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numam-dpdk/drivers/net/mlx4/mlx4_mp.c
Yongseok Koh 0b259b8e96 net/mlx4: enable secondary process to register DMA memory 
The Memory Region (MR) for DMA memory can't be created from secondary
process due to lib/driver limitation. Whenever it is needed, secondary
process can make a request to primary process through the EAL IPC
channel (rte_mp_msg) which is established on initialization. Once a MR
is created by primary process, it is immediately visible to secondary
process because the MR list is global per a device. Thus, secondary
process can look up the list after the request is successfully returned.

Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
Acked-by: Shahaf Shuler <shahafs@mellanox.com>
2019-04-05 17:45:22 +02:00

355 lines
8.6 KiB
C
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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright 2019 6WIND S.A.
* Copyright 2019 Mellanox Technologies, Ltd
*/
#include <assert.h>
#include <stdio.h>
#include <time.h>
#include <rte_eal.h>
#include <rte_ethdev_driver.h>
#include <rte_string_fns.h>
#include "mlx4.h"
#include "mlx4_rxtx.h"
#include "mlx4_utils.h"
/**
* Initialize IPC message.
*
* @param[in] dev
* Pointer to Ethernet structure.
* @param[out] msg
* Pointer to message to fill in.
* @param[in] type
* Message type.
*/
static inline void
mp_init_msg(struct rte_eth_dev *dev, struct rte_mp_msg *msg,
enum mlx4_mp_req_type type)
{
struct mlx4_mp_param *param = (struct mlx4_mp_param *)msg->param;
memset(msg, 0, sizeof(*msg));
strlcpy(msg->name, MLX4_MP_NAME, sizeof(msg->name));
msg->len_param = sizeof(*param);
param->type = type;
param->port_id = dev->data->port_id;
}
/**
* IPC message handler of primary process.
*
* @param[in] dev
* Pointer to Ethernet structure.
* @param[in] peer
* Pointer to the peer socket path.
*
* @return
* 0 on success, negative errno value otherwise and rte_errno is set.
*/
static int
mp_primary_handle(const struct rte_mp_msg *mp_msg, const void *peer)
{
struct rte_mp_msg mp_res;
struct mlx4_mp_param *res = (struct mlx4_mp_param *)mp_res.param;
const struct mlx4_mp_param *param =
(const struct mlx4_mp_param *)mp_msg->param;
struct rte_eth_dev *dev;
struct mlx4_priv *priv;
struct mlx4_mr_cache entry;
uint32_t lkey;
int ret;
assert(rte_eal_process_type() == RTE_PROC_PRIMARY);
if (!rte_eth_dev_is_valid_port(param->port_id)) {
rte_errno = ENODEV;
ERROR("port %u invalid port ID", param->port_id);
return -rte_errno;
}
dev = &rte_eth_devices[param->port_id];
priv = dev->data->dev_private;
switch (param->type) {
case MLX4_MP_REQ_CREATE_MR:
mp_init_msg(dev, &mp_res, param->type);
lkey = mlx4_mr_create_primary(dev, &entry, param->args.addr);
if (lkey == UINT32_MAX)
res->result = -rte_errno;
ret = rte_mp_reply(&mp_res, peer);
break;
case MLX4_MP_REQ_VERBS_CMD_FD:
mp_init_msg(dev, &mp_res, param->type);
mp_res.num_fds = 1;
mp_res.fds[0] = priv->ctx->cmd_fd;
res->result = 0;
ret = rte_mp_reply(&mp_res, peer);
break;
default:
rte_errno = EINVAL;
ERROR("port %u invalid mp request type", dev->data->port_id);
return -rte_errno;
}
return ret;
}
/**
* IPC message handler of a secondary process.
*
* @param[in] dev
* Pointer to Ethernet structure.
* @param[in] peer
* Pointer to the peer socket path.
*
* @return
* 0 on success, a negative errno value otherwise and rte_errno is set.
