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+.. _kernel_quic:
+
+===========
+KERNEL QUIC
+===========
+
+Overview
+========
+
+QUIC is a secure general-purpose transport protocol that creates a stateful
+interaction between a client and a server. QUIC provides end-to-end integrity
+and confidentiality. Refer to RFC 9000 for more information on QUIC.
+
+The kernel Tx side offload covers the encryption of the application streams
+in the kernel rather than in the application. These packets are 1RTT packets
+in QUIC connection. Encryption of every other packets is still done by the
+QUIC library in user space.
+
+
+
+User Interface
+==============
+
+Creating a QUIC connection
+--------------------------
+
+QUIC connection originates and terminates in the application, using one of many
+available QUIC libraries. The code instantiates QUIC client and QUIC server in
+some form and configures them to use certain addresses and ports for the
+source and destination. The client and server negotiate the set of keys to
+protect the communication during different phases of the connection, maintain
+the connection and perform congestion control.
+
+Requesting to add QUIC Tx kernel encryption to the connection
+-------------------------------------------------------------
+
+Each flow that should be encrypted by the kernel needs to be registered with
+the kernel using socket API. A setsockopt() call on the socket creates an
+association between the QUIC connection ID of the flow with the encryption
+parameters for the crypto operations:
+
+.. code_block:: c
+  struct quic_connection_info conn_info;
+  char conn_id[5] = {0x01, 0x02, 0x03, 0x04, 0x05};
+  const size_t conn_id_len = sizeof(conn_id);
+  char conn_key[16] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+                       0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f};
+  char conn_iv[12] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+                      0x08, 0x09, 0x0a, 0x0b};
+  char conn_hdr_key[16] = {0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+                       0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f};
+
+  conn_info.cipher_type = TLS_CIPHER_AES_GCM_128;
+
+  memset(&conn_info.key, 0, sizeof(struct quic_connection_info_key));
+  conn_info.key.conn_id_length = 5;
+  memcpy(&conn_info.key.conn_id[QUIC_MAX_CONNECTION_ID_SIZE - conn_id_len],
+         &conn_id, conn_id_len);
+
+  memcpy(&conn_info.payload_key, conn_key, sizeof(conn_key));
+  memcpy(&conn_info.payload_iv, conn_iv, sizeof(conn_iv));
+  memcpy(&conn_info.header_key, conn_hdr_key, sizeof(conn_hdr_key));
+
+  setsockopt(fd, SOL_UDP, UDP_QUIC_ADD_TX_CONNECTION, &conn_info,
+             sizeof(conn_info));
+
+
+Requesting to remove QUIC Tx kernel crypto offload control messages
+-------------------------------------------------------------------
+
+All flows are removed when the socket is closed. To request an explicit remove
+of the offload for the connection during the lifetime of the socket the process
+is similar to adding the flow. Only the connection ID and its length are 
+necessary to supply to remove the connection from the offload:
+
+.. code_block:: c
+
+  memset(&conn_info.key, 0, sizeof(struct quic_connection_info_key));
+  conn_info.key.conn_id_length = 5;
+  memcpy(&conn_info.key.conn_id[QUIC_MAX_CONNECTION_ID_SIZE - conn_id_len],
+         &conn_id, conn_id_len);
+  setsockopt(fd, SOL_UDP, UDP_QUIC_DEL_TX_CONNECTION, &conn_info,
+             sizeof(conn_info));
+
+Sending QUIC application data
+-----------------------------
+
+For QUIC Tx encryption offload, the application should use sendmsg() socket
+call and provide ancillary data with information on connection ID length and
+offload flags for the kernel to perform the encryption and GSO support if
+requested.
+
+.. code_block:: c
+
+  size_t cmsg_tx_len = sizeof(struct quic_tx_ancillary_data);
+  uint8_t cmsg_buf[CMSG_SPACE(cmsg_tx_len)];
+  struct quic_tx_ancillary_data * anc_data;
+  size_t quic_data_len = 4500;
+  struct cmsghdr * cmsg_hdr;
+  char quic_data[9000];
+  struct iovec iov[2];
+  int send_len = 9000;
+  struct msghdr msg;
+  int err;
+
+  iov[0].iov_base = quic_data;
+  iov[0].iov_len = quic_data_len;
+  iov[1].iov_base = quic_data + 4500;
+  iov[1].iov_len = quic_data_len;
+
+  if (client.addr.sin_family == AF_INET) {
+    msg.msg_name = &client.addr;
+    msg.msg_namelen = sizeof(client.addr);
+  } else {
+    msg.msg_name = &client.addr6;
+    msg.msg_namelen = sizeof(client.addr6);
+  }
+
+  msg.msg_iov = iov;
+  msg.msg_iovlen = 2;
+  msg.msg_control = cmsg_buf;
+  msg.msg_controllen = sizeof(cmsg_buf);
+  cmsg_hdr = CMSG_FIRSTHDR(&msg);
+  cmsg_hdr->cmsg_level = IPPROTO_UDP;
+  cmsg_hdr->cmsg_type = UDP_QUIC_ENCRYPT;
+  cmsg_hdr->cmsg_len = CMSG_LEN(cmsg_tx_len);
+  anc_data = CMSG_DATA(cmsg_hdr);
+  anc_data->flags = 0;
+  anc_data->next_pkt_num = 0x0d65c9;
+  anc_data->conn_id_length = conn_id_len;
+  err = sendmsg(self->sfd, &msg, 0);
+
+QUIC Tx offload in kernel will read the data from userspace, encrypt and
+copy it to the ciphertext within the same operation.
+
+
+Sending QUIC application data with GSO
+--------------------------------------
+When GSO is in use, the kernel will use the GSO fragment size as the target
+for ciphertext. The packets from the user space should align on the boundary
+of GSO fragment size minus the size of the tag for the chosen cipher. For the
+GSO fragment 1200, the plain packets should follow each other at every 1184
+bytes, given the tag size of 16. After the encryption, the rest of the UDP
+and IP stacks will follow the defined value of GSO fragment which will include
+the trailing tag bytes.
+
+To set up GSO fragmentation:
+
+.. code_block:: c
+  setsockopt(self->sfd, SOL_UDP, UDP_SEGMENT, &frag_size, sizeof(frag_size));
+
+If the GSO fragment size is provided in ancillary data within the sendmsg()
+call, the value in ancillary data will take precedence over the segment size
+provided in setsockopt to split the payload into packets. This is consistent
+with the UDP stack behavior.
+
+Integrating to userspace QUIC libraries
+---------------------------------------
+
+Userspace QUIC libraries integration would depend on the implementation of the
+QUIC protocol. For MVFST library, the control plane is integrated into the
+handshake callbacks to properly configure the flows into the socket; and the
+data plane is integrated into the methods that perform encryption and send
+the packets to the batch scheduler for transmissions to the socket.
+
+MVFST library can be found at https://github.com/facebookincubator/mvfst.
+
+Statistics
+==========
+
+QUIC Tx offload to the kernel has counters reflected in /proc/net/quic_stat:
+
+  QuicCurrTxSw  - number of currently active kernel offloaded QUIC connections
+  QuicTxSw      - accumulative total number of offloaded QUIC connections
+  QuicTxSwError - accumulative total number of errors during QUIC Tx offload to
+                  kernel
