[PATCH 01/10] IB: start documenting device capabilities

Christoph Hellwig
2015-12-18T13:54:57Z

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-jcswGhMUV9g@public.gmane.org>
Reviewed-by: Sagi Grimberg <sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
---
include/rdma/ib_verbs.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index a7dbbfc..db4e3fe 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -122,6 +122,14 @@ 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),
@@ -135,6 +143,16 @@ 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),
--
1.9.1