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>

2 files changed, 20 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/cxgb3/cxio_hal.c b/drivers/infiniband/hw/cxgb3/cxio_hal.c
index c2740e790f73..d4d7204c11ed 100644
--- a/drivers/infiniband/hw/cxgb3/cxio_hal.c
+++ b/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) {
diff --git a/drivers/infiniband/hw/cxgb3/cxio_hal.h b/drivers/infiniband/hw/cxgb3/cxio_hal.h
index 656fe47bc84f..e44dc2289471 100644
--- a/drivers/infiniband/hw/cxgb3/cxio_hal.h
+++ b/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)