From: Max Gurtovoy <mgurtovoy@nvidia.com>
Date: Tue, 30 Mar 2021 23:01:19 +0000
Subject: [PATCH] nvme-tcp: check sgl supported by target
Git-commit: 73ffcefcfca047e5c13a3f81d2cf22eff18732c1
Patch-mainline: v5.13-rc1
References: git-fixes

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

Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Hannes Reinecke <hare@suse.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 b9e8ea3a7501..8e55d8bc0c50 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1966,6 +1966,11 @@ 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",
-- 
2.29.2