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- From 3470079687448abac42deb62774253be1d6bdef3 Mon Sep 17 00:00:00 2001
- From: Christian Marangi <[email protected]>
- Date: Sat, 23 Jul 2022 16:29:33 +0200
- Subject: [PATCH 5/5] net: ethernet: stmicro: stmmac: permit MTU change with
- interface up
- Remove the limitation where the interface needs to be down to change
- MTU by releasing and opening the stmmac driver to set the new MTU.
- Also call the set_filter function to correctly init the port.
- This permits to remove the EBUSY error while the ethernet port is
- running permitting a correct MTU change if for example a DSA request
- a MTU change for a switch CPU port.
- Signed-off-by: Christian Marangi <[email protected]>
- Signed-off-by: Jakub Kicinski <[email protected]>
- ---
- .../net/ethernet/stmicro/stmmac/stmmac_main.c | 30 +++++++++++++++----
- 1 file changed, 24 insertions(+), 6 deletions(-)
- --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
- +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
- @@ -5627,18 +5627,15 @@ static int stmmac_change_mtu(struct net_
- {
- struct stmmac_priv *priv = netdev_priv(dev);
- int txfifosz = priv->plat->tx_fifo_size;
- + struct stmmac_dma_conf *dma_conf;
- const int mtu = new_mtu;
- + int ret;
-
- if (txfifosz == 0)
- txfifosz = priv->dma_cap.tx_fifo_size;
-
- txfifosz /= priv->plat->tx_queues_to_use;
-
- - if (netif_running(dev)) {
- - netdev_err(priv->dev, "must be stopped to change its MTU\n");
- - return -EBUSY;
- - }
- -
- if (stmmac_xdp_is_enabled(priv) && new_mtu > ETH_DATA_LEN) {
- netdev_dbg(priv->dev, "Jumbo frames not supported for XDP\n");
- return -EINVAL;
- @@ -5650,8 +5647,29 @@ static int stmmac_change_mtu(struct net_
- if ((txfifosz < new_mtu) || (new_mtu > BUF_SIZE_16KiB))
- return -EINVAL;
-
- - dev->mtu = mtu;
- + if (netif_running(dev)) {
- + netdev_dbg(priv->dev, "restarting interface to change its MTU\n");
- + /* Try to allocate the new DMA conf with the new mtu */
- + dma_conf = stmmac_setup_dma_desc(priv, mtu);
- + if (IS_ERR(dma_conf)) {
- + netdev_err(priv->dev, "failed allocating new dma conf for new MTU %d\n",
- + mtu);
- + return PTR_ERR(dma_conf);
- + }
- +
- + stmmac_release(dev);
- +
- + ret = __stmmac_open(dev, dma_conf);
- + kfree(dma_conf);
- + if (ret) {
- + netdev_err(priv->dev, "failed reopening the interface after MTU change\n");
- + return ret;
- + }
- +
- + stmmac_set_rx_mode(dev);
- + }
-
- + dev->mtu = mtu;
- netdev_update_features(dev);
-
- return 0;
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