linux-kernel - Re: [PATCH v3 1/1] scsi: lpfc: Do not abuse UUID APIs and LPFC_COMPRESS_VMID

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Message-ID: <CAAmqgVMFQKg4cKbT4_pdh3TTT0_ft8adQuWMwaKA2U8GdRS2Ag@mail.gmail.com>
Date:   Fri, 18 Aug 2023 09:38:41 -0700
From:   Justin Tee <justin.tee@...adcom.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        James Smart <james.smart@...adcom.com>,
        Dick Kennedy <dick.kennedy@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>
Subject: Re: [PATCH v3 1/1] scsi: lpfc: Do not abuse UUID APIs and LPFC_COMPRESS_VMID_SIZE

Hi Andy,

Thanks!

Reviewed-by: Justin Tee <justin.tee@...adcom.com>

Regards,
Justin


On Fri, Aug 18, 2023 at 8:55 AM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> The lpfc_vmid_host_uuid is not defined as uuid_t and its usage is not
> the same as for uuid_t operations (like exporting or importing).
> Hence replace call to uuid_is_null() by respective memchr_inv() without
> abusing casting.
>
> With that, replace LPFC_COMPRESS_VMID_SIZE with plain number and
> respective sizeof() to make code robust to changes in the future,
> if any.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> v3: dropped LPFC_COMPRESS_VMID_SIZE completely at the same time
>  drivers/scsi/lpfc/lpfc.h     |  3 +--
>  drivers/scsi/lpfc/lpfc_els.c | 12 +++++++-----
>  2 files changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
> index bc1c5f6df090..af15f7a22d25 100644
> --- a/drivers/scsi/lpfc/lpfc.h
> +++ b/drivers/scsi/lpfc/lpfc.h
> @@ -309,7 +309,6 @@ struct lpfc_hba;
>  #define LPFC_VMID_TIMER   300  /* timer interval in seconds */
>
>  #define LPFC_MAX_VMID_SIZE      256
> -#define LPFC_COMPRESS_VMID_SIZE 16
>
>  union lpfc_vmid_io_tag {
>         u32 app_id;     /* App Id vmid */
> @@ -667,7 +666,7 @@ struct lpfc_vport {
>         uint32_t cfg_first_burst_size;
>         uint32_t dev_loss_tmo_changed;
>         /* VMID parameters */
> -       u8 lpfc_vmid_host_uuid[LPFC_COMPRESS_VMID_SIZE];
> +       u8 lpfc_vmid_host_uuid[16];
>         u32 max_vmid;   /* maximum VMIDs allowed per port */
>         u32 cur_vmid_cnt;       /* Current VMID count */
>  #define LPFC_MIN_VMID  4
> diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
> index b5cd6d1c0a5a..54e47f268235 100644
> --- a/drivers/scsi/lpfc/lpfc_els.c
> +++ b/drivers/scsi/lpfc/lpfc_els.c
> @@ -1331,7 +1331,8 @@ lpfc_issue_els_flogi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
>         if (phba->cfg_vmid_priority_tagging) {
>                 sp->cmn.priority_tagging = 1;
>                 /* lpfc_vmid_host_uuid is combination of wwpn and wwnn */
> -               if (uuid_is_null((uuid_t *)vport->lpfc_vmid_host_uuid)) {
> +               if (!memchr_inv(vport->lpfc_vmid_host_uuid, 0,
> +                               sizeof(vport->lpfc_vmid_host_uuid))) {
>                         memcpy(vport->lpfc_vmid_host_uuid, phba->wwpn,
>                                sizeof(phba->wwpn));
>                         memcpy(&vport->lpfc_vmid_host_uuid[8], phba->wwnn,
> @@ -12357,9 +12358,10 @@ lpfc_vmid_uvem(struct lpfc_vport *vport,
>         elsiocb->vmid_tag.vmid_context = vmid_context;
>         pcmd = (u8 *)elsiocb->cmd_dmabuf->virt;
>
> -       if (uuid_is_null((uuid_t *)vport->lpfc_vmid_host_uuid))
> +       if (!memchr_inv(vport->lpfc_vmid_host_uuid, 0,
> +                       sizeof(vport->lpfc_vmid_host_uuid)))
>                 memcpy(vport->lpfc_vmid_host_uuid, vmid->host_vmid,
> -                      LPFC_COMPRESS_VMID_SIZE);
> +                      sizeof(vport->lpfc_vmid_host_uuid));
>
>         *((u32 *)(pcmd)) = ELS_CMD_UVEM;
>         len = (u32 *)(pcmd + 4);
> @@ -12369,13 +12371,13 @@ lpfc_vmid_uvem(struct lpfc_vport *vport,
>         vem_id_desc->tag = be32_to_cpu(VEM_ID_DESC_TAG);
>         vem_id_desc->length = be32_to_cpu(LPFC_UVEM_VEM_ID_DESC_SIZE);
>         memcpy(vem_id_desc->vem_id, vport->lpfc_vmid_host_uuid,
> -              LPFC_COMPRESS_VMID_SIZE);
> +              sizeof(vem_id_desc->vem_id));
>
>         inst_desc = (struct instantiated_ve_desc *)(pcmd + 32);
>         inst_desc->tag = be32_to_cpu(INSTANTIATED_VE_DESC_TAG);
>         inst_desc->length = be32_to_cpu(LPFC_UVEM_VE_MAP_DESC_SIZE);
>         memcpy(inst_desc->global_vem_id, vmid->host_vmid,
> -              LPFC_COMPRESS_VMID_SIZE);
> +              sizeof(inst_desc->global_vem_id));
>
>         bf_set(lpfc_instantiated_nport_id, inst_desc, vport->fc_myDID);
>         bf_set(lpfc_instantiated_local_id, inst_desc,
> --
> 2.40.0.1.gaa8946217a0b
>

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