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authorJack Morgenstein <jackm@dev.mellanox.co.il>2014-09-11 15:11:16 +0400
committerRoland Dreier <roland@purestorage.com>2014-09-22 20:46:53 +0400
commitf4fd40b26bd597e203639281859a758402550d62 (patch)
tree5f72bffb9bcaada61af36ca24a2f123b7150bd22 /drivers/net/ethernet
parenta59c5850f09b4c2d6ad2fc47e5e1be8d654529d6 (diff)
downloadlinux-f4fd40b26bd597e203639281859a758402550d62.tar.xz
mlx4: Fix mlx4 reg/unreg mac to work properly with 0-mac addresses
There is a chance that the VF mlx4 RoCE driver (mlx4_ib) may see a 0-mac as the current default MAC address when a RoCE interface first comes up. In this case, the RoCE driver registers the 0-mac to get its MAC index -- used in the INIT2RTR transition when it creates its proxy Q1 qp's. If we do not allow QP1 to be created, the RoCE driver will not come up. If we do not register the 0-mac, but simply use a random mac-index, QP1 will attempt to send packets with an someone's else source MAC which will get the system into more troubled. Since a 0-mac was previously used to indicate a free slot, this leads to errors, both when the 0-mac is registered and when it is unregistered. The required fix is to check in addition that the slot containing the 0-mac has a reference count of zero. Additionally, when comparing MAC addresses, need to mask out the 2 MSBs of the u64 mac on both sides of the comparison. Note that when the EN driver (mlx4_en) comes up, it set itself a proper mac --> the RoCE driver gets to be notified on that and further handing is done with the update qp command, as was added by commit 9433c188915c ("IB/mlx4: Invoke UPDATE_QP for proxy QP1 on MAC changes"). Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il> Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/net/ethernet')
-rw-r--r--drivers/net/ethernet/mellanox/mlx4/port.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/port.c b/drivers/net/ethernet/mellanox/mlx4/port.c
index 9ba0c1ca10d5..94eeb2c7d7e4 100644
--- a/drivers/net/ethernet/mellanox/mlx4/port.c
+++ b/drivers/net/ethernet/mellanox/mlx4/port.c
@@ -103,7 +103,8 @@ static int find_index(struct mlx4_dev *dev,
int i;
for (i = 0; i < MLX4_MAX_MAC_NUM; i++) {
- if ((mac & MLX4_MAC_MASK) ==
+ if (table->refs[i] &&
+ (MLX4_MAC_MASK & mac) ==
(MLX4_MAC_MASK & be64_to_cpu(table->entries[i])))
return i;
}
@@ -165,12 +166,14 @@ int __mlx4_register_mac(struct mlx4_dev *dev, u8 port, u64 mac)
mutex_lock(&table->mutex);
for (i = 0; i < MLX4_MAX_MAC_NUM; i++) {
- if (free < 0 && !table->entries[i]) {
- free = i;
+ if (!table->refs[i]) {
+ if (free < 0)
+ free = i;
continue;
}
- if (mac == (MLX4_MAC_MASK & be64_to_cpu(table->entries[i]))) {
+ if ((MLX4_MAC_MASK & mac) ==
+ (MLX4_MAC_MASK & be64_to_cpu(table->entries[i]))) {
/* MAC already registered, increment ref count */
err = i;
++table->refs[i];