[v2,12/16] nvme: add namespace helpers

From: Klaus Jensen <k.jensen@samsung.com>

Introduce some small helpers to make the next patches easier on the eye.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/block/nvme.c |  3 +--
 hw/block/nvme.h | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)

On 4/15/20 3:01 PM, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
> 
> Introduce some small helpers to make the next patches easier on the eye.
> 
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> ---
>   hw/block/nvme.c |  3 +--
>   hw/block/nvme.h | 16 ++++++++++++++++
>   2 files changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> index 80da0825d295..d5244102252c 100644
> --- a/hw/block/nvme.c
> +++ b/hw/block/nvme.c
> @@ -1469,8 +1469,7 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
>           id_ns->dps = 0;
>           id_ns->lbaf[0].ds = BDRV_SECTOR_BITS;
>           id_ns->ncap  = id_ns->nuse = id_ns->nsze =
> -            cpu_to_le64(n->ns_size >>
> -                id_ns->lbaf[NVME_ID_NS_FLBAS_INDEX(ns->id_ns.flbas)].ds);
> +            cpu_to_le64(nvme_ns_nlbas(n, ns));

Thanks :)

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

>       }
>   }
>   
> diff --git a/hw/block/nvme.h b/hw/block/nvme.h
> index 7eecfd3a50f6..dd932a9e7ebc 100644
> --- a/hw/block/nvme.h
> +++ b/hw/block/nvme.h
> @@ -67,6 +67,17 @@ typedef struct NvmeNamespace {
>       NvmeIdNs        id_ns;
>   } NvmeNamespace;
>   
> +static inline NvmeLBAF *nvme_ns_lbaf(NvmeNamespace *ns)
> +{
> +    NvmeIdNs *id_ns = &ns->id_ns;
> +    return &id_ns->lbaf[NVME_ID_NS_FLBAS_INDEX(id_ns->flbas)];
> +}
> +
> +static inline uint8_t nvme_ns_lbads(NvmeNamespace *ns)
> +{
> +    return nvme_ns_lbaf(ns)->ds;
> +}
> +
>   #define TYPE_NVME "nvme"
>   #define NVME(obj) \
>           OBJECT_CHECK(NvmeCtrl, (obj), TYPE_NVME)
> @@ -101,4 +112,9 @@ typedef struct NvmeCtrl {
>       NvmeIdCtrl      id_ctrl;
>   } NvmeCtrl;
>   
> +static inline uint64_t nvme_ns_nlbas(NvmeCtrl *n, NvmeNamespace *ns)
> +{
> +    return n->ns_size >> nvme_ns_lbads(ns);
> +}
> +
>   #endif /* HW_NVME_H */
>

On Wed, 2020-04-15 at 15:01 +0200, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
> 
> Introduce some small helpers to make the next patches easier on the eye.
> 
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> ---
>  hw/block/nvme.c |  3 +--
>  hw/block/nvme.h | 16 ++++++++++++++++
>  2 files changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> index 80da0825d295..d5244102252c 100644
> --- a/hw/block/nvme.c
> +++ b/hw/block/nvme.c
> @@ -1469,8 +1469,7 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
>          id_ns->dps = 0;
>          id_ns->lbaf[0].ds = BDRV_SECTOR_BITS;
>          id_ns->ncap  = id_ns->nuse = id_ns->nsze =
> -            cpu_to_le64(n->ns_size >>
> -                id_ns->lbaf[NVME_ID_NS_FLBAS_INDEX(ns->id_ns.flbas)].ds);
> +            cpu_to_le64(nvme_ns_nlbas(n, ns));
>      }
>  }
>  
> diff --git a/hw/block/nvme.h b/hw/block/nvme.h
> index 7eecfd3a50f6..dd932a9e7ebc 100644
> --- a/hw/block/nvme.h
> +++ b/hw/block/nvme.h
> @@ -67,6 +67,17 @@ typedef struct NvmeNamespace {
>      NvmeIdNs        id_ns;
>  } NvmeNamespace;
>  
> +static inline NvmeLBAF *nvme_ns_lbaf(NvmeNamespace *ns)
> +{
> +    NvmeIdNs *id_ns = &ns->id_ns;
> +    return &id_ns->lbaf[NVME_ID_NS_FLBAS_INDEX(id_ns->flbas)];
> +}
> +
> +static inline uint8_t nvme_ns_lbads(NvmeNamespace *ns)
> +{
> +    return nvme_ns_lbaf(ns)->ds;
> +}
> +
>  #define TYPE_NVME "nvme"
>  #define NVME(obj) \
>          OBJECT_CHECK(NvmeCtrl, (obj), TYPE_NVME)
> @@ -101,4 +112,9 @@ typedef struct NvmeCtrl {
>      NvmeIdCtrl      id_ctrl;
>  } NvmeCtrl;
>  
> +static inline uint64_t nvme_ns_nlbas(NvmeCtrl *n, NvmeNamespace *ns)
> +{
> +    return n->ns_size >> nvme_ns_lbads(ns);
> +}
> +
>  #endif /* HW_NVME_H */

Nitpick: On second thought, these function names do sound quite cryptic, so maybe
at least for nvme_ns_nlbas pick something more readable? maybe nvme_ns_number_of_lbas
or something.
Or add a comment - comment always fixes these kind of issues.

But that doesn't matter much IMHO, so
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>

Best regards,
	Maxim Levitsky