[ofw] patch: [ibbus] Add A new function to IBAL that allows one to create a multicast group without attaching a QP to it.
Tzachi Dar
tzachid at mellanox.co.il
Tue Mar 1 08:26:06 PST 2011
Applied on 3099
Thanks
Tzachi
> -----Original Message-----
> From: Irena Gannon
> Sent: Sunday, February 27, 2011 10:03 PM
> To: Tzachi Dar; Tzachi Dar; Hefty, Sean; ofw at lists.openfabrics.org
> Subject: RE: [ofw] patch: [ibbus] Add A new function to IBAL that allows one
> to create a multicast group without attaching a QP to it.
>
> Hello,
>
> The attached patch is the following fix:
>
> [core][al] Return ib_mcast_handle_t* from al_join_mcast_common only upon
> success
>
> Index: B:/users/irena/proj1/trunk/core/al/al_mcast.c
> ===================================================================
> --- B:/users/irena/proj1/trunk/core/al/al_mcast.c (revision 7431)
> +++ B:/users/irena/proj1/trunk/core/al/al_mcast.c (revision 7432)
> @@ -113,6 +113,11 @@
>
> AL_ENTER( AL_DBG_MCAST );
>
> + if (p_h_mcast)
> + {
> + *p_h_mcast = NULL;
> + }
> +
> /* Allocate a new multicast request. */
> h_mcast = cl_zalloc( sizeof( ib_mcast_t ) );
> if( !h_mcast )
> @@ -195,6 +200,12 @@
> } while( cl_status == CL_NOT_DONE );
> CL_ASSERT( cl_status == CL_SUCCESS );
> }
> +
> + if (p_h_mcast)
> + {
> + ref_al_obj(&h_mcast->obj);
> + *p_h_mcast = h_mcast;
> + }
> }
> else
> {
> @@ -203,12 +214,6 @@
> h_mcast->obj.pfn_destroy( &h_mcast->obj, NULL );
> }
>
> - if (p_h_mcast)
> - {
> - ref_al_obj(&h_mcast->obj);
> - *p_h_mcast = h_mcast;
> - }
> -
> /*
> * Note: Don't release the reference taken in init_al_obj while we
> * have the SA req outstanding.
>
>
> -----Original Message-----
> From: ofw-bounces at lists.openfabrics.org [mailto:ofw-
> bounces at lists.openfabrics.org] On Behalf Of Tzachi Dar
> Sent: Sunday, February 20, 2011 10:57 AM
> To: Tzachi Dar; Hefty, Sean; ofw at lists.openfabrics.org
> Subject: Re: [ofw] patch: [ibbus] Add A new function to IBAL that allows one
> to create a multicast group without attaching a QP to it.
>
> Applied on 3096.
>
> Thanks
> Tzachi
>
> > -----Original Message-----
> > From: Tzachi Dar
> > Sent: Thursday, February 17, 2011 11:01 AM
> > To: Tzachi Dar; Hefty, Sean; ofw at lists.openfabrics.org
> > Subject: RE: [ofw] patch: [ibbus] Add A new function to IBAL that
> > allows one to create a multicast group without attaching a QP to it.
> >
> > Attached is the latest version of the patch.
> >
> > The mcast object is now also an out parameter (optional). One can
> > attach it to a different object or track it by some other mechanism.
> > Please note that since the ib_mcast_handle_t is a user object there is
> > no need for the kernel to keep tracking it.
