From bc279db48a26e52b4b604ba6085da8e6d91c4afc Mon Sep 17 00:00:00 2001
From: Changpeng Liu <changpeng.liu@intel.com>
Date: Wed, 7 Apr 2021 21:46:36 +0800
Subject: [PATCH] nvmf: add one more iov entry for unaligned first page

For NVMe PRP list command, if the first PRP entry wasn't page
aligned, the number of IOV should add one more entry.

For VFIOUSER transport, a 128KiB PRP command may use 33 entries,
so we add one more entry here to address this case.

Change-Id: I9e30b301ef3ab62d7667adf336f38be9df699929
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/7263
Community-CI: Broadcom CI
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: <dongx.yi@intel.com>
---
 include/spdk/nvmf_transport.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/spdk/nvmf_transport.h b/include/spdk/nvmf_transport.h
index 6a497c11a..f3af783fd 100644
--- a/include/spdk/nvmf_transport.h
+++ b/include/spdk/nvmf_transport.h
@@ -48,7 +48,7 @@
 #define SPDK_NVMF_MAX_SGL_ENTRIES	16
 
 /* The maximum number of buffers per request */
-#define NVMF_REQ_MAX_BUFFERS	(SPDK_NVMF_MAX_SGL_ENTRIES * 2)
+#define NVMF_REQ_MAX_BUFFERS	(SPDK_NVMF_MAX_SGL_ENTRIES * 2 + 1)
 
 /* AIO backend requires block size aligned data buffers,
  * extra 4KiB aligned data buffer should work for most devices.