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1367 lines
35 KiB
1367 lines
35 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Networking over Thunderbolt cable using Apple ThunderboltIP protocol |
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* |
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* Copyright (C) 2017, Intel Corporation |
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* Authors: Amir Levy <[email protected]> |
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* Michael Jamet <[email protected]> |
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* Mika Westerberg <[email protected]> |
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*/ |
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|
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#include <linux/atomic.h> |
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#include <linux/highmem.h> |
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#include <linux/if_vlan.h> |
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#include <linux/jhash.h> |
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#include <linux/module.h> |
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#include <linux/etherdevice.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/sizes.h> |
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#include <linux/thunderbolt.h> |
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#include <linux/uuid.h> |
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#include <linux/workqueue.h> |
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|
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#include <net/ip6_checksum.h> |
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|
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/* Protocol timeouts in ms */ |
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#define TBNET_LOGIN_DELAY 4500 |
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#define TBNET_LOGIN_TIMEOUT 500 |
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#define TBNET_LOGOUT_TIMEOUT 100 |
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|
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#define TBNET_RING_SIZE 256 |
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#define TBNET_LOCAL_PATH 0xf |
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#define TBNET_LOGIN_RETRIES 60 |
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#define TBNET_LOGOUT_RETRIES 5 |
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#define TBNET_MATCH_FRAGS_ID BIT(1) |
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#define TBNET_MAX_MTU SZ_64K |
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#define TBNET_FRAME_SIZE SZ_4K |
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#define TBNET_MAX_PAYLOAD_SIZE \ |
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(TBNET_FRAME_SIZE - sizeof(struct thunderbolt_ip_frame_header)) |
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/* Rx packets need to hold space for skb_shared_info */ |
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#define TBNET_RX_MAX_SIZE \ |
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(TBNET_FRAME_SIZE + SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) |
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#define TBNET_RX_PAGE_ORDER get_order(TBNET_RX_MAX_SIZE) |
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#define TBNET_RX_PAGE_SIZE (PAGE_SIZE << TBNET_RX_PAGE_ORDER) |
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|
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#define TBNET_L0_PORT_NUM(route) ((route) & GENMASK(5, 0)) |
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|
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/** |
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* struct thunderbolt_ip_frame_header - Header for each Thunderbolt frame |
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* @frame_size: size of the data with the frame |
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* @frame_index: running index on the frames |
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* @frame_id: ID of the frame to match frames to specific packet |
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* @frame_count: how many frames assembles a full packet |
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* |
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* Each data frame passed to the high-speed DMA ring has this header. If |
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* the XDomain network directory announces that %TBNET_MATCH_FRAGS_ID is |
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* supported then @frame_id is filled, otherwise it stays %0. |
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*/ |
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struct thunderbolt_ip_frame_header { |
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u32 frame_size; |
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u16 frame_index; |
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u16 frame_id; |
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u32 frame_count; |
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}; |
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|
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enum thunderbolt_ip_frame_pdf { |
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TBIP_PDF_FRAME_START = 1, |
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TBIP_PDF_FRAME_END, |
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}; |
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|
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enum thunderbolt_ip_type { |
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TBIP_LOGIN, |
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TBIP_LOGIN_RESPONSE, |
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TBIP_LOGOUT, |
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TBIP_STATUS, |
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}; |
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|
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struct thunderbolt_ip_header { |
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u32 route_hi; |
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u32 route_lo; |
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u32 length_sn; |
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uuid_t uuid; |
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uuid_t initiator_uuid; |
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uuid_t target_uuid; |
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u32 type; |
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u32 command_id; |
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}; |
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|
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#define TBIP_HDR_LENGTH_MASK GENMASK(5, 0) |
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#define TBIP_HDR_SN_MASK GENMASK(28, 27) |
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#define TBIP_HDR_SN_SHIFT 27 |
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|
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struct thunderbolt_ip_login { |
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struct thunderbolt_ip_header hdr; |
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u32 proto_version; |
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u32 transmit_path; |
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u32 reserved[4]; |
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}; |
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|
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#define TBIP_LOGIN_PROTO_VERSION 1 |
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|
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struct thunderbolt_ip_login_response { |