> >
> > Thanks
> > Tzachi & Irena
> >
> >
> > Index: core/al/al_mcast.c
> > ===================================================================
> > --- core/al/al_mcast.c (revision 3095)
> > +++ core/al/al_mcast.c (working copy)
> > @@ -100,11 +100,11 @@
> > #endif
> >
> >
> > -
> > ib_api_status_t
> > -al_join_mcast(
> > - IN const ib_qp_handle_t h_qp,
> > - IN const ib_mcast_req_t* const p_mcast_req )
> > +al_join_mcast_common(
> > + IN const ib_qp_handle_t h_qp
> > OPTIONAL,
> > + IN const ib_mcast_req_t* const p_mcast_req,
> > + OUT ib_mcast_handle_t* p_h_mcast
> > )
> > {
> > ib_mcast_handle_t h_mcast;
> > ib_api_status_t status;
> > @@ -113,20 +113,6 @@
> >
> > AL_ENTER( AL_DBG_MCAST );
> >
> > - /*
> > - * Validate the port GUID. There is no need to validate the pkey index
> > as
> > - * the user could change it later to make it invalid. There is also no
> > - * need to perform any QP transitions as ib_init_dgrm_svc resets the QP
> > and
> > - * starts from scratch.
> > - */
> > - status = get_port_num( h_qp->obj.p_ci_ca, p_mcast_req->port_guid, NULL
> > );
> > - if( status != IB_SUCCESS )
> > - {
> > - AL_PRINT( TRACE_LEVEL_ERROR, AL_DBG_ERROR,
> > - ("get_port_num failed, status: %s\n",
> > ib_get_err_str(status)) );
> > - return status;
> > - }
> > -
> > /* Allocate a new multicast request. */
> > h_mcast = cl_zalloc( sizeof( ib_mcast_t ) );
> > if( !h_mcast )
> > @@ -183,13 +169,16 @@
> > h_mcast->port_guid = p_mcast_req->port_guid;
> >
> > /* Track the multicast with the QP instance. */
> > - status = attach_al_obj( &h_qp->obj, &h_mcast->obj );
> > - if( status != IB_SUCCESS )
> > - {
> > - h_mcast->obj.pfn_destroy( &h_mcast->obj, NULL );
> > - AL_PRINT_EXIT( TRACE_LEVEL_ERROR, AL_DBG_ERROR,
> > - ("attach_al_obj returned %s.\n", ib_get_err_str(status))
> > );
> > - return status;
> > +
> > + if (h_qp) {
> > + status = attach_al_obj( &h_qp->obj, &h_mcast->obj );
> > + if( status != IB_SUCCESS )
> > + {
> > + h_mcast->obj.pfn_destroy( &h_mcast->obj, NULL );
> > + AL_PRINT_EXIT( TRACE_LEVEL_ERROR, AL_DBG_ERROR,
> > + ("attach_al_obj returned %s.\n",
> > ib_get_err_str(status)) );
> > + return status;
> > + }
> > }
> >
> > /* Issue the MAD to the SA. */
> > @@ -214,6 +203,12 @@
> > h_mcast->obj.pfn_destroy( &h_mcast->obj, NULL );
> > }
> >
> > + if (p_h_mcast)
> > + {
> > + ref_al_obj(&h_mcast->obj);
> > + *p_h_mcast = h_mcast;
> > + }
> > +
> > /*
> > * Note: Don't release the reference taken in init_al_obj while we
> > * have the SA req outstanding.
> > @@ -224,6 +219,40 @@
> > }
> >
> >
> > +ib_api_status_t
> > +al_join_mcast_no_qp(
> > + IN const ib_mcast_req_t* const p_mcast_req,
> > + OUT ib_mcast_handle_t* p_h_mcast
> > )
> > +{
> > + return al_join_mcast_common(NULL, p_mcast_req, p_h_mcast );
> > +
> > +}
> > +
> > +ib_api_status_t
> > +al_join_mcast(
> > + IN const ib_qp_handle_t h_qp,
> > + IN const ib_mcast_req_t* const p_mcast_req,
> > + OUT ib_mcast_handle_t* p_h_mcast
> > )
> > +{
> > + ib_api_status_t status;
> > + /*
> > + * Validate the port GUID. There is no need to validate the pkey
> > +index
> > as
> > + * the user could change it later to make it invalid. There is also no
> > + * need to perform any QP transitions as ib_init_dgrm_svc resets the
> > +QP
> > and
> > + * starts from scratch.
