RE: [PATCH v3 rdma-next 2/5] RDMA/nldev: add provider-specific resource tracking

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> 
> On Fri, Mar 30, 2018 at 11:03:36AM -0700, Steve Wise wrote:
> > diff --git a/drivers/infiniband/core/nldev.c
> b/drivers/infiniband/core/nldev.c
> > index 884843e..1a680a3 100644
> > +++ b/drivers/infiniband/core/nldev.c
> > @@ -95,8 +95,25 @@
> >  	[RDMA_NLDEV_ATTR_RES_PD_ENTRY]		= { .type =
> NLA_NESTED },
> >  	[RDMA_NLDEV_ATTR_RES_LOCAL_DMA_LKEY]	= { .type = NLA_U32 },
> >  	[RDMA_NLDEV_ATTR_RES_UNSAFE_GLOBAL_RKEY] = { .type =
> NLA_U32 },
> > +	[RDMA_NLDEV_ATTR_PROVIDER]		= { .type =
> NLA_NESTED },
> > +	[RDMA_NLDEV_ATTR_PROVIDER_ENTRY]	= { .type =
> NLA_NESTED },
> > +	[RDMA_NLDEV_ATTR_PROVIDER_STRING]	= { .type =
> NLA_NUL_STRING,
> > +				    .len = RDMA_NLDEV_ATTR_ENTRY_STRLEN
> },
> > +	[RDMA_NLDEV_ATTR_PROVIDER_PRINT_TYPE]	= { .type = NLA_U8 },
> > +	[RDMA_NLDEV_ATTR_PROVIDER_S32]		= { .type = NLA_S32 },
> > +	[RDMA_NLDEV_ATTR_PROVIDER_U32]		= { .type = NLA_U32 },
> > +	[RDMA_NLDEV_ATTR_PROVIDER_S64]		= { .type = NLA_S64 },
> > +	[RDMA_NLDEV_ATTR_PROVIDER_U64]		= { .type = NLA_U64 },
> 
> Why do we need 64 and 32 bit version of this? Pass everything as s64
> or u64?
>

To save skb space.  You and Leon both seem to like only 64b.  Guess 64b is
it then...

 
> > +static int provider_fill_res_entry(struct rdma_restrack_root *resroot,
> > +				   struct sk_buff *msg,
> > +				   struct rdma_restrack_entry *res)
> > +{
> > +	return resroot->fill_res_entry ?
> > +		resroot->fill_res_entry(msg, res) : 0;
> > +}
> 
> Just init resroot->fill_res_entry to a function that returns 0 and
> drop provider_fill_res_entry..
> 

Ok.

> > +	/*
> > +	 * provider-specific attributes.
> > +	 */
> > +	RDMA_NLDEV_ATTR_PROVIDER,		/* nested table */
> > +	RDMA_NLDEV_ATTR_PROVIDER_ENTRY,		/* nested
> table */
> > +	RDMA_NLDEV_ATTR_PROVIDER_STRING,	/* string */
> > +	RDMA_NLDEV_ATTR_PROVIDER_PRINT_TYPE,	/* u8 */
> 
> Document exactly what values PRINT_TYPE can take on, say, in an enum.

It is in an enum.  See rdma_nldev_print_type.   I'll add a comment here.

Thanks!

Steve

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