net/mlx5: FPGA, support network cards with standalone FPGA

Not all mlx5 cards with FPGA device use it for network processing.

mlx5_core driver configures network connection to FPGA device
for all mlx5 cards with installed FPGA. If FPGA is not a part of
network path, driver crashes in this case

Check FPGA name in function mlx5_fpga_device_start() and continue
integrate FPGA into packets flow only for dedicated cards.
Currently there are Newton and Edison cards.

Signed-off-by: Igor Leshenko <[email protected]>
Reviewed-by: Meir Lichtinger <[email protected]>
Reviewed-by: Boris Pismenny <[email protected]>
Signed-off-by: Saeed Mahameed <[email protected]>

Author: Igor Leshenko

drivers/net/ethernet/mellanox/mlx5/core/fpga/cmd.h

@@ -35,11 +35,11 @@
 
 #include <linux/mlx5/driver.h>
 
-enum mlx5_fpga_device_id {
-	MLX5_FPGA_DEVICE_UNKNOWN = 0,
-	MLX5_FPGA_DEVICE_KU040 = 1,
-	MLX5_FPGA_DEVICE_KU060 = 2,
-	MLX5_FPGA_DEVICE_KU060_2 = 3,
+enum mlx5_fpga_id {
+	MLX5_FPGA_NEWTON = 0,
+	MLX5_FPGA_EDISON = 1,
+	MLX5_FPGA_MORSE = 2,
+	MLX5_FPGA_MORSEQ = 3,
 };
 
 enum mlx5_fpga_image {

drivers/net/ethernet/mellanox/mlx5/core/fpga/core.c

@@ -81,19 +81,28 @@ static const char *mlx5_fpga_image_name(enum mlx5_fpga_image image)
 	}
 }
 
-static const char *mlx5_fpga_device_name(u32 device)
+static const char *mlx5_fpga_name(u32 fpga_id)
 {
-	switch (device) {
-	case MLX5_FPGA_DEVICE_KU040:
-		return "ku040";
-	case MLX5_FPGA_DEVICE_KU060:
-		return "ku060";
-	case MLX5_FPGA_DEVICE_KU060_2:
-		return "ku060_2";
-	case MLX5_FPGA_DEVICE_UNKNOWN:
-	default:
-		return "unknown";
+	static char ret[32];
+
+	switch (fpga_id) {
+	case MLX5_FPGA_NEWTON:
+		return "Newton";
+	case MLX5_FPGA_EDISON:
+		return "Edison";
+	case MLX5_FPGA_MORSE:
+		return "Morse";
+	case MLX5_FPGA_MORSEQ:
+		return "MorseQ";
 	}
+
+	snprintf(ret, sizeof(ret), "Unknown %d", fpga_id);
+	return ret;
+}
+
+static int mlx5_is_fpga_lookaside(u32 fpga_id)
+{
+	return fpga_id != MLX5_FPGA_NEWTON && fpga_id != MLX5_FPGA_EDISON;
 }
 
 static int mlx5_fpga_device_load_check(struct mlx5_fpga_device *fdev)
@@ -110,8 +119,12 @@ static int mlx5_fpga_device_load_check(struct mlx5_fpga_device *fdev)
 	fdev->last_admin_image = query.admin_image;
 	fdev->last_oper_image = query.oper_image;
 
-	mlx5_fpga_dbg(fdev, "Status %u; Admin image %u; Oper image %u\n",
-		      query.status, query.admin_image, query.oper_image);
+	mlx5_fpga_info(fdev, "Status %u; Admin image %u; Oper image %u\n",
+		       query.status, query.admin_image, query.oper_image);
+
+	/* for FPGA lookaside projects FPGA load status is not important */
+	if (mlx5_is_fpga_lookaside(MLX5_CAP_FPGA(fdev->mdev, fpga_id)))
+		return 0;
 
 	if (query.status != MLX5_FPGA_STATUS_SUCCESS) {
 		mlx5_fpga_err(fdev, "%s image failed to load; status %u\n",
@@ -167,25 +180,30 @@ int mlx5_fpga_device_start(struct mlx5_core_dev *mdev)
 	struct mlx5_fpga_device *fdev = mdev->fpga;
 	unsigned int max_num_qps;
 	unsigned long flags;
-	u32 fpga_device_id;
+	u32 fpga_id;
 	int err;
 
 	if (!fdev)
 		return 0;
 
-	err = mlx5_fpga_device_load_check(fdev);
+	err = mlx5_fpga_caps(fdev->mdev);
 	if (err)
 		goto out;
 
-	err = mlx5_fpga_caps(fdev->mdev);
+	err = mlx5_fpga_device_load_check(fdev);
 	if (err)
 		goto out;
 
-	fpga_device_id = MLX5_CAP_FPGA(fdev->mdev, fpga_device);
-	mlx5_fpga_info(fdev, "%s:%u; %s image, version %u; SBU %06x:%04x version %d\n",
-		       mlx5_fpga_device_name(fpga_device_id),
-		       fpga_device_id,
+	fpga_id = MLX5_CAP_FPGA(fdev->mdev, fpga_id);
+	mlx5_fpga_info(fdev, "FPGA card %s:%u\n", mlx5_fpga_name(fpga_id), fpga_id);
+
+	/* No QPs if FPGA does not participate in net processing */
+	if (mlx5_is_fpga_lookaside(fpga_id))
+		goto out;
+
+	mlx5_fpga_info(fdev, "%s(%d): image, version %u; SBU %06x:%04x version %d\n",
 		       mlx5_fpga_image_name(fdev->last_oper_image),
+		       fdev->last_oper_image,
 		       MLX5_CAP_FPGA(fdev->mdev, image_version),
 		       MLX5_CAP_FPGA(fdev->mdev, ieee_vendor_id),
 		       MLX5_CAP_FPGA(fdev->mdev, sandbox_product_id),
@@ -264,6 +282,9 @@ void mlx5_fpga_device_stop(struct mlx5_core_dev *mdev)
 	if (!fdev)
 		return;
 
+	if (mlx5_is_fpga_lookaside(MLX5_CAP_FPGA(fdev->mdev, fpga_id)))
+		return;
+
 	spin_lock_irqsave(&fdev->state_lock, flags);
 	if (fdev->state != MLX5_FPGA_STATUS_SUCCESS) {
 		spin_unlock_irqrestore(&fdev->state_lock, flags);