681 строка
18 KiB
C
681 строка
18 KiB
C
/*
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* VMware vSockets Driver
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*
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* Copyright (C) 2009-2013 VMware, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation version 2 and no later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/stddef.h>
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#include <net/sock.h>
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#include "vmci_transport_notify.h"
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#define PKT_FIELD(vsk, field_name) (vmci_trans(vsk)->notify.pkt.field_name)
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static bool vmci_transport_notify_waiting_write(struct vsock_sock *vsk)
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{
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#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY)
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bool retval;
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u64 notify_limit;
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if (!PKT_FIELD(vsk, peer_waiting_write))
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return false;
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#ifdef VSOCK_OPTIMIZATION_FLOW_CONTROL
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/* When the sender blocks, we take that as a sign that the sender is
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* faster than the receiver. To reduce the transmit rate of the sender,
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* we delay the sending of the read notification by decreasing the
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* write_notify_window. The notification is delayed until the number of
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* bytes used in the queue drops below the write_notify_window.
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*/
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if (!PKT_FIELD(vsk, peer_waiting_write_detected)) {
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PKT_FIELD(vsk, peer_waiting_write_detected) = true;
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if (PKT_FIELD(vsk, write_notify_window) < PAGE_SIZE) {
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PKT_FIELD(vsk, write_notify_window) =
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PKT_FIELD(vsk, write_notify_min_window);
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} else {
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PKT_FIELD(vsk, write_notify_window) -= PAGE_SIZE;
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if (PKT_FIELD(vsk, write_notify_window) <
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PKT_FIELD(vsk, write_notify_min_window))
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PKT_FIELD(vsk, write_notify_window) =
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PKT_FIELD(vsk, write_notify_min_window);
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}
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}
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notify_limit = vmci_trans(vsk)->consume_size -
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PKT_FIELD(vsk, write_notify_window);
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#else
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notify_limit = 0;
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#endif
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/* For now we ignore the wait information and just see if the free
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* space exceeds the notify limit. Note that improving this function
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* to be more intelligent will not require a protocol change and will
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* retain compatibility between endpoints with mixed versions of this
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* function.
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*
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* The notify_limit is used to delay notifications in the case where
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* flow control is enabled. Below the test is expressed in terms of
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* free space in the queue: if free_space > ConsumeSize -
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* write_notify_window then notify An alternate way of expressing this
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* is to rewrite the expression to use the data ready in the receive
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* queue: if write_notify_window > bufferReady then notify as
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* free_space == ConsumeSize - bufferReady.
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*/
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retval = vmci_qpair_consume_free_space(vmci_trans(vsk)->qpair) >
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notify_limit;
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#ifdef VSOCK_OPTIMIZATION_FLOW_CONTROL
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if (retval) {
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/*
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* Once we notify the peer, we reset the detected flag so the
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* next wait will again cause a decrease in the window size.
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*/
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PKT_FIELD(vsk, peer_waiting_write_detected) = false;
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}
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#endif
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return retval;
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#else
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return true;
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#endif
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}
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static bool vmci_transport_notify_waiting_read(struct vsock_sock *vsk)
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{
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#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY)
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if (!PKT_FIELD(vsk, peer_waiting_read))
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return false;
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/* For now we ignore the wait information and just see if there is any
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* data for our peer to read. Note that improving this function to be
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* more intelligent will not require a protocol change and will retain
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* compatibility between endpoints with mixed versions of this
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* function.
