[PATCH AUTOSEL 6.12 22/28] nvme-tcp: add basic support for the C2HTermReq PDU

Sasha Levin
2025-02-24T11:19:04Z

From: Maurizio Lombardi <mlombard@redhat.com>

[ Upstream commit 84e009042d0f3dfe91bec60bcd208ee3f866cbcd ]

Previously, the NVMe/TCP host driver did not handle the C2HTermReq PDU,
instead printing "unsupported pdu type (3)" when received. This patch adds
support for processing the C2HTermReq PDU, allowing the driver
to print the Fatal Error Status field.

Example of output:
nvme nvme4: Received C2HTermReq (FES = Invalid PDU Header Field)

Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/nvme/host/tcp.c | 43 ++++++++++++++++++++++++++++++++++++++++
include/linux/nvme-tcp.h | 2 ++
2 files changed, 45 insertions(+)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 8305d3c128074..2065389c0b9ca 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -763,6 +763,40 @@ static int nvme_tcp_handle_r2t(struct nvme_tcp_queue *queue,
return 0;
}

+static void nvme_tcp_handle_c2h_term(struct nvme_tcp_queue *queue,
+ struct nvme_tcp_term_pdu *pdu)
+{
+ u16 fes;
+ const char *msg;
+ u32 plen = le32_to_cpu(pdu->hdr.plen);
+
+ static const char * const msg_table[] = {
+ [NVME_TCP_FES_INVALID_PDU_HDR] = "Invalid PDU Header Field",
+ [NVME_TCP_FES_PDU_SEQ_ERR] = "PDU Sequence Error",
+ [NVME_TCP_FES_HDR_DIGEST_ERR] = "Header Digest Error",
+ [NVME_TCP_FES_DATA_OUT_OF_RANGE] = "Data Transfer Out Of Range",
+ [NVME_TCP_FES_R2T_LIMIT_EXCEEDED] = "R2T Limit Exceeded",
+ [NVME_TCP_FES_UNSUPPORTED_PARAM] = "Unsupported Parameter",
+ };
+
+ if (plen < NVME_TCP_MIN_C2HTERM_PLEN ||
+ plen > NVME_TCP_MAX_C2HTERM_PLEN) {
+ dev_err(queue->ctrl->ctrl.device,
+ "Received a malformed C2HTermReq PDU (plen = %u)\n",
+ plen);
+ return;
+ }
+
+ fes = le16_to_cpu(pdu->fes);
+ if (fes && fes < ARRAY_SIZE(msg_table))
+ msg = msg_table[fes];
+ else
+ msg = "Unknown";
+
+ dev_err(queue->ctrl->ctrl.device,
+ "Received C2HTermReq (FES = %s)\n", msg);
+}
+
static int nvme_tcp_recv_pdu(struct nvme_tcp_queue *queue, struct sk_buff *skb,
unsigned int *offset, size_t *len)
{
@@ -784,6 +818,15 @@ static int nvme_tcp_recv_pdu(struct nvme_tcp_queue *queue, struct sk_buff *skb,
return 0;

hdr = queue->pdu;
+ if (unlikely(hdr->type == nvme_tcp_c2h_term)) {
+ /*
+ * C2HTermReq never includes Header or Data digests.
+ * Skip the checks.
+ */
+ nvme_tcp_handle_c2h_term(queue, (void *)queue->pdu);
+ return -EINVAL;
+ }
+
if (queue->hdr_digest) {
ret = nvme_tcp_verify_hdgst(queue, queue->pdu, hdr->hlen);
if (unlikely(ret))
diff --git a/include/linux/nvme-tcp.h b/include/linux/nvme-tcp.h
index e07e8978d691b..e435250fcb4d0 100644
--- a/include/linux/nvme-tcp.h
+++ b/include/linux/nvme-tcp.h
@@ -13,6 +13,8 @@
#define NVME_TCP_ADMIN_CCSZ SZ_8K
#define NVME_TCP_DIGEST_LENGTH 4
#define NVME_TCP_MIN_MAXH2CDATA 4096
+#define NVME_TCP_MIN_C2HTERM_PLEN 24
+#define NVME_TCP_MAX_C2HTERM_PLEN 152

enum nvme_tcp_pfv {
NVME_TCP_PFV_1_0 = 0x0,
--
2.39.5