RDMA/cxgb4: Fail RDMA initialization for unsupported cards

The iw_cxgb4 module crashes at init time if the T4 card does not
support RDMA.  So clean up the init logic to correctly deal with
non-RDMA cards.

 - If any RDMA resources are not available, then fail the initialization
   logging an info message.
 - Clean up properly on initialization failures.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 33 insertions, 8 deletions

diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
index 40a13cc633a3..6d0df6ec161b 100644
--- a/drivers/infiniband/hw/cxgb4/device.c
+++ b/drivers/infiniband/hw/cxgb4/device.c
@@ -376,10 +376,8 @@ struct uld_ctx {
         struct c4iw_dev *dev;
 };
 
-static void c4iw_remove(struct uld_ctx *ctx)
+static void c4iw_dealloc(struct uld_ctx *ctx)
 {
-        PDBG("%s c4iw_dev %p\n", __func__,  ctx->dev);
-        c4iw_unregister_device(ctx->dev);
         c4iw_rdev_close(&ctx->dev->rdev);
         idr_destroy(&ctx->dev->cqidr);
         idr_destroy(&ctx->dev->qpidr);
@@ -389,11 +387,30 @@ static void c4iw_remove(struct uld_ctx *ctx)
         ctx->dev = NULL;
 }
 
+static void c4iw_remove(struct uld_ctx *ctx)
+{
+        PDBG("%s c4iw_dev %p\n", __func__,  ctx->dev);
+        c4iw_unregister_device(ctx->dev);
+        c4iw_dealloc(ctx);
+}
+
+static int rdma_supported(const struct cxgb4_lld_info *infop)
+{
+        return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
+               infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
+               infop->vr->cq.size > 0 && infop->vr->ocq.size > 0;
+}
+
 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 {
         struct c4iw_dev *devp;
         int ret;
 
+        if (!rdma_supported(infop)) {
+                printk(KERN_INFO MOD "%s: RDMA not supported on this device.\n",
+                       pci_name(infop->pdev));
+                return ERR_PTR(-ENOSYS);
+        }
         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
         if (!devp) {
                 printk(KERN_ERR MOD "Cannot allocate ib device\n");
@@ -414,7 +431,6 @@ static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 
         ret = c4iw_rdev_open(&devp->rdev);
         if (ret) {
-                mutex_unlock(&dev_mutex);
                 printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
                 ib_dealloc_device(&devp->ibdev);
                 return ERR_PTR(ret);
@@ -519,15 +535,24 @@ static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
         case CXGB4_STATE_UP:
                 printk(KERN_INFO MOD "%s: Up\n", pci_name(ctx->lldi.pdev));
                 if (!ctx->dev) {
-                        int ret = 0;
+                        int ret;
 
                         ctx->dev = c4iw_alloc(&ctx->lldi);
-                        if (!IS_ERR(ctx->dev))
-                                ret = c4iw_register_device(ctx->dev);
-                        if (IS_ERR(ctx->dev) || ret)
+                        if (IS_ERR(ctx->dev)) {
+                                printk(KERN_ERR MOD
+                                       "%s: initialization failed: %ld\n",
+                                       pci_name(ctx->lldi.pdev),
+                                       PTR_ERR(ctx->dev));
+                                ctx->dev = NULL;
+                                break;
+                        }
+                        ret = c4iw_register_device(ctx->dev);
+                        if (ret) {
                                 printk(KERN_ERR MOD
                                        "%s: RDMA registration failed: %d\n",
                                        pci_name(ctx->lldi.pdev), ret);
+                                c4iw_dealloc(ctx);
+                        }
                 }
                 break;
         case CXGB4_STATE_DOWN: