On 12/26/2016 08:08 AM, Nobuo Iwata wrote:
> Implementation of new disconnect operation. This is linked as a part of
> usbip command. With this patch, usbip command has following operations.
>
> bind
> unbind
> list (local/remote)
> attach
> detach
> port
> connect ... previous patch
> disconnect ... this patch
>
> In device side node, this sends an un-export request, receives an
> un-export response and unbind corresponding device internally. The
> definition of the request and response are defined in original code:
> tools/usb/usbip/usbip_network.h but was not used. It's corresponding to
> NEW-4 in following diagram.
>
> To find disconnecting device, requesting host and requested
> bus-id-in-requester identifies the target. So it cannot to disconnect a
> device from other host than a host which connected the device.
>
> EXISTING) - invites devices from application(vhci)-side
> +------+ +------------------+
> device--+ STUB | | application/VHCI |
> +------+ +------------------+
> (server) (client)
> 1) # usbipd ... start daemon
> = = =
> 2) # usbip list --local
> 3) # usbip bind
> <--- list bound devices --- 4) # usbip list --remote
> <--- import a device ------ 5) # usbip attach
> = = =
> X disconnected 6) # usbip detach
> 7) usbip unbind
>
> NEW) - dedicates devices from device(stub)-side
> +------+ +------------------+
> device--+ STUB | | application/VHCI |
> +------+ +------------------+
> (client) (server)
> 1) # usbipa ... start daemon
> = = =
> 2) # usbip list --local
> 3) # usbip connect --- export a device ------>
> = = =
> 4) # usbip disconnect --- un-export a device --->
>
> Bind and unbind are done in connect and disconnect internally.
The same as in previous commit. Please clarify that those operations are
done only for stub driver.
(...)
> +static int disconnect_device(char *host, char *busid, int unbind)
> +{
> + int sockfd;
> + int rc;
> +
> + sockfd = usbip_net_tcp_connect(host, usbip_port_string);
> + if (sockfd < 0) {
> + err("tcp connect");
> + return -1;
> + }
> +
> + rc = unexport_device(busid, sockfd);
> + if (rc < 0) {
> + err("unexport");
> + close(sockfd);
> + return -1;
> + }
> +
> + close(sockfd);
My comment from previous version (still not fixed):
>> +
>> + rc = unexport_device(busid, sockfd);
>> + if (rc < 0) {
>> + err("unexport");
>> + close(sockfd);
>> + return -1;
>> + }
>
> close(sockfd) in case of error, otherwise close(sockfd)...
>
> Probably you can place close(sockfd) above if to avoid this weird
> copy-paste.
>
>> +
>> + close(sockfd);
>> +
> +
> + if (unbind) {
> + rc = usbip_unbind_device(busid);
> + if (rc) {
> + err("unbind");
> + return -1;
> + }
> + }
> +
> + return 0;
> +}
> +
> +int usbip_disconnect(int argc, char *argv[])
> +{
> + static const struct option opts[] = {
> + { "remote", required_argument, NULL, 'r' },
> + { "busid", required_argument, NULL, 'b' },
> + { "device", no_argument, NULL, 'd' },
> + { NULL, 0, NULL, 0 }
> + };
> + char *host = NULL;
> + char *busid = NULL;
> + int opt;
> + int unbind = 1;
Shouldn't this parameter be exposed to cmd line among remote, busid and
device? User may want to disconnect device but leave stub driver bound
to it.
> + int ret = -1;
> +
> + for (;;) {
> + opt = getopt_long(argc, argv, "r:b:d", opts, NULL);
> +
> + if (opt == -1)
> + break;
> +
> + switch (opt) {
> + case 'r':
> + host = optarg;
> + break;
> + case 'b':
> + busid = optarg;
> + break;
> + case 'd':
> + driver = &device_driver;
> + unbind = 0;
> + break;
> + default:
> + goto err_out;
> + }
> + }
> +
> + if (!host || !busid)
> + goto err_out;
> +
> + ret = disconnect_device(host, busid, unbind);
> + goto out;
> +
> +err_out:
> + usbip_disconnect_usage();
> +out:
> + return ret;
> +}
>
Best regards,
--
Krzysztof Opasiak
Samsung R&D Institute Poland
Samsung Electronics
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