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struct thunderbolt_ip_header hdr; |
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u32 status; |
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u32 receiver_mac[2]; |
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u32 receiver_mac_len; |
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u32 reserved[4]; |
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}; |
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|
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struct thunderbolt_ip_logout { |
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struct thunderbolt_ip_header hdr; |
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}; |
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|
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struct thunderbolt_ip_status { |
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struct thunderbolt_ip_header hdr; |
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u32 status; |
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}; |
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|
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struct tbnet_stats { |
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u64 tx_packets; |
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u64 rx_packets; |
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u64 tx_bytes; |
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u64 rx_bytes; |
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u64 rx_errors; |
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u64 tx_errors; |
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u64 rx_length_errors; |
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u64 rx_over_errors; |
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u64 rx_crc_errors; |
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u64 rx_missed_errors; |
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}; |
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|
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struct tbnet_frame { |
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struct net_device *dev; |
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struct page *page; |
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struct ring_frame frame; |
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}; |
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|
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struct tbnet_ring { |
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struct tbnet_frame frames[TBNET_RING_SIZE]; |
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unsigned int cons; |
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unsigned int prod; |
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struct tb_ring *ring; |
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}; |
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|
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/** |
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* struct tbnet - ThunderboltIP network driver private data |
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* @svc: XDomain service the driver is bound to |
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* @xd: XDomain the service blongs to |
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* @handler: ThunderboltIP configuration protocol handler |
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* @dev: Networking device |
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* @napi: NAPI structure for Rx polling |
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* @stats: Network statistics |
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* @skb: Network packet that is currently processed on Rx path |
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* @command_id: ID used for next configuration protocol packet |
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* @login_sent: ThunderboltIP login message successfully sent |
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* @login_received: ThunderboltIP login message received from the remote |
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* host |
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* @transmit_path: HopID the other end needs to use building the |
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* opposite side path. |
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* @connection_lock: Lock serializing access to @login_sent, |
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* @login_received and @transmit_path. |
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* @login_retries: Number of login retries currently done |
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* @login_work: Worker to send ThunderboltIP login packets |
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* @connected_work: Worker that finalizes the ThunderboltIP connection |
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* setup and enables DMA paths for high speed data |
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* transfers |
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* @disconnect_work: Worker that handles tearing down the ThunderboltIP |
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* connection |
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* @rx_hdr: Copy of the currently processed Rx frame. Used when a |
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* network packet consists of multiple Thunderbolt frames. |
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* In host byte order. |
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* @rx_ring: Software ring holding Rx frames |
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* @frame_id: Frame ID use for next Tx packet |
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* (if %TBNET_MATCH_FRAGS_ID is supported in both ends) |
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* @tx_ring: Software ring holding Tx frames |
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*/ |
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struct tbnet { |
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const struct tb_service *svc; |
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struct tb_xdomain *xd; |
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struct tb_protocol_handler handler; |
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struct net_device *dev; |
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struct napi_struct napi; |
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struct tbnet_stats stats; |
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struct sk_buff *skb; |
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atomic_t command_id; |
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bool login_sent; |
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bool login_received; |
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u32 transmit_path; |
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struct mutex connection_lock; |
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int login_retries; |
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struct delayed_work login_work; |
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struct work_struct connected_work; |
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struct work_struct disconnect_work; |
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struct thunderbolt_ip_frame_header rx_hdr; |
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struct tbnet_ring rx_ring; |
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atomic_t frame_id; |
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struct tbnet_ring tx_ring; |
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}; |
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|
