kkumar-fk

unsigned int index = reciprocal_scale(phash, num_socks);

return reuse->socks[index];

kkumar-fk

$ ss -tlnpe | grep :45000
LISTEN     0     128    *:45000   *:* users:(("my_server",pid=3020,fd=3),("my_server",pid=3019,fd=3)) ino:3854904087 sk:37d5a0

kkumar-fk

$ ss -tlnpe | grep :45000
LISTEN     0     128    *:45000                *:*  users:(("my_server",pid=1975,fd=3)) ino:3854935788 sk:37d59c
LISTEN     0     128    *:45000                *:*  users:(("my_server",pid=1974,fd=3)) ino:3854935786 sk:37d59d

kkumar-fk

struct sock *inet_csk_accept(struct sock *sk)
{
    struct sock *newsk = NULL;   /* client socket */

    /* Make sure that this socket is listening, and that it has something pending. */
    lock_sock(sk);
    if (sk->sk_state == TCP_LISTEN)
        if ("there are completed connections waiting to be accepted")
            newsk = get_first_connection(sk);
    release_sock(sk);

kkumar-fk

server.sin_family  = AF_INET;
server.sin_port    = htons(SERVER_PORT);
bcopy(server_ent->h_addr, &server.sin_addr.s_addr, server_ent->h_length);

/* Connect to server, and set the socket's destination IP address and port#
 * based on above parameters. Also, request the kernel to automatically set
 * the Source IP and port# if the application did not call bind() prior to connect().
 */
connect(fd, (struct sockaddr *)&server, sizeof server);

kkumar-fk

srv_addr.sin_family        = AF_INET;
srv_addr.sin_addr.s_addr   = INADDR_ANY;
srv_addr.sin_port          = htons(SERVER_PORT);
bind(fd, &srv_addr, sizeof srv_addr);

kkumar-fk

const struct linger opt = { .l_onoff = 1, .l_linger = 0 };

setsockopt(fd, SOL_SOCKET, SO_LINGER, &opt, sizeof opt);
close(fd);

kkumar-fk

1. Create a socket:
    server_fd = socket(...);
2. Bind to a well known IP address and port#:
    ret = bind(server_fd, ...);
3. Mark the socket as passive by changing it's state to LISTEN:
    ret = listen(server_fd, ...);
4. Wait for a client to connect, and get a reference file descriptor:
    client_fd = accept(server_fd, ...);

kkumar-fk

entry:                   |  __x64_sys_sendto() {
entry:                   |    __sys_sendto() {
entry:                   |      sockfd_lookup_light() {
exit:         0.722 us   |      }
entry:                   |      sock_sendmsg() {
entry:                   |        security_socket_sendmsg() {
entry:                   |          apparmor_socket_sendmsg() {
exit:         0.763 us   |          }
exit:         1.069 us   |        }
entry:                   |        inet_sendmsg() {

kkumar-fk

  <interface type='network'>
    <mac address='52:54:00:00:12:53'/>
    <source network='enp66s0f0_br'/>
    <target dev='tap01'/>
    <model type='virtio'/>
    <driver name='vhost' queues='4'/>
    <link state='down'/>
    <teaming type='persistent'/>
    <alias name='ua-backup0'/>
  </interface>