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*/
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return vmci_qpair_produce_buf_ready(vmci_trans(vsk)->qpair) > 0;
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#else
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return true;
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#endif
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}
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static void
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vmci_transport_handle_waiting_read(struct sock *sk,
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struct vmci_transport_packet *pkt,
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bool bottom_half,
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struct sockaddr_vm *dst,
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struct sockaddr_vm *src)
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{
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#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY)
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struct vsock_sock *vsk;
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vsk = vsock_sk(sk);
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PKT_FIELD(vsk, peer_waiting_read) = true;
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memcpy(&PKT_FIELD(vsk, peer_waiting_read_info), &pkt->u.wait,
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sizeof(PKT_FIELD(vsk, peer_waiting_read_info)));
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if (vmci_transport_notify_waiting_read(vsk)) {
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bool sent;
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if (bottom_half)
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sent = vmci_transport_send_wrote_bh(dst, src) > 0;
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else
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sent = vmci_transport_send_wrote(sk) > 0;
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if (sent)
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PKT_FIELD(vsk, peer_waiting_read) = false;
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}
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#endif
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}
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static void
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vmci_transport_handle_waiting_write(struct sock *sk,
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struct vmci_transport_packet *pkt,
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bool bottom_half,
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struct sockaddr_vm *dst,
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struct sockaddr_vm *src)
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{
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#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY)
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struct vsock_sock *vsk;
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vsk = vsock_sk(sk);
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PKT_FIELD(vsk, peer_waiting_write) = true;
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memcpy(&PKT_FIELD(vsk, peer_waiting_write_info), &pkt->u.wait,
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sizeof(PKT_FIELD(vsk, peer_waiting_write_info)));
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if (vmci_transport_notify_waiting_write(vsk)) {
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bool sent;
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if (bottom_half)
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sent = vmci_transport_send_read_bh(dst, src) > 0;
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else
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sent = vmci_transport_send_read(sk) > 0;
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if (sent)
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PKT_FIELD(vsk, peer_waiting_write) = false;
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}
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#endif
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}
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static void
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vmci_transport_handle_read(struct sock *sk,
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struct vmci_transport_packet *pkt,
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bool bottom_half,
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struct sockaddr_vm *dst, struct sockaddr_vm *src)
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{
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#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY)
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struct vsock_sock *vsk;
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vsk = vsock_sk(sk);
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PKT_FIELD(vsk, sent_waiting_write) = false;
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#endif
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sk->sk_write_space(sk);
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}
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static bool send_waiting_read(struct sock *sk, u64 room_needed)
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{
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#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY)
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struct vsock_sock *vsk;
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struct vmci_transport_waiting_info waiting_info;
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u64 tail;
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u64 head;
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u64 room_left;
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bool ret;
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vsk = vsock_sk(sk);
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if (PKT_FIELD(vsk, sent_waiting_read))
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return true;
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if (PKT_FIELD(vsk, write_notify_window) <
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vmci_trans(vsk)->consume_size)
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PKT_FIELD(vsk, write_notify_window) =
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min(PKT_FIELD(vsk, write_notify_window) + PAGE_SIZE,
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vmci_trans(vsk)->consume_size);
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vmci_qpair_get_consume_indexes(vmci_trans(vsk)->qpair, &tail, &head);
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room_left = vmci_trans(vsk)->consume_size - head;
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if (room_needed >= room_left) {
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waiting_info.offset = room_needed - room_left;
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waiting_info.generation =
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PKT_FIELD(vsk, consume_q_generation) + 1;
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} else {
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waiting_info.offset = head + room_needed;
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waiting_info.generation = PKT_FIELD(vsk, consume_q_generation);
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}
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ret = vmci_transport_send_waiting_read(sk, &waiting_info) > 0;
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if (ret)
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PKT_FIELD(vsk, sent_waiting_read) = true;
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return ret;
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#else
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return true;
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#endif
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}
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static bool send_waiting_write(struct sock *sk, u64 room_needed)
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{
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#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY)
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struct vsock_sock *vsk;
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struct vmci_transport_waiting_info waiting_info;
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u64 tail;
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u64 head;
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u64 room_left;
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bool ret;
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vsk = vsock_sk(sk);
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if (PKT_FIELD(vsk, sent_waiting_write))
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return true;
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vmci_qpair_get_produce_indexes(vmci_trans(vsk)->qpair, &tail, &head);
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room_left = vmci_trans(vsk)->produce_size - tail;
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if (room_needed + 1 >= room_left) {
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/* Wraps around to current generation. */
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waiting_info.offset = room_needed + 1 - room_left;
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waiting_info.generation = PKT_FIELD(vsk, produce_q_generation);
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} else {
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waiting_info.offset = tail + room_needed + 1;
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waiting_info.generation =
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PKT_FIELD(vsk, produce_q_generation) - 1;
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}
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ret = vmci_transport_send_waiting_write(sk, &waiting_info) > 0;
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if (ret)
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PKT_FIELD(vsk, sent_waiting_write) = true;
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return ret;
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#else
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return true;
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#endif
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}
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static int vmci_transport_send_read_notification(struct sock *sk)
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{
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struct vsock_sock *vsk;
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bool sent_read;
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unsigned int retries;
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int err;
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vsk = vsock_sk(sk);
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sent_read = false;
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retries = 0;
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err = 0;
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if (vmci_transport_notify_waiting_write(vsk)) {
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/* Notify the peer that we have read, retrying the send on
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* failure up to our maximum value. XXX For now we just log
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* the failure, but later we should schedule a work item to
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* handle the resend until it succeeds. That would require
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* keeping track of work items in the vsk and cleaning them up
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* upon socket close.