> > + */
> > +
> > + status = get_port_num( h_qp->obj.p_ci_ca, p_mcast_req->port_guid,
> > +NULL
> > );
> > + if( status != IB_SUCCESS )
> > + {
> > + AL_PRINT( TRACE_LEVEL_ERROR, AL_DBG_ERROR,
> > + ("get_port_num failed, status: %s\n",
> > ib_get_err_str(status)) );
> > + return status;
> > + }
> > +
> > + return al_join_mcast_common(h_qp, p_mcast_req, p_h_mcast); }
> > +
> > static void
> > __destroying_mcast(
> > IN al_obj_t
> > *p_obj )
> > @@ -504,7 +533,8 @@
> > */
> > h_mcast->state = SA_REG_ACTIVE;
> > /* Attach the QP to the multicast group. */
> > - if(ib_member_get_state(mcast_rec.p_member_rec-
> > >scope_state) == IB_MC_REC_STATE_FULL_MEMBER)
> > + if(ib_member_get_state(mcast_rec.p_member_rec-
> > >scope_state) == IB_MC_REC_STATE_FULL_MEMBER &&
> > + (((ib_qp_handle_t)h_mcast->obj.p_parent_obj) !=
> > NULL))
> > {
> > status = verbs_attach_mcast(h_mcast);
> > if( status != IB_SUCCESS )
> > Index: core/al/al_mcast.h
> > ===================================================================
> > --- core/al/al_mcast.h (revision 3095)
> > +++ core/al/al_mcast.h (working copy)
> > @@ -94,9 +94,15 @@
> > ib_api_status_t
> > al_join_mcast(
> > IN const ib_qp_handle_t h_qp,
> > - IN const ib_mcast_req_t* const p_mcast_req );
> > + IN const ib_mcast_req_t* const p_mcast_req,
> > + OUT ib_mcast_handle_t* p_h_mcast
> > );
> >
> > +ib_api_status_t
> > +al_join_mcast_no_qp(
> > + IN const ib_mcast_req_t* const p_mcast_req,
> > + OUT ib_mcast_handle_t* p_h_mcast
> > );
> >
> > +
> > #if defined( CL_KERNEL )
> > /*
> > * Called by proxy to attach a QP to a multicast group.
> > @@ -109,6 +115,7 @@
> > OUT al_attach_handle_t *ph_attach,
> > IN OUT ci_umv_buf_t *p_umv_buf
> > OPTIONAL );
> >
> > +
> > #endif /* CL_KERNEL */
> >
> >
> > Index: core/al/al_qp.c
> > ===================================================================
> > --- core/al/al_qp.c (revision 3095)
> > +++ core/al/al_qp.c (working copy)
> > @@ -597,10 +597,12 @@
> > static ib_api_status_t
> > al_bad_join_mcast(
> > IN const ib_qp_handle_t h_qp,
> > - IN const ib_mcast_req_t* const p_mcast_req )
> > + IN const ib_mcast_req_t* const p_mcast_req,
> > + OUT ib_mcast_handle_t* p_h_mcast
> > )
> > {
> > UNUSED_PARAM( h_qp );
> > UNUSED_PARAM( p_mcast_req );
> > + UNUSED_PARAM( p_h_mcast );
> > return IB_INVALID_PARAMETER;
> > }
> >
> > @@ -1571,7 +1573,8 @@
> > ib_api_status_t
> > ib_join_mcast(
> > IN const ib_qp_handle_t h_qp,
> > - IN const ib_mcast_req_t* const p_mcast_req )
> > + IN const ib_mcast_req_t* const p_mcast_req,
> > + OUT ib_mcast_handle_t* p_h_mcast
> > )
> > {
> > ib_api_status_t status;
> >
> > @@ -1588,14 +1591,36 @@
> > return IB_INVALID_PARAMETER;
> > }
> >
> > - status = h_qp->pfn_join_mcast( h_qp, p_mcast_req );
> > + status = h_qp->pfn_join_mcast( h_qp, p_mcast_req, p_h_mcast );
> >
> > AL_EXIT( AL_DBG_MCAST );
> > return status;
> > }
> >
> >
> > +ib_api_status_t
> > +ib_join_mcast_no_qp(
> > + IN const ib_mcast_req_t* const p_mcast_req,
> > + OUT ib_mcast_handle_t* p_h_mcast
> > )
> > +{
> > + ib_api_status_t status;
> >
> > + AL_ENTER( AL_DBG_MCAST );
> > +
> > + if( !p_mcast_req )
> > + {
> > + AL_PRINT_EXIT( TRACE_LEVEL_ERROR, AL_DBG_ERROR,
> > ("IB_INVALID_PARAMETER\n") );
> > + return IB_INVALID_PARAMETER;
> > + }
> > +
> > + status = al_join_mcast_no_qp( p_mcast_req, p_h_mcast);
> > +
> > + AL_EXIT( AL_DBG_MCAST );
> > + return status;
> > +}
> > +
> > +
> > +
> > /*
> > * Post a work request to the send queue of the QP.
