hw/nvme: save reftag when generating pi

Prepare nvme_dif_pract_generate_dif() and nvme_dif_check() to be
callable in smaller increments by making the reftag a pointer parameter
updated by the function.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/hw/nvme/nvme.h b/hw/nvme/nvme.h
index 7f3d0a181d..98a7d1c701 100644
--- a/hw/nvme/nvme.h
+++ b/hw/nvme/nvme.h
@@ -542,11 +542,11 @@ uint16_t nvme_dif_mangle_mdata(NvmeNamespace *ns, uint8_t *mbuf, size_t mlen,
                                uint64_t slba);
 void nvme_dif_pract_generate_dif(NvmeNamespace *ns, uint8_t *buf, size_t len,
                                  uint8_t *mbuf, size_t mlen, uint16_t apptag,
-                                 uint32_t reftag);
+                                 uint32_t *reftag);
 uint16_t nvme_dif_check(NvmeNamespace *ns, uint8_t *buf, size_t len,
                         uint8_t *mbuf, size_t mlen, uint16_t ctrl,
                         uint64_t slba, uint16_t apptag,
-                        uint16_t appmask, uint32_t reftag);
+                        uint16_t appmask, uint32_t *reftag);
 uint16_t nvme_dif_rw(NvmeCtrl *n, NvmeRequest *req);