/*
* drivers/net/ethernet/mellanox/mlxsw/core.c
* Copyright (c) 2015 Mellanox Technologies. All rights reserved.
* Copyright (c) 2015 Jiri Pirko <jiri@mellanox.com>
* Copyright (c) 2015 Ido Schimmel <idosch@mellanox.com>
* Copyright (c) 2015 Elad Raz <eladr@mellanox.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/if_link.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/u64_stats_sync.h>
#include <linux/netdevice.h>
#include <linux/wait.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/gfp.h>
#include <linux/random.h>
#include <linux/jiffies.h>
#include <linux/mutex.h>
#include <linux/rcupdate.h>
#include <linux/slab.h>
#include <asm/byteorder.h>
#include "core.h"
#include "item.h"
#include "cmd.h"
#include "port.h"
#include "trap.h"
#include "emad.h"
#include "reg.h"
static LIST_HEAD(mlxsw_core_driver_list);
static DEFINE_SPINLOCK(mlxsw_core_driver_list_lock);
static const char mlxsw_core_driver_name[] = "mlxsw_core";
static struct dentry *mlxsw_core_dbg_root;
struct mlxsw_core_pcpu_stats {
u64 trap_rx_packets[MLXSW_TRAP_ID_MAX];
u64 trap_rx_bytes[MLXSW_TRAP_ID_MAX];
u64 port_rx_packets[MLXSW_PORT_MAX_PORTS];
u64 port_rx_bytes[MLXSW_PORT_MAX_PORTS];
struct u64_stats_sync syncp;
u32 trap_rx_dropped[MLXSW_TRAP_ID_MAX];
u32 port_rx_dropped[MLXSW_PORT_MAX_PORTS];
u32 trap_rx_invalid;
u32 port_rx_invalid;
};
struct mlxsw_core {
struct mlxsw_driver *driver;
const struct mlxsw_bus *bus;
void *bus_priv;
const struct mlxsw_bus_info *bus_info;
struct list_head rx_listener_list;
struct list_head event_listener_list;
struct {
struct sk_buff *resp_skb;
u64 tid;
wait_queue_head_t wait;
bool trans_active;
struct mutex lock; /* One EMAD transaction at a time. */
bool use_emad;
} emad;
struct mlxsw_core_pcpu_stats __percpu *pcpu_stats;
struct dentry *dbg_dir;
struct {
struct debugfs_blob_wrapper vsd_blob;
struct debugfs_blob_wrapper psid_blob;
} dbg;
unsigned long driver_priv[0];
/* driver_priv has to be always the last item */
};
struct mlxsw_rx_listener_item {
struct list_head list;
struct mlxsw_rx_listener rxl;
void *priv;
};
struct mlxsw_event_listener_item {
struct list_head list;
struct mlxsw_event_listener el;
void *priv;
};
/******************
* EMAD processing
******************/
/* emad_eth_hdr_dmac
* Destination MAC in EMAD's Ethernet header.
* Must be set to 01:02:c9:00:00:01
*/
MLXSW_ITEM_BUF(emad, eth_hdr, dmac, 0x00, 6);
/* emad_eth_hdr_smac
* Source MAC in EMAD's Ethernet header.
* Must be set to 00:02:c9:01:02:03
*/
MLXSW_ITEM_BUF(emad, eth_hdr, smac, 0x06, 6);
/* emad_eth_hdr_ethertype
* Ethertype in EMAD's Ethernet header.
* Must be set to 0x8932
*/
MLXSW_ITEM32(emad, eth_hdr, ethertype, 0x0C, 16, 16);
/* emad_eth_hdr_mlx_proto
* Mellanox protocol.
* Must be set to 0x0.
*/
MLXSW_ITEM32(emad, eth_hdr, mlx_proto, 0x0C, 8, 8);
/* emad_eth_hdr_ver
* Mellanox protocol version.
* Must be set to 0x0.
*/
MLXSW_ITEM32(emad, eth_hdr, ver, 0x0C, 4, 4);
/* emad_op_tlv_type
* Type of the TLV.
* Must be set to 0x1 (operation TLV).
*/
MLXSW_ITEM32(emad, op_tlv, type, 0x00, 27, 5);
/* emad_op_tlv_len
* Length of the operation TLV in u32.
* Must be set to 0x4.
*/
MLXSW_ITEM32(emad, op_tlv, len, 0x00, 16, 11);
/* emad_op_tlv_dr
* Direct route bit. Setting to 1 indicates the EMAD is a direct route
* EMAD. DR TLV must follow.
*
* Note: Currently not supported and must not be set.
*/
MLXSW_ITEM32(emad, op_tlv, dr, 0x00, 15, 1);
/* emad_op_tlv_status
* Returned status in case of EMAD response. Must be set to 0 in case
* of EMAD request.
* 0x0 - success
* 0x1 - device is busy. Requester should retry
* 0x2 - Mellanox protocol version not supported
* 0x3 - unknown TLV
* 0x4 - register not supported
* 0x5 - operation class not supported
* 0x6 - EMAD method not supported
* 0x7 - bad parameter (e.g. port out of range)
* 0x8 - resource not available
* 0x9 - message receipt acknowledgment. Requester should retry
* 0x70 - internal error
*/
MLXSW_ITEM32(emad, op_tlv, status, 0x00, 8, 7);
/* emad_op_tlv_register_id
* Register ID of register within register TLV.
*/
MLXSW_ITEM32(emad, op_tlv, register_id, 0x04, 16, 16);
/* emad_op_tlv_r
* Response bit. Setting to 1 indicates Response, otherwise request.
*/
MLXSW_ITEM32(emad, op_tlv, r, 0x04, 15, 1);
/* emad_op_tlv_method
* EMAD method type.
* 0x1 - query
* 0x2 - write
* 0x3 - send (currently not supported)
* 0x4 - event
*/
MLXSW_ITEM32(emad, op_tlv, method, 0x04, 8, 7);
/* emad_op_tlv_class
* EMAD operation class. Must be set to 0x1 (REG_ACCESS).