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/* Network property directory UUID: c66189ca-1cce-4195-bdb8-49592e5f5a4f */ |
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static const uuid_t tbnet_dir_uuid = |
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UUID_INIT(0xc66189ca, 0x1cce, 0x4195, |
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0xbd, 0xb8, 0x49, 0x59, 0x2e, 0x5f, 0x5a, 0x4f); |
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|
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/* ThunderboltIP protocol UUID: 798f589e-3616-8a47-97c6-5664a920c8dd */ |
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static const uuid_t tbnet_svc_uuid = |
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UUID_INIT(0x798f589e, 0x3616, 0x8a47, |
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0x97, 0xc6, 0x56, 0x64, 0xa9, 0x20, 0xc8, 0xdd); |
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|
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static struct tb_property_dir *tbnet_dir; |
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|
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static void tbnet_fill_header(struct thunderbolt_ip_header *hdr, u64 route, |
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u8 sequence, const uuid_t *initiator_uuid, const uuid_t *target_uuid, |
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enum thunderbolt_ip_type type, size_t size, u32 command_id) |
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{ |
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u32 length_sn; |
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|
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/* Length does not include route_hi/lo and length_sn fields */ |
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length_sn = (size - 3 * 4) / 4; |
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length_sn |= (sequence << TBIP_HDR_SN_SHIFT) & TBIP_HDR_SN_MASK; |
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|
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hdr->route_hi = upper_32_bits(route); |
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hdr->route_lo = lower_32_bits(route); |
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hdr->length_sn = length_sn; |
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uuid_copy(&hdr->uuid, &tbnet_svc_uuid); |
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uuid_copy(&hdr->initiator_uuid, initiator_uuid); |
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uuid_copy(&hdr->target_uuid, target_uuid); |
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hdr->type = type; |
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hdr->command_id = command_id; |
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} |
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|
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static int tbnet_login_response(struct tbnet *net, u64 route, u8 sequence, |
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u32 command_id) |
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{ |
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struct thunderbolt_ip_login_response reply; |
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struct tb_xdomain *xd = net->xd; |
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|
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memset(&reply, 0, sizeof(reply)); |
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tbnet_fill_header(&reply.hdr, route, sequence, xd->local_uuid, |
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xd->remote_uuid, TBIP_LOGIN_RESPONSE, sizeof(reply), |
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command_id); |
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memcpy(reply.receiver_mac, net->dev->dev_addr, ETH_ALEN); |
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reply.receiver_mac_len = ETH_ALEN; |
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|
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return tb_xdomain_response(xd, &reply, sizeof(reply), |
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TB_CFG_PKG_XDOMAIN_RESP); |
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} |
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static int tbnet_login_request(struct tbnet *net, u8 sequence) |
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{ |
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struct thunderbolt_ip_login_response reply; |
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struct thunderbolt_ip_login request; |
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struct tb_xdomain *xd = net->xd; |
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|
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memset(&request, 0, sizeof(request)); |
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tbnet_fill_header(&request.hdr, xd->route, sequence, xd->local_uuid, |
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xd->remote_uuid, TBIP_LOGIN, sizeof(request), |
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atomic_inc_return(&net->command_id)); |
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|
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request.proto_version = TBIP_LOGIN_PROTO_VERSION; |
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request.transmit_path = TBNET_LOCAL_PATH; |
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|
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return tb_xdomain_request(xd, &request, sizeof(request), |
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TB_CFG_PKG_XDOMAIN_RESP, &reply, |
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sizeof(reply), TB_CFG_PKG_XDOMAIN_RESP, |
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TBNET_LOGIN_TIMEOUT); |
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} |
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|
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static int tbnet_logout_response(struct tbnet *net, u64 route, u8 sequence, |
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u32 command_id) |
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{ |
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struct thunderbolt_ip_status reply; |
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struct tb_xdomain *xd = net->xd; |
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|
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memset(&reply, 0, sizeof(reply)); |
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tbnet_fill_header(&reply.hdr, route, sequence, xd->local_uuid, |
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xd->remote_uuid, TBIP_STATUS, sizeof(reply), |
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atomic_inc_return(&net->command_id)); |
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return tb_xdomain_response(xd, &reply, sizeof(reply), |
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TB_CFG_PKG_XDOMAIN_RESP); |
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} |
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static int tbnet_logout_request(struct tbnet *net) |
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{ |
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struct thunderbolt_ip_logout request; |
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struct thunderbolt_ip_status reply; |
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struct tb_xdomain *xd = net->xd; |
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|
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memset(&request, 0, sizeof(request)); |
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tbnet_fill_header(&request.hdr, xd->route, 0, xd->local_uuid, |
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xd->remote_uuid, TBIP_LOGOUT, sizeof(request), |
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atomic_inc_return(&net->command_id)); |
