From 2c957ff27dbbabec4ec406420fab9677d59f7161 Mon Sep 17 00:00:00 2001 From: Jack Morgenstein Date: Sun, 3 Nov 2013 10:03:21 +0200 Subject: net/mlx4_core: Don't fail reg/unreg vlan for older guests In upstream kernels under SRIOV, the vlan register/unregister calls were NOPs (doing nothing and returning OK). We detect these old calls from guests (via the comm channel), since previously the port number in mlx4_register_vlan was passed (improperly) in the out_param. This has been corrected so that the port number is now passed in bits 8..15 of the in_modifier field. For old calls, these bits will be zero, so if the passed port number is zero, we can still look at the out_param field to see if it contains a valid port number. If yes, the VM is running an old driver. Since for old drivers, the register/unregister_vlan wrappers were NOPs, we continue this policy -- the reason being that upstream had an additional bug in eth driver running on guests (where procedure mlx4_en_vlan_rx_kill_vid() had the following code: if (!mlx4_find_cached_vlan(mdev->dev, priv->port, vid, &idx)) mlx4_unregister_vlan(mdev->dev, priv->port, idx); else en_err(priv, "could not find vid %d in cache\n", vid); On a VM, mlx4_find_cached_vlan() will always fail, since the vlan cache is located on the Hypervisor; on guests it is empty. Therefore, if we allow upstream guests to register vlans, we will have vlan leakage since the unregister will never be performed. Leaving vlan reg/unreg for old guest drivers as a NOP is not a feature regression, since in upstream the register/unregister vlan wrapper is a NOP. Signed-off-by: Jack Morgenstein Signed-off-by: Or Gerlitz Signed-off-by: David S. Miller --- drivers/net/ethernet/mellanox/mlx4/cmd.c | 1 + drivers/net/ethernet/mellanox/mlx4/mlx4.h | 1 + drivers/net/ethernet/mellanox/mlx4/resource_tracker.c | 17 ++++++++++++++++- 3 files changed, 18 insertions(+), 1 deletion(-) (limited to 'drivers/net/ethernet') diff --git a/drivers/net/ethernet/mellanox/mlx4/cmd.c b/drivers/net/ethernet/mellanox/mlx4/cmd.c index 887d62576f54..65d41b76fa2c 100644 --- a/drivers/net/ethernet/mellanox/mlx4/cmd.c +++ b/drivers/net/ethernet/mellanox/mlx4/cmd.c @@ -1718,6 +1718,7 @@ static void mlx4_master_do_cmd(struct mlx4_dev *dev, int slave, u8 cmd, if (cmd == MLX4_COMM_CMD_RESET) { mlx4_warn(dev, "Received reset from slave:%d\n", slave); slave_state[slave].active = false; + slave_state[slave].old_vlan_api = false; mlx4_master_deactivate_admin_state(priv, slave); for (i = 0; i < MLX4_EVENT_TYPES_NUM; ++i) { slave_state[slave].event_eq[i].eqn = -1; diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4.h b/drivers/net/ethernet/mellanox/mlx4/mlx4.h index f2ad4f61f58c..97941269bc14 100644 --- a/drivers/net/ethernet/mellanox/mlx4/mlx4.h +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4.h @@ -455,6 +455,7 @@ struct mlx4_slave_state { u8 last_cmd; u8 init_port_mask; bool active; + bool old_vlan_api; u8 function; dma_addr_t vhcr_dma; u16 mtu[MLX4_MAX_PORTS + 1]; diff --git a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c index e18bfff04ced..35863889bec0 100644 --- a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c +++ b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c @@ -1555,15 +1555,26 @@ static void rem_slave_vlans(struct mlx4_dev *dev, int slave) } static int vlan_alloc_res(struct mlx4_dev *dev, int slave, int op, int cmd, - u64 in_param, u64 *out_param, int port) + u64 in_param, u64 *out_param, int in_port) { + struct mlx4_priv *priv = mlx4_priv(dev); + struct mlx4_slave_state *slave_state = priv->mfunc.master.slave_state; int err; u16 vlan; int vlan_index; + int port; + + port = !in_port ? get_param_l(out_param) : in_port; if (!port || op != RES_OP_RESERVE_AND_MAP) return -EINVAL; + /* upstream kernels had NOP for reg/unreg vlan. Continue this. */ + if (!in_port && port > 0 && port <= dev->caps.num_ports) { + slave_state[slave].old_vlan_api = true; + return 0; + } + vlan = (u16) in_param; err = __mlx4_register_vlan(dev, port, vlan, &vlan_index); @@ -1856,10 +1867,14 @@ static int mac_free_res(struct mlx4_dev *dev, int slave, int op, int cmd, static int vlan_free_res(struct mlx4_dev *dev, int slave, int op, int cmd, u64 in_param, u64 *out_param, int port) { + struct mlx4_priv *priv = mlx4_priv(dev); + struct mlx4_slave_state *slave_state = priv->mfunc.master.slave_state; int err = 0; switch (op) { case RES_OP_RESERVE_AND_MAP: + if (slave_state[slave].old_vlan_api) + return 0; if (!port) return -EINVAL; vlan_del_from_slave(dev, slave, in_param, port); -- cgit v1.2.3