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Merge branch 'tipc-refactor-socket-receive-functions'
Jon Maloy says: ==================== tipc: refactor socket receive functions We try to make the functions tipc_sk_recvmsg() and tipc_sk_recvstream() more readable. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
commit
5d15af6778
@ -51,6 +51,7 @@
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#define TIPC_FWD_MSG 1
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#define TIPC_MAX_PORT 0xffffffff
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#define TIPC_MIN_PORT 1
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#define TIPC_ACK_RATE 4 /* ACK at 1/4 of of rcv window size */
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enum {
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TIPC_LISTEN = TCP_LISTEN,
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@ -1290,7 +1291,7 @@ static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
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/**
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* tipc_recvmsg - receive packet-oriented message
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* @m: descriptor for message info
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* @buf_len: total size of user buffer area
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* @buflen: length of user buffer area
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* @flags: receive flags
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*
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* Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
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@ -1298,95 +1299,85 @@ static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
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*
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* Returns size of returned message data, errno otherwise
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*/
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static int tipc_recvmsg(struct socket *sock, struct msghdr *m, size_t buf_len,
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int flags)
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static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
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size_t buflen, int flags)
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{
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struct sock *sk = sock->sk;
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struct tipc_sock *tsk = tipc_sk(sk);
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struct sk_buff *buf;
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struct tipc_msg *msg;
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bool is_connectionless = tipc_sk_type_connectionless(sk);
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long timeo;
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unsigned int sz;
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u32 err;
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int res, hlen;
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struct sk_buff *skb;
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struct tipc_msg *hdr;
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bool connected = !tipc_sk_type_connectionless(sk);
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int rc, err, hlen, dlen, copy;
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long timeout;
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/* Catch invalid receive requests */
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if (unlikely(!buf_len))
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if (unlikely(!buflen))
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return -EINVAL;
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lock_sock(sk);
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if (!is_connectionless && unlikely(sk->sk_state == TIPC_OPEN)) {
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res = -ENOTCONN;
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if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
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rc = -ENOTCONN;
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goto exit;
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}
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timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
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timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
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restart:
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/* Look for a message in receive queue; wait if necessary */
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res = tipc_wait_for_rcvmsg(sock, &timeo);
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if (res)
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goto exit;
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/* Look at first message in receive queue */
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buf = skb_peek(&sk->sk_receive_queue);
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msg = buf_msg(buf);
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sz = msg_data_sz(msg);
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hlen = msg_hdr_sz(msg);
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err = msg_errcode(msg);
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/* Discard an empty non-errored message & try again */
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if ((!sz) && (!err)) {
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tsk_advance_rx_queue(sk);
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goto restart;
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}
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/* Capture sender's address (optional) */
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set_orig_addr(m, msg);
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/* Capture ancillary data (optional) */
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res = tipc_sk_anc_data_recv(m, msg, tsk);
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if (res)
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goto exit;
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/* Capture message data (if valid) & compute return value (always) */
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if (!err) {
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if (unlikely(buf_len < sz)) {
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sz = buf_len;
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m->msg_flags |= MSG_TRUNC;
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}
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res = skb_copy_datagram_msg(buf, hlen, m, sz);
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if (res)
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do {
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/* Look at first msg in receive queue; wait if necessary */
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rc = tipc_wait_for_rcvmsg(sock, &timeout);
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if (unlikely(rc))
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goto exit;
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res = sz;
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} else {
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if (is_connectionless || err == TIPC_CONN_SHUTDOWN ||
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m->msg_control)
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res = 0;
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else
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res = -ECONNRESET;
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}
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skb = skb_peek(&sk->sk_receive_queue);
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hdr = buf_msg(skb);
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dlen = msg_data_sz(hdr);
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hlen = msg_hdr_sz(hdr);
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err = msg_errcode(hdr);
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if (likely(dlen || err))
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break;
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tsk_advance_rx_queue(sk);
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} while (1);
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/* Collect msg meta data, including error code and rejected data */
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set_orig_addr(m, hdr);
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rc = tipc_sk_anc_data_recv(m, hdr, tsk);
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if (unlikely(rc))
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goto exit;
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/* Capture data if non-error msg, otherwise just set return value */
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if (likely(!err)) {
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copy = min_t(int, dlen, buflen);
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if (unlikely(copy != dlen))
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m->msg_flags |= MSG_TRUNC;
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rc = skb_copy_datagram_msg(skb, hlen, m, copy);
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} else {
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copy = 0;
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rc = 0;
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if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control)
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rc = -ECONNRESET;
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}
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if (unlikely(rc))
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goto exit;
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/* Caption of data or error code/rejected data was successful */
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if (unlikely(flags & MSG_PEEK))
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goto exit;
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if (likely(!is_connectionless)) {
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tsk->rcv_unacked += tsk_inc(tsk, hlen + sz);
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if (unlikely(tsk->rcv_unacked >= (tsk->rcv_win / 4)))
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tipc_sk_send_ack(tsk);
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}
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tsk_advance_rx_queue(sk);
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if (likely(!connected))
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goto exit;
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/* Send connection flow control ack when applicable */
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tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
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if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
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tipc_sk_send_ack(tsk);
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exit:
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release_sock(sk);
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return res;
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return rc ? rc : copy;
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}
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/**
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* tipc_recv_stream - receive stream-oriented data
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* tipc_recvstream - receive stream-oriented data
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* @m: descriptor for message info
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* @buf_len: total size of user buffer area
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* @buflen: total size of user buffer area
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* @flags: receive flags
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*
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* Used for SOCK_STREAM messages only. If not enough data is available
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@ -1394,111 +1385,98 @@ exit:
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*
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* Returns size of returned message data, errno otherwise
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*/
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static int tipc_recv_stream(struct socket *sock, struct msghdr *m,
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size_t buf_len, int flags)
