linux-kernel - [PATCH v3 3/5] fpga: dfl: fix VF creation in OFS

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Date:   Tue,  1 Mar 2022 01:21:21 -0500
From:   Tianfei zhang <tianfei.zhang@...el.com>
To:     hao.wu@...el.com, trix@...hat.com, mdf@...nel.org,
        yilun.xu@...el.com, linux-fpga@...r.kernel.org,
        linux-doc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, corbet@....net,
        Tianfei zhang <tianfei.zhang@...el.com>,
        Matthew Gerlach <matthew.gerlach@...ux.intel.com>
Subject: [PATCH v3 3/5] fpga: dfl: fix VF creation in OFS

In OFS legacy model, there is only 1 Port device related to
1 VF, the flag DFL_FEAT_PORT_CONNECTED_AFU will take notes for
this model. In legacy model, it need to check the released port
number match VF device number or not. But in "Multiple VFs per
PR slot" model, the Port device would not connected to AFU/PR
slot, so we don't need to release the Port device before creating
the VFs.

Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
Signed-off-by: Tianfei zhang <tianfei.zhang@...el.com>
---
 drivers/fpga/dfl.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index 5872031c2e9f..fd04ef5c8b03 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -1702,11 +1702,13 @@ int dfl_fpga_cdev_config_ports_vf(struct dfl_fpga_cdev *cdev, int num_vfs)
 
 	mutex_lock(&cdev->lock);
 	/*
-	 * can't turn multiple ports into 1 VF device, only 1 port for 1 VF
-	 * device, so if released port number doesn't match VF device number,
-	 * then reject the request with -EINVAL error code.
+	 * In the OFS legacy model, it can't turn multiple ports into 1 VF
+	 * device, because only 1 port conneced to 1 VF device, so if released
+	 * port number doesn't match VF device number, then reject the request
+	 * with -EINVAL error code.
 	 */
-	if (cdev->released_port_num != num_vfs) {
+	if ((cdev->features & DFL_FEAT_PORT_CONNECTED_AFU) &&
+	    cdev->released_port_num != num_vfs) {
 		ret = -EINVAL;
 		goto done;
 	}
-- 
2.26.2