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Message-Id: <1483613000-537-1-git-send-email-horms+renesas@verge.net.au>
Date: Thu, 5 Jan 2017 11:43:20 +0100
From: Simon Horman <horms+renesas@...ge.net.au>
To: David Miller <davem@...emloft.net>,
Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc: Magnus Damm <magnus.damm@...il.com>, netdev@...r.kernel.org,
linux-renesas-soc@...r.kernel.org
Subject: [PATCH/RFC v2 net-next] ravb: unmap descriptors when freeing rings
From: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
"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 <kazuya.mizuguchi.ks@...esas.com>
[simon: reworked]
Signed-off-by: Simon Horman <horms+renesas@...ge.net.au>
--
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
* 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)
+ 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)) {
+ 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);
+ }
+ }
ring_size = sizeof(struct ravb_ex_rx_desc) *
(priv->num_rx_ring[q] + 1);
dma_free_coherent(ndev->dev.parent, ring_size, priv->rx_ring[q],
@@ -215,6 +265,7 @@ static void ravb_ring_free(struct net_device *ndev, int q)
}
if (priv->tx_ring[q]) {
+ ravb_tx_free(ndev, q);
ring_size = sizeof(struct ravb_tx_desc) *
(priv->num_tx_ring[q] * NUM_TX_DESC + 1);
dma_free_coherent(ndev->dev.parent, ring_size, priv->tx_ring[q],
@@ -431,44 +482,6 @@ static int ravb_dmac_init(struct net_device *ndev)
return 0;
}
-/* 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)
- 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;
-}
-
static void ravb_get_tx_tstamp(struct net_device *ndev)
{
struct ravb_private *priv = netdev_priv(ndev);
--
2.7.0.rc3.207.g0ac5344
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