*/
static int
mp_secondary_handle(const struct rte_mp_msg *mp_msg, const void *peer)
{
struct rte_mp_msg mp_res;
struct mlx4_mp_param *res = (struct mlx4_mp_param *)mp_res.param;
const struct mlx4_mp_param *param =
(const struct mlx4_mp_param *)mp_msg->param;
struct rte_eth_dev *dev;
int ret;
assert(rte_eal_process_type() == RTE_PROC_SECONDARY);
if (!rte_eth_dev_is_valid_port(param->port_id)) {
rte_errno = ENODEV;
ERROR("port %u invalid port ID", param->port_id);
return -rte_errno;
}
dev = &rte_eth_devices[param->port_id];
switch (param->type) {
case MLX4_MP_REQ_START_RXTX:
INFO("port %u starting datapath", dev->data->port_id);
rte_mb();
dev->tx_pkt_burst = mlx4_tx_burst;
dev->rx_pkt_burst = mlx4_rx_burst;
mp_init_msg(dev, &mp_res, param->type);
res->result = 0;
ret = rte_mp_reply(&mp_res, peer);
break;
case MLX4_MP_REQ_STOP_RXTX:
INFO("port %u stopping datapath", dev->data->port_id);
dev->tx_pkt_burst = mlx4_tx_burst_removed;
dev->rx_pkt_burst = mlx4_rx_burst_removed;
rte_mb();
mp_init_msg(dev, &mp_res, param->type);
res->result = 0;
ret = rte_mp_reply(&mp_res, peer);
break;
default:
rte_errno = EINVAL;
ERROR("port %u invalid mp request type", dev->data->port_id);
return -rte_errno;
}
return ret;
}
/**
* Broadcast request of stopping/starting data-path to secondary processes.
*
* @param[in] dev
* Pointer to Ethernet structure.
* @param[in] type
* Request type.
*/
static void
mp_req_on_rxtx(struct rte_eth_dev *dev, enum mlx4_mp_req_type type)
{
struct rte_mp_msg mp_req;
struct rte_mp_msg *mp_res;
struct rte_mp_reply mp_rep;
struct mlx4_mp_param *res __rte_unused;
struct timespec ts = {.tv_sec = MLX4_MP_REQ_TIMEOUT_SEC, .tv_nsec = 0};
int ret;
int i;
assert(rte_eal_process_type() == RTE_PROC_PRIMARY);
if (!mlx4_shared_data->secondary_cnt)
return;
if (type != MLX4_MP_REQ_START_RXTX && type != MLX4_MP_REQ_STOP_RXTX) {
ERROR("port %u unknown request (req_type %d)",
dev->data->port_id, type);
return;
}
mp_init_msg(dev, &mp_req, type);
ret = rte_mp_request_sync(&mp_req, &mp_rep, &ts);
if (ret) {
ERROR("port %u failed to request stop/start Rx/Tx (%d)",
dev->data->port_id, type);
goto exit;
}
if (mp_rep.nb_sent != mp_rep.nb_received) {
ERROR("port %u not all secondaries responded (req_type %d)",
dev->data->port_id, type);
goto exit;
}
for (i = 0; i < mp_rep.nb_received; i++) {
mp_res = &mp_rep.msgs[i];
res = (struct mlx4_mp_param *)mp_res->param;
if (res->result) {
ERROR("port %u request failed on secondary #%d",
dev->data->port_id, i);
goto exit;
}
}
exit:
free(mp_rep.msgs);
}
/**
* Broadcast request of starting data-path to secondary processes. The request
* is synchronous.
*
* @param[in] dev
* Pointer to Ethernet structure.
*/
void
mlx4_mp_req_start_rxtx(struct rte_eth_dev *dev)
{
mp_req_on_rxtx(dev, MLX4_MP_REQ_START_RXTX);
}
/**
* Broadcast request of stopping data-path to secondary processes. The request
* is synchronous.
*
* @param[in] dev
* Pointer to Ethernet structure.
*/
void
mlx4_mp_req_stop_rxtx(struct rte_eth_dev *dev)
{
mp_req_on_rxtx(dev, MLX4_MP_REQ_STOP_RXTX);
}
/**
* Request Memory Region creation to the primary process.
