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linux/drivers/net/mlx4/port.c
Eli Cohen 4c3eb3ca13 IB/mlx4: Add VLAN support for IBoE 
This patch allows IBoE traffic to be encapsulated in 802.1Q tagged
VLAN frames.  The VLAN tag is encoded in the GID and derived from it
by a simple computation.

The netdev notifier callback is modified to catch VLAN device
addition/removal and the port's GID table is updated to reflect the
change, so that for each netdevice there is an entry in the GID table.
When the port's GID table is exhausted, GID entries will not be added.
Only children of the main interfaces can add to the GID table; if a
VLAN interface is added on another VLAN interface (e.g. "vconfig add
eth2.6 8"), then that interfaces will not add an entry to the GID
table.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2010-10-25 10:20:39 -07:00

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/*
* Copyright (c) 2007 Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/errno.h>
#include <linux/if_ether.h>
#include <linux/mlx4/cmd.h>
#include "mlx4.h"
#define MLX4_MAC_VALID (1ull << 63)
#define MLX4_MAC_MASK 0xffffffffffffULL
#define MLX4_VLAN_VALID (1u << 31)
#define MLX4_VLAN_MASK 0xfff
void mlx4_init_mac_table(struct mlx4_dev *dev, struct mlx4_mac_table *table)
{
int i;
mutex_init(&table->mutex);
for (i = 0; i < MLX4_MAX_MAC_NUM; i++) {
table->entries[i] = 0;
table->refs[i] = 0;
}
table->max = 1 << dev->caps.log_num_macs;
table->total = 0;
}
void mlx4_init_vlan_table(struct mlx4_dev *dev, struct mlx4_vlan_table *table)
{
int i;
mutex_init(&table->mutex);
for (i = 0; i < MLX4_MAX_VLAN_NUM; i++) {
table->entries[i] = 0;
table->refs[i] = 0;
}
table->max = 1 << dev->caps.log_num_vlans;
table->total = 0;
}
static int mlx4_set_port_mac_table(struct mlx4_dev *dev, u8 port,
__be64 *entries)
{
struct mlx4_cmd_mailbox *mailbox;
u32 in_mod;
int err;
mailbox = mlx4_alloc_cmd_mailbox(dev);
if (IS_ERR(mailbox))
return PTR_ERR(mailbox);
memcpy(mailbox->buf, entries, MLX4_MAC_TABLE_SIZE);
in_mod = MLX4_SET_PORT_MAC_TABLE << 8 | port;
err = mlx4_cmd(dev, mailbox->dma, in_mod, 1, MLX4_CMD_SET_PORT,
MLX4_CMD_TIME_CLASS_B);
mlx4_free_cmd_mailbox(dev, mailbox);
return err;
}
int mlx4_register_mac(struct mlx4_dev *dev, u8 port, u64 mac, int *index)
{
struct mlx4_mac_table *table = &mlx4_priv(dev)->port[port].mac_table;
int i, err = 0;
int free = -1;
mlx4_dbg(dev, "Registering MAC: 0x%llx\n", (unsigned long long) mac);
mutex_lock(&table->mutex);
for (i = 0; i < MLX4_MAX_MAC_NUM - 1; i++) {
if (free < 0 && !table->refs[i]) {
free = i;
continue;
}
if (mac == (MLX4_MAC_MASK & be64_to_cpu(table->entries[i]))) {
/* MAC already registered, increase refernce count */
*index = i;
++table->refs[i];
goto out;
}
}
mlx4_dbg(dev, "Free MAC index is %d\n", free);
if (table->total == table->max) {
/* No free mac entries */
err = -ENOSPC;
goto out;
}
/* Register new MAC */
table->refs[free] = 1;
table->entries[free] = cpu_to_be64(mac | MLX4_MAC_VALID);
err = mlx4_set_port_mac_table(dev, port, table->entries);
if (unlikely(err)) {
mlx4_err(dev, "Failed adding MAC: 0x%llx\n", (unsigned long long) mac);
table->refs[free] = 0;
table->entries[free] = 0;
goto out;
}
*index = free;
++table->total;
out:
mutex_unlock(&table->mutex);
return err;
}
EXPORT_SYMBOL_GPL(mlx4_register_mac);
void mlx4_unregister_mac(struct mlx4_dev *dev, u8 port, int index)
{
struct mlx4_mac_table *table = &mlx4_priv(dev)->port[port].mac_table;
mutex_lock(&table->mutex);
if (!table->refs[index]) {
mlx4_warn(dev, "No MAC entry for index %d\n", index);
goto out;
}
if (--table->refs[index]) {
mlx4_warn(dev, "Have more references for index %d,"
"no need to modify MAC table\n", index);
goto out;
}
table->entries[index] = 0;
mlx4_set_port_mac_table(dev, port, table->entries);
--table->total;
out:
mutex_unlock(&table->mutex);
}
EXPORT_SYMBOL_GPL(mlx4_unregister_mac);
static int mlx4_set_port_vlan_table(struct mlx4_dev *dev, u8 port,
