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Date: Tue, 12 Oct 2021 15:46:44 -0400
From: Sean Anderson <sean.anderson@...o.com>
To: netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: Claudiu Beznea <claudiu.beznea@...rochip.com>,
Nicolas Ferre <nicolas.ferre@...rochip.com>,
Antoine Tenart <atenart@...nel.org>,
Russell King <linux@...linux.org.uk>,
Sean Anderson <sean.anderson@...o.com>
Subject: [PATCH v3 2/2] net: macb: Clean up macb_validate
As the number of interfaces grows, the number of if statements grows
ever more unweildy. Clean everything up a bit by using a switch
statement. This reduces the number of if statements, and the number of
times the same condition is checked. No functional change intended.
Signed-off-by: Sean Anderson <sean.anderson@...o.com>
---
This patch was originally submitted as [1].
There is another approach which could be used here. We could do
something like
macb_set_mode(bp, mask, iface)
{
switch (iface) {
case 10GBASER:
if (...)
phylink_set_10g_modes(mask);
else
return -EINVAL;
break;
case GMII:
/* etc etc */
}
return 0;
}
macb_validate(...)
{
if (state->interface == PHY_INTERFACE_MODE_NA) {
macb_set_mode(bp, mask, PHY_INTERFACE_MODE_10GBASER);
macb_set_mode(bp, mask, PHY_INTERFACE_MODE_GMII);
macb_set_mode(bp, mask, PHY_INTERFACE_MODE_MII);
} else if (macb_set_mode(bp, mask, state->interface)) {
bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
return;
}
/* etc etc */
}
which has the advantage of much cleaner logic in the switch statement.
[1] https://lore.kernel.org/netdev/20211004191527.1610759-9-sean.anderson@seco.com/
Changes in v3:
- Remove labels/gotos in favor of explicit zeroing. Hopefully this
better illustrates the "linear" flow of the logic.
- Add comment with overview of the flow of the logic.
Changes in v2:
- Fix polarity of `one` being inverted
- Only set gigabit modes for NA if macb_is_gem()
drivers/net/ethernet/cadence/macb_main.c | 105 ++++++++++++-----------
1 file changed, 55 insertions(+), 50 deletions(-)
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index cb0f86544955..9b2173c37edb 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -510,33 +510,65 @@ static void macb_validate(struct phylink_config *config,
unsigned long *supported,
struct phylink_link_state *state)
{
+ bool one = state->interface != PHY_INTERFACE_MODE_NA;
struct net_device *ndev = to_net_dev(config->dev);
__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
struct macb *bp = netdev_priv(ndev);
- /* We only support MII, RMII, GMII, RGMII & SGMII. */
- if (state->interface != PHY_INTERFACE_MODE_NA &&
- state->interface != PHY_INTERFACE_MODE_MII &&
- state->interface != PHY_INTERFACE_MODE_RMII &&
- state->interface != PHY_INTERFACE_MODE_GMII &&
- state->interface != PHY_INTERFACE_MODE_SGMII &&
- state->interface != PHY_INTERFACE_MODE_10GBASER &&
- !phy_interface_mode_is_rgmii(state->interface)) {
- bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
- return;
- }
-
- if (!macb_is_gem(bp) &&
- (state->interface == PHY_INTERFACE_MODE_GMII ||
- state->interface == PHY_INTERFACE_MODE_SGMII ||
- phy_interface_mode_is_rgmii(state->interface))) {
- bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
- return;
- }
-
- if (state->interface == PHY_INTERFACE_MODE_10GBASER &&
- !(bp->caps & MACB_CAPS_HIGH_SPEED &&
- bp->caps & MACB_CAPS_PCS)) {
+ /* There are three major types of interfaces we support:
+ * - (R)MII supporting 10/100 Mbit/s
+ * - GMII, RGMII, and SGMII supporting 10/100/1000 Mbit/s
+ * - 10GBASER supporting 10 Gbit/s only
+ * Because GMII and MII both support 10/100, GMII falls through to MII.
+ *
+ * If we can't support an interface mode, we just clear the supported
+ * mask and return. The major complication is that if we get
+ * PHY_INTERFACE_MODE_NA, we must return all modes we support. Because
+ * of this, NA starts at the top of the switch and falls all the way to
+ * the bottom, and doesn't return early if we don't support a
+ * particular mode.
+ */
+ switch (state->interface) {
+ case PHY_INTERFACE_MODE_NA:
+ case PHY_INTERFACE_MODE_10GBASER:
+ if (bp->caps & MACB_CAPS_HIGH_SPEED &&
+ bp->caps & MACB_CAPS_PCS &&
+ bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE) {
+ phylink_set_10g_modes(mask);
+ phylink_set(mask, 10000baseKR_Full);
+ } else if (one) {
+ bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
+ return;
+ }
+ if (one)
+ break;
+ fallthrough;
+ case PHY_INTERFACE_MODE_GMII:
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ case PHY_INTERFACE_MODE_SGMII:
+ if (macb_is_gem(bp)) {
+ if (bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE) {
+ phylink_set(mask, 1000baseT_Full);
+ phylink_set(mask, 1000baseX_Full);
+ if (!(bp->caps & MACB_CAPS_NO_GIGABIT_HALF))
+ phylink_set(mask, 1000baseT_Half);
+ }
+ } else if (one) {
+ bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
+ return;
+ }
+ fallthrough;
+ case PHY_INTERFACE_MODE_MII:
+ case PHY_INTERFACE_MODE_RMII:
+ phylink_set(mask, 10baseT_Half);
+ phylink_set(mask, 10baseT_Full);
+ phylink_set(mask, 100baseT_Half);
+ phylink_set(mask, 100baseT_Full);
+ break;
+ default:
bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
return;
}
@@ -544,33 +576,6 @@ static void macb_validate(struct phylink_config *config,
phylink_set_port_modes(mask);
phylink_set(mask, Autoneg);
phylink_set(mask, Asym_Pause);
-
- if (bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE &&
- (state->interface == PHY_INTERFACE_MODE_NA ||
- state->interface == PHY_INTERFACE_MODE_10GBASER)) {
- phylink_set_10g_modes(mask);
- phylink_set(mask, 10000baseKR_Full);
- if (state->interface != PHY_INTERFACE_MODE_NA)
- goto out;
- }
-
- phylink_set(mask, 10baseT_Half);
- phylink_set(mask, 10baseT_Full);
- phylink_set(mask, 100baseT_Half);
- phylink_set(mask, 100baseT_Full);
-
- if (bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE &&
- (state->interface == PHY_INTERFACE_MODE_NA ||
- state->interface == PHY_INTERFACE_MODE_GMII ||
- state->interface == PHY_INTERFACE_MODE_SGMII ||
- phy_interface_mode_is_rgmii(state->interface))) {
- phylink_set(mask, 1000baseT_Full);
- phylink_set(mask, 1000baseX_Full);
-
- if (!(bp->caps & MACB_CAPS_NO_GIGABIT_HALF))
- phylink_set(mask, 1000baseT_Half);
- }
-out:
bitmap_and(supported, supported, mask, __ETHTOOL_LINK_MODE_MASK_NBITS);
bitmap_and(state->advertising, state->advertising, mask,
__ETHTOOL_LINK_MODE_MASK_NBITS);
--
2.25.1
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