*/
MLXSW_ITEM32(emad, op_tlv, class, 0x04, 0, 8);
/* emad_op_tlv_tid
* EMAD transaction ID. Used for pairing request and response EMADs.
*/
MLXSW_ITEM64(emad, op_tlv, tid, 0x08, 0, 64);
/* emad_reg_tlv_type
* Type of the TLV.
* Must be set to 0x3 (register TLV).
*/
MLXSW_ITEM32(emad, reg_tlv, type, 0x00, 27, 5);
/* emad_reg_tlv_len
* Length of the operation TLV in u32.
*/
MLXSW_ITEM32(emad, reg_tlv, len, 0x00, 16, 11);
/* emad_end_tlv_type
* Type of the TLV.
* Must be set to 0x0 (end TLV).
*/
MLXSW_ITEM32(emad, end_tlv, type, 0x00, 27, 5);
/* emad_end_tlv_len
* Length of the end TLV in u32.
* Must be set to 1.
*/
MLXSW_ITEM32(emad, end_tlv, len, 0x00, 16, 11);
enum mlxsw_core_reg_access_type {
MLXSW_CORE_REG_ACCESS_TYPE_QUERY,
MLXSW_CORE_REG_ACCESS_TYPE_WRITE,
};
static inline const char *
mlxsw_core_reg_access_type_str(enum mlxsw_core_reg_access_type type)
{
switch (type) {
case MLXSW_CORE_REG_ACCESS_TYPE_QUERY:
return "query";
case MLXSW_CORE_REG_ACCESS_TYPE_WRITE:
return "write";
}
BUG();
}
static void mlxsw_emad_pack_end_tlv(char *end_tlv)
{
mlxsw_emad_end_tlv_type_set(end_tlv, MLXSW_EMAD_TLV_TYPE_END);
mlxsw_emad_end_tlv_len_set(end_tlv, MLXSW_EMAD_END_TLV_LEN);
}
static void mlxsw_emad_pack_reg_tlv(char *reg_tlv,
const struct mlxsw_reg_info *reg,
char *payload)
{
mlxsw_emad_reg_tlv_type_set(reg_tlv, MLXSW_EMAD_TLV_TYPE_REG);
mlxsw_emad_reg_tlv_len_set(reg_tlv, reg->len / sizeof(u32) + 1);
memcpy(reg_tlv + sizeof(u32), payload, reg->len);
}
static void mlxsw_emad_pack_op_tlv(char *op_tlv,
const struct mlxsw_reg_info *reg,
enum mlxsw_core_reg_access_type type,
struct mlxsw_core *mlxsw_core)
{
mlxsw_emad_op_tlv_type_set(op_tlv, MLXSW_EMAD_TLV_TYPE_OP);
mlxsw_emad_op_tlv_len_set(op_tlv, MLXSW_EMAD_OP_TLV_LEN);
mlxsw_emad_op_tlv_dr_set(op_tlv, 0);
mlxsw_emad_op_tlv_status_set(op_tlv, 0);
mlxsw_emad_op_tlv_register_id_set(op_tlv, reg->id);
mlxsw_emad_op_tlv_r_set(op_tlv, MLXSW_EMAD_OP_TLV_REQUEST);
if (type == MLXSW_CORE_REG_ACCESS_TYPE_QUERY)
mlxsw_emad_op_tlv_method_set(op_tlv,
MLXSW_EMAD_OP_TLV_METHOD_QUERY);
else
mlxsw_emad_op_tlv_method_set(op_tlv,
MLXSW_EMAD_OP_TLV_METHOD_WRITE);
mlxsw_emad_op_tlv_class_set(op_tlv,
MLXSW_EMAD_OP_TLV_CLASS_REG_ACCESS);
mlxsw_emad_op_tlv_tid_set(op_tlv, mlxsw_core->emad.tid);
}
static int mlxsw_emad_construct_eth_hdr(struct sk_buff *skb)
{
char *eth_hdr = skb_push(skb, MLXSW_EMAD_ETH_HDR_LEN);
mlxsw_emad_eth_hdr_dmac_memcpy_to(eth_hdr, MLXSW_EMAD_EH_DMAC);
mlxsw_emad_eth_hdr_smac_memcpy_to(eth_hdr, MLXSW_EMAD_EH_SMAC);
mlxsw_emad_eth_hdr_ethertype_set(eth_hdr, MLXSW_EMAD_EH_ETHERTYPE);
mlxsw_emad_eth_hdr_mlx_proto_set(eth_hdr, MLXSW_EMAD_EH_MLX_PROTO);
mlxsw_emad_eth_hdr_ver_set(eth_hdr, MLXSW_EMAD_EH_PROTO_VERSION);
skb_reset_mac_header(skb);
return 0;
}
static void mlxsw_emad_construct(struct sk_buff *skb,
const struct mlxsw_reg_info *reg,
char *payload,
enum mlxsw_core_reg_access_type type,
struct mlxsw_core *mlxsw_core)
{
char *buf;
buf = skb_push(skb, MLXSW_EMAD_END_TLV_LEN * sizeof(u32));
mlxsw_emad_pack_end_tlv(buf);
buf = skb_push(skb, reg->len + sizeof(u32));
mlxsw_emad_pack_reg_tlv(buf, reg, payload);
buf = skb_push(skb, MLXSW_EMAD_OP_TLV_LEN * sizeof(u32));
mlxsw_emad_pack_op_tlv(buf, reg, type, mlxsw_core);
mlxsw_emad_construct_eth_hdr(skb);
}
static char *mlxsw_emad_op_tlv(const struct sk_buff *skb)
{
return ((char *) (skb->data + MLXSW_EMAD_ETH_HDR_LEN));
}
static char *mlxsw_emad_reg_tlv(const struct sk_buff *skb)
{
return ((char *) (skb->data + MLXSW_EMAD_ETH_HDR_LEN +
MLXSW_EMAD_OP_TLV_LEN * sizeof(u32)));
}
static char *mlxsw_emad_reg_payload(const char *op_tlv)
{
return ((char *) (op_tlv + (MLXSW_EMAD_OP_TLV_LEN + 1) * sizeof(u32)));
}
static u64 mlxsw_emad_get_tid(const struct sk_buff *skb)
{
char *op_tlv;
op_tlv = mlxsw_emad_op_tlv(skb);
return mlxsw_emad_op_tlv_tid_get(op_tlv);
}
static bool mlxsw_emad_is_resp(const struct sk_buff *skb)
{
char *op_tlv;
op_tlv = mlxsw_emad_op_tlv(skb);
return (mlxsw_emad_op_tlv_r_get(op_tlv) == MLXSW_EMAD_OP_TLV_RESPONSE);
}
