My motivation was that the minimum required to get tcp via -I is creating an 
iface file that only has " iface.transport_name = tcp", which seems 
unnecessary. I'll change the patch to have the changes as requested.

> -----Original Message-----
> From: Mike Christie [mailto:[email protected]]
> Sent: Friday, July 25, 2014 10:48 AM
> To: [email protected]
> Cc: Anish Bhatt
> Subject: Re: [PATCH trivial] iscsiadm : support using -I tcp or -I iscsi_tcp
> 
> On 07/25/2014 12:26 PM, Mike Christie wrote:
> > On 07/24/2014 10:24 PM, Anish Bhatt wrote:
> >> This came up as a scripting issue, iscsiadm currently does not
> >> support specifying tcp as a "default" iface when nothing else is available.
> >> Behaves exactly as if no -I option was used.
> >>
> >> Signed-off-by: Anish Bhatt <[email protected]>
> >> ---
> >>  usr/iscsiadm.c | 4 ++++
> >>  1 file changed, 4 insertions(+)
> >>
> >> diff --git a/usr/iscsiadm.c b/usr/iscsiadm.c index 389f4b8..07cf470
> >> 100644
> >> --- a/usr/iscsiadm.c
> >> +++ b/usr/iscsiadm.c
> >> @@ -3351,6 +3351,10 @@ main(int argc, char **argv)
> >>                    ping_interval = atoi(optarg);
> >>                    break;
> >>            case 'I':
> >> +                  if (!strcmp(optarg, "tcp") ||
> >> +                      !strcmp(optarg, "iscsi_tcp"))
> >> +                          break;
> >> +
> >>                    iface = iface_alloc(optarg, &rc);
> >>                    if (rc == ISCSI_ERR_INVAL) {
> >>                            printf("Invalid iface name %s. Must be from "
> >>
> >
> > Why would you be passing in or tcp/iscsi_tcp if you did not create a
> > iface with that name?
> >
> > If you also do the above, it then works differently from if you pass
> > in "-I iser".
> 
> I do not think we can do this patch. If the user wanted to use ifaces then 
> they
> should set it up properly. If in the future they were going to set some iface
> setting, then I am not sure how this will work.
> 
> What I should have done was name the "default" iface ("-I default"
> support) to tcp like with iser. I actually did the iser support later so that 
> is why
> the naming is different. The default iface though was not really supposed to
> be used by users. It is just a dummy iface for compat.
> 
> If you can come up with a patch to rename the default iface to tcp, and can
> do it in a way where existing setups are not broken I would be happy to take
> that patch.

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