nvme-fc: check sgl supported by target

SGLs support is mandatory for NVMe/FC, 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>

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index f54ffb7..921b331 100644 (file)
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -3099,6 +3099,11 @@ nvme_fc_create_association(struct nvme_fc_ctrl *ctrl)
        }
 
        /* FC-NVME supports normal SGL Data Block Descriptors */
+       if (!(ctrl->ctrl.sgls & ((1 << 0) | (1 << 1)))) {
+               dev_err(ctrl->ctrl.device,
+                       "Mandatory sgls are not supported!\n");
+               goto out_disconnect_admin_queue;
+       }
 
        if (opts->queue_size > ctrl->ctrl.maxcmd) {
                /* warn if maxcmd is lower than queue_size */