From 1de99be6cfe5bd0a2f202d6885094399474d1384 Mon Sep 17 00:00:00 2001
From: Ben Walker <benjamin.walker@intel.com>
Date: Tue, 29 Jan 2019 15:15:04 -0700
Subject: [PATCH] nvme: Update p2p DMA documentation to indicate how to check
 for support

Change-Id: I8d7de13c6c4f8cfb5ffabc21aa2d793774421034
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/c/442638
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: wuzhouhui <wuzhouhui@kingsoft.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
---
 doc/peer_2_peer.md | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/doc/peer_2_peer.md b/doc/peer_2_peer.md
index ee39a4aeb..4d169bdb9 100644
--- a/doc/peer_2_peer.md
+++ b/doc/peer_2_peer.md
@@ -31,13 +31,23 @@ Key Functions                               | Description
 ------------------------------------------- | -----------
 spdk_nvme_ctrlr_alloc_cmb_io_buffer()       | @copybrief spdk_nvme_ctrlr_alloc_cmb_io_buffer()
 spdk_nvme_ctrlr_free_cmb_io_buffer()        | @copybrief spdk_nvme_ctrlr_free_cmb_io_buffer()
+spdk_nvme_ctrlr_get_regs_cmbsz()            | @copybrief spdk_nvme_ctrlr_get_regs_cmbsz()
+
+# Determining device support {#p2p_support}
+
+SPDK's identify example application displays whether a device has a controller
+memory buffer and which operations it supports. Run it as follows:
+
+~~~{.sh}
+./examples/nvme/identify/identify -r traddr:<pci id of ssd>
+~~~
 
 # cmb_copy: An example P2P Application {#p2p_cmb_copy}
 
 Run the cmb_copy example application.
 
 ~~~{.sh}
-./examples/nvme/cmb_copy -r <pci id of write ssd>-1-0-1 -w <pci id of write ssd>-1-0-1 -c <pci id of the ssd with cmb>
+./examples/nvme/cmb_copy/cmb_copy -r <pci id of write ssd>-1-0-1 -w <pci id of write ssd>-1-0-1 -c <pci id of the ssd with cmb>
 ~~~
 This should copy a single LBA (LBA 0) from namespace 1 on the read
 NVMe SSD to LBA 0 on namespace 1 on the write SSD using the CMB as the