Re: [PATCH v2 12/15] hw/nvme: Initialize capability structures for primary/secondary controllers

[Klaus Jensen]

On Nov 16 16:34, Łukasz Gieryk wrote:
> With four new properties:
>  - sriov_v{i,q}_flexible,
>  - sriov_max_v{i,q}_per_vf,
> one can configure the number of available flexible resources, as well as
> the limits. The primary and secondary controller capability structures
> are initialized accordingly.
> 
> Since the number of available queues (interrupts) now varies between
> VF/PF, BAR size calculation is also adjusted.
> 
> Signed-off-by: Łukasz Gieryk <lukasz.gieryk@linux.intel.com>
> ---
>  hw/nvme/ctrl.c       | 138 ++++++++++++++++++++++++++++++++++++++++---
>  hw/nvme/nvme.h       |   4 ++
>  include/block/nvme.h |   5 ++
>  3 files changed, 140 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
> index f8f5dfe204..f589ffde59 100644
> --- a/hw/nvme/ctrl.c
> +++ b/hw/nvme/ctrl.c
> @@ -6358,13 +6444,40 @@ static void nvme_init_state(NvmeCtrl *n)
>      n->starttime_ms = qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL);
>      n->aer_reqs = g_new0(NvmeRequest *, n->params.aerl + 1);
>  
> -    list->numcntl = cpu_to_le16(n->params.sriov_max_vfs);
> -    for (i = 0; i < n->params.sriov_max_vfs; i++) {
> +    list->numcntl = cpu_to_le16(max_vfs);
> +    for (i = 0; i < max_vfs; i++) {
>          sctrl = &list->sec[i];
>          sctrl->pcid = cpu_to_le16(n->cntlid);
>      }
>  
>      cap->cntlid = cpu_to_le16(n->cntlid);
> +    cap->crt = NVME_CRT_VQ | NVME_CRT_VI;
> +
> +    if (pci_is_vf(&n->parent_obj)) {
> +        cap->vqprt = cpu_to_le16(1 + n->conf_ioqpairs);
> +    } else {
> +        cap->vqprt = cpu_to_le16(1 + n->params.max_ioqpairs -
> +                                 n->params.sriov_vq_flexible);
> +        cap->vqfrt = cpu_to_le32(n->params.sriov_vq_flexible);
> +        cap->vqrfap = cap->vqfrt;
> +        cap->vqgran = cpu_to_le16(NVME_VF_RES_GRANULARITY);
> +        cap->vqfrsm = n->params.sriov_max_vq_per_vf ?
> +                        cpu_to_le16(n->params.sriov_max_vq_per_vf) :
> +                        cap->vqprt;

That this defaults to VQPRT doesn't seem right. It should default to
VQFRT. Does not make sense to report a maximum number of assignable
flexible resources that are bigger than the number of flexible resources
available.

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