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Message-Id: <20180212200033.1802-1-niklas.soderlund+renesas@ragnatech.se>
Date: Mon, 12 Feb 2018 21:00:33 +0100
From: Niklas Söderlund
<niklas.soderlund+renesas@...natech.se>
To: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
"David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc: linux-renesas-soc@...r.kernel.org,
Niklas Söderlund
<niklas.soderlund+renesas@...natech.se>
Subject: [PATCH] ravb: add support for changing MTU
Allow for chancing the MTU within the limit of the maximum size of a
descriptor (2048 bytes). Add the callback to change MTU from user-space
and take the configurable MTU into account when configuring the
hardware.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
---
drivers/net/ethernet/renesas/ravb.h | 1 +
drivers/net/ethernet/renesas/ravb_main.c | 34 +++++++++++++++++++++++++-------
2 files changed, 28 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index 96a27b00c90e212a..b81f4faf7b10114d 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -1018,6 +1018,7 @@ struct ravb_private {
u32 dirty_rx[NUM_RX_QUEUE]; /* Producer ring indices */
u32 cur_tx[NUM_TX_QUEUE];
u32 dirty_tx[NUM_TX_QUEUE];
+ u32 rx_buf_sz; /* Based on MTU+slack. */
struct napi_struct napi[NUM_RX_QUEUE];
struct work_struct work;
/* MII transceiver section. */
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index c87f57ca44371586..a4870c9e42195802 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -238,7 +238,7 @@ static void ravb_ring_free(struct net_device *ndev, int q)
le32_to_cpu(desc->dptr)))
dma_unmap_single(ndev->dev.parent,
le32_to_cpu(desc->dptr),
- PKT_BUF_SZ,
+ priv->rx_buf_sz,
DMA_FROM_DEVICE);
}
ring_size = sizeof(struct ravb_ex_rx_desc) *
@@ -300,9 +300,9 @@ static void ravb_ring_format(struct net_device *ndev, int q)
for (i = 0; i < priv->num_rx_ring[q]; i++) {
/* RX descriptor */
rx_desc = &priv->rx_ring[q][i];
- rx_desc->ds_cc = cpu_to_le16(PKT_BUF_SZ);
+ rx_desc->ds_cc = cpu_to_le16(priv->rx_buf_sz);
dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data,
- PKT_BUF_SZ,
+ le16_to_cpu(rx_desc->ds_cc),
DMA_FROM_DEVICE);
/* We just set the data size to 0 for a failed mapping which
* should prevent DMA from happening...
@@ -346,6 +346,10 @@ static int ravb_ring_init(struct net_device *ndev, int q)
int ring_size;
int i;
+ /* +16 gets room from the status from the card. */
+ priv->rx_buf_sz = (ndev->mtu <= 1492 ? PKT_BUF_SZ : ndev->mtu) +
+ ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN + 16;
+
/* Allocate RX and TX skb rings */
priv->rx_skb[q] = kcalloc(priv->num_rx_ring[q],
sizeof(*priv->rx_skb[q]), GFP_KERNEL);
@@ -355,7 +359,7 @@ static int ravb_ring_init(struct net_device *ndev, int q)
goto error;
for (i = 0; i < priv->num_rx_ring[q]; i++) {
- skb = netdev_alloc_skb(ndev, PKT_BUF_SZ + RAVB_ALIGN - 1);
+ skb = netdev_alloc_skb(ndev, priv->rx_buf_sz + RAVB_ALIGN - 1);
if (!skb)
goto error;
ravb_set_buffer_align(skb);
@@ -586,7 +590,7 @@ static bool ravb_rx(struct net_device *ndev, int *quota, int q)
skb = priv->rx_skb[q][entry];
priv->rx_skb[q][entry] = NULL;
dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
- PKT_BUF_SZ,
+ priv->rx_buf_sz,
DMA_FROM_DEVICE);
get_ts &= (q == RAVB_NC) ?
RAVB_RXTSTAMP_TYPE_V2_L2_EVENT :
@@ -619,11 +623,12 @@ static bool ravb_rx(struct net_device *ndev, int *quota, int q)
for (; priv->cur_rx[q] - priv->dirty_rx[q] > 0; priv->dirty_rx[q]++) {
entry = priv->dirty_rx[q] % priv->num_rx_ring[q];
desc = &priv->rx_ring[q][entry];
- desc->ds_cc = cpu_to_le16(PKT_BUF_SZ);
+ desc->ds_cc = cpu_to_le16(priv->rx_buf_sz);
if (!priv->rx_skb[q][entry]) {
skb = netdev_alloc_skb(ndev,
- PKT_BUF_SZ + RAVB_ALIGN - 1);
+ priv->rx_buf_sz +
+ RAVB_ALIGN - 1);
if (!skb)
break; /* Better luck next round. */
ravb_set_buffer_align(skb);
@@ -1854,6 +1859,17 @@ static int ravb_do_ioctl(struct net_device *ndev, struct ifreq *req, int cmd)
return phy_mii_ioctl(phydev, req, cmd);
}
+static int ravb_change_mtu(struct net_device *ndev, int new_mtu)
+{
+ if (netif_running(ndev))
+ return -EBUSY;
+
+ ndev->mtu = new_mtu;
+ netdev_update_features(ndev);
+
+ return 0;
+}
+
static void ravb_set_rx_csum(struct net_device *ndev, bool enable)
{
struct ravb_private *priv = netdev_priv(ndev);
@@ -1895,6 +1911,7 @@ static const struct net_device_ops ravb_netdev_ops = {
.ndo_set_rx_mode = ravb_set_rx_mode,
.ndo_tx_timeout = ravb_tx_timeout,
.ndo_do_ioctl = ravb_do_ioctl,
+ .ndo_change_mtu = ravb_change_mtu,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = eth_mac_addr,
.ndo_set_features = ravb_set_features,
@@ -2117,6 +2134,9 @@ static int ravb_probe(struct platform_device *pdev)
goto out_release;
}
+ ndev->max_mtu = 2048 - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN);
+ ndev->min_mtu = ETH_MIN_MTU;
+
/* Set function */
ndev->netdev_ops = &ravb_netdev_ops;
ndev->ethtool_ops = &ravb_ethtool_ops;
--
2.16.1
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