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qca_debug: Fix ethtool -G iface tx behavior

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[ Upstream commit 96a7e861d9e04d07febd3011c30cd84cd141d81f ]

After calling ethtool -g it was not possible to adjust the TX ring
size again:

  # ethtool -g eth1
  Ring parameters for eth1:
  Pre-set maximums:
  RX:		4
  RX Mini:	n/a
  RX Jumbo:	n/a
  TX:		10
  Current hardware settings:
  RX:		4
  RX Mini:	n/a
  RX Jumbo:	n/a
  TX:		10
  # ethtool -G eth1 tx 8
  netlink error: Invalid argument

The reason for this is that the readonly setting rx_pending get
initialized and after that the range check in qcaspi_set_ringparam()
fails regardless of the provided parameter. So fix this by accepting
the exposed RX defaults. Instead of adding another magic number
better use a new define here.

Fixes: 291ab06ecf ("net: qualcomm: new Ethernet over SPI driver for QCA7000")
Suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Link: https://lore.kernel.org/r/20231206141222.52029-3-wahrenst@gmx.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Stefan Wahren 2023-12-06 15:12:21 +01:00 committed by Greg Kroah-Hartman
parent b7f5868664
commit 51ad9c19bb
1 changed files with 5 additions and 3 deletions
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8
drivers/net/ethernet/qualcomm/qca_debug.c
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@ -30,6 +30,8 @@
#define QCASPI_MAX_REGS 0x20
#define QCASPI_RX_MAX_FRAMES 4
static const u16 qcaspi_spi_regs[] = {
SPI_REG_BFR_SIZE,
SPI_REG_WRBUF_SPC_AVA,
@ -249,9 +251,9 @@ qcaspi_get_ringparam(struct net_device *dev, struct ethtool_ringparam *ring)
{
struct qcaspi *qca = netdev_priv(dev);
ring->rx_max_pending = 4;
ring->rx_max_pending = QCASPI_RX_MAX_FRAMES;
ring->tx_max_pending = TX_RING_MAX_LEN;
ring->rx_pending = 4;
ring->rx_pending = QCASPI_RX_MAX_FRAMES;
ring->tx_pending = qca->txr.count;
}
@ -260,7 +262,7 @@ qcaspi_set_ringparam(struct net_device *dev, struct ethtool_ringparam *ring)
{
struct qcaspi *qca = netdev_priv(dev);
if ((ring->rx_pending) ||
if (ring->rx_pending != QCASPI_RX_MAX_FRAMES ||
(ring->rx_mini_pending) ||
(ring->rx_jumbo_pending))
return -EINVAL;