#define MLXSW_EMAD_TIMEOUT_MS 200
static int __mlxsw_emad_transmit(struct mlxsw_core *mlxsw_core,
struct sk_buff *skb,
const struct mlxsw_tx_info *tx_info)
{
int err;
int ret;
mlxsw_core->emad.trans_active = true;
err = mlxsw_core_skb_transmit(mlxsw_core->driver_priv, skb, tx_info);
if (err) {
dev_err(mlxsw_core->bus_info->dev, "Failed to transmit EMAD (tid=%llx)\n",
mlxsw_core->emad.tid);
dev_kfree_skb(skb);
goto trans_inactive_out;
}
ret = wait_event_timeout(mlxsw_core->emad.wait,
!(mlxsw_core->emad.trans_active),
msecs_to_jiffies(MLXSW_EMAD_TIMEOUT_MS));
if (!ret) {
dev_warn(mlxsw_core->bus_info->dev, "EMAD timed-out (tid=%llx)\n",
mlxsw_core->emad.tid);
err = -EIO;
goto trans_inactive_out;
}
return 0;
trans_inactive_out:
mlxsw_core->emad.trans_active = false;
return err;
}
static int mlxsw_emad_process_status(struct mlxsw_core *mlxsw_core,
char *op_tlv)
{
enum mlxsw_emad_op_tlv_status status;
u64 tid;
status = mlxsw_emad_op_tlv_status_get(op_tlv);
tid = mlxsw_emad_op_tlv_tid_get(op_tlv);
switch (status) {
case MLXSW_EMAD_OP_TLV_STATUS_SUCCESS:
return 0;
case MLXSW_EMAD_OP_TLV_STATUS_BUSY:
case MLXSW_EMAD_OP_TLV_STATUS_MESSAGE_RECEIPT_ACK:
dev_warn(mlxsw_core->bus_info->dev, "Reg access status again (tid=%llx,status=%x(%s))\n",
tid, status, mlxsw_emad_op_tlv_status_str(status));
return -EAGAIN;
case MLXSW_EMAD_OP_TLV_STATUS_VERSION_NOT_SUPPORTED:
case MLXSW_EMAD_OP_TLV_STATUS_UNKNOWN_TLV:
case MLXSW_EMAD_OP_TLV_STATUS_REGISTER_NOT_SUPPORTED:
case MLXSW_EMAD_OP_TLV_STATUS_CLASS_NOT_SUPPORTED:
case MLXSW_EMAD_OP_TLV_STATUS_METHOD_NOT_SUPPORTED:
case MLXSW_EMAD_OP_TLV_STATUS_BAD_PARAMETER:
case MLXSW_EMAD_OP_TLV_STATUS_RESOURCE_NOT_AVAILABLE:
case MLXSW_EMAD_OP_TLV_STATUS_INTERNAL_ERROR:
default:
dev_err(mlxsw_core->bus_info->dev, "Reg access status failed (tid=%llx,status=%x(%s))\n",
tid, status, mlxsw_emad_op_tlv_status_str(status));
return -EIO;
}
}
static int mlxsw_emad_process_status_skb(struct mlxsw_core *mlxsw_core,
struct sk_buff *skb)
{
return mlxsw_emad_process_status(mlxsw_core, mlxsw_emad_op_tlv(skb));
}
static int mlxsw_emad_transmit(struct mlxsw_core *mlxsw_core,
struct sk_buff *skb,
const struct mlxsw_tx_info *tx_info)
{
struct sk_buff *trans_skb;
int n_retry;
int err;
n_retry = 0;
retry:
/* We copy the EMAD to a new skb, since we might need
* to retransmit it in case of failure.
*/
trans_skb = skb_copy(skb, GFP_KERNEL);
if (!trans_skb) {
err = -ENOMEM;
goto out;
}
err = __mlxsw_emad_transmit(mlxsw_core, trans_skb, tx_info);
if (!err) {
struct sk_buff *resp_skb = mlxsw_core->emad.resp_skb;
err = mlxsw_emad_process_status_skb(mlxsw_core, resp_skb);
if (err)
dev_kfree_skb(resp_skb);
if (!err || err != -EAGAIN)
goto out;
}
if (n_retry++ < MLXSW_EMAD_MAX_RETRY)
goto retry;
out:
dev_kfree_skb(skb);
mlxsw_core->emad.tid++;
return err;
}
static void mlxsw_emad_rx_listener_func(struct sk_buff *skb, u8 local_port,
void *priv)
{
struct mlxsw_core *mlxsw_core = priv;
if (mlxsw_emad_is_resp(skb) &&
mlxsw_core->emad.trans_active &&
mlxsw_emad_get_tid(skb) == mlxsw_core->emad.tid) {
mlxsw_core->emad.resp_skb = skb;
mlxsw_core->emad.trans_active = false;
wake_up(&mlxsw_core->emad.wait);
} else {
dev_kfree_skb(skb);
}
}
static const struct mlxsw_rx_listener mlxsw_emad_rx_listener = {
.func = mlxsw_emad_rx_listener_func,
.local_port = MLXSW_PORT_DONT_CARE,
.trap_id = MLXSW_TRAP_ID_ETHEMAD,
};
static int mlxsw_emad_traps_set(struct mlxsw_core *mlxsw_core)
{
char htgt_pl[MLXSW_REG_HTGT_LEN];
char hpkt_pl[MLXSW_REG_HPKT_LEN];
int err;
mlxsw_reg_htgt_pack(htgt_pl, MLXSW_REG_HTGT_TRAP_GROUP_EMAD);
err = mlxsw_reg_write(mlxsw_core, MLXSW_REG(htgt), htgt_pl);
if (err)
return err;
mlxsw_reg_hpkt_pack(hpkt_pl, MLXSW_REG_HPKT_ACTION_TRAP_TO_CPU,
MLXSW_TRAP_ID_ETHEMAD);
return mlxsw_reg_write(mlxsw_core, MLXSW_REG(hpkt), hpkt_pl);
}
static int mlxsw_emad_init(struct mlxsw_core *mlxsw_core)
{
int err;
/* Set the upper 32 bits of the transaction ID field to a random
* number. This allows us to discard EMADs addressed to other
* devices.
