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RDMA/core: Add XRC domain support

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XRC ("eXtended reliable connected") is an IB transport that provides
better scalability by allowing senders to specify which shared receive
queue (SRQ) should be used to receive a message, which essentially
allows one transport context (QP connection) to serve multiple
destinations (as long as they share an adapter, of course).

A few new concepts are introduced to support this.  This patch adds:

 - A new device capability flag, IB_DEVICE_XRC, which low-level
   drivers set to indicate that a device supports XRC.
 - A new object type, XRC domains (struct ib_xrcd), and new verbs
   ib_alloc_xrcd()/ib_dealloc_xrcd().  XRCDs are used to limit which
   XRC SRQs an incoming message can target.

This patch is derived from work by Jack Morgenstein <jackm@dev.mellanox.co.il>.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Sean Hefty 2011-05-23 17:52:46 -07:00 committed by Roland Dreier
parent 976d167615
commit 59991f94eb
2 changed files with 48 additions and 0 deletions
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26
drivers/infiniband/core/verbs.c
View File

@ -920,3 +920,29 @@ int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
return qp->device->detach_mcast(qp, gid, lid);
}
EXPORT_SYMBOL(ib_detach_mcast);
struct ib_xrcd *ib_alloc_xrcd(struct ib_device *device)
{
struct ib_xrcd *xrcd;
if (!device->alloc_xrcd)
return ERR_PTR(-ENOSYS);
xrcd = device->alloc_xrcd(device, NULL, NULL);
if (!IS_ERR(xrcd)) {
xrcd->device = device;
atomic_set(&xrcd->usecnt, 0);
}
return xrcd;
}
EXPORT_SYMBOL(ib_alloc_xrcd);
int ib_dealloc_xrcd(struct ib_xrcd *xrcd)
{
if (atomic_read(&xrcd->usecnt))
return -EBUSY;
return xrcd->device->dealloc_xrcd(xrcd);
}
EXPORT_SYMBOL(ib_dealloc_xrcd);

22
include/rdma/ib_verbs.h
View File

@ -112,6 +112,7 @@ enum ib_device_cap_flags {
*/
IB_DEVICE_UD_IP_CSUM = (1<<18),
IB_DEVICE_UD_TSO = (1<<19),
IB_DEVICE_XRC = (1<<20),
IB_DEVICE_MEM_MGT_EXTENSIONS = (1<<21),
IB_DEVICE_BLOCK_MULTICAST_LOOPBACK = (1<<22),
};
@ -858,6 +859,11 @@ struct ib_pd {
atomic_t usecnt; /* count all resources */
};
struct ib_xrcd {
struct ib_device *device;
atomic_t usecnt; /* count all resources */
};
struct ib_ah {
struct ib_device *device;
struct ib_pd *pd;
@ -1149,6 +1155,10 @@ struct ib_device {
struct ib_grh *in_grh,
struct ib_mad *in_mad,
struct ib_mad *out_mad);
struct ib_xrcd * (*alloc_xrcd)(struct ib_device *device,
struct ib_ucontext *ucontext,
struct ib_udata *udata);
int (*dealloc_xrcd)(struct ib_xrcd *xrcd);
struct ib_dma_mapping_ops *dma_ops;
@ -2060,4 +2070,16 @@ int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid);
*/
int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid);
/**
* ib_alloc_xrcd - Allocates an XRC domain.
* @device: The device on which to allocate the XRC domain.
*/
struct ib_xrcd *ib_alloc_xrcd(struct ib_device *device);
/**
* ib_dealloc_xrcd - Deallocates an XRC domain.
* @xrcd: The XRC domain to deallocate.
*/
int ib_dealloc_xrcd(struct ib_xrcd *xrcd);
#endif /* IB_VERBS_H */