Lustre discuss - Feb 2007 - Lustre wire protocol - portal_index field

Hi,

Lustre protocol uses 4 portals header type :
    - LNET_MSG_PUT
    - LNET_MSG_GET
    - LNET_MSG_REPLY
    - LNET_MSG_ACK

The two first contains a portal_index field (4 bytes).

Does someone know which portal types are for LNET_MSG_PUT and which are 
for LNET_MSG_GET:
             
.../lustre_idl.h

#define CONNMGR_REQUEST_PORTAL          1
#define CONNMGR_REPLY_PORTAL            2
//#define OSC_REQUEST_PORTAL            3
#define OSC_REPLY_PORTAL                4
//#define OSC_BULK_PORTAL               5
#define OST_IO_PORTAL                   6
#define OST_CREATE_PORTAL               7
#define OST_BULK_PORTAL                 8
//#define MDC_REQUEST_PORTAL            9
#define MDC_REPLY_PORTAL               10
//#define MDC_BULK_PORTAL              11
#define MDS_REQUEST_PORTAL             12
//#define MDS_REPLY_PORTAL             13
#define MDS_BULK_PORTAL                14
#define LDLM_CB_REQUEST_PORTAL         15
#define LDLM_CB_REPLY_PORTAL           16
#define LDLM_CANCEL_REQUEST_PORTAL     17
#define LDLM_CANCEL_REPLY_PORTAL       18
//#define PTLBD_REQUEST_PORTAL           19
//#define PTLBD_REPLY_PORTAL             20
//#define PTLBD_BULK_PORTAL              21
#define MDS_SETATTR_PORTAL             22
#define MDS_READPAGE_PORTAL            23
#define OST_REQUEST_PORTAL             28

....

or if both portal_index fields are the same ?

Regards,

T.Donadini

> Lustre protocol uses 4 portals header type :
>     - LNET_MSG_PUT
>     - LNET_MSG_GET
>     - LNET_MSG_REPLY
>     - LNET_MSG_ACK
> 
> The two first contains a portal_index field (4 bytes).
> 
> Does someone know which portal types are for LNET_MSG_PUT and 
> which are for LNET_MSG_GET:
PUT and GET messages both target ME/MDs attached to portal
''portal_index'' at the destination - i.e. your question
doesn''t make sense
at the LNET protocol level.  

However at the level of the lustre RPC, GETs are only used by servers fetching
bulk data for writes - i.e. the client has already
attached an ME/MD with unique matchbits (which it includes in the bulk RPC
request) the relevent ???_BULK_PORTAL.  In actual fact, I
think it''s only ever OST RCPs that do this currently.

                Cheers,
                        Eric

Eric Barton a ?crit :
>> Lustre protocol uses 4 portals header type :
>>     - LNET_MSG_PUT
>>     - LNET_MSG_GET
>>     - LNET_MSG_REPLY
>>     - LNET_MSG_ACK
>>
>> The two first contains a portal_index field (4 bytes).
>>
>> Does someone know which portal types are for LNET_MSG_PUT and 
>> which are for LNET_MSG_GET:
>>     
>
> PUT and GET messages both target ME/MDs attached to portal
''portal_index'' at the destination - i.e. your question
doesn''t make sense
> at the LNET protocol level.  
>
> However at the level of the lustre RPC, GETs are only used by servers
fetching bulk data for writes - i.e. the client has already
> attached an ME/MD with unique matchbits (which it includes in the bulk RPC
request) the relevent ???_BULK_PORTAL.  In actual fact, I
> think it''s only ever OST RCPs that do this currently.
>
>                 Cheers,
>                         Eric
>
>
>
>   
Ok thank you for this information, I doesn''t really know what is ME/MD 
so i will look at portals spec.

Moreover, the latest book about lustre, and more precisely for me about 
the wire protocol, is old (it wasn''t lnet yet).
Since, there have been modifications and additions (portal_types, 
structures (in lustre_idl.h), etc..) without explanations.
So it'' s a little bit hard to understand the whole protocol.

Is there a way to have information about the latest wire protocol 
modifications? (a new lustre-book or some notes for example?)

Thibault