netdev - [net-next 4/7] net/mlx5: FPGA, Abort FPGA init if the device reports no QP capability

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Date:   Tue, 29 May 2018 17:46:47 -0700
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Yevgeny Kliteynik <kliteyn@...lanox.com>,
        Adi Nissim <adin@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net-next 4/7] net/mlx5: FPGA, Abort FPGA init if the device reports no QP capability

From: Yevgeny Kliteynik <kliteyn@...lanox.com>

In the case that the reported max number of QPs capability
equals to zero, abort FPGA init.

Signed-off-by: Yevgeny Kliteynik <kliteyn@...lanox.com>
Signed-off-by: Adi Nissim <adin@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/fpga/core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fpga/core.c b/drivers/net/ethernet/mellanox/mlx5/core/fpga/core.c
index 02319f779a49..26caa0475985 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fpga/core.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fpga/core.c
@@ -170,6 +170,12 @@ int mlx5_fpga_device_start(struct mlx5_core_dev *mdev)
 		       MLX5_CAP_FPGA(fdev->mdev, sandbox_product_version));
 
 	max_num_qps = MLX5_CAP_FPGA(mdev, shell_caps.max_num_qps);
+	if (!max_num_qps) {
+		mlx5_fpga_err(fdev, "FPGA reports 0 QPs in SHELL_CAPS\n");
+		err = -ENOTSUPP;
+		goto out;
+	}
+
 	err = mlx5_core_reserve_gids(mdev, max_num_qps);
 	if (err)
 		goto out;
-- 
2.17.0