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return tb_xdomain_request(xd, &request, sizeof(request), |
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TB_CFG_PKG_XDOMAIN_RESP, &reply, |
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sizeof(reply), TB_CFG_PKG_XDOMAIN_RESP, |
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TBNET_LOGOUT_TIMEOUT); |
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} |
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static void start_login(struct tbnet *net) |
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{ |
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mutex_lock(&net->connection_lock); |
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net->login_sent = false; |
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net->login_received = false; |
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mutex_unlock(&net->connection_lock); |
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|
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queue_delayed_work(system_long_wq, &net->login_work, |
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msecs_to_jiffies(1000)); |
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} |
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static void stop_login(struct tbnet *net) |
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{ |
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cancel_delayed_work_sync(&net->login_work); |
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cancel_work_sync(&net->connected_work); |
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} |
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static inline unsigned int tbnet_frame_size(const struct tbnet_frame *tf) |
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{ |
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return tf->frame.size ? : TBNET_FRAME_SIZE; |
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} |
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static void tbnet_free_buffers(struct tbnet_ring *ring) |
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{ |
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unsigned int i; |
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|
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for (i = 0; i < TBNET_RING_SIZE; i++) { |
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struct device *dma_dev = tb_ring_dma_device(ring->ring); |
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struct tbnet_frame *tf = &ring->frames[i]; |
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enum dma_data_direction dir; |
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unsigned int order; |
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size_t size; |
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|
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if (!tf->page) |
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continue; |
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|
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if (ring->ring->is_tx) { |
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dir = DMA_TO_DEVICE; |
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order = 0; |
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size = TBNET_FRAME_SIZE; |
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} else { |
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dir = DMA_FROM_DEVICE; |
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order = TBNET_RX_PAGE_ORDER; |
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size = TBNET_RX_PAGE_SIZE; |
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} |
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|
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if (tf->frame.buffer_phy) |
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dma_unmap_page(dma_dev, tf->frame.buffer_phy, size, |
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dir); |
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|
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__free_pages(tf->page, order); |
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tf->page = NULL; |
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} |
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|
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ring->cons = 0; |
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ring->prod = 0; |
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} |
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|
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static void tbnet_tear_down(struct tbnet *net, bool send_logout) |
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{ |
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netif_carrier_off(net->dev); |
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netif_stop_queue(net->dev); |
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|
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stop_login(net); |
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mutex_lock(&net->connection_lock); |
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|
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if (net->login_sent && net->login_received) { |
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int retries = TBNET_LOGOUT_RETRIES; |
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|
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while (send_logout && retries-- > 0) { |
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int ret = tbnet_logout_request(net); |
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if (ret != -ETIMEDOUT) |
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break; |
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} |
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|
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tb_ring_stop(net->rx_ring.ring); |
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tb_ring_stop(net->tx_ring.ring); |
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tbnet_free_buffers(&net->rx_ring); |
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tbnet_free_buffers(&net->tx_ring); |
|
|
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if (tb_xdomain_disable_paths(net->xd)) |
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netdev_warn(net->dev, "failed to disable DMA paths\n"); |
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} |
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|
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net->login_retries = 0; |
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net->login_sent = false; |
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net->login_received = false; |
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|
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mutex_unlock(&net->connection_lock); |
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} |
|
|
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static int tbnet_handle_packet(const void *buf, size_t size, void *data) |
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{ |
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const struct thunderbolt_ip_login *pkg = buf; |
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struct tbnet *net = data; |
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u32 command_id; |
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int ret = 0; |
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u32 sequence; |
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u64 route; |
|
|
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/* Make sure the packet is for us */ |
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if (size < sizeof(struct thunderbolt_ip_header)) |
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return 0; |