> > */
> > Index: core/al/al_qp.h
> > ===================================================================
> > --- core/al/al_qp.h (revision 3095)
> > +++ core/al/al_qp.h (working copy)
> > @@ -133,7 +133,8 @@
> > ib_api_status_t
> > (*pfn_join_mcast)(
> > IN const ib_qp_handle_t h_qp,
> > - IN const ib_mcast_req_t* const p_mcast_req
> > );
> > + IN const ib_mcast_req_t* const p_mcast_req,
> > + OUT ib_mcast_handle_t*
> > p_h_mcast );
> >
> > } ib_qp_t;
> >
> > Index: core/bus/kernel/bus_pnp.c
> > ===================================================================
> > --- core/bus/kernel/bus_pnp.c (revision 3095)
> > +++ core/bus/kernel/bus_pnp.c (working copy)
> > @@ -53,6 +53,10 @@
> > #include "iba/ib_al_ifc.h"
> > #include "iba/ib_ci_ifc.h"
> > #include "iba/ib_cm_ifc.h"
> > +#include "al_cm_cep.h"
> > +#include "al_mgr.h"
> > +#include "bus_ev_log.h"
> > +#include "al_proxy.h"
> >
> >
> > /* Interface names are generated by IoRegisterDeviceInterface. */ @@
> > -1012,6
> > +1016,7 @@
> > p_ifc->poll_cq = ib_poll_cq;
> > p_ifc->rearm_cq = ib_rearm_cq;
> > p_ifc->join_mcast = ib_join_mcast;
> > + p_ifc->join_mcast_no_qp = al_join_mcast_no_qp;
> > p_ifc->leave_mcast = ib_leave_mcast;
> > p_ifc->local_mad = ib_local_mad;
> > p_ifc->cm_listen = ib_cm_listen;
> > Index: inc/iba/ib_al.h
> > ===================================================================
> > --- inc/iba/ib_al.h (revision 3095)
> > +++ inc/iba/ib_al.h (working copy)
> > @@ -3797,14 +3797,15 @@
> > * ib_join_mcast
> > *
> > * DESCRIPTION
> > -* Attaches a queue pair to a multicast group.
> > +* Creates a multicast group and Attaches a queue pair to it.
> > *
> > * SYNOPSIS
> > */
> > AL_EXPORT ib_api_status_t AL_API
> > ib_join_mcast(
> > IN const ib_qp_handle_t h_qp,
> > - IN const ib_mcast_req_t* const p_mcast_req );
> > + IN const ib_mcast_req_t* const p_mcast_req,
> > + OUT ib_mcast_handle_t* p_h_mcast
> > );
> > /*
> > * PARAMETERS
> > * h_qp
> > @@ -3872,7 +3873,85 @@
> > * ib_leave_mcast, ib_mcast_req_t, ib_create_qp, ib_init_dgrm_svc
> > *****/
> >
> > +/****f* Access Layer/ib_join_mcast
> > +* NAME
> > +* ib_join_mcast_no_qp
> > +*
> > +* DESCRIPTION
> > +* Creates a multicast group.
