mi: add nvme_mi_submit entry and exit weak functions

These are for the user to implement their own logging.

Signed-off-by: Tokunori Ikegami <[email protected]>

Author: ikegami-t

src/libnvme-mi.map

@@ -1,5 +1,8 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 LIBNVME_MI_UNRELEASED {
+	global:
+		nvme_mi_submit_entry;
+		nvme_mi_submit_exit;
 };
 
 LIBNVME_MI_1_12 {

src/nvme/mi.c

@@ -414,10 +414,21 @@ static int nvme_mi_verify_resp_mic(struct nvme_mi_resp *resp)
 	return resp->mic != ~crc;
 }
 
+__attribute__((weak)) void *nvme_mi_submit_entry(__u8 type, const void *hdr, size_t hdr_len,
+						 const void *data, size_t data_len) { return NULL; }
+
+__attribute__((weak)) void nvme_mi_submit_exit(__u8 type, const void *hdr, size_t hdr_len,
+					       const void *data, size_t data_len, void *user_data)
+{ }
+
 int nvme_mi_submit(nvme_mi_ep_t ep, struct nvme_mi_req *req,
 		   struct nvme_mi_resp *resp)
 {
 	int rc;
+	void *user_data;
+
+	user_data = nvme_mi_submit_entry(req->hdr->type, req->hdr, req->hdr_len, req->data,
+					 req->data_len);
 
 	if (req->hdr_len < sizeof(struct nvme_mi_msg_hdr)) {
 		errno = EINVAL;
@@ -502,6 +513,9 @@ int nvme_mi_submit(nvme_mi_ep_t ep, struct nvme_mi_req *req,
 		return -1;
 	}
 
+	nvme_mi_submit_exit(resp->hdr->type, resp->hdr, resp->hdr_len, resp->data, resp->data_len,
+			    user_data);
+
 	return 0;
 }