Re: "ibstat -l" displays CA device list in an unsorted order

[Jason Gunthorpe <jgg@ziepe.ca>]

On Tue, Feb 25, 2020 at 10:25:49AM +0200, Haim Boozaglo wrote:
> 
> 
> On 2/24/2020 9:41 PM, Jason Gunthorpe wrote:
> > On Mon, Feb 24, 2020 at 08:06:56PM +0200, Haim Boozaglo wrote:
> > > Hi all,
> > > 
> > > When running "ibstat" or "ibstat -l", the output of CA device list
> > > is displayed in an unsorted order.
> > > 
> > > Before pull request #561, ibstat displayed the CA device list sorted in
> > > alphabetical order.
> > > 
> > > The problem is that users expect to have the output sorted in alphabetical
> > > order and now they get it not as expected (in an unsorted order).
> > 
> > Really? Why? That doesn't look like it should happen, the list is
> > constructed out of readdir() which should be sorted?
> > 
> > Do you know where this comes from?
> > 
> > Jason
> > 
> 
> readdir() gives us struct by struct and doesn't keep on alphabetical order.
> Before pull request #561 ibstat have used this API of libibumad:
> int umad_get_cas_names(char cas[][UMAD_CA_NAME_LEN], int max)
> 
> This API used this function:
> n = scandir(SYS_INFINIBAND, &namelist, NULL, alphasort);
> 
> scandir() can return a sorted CA device list in alphabetical order.

Oh what a weird unintended side effect.

Resolving it would require adding a sorting pass on a linked
list.. Will you try?

Jason