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