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if (!uuid_equal(&pkg->hdr.initiator_uuid, net->xd->remote_uuid)) |
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return 0; |
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if (!uuid_equal(&pkg->hdr.target_uuid, net->xd->local_uuid)) |
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return 0; |
|
|
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route = ((u64)pkg->hdr.route_hi << 32) | pkg->hdr.route_lo; |
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route &= ~BIT_ULL(63); |
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if (route != net->xd->route) |
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return 0; |
|
|
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sequence = pkg->hdr.length_sn & TBIP_HDR_SN_MASK; |
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sequence >>= TBIP_HDR_SN_SHIFT; |
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command_id = pkg->hdr.command_id; |
|
|
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switch (pkg->hdr.type) { |
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case TBIP_LOGIN: |
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if (!netif_running(net->dev)) |
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break; |
|
|
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ret = tbnet_login_response(net, route, sequence, |
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pkg->hdr.command_id); |
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if (!ret) { |
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mutex_lock(&net->connection_lock); |
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net->login_received = true; |
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net->transmit_path = pkg->transmit_path; |
|
|
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/* If we reached the number of max retries or |
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* previous logout, schedule another round of |
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* login retries |
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*/ |
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if (net->login_retries >= TBNET_LOGIN_RETRIES || |
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!net->login_sent) { |
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net->login_retries = 0; |
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queue_delayed_work(system_long_wq, |
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&net->login_work, 0); |
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} |
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mutex_unlock(&net->connection_lock); |
|
|
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queue_work(system_long_wq, &net->connected_work); |
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} |
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break; |
|
|
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case TBIP_LOGOUT: |
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ret = tbnet_logout_response(net, route, sequence, command_id); |
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if (!ret) |
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queue_work(system_long_wq, &net->disconnect_work); |
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break; |
|
|
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default: |
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return 0; |
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} |
|
|
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if (ret) |
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netdev_warn(net->dev, "failed to send ThunderboltIP response\n"); |
|
|
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return 1; |
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} |
|
|
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static unsigned int tbnet_available_buffers(const struct tbnet_ring *ring) |
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{ |
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return ring->prod - ring->cons; |
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} |
|
|
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static int tbnet_alloc_rx_buffers(struct tbnet *net, unsigned int nbuffers) |
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{ |
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struct tbnet_ring *ring = &net->rx_ring; |
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int ret; |
|
|
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while (nbuffers--) { |
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struct device *dma_dev = tb_ring_dma_device(ring->ring); |
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unsigned int index = ring->prod & (TBNET_RING_SIZE - 1); |
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struct tbnet_frame *tf = &ring->frames[index]; |
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dma_addr_t dma_addr; |
|
|
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if (tf->page) |
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break; |
|
|
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/* Allocate page (order > 0) so that it can hold maximum |
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* ThunderboltIP frame (4kB) and the additional room for |
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* SKB shared info required by build_skb(). |
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*/ |
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tf->page = dev_alloc_pages(TBNET_RX_PAGE_ORDER); |
|
if (!tf->page) { |
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ret = -ENOMEM; |
|
goto err_free; |
|
} |
|
|
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dma_addr = dma_map_page(dma_dev, tf->page, 0, |
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TBNET_RX_PAGE_SIZE, DMA_FROM_DEVICE); |
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if (dma_mapping_error(dma_dev, dma_addr)) { |
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ret = -ENOMEM; |
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goto err_free; |
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} |
|
|
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tf->frame.buffer_phy = dma_addr; |
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tf->dev = net->dev; |
|
|
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tb_ring_rx(ring->ring, &tf->frame); |
|
|
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ring->prod++; |
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} |
|
|
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return 0; |
|
|
|
err_free: |
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tbnet_free_buffers(ring); |
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return ret; |
|
} |
|
|
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static struct tbnet_frame *tbnet_get_tx_buffer(struct tbnet *net) |
|
{ |
|
struct tbnet_ring *ring = &net->tx_ring; |
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struct device *dma_dev = tb_ring_dma_device(ring->ring); |
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struct tbnet_frame *tf; |
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unsigned int index; |
|
|
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if (!tbnet_available_buffers(ring)) |
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return NULL; |
|
|
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index = ring->cons++ & (TBNET_RING_SIZE - 1); |
|
|
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tf = &ring->frames[index]; |
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tf->frame.size = 0; |
|
|
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dma_sync_single_for_cpu(dma_dev, tf->frame.buffer_phy, |
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tbnet_frame_size(tf), DMA_TO_DEVICE); |
|
|
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return tf; |
