wil6210: add support for enhanced DMA TX data flows

The enhanced DMA TX data path is handled using a descriptor
ring per connection and a single status ring.

The driver gets TX completions via the TX status ring. Each
status message points to the completed descriptor ring and
includes the number of completed descriptors in this ring.

Non TSO enhanced DMA TX descriptors are similar to legacy DMA
TX descriptors, hence the same transmit function can be used.

However, enhanced DMA TSO frames division is performed by the
HW, hence a new function is added to handle enhanced DMA TSO.

Signed-off-by: Gidon Studinski <gidons@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 33 insertions, 3 deletions

diff --git a/drivers/net/wireless/ath/wil6210/netdev.c b/drivers/net/wireless/ath/wil6210/netdev.c
index 3c6a59fd08df..eeda2b618e6e 100644
--- a/drivers/net/wireless/ath/wil6210/netdev.c
+++ b/drivers/net/wireless/ath/wil6210/netdev.c
@@ -157,6 +157,30 @@ static int wil6210_netdev_poll_tx(struct napi_struct *napi, int budget)
 	return min(tx_done, budget);
 }
 
+static int wil6210_netdev_poll_tx_edma(struct napi_struct *napi, int budget)
+{
+	struct wil6210_priv *wil = container_of(napi, struct wil6210_priv,
+						napi_tx);
+	int tx_done;
+	/* There is only one status TX ring */
+	struct wil_status_ring *sring = &wil->srings[wil->tx_sring_idx];
+
+	if (!sring->va)
+		return 0;
+
+	tx_done = wil_tx_sring_handler(wil, sring);
+
+	if (tx_done < budget) {
+		napi_complete(napi);
+		wil6210_unmask_irq_tx_edma(wil);
+		wil_dbg_txrx(wil, "NAPI TX complete\n");
+	}
+
+	wil_dbg_txrx(wil, "NAPI TX poll(%d) done %d\n", budget, tx_done);
+
+	return min(tx_done, budget);
+}
+
 static void wil_dev_setup(struct net_device *dev)
 {
 	ether_setup(dev);
@@ -420,9 +444,15 @@ int wil_if_add(struct wil6210_priv *wil)
 	init_dummy_netdev(&wil->napi_ndev);
 	netif_napi_add(&wil->napi_ndev, &wil->napi_rx, wil6210_netdev_poll_rx,
 		       WIL6210_NAPI_BUDGET);
-	netif_tx_napi_add(&wil->napi_ndev,
-			  &wil->napi_tx, wil6210_netdev_poll_tx,
-			  WIL6210_NAPI_BUDGET);
+	if (wil->use_enhanced_dma_hw)
+		netif_tx_napi_add(&wil->napi_ndev,
+				  &wil->napi_tx, wil6210_netdev_poll_tx_edma,
+				  WIL6210_NAPI_BUDGET);
+	else
+		netif_tx_napi_add(&wil->napi_ndev,
+				  &wil->napi_tx, wil6210_netdev_poll_tx,
+				  WIL6210_NAPI_BUDGET);
+
 
 	wil_update_net_queues_bh(wil, vif, NULL, true);