RDMA/cxgb3: Enforce required firmware

The cxgb3 NIC driver can handle more firmware versions than iw_cxgb3,
and since commit 8207befa ("cxgb3: untie strict FW matching") cxgb3
will load with firmware versions that iw_cxgb3 can't handle.  The FW
major number indicates a specific interface between the FW and
iw_cxgb3.  Thus if the major number of the running firmware does not
match the required version compiled into iw_cxgb3, then iw_cxgb3 must
not register that device.
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/cxgb3/cxio_hal.c

@@ -938,6 +938,23 @@ int cxio_rdev_open(struct cxio_rdev *rdev_p)
 	if (!rdev_p->t3cdev_p)
 		rdev_p->t3cdev_p = dev2t3cdev(netdev_p);
 	rdev_p->t3cdev_p->ulp = (void *) rdev_p;
+
+	err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, GET_EMBEDDED_INFO,
+					 &(rdev_p->fw_info));
+	if (err) {
+		printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
+		     __func__, rdev_p->t3cdev_p, err);
+		goto err1;
+	}
+	if (G_FW_VERSION_MAJOR(rdev_p->fw_info.fw_vers) != CXIO_FW_MAJ) {
+		printk(KERN_ERR MOD "fatal firmware version mismatch: "
+		       "need version %u but adapter has version %u\n",
+		       CXIO_FW_MAJ,
+		       G_FW_VERSION_MAJOR(rdev_p->fw_info.fw_vers));
+		err = -EINVAL;
+		goto err1;
+	}
+
 	err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_GET_PARAMS,
 					 &(rdev_p->rnic_info));
 	if (err) {

drivers/infiniband/hw/cxgb3/cxio_hal.h

@@ -61,6 +61,8 @@
 
 #define T3_MAX_DEV_NAME_LEN 32
 
+#define CXIO_FW_MAJ 7
+
 struct cxio_hal_ctrl_qp {
 	u32 wptr;
 	u32 rptr;
@@ -108,6 +110,7 @@ struct cxio_rdev {
 	struct gen_pool *pbl_pool;
 	struct gen_pool *rqt_pool;
 	struct list_head entry;
+	struct ch_embedded_info fw_info;
 };
 
 static inline int cxio_num_stags(struct cxio_rdev *rdev_p)