*/
get_random_bytes(&mlxsw_core->emad.tid, 4);
mlxsw_core->emad.tid = mlxsw_core->emad.tid << 32;
init_waitqueue_head(&mlxsw_core->emad.wait);
mlxsw_core->emad.trans_active = false;
mutex_init(&mlxsw_core->emad.lock);
err = mlxsw_core_rx_listener_register(mlxsw_core,
&mlxsw_emad_rx_listener,
mlxsw_core);
if (err)
return err;
err = mlxsw_emad_traps_set(mlxsw_core);
if (err)
goto err_emad_trap_set;
mlxsw_core->emad.use_emad = true;
return 0;
err_emad_trap_set:
mlxsw_core_rx_listener_unregister(mlxsw_core,
&mlxsw_emad_rx_listener,
mlxsw_core);
return err;
}
static void mlxsw_emad_fini(struct mlxsw_core *mlxsw_core)
{
char hpkt_pl[MLXSW_REG_HPKT_LEN];
mlxsw_core->emad.use_emad = false;
mlxsw_reg_hpkt_pack(hpkt_pl, MLXSW_REG_HPKT_ACTION_DISCARD,
MLXSW_TRAP_ID_ETHEMAD);
mlxsw_reg_write(mlxsw_core, MLXSW_REG(hpkt), hpkt_pl);
mlxsw_core_rx_listener_unregister(mlxsw_core,
&mlxsw_emad_rx_listener,
mlxsw_core);
}
static struct sk_buff *mlxsw_emad_alloc(const struct mlxsw_core *mlxsw_core,
u16 reg_len)
{
struct sk_buff *skb;
u16 emad_len;
emad_len = (reg_len + sizeof(u32) + MLXSW_EMAD_ETH_HDR_LEN +
(MLXSW_EMAD_OP_TLV_LEN + MLXSW_EMAD_END_TLV_LEN) *
sizeof(u32) + mlxsw_core->driver->txhdr_len);
if (emad_len > MLXSW_EMAD_MAX_FRAME_LEN)
return NULL;
skb = netdev_alloc_skb(NULL, emad_len);
if (!skb)
return NULL;
memset(skb->data, 0, emad_len);
skb_reserve(skb, emad_len);
return skb;
}
/*****************
* Core functions
*****************/
static int mlxsw_core_rx_stats_dbg_read(struct seq_file *file, void *data)
{
struct mlxsw_core *mlxsw_core = file->private;
struct mlxsw_core_pcpu_stats *p;
u64 rx_packets, rx_bytes;
u64 tmp_rx_packets, tmp_rx_bytes;
u32 rx_dropped, rx_invalid;
unsigned int start;
int i;
int j;
static const char hdr[] =
" NUM RX_PACKETS RX_BYTES RX_DROPPED\n";
seq_printf(file, hdr);
for (i = 0; i < MLXSW_TRAP_ID_MAX; i++) {
rx_packets = 0;
rx_bytes = 0;
rx_dropped = 0;
for_each_possible_cpu(j) {
p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
do {
start = u64_stats_fetch_begin(&p->syncp);
tmp_rx_packets = p->trap_rx_packets[i];
tmp_rx_bytes = p->trap_rx_bytes[i];
} while (u64_stats_fetch_retry(&p->syncp, start));
rx_packets += tmp_rx_packets;
rx_bytes += tmp_rx_bytes;
rx_dropped += p->trap_rx_dropped[i];
}
seq_printf(file, "trap %3d %12llu %12llu %10u\n",
i, rx_packets, rx_bytes, rx_dropped);
}
rx_invalid = 0;
for_each_possible_cpu(j) {
p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
rx_invalid += p->trap_rx_invalid;
}
seq_printf(file, "trap INV %10u\n",
rx_invalid);
for (i = 0; i < MLXSW_PORT_MAX_PORTS; i++) {
rx_packets = 0;
rx_bytes = 0;
rx_dropped = 0;
for_each_possible_cpu(j) {
p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
do {
start = u64_stats_fetch_begin(&p->syncp);
tmp_rx_packets = p->port_rx_packets[i];
tmp_rx_bytes = p->port_rx_bytes[i];
} while (u64_stats_fetch_retry(&p->syncp, start));
rx_packets += tmp_rx_packets;
rx_bytes += tmp_rx_bytes;
rx_dropped += p->port_rx_dropped[i];
}
seq_printf(file, "port %3d %12llu %12llu %10u\n",
i, rx_packets, rx_bytes, rx_dropped);
}
rx_invalid = 0;
for_each_possible_cpu(j) {
p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
rx_invalid += p->port_rx_invalid;
}
seq_printf(file, "port INV %10u\n",
rx_invalid);
return 0;
}
static int mlxsw_core_rx_stats_dbg_open(struct inode *inode, struct file *f)
{
struct mlxsw_core *mlxsw_core = inode->i_private;
return single_open(f, mlxsw_core_rx_stats_dbg_read, mlxsw_core);
}
static const struct file_operations mlxsw_core_rx_stats_dbg_ops = {
.owner = THIS_MODULE,
.open = mlxsw_core_rx_stats_dbg_open,
.release = single_release,
.read = seq_read,
.llseek = seq_lseek
};
static void mlxsw_core_buf_dump_dbg(struct mlxsw_core *mlxsw_core,
const char *buf, size_t size)
{
__be32 *m = (__be32 *) buf;
int i;
int count = size / sizeof(__be32);
for (i = count - 1; i >= 0; i--)
if (m[i])
break;
i++;
count = i ? i : 1;
for (i = 0; i < count; i += 4)
dev_dbg(mlxsw_core->bus_info->dev, "%04x - %08x %08x %08x %08x\n",
i * 4, be32_to_cpu(m[i]), be32_to_cpu(m[i + 1]),
be32_to_cpu(m[i + 2]), be32_to_cpu(m[i + 3]));
}
int mlxsw_core_driver_register(struct mlxsw_driver *mlxsw_driver)
{