> > +*
> > +* SYNOPSIS
> > +*/
> > +AL_EXPORT ib_api_status_t AL_API
> > +ib_join_mcast_no_qp(
> > + IN const ib_mcast_req_t* const p_mcast_req,
> > + OUT ib_mcast_handle_t* p_h_mcast
> > );
> > +/*
> > +* PARAMETERS
> > +*
> > +* p_mcast_req
> > +* [in] Specifies the multicast group to join.
> > +*
> > +* RETURN VALUES
> > +* IB_SUCCESS
> > +* The join multicast group request has been initiated.
> > +*
> > +* IB_INVALID_QP_HANDLE
> > +* The queue pair handle was invalid.
> > +*
> > +* IB_INVALID_PARAMETER
> > +* A reference to the multicast group request information was not
> > +* provided.
> > +*
> > +* IB_INVALID_SERVICE_TYPE
> > +* The queue pair configuration does not support this type of
> > service.
> > +*
> > +* IB_INSUFFICIENT_MEMORY
> > +* There was insufficient memory to join the multicast group.
> > +*
> > +* IB_INVALID_GUID
> > +* No port was found for the port_guid specified in the request.
> > +*
> > +* IB_INSUFFICIENT_RESOURCES
> > +* There were insufficient resources currently available on the
> > channel
> > +* adapter to perform the operation.
> > +*
> > +* IB_INVALID_PKEY
> > +* The pkey specified in the multicast join request does not match
> > the
> > +* pkey of the queue pair.
> > +*
> > +* IB_INVALID_PORT
> > +* The port GUID specified in the multicast join request does not
> > match
> > +* the port of the queue pair.
> > +*
> > +* IB_ERROR
> > +* An error occurred while performing the multicast group join
> > operation.
> > +*
> > +* IB_INSUFFICIENT_RESOURCES
> > +* There were insufficient resources currently available to complete
> > +* the request.
> > +*
> > +* IB_INSUFFICIENT_MEMORY
> > +* There was insufficient memory to complete the request.
> > +*
> > +* NOTES
> > +* This routine results in the specified queue pair joining a multicast
> > +* group. If the multicast group does not already exist, it will be
> > created
> > +* at the user's option. Information about the multicast group is returned
> > +* to the user through a callback specified through the p_mcast_req
> > +* parameter.
> > +*
> > +* If the specified queue pair is already a member of a multicast group
> > when
> > +* this call is invoked, an error will occur if there are conflicting
> > +* membership requirements. The QP is restricted to being bound to a
> > single
> > +* port_guid and using a single pkey.
> > +*
> > +* SEE ALSO
> > +* ib_leave_mcast, ib_mcast_req_t, ib_create_qp, ib_init_dgrm_svc
> > +*****/
> >
> > +
> > +
> > /****f* Access Layer/ib_leave_mcast
> > * NAME
> > * ib_leave_mcast
> > Index: inc/kernel/iba/ib_al_ifc.h
> > ===================================================================
> > --- inc/kernel/iba/ib_al_ifc.h (revision 3095)
> > +++ inc/kernel/iba/ib_al_ifc.h (working copy)
> > @@ -48,7 +48,7 @@
> > * IB resources provided by HCAs.
