Re: [PATCH] opensm/mcast_tbl: set max_mlid_ho as actually configured mlid

Re: [PATCH] opensm/mcast_tbl: set max_mlid_ho as actually configured mlid

[Hal Rosenstock]

On Thu, Oct 29, 2009 at 3:19 PM, Sasha Khapyorsky <sashak-smomgflXvOZWk0Htik3J/w@public.gmane.org> wrote:
>
> Set switch's mcast table max_mlid_ho as actually configured mlid for the
> switch instead of a value extended to MFT block size aligned. This makes
> mlid handling checks to be more reliable.
>
> Signed-off-by: Sasha Khapyorsky <sashak-smomgflXvOZWk0Htik3J/w@public.gmane.org>
> ---
> opensm/opensm/osm_mcast_tbl.c |    5 +++--
> 1 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/opensm/opensm/osm_mcast_tbl.c b/opensm/opensm/osm_mcast_tbl.c
> index b5ae6f2..eee9290 100644
> --- a/opensm/opensm/osm_mcast_tbl.c
> +++ b/opensm/opensm/osm_mcast_tbl.c
> @@ -122,7 +122,7 @@ int osm_mcast_tbl_realloc(IN osm_mcast_tbl_t * p_tbl, IN
> uintn_t mlid_offset)
>        uint16_t (*p_mask_tbl)[][IB_MCAST_POSITION_MAX];
>
>        if (mlid_offset < p_tbl->mft_depth)
> -               return 0;
> +               goto done;

Why should max_mlid_ho be changed when < mft_depth ?

Doing so makes group removal not work properly.

-- Hal

>        /*
>           The number of bytes needed in the mask table is:
> @@ -144,7 +144,8 @@ int osm_mcast_tbl_realloc(IN osm_mcast_tbl_t * p_tbl, IN
> uintn_t mlid_offset)
>               size - p_tbl->mft_depth * (IB_MCAST_POSITION_MAX + 1) *
> IB_MCAST_MASK_SIZE / 8);
>        p_tbl->p_mask_tbl = p_mask_tbl;
>        p_tbl->mft_depth = mft_depth;
> -       p_tbl->max_mlid_ho = mft_depth + IB_LID_MCAST_START_HO - 1;
> +done:
> +       p_tbl->max_mlid_ho = mlid_offset + IB_LID_MCAST_START_HO - 1;
>        return 0;
> }
>
> --
> 1.6.5.1
>
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Re: [PATCH] opensm/mcast_tbl: set max_mlid_ho as actually configured mlid

[Sasha Khapyorsky]

On 09:48 Fri 30 Oct     , Hal Rosenstock wrote:
> >
> > diff --git a/opensm/opensm/osm_mcast_tbl.c b/opensm/opensm/osm_mcast_tbl.c
> > index b5ae6f2..eee9290 100644
> > --- a/opensm/opensm/osm_mcast_tbl.c
> > +++ b/opensm/opensm/osm_mcast_tbl.c
> > @@ -122,7 +122,7 @@ int osm_mcast_tbl_realloc(IN osm_mcast_tbl_t * p_tbl, IN
> > uintn_t mlid_offset)
> >        uint16_t (*p_mask_tbl)[][IB_MCAST_POSITION_MAX];
> >
> >        if (mlid_offset < p_tbl->mft_depth)
> > -               return 0;
> > +               goto done;
> 
> Why should max_mlid_ho be changed when < mft_depth ?

To be equal to an actually configured max mlid value (not a size of
mcast table allocation).

> Doing so makes group removal not work properly.