spin_lock(&mlxsw_core_driver_list_lock);
list_add_tail(&mlxsw_driver->list, &mlxsw_core_driver_list);
spin_unlock(&mlxsw_core_driver_list_lock);
return 0;
}
EXPORT_SYMBOL(mlxsw_core_driver_register);
void mlxsw_core_driver_unregister(struct mlxsw_driver *mlxsw_driver)
{
spin_lock(&mlxsw_core_driver_list_lock);
list_del(&mlxsw_driver->list);
spin_unlock(&mlxsw_core_driver_list_lock);
}
EXPORT_SYMBOL(mlxsw_core_driver_unregister);
static struct mlxsw_driver *__driver_find(const char *kind)
{
struct mlxsw_driver *mlxsw_driver;
list_for_each_entry(mlxsw_driver, &mlxsw_core_driver_list, list) {
if (strcmp(mlxsw_driver->kind, kind) == 0)
return mlxsw_driver;
}
return NULL;
}
static struct mlxsw_driver *mlxsw_core_driver_get(const char *kind)
{
struct mlxsw_driver *mlxsw_driver;
spin_lock(&mlxsw_core_driver_list_lock);
mlxsw_driver = __driver_find(kind);
if (!mlxsw_driver) {
spin_unlock(&mlxsw_core_driver_list_lock);
request_module(MLXSW_MODULE_ALIAS_PREFIX "%s", kind);
spin_lock(&mlxsw_core_driver_list_lock);
mlxsw_driver = __driver_find(kind);
}
if (mlxsw_driver) {
if (!try_module_get(mlxsw_driver->owner))
mlxsw_driver = NULL;
}
spin_unlock(&mlxsw_core_driver_list_lock);
return mlxsw_driver;
}
static void mlxsw_core_driver_put(const char *kind)
{
struct mlxsw_driver *mlxsw_driver;
spin_lock(&mlxsw_core_driver_list_lock);
mlxsw_driver = __driver_find(kind);
spin_unlock(&mlxsw_core_driver_list_lock);
if (!mlxsw_driver)
return;
module_put(mlxsw_driver->owner);
}
static int mlxsw_core_debugfs_init(struct mlxsw_core *mlxsw_core)
{
const struct mlxsw_bus_info *bus_info = mlxsw_core->bus_info;
mlxsw_core->dbg_dir = debugfs_create_dir(bus_info->device_name,
mlxsw_core_dbg_root);
if (!mlxsw_core->dbg_dir)
return -ENOMEM;
debugfs_create_file("rx_stats", S_IRUGO, mlxsw_core->dbg_dir,
mlxsw_core, &mlxsw_core_rx_stats_dbg_ops);
mlxsw_core->dbg.vsd_blob.data = (void *) &bus_info->vsd;
mlxsw_core->dbg.vsd_blob.size = sizeof(bus_info->vsd);
debugfs_create_blob("vsd", S_IRUGO, mlxsw_core->dbg_dir,
&mlxsw_core->dbg.vsd_blob);
mlxsw_core->dbg.psid_blob.data = (void *) &bus_info->psid;
mlxsw_core->dbg.psid_blob.size = sizeof(bus_info->psid);
debugfs_create_blob("psid", S_IRUGO, mlxsw_core->dbg_dir,
&mlxsw_core->dbg.psid_blob);
return 0;
}
static void mlxsw_core_debugfs_fini(struct mlxsw_core *mlxsw_core)
{
debugfs_remove_recursive(mlxsw_core->dbg_dir);
}
int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
const struct mlxsw_bus *mlxsw_bus,
void *bus_priv)
{
const char *device_kind = mlxsw_bus_info->device_kind;
struct mlxsw_core *mlxsw_core;
struct mlxsw_driver *mlxsw_driver;
size_t alloc_size;
int err;
mlxsw_driver = mlxsw_core_driver_get(device_kind);
if (!mlxsw_driver)
return -EINVAL;
alloc_size = sizeof(*mlxsw_core) + mlxsw_driver->priv_size;
mlxsw_core = kzalloc(alloc_size, GFP_KERNEL);
if (!mlxsw_core) {
err = -ENOMEM;
goto err_core_alloc;
}
INIT_LIST_HEAD(&mlxsw_core->rx_listener_list);
INIT_LIST_HEAD(&mlxsw_core->event_listener_list);
mlxsw_core->driver = mlxsw_driver;
mlxsw_core->bus = mlxsw_bus;
mlxsw_core->bus_priv = bus_priv;
mlxsw_core->bus_info = mlxsw_bus_info;
mlxsw_core->pcpu_stats =
netdev_alloc_pcpu_stats(struct mlxsw_core_pcpu_stats);
if (!mlxsw_core->pcpu_stats) {
err = -ENOMEM;
goto err_alloc_stats;
}
err = mlxsw_bus->init(bus_priv, mlxsw_core, mlxsw_driver->profile);
if (err)
goto err_bus_init;
err = mlxsw_emad_init(mlxsw_core);
if (err)
goto err_emad_init;
err = mlxsw_driver->init(mlxsw_core->driver_priv, mlxsw_core,
mlxsw_bus_info);
if (err)
goto err_driver_init;
err = mlxsw_core_debugfs_init(mlxsw_core);
if (err)
goto err_debugfs_init;
return 0;
err_debugfs_init:
mlxsw_core->driver->fini(mlxsw_core->driver_priv);
err_driver_init:
mlxsw_emad_fini(mlxsw_core);
err_emad_init:
mlxsw_bus->fini(bus_priv);
err_bus_init:
free_percpu(mlxsw_core->pcpu_stats);
err_alloc_stats:
kfree(mlxsw_core);
err_core_alloc:
mlxsw_core_driver_put(device_kind);
return err;
}
EXPORT_SYMBOL(mlxsw_core_bus_device_register);
void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core)
{
const char *device_kind = mlxsw_core->bus_info->device_kind;
mlxsw_core_debugfs_fini(mlxsw_core);
mlxsw_core->driver->fini(mlxsw_core->driver_priv);
