This package implements a face using socket as transport.
socketFace type represents a socket face. See face creation "socket face" section for locator syntax.
This package accepts any Go net.Conn instance, which could be either stream-oriented or datagram-oriented.
It reuses the functionality implemented in socketransport package.
That includes receiving and sending packets, and redialing failed stream-oriented sockets.
RX logic is implemented in rxConns type.
Each face has a goroutine that reads one packet at a time from the sockettransport.Transport into the dataroom of a DPDK mbuf.
Upon successfully receiving a packet, the mbuf is enqueued to a ring buffer, which is shared among all socket faces.
The RxLoop thread calls C SocketRxConns_RxBurst function to dequeue from this ring buffer.
TX logic is implemented in go_SocketFace_TxBurst function.
The TxLoop thread may call this function to write a packet to the sockettransport.Transport.
Since this is a synchronous call, the TxLoop thread could get blocked if the socket buffer is full.
This package offers a specialized implementation when the net.Conn is identified to be a UDP socket.
Receiving and sending packets are implemented in C.
RX logic is implemented in rxEpoll type.
It maintains an epoll instance that waits for any of the socket file descriptors of all socket faces to become readable or have an error.
The RxLoop thread calls SocketRxEpoll_RxBurst function, which checks for epoll events.
Upon notified by epoll, packets are received from the socket into mbufs via recvmmsg syscall, and any socket errors are ignored.
TX logic is implemented in SocketFace_DgramTxBurst function, which transmits the packet via sendmmsg syscall.