Re: [PATCH 09/16] nvme: factor out property/constraint checks

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 4/15/20 12:24 PM, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
> 
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> ---
>   hw/block/nvme.c | 52 ++++++++++++++++++++++++++++++-------------------
>   1 file changed, 32 insertions(+), 20 deletions(-)
> 
> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> index ea613213bd57..635292d6fac4 100644
> --- a/hw/block/nvme.c
> +++ b/hw/block/nvme.c
> @@ -1308,6 +1308,37 @@ static const MemoryRegionOps nvme_cmb_ops = {
>       },
>   };
>   
> +static int nvme_check_constraints(NvmeCtrl *n, Error **errp)
> +{
> +    NvmeParams *params = &n->params;
> +
> +    if (params->num_queues) {
> +        warn_report("num_queues is deprecated; please use max_ioqpairs "
> +                    "instead");
> +
> +        params->max_ioqpairs = params->num_queues - 1;
> +    }
> +
> +    if (params->max_ioqpairs < 1 ||
> +        params->max_ioqpairs > PCI_MSIX_FLAGS_QSIZE) {
> +        error_setg(errp, "max_ioqpairs must be between 1 and %d",
> +                   PCI_MSIX_FLAGS_QSIZE);
> +        return -1;
> +    }
> +
> +    if (!n->conf.blk) {
> +        error_setg(errp, "drive property not set");
> +        return -1;
> +    }
> +
> +    if (!params->serial) {
> +        error_setg(errp, "serial property not set");
> +        return -1;
> +    }
> +
> +    return 0;

Similar comment than nvme_init_blk(), I'd expect this
function to return void, and use a local_error & error_propagate() in
nvme_realize().

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

> +}
> +
>   static void nvme_realize(PCIDevice *pci_dev, Error **errp)
>   {
>       NvmeCtrl *n = NVME(pci_dev);
> @@ -1317,22 +1348,7 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
>       int64_t bs_size;
>       uint8_t *pci_conf;
>   
> -    if (n->params.num_queues) {
> -        warn_report("num_queues is deprecated; please use max_ioqpairs "
> -                    "instead");
> -
> -        n->params.max_ioqpairs = n->params.num_queues - 1;
> -    }
> -
> -    if (n->params.max_ioqpairs < 1 ||
> -        n->params.max_ioqpairs > PCI_MSIX_FLAGS_QSIZE) {
> -        error_setg(errp, "max_ioqpairs must be between 1 and %d",
> -                   PCI_MSIX_FLAGS_QSIZE);
> -        return;
> -    }
> -
> -    if (!n->conf.blk) {
> -        error_setg(errp, "drive property not set");
> +    if (nvme_check_constraints(n, errp)) {
>           return;
>       }
>   
> @@ -1342,10 +1358,6 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
>           return;
>       }
>   
> -    if (!n->params.serial) {
> -        error_setg(errp, "serial property not set");
> -        return;
> -    }
>       blkconf_blocksizes(&n->conf);
>       if (!blkconf_apply_backend_options(&n->conf, blk_is_read_only(n->conf.blk),
>                                          false, errp)) {
>