Hello!
On 01/05/2017 01:43 PM, Simon Horman wrote:
From: Kazuya Mizuguchi <[email protected]>
"swiotlb buffer is full" errors occur after repeated initialisation of a
device - f.e. suspend/resume or ip link set up/down. This is because memory
mapped using dma_map_single() in ravb_ring_format() and ravb_start_xmit()
is not released. Resolve this problem by unmapping descriptors when
freeing rings.
Note, ravb_tx_free() is moved but not otherwise modified by this patch.
Signed-off-by: Kazuya Mizuguchi <[email protected]>
[simon: reworked]
Signed-off-by: Simon Horman <[email protected]>
--
v1 [Kazuya Mizuguchi]
v2 [Simon Horman]
* As suggested by Sergei Shtylyov
- Use dma_mapping_error() and rx_desc->ds_cc when unmapping RX descriptors;
this is consistent with the way that they are mapped
- Use ravb_tx_free() to clear TX descriptors
Not sure that was good idea (sorry)... ravb_tx_ring() only unmaps the
transmitted buffers, while we need to unmap everything...
* Reduce scope of new local variable
---
drivers/net/ethernet/renesas/ravb_main.c | 89 ++++++++++++++++++--------------
1 file changed, 51 insertions(+), 38 deletions(-)
diff --git a/drivers/net/ethernet/renesas/ravb_main.c
b/drivers/net/ethernet/renesas/ravb_main.c
index 92d7692c840d..1797c48e3176 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -179,6 +179,44 @@ static struct mdiobb_ops bb_ops = {
.get_mdio_data = ravb_get_mdio_data,
};
+/* Free TX skb function for AVB-IP */
+static int ravb_tx_free(struct net_device *ndev, int q)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ struct net_device_stats *stats = &priv->stats[q];
+ struct ravb_tx_desc *desc;
+ int free_num = 0;
+ int entry;
+ u32 size;
+
+ for (; priv->cur_tx[q] - priv->dirty_tx[q] > 0; priv->dirty_tx[q]++) {
+ entry = priv->dirty_tx[q] % (priv->num_tx_ring[q] *
+ NUM_TX_DESC);
+ desc = &priv->tx_ring[q][entry];
+ if (desc->die_dt != DT_FEMPTY)
Here, it stop once an untransmitted buffer is encountered...
+ break;
+ /* Descriptor type must be checked before all other reads */
+ dma_rmb();
+ size = le16_to_cpu(desc->ds_tagl) & TX_DS;
+ /* Free the original skb. */
+ if (priv->tx_skb[q][entry / NUM_TX_DESC]) {
+ dma_unmap_single(ndev->dev.parent,
le32_to_cpu(desc->dptr),
+ size, DMA_TO_DEVICE);
+ /* Last packet descriptor? */
+ if (entry % NUM_TX_DESC == NUM_TX_DESC - 1) {
+ entry /= NUM_TX_DESC;
+ dev_kfree_skb_any(priv->tx_skb[q][entry]);
+ priv->tx_skb[q][entry] = NULL;
+ stats->tx_packets++;
+ }
+ free_num++;
+ }
+ stats->tx_bytes += size;
+ desc->die_dt = DT_EEMPTY;
+ }
+ return free_num;
+}
+
/* Free skb's and DMA buffers for Ethernet AVB */
static void ravb_ring_free(struct net_device *ndev, int q)
{
@@ -207,6 +245,18 @@ static void ravb_ring_free(struct net_device *ndev, int q)
priv->tx_align[q] = NULL;
if (priv->rx_ring[q]) {
+ for (i = 0; i < priv->num_rx_ring[q]; i++) {
+ struct ravb_ex_rx_desc *rx_desc = &priv->rx_ring[q][i];
+
+ if (!dma_mapping_error(ndev->dev.parent,
+ rx_desc->dptr)) {
You forgot le32_to_cpu() here, we can't use the raw descriptor fields.
+ dma_unmap_single(ndev->dev.parent,
+ le32_to_cpu(rx_desc->dptr),
+ PKT_BUF_SZ,
+ DMA_FROM_DEVICE);
+ rx_desc->ds_cc = cpu_to_le16(0);
You don't check it anyway, not sure what that buys...
[...]
MBR, Sergei
