1 files changed, 40 insertions, 3 deletions

diff --git a/drivers/net/wireless/ath/wil6210/txrx.c b/drivers/net/wireless/ath/wil6210/txrx.c
index 072182e527e6..edab4c0a900f 100644
--- a/drivers/net/wireless/ath/wil6210/txrx.c
+++ b/drivers/net/wireless/ath/wil6210/txrx.c
@@ -37,6 +37,10 @@ bool rx_align_2;
 module_param(rx_align_2, bool, 0444);
 MODULE_PARM_DESC(rx_align_2, " align Rx buffers on 4*n+2, default - no");
 
+bool rx_large_buf;
+module_param(rx_large_buf, bool, 0444);
+MODULE_PARM_DESC(rx_large_buf, " allocate 8KB RX buffers, default - no");
+
 static inline uint wil_rx_snaplen(void)
 {
 	return rx_align_2 ? 6 : 0;
@@ -123,15 +127,32 @@ static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring)
 		vring->va = NULL;
 		return -ENOMEM;
 	}
+
 	/* vring->va should be aligned on its size rounded up to power of 2
-	 * This is granted by the dma_alloc_coherent
+	 * This is granted by the dma_alloc_coherent.
+	 *
+	 * HW has limitation that all vrings addresses must share the same
+	 * upper 16 msb bits part of 48 bits address. To workaround that,
+	 * if we are using 48 bit addresses switch to 32 bit allocation
+	 * before allocating vring memory.
+	 *
+	 * There's no check for the return value of dma_set_mask_and_coherent,
+	 * since we assume if we were able to set the mask during
+	 * initialization in this system it will not fail if we set it again
 	 */
+	if (wil->use_extended_dma_addr)
+		dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+
 	vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL);
 	if (!vring->va) {
 		kfree(vring->ctx);
 		vring->ctx = NULL;
 		return -ENOMEM;
 	}
+
+	if (wil->use_extended_dma_addr)
+		dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
+
 	/* initially, all descriptors are SW owned
 	 * For Tx and Rx, ownership bit is at the same location, thus
 	 * we can use any
@@ -238,7 +259,7 @@ static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
 			       u32 i, int headroom)
 {
 	struct device *dev = wil_to_dev(wil);
-	unsigned int sz = mtu_max + ETH_HLEN + wil_rx_snaplen();
+	unsigned int sz = wil->rx_buf_len + ETH_HLEN + wil_rx_snaplen();
 	struct vring_rx_desc dd, *d = ⅆ
 	volatile struct vring_rx_desc *_d = &vring->va[i].rx;
 	dma_addr_t pa;
@@ -402,7 +423,7 @@ static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
 	struct sk_buff *skb;
 	dma_addr_t pa;
 	unsigned int snaplen = wil_rx_snaplen();
-	unsigned int sz = mtu_max + ETH_HLEN + snaplen;
+	unsigned int sz = wil->rx_buf_len + ETH_HLEN + snaplen;
 	u16 dmalen;
 	u8 ftype;
 	int cid;
@@ -763,6 +784,20 @@ void wil_rx_handle(struct wil6210_priv *wil, int *quota)
 	wil_rx_refill(wil, v->size);
 }
 
+static void wil_rx_buf_len_init(struct wil6210_priv *wil)
+{
+	wil->rx_buf_len = rx_large_buf ?
+		WIL_MAX_ETH_MTU : TXRX_BUF_LEN_DEFAULT - WIL_MAX_MPDU_OVERHEAD;
+	if (mtu_max > wil->rx_buf_len) {
+		/* do not allow RX buffers to be smaller than mtu_max, for
+		 * backward compatibility (mtu_max parameter was also used
+		 * to support receiving large packets)
+		 */
+		wil_info(wil, "Override RX buffer to mtu_max(%d)\n", mtu_max);
+		wil->rx_buf_len = mtu_max;
+	}
+}
+
 int wil_rx_init(struct wil6210_priv *wil, u16 size)
 {
 	struct vring *vring = &wil->vring_rx;
@@ -775,6 +810,8 @@ int wil_rx_init(struct wil6210_priv *wil, u16 size)
 		return -EINVAL;
 	}
 
+	wil_rx_buf_len_init(wil);
+
 	vring->size = size;
 	rc = wil_vring_alloc(wil, vring);
 	if (rc)