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} |
|
|
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static void tbnet_tx_callback(struct tb_ring *ring, struct ring_frame *frame, |
|
bool canceled) |
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{ |
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struct tbnet_frame *tf = container_of(frame, typeof(*tf), frame); |
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struct tbnet *net = netdev_priv(tf->dev); |
|
|
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/* Return buffer to the ring */ |
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net->tx_ring.prod++; |
|
|
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if (tbnet_available_buffers(&net->tx_ring) >= TBNET_RING_SIZE / 2) |
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netif_wake_queue(net->dev); |
|
} |
|
|
|
static int tbnet_alloc_tx_buffers(struct tbnet *net) |
|
{ |
|
struct tbnet_ring *ring = &net->tx_ring; |
|
struct device *dma_dev = tb_ring_dma_device(ring->ring); |
|
unsigned int i; |
|
|
|
for (i = 0; i < TBNET_RING_SIZE; i++) { |
|
struct tbnet_frame *tf = &ring->frames[i]; |
|
dma_addr_t dma_addr; |
|
|
|
tf->page = alloc_page(GFP_KERNEL); |
|
if (!tf->page) { |
|
tbnet_free_buffers(ring); |
|
return -ENOMEM; |
|
} |
|
|
|
dma_addr = dma_map_page(dma_dev, tf->page, 0, TBNET_FRAME_SIZE, |
|
DMA_TO_DEVICE); |
|
if (dma_mapping_error(dma_dev, dma_addr)) { |
|
__free_page(tf->page); |
|
tf->page = NULL; |
|
tbnet_free_buffers(ring); |
|
return -ENOMEM; |
|
} |
|
|
|
tf->dev = net->dev; |
|
tf->frame.buffer_phy = dma_addr; |
|
tf->frame.callback = tbnet_tx_callback; |
|
tf->frame.sof = TBIP_PDF_FRAME_START; |
|
tf->frame.eof = TBIP_PDF_FRAME_END; |
|
} |
|
|
|
ring->cons = 0; |
|
ring->prod = TBNET_RING_SIZE - 1; |
|
|
|
return 0; |
|
} |
|
|
|
static void tbnet_connected_work(struct work_struct *work) |
|
{ |
|
struct tbnet *net = container_of(work, typeof(*net), connected_work); |
|
bool connected; |
|
int ret; |
|
|
|
if (netif_carrier_ok(net->dev)) |
|
return; |
|
|
|
mutex_lock(&net->connection_lock); |
|
connected = net->login_sent && net->login_received; |
|
mutex_unlock(&net->connection_lock); |
|
|
|
if (!connected) |
|
return; |
|
|
|
/* Both logins successful so enable the high-speed DMA paths and |
|
* start the network device queue. |
|
*/ |
|
ret = tb_xdomain_enable_paths(net->xd, TBNET_LOCAL_PATH, |
|
net->rx_ring.ring->hop, |
|
net->transmit_path, |
|
net->tx_ring.ring->hop); |
|
if (ret) { |
|
netdev_err(net->dev, "failed to enable DMA paths\n"); |
|
return; |
|
} |
|
|
|
tb_ring_start(net->tx_ring.ring); |
|
tb_ring_start(net->rx_ring.ring); |
|
|
|
ret = tbnet_alloc_rx_buffers(net, TBNET_RING_SIZE); |
|
if (ret) |
|
goto err_stop_rings; |
|
|
|
ret = tbnet_alloc_tx_buffers(net); |
|
if (ret) |
|
goto err_free_rx_buffers; |
|
|
|
netif_carrier_on(net->dev); |
|
netif_start_queue(net->dev); |
|
return; |
|
|
|
err_free_rx_buffers: |
|
tbnet_free_buffers(&net->rx_ring); |
|
err_stop_rings: |
|
tb_ring_stop(net->rx_ring.ring); |
|
tb_ring_stop(net->tx_ring.ring); |
|
} |
|
|
|
static void tbnet_login_work(struct work_struct *work) |
|
{ |
|
struct tbnet *net = container_of(work, typeof(*net), login_work.work); |
|
unsigned long delay = msecs_to_jiffies(TBNET_LOGIN_DELAY); |
|
int ret; |
|
|
|
if (netif_carrier_ok(net->dev)) |
|
return; |
|
|
|
ret = tbnet_login_request(net, net->login_retries % 4); |
|
if (ret) { |
|
if (net->login_retries++ < TBNET_LOGIN_RETRIES) { |
|
queue_delayed_work(system_long_wq, &net->login_work, |
|
delay); |
|
} else { |
|
netdev_info(net->dev, "ThunderboltIP login timed out\n"); |
|
} |
|
} else { |
|
net->login_retries = 0; |
|
|
|
mutex_lock(&net->connection_lock); |
|
net->login_sent = true; |
|
mutex_unlock(&net->connection_lock); |
|
|
|
queue_work(system_long_wq, &net->connected_work); |
|
} |
|
} |
|
|
|
static void tbnet_disconnect_work(struct work_struct *work) |
|
{ |
|
struct tbnet *net = container_of(work, typeof(*net), disconnect_work); |
|
|
|
tbnet_tear_down(net, false); |
|
} |
|
|
|
static bool tbnet_check_frame(struct tbnet *net, const struct tbnet_frame *tf, |
|
const struct thunderbolt_ip_frame_header *hdr) |
|
{ |
|
u32 frame_id, frame_count, frame_size, frame_index; |
|
unsigned int size; |
|
|
|
if (tf->frame.flags & RING_DESC_CRC_ERROR) { |
|
net->stats.rx_crc_errors++; |
|
return false; |
|
} else if (tf->frame.flags & RING_DESC_BUFFER_OVERRUN) { |
|
net->stats.rx_over_errors++; |
|
return false; |
|
} |
|
|
|
/* Should be greater than just header i.e. contains data */ |
|
size = tbnet_frame_size(tf); |
|
if (size <= sizeof(*hdr)) { |
|
net->stats.rx_length_errors++; |
|
return false; |
|
} |
|
|
|
frame_count = le32_to_cpu(hdr->frame_count); |
|
frame_size = le32_to_cpu(hdr->frame_size); |
|
frame_index = le16_to_cpu(hdr->frame_index); |
|
frame_id = le16_to_cpu(hdr->frame_id); |
|
|
|
if ((frame_size > size - sizeof(*hdr)) || !frame_size) { |
|
net->stats.rx_length_errors++; |
|
return false; |
|
} |
|
|
|
/* In case we're in the middle of packet, validate the frame |
|
* header based on first fragment of the packet. |
|
*/ |
|
if (net->skb && net->rx_hdr.frame_count) { |
|
/* Check the frame count fits the count field */ |
|
if (frame_count != net->rx_hdr.frame_count) { |
|
net->stats.rx_length_errors++; |
|
return false; |
|
} |
|
|
|
/* Check the frame identifiers are incremented correctly, |
|
* and id is matching. |
|
*/ |
|
if (frame_index != net->rx_hdr.frame_index + 1 || |
|
frame_id != net->rx_hdr.frame_id) { |
|
net->stats.rx_missed_errors++; |
|
return false; |
|
} |
|
|
|
if (net->skb->len + frame_size > TBNET_MAX_MTU) { |
|
net->stats.rx_length_errors++; |
|
return false; |
|
} |
|
|
|
return true; |
|
} |
|
|
|
/* Start of packet, validate the frame header */ |
|
if (frame_count == 0 || frame_count > TBNET_RING_SIZE / 4) { |
|
net->stats.rx_length_errors++; |
|
return false; |
|
} |
|
if (frame_index != 0) { |
|
net->stats.rx_missed_errors++; |
|
return false; |
|
} |
|
|
|
return true; |
|
} |
|
|
|
static int tbnet_poll(struct napi_struct *napi, int budget) |
|
{ |
|
struct tbnet *net = container_of(napi, struct tbnet, napi); |
|
unsigned int cleaned_count = tbnet_available_buffers(&net->rx_ring); |
|
struct device *dma_dev = tb_ring_dma_device(net->rx_ring.ring); |
|
unsigned int rx_packets = 0; |
|
|
|
while (rx_packets < budget) { |
|
const struct thunderbolt_ip_frame_header *hdr; |
|
unsigned int hdr_size = sizeof(*hdr); |
|
struct sk_buff *skb = NULL; |
|
struct ring_frame *frame; |
|
struct tbnet_frame *tf; |
|
struct page *page; |
|
bool last = true; |
|
u32 frame_size; |
|
|
|
/* Return some buffers to hardware, one at a time is too |
|
* slow so allocate MAX_SKB_FRAGS buffers at the same |
|
* time. |
|
*/ |
|
if (cleaned_count >= MAX_SKB_FRAGS) { |
|
tbnet_alloc_rx_buffers(net, cleaned_count); |
|
cleaned_count = 0; |
|
} |
|
|
|
frame = tb_ring_poll(net->rx_ring.ring); |
|
if (!frame) |
|
break; |
|
|
|
dma_unmap_page(dma_dev, frame->buffer_phy, |
|
TBNET_RX_PAGE_SIZE, DMA_FROM_DEVICE); |
|
|
|
tf = container_of(frame, typeof(*tf), frame); |
|
|
|
page = tf->page; |
|
tf->page = NULL; |
|
net->rx_ring.cons++; |
|
cleaned_count++; |
|
|
|
hdr = page_address(page); |
|
if (!tbnet_check_frame(net, tf, hdr)) { |
|
__free_pages(page, TBNET_RX_PAGE_ORDER); |
|
dev_kfree_skb_any(net->skb); |
|
net->skb = NULL; |
|
continue; |
|
} |
|
|
|
frame_size = le32_to_cpu(hdr->frame_size); |
|
|
|
skb = net->skb; |
|
if (!skb) { |
|
skb = build_skb(page_address(page), |
|
TBNET_RX_PAGE_SIZE); |
|
if (!skb) { |
|
__free_pages(page, TBNET_RX_PAGE_ORDER); |
|
net->stats.rx_errors++; |
|
break; |
|
} |
|
|
|
skb_reserve(skb, hdr_size); |
|
skb_put(skb, frame_size); |
|
|
|
net->skb = skb; |
|
} else { |
|
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, |
|
page, hdr_size, frame_size, |
|
TBNET_RX_PAGE_SIZE - hdr_size); |
|
} |
|
|
|
net->rx_hdr.frame_size = frame_size; |
