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b9f2b0ffde
virtio_transport and vmci_transport handle the buffer_size sockopts in a very similar way. In order to support multiple transports, this patch moves this handling in the core to allow the user to change the options also if the socket is not yet assigned to any transport. This patch also adds the '.notify_buffer_size' callback in the 'struct virtio_transport' in order to inform the transport, when the buffer_size is changed by the user. It is also useful to limit the 'buffer_size' requested (e.g. virtio transports). Acked-by: Dexuan Cui <decui@microsoft.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Jorgen Hansen <jhansen@vmware.com> Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
133 lines
3.7 KiB
C
133 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* VMware vSockets Driver
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*
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* Copyright (C) 2013 VMware, Inc. All rights reserved.
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*/
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#ifndef _VMCI_TRANSPORT_H_
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#define _VMCI_TRANSPORT_H_
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#include <linux/vmw_vmci_defs.h>
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#include <linux/vmw_vmci_api.h>
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#include <net/vsock_addr.h>
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#include <net/af_vsock.h>
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/* If the packet format changes in a release then this should change too. */
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#define VMCI_TRANSPORT_PACKET_VERSION 1
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/* The resource ID on which control packets are sent. */
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#define VMCI_TRANSPORT_PACKET_RID 1
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/* The resource ID on which control packets are sent to the hypervisor. */
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#define VMCI_TRANSPORT_HYPERVISOR_PACKET_RID 15
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#define VSOCK_PROTO_INVALID 0
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#define VSOCK_PROTO_PKT_ON_NOTIFY (1 << 0)
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#define VSOCK_PROTO_ALL_SUPPORTED (VSOCK_PROTO_PKT_ON_NOTIFY)
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#define vmci_trans(_vsk) ((struct vmci_transport *)((_vsk)->trans))
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enum vmci_transport_packet_type {
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VMCI_TRANSPORT_PACKET_TYPE_INVALID = 0,
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VMCI_TRANSPORT_PACKET_TYPE_REQUEST,
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VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE,
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VMCI_TRANSPORT_PACKET_TYPE_OFFER,
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VMCI_TRANSPORT_PACKET_TYPE_ATTACH,
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VMCI_TRANSPORT_PACKET_TYPE_WROTE,
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VMCI_TRANSPORT_PACKET_TYPE_READ,
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VMCI_TRANSPORT_PACKET_TYPE_RST,
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VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN,
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VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE,
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VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ,
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VMCI_TRANSPORT_PACKET_TYPE_REQUEST2,
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VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2,
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VMCI_TRANSPORT_PACKET_TYPE_MAX
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};
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struct vmci_transport_waiting_info {
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u64 generation;
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u64 offset;
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};
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/* Control packet type for STREAM sockets. DGRAMs have no control packets nor
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* special packet header for data packets, they are just raw VMCI DGRAM
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* messages. For STREAMs, control packets are sent over the control channel
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* while data is written and read directly from queue pairs with no packet
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* format.
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*/
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struct vmci_transport_packet {
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struct vmci_datagram dg;
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u8 version;
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u8 type;
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u16 proto;
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u32 src_port;
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u32 dst_port;
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u32 _reserved2;
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union {
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u64 size;
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u64 mode;
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struct vmci_handle handle;
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struct vmci_transport_waiting_info wait;
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} u;
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};
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struct vmci_transport_notify_pkt {
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u64 write_notify_window;
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u64 write_notify_min_window;
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bool peer_waiting_read;
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bool peer_waiting_write;
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bool peer_waiting_write_detected;
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bool sent_waiting_read;
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bool sent_waiting_write;
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struct vmci_transport_waiting_info peer_waiting_read_info;
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struct vmci_transport_waiting_info peer_waiting_write_info;
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u64 produce_q_generation;
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u64 consume_q_generation;
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};
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struct vmci_transport_notify_pkt_q_state {
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u64 write_notify_window;
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u64 write_notify_min_window;
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bool peer_waiting_write;
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bool peer_waiting_write_detected;
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};
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union vmci_transport_notify {
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struct vmci_transport_notify_pkt pkt;
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struct vmci_transport_notify_pkt_q_state pkt_q_state;
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};
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/* Our transport-specific data. */
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struct vmci_transport {
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/* For DGRAMs. */
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struct vmci_handle dg_handle;
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/* For STREAMs. */
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struct vmci_handle qp_handle;
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struct vmci_qp *qpair;
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u64 produce_size;
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u64 consume_size;
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u32 detach_sub_id;
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union vmci_transport_notify notify;
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const struct vmci_transport_notify_ops *notify_ops;
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struct list_head elem;
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struct sock *sk;
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spinlock_t lock; /* protects sk. */
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};
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int vmci_transport_register(void);
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void vmci_transport_unregister(void);
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int vmci_transport_send_wrote_bh(struct sockaddr_vm *dst,
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struct sockaddr_vm *src);
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int vmci_transport_send_read_bh(struct sockaddr_vm *dst,
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struct sockaddr_vm *src);
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int vmci_transport_send_wrote(struct sock *sk);
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int vmci_transport_send_read(struct sock *sk);
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int vmci_transport_send_waiting_write(struct sock *sk,
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struct vmci_transport_waiting_info *wait);
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int vmci_transport_send_waiting_read(struct sock *sk,
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struct vmci_transport_waiting_info *wait);
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#endif
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