This may have this issue, but not due to fact of max_mlid_ho change, but
due to invalid check in osm_mcast_tbl_clear_mlid(). I think there it
should be something like:

diff --git a/opensm/opensm/osm_mcast_tbl.c b/opensm/opensm/osm_mcast_tbl.c
index 0a45904..a599e56 100644
--- a/opensm/opensm/osm_mcast_tbl.c
+++ b/opensm/opensm/osm_mcast_tbl.c
@@ -245,8 +245,8 @@ void osm_mcast_tbl_clear_mlid(IN osm_mcast_tbl_t * p_tbl, IN uint16_t mlid_ho)
 	CL_ASSERT(p_tbl);
 	CL_ASSERT(mlid_ho >= IB_LID_MCAST_START_HO);
 
-	if (p_tbl->p_mask_tbl && mlid_ho <= p_tbl->max_mlid_ho) {
-		mlid_offset = mlid_ho - IB_LID_MCAST_START_HO;
+	mlid_offset = mlid_ho - IB_LID_MCAST_START_HO;
+	if (p_tbl->p_mask_tbl && mlid_offset < p_tbl->mft_depth) {
 		for (i = 0; i <= p_tbl->max_position; i++)
 			(*p_tbl->p_mask_tbl)[mlid_offset][i] = 0;
 	}

Does it make sense?

Sasha
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Re: [PATCH] opensm/mcast_tbl: set max_mlid_ho as actually configured mlid

[Hal Rosenstock]

On Fri, Oct 30, 2009 at 4:06 PM, Sasha Khapyorsky <sashak-smomgflXvOZWk0Htik3J/w@public.gmane.org> wrote:
> On 09:48 Fri 30 Oct     , Hal Rosenstock wrote:
>> >
>> > diff --git a/opensm/opensm/osm_mcast_tbl.c b/opensm/opensm/osm_mcast_tbl.c
>> > index b5ae6f2..eee9290 100644
>> > --- a/opensm/opensm/osm_mcast_tbl.c
>> > +++ b/opensm/opensm/osm_mcast_tbl.c
>> > @@ -122,7 +122,7 @@ int osm_mcast_tbl_realloc(IN osm_mcast_tbl_t * p_tbl, IN
>> > uintn_t mlid_offset)
>> >        uint16_t (*p_mask_tbl)[][IB_MCAST_POSITION_MAX];
>> >
>> >        if (mlid_offset < p_tbl->mft_depth)
>> > -               return 0;
>> > +               goto done;
>>
>> Why should max_mlid_ho be changed when < mft_depth ?
>
> To be equal to an actually configured max mlid value (not a size of
> mcast table allocation).
>
>> Doing so makes group removal not work properly.
>
> This may have this issue, but not due to fact of max_mlid_ho change, but
> due to invalid check in osm_mcast_tbl_clear_mlid(). I think there it
> should be something like:
>
> diff --git a/opensm/opensm/osm_mcast_tbl.c b/opensm/opensm/osm_mcast_tbl.c
> index 0a45904..a599e56 100644
> --- a/opensm/opensm/osm_mcast_tbl.c
> +++ b/opensm/opensm/osm_mcast_tbl.c
> @@ -245,8 +245,8 @@ void osm_mcast_tbl_clear_mlid(IN osm_mcast_tbl_t * p_tbl, IN uint16_t mlid_ho)
>        CL_ASSERT(p_tbl);
>        CL_ASSERT(mlid_ho >= IB_LID_MCAST_START_HO);
>
> -       if (p_tbl->p_mask_tbl && mlid_ho <= p_tbl->max_mlid_ho) {
> -               mlid_offset = mlid_ho - IB_LID_MCAST_START_HO;
> +       mlid_offset = mlid_ho - IB_LID_MCAST_START_HO;
> +       if (p_tbl->p_mask_tbl && mlid_offset < p_tbl->mft_depth) {
>                for (i = 0; i <= p_tbl->max_position; i++)
>                        (*p_tbl->p_mask_tbl)[mlid_offset][i] = 0;
>        }
>
> Does it make sense?

Yes, that fixes the removal issue.