|
net->rx_hdr.frame_count = le32_to_cpu(hdr->frame_count); |
|
net->rx_hdr.frame_index = le16_to_cpu(hdr->frame_index); |
|
net->rx_hdr.frame_id = le16_to_cpu(hdr->frame_id); |
|
last = net->rx_hdr.frame_index == net->rx_hdr.frame_count - 1; |
|
|
|
rx_packets++; |
|
net->stats.rx_bytes += frame_size; |
|
|
|
if (last) { |
|
skb->protocol = eth_type_trans(skb, net->dev); |
|
napi_gro_receive(&net->napi, skb); |
|
net->skb = NULL; |
|
} |
|
} |
|
|
|
net->stats.rx_packets += rx_packets; |
|
|
|
if (cleaned_count) |
|
tbnet_alloc_rx_buffers(net, cleaned_count); |
|
|
|
if (rx_packets >= budget) |
|
return budget; |
|
|
|
napi_complete_done(napi, rx_packets); |
|
/* Re-enable the ring interrupt */ |
|
tb_ring_poll_complete(net->rx_ring.ring); |
|
|
|
return rx_packets; |
|
} |
|
|
|
static void tbnet_start_poll(void *data) |
|
{ |
|
struct tbnet *net = data; |
|
|
|
napi_schedule(&net->napi); |
|
} |
|
|
|
static int tbnet_open(struct net_device *dev) |
|
{ |
|
struct tbnet *net = netdev_priv(dev); |
|
struct tb_xdomain *xd = net->xd; |
|
u16 sof_mask, eof_mask; |
|
struct tb_ring *ring; |
|
|
|
netif_carrier_off(dev); |
|
|
|
ring = tb_ring_alloc_tx(xd->tb->nhi, -1, TBNET_RING_SIZE, |
|
RING_FLAG_FRAME); |
|
if (!ring) { |
|
netdev_err(dev, "failed to allocate Tx ring\n"); |
|
return -ENOMEM; |
|
} |
|
net->tx_ring.ring = ring; |
|
|
|
sof_mask = BIT(TBIP_PDF_FRAME_START); |
|
eof_mask = BIT(TBIP_PDF_FRAME_END); |
|
|
|
ring = tb_ring_alloc_rx(xd->tb->nhi, -1, TBNET_RING_SIZE, |
|
RING_FLAG_FRAME, 0, sof_mask, eof_mask, |
|
tbnet_start_poll, net); |
|
if (!ring) { |
|
netdev_err(dev, "failed to allocate Rx ring\n"); |
|
tb_ring_free(net->tx_ring.ring); |
|
net->tx_ring.ring = NULL; |
|
return -ENOMEM; |
|
} |
|
net->rx_ring.ring = ring; |
|
|
|
napi_enable(&net->napi); |
|
start_login(net); |
|
|
|
return 0; |
|
} |
|
|
|
static int tbnet_stop(struct net_device *dev) |
|
{ |
|
struct tbnet *net = netdev_priv(dev); |
|
|
|
napi_disable(&net->napi); |
|
|
|
cancel_work_sync(&net->disconnect_work); |
|
tbnet_tear_down(net, true); |
|
|
|
tb_ring_free(net->rx_ring.ring); |
|
net->rx_ring.ring = NULL; |
|
tb_ring_free(net->tx_ring.ring); |
|
net->tx_ring.ring = NULL; |
|
|
|
return 0; |
|
} |
|
|
|
static bool tbnet_xmit_csum_and_map(struct tbnet *net, struct sk_buff *skb, |
|
struct tbnet_frame **frames, u32 frame_count) |
|
{ |
|
struct thunderbolt_ip_frame_header *hdr = page_address(frames[0]->page); |
|
struct device *dma_dev = tb_ring_dma_device(net->tx_ring.ring); |
|
__wsum wsum = htonl(skb->len - skb_transport_offset(skb)); |
|
unsigned int i, len, offset = skb_transport_offset(skb); |
|
__be16 protocol = skb->protocol; |
|
void *data = skb->data; |
|
void *dest = hdr + 1; |
|
__sum16 *tucso; |
|
|
|
if (skb->ip_summed != CHECKSUM_PARTIAL) { |
|
/* No need to calculate checksum so we just update the |
|
* total frame count and sync the frames for DMA. |
|
*/ |
|
for (i = 0; i < frame_count; i++) { |
|
hdr = page_address(frames[i]->page); |
|
hdr->frame_count = cpu_to_le32(frame_count); |
|
dma_sync_single_for_device(dma_dev, |
|
frames[i]->frame.buffer_phy, |
|
tbnet_frame_size(frames[i]), DMA_TO_DEVICE); |
|
} |
|
|
|
return true; |
|
} |
|
|
|
if (protocol == htons(ETH_P_8021Q)) { |
|
struct vlan_hdr *vhdr, vh; |
|
|
|
vhdr = skb_header_pointer(skb, ETH_HLEN, sizeof(vh), &vh); |
|
if (!vhdr) |
|
return false; |
|
|
|
protocol = vhdr->h_vlan_encapsulated_proto; |
|
} |
|
|
|
/* Data points on the beginning of packet. |
|
* Check is the checksum absolute place in the packet. |
|
* ipcso will update IP checksum. |
|
* tucso will update TCP/UPD checksum. |
|
*/ |
|
if (protocol == htons(ETH_P_IP)) { |
|
__sum16 *ipcso = dest + ((void *)&(ip_hdr(skb)->check) - data); |
|
|
|
*ipcso = 0; |
|
*ipcso = ip_fast_csum(dest + skb_network_offset(skb), |
|
ip_hdr(skb)->ihl); |
|
|
|
if (ip_hdr(skb)->protocol == IPPROTO_TCP) |
|
tucso = dest + ((void *)&(tcp_hdr(skb)->check) - data); |
|
else if (ip_hdr(skb)->protocol == IPPROTO_UDP) |
|
tucso = dest + ((void *)&(udp_hdr(skb)->check) - data); |
|
else |
|
return false; |
|
|
|
*tucso = ~csum_tcpudp_magic(ip_hdr(skb)->saddr, |
|
ip_hdr(skb)->daddr, 0, |
|
ip_hdr(skb)->protocol, 0); |
|
} else if (skb_is_gso_v6(skb)) { |
|
tucso = dest + ((void *)&(tcp_hdr(skb)->check) - data); |
|
*tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
|
&ipv6_hdr(skb)->daddr, 0, |
|
IPPROTO_TCP, 0); |
|
return false; |
|
} else if (protocol == htons(ETH_P_IPV6)) { |
|
tucso = dest + skb_checksum_start_offset(skb) + skb->csum_offset; |
|
*tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
|
&ipv6_hdr(skb)->daddr, 0, |
|
ipv6_hdr(skb)->nexthdr, 0); |
|
} else { |
|
return false; |
|
} |
|
|
|
/* First frame was headers, rest of the frames contain data. |
|
* Calculate checksum over each frame. |
|
*/ |
|
for (i = 0; i < frame_count; i++) { |
|
hdr = page_address(frames[i]->page); |
|
dest = (void *)(hdr + 1) + offset; |
|
len = le32_to_cpu(hdr->frame_size) - offset; |
|
wsum = csum_partial(dest, len, wsum); |
|
hdr->frame_count = cpu_to_le32(frame_count); |
|
|
|
offset = 0; |
|
} |
|
|
|
*tucso = csum_fold(wsum); |
|
|
|
/* Checksum is finally calculated and we don't touch the memory |
|
* anymore, so DMA sync the frames now. |
|
*/ |
|
for (i = 0; i < frame_count; i++) { |
|
dma_sync_single_for_device(dma_dev, frames[i]->frame.buffer_phy, |
|
tbnet_frame_size(frames[i]), DMA_TO_DEVICE); |
|
} |
|
|
|
return true; |
|
} |
|
|
|
static void *tbnet_kmap_frag(struct sk_buff *skb, unsigned int frag_num, |
|
unsigned int *len) |
|
{ |
|
const skb_frag_t *frag = &skb_shinfo(skb)->frags[frag_num]; |
|
|
|
*len = skb_frag_size(frag); |
|
return kmap_atomic(skb_frag_page(frag)) + skb_frag_off(frag); |
|
} |
|
|
|
static netdev_tx_t tbnet_start_xmit(struct sk_buff *skb, |
|
struct net_device *dev) |
|
{ |
|
struct tbnet *net = netdev_priv(dev); |
|
struct tbnet_frame *frames[MAX_SKB_FRAGS]; |
|
u16 frame_id = atomic_read(&net->frame_id); |
|
struct thunderbolt_ip_frame_header *hdr; |
|
unsigned int len = skb_headlen(skb); |
|
unsigned int data_len = skb->len; |
|
unsigned int nframes, i; |
|
unsigned int frag = 0; |
|
void *src = skb->data; |
|
u32 frame_index = 0; |
|
bool unmap = false; |
|
void *dest; |
|
|
|
nframes = DIV_ROUND_UP(data_len, TBNET_MAX_PAYLOAD_SIZE); |
|
if (tbnet_available_buffers(&net->tx_ring) < nframes) { |
|
netif_stop_queue(net->dev); |
|
return NETDEV_TX_BUSY; |
|
} |
|
|
|
frames[frame_index] = tbnet_get_tx_buffer(net); |
|
if (!frames[frame_index]) |
|
goto err_drop; |
|
|
|
hdr = page_address(frames[frame_index]->page); |
|
dest = hdr + 1; |
|
|
|
/* If overall packet is bigger than the frame data size */ |
|
while (data_len > TBNET_MAX_PAYLOAD_SIZE) { |
|
unsigned int size_left = TBNET_MAX_PAYLOAD_SIZE; |
|
|
|
hdr->frame_size = cpu_to_le32(TBNET_MAX_PAYLOAD_SIZE); |
|
hdr->frame_index = cpu_to_le16(frame_index); |
|
hdr->frame_id = cpu_to_le16(frame_id); |
|
|
|
do { |
|
if (len > size_left) { |
|
/* Copy data onto Tx buffer data with |
|
* full frame size then break and go to |
|
* next frame |
|
*/ |
|
memcpy(dest, src, size_left); |
|
len -= size_left; |
|
dest += size_left; |
|
src += size_left; |
|
break; |
|
} |
|
|
|
memcpy(dest, src, len); |
|
size_left -= len; |
|
dest += len; |
|
|
|
if (unmap) { |
|
kunmap_atomic(src); |
|
unmap = false; |
|
} |
|
|
|
/* Ensure all fragments have been processed */ |
|
if (frag < skb_shinfo(skb)->nr_frags) { |
|
/* Map and then unmap quickly */ |
|
src = tbnet_kmap_frag(skb, frag++, &len); |
|
unmap = true; |
|
} else if (unlikely(size_left > 0)) { |
|
goto err_drop; |
|
} |
|
} while (size_left > 0); |
|
|
|
data_len -= TBNET_MAX_PAYLOAD_SIZE; |
|
frame_index++; |
|
|
|
frames[frame_index] = tbnet_get_tx_buffer(net); |
|
if (!frames[frame_index]) |
|
goto err_drop; |
|
|
|
hdr = page_address(frames[frame_index]->page); |
|
dest = hdr + 1; |
|
} |
|
|
|
hdr->frame_size = cpu_to_le32(data_len); |
|
hdr->frame_index = cpu_to_le16(frame_index); |
|
