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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright 2019 Mellanox Technologies, Ltd
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include "rte_eal.h"
#include "mlx5_utils.h"
#include "mlx5.h"
/* PMD socket service for tools. */
int server_socket; /* Unix socket for primary process. */
struct rte_intr_handle server_intr_handle; /* Interrupt handler. */
static void
mlx5_pmd_make_path(struct sockaddr_un *addr, int pid)
{
snprintf(addr->sun_path, sizeof(addr->sun_path), "/var/tmp/dpdk_%s_%d",
MLX5_DRIVER_NAME, pid);
}
/**
* Handle server pmd socket interrupts.
*/
static void
mlx5_pmd_socket_handle(void *cb __rte_unused)
{
int conn_sock;
int ret = -1;
struct cmsghdr *cmsg = NULL;
int data;
char buf[CMSG_SPACE(sizeof(int))] = { 0 };
struct iovec io = {
.iov_base = &data,
.iov_len = sizeof(data),
};
struct msghdr msg = {
.msg_iov = &io,
.msg_iovlen = 1,
.msg_control = buf,
.msg_controllen = sizeof(buf),
};
uint16_t port_id;
int fd;
FILE *file = NULL;
struct rte_eth_dev *dev;
/* Accept the connection from the client. */
conn_sock = accept(server_socket, NULL, NULL);
if (conn_sock < 0) {
DRV_LOG(WARNING, "connection failed: %s", strerror(errno));
return;
}
ret = recvmsg(conn_sock, &msg, MSG_WAITALL);
if (ret < 0) {
DRV_LOG(WARNING, "wrong message received: %s",
strerror(errno));
goto error;
}
/* Receive file descriptor. */
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg == NULL || cmsg->cmsg_type != SCM_RIGHTS ||
cmsg->cmsg_len < sizeof(int)) {
DRV_LOG(WARNING, "invalid file descriptor message");
goto error;
}
memcpy(&fd, CMSG_DATA(cmsg), sizeof(fd));
file = fdopen(fd, "w");
if (!file) {
DRV_LOG(WARNING, "Failed to open file");
goto error;
}
/* Receive port number. */
if (msg.msg_iovlen != 1 || msg.msg_iov->iov_len < sizeof(uint16_t)) {
DRV_LOG(WARNING, "wrong port number message");
goto error;
}
memcpy(&port_id, msg.msg_iov->iov_base, sizeof(port_id));
if (!rte_eth_dev_is_valid_port(port_id)) {
DRV_LOG(WARNING, "Invalid port %u", port_id);
goto error;
}
/* Dump flow. */
dev = &rte_eth_devices[port_id];
ret = mlx5_flow_dev_dump(dev, file, NULL);
/* Set-up the ancillary data and reply. */
msg.msg_controllen = 0;
msg.msg_control = NULL;
msg.msg_iovlen = 1;
msg.msg_iov = &io;
data = -ret;
io.iov_len = sizeof(data);
io.iov_base = &data;
do {
ret = sendmsg(conn_sock, &msg, 0);
} while (ret < 0 && errno == EINTR);
if (ret < 0)
DRV_LOG(WARNING, "failed to send response %s",
strerror(errno));
error:
if (conn_sock > 0)
close(conn_sock);
if (file)
fclose(file);
}
/**
* Install interrupt handler.
*
* @param dev
* Pointer to Ethernet device.
* @return
* 0 on success, a negative errno value otherwise.
*/
static int
mlx5_pmd_interrupt_handler_install(void)
{
MLX5_ASSERT(server_socket);
server_intr_handle.fd = server_socket;
server_intr_handle.type = RTE_INTR_HANDLE_EXT;
return rte_intr_callback_register(&server_intr_handle,
mlx5_pmd_socket_handle, NULL);
}
/**
* Uninstall interrupt handler.
*/
static void
mlx5_pmd_interrupt_handler_uninstall(void)
{
if (server_socket) {
mlx5_intr_callback_unregister(&server_intr_handle,
mlx5_pmd_socket_handle,
NULL);
}
server_intr_handle.fd = 0;
server_intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
}
/**
* Initialise the socket to communicate with the secondary process
*
* @param[in] dev
* Pointer to Ethernet device.
*
* @return
* 0 on success, a negative value otherwise.
*/
int
mlx5_pmd_socket_init(void)
{
struct sockaddr_un sun = {
.sun_family = AF_UNIX,
};
int ret = -1;
int flags;
MLX5_ASSERT(rte_eal_process_type() == RTE_PROC_PRIMARY);
if (server_socket)
return 0;
/*
* Initialize the socket to communicate with the secondary
* process.
*/
ret = socket(AF_UNIX, SOCK_STREAM, 0);
if (ret < 0) {
DRV_LOG(WARNING, "Failed to open mlx5 socket: %s",
strerror(errno));
goto error;
}
server_socket = ret;
flags = fcntl(server_socket, F_GETFL, 0);
if (flags == -1)
goto error;
ret = fcntl(server_socket, F_SETFL, flags | O_NONBLOCK);
if (ret < 0)
goto error;
mlx5_pmd_make_path(&sun, getpid());
remove(sun.sun_path);
ret = bind(server_socket, (const struct sockaddr *)&sun, sizeof(sun));
if (ret < 0) {
DRV_LOG(WARNING,
"cannot bind mlx5 socket: %s", strerror(errno));
goto close;
}
ret = listen(server_socket, 0);
if (ret < 0) {
DRV_LOG(WARNING, "cannot listen on mlx5 socket: %s",
strerror(errno));
goto close;
}
if (mlx5_pmd_interrupt_handler_install()) {
DRV_LOG(WARNING, "cannot register interrupt handler for mlx5 socket: %s",
strerror(errno));
goto close;
}
return 0;
close:
remove(sun.sun_path);
error:
claim_zero(close(server_socket));
server_socket = 0;
DRV_LOG(ERR, "Cannot initialize socket: %s", strerror(errno));
return -errno;
}
/**
* Un-Initialize the pmd socket
*/
RTE_FINI(mlx5_pmd_socket_uninit)
{
if (!server_socket)
return;
mlx5_pmd_interrupt_handler_uninstall();
claim_zero(close(server_socket));
server_socket = 0;
MKSTR(path, "/var/tmp/dpdk_%s_%d", MLX5_DRIVER_NAME, getpid());
claim_zero(remove(path));
}
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