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authorChristoph Hellwig <hch@lst.de>2015-12-23 19:12:45 +0100
committerDoug Ledford <dledford@redhat.com>2015-12-23 14:29:03 -0500
commitb1adc7146af54487bb2ce1cb3012e66a1bbd8e39 (patch)
tree5f4e0a36f80924d829db64fa9559b7d4bc7cd640 /include
parent432c55fff402da3ad7716485e30e8c05010cfe68 (diff)
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IB: start documenting device capabilities
Just IB_DEVICE_LOCAL_DMA_LKEY and IB_DEVICE_MEM_MGT_EXTENSIONS for now as I'm most familar with those. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagig@mellanox.com> Reviewed-By: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/rdma/ib_verbs.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 368fc22f30f1..f06ce80f12e3 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -162,6 +162,14 @@ enum ib_device_cap_flags {
IB_DEVICE_RC_RNR_NAK_GEN = (1<<12),
IB_DEVICE_SRQ_RESIZE = (1<<13),
IB_DEVICE_N_NOTIFY_CQ = (1<<14),
+
+ /*
+ * This device supports a per-device lkey or stag that can be
+ * used without performing a memory registration for the local
+ * memory. Note that ULPs should never check this flag, but
+ * instead of use the local_dma_lkey flag in the ib_pd structure,
+ * which will always contain a usable lkey.
+ */
IB_DEVICE_LOCAL_DMA_LKEY = (1<<15),
IB_DEVICE_RESERVED = (1<<16), /* old SEND_W_INV */
IB_DEVICE_MEM_WINDOW = (1<<17),
@@ -175,6 +183,16 @@ enum ib_device_cap_flags {
IB_DEVICE_UD_IP_CSUM = (1<<18),
IB_DEVICE_UD_TSO = (1<<19),
IB_DEVICE_XRC = (1<<20),
+
+ /*
+ * This device supports the IB "base memory management extension",
+ * which includes support for fast registrations (IB_WR_REG_MR,
+ * IB_WR_LOCAL_INV and IB_WR_SEND_WITH_INV verbs). This flag should
+ * also be set by any iWarp device which must support FRs to comply
+ * to the iWarp verbs spec. iWarp devices also support the
+ * IB_WR_RDMA_READ_WITH_INV verb for RDMA READs that invalidate the
+ * stag.
+ */
IB_DEVICE_MEM_MGT_EXTENSIONS = (1<<21),
IB_DEVICE_BLOCK_MULTICAST_LOOPBACK = (1<<22),
IB_DEVICE_MEM_WINDOW_TYPE_2A = (1<<23),