hdr->frame_id = cpu_to_le16(frame_id); |
|
|
|
frames[frame_index]->frame.size = data_len + sizeof(*hdr); |
|
|
|
/* In case the remaining data_len is smaller than a frame */ |
|
while (len < data_len) { |
|
memcpy(dest, src, len); |
|
data_len -= len; |
|
dest += len; |
|
|
|
if (unmap) { |
|
kunmap_atomic(src); |
|
unmap = false; |
|
} |
|
|
|
if (frag < skb_shinfo(skb)->nr_frags) { |
|
src = tbnet_kmap_frag(skb, frag++, &len); |
|
unmap = true; |
|
} else if (unlikely(data_len > 0)) { |
|
goto err_drop; |
|
} |
|
} |
|
|
|
memcpy(dest, src, data_len); |
|
|
|
if (unmap) |
|
kunmap_atomic(src); |
|
|
|
if (!tbnet_xmit_csum_and_map(net, skb, frames, frame_index + 1)) |
|
goto err_drop; |
|
|
|
for (i = 0; i < frame_index + 1; i++) |
|
tb_ring_tx(net->tx_ring.ring, &frames[i]->frame); |
|
|
|
if (net->svc->prtcstns & TBNET_MATCH_FRAGS_ID) |
|
atomic_inc(&net->frame_id); |
|
|
|
net->stats.tx_packets++; |
|
net->stats.tx_bytes += skb->len; |
|
|
|
dev_consume_skb_any(skb); |
|
|
|
return NETDEV_TX_OK; |
|
|
|
err_drop: |
|
/* We can re-use the buffers */ |
|
net->tx_ring.cons -= frame_index; |
|
|
|
dev_kfree_skb_any(skb); |
|
net->stats.tx_errors++; |
|
|
|
return NETDEV_TX_OK; |
|
} |
|
|
|
static void tbnet_get_stats64(struct net_device *dev, |
|
struct rtnl_link_stats64 *stats) |
|
{ |
|
struct tbnet *net = netdev_priv(dev); |
|
|
|
stats->tx_packets = net->stats.tx_packets; |
|
stats->rx_packets = net->stats.rx_packets; |
|
stats->tx_bytes = net->stats.tx_bytes; |
|
stats->rx_bytes = net->stats.rx_bytes; |
|
stats->rx_errors = net->stats.rx_errors + net->stats.rx_length_errors + |
|
net->stats.rx_over_errors + net->stats.rx_crc_errors + |
|
net->stats.rx_missed_errors; |
|
stats->tx_errors = net->stats.tx_errors; |
|
stats->rx_length_errors = net->stats.rx_length_errors; |
|
stats->rx_over_errors = net->stats.rx_over_errors; |
|
stats->rx_crc_errors = net->stats.rx_crc_errors; |
|
stats->rx_missed_errors = net->stats.rx_missed_errors; |
|
} |
|
|
|
static const struct net_device_ops tbnet_netdev_ops = { |
|
.ndo_open = tbnet_open, |
|
.ndo_stop = tbnet_stop, |
|
.ndo_start_xmit = tbnet_start_xmit, |
|
.ndo_get_stats64 = tbnet_get_stats64, |
|
}; |
|
|
|
static void tbnet_generate_mac(struct net_device *dev) |
|
{ |
|
const struct tbnet *net = netdev_priv(dev); |
|
const struct tb_xdomain *xd = net->xd; |
|
u8 phy_port; |
|
u32 hash; |
|
|
|
phy_port = tb_phy_port_from_link(TBNET_L0_PORT_NUM(xd->route)); |
|
|
|
/* Unicast and locally administered MAC */ |
|
dev->dev_addr[0] = phy_port << 4 | 0x02; |
|
hash = jhash2((u32 *)xd->local_uuid, 4, 0); |
|
memcpy(dev->dev_addr + 1, &hash, sizeof(hash)); |
|
hash = jhash2((u32 *)xd->local_uuid, 4, hash); |
|
dev->dev_addr[5] = hash & 0xff; |
|
} |
|
|
|
static int tbnet_probe(struct tb_service *svc, const struct tb_service_id *id) |
|
{ |
|
struct tb_xdomain *xd = tb_service_parent(svc); |
|
struct net_device *dev; |
|
struct tbnet *net; |
|
int ret; |
|
|
|
dev = alloc_etherdev(sizeof(*net)); |
|
if (!dev) |
|
return -ENOMEM; |
|
|
|
SET_NETDEV_DEV(dev, &svc->dev); |
|
|
|
net = netdev_priv(dev); |
|
INIT_DELAYED_WORK(&net->login_work, tbnet_login_work); |
|
INIT_WORK(&net->connected_work, tbnet_connected_work); |
|
INIT_WORK(&net->disconnect_work, tbnet_disconnect_work); |
|
mutex_init(&net->connection_lock); |
|
atomic_set(&net->command_id, 0); |
|
atomic_set(&net->frame_id, 0); |
|
net->svc = svc; |
|
net->dev = dev; |
|
net->xd = xd; |
|
|
|
tbnet_generate_mac(dev); |
|
|
|
strcpy(dev->name, "thunderbolt%d"); |
|
dev->netdev_ops = &tbnet_netdev_ops; |
|
|
|
/* ThunderboltIP takes advantage of TSO packets but instead of |
|
* segmenting them we just split the packet into Thunderbolt |
|
* frames (maximum payload size of each frame is 4084 bytes) and |
|
* calculate checksum over the whole packet here. |
|
* |
|
* The receiving side does the opposite if the host OS supports |
|
* LRO, otherwise it needs to split the large packet into MTU |
|
* sized smaller packets. |
|
* |
|
* In order to receive large packets from the networking stack, |
|
* we need to announce support for most of the offloading |
|
* features here. |
|
*/ |
|
dev->hw_features = NETIF_F_SG | NETIF_F_ALL_TSO | NETIF_F_GRO | |
|
NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; |
|
dev->features = dev->hw_features | NETIF_F_HIGHDMA; |
|
dev->hard_header_len += sizeof(struct thunderbolt_ip_frame_header); |
|
|
|
netif_napi_add(dev, &net->napi, tbnet_poll, NAPI_POLL_WEIGHT); |
|
|
|
/* MTU range: 68 - 65522 */ |
|
dev->min_mtu = ETH_MIN_MTU; |
|
dev->max_mtu = TBNET_MAX_MTU - ETH_HLEN; |
|
|
|
net->handler.uuid = &tbnet_svc_uuid; |
|
net->handler.callback = tbnet_handle_packet; |
|
net->handler.data = net; |
|
tb_register_protocol_handler(&net->handler); |
|
|
|
tb_service_set_drvdata(svc, net); |
|
|
|
ret = register_netdev(dev); |
|
if (ret) { |
|
tb_unregister_protocol_handler(&net->handler); |
|
free_netdev(dev); |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void tbnet_remove(struct tb_service *svc) |
|
{ |
|
struct tbnet *net = tb_service_get_drvdata(svc); |
|
|
|
unregister_netdev(net->dev); |
|
tb_unregister_protocol_handler(&net->handler); |
|
free_netdev(net->dev); |
|
} |
|
|
|
static void tbnet_shutdown(struct tb_service *svc) |
|
{ |
|
tbnet_tear_down(tb_service_get_drvdata(svc), true); |
|
} |
|
|
|
static int __maybe_unused tbnet_suspend(struct device *dev) |
|
{ |
|
struct tb_service *svc = tb_to_service(dev); |
|
struct tbnet *net = tb_service_get_drvdata(svc); |
|
|
|
stop_login(net); |
|
if (netif_running(net->dev)) { |
|
netif_device_detach(net->dev); |
|
tbnet_tear_down(net, true); |
|
} |
|
|
|
tb_unregister_protocol_handler(&net->handler); |
|
return 0; |
|
} |
|
|
|
static int __maybe_unused tbnet_resume(struct device *dev) |
|
{ |
|
struct tb_service *svc = tb_to_service(dev); |
|
struct tbnet *net = tb_service_get_drvdata(svc); |
|
|
|
tb_register_protocol_handler(&net->handler); |
|
|
|
netif_carrier_off(net->dev); |
|
if (netif_running(net->dev)) { |
|
netif_device_attach(net->dev); |
|
start_login(net); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static const struct dev_pm_ops tbnet_pm_ops = { |
|
SET_SYSTEM_SLEEP_PM_OPS(tbnet_suspend, tbnet_resume) |
|
}; |
|
|
|
static const struct tb_service_id tbnet_ids[] = { |
|
{ TB_SERVICE("network", 1) }, |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(tbsvc, tbnet_ids); |
|
|
|
static struct tb_service_driver tbnet_driver = { |
|
.driver = { |
|
.owner = THIS_MODULE, |
|
.name = "thunderbolt-net", |
|
.pm = &tbnet_pm_ops, |
|
}, |
|
.probe = tbnet_probe, |
|
.remove = tbnet_remove, |
|
.shutdown = tbnet_shutdown, |
|
.id_table = tbnet_ids, |
|
}; |
|
|
|
static int __init tbnet_init(void) |
|
{ |
|
int ret; |
|
|
|
tbnet_dir = tb_property_create_dir(&tbnet_dir_uuid); |
|
if (!tbnet_dir) |
|
return -ENOMEM; |
|
|
|
tb_property_add_immediate(tbnet_dir, "prtcid", 1); |
|
tb_property_add_immediate(tbnet_dir, "prtcvers", 1); |
|
tb_property_add_immediate(tbnet_dir, "prtcrevs", 1); |
|
/* Currently only announce support for match frags ID (bit 1). Bit 0 |
|
* is reserved for full E2E flow control which we do not support at |
|
* the moment. |
|
*/ |
|
tb_property_add_immediate(tbnet_dir, "prtcstns", |
|
TBNET_MATCH_FRAGS_ID); |
|
|
|
ret = tb_register_property_dir("network", tbnet_dir); |
|
if (ret) { |
|
tb_property_free_dir(tbnet_dir); |
|
return ret; |
|
} |
|
|
|
return tb_register_service_driver(&tbnet_driver); |
|
} |
|
module_init(tbnet_init); |
|
|
|
static void __exit tbnet_exit(void) |
|
{ |
|
tb_unregister_service_driver(&tbnet_driver); |
|
tb_unregister_property_dir("network", tbnet_dir); |
|
tb_property_free_dir(tbnet_dir); |
|
} |
|
module_exit(tbnet_exit); |
|
|
|
MODULE_AUTHOR("Amir Levy <[email protected]>"); |
|
MODULE_AUTHOR("Michael Jamet <[email protected]>"); |
|
MODULE_AUTHOR("Mika Westerberg <[email protected]>"); |
|
MODULE_DESCRIPTION("Thunderbolt network driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|