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*/
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while (!(vsk->peer_shutdown & RCV_SHUTDOWN) &&
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!sent_read &&
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retries < VMCI_TRANSPORT_MAX_DGRAM_RESENDS) {
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err = vmci_transport_send_read(sk);
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if (err >= 0)
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sent_read = true;
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retries++;
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}
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if (retries >= VMCI_TRANSPORT_MAX_DGRAM_RESENDS)
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pr_err("%p unable to send read notify to peer\n", sk);
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else
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#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY)
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PKT_FIELD(vsk, peer_waiting_write) = false;
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#endif
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}
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return err;
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}
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static void
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vmci_transport_handle_wrote(struct sock *sk,
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struct vmci_transport_packet *pkt,
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bool bottom_half,
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struct sockaddr_vm *dst, struct sockaddr_vm *src)
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{
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#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY)
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struct vsock_sock *vsk = vsock_sk(sk);
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PKT_FIELD(vsk, sent_waiting_read) = false;
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#endif
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sk->sk_data_ready(sk, 0);
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}
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static void vmci_transport_notify_pkt_socket_init(struct sock *sk)
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{
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struct vsock_sock *vsk = vsock_sk(sk);
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PKT_FIELD(vsk, write_notify_window) = PAGE_SIZE;
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PKT_FIELD(vsk, write_notify_min_window) = PAGE_SIZE;
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PKT_FIELD(vsk, peer_waiting_read) = false;
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PKT_FIELD(vsk, peer_waiting_write) = false;
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PKT_FIELD(vsk, peer_waiting_write_detected) = false;
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PKT_FIELD(vsk, sent_waiting_read) = false;
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PKT_FIELD(vsk, sent_waiting_write) = false;
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PKT_FIELD(vsk, produce_q_generation) = 0;
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PKT_FIELD(vsk, consume_q_generation) = 0;
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memset(&PKT_FIELD(vsk, peer_waiting_read_info), 0,
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sizeof(PKT_FIELD(vsk, peer_waiting_read_info)));
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memset(&PKT_FIELD(vsk, peer_waiting_write_info), 0,
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sizeof(PKT_FIELD(vsk, peer_waiting_write_info)));
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}
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static void vmci_transport_notify_pkt_socket_destruct(struct vsock_sock *vsk)
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{
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}
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static int
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vmci_transport_notify_pkt_poll_in(struct sock *sk,
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size_t target, bool *data_ready_now)
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{
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struct vsock_sock *vsk = vsock_sk(sk);
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if (vsock_stream_has_data(vsk)) {
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*data_ready_now = true;
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} else {
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/* We can't read right now because there is nothing in the
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* queue. Ask for notifications when there is something to
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* read.
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*/
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if (sk->sk_state == SS_CONNECTED) {
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if (!send_waiting_read(sk, 1))
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return -1;
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}
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*data_ready_now = false;
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}
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return 0;
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}
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static int
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vmci_transport_notify_pkt_poll_out(struct sock *sk,
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size_t target, bool *space_avail_now)
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{
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s64 produce_q_free_space;
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struct vsock_sock *vsk = vsock_sk(sk);
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produce_q_free_space = vsock_stream_has_space(vsk);
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if (produce_q_free_space > 0) {
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*space_avail_now = true;
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return 0;
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} else if (produce_q_free_space == 0) {
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/* This is a connected socket but we can't currently send data.
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* Notify the peer that we are waiting if the queue is full. We
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* only send a waiting write if the queue is full because
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* otherwise we end up in an infinite WAITING_WRITE, READ,
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* WAITING_WRITE, READ, etc. loop. Treat failing to send the
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* notification as a socket error, passing that back through
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* the mask.
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*/
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if (!send_waiting_write(sk, 1))
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return -1;
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*space_avail_now = false;
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}
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return 0;
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}
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static int
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vmci_transport_notify_pkt_recv_init(
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struct sock *sk,
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size_t target,
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struct vmci_transport_recv_notify_data *data)
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{
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struct vsock_sock *vsk = vsock_sk(sk);
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#ifdef VSOCK_OPTIMIZATION_WAITING_NOTIFY
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data->consume_head = 0;
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data->produce_tail = 0;
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#ifdef VSOCK_OPTIMIZATION_FLOW_CONTROL
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data->notify_on_block = false;
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if (PKT_FIELD(vsk, write_notify_min_window) < target + 1) {
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PKT_FIELD(vsk, write_notify_min_window) = target + 1;
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if (PKT_FIELD(vsk, write_notify_window) <
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PKT_FIELD(vsk, write_notify_min_window)) {
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/* If the current window is smaller than the new
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* minimal window size, we need to reevaluate whether
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* we need to notify the sender. If the number of ready
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* bytes are smaller than the new window, we need to
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* send a notification to the sender before we block.
