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net: stmmac: Limit the number of MTL queues to hardware capability

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The number of MTL queues to use is specified by the parameter
"snps,{tx,rx}-queues-to-use" from stmmac_platform layer.

However, the maximum numbers of queues are constrained by upper limits
determined by the capability of each hardware feature. It's appropriate
to limit the values not to exceed the upper limit values and display
a warning message.

This only works if the hardware capability has the upper limit values.

Fixes: d976a525c3 ("net: stmmac: multiple queues dt configuration")
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Reviewed-by: Yanteng Si <si.yanteng@linux.dev>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Kunihiko Hayashi 2025-01-27 10:38:18 +09:00 • committed by Paolo Abeni
parent 4f5a52adeb
commit f5fb35a3d6
1 changed files with 15 additions and 0 deletions
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15
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -7221,6 +7221,21 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
if (priv->dma_cap.tsoen)
dev_info(priv->device, "TSO supported\n");
if (priv->dma_cap.number_rx_queues &&
priv->plat->rx_queues_to_use > priv->dma_cap.number_rx_queues) {
dev_warn(priv->device,
"Number of Rx queues (%u) exceeds dma capability\n",
priv->plat->rx_queues_to_use);
priv->plat->rx_queues_to_use = priv->dma_cap.number_rx_queues;
}
if (priv->dma_cap.number_tx_queues &&
priv->plat->tx_queues_to_use > priv->dma_cap.number_tx_queues) {
dev_warn(priv->device,
"Number of Tx queues (%u) exceeds dma capability\n",
priv->plat->tx_queues_to_use);
priv->plat->tx_queues_to_use = priv->dma_cap.number_tx_queues;
}
priv->hw->vlan_fail_q_en =
(priv->plat->flags & STMMAC_FLAG_VLAN_FAIL_Q_EN);
priv->hw->vlan_fail_q = priv->plat->vlan_fail_q;