[PATCH 1/2] nvme-tcp: check sgl supported by target

[Max Gurtovoy]

SGLs support is mandatory for NVMe/tcp, make sure that the target is
aligned to the specification.

Signed-off-by: Max Gurtovoy <mgurtovoy at nvidia.com>
---
 drivers/nvme/host/tcp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index a0f00cb8f9f3..e5fbb921165e 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1973,6 +1973,11 @@ static int nvme_tcp_setup_ctrl(struct nvme_ctrl *ctrl, bool new)
 		goto destroy_admin;
 	}
 
+	if (!(ctrl->sgls & ((1 << 0) | (1 << 1)))) {
+		dev_err(ctrl->device, "Mandatory sgls are not supported!\n");
+		goto destroy_admin;
+	}
+
 	if (opts->queue_size > ctrl->sqsize + 1)
 		dev_warn(ctrl->device,
 			"queue_size %zu > ctrl sqsize %u, clamping down\n",
-- 
2.25.4