enic: Add support for firmware management device

This patch adds support for firmware management device in enic driver.
A management device is a virtual PCIe device that firmware can present
to the host as its management endpoint. It provides the interface between
the host and adapter firmware for all management operations.
Signed-off-by: Scott Feldman <scofeldm@cisco.com>
Signed-off-by: Roopa Prabhu <roprabhu@cisco.com>
Signed-off-by: Vasanthy Kolluri <vkolluri@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/enic/vnic_dev.c

@@ -74,6 +74,7 @@ static int vnic_dev_discover_res(struct vnic_dev *vdev,
 	struct vnic_dev_bar *bar, unsigned int num_bars)
 {
 	struct vnic_resource_header __iomem *rh;
+	struct mgmt_barmap_hdr __iomem *mrh;
 	struct vnic_resource __iomem *r;
 	u8 type;
 
@@ -86,22 +87,32 @@ static int vnic_dev_discover_res(struct vnic_dev *vdev,
 	}
 
 	rh  = bar->vaddr;
+	mrh = bar->vaddr;
 	if (!rh) {
 		pr_err("vNIC BAR0 res hdr not mem-mapped\n");
 		return -EINVAL;
 	}
 
-	if (ioread32(&rh->magic) != VNIC_RES_MAGIC ||
-	    ioread32(&rh->version) != VNIC_RES_VERSION) {
+	/* Check for mgmt vnic in addition to normal vnic */
+	if ((ioread32(&rh->magic) != VNIC_RES_MAGIC) ||
+		(ioread32(&rh->version) != VNIC_RES_VERSION)) {
+		if ((ioread32(&mrh->magic) != MGMTVNIC_MAGIC) ||
+			(ioread32(&mrh->version) != MGMTVNIC_VERSION)) {
 			pr_err("vNIC BAR0 res magic/version error "
-			"exp (%lx/%lx) curr (%x/%x)\n",
+			"exp (%lx/%lx) or (%lx/%lx), curr (%x/%x)\n",
 			VNIC_RES_MAGIC, VNIC_RES_VERSION,
+			MGMTVNIC_MAGIC, MGMTVNIC_VERSION,
 			ioread32(&rh->magic), ioread32(&rh->version));
 			return -EINVAL;
 		}
+	}
 
+	if (ioread32(&mrh->magic) == MGMTVNIC_MAGIC)
+		r = (struct vnic_resource __iomem *)(mrh + 1);
+	else
 		r = (struct vnic_resource __iomem *)(rh + 1);
 
+
 	while ((type = ioread8(&r->type)) != RES_TYPE_EOL) {
 
 		u8 bar_num = ioread8(&r->bar);

drivers/net/enic/vnic_resource.h

@@ -22,6 +22,11 @@
 
 #define VNIC_RES_MAGIC		0x766E6963L	/* 'vnic' */
 #define VNIC_RES_VERSION	0x00000000L
+#define MGMTVNIC_MAGIC		0x544d474dL	/* 'MGMT' */
+#define MGMTVNIC_VERSION	0x00000000L
+
+/* The MAC address assigned to the CFG vNIC is fixed. */
+#define MGMTVNIC_MAC		{ 0x02, 0x00, 0x54, 0x4d, 0x47, 0x4d }
 
 /* vNIC resource types */
 enum vnic_res_type {
@@ -52,6 +57,14 @@ struct vnic_resource_header {
 	u32 version;
 };
 
+struct mgmt_barmap_hdr {
+	u32 magic;			/* magic number */
+	u32 version;			/* header format version */
+	u16 lif;			/* loopback lif for mgmt frames */
+	u16 pci_slot;			/* installed pci slot */
+	char serial[16];		/* card serial number */
+};
+
 struct vnic_resource {
 	u8 type;
 	u8 bar;