[PATCH 1/3] nvme: add a quirk to disable namespace identifiers

[Christoph Hellwig]

Add a quirk to disable using and exporting namespace identifiers for
controllers where they are broken beyond repair.

Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/core.c | 24 ++++++++++++++++++------
 drivers/nvme/host/nvme.h |  5 +++++
 2 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index efb85c6d8e2d5..41314dccb2209 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1282,6 +1282,8 @@ static int nvme_process_ns_desc(struct nvme_ctrl *ctrl, struct nvme_ns_ids *ids,
 
 	switch (cur->nidt) {
 	case NVME_NIDT_EUI64:
+		if (ctrl->quirks & NVME_QUIRK_BOGUS_NID)
+			return NVME_NIDT_EUI64_LEN;
 		if (cur->nidl != NVME_NIDT_EUI64_LEN) {
 			dev_warn(ctrl->device, "%s %d for NVME_NIDT_EUI64\n",
 				 warn_str, cur->nidl);
@@ -1290,6 +1292,8 @@ static int nvme_process_ns_desc(struct nvme_ctrl *ctrl, struct nvme_ns_ids *ids,
 		memcpy(ids->eui64, data + sizeof(*cur), NVME_NIDT_EUI64_LEN);
 		return NVME_NIDT_EUI64_LEN;
 	case NVME_NIDT_NGUID:
+		if (ctrl->quirks & NVME_QUIRK_BOGUS_NID)
+			return NVME_NIDT_NGUID_LEN;
 		if (cur->nidl != NVME_NIDT_NGUID_LEN) {
 			dev_warn(ctrl->device, "%s %d for NVME_NIDT_NGUID\n",
 				 warn_str, cur->nidl);
@@ -1298,6 +1302,8 @@ static int nvme_process_ns_desc(struct nvme_ctrl *ctrl, struct nvme_ns_ids *ids,
 		memcpy(ids->nguid, data + sizeof(*cur), NVME_NIDT_NGUID_LEN);
 		return NVME_NIDT_NGUID_LEN;
 	case NVME_NIDT_UUID:
+		if (ctrl->quirks & NVME_QUIRK_BOGUS_NID)
+			return NVME_NIDT_UUID_LEN;
 		if (cur->nidl != NVME_NIDT_UUID_LEN) {
 			dev_warn(ctrl->device, "%s %d for NVME_NIDT_UUID\n",
 				 warn_str, cur->nidl);
@@ -1399,12 +1405,18 @@ static int nvme_identify_ns(struct nvme_ctrl *ctrl, unsigned nsid,
 	if ((*id)->ncap == 0) /* namespace not allocated or attached */
 		goto out_free_id;
 
-	if (ctrl->vs >= NVME_VS(1, 1, 0) &&
-	    !memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
-		memcpy(ids->eui64, (*id)->eui64, sizeof(ids->eui64));
-	if (ctrl->vs >= NVME_VS(1, 2, 0) &&
-	    !memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
-		memcpy(ids->nguid, (*id)->nguid, sizeof(ids->nguid));
+
+	if (ctrl->quirks & NVME_QUIRK_BOGUS_NID) {
+		dev_info(ctrl->device,
+			 "Ignoring bogus Namespace Identifiers\n");
+	} else {
+		if (ctrl->vs >= NVME_VS(1, 1, 0) &&
+		    !memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
+			memcpy(ids->eui64, (*id)->eui64, sizeof(ids->eui64));
+		if (ctrl->vs >= NVME_VS(1, 2, 0) &&
+		    !memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
+			memcpy(ids->nguid, (*id)->nguid, sizeof(ids->nguid));
+	}
 
 	return 0;
 
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 1393bbf82d71e..a2b53ca633359 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -144,6 +144,11 @@ enum nvme_quirks {
 	 * encoding the generation sequence number.
 	 */
 	NVME_QUIRK_SKIP_CID_GEN			= (1 << 17),
+
+	/*
+	 * Reports garbage in the namespace identifiers (eui64, nguid, uuid).
+	 */
+	NVME_QUIRK_BOGUS_NID			= (1 << 18),
 };
 
 /*
-- 
2.30.2