*
* @param[in] dev
* Pointer to Ethernet structure.
* @param addr
* Target virtual address to register.
*
* @return
* 0 on success, a negative errno value otherwise and rte_errno is set.
*/
int
mlx4_mp_req_mr_create(struct rte_eth_dev *dev, uintptr_t addr)
{
struct rte_mp_msg mp_req;
struct rte_mp_msg *mp_res;
struct rte_mp_reply mp_rep;
struct mlx4_mp_param *req = (struct mlx4_mp_param *)mp_req.param;
struct mlx4_mp_param *res;
struct timespec ts = {.tv_sec = MLX4_MP_REQ_TIMEOUT_SEC, .tv_nsec = 0};
int ret;
assert(rte_eal_process_type() == RTE_PROC_SECONDARY);
mp_init_msg(dev, &mp_req, MLX4_MP_REQ_CREATE_MR);
req->args.addr = addr;
ret = rte_mp_request_sync(&mp_req, &mp_rep, &ts);
if (ret) {
ERROR("port %u request to primary process failed",
dev->data->port_id);
return -rte_errno;
}
assert(mp_rep.nb_received == 1);
mp_res = &mp_rep.msgs[0];
res = (struct mlx4_mp_param *)mp_res->param;
ret = res->result;
if (ret)
rte_errno = -ret;
free(mp_rep.msgs);
return ret;
}
/**
* IPC message handler of primary process.
*
* @param[in] dev
* Pointer to Ethernet structure.
*
* @return
* fd on success, a negative errno value otherwise and rte_errno is set.
*/
int
mlx4_mp_req_verbs_cmd_fd(struct rte_eth_dev *dev)
{
struct rte_mp_msg mp_req;
struct rte_mp_msg *mp_res;
struct rte_mp_reply mp_rep;
struct mlx4_mp_param *res;
struct timespec ts = {.tv_sec = MLX4_MP_REQ_TIMEOUT_SEC, .tv_nsec = 0};
int ret;
assert(rte_eal_process_type() == RTE_PROC_SECONDARY);
mp_init_msg(dev, &mp_req, MLX4_MP_REQ_VERBS_CMD_FD);
ret = rte_mp_request_sync(&mp_req, &mp_rep, &ts);
if (ret) {
ERROR("port %u request to primary process failed",
dev->data->port_id);
return -rte_errno;
}
assert(mp_rep.nb_received == 1);
mp_res = &mp_rep.msgs[0];
res = (struct mlx4_mp_param *)mp_res->param;
if (res->result) {
rte_errno = -res->result;
ERROR("port %u failed to get command FD from primary process",
dev->data->port_id);
ret = -rte_errno;
goto exit;
}
assert(mp_res->num_fds == 1);
ret = mp_res->fds[0];
DEBUG("port %u command FD from primary is %d",
dev->data->port_id, ret);
exit:
free(mp_rep.msgs);
return ret;
}
/**
* Initialize by primary process.
*/
void
mlx4_mp_init_primary(void)
{
assert(rte_eal_process_type() == RTE_PROC_PRIMARY);
rte_mp_action_register(MLX4_MP_NAME, mp_primary_handle);
}
/**
* Un-initialize by primary process.
*/
void
mlx4_mp_uninit_primary(void)
{
assert(rte_eal_process_type() == RTE_PROC_PRIMARY);
rte_mp_action_unregister(MLX4_MP_NAME);
}
/**
* Initialize by secondary process.
*/
void
mlx4_mp_init_secondary(void)
{
assert(rte_eal_process_type() == RTE_PROC_SECONDARY);
rte_mp_action_register(MLX4_MP_NAME, mp_secondary_handle);
}
/**
* Un-initialize by secondary process.
*/
void
mlx4_mp_uninit_secondary(void)
{
assert(rte_eal_process_type() == RTE_PROC_SECONDARY);
rte_mp_action_unregister(MLX4_MP_NAME);
}
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