ets;
+	u8			dcbx_cap;
+	u8			default_pri;
+};
+
+struct bnxt_cos2bw_cfg {
+	u8			pad[3];
+	u8			queue_id;
+	__le32			min_bw;
+	__le32			max_bw;
+	u8			tsa;
+	u8			pri_lvl;
+	u8			bw_weight;
+	u8			unused;
+};
+
+#define BNXT_LLQ(q_profile)	\
+	((q_profile) == QUEUE_QPORTCFG_RESP_QUEUE_ID0_SERVICE_PROFILE_LOSSLESS)
+
+#define HWRM_STRUCT_DATA_SUBTYPE_HOST_OPERATIONAL	0x0300
+
+void bnxt_dcb_init(struct bnxt *bp);
+void bnxt_dcb_free(struct bnxt *bp);
+#endif