[libvirt] [PATCH] add support of iSER transport type in qemu with libiscsi

[Peter Krempa]

On Thu, Dec 14, 2017 at 18:14:36 +0800, lichstor at gmail.com wrote:
> From: zhangshengyu <zhangshengyu at fusionstack.cn>

As pointed out last time, please follow the contributor guidelines. You
did not run make syntax-check. Also the contributor guidelines state
that you should write a commit message. I asked last time for that too.

Please note that I will NOT review any other version until you follow
the contributor guidelines at:

https://libvirt.org/hacking.html

See below for reasons.

> 
> ---
>  src/conf/domain_conf.c                             | 13 ++++++++
>  src/qemu/qemu_block.c                              | 17 +++++++++-
>  src/util/virstoragefile.c                          |  3 +-
>  src/util/virstoragefile.h                          |  1 +
>  tests/qemuxml2argvdata/disk-drive-network-iser.xml | 37 ++++++++++++++++++++++
>  5 files changed, 69 insertions(+), 2 deletions(-)
>  create mode 100644 tests/qemuxml2argvdata/disk-drive-network-iser.xml
> 
> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index 66e21c4bd..bf20cfd0c 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -7201,6 +7201,9 @@ virDomainHostdevSubsysSCSIiSCSIDefParseXML(xmlNodePtr sourcenode,
>      iscsisrc->src->type = VIR_STORAGE_TYPE_NETWORK;
>      iscsisrc->src->protocol = VIR_STORAGE_NET_PROTOCOL_ISCSI;
>  
> +virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> +                           _("virDomainHostdevSubsysSCSIiSCSIDefParseXML"));
> +

Is this leftover debugging? it's certainly aligned wrongly and does not
make sense at all.

>      if (!(iscsisrc->src->path = virXMLPropString(sourcenode, "name"))) {
>          virReportError(VIR_ERR_XML_ERROR, "%s",
>                         _("missing iSCSI hostdev source path name"));
> @@ -8416,6 +8419,7 @@ virDomainDiskSourceNetworkParse(xmlNodePtr node,
>                                  unsigned int flags)
>  {
>      char *protocol = NULL;
> +    char *transport = NULL;
>      char *haveTLS = NULL;
>      char *tlsCfg = NULL;
>      int tlsCfgVal;
> @@ -8427,6 +8431,10 @@ virDomainDiskSourceNetworkParse(xmlNodePtr node,
>          goto cleanup;
>      }
>  
> +    if (!(transport = virXMLPropString(node, "transport"))) {
> +        VIR_WARN("missing network source transport type");

It will be missing for all other protocols. You can't just do that.

> +    }
> +                       
>      if ((src->protocol = virStorageNetProtocolTypeFromString(protocol)) <= 0) {
>          virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
>                         _("unknown protocol type '%s'"), protocol);
> @@ -8495,6 +8503,9 @@ virDomainDiskSourceNetworkParse(xmlNodePtr node,
>      if (virDomainStorageNetworkParseHosts(node, &src->hosts, &src->nhosts) < 0)
>          goto cleanup;
>  
> +    if(src->hosts)
> +        src->hosts->transport = virStorageNetHostTransportTypeFromString(transport);

This is plain wrong. virDomainStorageNetworkParseHosts should parse
this. 

> +
>      virStorageSourceNetworkAssignDefaultPorts(src);
>  
>      ret = 0;
> @@ -22326,6 +22337,8 @@ virDomainDiskSourceFormatNetwork(virBufferPtr attrBuf,
>  
>      VIR_FREE(path);
>  
> +    virBufferEscapeString(attrBuf, " transport='%s'", "iser");

What?!?! How is this even supposed to work? Did you even bother running
make check?!?! This breaks 9 test suites.

> +
>      if (src->haveTLS != VIR_TRISTATE_BOOL_ABSENT &&
>          !(flags & VIR_DOMAIN_DEF_FORMAT_MIGRATABLE &&
>            src->tlsFromConfig))
> diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
> index 585f0255e..dcd7c6a5e 100644
> --- a/src/qemu/qemu_block.c
> +++ b/src/qemu/qemu_block.c
> @@ -506,6 +506,20 @@ qemuBlockStorageSourceBuildJSONSocketAddress(virStorageNetHostDefPtr host,
>              goto cleanup;
>          break;
>  
> +    case VIR_STORAGE_NET_HOST_TRANS_ISER:
> +        transport = "iser";
> +        if (virAsprintf(&port, "%u", host->port) < 0)
> +            goto cleanup;
> +
> +        if (virJSONValueObjectCreate(&server,
> +                                     "s:type", transport,
> +                                     "s:host", host->name,
> +                                     "s:port", port,
> +                                     NULL) < 0)
> +            goto cleanup;
> +
> +
> +        break;

Missing line break here. Please follow the coding style in the rest of
the function.

>      case VIR_STORAGE_NET_HOST_TRANS_UNIX:
>          if (virJSONValueObjectCreate(&server,
>                                       "s:type", "unix",

[...]

> diff --git a/tests/qemuxml2argvdata/disk-drive-network-iser.xml b/tests/qemuxml2argvdata/disk-drive-network-iser.xml
> new file mode 100644
> index 000000000..b3f4f9bfb
> --- /dev/null
> +++ b/tests/qemuxml2argvdata/disk-drive-network-iser.xml

You are missing the output file and change to qemuxml2argvtest.c, thus
this is testing nothing. I also think that it will not work for most
cases unless you tweak qemuDiskSourceNeedsProps.

Also this fails to compile when the gluster driver is enabled:

storage/storage_backend_gluster.c: In function 'virStorageFileBackendGlusterInitServer':
storage/storage_backend_gluster.c:600:5: error: enumeration value 'VIR_STORAGE_NET_HOST_TRANS_ISER' not handled in switch [-Werror=switch]
     switch ((virStorageNetHostTransport) host->transport) {
     ^~~~~~

Do not send any other version until you fix the tests. You also need to
run make syntax-check and fix any problems it points out.
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