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static int tipc_recvstream(struct socket *sock, struct msghdr *m,
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size_t buflen, int flags)
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{
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struct sock *sk = sock->sk;
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struct tipc_sock *tsk = tipc_sk(sk);
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struct sk_buff *buf;
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struct tipc_msg *msg;
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long timeo;
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unsigned int sz;
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int target;
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int sz_copied = 0;
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u32 err;
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int res = 0, hlen;
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struct sk_buff *skb;
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struct tipc_msg *hdr;
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struct tipc_skb_cb *skb_cb;
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bool peek = flags & MSG_PEEK;
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int offset, required, copy, copied = 0;
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int hlen, dlen, err, rc;
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long timeout;
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/* Catch invalid receive attempts */
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if (unlikely(!buf_len))
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if (unlikely(!buflen))
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return -EINVAL;
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lock_sock(sk);
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if (unlikely(sk->sk_state == TIPC_OPEN)) {
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res = -ENOTCONN;
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rc = -ENOTCONN;
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goto exit;
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}
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required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
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timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
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target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
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timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
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do {
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/* Look at first msg in receive queue; wait if necessary */
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rc = tipc_wait_for_rcvmsg(sock, &timeout);
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if (unlikely(rc))
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break;
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skb = skb_peek(&sk->sk_receive_queue);
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skb_cb = TIPC_SKB_CB(skb);
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hdr = buf_msg(skb);
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dlen = msg_data_sz(hdr);
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hlen = msg_hdr_sz(hdr);
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err = msg_errcode(hdr);
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restart:
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/* Look for a message in receive queue; wait if necessary */
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res = tipc_wait_for_rcvmsg(sock, &timeo);
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if (res)
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goto exit;
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/* Look at first message in receive queue */
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buf = skb_peek(&sk->sk_receive_queue);
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msg = buf_msg(buf);
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sz = msg_data_sz(msg);
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hlen = msg_hdr_sz(msg);
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err = msg_errcode(msg);
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/* Discard an empty non-errored message & try again */
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if ((!sz) && (!err)) {
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tsk_advance_rx_queue(sk);
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goto restart;
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}
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/* Optionally capture sender's address & ancillary data of first msg */
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if (sz_copied == 0) {
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set_orig_addr(m, msg);
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res = tipc_sk_anc_data_recv(m, msg, tsk);
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if (res)
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goto exit;
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}
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/* Capture message data (if valid) & compute return value (always) */
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if (!err) {
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u32 offset = TIPC_SKB_CB(buf)->bytes_read;
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u32 needed;
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int sz_to_copy;
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sz -= offset;
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needed = (buf_len - sz_copied);
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sz_to_copy = min(sz, needed);
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res = skb_copy_datagram_msg(buf, hlen + offset, m, sz_to_copy);
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if (res)
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goto exit;
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sz_copied += sz_to_copy;
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if (sz_to_copy < sz) {
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if (!(flags & MSG_PEEK))
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TIPC_SKB_CB(buf)->bytes_read =
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offset + sz_to_copy;
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goto exit;
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/* Discard any empty non-errored (SYN-) message */
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if (unlikely(!dlen && !err)) {
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tsk_advance_rx_queue(sk);
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continue;
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}
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} else {
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if (sz_copied != 0)
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goto exit; /* can't add error msg to valid data */
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if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
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res = 0;
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else
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res = -ECONNRESET;
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}
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/* Collect msg meta data, incl. error code and rejected data */
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if (!copied) {
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set_orig_addr(m, hdr);
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rc = tipc_sk_anc_data_recv(m, hdr, tsk);
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if (rc)
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break;
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}
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if (unlikely(flags & MSG_PEEK))
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goto exit;
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/* Copy data if msg ok, otherwise return error/partial data */
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if (likely(!err)) {
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offset = skb_cb->bytes_read;
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copy = min_t(int, dlen - offset, buflen - copied);
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rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
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if (unlikely(rc))
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break;
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copied += copy;
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offset += copy;
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if (unlikely(offset < dlen)) {
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if (!peek)
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skb_cb->bytes_read = offset;
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break;
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}
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} else {
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rc = 0;
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if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
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rc = -ECONNRESET;
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if (copied || rc)
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break;
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}
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tsk->rcv_unacked += tsk_inc(tsk, hlen + msg_data_sz(msg));
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if (unlikely(tsk->rcv_unacked >= (tsk->rcv_win / 4)))
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tipc_sk_send_ack(tsk);
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tsk_advance_rx_queue(sk);
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if (unlikely(peek))
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break;
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/* Loop around if more data is required */
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if ((sz_copied < buf_len) && /* didn't get all requested data */
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(!skb_queue_empty(&sk->sk_receive_queue) ||
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(sz_copied < target)) && /* and more is ready or required */
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(!err)) /* and haven't reached a FIN */
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goto restart;
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tsk_advance_rx_queue(sk);
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/* Send connection flow control advertisement when applicable */
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tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
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if (unlikely(tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE))
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tipc_sk_send_ack(tsk);
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/* Exit if all requested data or FIN/error received */
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if (copied == buflen || err)
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break;
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} while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
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exit:
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release_sock(sk);
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return sz_copied ? sz_copied : res;
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return copied ? copied : rc;
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}
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/**
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@ -2593,7 +2571,7 @@ static const struct proto_ops stream_ops = {
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.setsockopt = tipc_setsockopt,
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.getsockopt = tipc_getsockopt,
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.sendmsg = tipc_sendstream,
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.recvmsg = tipc_recv_stream,
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.recvmsg = tipc_recvstream,
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.mmap = sock_no_mmap,
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.sendpage = sock_no_sendpage
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};
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