mlxsw_emad_fini(mlxsw_core);
mlxsw_core->bus->fini(mlxsw_core->bus_priv);
free_percpu(mlxsw_core->pcpu_stats);
kfree(mlxsw_core);
mlxsw_core_driver_put(device_kind);
}
EXPORT_SYMBOL(mlxsw_core_bus_device_unregister);
static struct mlxsw_core *__mlxsw_core_get(void *driver_priv)
{
return container_of(driver_priv, struct mlxsw_core, driver_priv);
}
bool mlxsw_core_skb_transmit_busy(void *driver_priv,
const struct mlxsw_tx_info *tx_info)
{
struct mlxsw_core *mlxsw_core = __mlxsw_core_get(driver_priv);
return mlxsw_core->bus->skb_transmit_busy(mlxsw_core->bus_priv,
tx_info);
}
EXPORT_SYMBOL(mlxsw_core_skb_transmit_busy);
int mlxsw_core_skb_transmit(void *driver_priv, struct sk_buff *skb,
const struct mlxsw_tx_info *tx_info)
{
struct mlxsw_core *mlxsw_core = __mlxsw_core_get(driver_priv);
return mlxsw_core->bus->skb_transmit(mlxsw_core->bus_priv, skb,
tx_info);
}
EXPORT_SYMBOL(mlxsw_core_skb_transmit);
static bool __is_rx_listener_equal(const struct mlxsw_rx_listener *rxl_a,
const struct mlxsw_rx_listener *rxl_b)
{
return (rxl_a->func == rxl_b->func &&
rxl_a->local_port == rxl_b->local_port &&
rxl_a->trap_id == rxl_b->trap_id);
}
static struct mlxsw_rx_listener_item *
__find_rx_listener_item(struct mlxsw_core *mlxsw_core,
const struct mlxsw_rx_listener *rxl,
void *priv)
{
struct mlxsw_rx_listener_item *rxl_item;
list_for_each_entry(rxl_item, &mlxsw_core->rx_listener_list, list) {
if (__is_rx_listener_equal(&rxl_item->rxl, rxl) &&
rxl_item->priv == priv)
return rxl_item;
}
return NULL;
}
int mlxsw_core_rx_listener_register(struct mlxsw_core *mlxsw_core,
const struct mlxsw_rx_listener *rxl,
void *priv)
{
struct mlxsw_rx_listener_item *rxl_item;
rxl_item = __find_rx_listener_item(mlxsw_core, rxl, priv);
if (rxl_item)
return -EEXIST;
rxl_item = kmalloc(sizeof(*rxl_item), GFP_KERNEL);
if (!rxl_item)
return -ENOMEM;
rxl_item->rxl = *rxl;
rxl_item->priv = priv;
list_add_rcu(&rxl_item->list, &mlxsw_core->rx_listener_list);
return 0;
}
EXPORT_SYMBOL(mlxsw_core_rx_listener_register);
void mlxsw_core_rx_listener_unregister(struct mlxsw_core *mlxsw_core,
const struct mlxsw_rx_listener *rxl,
void *priv)
{
struct mlxsw_rx_listener_item *rxl_item;
rxl_item = __find_rx_listener_item(mlxsw_core, rxl, priv);
if (!rxl_item)
return;
list_del_rcu(&rxl_item->list);
synchronize_rcu();
kfree(rxl_item);
}
EXPORT_SYMBOL(mlxsw_core_rx_listener_unregister);
static void mlxsw_core_event_listener_func(struct sk_buff *skb, u8 local_port,
void *priv)
{
struct mlxsw_event_listener_item *event_listener_item = priv;
struct mlxsw_reg_info reg;
char *payload;
char *op_tlv = mlxsw_emad_op_tlv(skb);
char *reg_tlv = mlxsw_emad_reg_tlv(skb);
reg.id = mlxsw_emad_op_tlv_register_id_get(op_tlv);
reg.len = (mlxsw_emad_reg_tlv_len_get(reg_tlv) - 1) * sizeof(u32);
payload = mlxsw_emad_reg_payload(op_tlv);
event_listener_item->el.func(®, payload, event_listener_item->priv);
dev_kfree_skb(skb);
}
static bool __is_event_listener_equal(const struct mlxsw_event_listener *el_a,
const struct mlxsw_event_listener *el_b)
{
return (el_a->func == el_b->func &&
el_a->trap_id == el_b->trap_id);
}
static struct mlxsw_event_listener_item *
__find_event_listener_item(struct mlxsw_core *mlxsw_core,
const struct mlxsw_event_listener *el,
void *priv)
{
struct mlxsw_event_listener_item *el_item;
list_for_each_entry(el_item, &mlxsw_core->event_listener_list, list) {
if (__is_event_listener_equal(&el_item->el, el) &&
el_item->priv == priv)
return el_item;
}
return NULL;
}
int mlxsw_core_event_listener_register(struct mlxsw_core *mlxsw_core,
const struct mlxsw_event_listener *el,
void *priv)
{
int err;
struct mlxsw_event_listener_item *el_item;
const struct mlxsw_rx_listener rxl = {
.func = mlxsw_core_event_listener_func,
.local_port = MLXSW_PORT_DONT_CARE,
.trap_id = el->trap_id,
};
el_item = __find_event_listener_item(mlxsw_core, el, priv);
if (el_item)
return -EEXIST;
el_item = kmalloc(sizeof(*el_item), GFP_KERNEL);
if (!el_item)
return -ENOMEM;
el_item->el = *el;
el_item->priv = priv;
err = mlxsw_core_rx_listener_register(mlxsw_core, &rxl, el_item);
if (err)
goto err_rx_listener_register;
/* No reason to save item if we did not manage to register an RX
* listener for it.