Tested-by: Hal Rosenstock <hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

-- Hal

> Sasha
>
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Re: [PATCH] opensm/mcast_tbl: set max_mlid_ho as actually configured mlid

[Sasha Khapyorsky]

On 16:44 Fri 30 Oct     , Hal Rosenstock wrote:
> >
> > diff --git a/opensm/opensm/osm_mcast_tbl.c b/opensm/opensm/osm_mcast_tbl.c
> > index 0a45904..a599e56 100644
> > --- a/opensm/opensm/osm_mcast_tbl.c
> > +++ b/opensm/opensm/osm_mcast_tbl.c
> > @@ -245,8 +245,8 @@ void osm_mcast_tbl_clear_mlid(IN osm_mcast_tbl_t * p_tbl, IN uint16_t mlid_ho)
> >        CL_ASSERT(p_tbl);
> >        CL_ASSERT(mlid_ho >= IB_LID_MCAST_START_HO);
> >
> > -       if (p_tbl->p_mask_tbl && mlid_ho <= p_tbl->max_mlid_ho) {
> > -               mlid_offset = mlid_ho - IB_LID_MCAST_START_HO;
> > +       mlid_offset = mlid_ho - IB_LID_MCAST_START_HO;
> > +       if (p_tbl->p_mask_tbl && mlid_offset < p_tbl->mft_depth) {
> >                for (i = 0; i <= p_tbl->max_position; i++)
> >                        (*p_tbl->p_mask_tbl)[mlid_offset][i] = 0;
> >        }
> >
> > Does it make sense?
> 
> Yes, that fixes the removal issue.
> 
> Tested-by: Hal Rosenstock <hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

Thanks I will apply the patch.

Yet another (likely even more efficient) approach would be memset()ing
MFTs in realloc function above requested mlid_offset, then we will be
able to remove osm_mcast_tbl_clear_mlid() completely.

Sasha
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Re: [PATCH] opensm/mcast_tbl: set max_mlid_ho as actually configured mlid

[Hal Rosenstock]

On Fri, Oct 30, 2009 at 5:31 PM, Sasha Khapyorsky <sashak-smomgflXvOZWk0Htik3J/w@public.gmane.org> wrote:
> On 16:44 Fri 30 Oct     , Hal Rosenstock wrote:
>> >
>> > diff --git a/opensm/opensm/osm_mcast_tbl.c b/opensm/opensm/osm_mcast_tbl.c
>> > index 0a45904..a599e56 100644
>> > --- a/opensm/opensm/osm_mcast_tbl.c
>> > +++ b/opensm/opensm/osm_mcast_tbl.c
>> > @@ -245,8 +245,8 @@ void osm_mcast_tbl_clear_mlid(IN osm_mcast_tbl_t * p_tbl, IN uint16_t mlid_ho)
>> >        CL_ASSERT(p_tbl);
>> >        CL_ASSERT(mlid_ho >= IB_LID_MCAST_START_HO);
>> >
>> > -       if (p_tbl->p_mask_tbl && mlid_ho <= p_tbl->max_mlid_ho) {
>> > -               mlid_offset = mlid_ho - IB_LID_MCAST_START_HO;
>> > +       mlid_offset = mlid_ho - IB_LID_MCAST_START_HO;
>> > +       if (p_tbl->p_mask_tbl && mlid_offset < p_tbl->mft_depth) {
>> >                for (i = 0; i <= p_tbl->max_position; i++)
>> >                        (*p_tbl->p_mask_tbl)[mlid_offset][i] = 0;
>> >        }
>> >
>> > Does it make sense?
>>
>> Yes, that fixes the removal issue.
>>
>> Tested-by: Hal Rosenstock <hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>
> Thanks I will apply the patch.
>
> Yet another (likely even more efficient) approach would be memset()ing
> MFTs in realloc function above requested mlid_offset, then we will be
> able to remove osm_mcast_tbl_clear_mlid() completely.

