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References: <20231220162658.12392-1-dwagner@suse.de>
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From: Dick Kennedy <dick.kennedy@broadcom.com>
Date: Fri, 22 Dec 2023 10:04:50 -0800
Message-ID: <CAGx+d6cGuC8S2+_ipyKMtOxNQ5a0RW_H46jrwWJjwRx5TRw-ww@mail.gmail.com>
Subject: Re: [PATCH] scsi: lpfc: use unsigned type for num_sge
To: Daniel Wagner <dwagner@suse.de>
Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, 
	James Smart <james.smart@broadcom.com>, Hannes Reinecke <hare@suse.de>
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The change is good, however, I  don't think this was really the problem.

We would  like to know if this patch really solved an issue they observed.

 A good data point to know is what adapter they're using.
 If that adapter supports hybrid sgl (i.e. phba->cfg_xpsgl), then we
 would have set the max sg_tablesize =3D LPFC_MAX_SG_TABLESIZE =3D 0xffff.

 But even then, this patch implies that dma_map_sg() returned a crazy
 huge amount with the MSB set.

On Wed, Dec 20, 2023 at 8:29=E2=80=AFAM Daniel Wagner <dwagner@suse.de> wro=
te:

> From: Hannes Reinecke <hare@suse.de>
>
> LUNs going into =E2=80=9Cfailed ready running=E2=80=9D state observed on =
>1T and on
> even numbers of size (2T, 4T, 6T, 8T and 10T). The issue occurs when
> DIF is enabled at the host.
>
> The kernel logs:
>
>   Cannot setup S/G List for HBAIO segs 1/1 SGL 512 SCSI 256: 3 0
>
> The host lpfc driver is failing to setup scatter/gather list
> (protection data) for the IO's.
>
> The return type lpfc_bg_setup_sgl()/lpfc_bg_setup_sgl_prot() causes
> the compiler to remove the most significant bit. Use an unsigned type
> instead.
>
> Signed-off-by: Hannes Reinecke <hare@suse.de>
> [dwagner: added commit message]
> Signed-off-by: Daniel Wagner <dwagner@suse.de>
> ---
>  drivers/scsi/lpfc/lpfc_scsi.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.=
c
> index d26941b131fd..bf879d81846b 100644
> --- a/drivers/scsi/lpfc/lpfc_scsi.c
> +++ b/drivers/scsi/lpfc/lpfc_scsi.c
> @@ -1918,7 +1918,7 @@ lpfc_bg_setup_bpl_prot(struct lpfc_hba *phba, struc=
t
> scsi_cmnd *sc,
>   *
>   * Returns the number of SGEs added to the SGL.
>   **/
> -static int
> +static uint32_t
>  lpfc_bg_setup_sgl(struct lpfc_hba *phba, struct scsi_cmnd *sc,
>                 struct sli4_sge *sgl, int datasegcnt,
>                 struct lpfc_io_buf *lpfc_cmd)
> @@ -1926,8 +1926,8 @@ lpfc_bg_setup_sgl(struct lpfc_hba *phba, struct
> scsi_cmnd *sc,
>         struct scatterlist *sgde =3D NULL; /* s/g data entry */
>         struct sli4_sge_diseed *diseed =3D NULL;
>         dma_addr_t physaddr;
> -       int i =3D 0, num_sge =3D 0, status;
> -       uint32_t reftag;
> +       int i =3D 0, status;
> +       uint32_t reftag, num_sge =3D 0;
>         uint8_t txop, rxop;
>  #ifdef CONFIG_SCSI_LPFC_DEBUG_FS
>         uint32_t rc;
> @@ -2099,7 +2099,7 @@ lpfc_bg_setup_sgl(struct lpfc_hba *phba, struct
> scsi_cmnd *sc,
>   *
>   * Returns the number of SGEs added to the SGL.
>   **/
> -static int
> +static uint32_t
>  lpfc_bg_setup_sgl_prot(struct lpfc_hba *phba, struct scsi_cmnd *sc,
>                 struct sli4_sge *sgl, int datacnt, int protcnt,
>                 struct lpfc_io_buf *lpfc_cmd)
> @@ -2123,8 +2123,8 @@ lpfc_bg_setup_sgl_prot(struct lpfc_hba *phba, struc=
t
> scsi_cmnd *sc,
>         uint32_t rc;
>  #endif
>         uint32_t checking =3D 1;
> -       uint32_t dma_offset =3D 0;
> -       int num_sge =3D 0, j =3D 2;
> +       uint32_t dma_offset =3D 0, num_sge =3D 0;
> +       int j =3D 2;
>         struct sli4_hybrid_sgl *sgl_xtra =3D NULL;
>
>         sgpe =3D scsi_prot_sglist(sc);
> --
> 2.43.0
>
>

