From: Amit Engel <amit.engel@dell.com>
Date: Wed, 8 Jan 2020 01:47:24 +0900
Subject: [PATCH] nvmet: fix per feat data len for get_feature
Git-commit: e17016f6dcb047f91a8fc9f46bbf81a21d15ca73
Patch-mainline: v5.5-rc6
References: bsc#1169045

The existing implementation for the get_feature admin-cmd does not
use per-feature data len. This patch introduces a new helper function
nvmet_feat_data_len(), which is used to calculate per feature data len.
Right now we only set data len for fid 0x81 (NVME_FEAT_HOST_ID).

Fixes: commit e9061c397839 ("nvmet: Remove the data_len field from the nvmet_req struct")

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Amit Engel <amit.engel@dell.com>
[endiness, naming, and kernel style fixes]
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 drivers/nvme/target/admin-cmd.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 56c21b501185..72a7e41f3018 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -24,6 +24,16 @@ u32 nvmet_get_log_page_len(struct nvme_command *cmd)
 	return len;
 }
 
+static u32 nvmet_feat_data_len(struct nvmet_req *req, u32 cdw10)
+{
+	switch (cdw10 & 0xff) {
+	case NVME_FEAT_HOST_ID:
+		return sizeof(req->sq->ctrl->hostid);
+	default:
+		return 0;
+	}
+}
+
 u64 nvmet_get_log_page_offset(struct nvme_command *cmd)
 {
 	return le64_to_cpu(cmd->get_log_page.lpo);
@@ -778,7 +788,7 @@ static void nvmet_execute_get_features(struct nvmet_req *req)
 	u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10);
 	u16 status = 0;
 
-	if (!nvmet_check_data_len(req, 0))
+	if (!nvmet_check_data_len(req, nvmet_feat_data_len(req, cdw10)))
 		return;
 
 	switch (cdw10 & 0xff) {
-- 
2.16.4