__be32 *entries)
{
struct mlx4_cmd_mailbox *mailbox;
u32 in_mod;
int err;
mailbox = mlx4_alloc_cmd_mailbox(dev);
if (IS_ERR(mailbox))
return PTR_ERR(mailbox);
memcpy(mailbox->buf, entries, MLX4_VLAN_TABLE_SIZE);
in_mod = MLX4_SET_PORT_VLAN_TABLE << 8 | port;
err = mlx4_cmd(dev, mailbox->dma, in_mod, 1, MLX4_CMD_SET_PORT,
MLX4_CMD_TIME_CLASS_B);
mlx4_free_cmd_mailbox(dev, mailbox);
return err;
}
int mlx4_find_cached_vlan(struct mlx4_dev *dev, u8 port, u16 vid, int *idx)
{
struct mlx4_vlan_table *table = &mlx4_priv(dev)->port[port].vlan_table;
int i;
for (i = 0; i < MLX4_MAX_VLAN_NUM; ++i) {
if (table->refs[i] &&
(vid == (MLX4_VLAN_MASK &
be32_to_cpu(table->entries[i])))) {
/* VLAN already registered, increase reference count */
*idx = i;
return 0;
}
}
return -ENOENT;
}
EXPORT_SYMBOL_GPL(mlx4_find_cached_vlan);
int mlx4_register_vlan(struct mlx4_dev *dev, u8 port, u16 vlan, int *index)
{
struct mlx4_vlan_table *table = &mlx4_priv(dev)->port[port].vlan_table;
int i, err = 0;
int free = -1;
mutex_lock(&table->mutex);
for (i = MLX4_VLAN_REGULAR; i < MLX4_MAX_VLAN_NUM; i++) {
if (free < 0 && (table->refs[i] == 0)) {
free = i;
continue;
}
if (table->refs[i] &&
(vlan == (MLX4_VLAN_MASK &
be32_to_cpu(table->entries[i])))) {
/* Vlan already registered, increase refernce count */
*index = i;
++table->refs[i];
goto out;
}
}
if (table->total == table->max) {
/* No free vlan entries */
err = -ENOSPC;
goto out;
}
/* Register new MAC */
table->refs[free] = 1;
table->entries[free] = cpu_to_be32(vlan | MLX4_VLAN_VALID);
err = mlx4_set_port_vlan_table(dev, port, table->entries);
if (unlikely(err)) {
mlx4_warn(dev, "Failed adding vlan: %u\n", vlan);
table->refs[free] = 0;
table->entries[free] = 0;
goto out;
}
*index = free;
++table->total;
out:
mutex_unlock(&table->mutex);
return err;
}
EXPORT_SYMBOL_GPL(mlx4_register_vlan);
void mlx4_unregister_vlan(struct mlx4_dev *dev, u8 port, int index)
{
struct mlx4_vlan_table *table = &mlx4_priv(dev)->port[port].vlan_table;
if (index < MLX4_VLAN_REGULAR) {
mlx4_warn(dev, "Trying to free special vlan index %d\n", index);
return;
}
mutex_lock(&table->mutex);
if (!table->refs[index]) {
mlx4_warn(dev, "No vlan entry for index %d\n", index);
goto out;
}
if (--table->refs[index]) {
mlx4_dbg(dev, "Have more references for index %d,"
"no need to modify vlan table\n", index);
goto out;
}
table->entries[index] = 0;
mlx4_set_port_vlan_table(dev, port, table->entries);
--table->total;
out:
mutex_unlock(&table->mutex);
}
EXPORT_SYMBOL_GPL(mlx4_unregister_vlan);
int mlx4_get_port_ib_caps(struct mlx4_dev *dev, u8 port, __be32 *caps)
{
struct mlx4_cmd_mailbox *inmailbox, *outmailbox;
u8 *inbuf, *outbuf;
int err;
inmailbox = mlx4_alloc_cmd_mailbox(dev);
if (IS_ERR(inmailbox))
return PTR_ERR(inmailbox);
outmailbox = mlx4_alloc_cmd_mailbox(dev);
if (IS_ERR(outmailbox)) {
mlx4_free_cmd_mailbox(dev, inmailbox);
return PTR_ERR(outmailbox);
}
inbuf = inmailbox->buf;
outbuf = outmailbox->buf;
memset(inbuf, 0, 256);
memset(outbuf, 0, 256);
inbuf[0] = 1;
inbuf[1] = 1;
inbuf[2] = 1;
inbuf[3] = 1;
*(__be16 *) (&inbuf[16]) = cpu_to_be16(0x0015);
*(__be32 *) (&inbuf[20]) = cpu_to_be32(port);
err = mlx4_cmd_box(dev, inmailbox->dma, outmailbox->dma, port, 3,
MLX4_CMD_MAD_IFC, MLX4_CMD_TIME_CLASS_C);
if (!err)
*caps = *(__be32 *) (outbuf + 84);
mlx4_free_cmd_mailbox(dev, inmailbox);
mlx4_free_cmd_mailbox(dev, outmailbox);
return err;
}
int mlx4_SET_PORT(struct mlx4_dev *dev, u8 port)
{
struct mlx4_cmd_mailbox *mailbox;
int err;
if (dev->caps.port_type[port] == MLX4_PORT_TYPE_ETH)
return 0;
mailbox = mlx4_alloc_cmd_mailbox(dev);
if (IS_ERR(mailbox))
return PTR_ERR(mailbox);
memset(mailbox->buf, 0, 256);
((__be32 *) mailbox->buf)[1] = dev->caps.ib_port_def_cap[port];
err = mlx4_cmd(dev, mailbox->dma, port, 0, MLX4_CMD_SET_PORT,
MLX4_CMD_TIME_CLASS_B);
mlx4_free_cmd_mailbox(dev, mailbox);
return err;
}
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