*/
list_add_rcu(&el_item->list, &mlxsw_core->event_listener_list);
return 0;
err_rx_listener_register:
kfree(el_item);
return err;
}
EXPORT_SYMBOL(mlxsw_core_event_listener_register);
void mlxsw_core_event_listener_unregister(struct mlxsw_core *mlxsw_core,
const struct mlxsw_event_listener *el,
void *priv)
{
struct mlxsw_event_listener_item *el_item;
const struct mlxsw_rx_listener rxl = {
.func = mlxsw_core_event_listener_func,
.local_port = MLXSW_PORT_DONT_CARE,
.trap_id = el->trap_id,
};
el_item = __find_event_listener_item(mlxsw_core, el, priv);
if (!el_item)
return;
mlxsw_core_rx_listener_unregister(mlxsw_core, &rxl, el_item);
list_del(&el_item->list);
kfree(el_item);
}
EXPORT_SYMBOL(mlxsw_core_event_listener_unregister);
static int mlxsw_core_reg_access_emad(struct mlxsw_core *mlxsw_core,
const struct mlxsw_reg_info *reg,
char *payload,
enum mlxsw_core_reg_access_type type)
{
int err;
char *op_tlv;
struct sk_buff *skb;
struct mlxsw_tx_info tx_info = {
.local_port = MLXSW_PORT_CPU_PORT,
.is_emad = true,
};
skb = mlxsw_emad_alloc(mlxsw_core, reg->len);
if (!skb)
return -ENOMEM;
mlxsw_emad_construct(skb, reg, payload, type, mlxsw_core);
mlxsw_core->driver->txhdr_construct(skb, &tx_info);
dev_dbg(mlxsw_core->bus_info->dev, "EMAD send (tid=%llx)\n",
mlxsw_core->emad.tid);
mlxsw_core_buf_dump_dbg(mlxsw_core, skb->data, skb->len);
err = mlxsw_emad_transmit(mlxsw_core, skb, &tx_info);
if (!err) {
op_tlv = mlxsw_emad_op_tlv(mlxsw_core->emad.resp_skb);
memcpy(payload, mlxsw_emad_reg_payload(op_tlv),
reg->len);
dev_dbg(mlxsw_core->bus_info->dev, "EMAD recv (tid=%llx)\n",
mlxsw_core->emad.tid - 1);
mlxsw_core_buf_dump_dbg(mlxsw_core,
mlxsw_core->emad.resp_skb->data,
mlxsw_core->emad.resp_skb->len);
dev_kfree_skb(mlxsw_core->emad.resp_skb);
}
return err;
}
static int mlxsw_core_reg_access_cmd(struct mlxsw_core *mlxsw_core,
const struct mlxsw_reg_info *reg,
char *payload,
enum mlxsw_core_reg_access_type type)
{
int err, n_retry;
char *in_mbox, *out_mbox, *tmp;
in_mbox = mlxsw_cmd_mbox_alloc();
if (!in_mbox)
return -ENOMEM;
out_mbox = mlxsw_cmd_mbox_alloc();
if (!out_mbox) {
err = -ENOMEM;
goto free_in_mbox;
}
mlxsw_emad_pack_op_tlv(in_mbox, reg, type, mlxsw_core);
tmp = in_mbox + MLXSW_EMAD_OP_TLV_LEN * sizeof(u32);
mlxsw_emad_pack_reg_tlv(tmp, reg, payload);
n_retry = 0;
retry:
err = mlxsw_cmd_access_reg(mlxsw_core, in_mbox, out_mbox);
if (!err) {
err = mlxsw_emad_process_status(mlxsw_core, out_mbox);
if (err == -EAGAIN && n_retry++ < MLXSW_EMAD_MAX_RETRY)
goto retry;
}
if (!err)
memcpy(payload, mlxsw_emad_reg_payload(out_mbox),
reg->len);
mlxsw_core->emad.tid++;
mlxsw_cmd_mbox_free(out_mbox);
free_in_mbox:
mlxsw_cmd_mbox_free(in_mbox);
return err;
}
static int mlxsw_core_reg_access(struct mlxsw_core *mlxsw_core,
const struct mlxsw_reg_info *reg,
char *payload,
enum mlxsw_core_reg_access_type type)
{
u64 cur_tid;
int err;
if (mutex_lock_interruptible(&mlxsw_core->emad.lock)) {
dev_err(mlxsw_core->bus_info->dev, "Reg access interrupted (reg_id=%x(%s),type=%s)\n",
reg->id, mlxsw_reg_id_str(reg->id),
mlxsw_core_reg_access_type_str(type));
return -EINTR;
}
cur_tid = mlxsw_core->emad.tid;
dev_dbg(mlxsw_core->bus_info->dev, "Reg access (tid=%llx,reg_id=%x(%s),type=%s)\n",
cur_tid, reg->id, mlxsw_reg_id_str(reg->id),
mlxsw_core_reg_access_type_str(type));
/* During initialization EMAD interface is not available to us,
* so we default to command interface. We switch to EMAD interface
* after setting the appropriate traps.