> > *********/
> >
> > -#define AL_INTERFACE_VERSION (13)
> > +#define AL_INTERFACE_VERSION (15)
> >
> >
> >
> > @@ -401,9 +401,15 @@
> > typedef ib_api_status_t
> > (*ib_pfn_join_mcast_t)(
> > IN const ib_qp_handle_t h_qp,
> > - IN const ib_mcast_req_t* const p_mcast_req );
> > + IN const ib_mcast_req_t* const p_mcast_req,
> > + OUT ib_mcast_handle_t* p_h_mcast
> > );
> >
> > typedef ib_api_status_t
> > +(*ib_pfn_join_mcast_no_qp_t)(
> > + IN const ib_mcast_req_t* const p_mcast_req,
> > + OUT ib_mcast_handle_t* p_h_mcast
> > );
> > +
> > +typedef ib_api_status_t
> > (*ib_pfn_leave_mcast_t)(
> > IN const ib_mcast_handle_t h_mcast,
> > IN const ib_pfn_destroy_cb_t destroy_cb );
> > @@ -702,6 +708,7 @@
> > ib_pfn_poll_cq_t poll_cq;
> > ib_pfn_rearm_cq_t rearm_cq;
> > ib_pfn_join_mcast_t join_mcast;
> > + ib_pfn_join_mcast_no_qp_t join_mcast_no_qp;
> > ib_pfn_leave_mcast_t leave_mcast;
> > ib_pfn_local_mad_t local_mad;
> > ib_pfn_cm_listen_t cm_listen;
> > Index: ulp/ipoib/kernel/ipoib_port.c
> > ===================================================================
> > --- ulp/ipoib/kernel/ipoib_port.c (revision 3095)
> > +++ ulp/ipoib/kernel/ipoib_port.c (working copy)
> > @@ -5634,7 +5634,7 @@
> > ipoib_port_ref( p_port, ref_join_bcast );
> >
> > status = p_port->p_adapter->p_ifc->join_mcast(
> > - p_port->ib_mgr.h_qp, &mcast_req );
> > + p_port->ib_mgr.h_qp, &mcast_req, NULL );
> > if( status != IB_SUCCESS )
> > {
> > ipoib_port_deref( p_port, ref_bcast_join_failed ); @@ -5695,7
> > +5695,7 @@
> > /* reference the object for the multicast join request. */
> > ipoib_port_ref( p_port, ref_join_bcast );
> >
> > - status = p_port->p_adapter->p_ifc->join_mcast( p_port->ib_mgr.h_qp,
> > &mcast_req );
> > + status = p_port->p_adapter->p_ifc->join_mcast( p_port->ib_mgr.h_qp,
> > +&mcast_req, NULL );
> > if( status != IB_SUCCESS )
> > {
> > ipoib_port_deref( p_port, ref_bcast_create_failed ); @@ -6155,7
> > +6155,7 @@
> > /* reference the object for the multicast join request. */
> > ipoib_port_ref( p_port, ref_join_mcast );
> >
> > - status = p_port->p_adapter->p_ifc->join_mcast( p_port->ib_mgr.h_qp,
> > &mcast_req );
> > + status = p_port->p_adapter->p_ifc->join_mcast( p_port->ib_mgr.h_qp,
> > +&mcast_req, NULL );
> > if( status != IB_SUCCESS )
> > {
> > ipoib_port_deref( p_port, ref_mcast_join_failed );
> > Index: ulp/ipoib_NDIS6_CM/kernel/ipoib_port.cpp
> > ===================================================================
> > --- ulp/ipoib_NDIS6_CM/kernel/ipoib_port.cpp (revision 3095)
> > +++ ulp/ipoib_NDIS6_CM/kernel/ipoib_port.cpp (working copy)
> > @@ -8327,7 +8327,7 @@
> > /* reference the object for the multicast join request. */
> > ipoib_port_ref( p_port, ref_join_bcast );
> >
> > - status = p_port->p_adapter->p_ifc->join_mcast( p_port->ib_mgr.h_qp,
> > &mcast_req );
> > + status = p_port->p_adapter->p_ifc->join_mcast( p_port->ib_mgr.h_qp,
> > +&mcast_req, NULL );
> > if( status != IB_SUCCESS )
> > {
> > ipoib_port_deref( p_port, ref_bcast_join_failed ); @@ -8388,7
> > +8388,7 @@
> > /* reference the object for the multicast join request. */
> > ipoib_port_ref( p_port, ref_join_bcast );
> >
> > - status = p_port->p_adapter->p_ifc->join_mcast( p_port->ib_mgr.h_qp,
> > &mcast_req );
> > + status = p_port->p_adapter->p_ifc->join_mcast( p_port->ib_mgr.h_qp,
> > +&mcast_req, NULL );
> > if( status != IB_SUCCESS )
