----- Original Message -----
> From: "Bart Van Assche" <Bart.VanAssche@xxxxxxxxxxx>
> To: maxg@xxxxxxxxxxxx, linux-rdma@xxxxxxxxxxxxxxx
> Cc: israelr@xxxxxxxxxxxx
> Sent: Tuesday, January 3, 2017 12:59:49 PM
> Subject: Re: [PATCHv1 1/1] IB/srp: fix invalid indirect_sg_entries parameter value
>
> On Tue, 2017-01-03 at 15:51 +0200, Max Gurtovoy wrote:
> > From: Israel Rukshin <israelr@xxxxxxxxxxxx>
> >
> > After setting indirect_sg_entries module_param to huge value (e.g 500,000),
> > srp_alloc_req_data() fails to allocate indirect descriptors for the request
> > ring (kmalloc fails). This commit enforces the maximum value of
> > indirect_sg_entries
> > to be SG_MAX_SEGMENTS as signified in module param description.
> >
> > Signed-off-by: Israel Rukshin <israelr@xxxxxxxxxxxx>
> > Signed-off-by: Max Gurtovoy <maxg@xxxxxxxxxxxx>
> > ---
> > drivers/infiniband/ulp/srp/ib_srp.c | 7 +++++++
> > 1 file changed, 7 insertions(+)
> >
> > diff --git a/drivers/infiniband/ulp/srp/ib_srp.c
> > b/drivers/infiniband/ulp/srp/ib_srp.c
> > index 0f67cf9..ccdd2c2 100644
> > --- a/drivers/infiniband/ulp/srp/ib_srp.c
> > +++ b/drivers/infiniband/ulp/srp/ib_srp.c
> > @@ -3676,6 +3676,7 @@ static struct srp_function_template
> > ib_srp_transport_functions = {
> > static int __init srp_init_module(void)
> > {
> > int ret;
> > + unsigned int max_indirect_sg_entries = SG_MAX_SEGMENTS;
> >
> > if (srp_sg_tablesize) {
> > pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
> > @@ -3699,6 +3700,12 @@ static int __init srp_init_module(void)
> > indirect_sg_entries = cmd_sg_entries;
> > }
> >
> > + if (indirect_sg_entries > max_indirect_sg_entries) {
> > + pr_warn("Clamping indirect_sg_entries to %u\n",
> > + max_indirect_sg_entries);
> > + indirect_sg_entries = max_indirect_sg_entries;
> > + }
> > +
> > srp_remove_wq = create_workqueue("srp_remove");
> > if (!srp_remove_wq) {
> > ret = -ENOMEM;
>
> Hello Max,
>
> That's a good catch, but why has the max_indirect_sg_entries variable been
> introduced? Can it be left out?
>
> Thanks,
>
> Bart.N�����r��y���b�X��ǧv�^�){.n�+����{��ٚ�{ay�ʇڙ�,j��f���h���z��w������j:+v���w�j�m��������zZ+��ݢj"��
I have never had to set mine that high even when I was testing against the DDN arrays.
I run my tests with the module parameters set this way.
options ib_srp cmd_sg_entries=255 indirect_sg_entries=2048
I thought 2048 was the max.
parm: indirect_sg_entries:Default max number of gather/scatter entries (default is 12, max is 2048) (uint)
Thanks
Laurence
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