*/
if (!mlxsw_core->emad.use_emad)
err = mlxsw_core_reg_access_cmd(mlxsw_core, reg,
payload, type);
else
err = mlxsw_core_reg_access_emad(mlxsw_core, reg,
payload, type);
if (err)
dev_err(mlxsw_core->bus_info->dev, "Reg access failed (tid=%llx,reg_id=%x(%s),type=%s)\n",
cur_tid, reg->id, mlxsw_reg_id_str(reg->id),
mlxsw_core_reg_access_type_str(type));
mutex_unlock(&mlxsw_core->emad.lock);
return err;
}
int mlxsw_reg_query(struct mlxsw_core *mlxsw_core,
const struct mlxsw_reg_info *reg, char *payload)
{
return mlxsw_core_reg_access(mlxsw_core, reg, payload,
MLXSW_CORE_REG_ACCESS_TYPE_QUERY);
}
EXPORT_SYMBOL(mlxsw_reg_query);
int mlxsw_reg_write(struct mlxsw_core *mlxsw_core,
const struct mlxsw_reg_info *reg, char *payload)
{
return mlxsw_core_reg_access(mlxsw_core, reg, payload,
MLXSW_CORE_REG_ACCESS_TYPE_WRITE);
}
EXPORT_SYMBOL(mlxsw_reg_write);
void mlxsw_core_skb_receive(struct mlxsw_core *mlxsw_core, struct sk_buff *skb,
struct mlxsw_rx_info *rx_info)
{
struct mlxsw_rx_listener_item *rxl_item;
const struct mlxsw_rx_listener *rxl;
struct mlxsw_core_pcpu_stats *pcpu_stats;
u8 local_port = rx_info->sys_port;
bool found = false;
dev_dbg_ratelimited(mlxsw_core->bus_info->dev, "%s: sys_port = %d, trap_id = 0x%x\n",
__func__, rx_info->sys_port, rx_info->trap_id);
if ((rx_info->trap_id >= MLXSW_TRAP_ID_MAX) ||
(local_port >= MLXSW_PORT_MAX_PORTS))
goto drop;
rcu_read_lock();
list_for_each_entry_rcu(rxl_item, &mlxsw_core->rx_listener_list, list) {
rxl = &rxl_item->rxl;
if ((rxl->local_port == MLXSW_PORT_DONT_CARE ||
rxl->local_port == local_port) &&
rxl->trap_id == rx_info->trap_id) {
found = true;
break;
}
}
rcu_read_unlock();
if (!found)
goto drop;
pcpu_stats = this_cpu_ptr(mlxsw_core->pcpu_stats);
u64_stats_update_begin(&pcpu_stats->syncp);
pcpu_stats->port_rx_packets[local_port]++;
pcpu_stats->port_rx_bytes[local_port] += skb->len;
pcpu_stats->trap_rx_packets[rx_info->trap_id]++;
pcpu_stats->trap_rx_bytes[rx_info->trap_id] += skb->len;
u64_stats_update_end(&pcpu_stats->syncp);
rxl->func(skb, local_port, rxl_item->priv);
return;
drop:
if (rx_info->trap_id >= MLXSW_TRAP_ID_MAX)
this_cpu_inc(mlxsw_core->pcpu_stats->trap_rx_invalid);
else
this_cpu_inc(mlxsw_core->pcpu_stats->trap_rx_dropped[rx_info->trap_id]);
if (local_port >= MLXSW_PORT_MAX_PORTS)
this_cpu_inc(mlxsw_core->pcpu_stats->port_rx_invalid);
else
this_cpu_inc(mlxsw_core->pcpu_stats->port_rx_dropped[local_port]);
dev_kfree_skb(skb);
}
EXPORT_SYMBOL(mlxsw_core_skb_receive);
int mlxsw_cmd_exec(struct mlxsw_core *mlxsw_core, u16 opcode, u8 opcode_mod,
u32 in_mod, bool out_mbox_direct,
char *in_mbox, size_t in_mbox_size,
char *out_mbox, size_t out_mbox_size)
{
u8 status;
int err;
BUG_ON(in_mbox_size % sizeof(u32) || out_mbox_size % sizeof(u32));
if (!mlxsw_core->bus->cmd_exec)
return -EOPNOTSUPP;
dev_dbg(mlxsw_core->bus_info->dev, "Cmd exec (opcode=%x(%s),opcode_mod=%x,in_mod=%x)\n",
opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod, in_mod);
if (in_mbox) {
dev_dbg(mlxsw_core->bus_info->dev, "Input mailbox:\n");
mlxsw_core_buf_dump_dbg(mlxsw_core, in_mbox, in_mbox_size);
}
err = mlxsw_core->bus->cmd_exec(mlxsw_core->bus_priv, opcode,
opcode_mod, in_mod, out_mbox_direct,
in_mbox, in_mbox_size,
out_mbox, out_mbox_size, &status);
if (err == -EIO && status != MLXSW_CMD_STATUS_OK) {
dev_err(mlxsw_core->bus_info->dev, "Cmd exec failed (opcode=%x(%s),opcode_mod=%x,in_mod=%x,status=%x(%s))\n",
opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod,
in_mod, status, mlxsw_cmd_status_str(status));
} else if (err == -ETIMEDOUT) {
dev_err(mlxsw_core->bus_info->dev, "Cmd exec timed-out (opcode=%x(%s),opcode_mod=%x,in_mod=%x)\n",
opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod,
in_mod);
}
if (!err && out_mbox) {
dev_dbg(mlxsw_core->bus_info->dev, "Output mailbox:\n");
mlxsw_core_buf_dump_dbg(mlxsw_core, out_mbox, out_mbox_size);
}
return err;
}
EXPORT_SYMBOL(mlxsw_cmd_exec);
static int __init mlxsw_core_module_init(void)
{
mlxsw_core_dbg_root = debugfs_create_dir(mlxsw_core_driver_name, NULL);
if (!mlxsw_core_dbg_root)
return -ENOMEM;
return 0;
}
static void __exit mlxsw_core_module_exit(void)
{
debugfs_remove_recursive(mlxsw_core_dbg_root);
}
module_init(mlxsw_core_module_init);
module_exit(mlxsw_core_module_exit);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
MODULE_DESCRIPTION("Mellanox switch device core driver");