Re: [PATCH nfs-utils v2 4/4] rpcctl: Add support for `rpcctl switch add-xprt`

Steve Dickson
2025-02-07T11:08:16Z

Hey Anna!

On 2/6/25 4:44 PM, Anna Schumaker wrote:
> Hi Steve,
>
> On 2/5/25 5:23 PM, Steve Dickson wrote:
>>
>>
>> On 1/27/25 4:50 PM, Anna Schumaker wrote:
>>> From: Anna Schumaker <anna.schumaker@oracle.com>
>>>
>>> This is used to add an xprt to the switch at runtime.
>>>
>>> Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
>>> ---
>>>   tools/rpcctl/rpcctl.man |  4 ++++
>>>   tools/rpcctl/rpcctl.py  | 11 +++++++++++
>>>   2 files changed, 15 insertions(+)
>>>
>>> diff --git a/tools/rpcctl/rpcctl.man b/tools/rpcctl/rpcctl.man
>>> index b87ba0df41c0..2ee168c8f3c5 100644
>>> --- a/tools/rpcctl/rpcctl.man
>>> +++ b/tools/rpcctl/rpcctl.man
>>> @@ -12,6 +12,7 @@ rpcctl \- Displays SunRPC connection information
>>>   .BR "rpcctl client show " "\fR[ \fB\-h \f| \fB\-\-help \fR] [ \fIXPRT \fR]"
>>>   .P
>>>   .BR "rpcctl switch" " \fR[ \fB\-h \fR| \fB\-\-help \fR] { \fBset \fR| \fBshow \fR}"
>>> +.BR "rpcctl switch add-xprt" " \fR[ \fB\-h \fR| \fB\-\-help \fR] [ \fISWITCH \fR]"
>>>   .BR "rpcctl switch set" " \fR[ \fB\-h \fR| \fB\-\-help \fR] \fISWITCH \fBdstaddr \fINEWADDR"
>>>   .BR "rpcctl switch show" " \fR[ \fB\-h \fR| \fB\-\-help \fR] [ \fISWITCH \fR]"
>>>   .P
>>> @@ -29,6 +30,9 @@ Show detailed information about the RPC clients on this system.
>>>   If \fICLIENT \fRwas provided, then only show information about a single RPC client.
>>>   .P
>>>   .SS rpcctl switch \fR- \fBCommands operating on groups of transports
>>> +.IP "\fBadd-xprt \fISWITCH"
>>> +Add an aditional transport to the \fISWITCH\fR.
>>> +Note that the new transport will take its values from the "main" transport.
>>>   .IP "\fBset \fISWITCH \fBdstaddr \fINEWADDR"
>>>   Change the destination address of all transports in the \fISWITCH \fRto \fINEWADDR\fR.
>>>   \fINEWADDR \fRcan be an IP address, DNS name, or anything else resolvable by \fBgethostbyname\fR(3).
>>> diff --git a/tools/rpcctl/rpcctl.py b/tools/rpcctl/rpcctl.py
>>> index 130f245a64e8..29ae7d26f50e 100755
>>> --- a/tools/rpcctl/rpcctl.py
>>> +++ b/tools/rpcctl/rpcctl.py
>>> @@ -213,6 +213,12 @@ class XprtSwitch:
>>>           parser.set_defaults(func=XprtSwitch.show, switch=None)
>>>           subparser = parser.add_subparsers()
>>>   +        add = subparser.add_parser("add-xprt",
>>> +                                   help="Add an xprt to the switch")
>>> +        add.add_argument("switch", metavar="SWITCH", nargs=1,
>>> +                         help="Name of a specific xprt switch to modify")
>>> +        add.set_defaults(func=XprtSwitch.add_xprt)
>>> +
>>>           show = subparser.add_parser("show", help="Show xprt switches")
>>>           show.add_argument("switch", metavar="SWITCH", nargs='?',
>>>                             help="Name of a specific switch to show")
>>> @@ -236,6 +242,11 @@ class XprtSwitch:
>>>               return [XprtSwitch(xprt_switches / name)]
>>>           return [XprtSwitch(f) for f in sorted(xprt_switches.iterdir())]
>>>   +    def add_xprt(args):
>>> +        """Handle the `rpcctl switch add-xprt` command."""
>>> +        for switch in XprtSwitch.get_by_name(args.switch[0]):
>>> +            write_sysfs_file(switch.path / "add_xprt", "1")
>>> +
>>>       def show(args):
>>>           """Handle the `rpcctl switch show` command."""
>>>           for switch in XprtSwitch.get_by_name(args.switch):
>> Question... is this support needed by a kernel patch? if so is
>> it in a public kernel?
>
> I'm about to post v3 of the patchset adding the kernel side of this. I'm hopeful it'll go in with the next merge window.
>
So I'm assuming 'rpcctl switch add-xprt' will fail without the
kernel patch.

If that is the case... would it make sense to commit the first 3
patches and deal with this after kernel patch goes in?

steved.