[PATCH] nvme-fc: set max_segments to lldd max value

[James Smart]

Currently the FC transport is set max_hw_sectors based on the lldds
max sgl segment count. However, the block queue max segments is
set based on the controller's max_segments count, which the transport
does not set.  As such, the lldd is receiving sgl lists that are
exceeding its max segment count.

Set the controller max segment count and derive max_hw_sectors from
the max segment count.

Signed-off-by: James Smart <jsmart2021 at gmail.com>
Reviewed-by: Ewan D. Milne <emilne at redhat.com>
CC: Max Gurtovoy <maxg at mellanox.com>

---
Looks like the setting of max_segments has been missing from all
fabric transports for a while. Rdma had a fixup (ff13c1b87c97) from
Max last fall that corrected this. But tcp and fc were still lacking.
Copying Max to look at tcp.
---
 drivers/nvme/host/fc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 6aa30bb5a762..e57e536546f7 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -3001,8 +3001,9 @@ nvme_fc_create_association(struct nvme_fc_ctrl *ctrl)
 	if (ret)
 		goto out_disconnect_admin_queue;
 
-	ctrl->ctrl.max_hw_sectors =
-		(ctrl->lport->ops->max_sgl_segments - 1) << (PAGE_SHIFT - 9);
+	ctrl->ctrl.max_segments = ctrl->lport->ops->max_sgl_segments;
+	ctrl->ctrl.max_hw_sectors = ctrl->ctrl.max_segments <<
+						(ilog2(SZ_4K) - 9);
 
 	blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
 
-- 
2.26.2