Re: [PATCH] librdmacm: Add command line option to specify server

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On Mon, Mar 05, 2018 at 08:55:25AM +0200, Leon Romanovsky wrote:
> On Thu, Mar 01, 2018 at 02:58:46PM +0200, Yuval Shaia wrote:
> > Add a command line option to allow selecting specific address as done in
> > rdma_client.
> >
> > Signed-off-by: Yuval Shaia <yuval.shaia@xxxxxxxxxx>
> > ---
> >  librdmacm/examples/rdma_server.c | 8 ++++++--
> >  1 file changed, 6 insertions(+), 2 deletions(-)
> >
> > diff --git a/librdmacm/examples/rdma_server.c b/librdmacm/examples/rdma_server.c
> > index bcf649fe..77c021ac 100644
> > --- a/librdmacm/examples/rdma_server.c
> > +++ b/librdmacm/examples/rdma_server.c
> > @@ -36,6 +36,7 @@
> >  #include <rdma/rdma_cma.h>
> >  #include <rdma/rdma_verbs.h>
> >
> > +static const char *server = "127.0.0.1";
> >  static const char *port = "7471";
> >
> >  static struct rdma_cm_id *listen_id, *id;
> > @@ -55,7 +56,7 @@ static int run(void)
> >  	memset(&hints, 0, sizeof hints);
> >  	hints.ai_flags = RAI_PASSIVE;
> >  	hints.ai_port_space = RDMA_PS_TCP;
> > -	ret = rdma_getaddrinfo(NULL, port, &hints, &res);
> > +	ret = rdma_getaddrinfo(server, port, &hints, &res);

Hi Leon,

> 
> In such case (server is going to be not-NULL), the AI_PASSIVE hint
> will be ignored by getaddrinfo, but don't know whenever it is safe to
> remove "hints.ai_flags = RAI_PASSIVE;" line above.
> 
> What do you think?

Just read man page and realized that you are correct, when 'node' argument
is given the AI_PASSIVE is ignored.
I am confused, why can't i have them both? i.e be *passive* side of the
connection *while* still bind to specific source address.

I tried your suggestions, first this flag is used not only in call to
getaddrinfo so not sure it is safe to remove the setting. Second, i tried
that :) and it fails in rdma_listen phase.

> 
> Thanks


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