linux-kernel - Re: [PATCH v1 1/1] scsi: lpfc: Do not abuse UUID APIs

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Date:   Mon, 7 Aug 2023 10:45:03 -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 v1 1/1] scsi: lpfc: Do not abuse UUID APIs

On Mon, Aug 7, 2023 at 8:45 AM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Mon, Aug 07, 2023 at 12:58:23PM +0300, Andy Shevchenko 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.
>
> The v2 had been issued, this patch is wrong, sorry.
>
> --
> With Best Regards,
> Andy Shevchenko

Hi Andy,

Thanks I would prefer to use sizeof instead of
LPFC_COMPRESS_VMID_SIZE.  Otherwise, the change looks fine to me.

diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index b5cd6d1c0a5a..3515ec819037 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,
@@ -12357,7 +12358,8 @@ 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);

Regards,
Justin

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