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<div dir=3D"ltr">The change is good, however, I=C2=A0 don&#39;t think this =
was really the problem.=C2=A0<div><br></div><div>We would=C2=A0 like to kno=
w if this patch really solved an issue they observed.<br><br>=C2=A0A good d=
ata point to know is what adapter they&#39;re using. <br>=C2=A0If that adap=
ter supports hybrid sgl (i.e. phba-&gt;cfg_xpsgl), then we<br>=C2=A0would h=
ave set the max sg_tablesize =3D LPFC_MAX_SG_TABLESIZE =3D 0xffff.<br><br>=
=C2=A0But even then, this patch implies that dma_map_sg() returned a crazy<=
br>=C2=A0huge amount with the MSB set.<br></div></div><br><div class=3D"gma=
il_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Dec 20, 2023 at 8:2=
9=E2=80=AFAM Daniel Wagner &lt;<a href=3D"mailto:dwagner@suse.de" target=3D=
"_blank">dwagner@suse.de</a>&gt; wrote:<br></div><blockquote class=3D"gmail=
_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204=
,204);padding-left:1ex">From: Hannes Reinecke &lt;<a href=3D"mailto:hare@su=
se.de" target=3D"_blank">hare@suse.de</a>&gt;<br>
<br>
LUNs going into =E2=80=9Cfailed ready running=E2=80=9D state observed on &g=
t;1T and on<br>
even numbers of size (2T, 4T, 6T, 8T and 10T). The issue occurs when<br>
DIF is enabled at the host.<br>
<br>
The kernel logs:<br>
<br>
=C2=A0 Cannot setup S/G List for HBAIO segs 1/1 SGL 512 SCSI 256: 3 0<br>
<br>
The host lpfc driver is failing to setup scatter/gather list<br>
(protection data) for the IO&#39;s.<br>
<br>
The return type lpfc_bg_setup_sgl()/lpfc_bg_setup_sgl_prot() causes<br>
the compiler to remove the most significant bit. Use an unsigned type<br>
instead.<br>
<br>
Signed-off-by: Hannes Reinecke &lt;<a href=3D"mailto:hare@suse.de" target=
=3D"_blank">hare@suse.de</a>&gt;<br>
[dwagner: added commit message]<br>
Signed-off-by: Daniel Wagner &lt;<a href=3D"mailto:dwagner@suse.de" target=
=3D"_blank">dwagner@suse.de</a>&gt;<br>
---<br>
=C2=A0drivers/scsi/lpfc/lpfc_scsi.c | 12 ++++++------<br>
=C2=A01 file changed, 6 insertions(+), 6 deletions(-)<br>
<br>
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c<=
br>
index d26941b131fd..bf879d81846b 100644<br>
--- a/drivers/scsi/lpfc/lpfc_scsi.c<br>
+++ b/drivers/scsi/lpfc/lpfc_scsi.c<br>
@@ -1918,7 +1918,7 @@ lpfc_bg_setup_bpl_prot(struct lpfc_hba *phba, struct =
scsi_cmnd *sc,<br>
=C2=A0 *<br>
=C2=A0 * Returns the number of SGEs added to the SGL.<br>
=C2=A0 **/<br>
-static int<br>
+static uint32_t<br>
=C2=A0lpfc_bg_setup_sgl(struct lpfc_hba *phba, struct scsi_cmnd *sc,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 struct sli4_sge *sg=
l, int datasegcnt,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 struct lpfc_io_buf =
*lpfc_cmd)<br>
@@ -1926,8 +1926,8 @@ lpfc_bg_setup_sgl(struct lpfc_hba *phba, struct scsi_=
cmnd *sc,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 struct scatterlist *sgde =3D NULL; /* s/g data =
entry */<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 struct sli4_sge_diseed *diseed =3D NULL;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 dma_addr_t physaddr;<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0int i =3D 0, num_sge =3D 0, status;<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0uint32_t reftag;<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0int i =3D 0, status;<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0uint32_t reftag, num_sge =3D 0;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 uint8_t txop, rxop;<br>
=C2=A0#ifdef CONFIG_SCSI_LPFC_DEBUG_FS<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 uint32_t rc;<br>
@@ -2099,7 +2099,7 @@ lpfc_bg_setup_sgl(struct lpfc_hba *phba, struct scsi_=
cmnd *sc,<br>
=C2=A0 *<br>
=C2=A0 * Returns the number of SGEs added to the SGL.<br>
=C2=A0 **/<br>
-static int<br>
+static uint32_t<br>
=C2=A0lpfc_bg_setup_sgl_prot(struct lpfc_hba *phba, struct scsi_cmnd *sc,<b=
r>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 struct sli4_sge *sg=
l, int datacnt, int protcnt,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 struct lpfc_io_buf =
*lpfc_cmd)<br>
@@ -2123,8 +2123,8 @@ lpfc_bg_setup_sgl_prot(struct lpfc_hba *phba, struct =
scsi_cmnd *sc,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 uint32_t rc;<br>
=C2=A0#endif<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 uint32_t checking =3D 1;<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0uint32_t dma_offset =3D 0;<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0int num_sge =3D 0, j =3D 2;<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0uint32_t dma_offset =3D 0, num_sge =3D 0;<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0int j =3D 2;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 struct sli4_hybrid_sgl *sgl_xtra =3D NULL;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 sgpe =3D scsi_prot_sglist(sc);<br>
-- <br>
2.43.0<br>
<br>
</blockquote></div>

<br>
<span style=3D"background-color:rgb(255,255,255)"><font size=3D"2">This ele=
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ion that is confidential, legally privileged, protected by privacy laws, or=
 otherwise restricted from disclosure to anyone else. If you are not the in=
tended recipient or the person responsible for delivering the e-mail to the=
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