net/igb/e1000/e1000e: more robust ethtool duplex/speed configuration
This makes sure that one cannot request a 99Mbps full-duplex and get a
100Mbps half-duplex configuration in return due to the way the
speed/duplex parameters are handled internally.
Tested: e1000 works
Signed-off-by: David Decotigny <decot@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index cdfd572..ce7838e 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -6349,21 +6349,25 @@
}
}
-int igb_set_spd_dplx(struct igb_adapter *adapter, u16 spddplx)
+int igb_set_spd_dplx(struct igb_adapter *adapter, u32 spd, u8 dplx)
{
struct pci_dev *pdev = adapter->pdev;
struct e1000_mac_info *mac = &adapter->hw.mac;
mac->autoneg = 0;
+ /* Make sure dplx is at most 1 bit and lsb of speed is not set
+ * for the switch() below to work */
+ if ((spd & 1) || (dplx & ~1))
+ goto err_inval;
+
/* Fiber NIC's only allow 1000 Gbps Full duplex */
if ((adapter->hw.phy.media_type == e1000_media_type_internal_serdes) &&
- spddplx != (SPEED_1000 + DUPLEX_FULL)) {
- dev_err(&pdev->dev, "Unsupported Speed/Duplex configuration\n");
- return -EINVAL;
- }
+ spd != SPEED_1000 &&
+ dplx != DUPLEX_FULL)
+ goto err_inval;
- switch (spddplx) {
+ switch (spd + dplx) {
case SPEED_10 + DUPLEX_HALF:
mac->forced_speed_duplex = ADVERTISE_10_HALF;
break;
@@ -6382,10 +6386,13 @@
break;
case SPEED_1000 + DUPLEX_HALF: /* not supported */
default:
- dev_err(&pdev->dev, "Unsupported Speed/Duplex configuration\n");
- return -EINVAL;
+ goto err_inval;
}
return 0;
+
+err_inval:
+ dev_err(&pdev->dev, "Unsupported Speed/Duplex configuration\n");
+ return -EINVAL;
}
static int __igb_shutdown(struct pci_dev *pdev, bool *enable_wake)