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authorSean Hefty <sean.hefty@intel.com>2011-05-23 17:52:46 -0700
committerRoland Dreier <roland@purestorage.com>2011-10-12 10:32:26 -0700
commit59991f94eb32e954aa767f659eb642461e9e8b37 (patch)
treedd107c1ce5faf54a4561b7e5349eed102741772b
parent976d167615b64e14bc1491ca51d424e2ba9a5e84 (diff)
downloadlinux-59991f94eb32e954aa767f659eb642461e9e8b37.tar.bz2
RDMA/core: Add XRC domain support
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>
-rw-r--r--drivers/infiniband/core/verbs.c26
-rw-r--r--include/rdma/ib_verbs.h22
2 files changed, 48 insertions, 0 deletions
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index af7a8b08b2e9..5e03ab78fc8e 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -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);
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 228be3e220d9..d2a5c9b991d1 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -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 */