Re: [PATCH] RDMA/cxgb4: Fail RDMA initialization for unsupported cards.

[Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>]

Hey Roland,

Is this patch acceptable for heading upstream?

Thanks,

Steve.

On 08/01/2011 04:59 PM, Steve Wise wrote:
> 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 initializtion
> logging an info message.
>
> - Clean up properly on initialization failures.
>
> Signed-off-by: Steve Wise<swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
> ---
>
>   drivers/infiniband/hw/cxgb4/device.c |   41 +++++++++++++++++++++++++++-------
>   1 files changed, 33 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
> index 40a13cc..6d0df6e 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:
>
> --
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