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net: hns3: add parameter check for tx_copybreak and tx_spare_buf_size

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Since the driver always enables tx bounce buffer,
there are minimum values for `copybreak` and `tx_spare_buf_size`.

This patch will check and reject configurations
with values smaller than these minimums.

Closes: https://lore.kernel.org/all/20250723072900.GV2459@horms.kernel.org/
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Link: https://patch.msgid.link/20250815100414.949752-2-shaojijie@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jijie Shao 2025-08-15 18:04:13 +08:00 committed by Jakub Kicinski
parent 3a752e6780
commit e16e973c57
1 changed files with 33 additions and 0 deletions
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33
drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
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@ -1927,6 +1927,31 @@ static int hns3_set_tx_spare_buf_size(struct net_device *netdev,
return ret;
}
static int hns3_check_tx_copybreak(struct net_device *netdev, u32 copybreak)
{
struct hns3_nic_priv *priv = netdev_priv(netdev);
if (copybreak < priv->min_tx_copybreak) {
netdev_err(netdev, "tx copybreak %u should be no less than %u!\n",
copybreak, priv->min_tx_copybreak);
return -EINVAL;
}
return 0;
}
static int hns3_check_tx_spare_buf_size(struct net_device *netdev, u32 buf_size)
{
struct hns3_nic_priv *priv = netdev_priv(netdev);
if (buf_size < priv->min_tx_spare_buf_size) {
netdev_err(netdev,
"tx spare buf size %u should be no less than %u!\n",
buf_size, priv->min_tx_spare_buf_size);
return -EINVAL;
}
return 0;
}
static int hns3_set_tunable(struct net_device *netdev,
const struct ethtool_tunable *tuna,
const void *data)
@ -1943,6 +1968,10 @@ static int hns3_set_tunable(struct net_device *netdev,
switch (tuna->id) {
case ETHTOOL_TX_COPYBREAK:
ret = hns3_check_tx_copybreak(netdev, *(u32 *)data);
if (ret)
return ret;
priv->tx_copybreak = *(u32 *)data;
for (i = 0; i < h->kinfo.num_tqps; i++)
@ -1957,6 +1986,10 @@ static int hns3_set_tunable(struct net_device *netdev,
break;
case ETHTOOL_TX_COPYBREAK_BUF_SIZE:
ret = hns3_check_tx_spare_buf_size(netdev, *(u32 *)data);
if (ret)
return ret;
old_tx_spare_buf_size = h->kinfo.tx_spare_buf_size;
new_tx_spare_buf_size = *(u32 *)data;
netdev_info(netdev, "request to set tx spare buf size from %u to %u\n",