netdev - [PATCH net-next 2/3] net: mhi: Get RX queue size from MHI core

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Date:   Mon, 11 Jan 2021 19:07:41 +0100
From:   Loic Poulain <loic.poulain@...aro.org>
To:     kuba@...nel.org, davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        manivannan.sadhasivam@...aro.org,
        Loic Poulain <loic.poulain@...aro.org>
Subject: [PATCH net-next 2/3] net: mhi: Get RX queue size from MHI core

The RX queue size can be determined at runtime by retrieving the
number of available transfer descriptors.

Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
---
 drivers/net/mhi_net.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/mhi_net.c b/drivers/net/mhi_net.c
index b7f7f2e..3da820b 100644
--- a/drivers/net/mhi_net.c
+++ b/drivers/net/mhi_net.c
@@ -257,9 +257,6 @@ static int mhi_net_probe(struct mhi_device *mhi_dev,
 	mhi_netdev->mdev = mhi_dev;
 	SET_NETDEV_DEV(ndev, &mhi_dev->dev);
 
-	/* All MHI net channels have 128 ring elements (at least for now) */
-	mhi_netdev->rx_queue_sz = 128;
-
 	INIT_DELAYED_WORK(&mhi_netdev->rx_refill, mhi_net_rx_refill_work);
 	u64_stats_init(&mhi_netdev->stats.rx_syncp);
 	u64_stats_init(&mhi_netdev->stats.tx_syncp);
@@ -269,6 +266,9 @@ static int mhi_net_probe(struct mhi_device *mhi_dev,
 	if (err)
 		goto out_err;
 
+	/* Number of transfer descriptors determines size of the queue */
+	mhi_netdev->rx_queue_sz = mhi_get_free_desc_count(mhi_dev, DMA_FROM_DEVICE);
+
 	err = register_netdev(ndev);
 	if (err)
 		goto out_err;
-- 
2.7.4