nvme-auth: don't use NVMe status codes

NVMe status codes are part of the wire protocol, and shouldn't be
fabricated in the stack. So with this patch the authentication code
is switched over to use error codes; as a side effect authentication
failures due to internal error won't be retried anymore.
But that shouldn't have happened anyway.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/host/auth.c

@@ -158,7 +158,7 @@ static int nvme_auth_process_dhchap_challenge(struct nvme_ctrl *ctrl,
 
 	if (size > CHAP_BUF_SIZE) {
 		chap->status = NVME_AUTH_DHCHAP_FAILURE_INCORRECT_PAYLOAD;
-		return NVME_SC_INVALID_FIELD;
+		return -EINVAL;
 	}
 
 	hmac_name = nvme_auth_hmac_name(data->hashid);
@@ -167,7 +167,7 @@ static int nvme_auth_process_dhchap_challenge(struct nvme_ctrl *ctrl,
 			 "qid %d: invalid HASH ID %d\n",
 			 chap->qid, data->hashid);
 		chap->status = NVME_AUTH_DHCHAP_FAILURE_HASH_UNUSABLE;
-		return NVME_SC_INVALID_FIELD;
+		return -EPROTO;
 	}
 
 	if (chap->hash_id == data->hashid && chap->shash_tfm &&
@@ -193,7 +193,7 @@ static int nvme_auth_process_dhchap_challenge(struct nvme_ctrl *ctrl,
 			 chap->qid, hmac_name, PTR_ERR(chap->shash_tfm));
 		chap->shash_tfm = NULL;
 		chap->status = NVME_AUTH_DHCHAP_FAILURE_FAILED;
-		return NVME_SC_AUTH_REQUIRED;
+		return -ENOMEM;
 	}
 
 	if (crypto_shash_digestsize(chap->shash_tfm) != data->hl) {
@@ -203,7 +203,7 @@ static int nvme_auth_process_dhchap_challenge(struct nvme_ctrl *ctrl,
 		crypto_free_shash(chap->shash_tfm);
 		chap->shash_tfm = NULL;
 		chap->status = NVME_AUTH_DHCHAP_FAILURE_HASH_UNUSABLE;
-		return NVME_SC_AUTH_REQUIRED;
+		return -EPROTO;
 	}
 
 	chap->hash_id = data->hashid;
@@ -219,7 +219,7 @@ select_kpp:
 			 chap->qid, data->dhgid);
 		chap->status = NVME_AUTH_DHCHAP_FAILURE_DHGROUP_UNUSABLE;
 		/* Leave previous dh_tfm intact */
-		return NVME_SC_AUTH_REQUIRED;
+		return -EPROTO;
 	}
 
 	if (chap->dhgroup_id == data->dhgid &&
@@ -242,7 +242,7 @@ select_kpp:
 				 "qid %d: empty DH value\n",
 				 chap->qid);
 			chap->status = NVME_AUTH_DHCHAP_FAILURE_DHGROUP_UNUSABLE;
-			return NVME_SC_INVALID_FIELD;
+			return -EPROTO;
 		}
 
 		chap->dh_tfm = crypto_alloc_kpp(kpp_name, 0, 0);
@@ -254,7 +254,7 @@ select_kpp:
 				 chap->qid, ret, gid_name);
 			chap->status = NVME_AUTH_DHCHAP_FAILURE_DHGROUP_UNUSABLE;
 			chap->dh_tfm = NULL;
-			return NVME_SC_AUTH_REQUIRED;
+			return -ret;
 		}
 		dev_dbg(ctrl->device, "qid %d: selected DH group %s\n",
 			chap->qid, gid_name);
@@ -263,7 +263,7 @@ select_kpp:
 			 "qid %d: invalid DH value for NULL DH\n",
 			 chap->qid);
 		chap->status = NVME_AUTH_DHCHAP_FAILURE_INCORRECT_PAYLOAD;
-		return NVME_SC_INVALID_FIELD;
+		return -EPROTO;
 	}
 	chap->dhgroup_id = data->dhgid;
 
@@ -274,7 +274,7 @@ skip_kpp:
 		chap->ctrl_key = kmalloc(dhvlen, GFP_KERNEL);
 		if (!chap->ctrl_key) {
 			chap->status = NVME_AUTH_DHCHAP_FAILURE_FAILED;
-			return NVME_SC_AUTH_REQUIRED;
+			return -ENOMEM;
 		}
 		chap->ctrl_key_len = dhvlen;
 		memcpy(chap->ctrl_key, data->cval + chap->hash_len,
@@ -344,7 +344,7 @@ static int nvme_auth_process_dhchap_success1(struct nvme_ctrl *ctrl,
 
 	if (size > CHAP_BUF_SIZE) {
 		chap->status = NVME_AUTH_DHCHAP_FAILURE_INCORRECT_PAYLOAD;
-		return NVME_SC_INVALID_FIELD;
+		return -EINVAL;
 	}
 
 	if (data->hl != chap->hash_len) {
@@ -352,7 +352,7 @@ static int nvme_auth_process_dhchap_success1(struct nvme_ctrl *ctrl,
 			 "qid %d: invalid hash length %u\n",
 			 chap->qid, data->hl);
 		chap->status = NVME_AUTH_DHCHAP_FAILURE_HASH_UNUSABLE;
-		return NVME_SC_INVALID_FIELD;
+		return -EPROTO;
 	}
 
 	/* Just print out information for the admin queue */
@@ -376,7 +376,7 @@ static int nvme_auth_process_dhchap_success1(struct nvme_ctrl *ctrl,
 			 "qid %d: controller authentication failed\n",
 			 chap->qid);
 		chap->status = NVME_AUTH_DHCHAP_FAILURE_FAILED;
-		return NVME_SC_AUTH_REQUIRED;
+		return -ECONNREFUSED;
 	}
 
 	/* Just print out information for the admin queue */
@@ -730,7 +730,7 @@ static void nvme_queue_auth_work(struct work_struct *work)
 					 NVME_AUTH_DHCHAP_MESSAGE_CHALLENGE);
 	if (ret) {
 		chap->status = ret;
-		chap->error = NVME_SC_AUTH_REQUIRED;
+		chap->error = -ECONNREFUSED;
 		return;
 	}
 
@@ -798,7 +798,7 @@ static void nvme_queue_auth_work(struct work_struct *work)
 					 NVME_AUTH_DHCHAP_MESSAGE_SUCCESS1);
 	if (ret) {
 		chap->status = ret;
-		chap->error = NVME_SC_AUTH_REQUIRED;
+		chap->error = -ECONNREFUSED;
 		return;
 	}
 
@@ -819,7 +819,7 @@ static void nvme_queue_auth_work(struct work_struct *work)
 	ret = nvme_auth_process_dhchap_success1(ctrl, chap);
 	if (ret) {
 		/* Controller authentication failed */
-		chap->error = NVME_SC_AUTH_REQUIRED;
+		chap->error = -ECONNREFUSED;
 		goto fail2;
 	}