> > {
> > ipoib_port_deref( p_port, ref_bcast_create_failed ); @@ -8908,7
> > +8908,7 @@
> > /* reference the object for the multicast join request. */
> > ipoib_port_ref( p_port, ref_join_mcast );
> >
> > - status = p_port->p_adapter->p_ifc->join_mcast( p_port->ib_mgr.h_qp,
> > &mcast_req );
> > + status = p_port->p_adapter->p_ifc->join_mcast( p_port->ib_mgr.h_qp,
> > +&mcast_req, NULL );
> > if( status != IB_SUCCESS )
> > {
> > ipoib_port_deref( p_port, ref_mcast_join_failed );
> >
> > > -----Original Message-----
> > > From: ofw-bounces at lists.openfabrics.org [mailto:ofw-
> > > bounces at lists.openfabrics.org] On Behalf Of Tzachi Dar
> > > Sent: Tuesday, February 15, 2011 11:45 PM
> > > To: Hefty, Sean; ofw at lists.openfabrics.org
> > > Subject: Re: [ofw] patch: [ibbus] Add A new function to IBAL that
> > > allows one to create a multicast group without attaching a QP to it.
> > >
> > > Hi Sean,
> > >
> > > I now see why you need the h_mcast as an output parameter. We will
> > > add this to the function, but I don't think we will add the cancel
> > > multicast on the first stage.
> > >
> > > We will also see how we can track the user objects from the kernel.
> > >
> > > Thanks
> > > Tzachi
> > >
> > > ________________________________________
> > > From: Hefty, Sean [sean.hefty at intel.com]
> > > Sent: Tuesday, February 15, 2011 8:07 PM
> > > To: Tzachi Dar; ofw at lists.openfabrics.org
> > > Subject: RE: [ofw] patch: [ibbus] Add A new function to IBAL that
> > > allows one to create a multicast group without attaching a QP to it.
> > >
> > > > 1) On ib_join_mcast( ..., ib_mcast_handle_t *h_mcast); the
> > > > h_mcast gets back to the user from the call back.
> > > > I guess that there is no problem to return the h_mcast in the call
> > > > itself but are we sure this has a good reason?
> > >
> > > This allows the user to cancel the join operation without destroying
> > > everything by closing their al instance. For example, after issuing
> > > a join, they can immediately respond to an SM change, reregister, or
> > > other event by freeing the join and issuing a new one. Without
> > > this, handling those events becomes more difficult.
> > >
> > > Hmm... on the Linux side, the multicast module reports those types
> > > of events against the join request. The user can receive multiple
> > > (serialized) callbacks for a single join call. How does ibal handle
> > > errors on a multicast group after a successful join?
> > >
> > >
> > > > 2) " Personally, I'm fine requiring the caller to handle the
> > > > cleanup (provided the kernel cleans up after user space)."
> > > > Doesn't this has an influence on the API which would actually
> > > > force us to have something else in the API (for example h_al) or
> > > > something
> > similar.
> > >
> > > Not necessarily. The user to kernel proxy code needs to associate
> > > the h_mcast with another object, such as the file, but that doesn't
> > > have to be in the kernel API. The proxy code must free the
> > > multicast object when the file is closed. You can look at the
> > > winverbs kernel cleanup
> > code as an example.
> > >
> > > - Sean
> > > _______________________________________________
> > > ofw mailing list
> > > ofw at lists.openfabrics.org
> > > http://lists.openfabrics.org/cgi-bin/mailman/listinfo/ofw
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