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*/
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PKT_FIELD(vsk, write_notify_window) =
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PKT_FIELD(vsk, write_notify_min_window);
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data->notify_on_block = true;
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}
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}
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#endif
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#endif
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return 0;
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}
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static int
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vmci_transport_notify_pkt_recv_pre_block(
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struct sock *sk,
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size_t target,
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struct vmci_transport_recv_notify_data *data)
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{
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int err = 0;
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/* Notify our peer that we are waiting for data to read. */
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if (!send_waiting_read(sk, target)) {
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err = -EHOSTUNREACH;
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return err;
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}
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#ifdef VSOCK_OPTIMIZATION_FLOW_CONTROL
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if (data->notify_on_block) {
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err = vmci_transport_send_read_notification(sk);
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if (err < 0)
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return err;
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data->notify_on_block = false;
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}
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#endif
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return err;
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}
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static int
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vmci_transport_notify_pkt_recv_pre_dequeue(
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struct sock *sk,
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size_t target,
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struct vmci_transport_recv_notify_data *data)
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{
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struct vsock_sock *vsk = vsock_sk(sk);
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/* Now consume up to len bytes from the queue. Note that since we have
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* the socket locked we should copy at least ready bytes.
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*/
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#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY)
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vmci_qpair_get_consume_indexes(vmci_trans(vsk)->qpair,
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&data->produce_tail,
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&data->consume_head);
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#endif
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return 0;
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}
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static int
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vmci_transport_notify_pkt_recv_post_dequeue(
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struct sock *sk,
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size_t target,
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ssize_t copied,
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bool data_read,
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struct vmci_transport_recv_notify_data *data)
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{
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struct vsock_sock *vsk;
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int err;
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vsk = vsock_sk(sk);
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err = 0;
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if (data_read) {
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#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY)
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/* Detect a wrap-around to maintain queue generation. Note
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* that this is safe since we hold the socket lock across the
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* two queue pair operations.
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*/
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if (copied >=
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vmci_trans(vsk)->consume_size - data->consume_head)
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PKT_FIELD(vsk, consume_q_generation)++;
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#endif
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err = vmci_transport_send_read_notification(sk);
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if (err < 0)
|
|
return err;
|
|
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
vmci_transport_notify_pkt_send_init(
|
|
struct sock *sk,
|
|
struct vmci_transport_send_notify_data *data)
|
|
{
|
|
#ifdef VSOCK_OPTIMIZATION_WAITING_NOTIFY
|
|
data->consume_head = 0;
|
|
data->produce_tail = 0;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
vmci_transport_notify_pkt_send_pre_block(
|
|
struct sock *sk,
|
|
struct vmci_transport_send_notify_data *data)
|
|
{
|
|
/* Notify our peer that we are waiting for room to write. */
|
|
if (!send_waiting_write(sk, 1))
|
|
return -EHOSTUNREACH;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
vmci_transport_notify_pkt_send_pre_enqueue(
|
|
struct sock *sk,
|
|
struct vmci_transport_send_notify_data *data)
|
|
{
|
|
struct vsock_sock *vsk = vsock_sk(sk);
|
|
|
|
#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY)
|
|
vmci_qpair_get_produce_indexes(vmci_trans(vsk)->qpair,
|
|
&data->produce_tail,
|
|
&data->consume_head);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
vmci_transport_notify_pkt_send_post_enqueue(
|
|
struct sock *sk,
|
|
ssize_t written,
|
|
struct vmci_transport_send_notify_data *data)
|
|
{
|
|
int err = 0;
|
|
struct vsock_sock *vsk;
|
|
bool sent_wrote = false;
|
|
int retries = 0;
|
|
|
|
vsk = vsock_sk(sk);
|
|
|
|
#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY)
|
|
/* Detect a wrap-around to maintain queue generation. Note that this
|
|
* is safe since we hold the socket lock across the two queue pair
|
|
* operations.
|
|
*/
|
|
if (written >= vmci_trans(vsk)->produce_size - data->produce_tail)
|
|
PKT_FIELD(vsk, produce_q_generation)++;
|
|
|
|
#endif
|
|
|
|
if (vmci_transport_notify_waiting_read(vsk)) {
|
|
/* Notify the peer that we have written, retrying the send on
|
|
* failure up to our maximum value. See the XXX comment for the
|
|
* corresponding piece of code in StreamRecvmsg() for potential
|
|
* improvements.