Isn't mlid clearing done on a per mlid basis rather than based on
above some mlid (offset) ? Also and perhaps more significantly, an
mlid can be removed in the middle of a range of mlids. So I don't see
how clear_mlid can be removed.

-- Hal

>
> Sasha
>
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Re: [PATCH] opensm/mcast_tbl: set max_mlid_ho as actually configured mlid

[Sasha Khapyorsky]

On 12:18 Mon 02 Nov     , Hal Rosenstock wrote:
> >
> > Yet another (likely even more efficient) approach would be memset()ing
> > MFTs in realloc function above requested mlid_offset, then we will be
> > able to remove osm_mcast_tbl_clear_mlid() completely.
> 
> Isn't mlid clearing done on a per mlid basis rather than based on
> above some mlid (offset) ? Also and perhaps more significantly, an
> mlid can be removed in the middle of a range of mlids. So I don't see
> how clear_mlid can be removed.

Yes, correct, we cannot remove clear_mlid completely.

Sasha
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Re: [PATCH] opensm/mcast_tbl: set max_mlid_ho as actually configured mlid

[Hal Rosenstock]

On Mon, Nov 2, 2009 at 12:43 PM, Sasha Khapyorsky <sashak-smomgflXvOZWk0Htik3J/w@public.gmane.org> wrote:
> On 12:18 Mon 02 Nov     , Hal Rosenstock wrote:
>> >
>> > Yet another (likely even more efficient) approach would be memset()ing
>> > MFTs in realloc function above requested mlid_offset, then we will be
>> > able to remove osm_mcast_tbl_clear_mlid() completely.
>>
>> Isn't mlid clearing done on a per mlid basis rather than based on
>> above some mlid (offset) ? Also and perhaps more significantly, an
>> mlid can be removed in the middle of a range of mlids. So I don't see
>> how clear_mlid can be removed.
>
> Yes, correct, we cannot remove clear_mlid completely.

clear_mlid could be implemented with memset rather than loop. Is that
worthwhile ?

-- Hal

>
> Sasha
>
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Re: [PATCH] opensm/mcast_tbl: set max_mlid_ho as actually configured mlid

[Sasha Khapyorsky]

On 12:44 Mon 02 Nov     , Hal Rosenstock wrote:
> 
> clear_mlid could be implemented with memset rather than loop.

Yes, memset() would be better.

Sasha
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[PATCH] opensm/osm_mcast_tbl: fix mlid removal

[Sasha Khapyorsky]

Removed mlid can exceed a current max_mlid_ho value, so to prevent MFT
garbage above this the requested mlid should be checked against actual
MFT size.

Signed-off-by: Sasha Khapyorsky <sashak-smomgflXvOZWk0Htik3J/w@public.gmane.org>
---
 opensm/opensm/osm_mcast_tbl.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/opensm/opensm/osm_mcast_tbl.c b/opensm/opensm/osm_mcast_tbl.c
index 0a45904..8136c37 100644
--- a/opensm/opensm/osm_mcast_tbl.c
+++ b/opensm/opensm/osm_mcast_tbl.c
@@ -245,11 +245,10 @@ void osm_mcast_tbl_clear_mlid(IN osm_mcast_tbl_t * p_tbl, IN uint16_t mlid_ho)
 	CL_ASSERT(p_tbl);
 	CL_ASSERT(mlid_ho >= IB_LID_MCAST_START_HO);
 
-	if (p_tbl->p_mask_tbl && mlid_ho <= p_tbl->max_mlid_ho) {
-		mlid_offset = mlid_ho - IB_LID_MCAST_START_HO;
+	mlid_offset = mlid_ho - IB_LID_MCAST_START_HO;
+	if (p_tbl->p_mask_tbl && mlid_offset < p_tbl->mft_depth)
 		for (i = 0; i <= p_tbl->max_position; i++)
 			(*p_tbl->p_mask_tbl)[mlid_offset][i] = 0;
-	}
 }
 
 /**********************************************************************
-- 
1.6.5.1

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