[PATCH] nvmet: fix per feat data len for get_feature

[Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>]

From: Amit Engel <amit.engel@dell.com>

From: Amit Engel <amit.engel@dell.com>

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")

Signed-off-by: Amit Engel <amit.engel@dell.com>
[chaitanya.kulkarni@wdc.com:
 1. Don't re-calculate cdw10 nvmet_get_feature(), that also fixes the
    endianness.
 3. Rename nvmet_feature_data_len() -> nvmet_feat_data_len().
 4. Get rid of the extra variable feature in nvmet_feat_data_len().
 5. Mark nvmet_feat_data_len() staic since we are the only user.
 6. Kernel patch style fixes.
]
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
---
Hi,

This patch is originally posted by Amit. I've fixed some of the issues
I found during the review, listed in the commit log.

Regards,
Chaitanya
---
 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) {
-- 
2.22.1


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