|
|
*/
|
|
while (!(vsk->peer_shutdown & RCV_SHUTDOWN) &&
|
|
!sent_wrote &&
|
|
retries < VMCI_TRANSPORT_MAX_DGRAM_RESENDS) {
|
|
err = vmci_transport_send_wrote(sk);
|
|
if (err >= 0)
|
|
sent_wrote = true;
|
|
|
|
retries++;
|
|
}
|
|
|
|
if (retries >= VMCI_TRANSPORT_MAX_DGRAM_RESENDS) {
|
|
pr_err("%p unable to send wrote notify to peer\n", sk);
|
|
return err;
|
|
} else {
|
|
#if defined(VSOCK_OPTIMIZATION_WAITING_NOTIFY)
|
|
PKT_FIELD(vsk, peer_waiting_read) = false;
|
|
#endif
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static void
|
|
vmci_transport_notify_pkt_handle_pkt(
|
|
struct sock *sk,
|
|
struct vmci_transport_packet *pkt,
|
|
bool bottom_half,
|
|
struct sockaddr_vm *dst,
|
|
struct sockaddr_vm *src, bool *pkt_processed)
|
|
{
|
|
bool processed = false;
|
|
|
|
switch (pkt->type) {
|
|
case VMCI_TRANSPORT_PACKET_TYPE_WROTE:
|
|
vmci_transport_handle_wrote(sk, pkt, bottom_half, dst, src);
|
|
processed = true;
|
|
break;
|
|
case VMCI_TRANSPORT_PACKET_TYPE_READ:
|
|
vmci_transport_handle_read(sk, pkt, bottom_half, dst, src);
|
|
processed = true;
|
|
break;
|
|
case VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE:
|
|
vmci_transport_handle_waiting_write(sk, pkt, bottom_half,
|
|
dst, src);
|
|
processed = true;
|
|
break;
|
|
|
|
case VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ:
|
|
vmci_transport_handle_waiting_read(sk, pkt, bottom_half,
|
|
dst, src);
|
|
processed = true;
|
|
break;
|
|
}
|
|
|
|
if (pkt_processed)
|
|
*pkt_processed = processed;
|
|
}
|
|
|
|
static void vmci_transport_notify_pkt_process_request(struct sock *sk)
|
|
{
|
|
struct vsock_sock *vsk = vsock_sk(sk);
|
|
|
|
PKT_FIELD(vsk, write_notify_window) = vmci_trans(vsk)->consume_size;
|
|
if (vmci_trans(vsk)->consume_size <
|
|
PKT_FIELD(vsk, write_notify_min_window))
|
|
PKT_FIELD(vsk, write_notify_min_window) =
|
|
vmci_trans(vsk)->consume_size;
|
|
}
|
|
|
|
static void vmci_transport_notify_pkt_process_negotiate(struct sock *sk)
|
|
{
|
|
struct vsock_sock *vsk = vsock_sk(sk);
|
|
|
|
PKT_FIELD(vsk, write_notify_window) = vmci_trans(vsk)->consume_size;
|
|
if (vmci_trans(vsk)->consume_size <
|
|
PKT_FIELD(vsk, write_notify_min_window))
|
|
PKT_FIELD(vsk, write_notify_min_window) =
|
|
vmci_trans(vsk)->consume_size;
|
|
}
|
|
|
|
/* Socket control packet based operations. */
|
|
struct vmci_transport_notify_ops vmci_transport_notify_pkt_ops = {
|
|
vmci_transport_notify_pkt_socket_init,
|
|
vmci_transport_notify_pkt_socket_destruct,
|
|
vmci_transport_notify_pkt_poll_in,
|
|
vmci_transport_notify_pkt_poll_out,
|
|
vmci_transport_notify_pkt_handle_pkt,
|
|
vmci_transport_notify_pkt_recv_init,
|
|
vmci_transport_notify_pkt_recv_pre_block,
|
|
vmci_transport_notify_pkt_recv_pre_dequeue,
|
|
vmci_transport_notify_pkt_recv_post_dequeue,
|
|
vmci_transport_notify_pkt_send_init,
|
|
vmci_transport_notify_pkt_send_pre_block,
|
|
vmci_transport_notify_pkt_send_pre_enqueue,
|
|
vmci_transport_notify_pkt_send_post_enqueue,
|
|
vmci_transport_notify_pkt_process_request,
|
|
vmci_transport_notify_pkt_process_negotiate,
|
|
};
|