diff options
Diffstat (limited to 'drivers/net/thunderbolt.c')
| -rw-r--r-- | drivers/net/thunderbolt.c | 1423 |
1 files changed, 0 insertions, 1423 deletions
diff --git a/drivers/net/thunderbolt.c b/drivers/net/thunderbolt.c deleted file mode 100644 index 990484776f2d..000000000000 --- a/drivers/net/thunderbolt.c +++ /dev/null @@ -1,1423 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Networking over Thunderbolt/USB4 cables using USB4NET protocol - * (formerly Apple ThunderboltIP). - * - * Copyright (C) 2017, Intel Corporation - * Authors: Amir Levy <amir.jer.levy@intel.com> - * Michael Jamet <michael.jamet@intel.com> - * Mika Westerberg <mika.westerberg@linux.intel.com> - */ - -#include <linux/atomic.h> -#include <linux/highmem.h> -#include <linux/if_vlan.h> -#include <linux/jhash.h> -#include <linux/module.h> -#include <linux/etherdevice.h> -#include <linux/rtnetlink.h> -#include <linux/sizes.h> -#include <linux/thunderbolt.h> -#include <linux/uuid.h> -#include <linux/workqueue.h> - -#include <net/ip6_checksum.h> - -/* Protocol timeouts in ms */ -#define TBNET_LOGIN_DELAY 4500 -#define TBNET_LOGIN_TIMEOUT 500 -#define TBNET_LOGOUT_TIMEOUT 1000 - -#define TBNET_RING_SIZE 256 -#define TBNET_LOGIN_RETRIES 60 -#define TBNET_LOGOUT_RETRIES 10 -#define TBNET_E2E BIT(0) -#define TBNET_MATCH_FRAGS_ID BIT(1) -#define TBNET_64K_FRAMES BIT(2) -#define TBNET_MAX_MTU SZ_64K -#define TBNET_FRAME_SIZE SZ_4K -#define TBNET_MAX_PAYLOAD_SIZE \ - (TBNET_FRAME_SIZE - sizeof(struct thunderbolt_ip_frame_header)) -/* Rx packets need to hold space for skb_shared_info */ -#define TBNET_RX_MAX_SIZE \ - (TBNET_FRAME_SIZE + SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) -#define TBNET_RX_PAGE_ORDER get_order(TBNET_RX_MAX_SIZE) -#define TBNET_RX_PAGE_SIZE (PAGE_SIZE << TBNET_RX_PAGE_ORDER) - -#define TBNET_L0_PORT_NUM(route) ((route) & GENMASK(5, 0)) - -/** - * struct thunderbolt_ip_frame_header - Header for each Thunderbolt frame - * @frame_size: size of the data with the frame - * @frame_index: running index on the frames - * @frame_id: ID of the frame to match frames to specific packet - * @frame_count: how many frames assembles a full packet - * - * Each data frame passed to the high-speed DMA ring has this header. If - * the XDomain network directory announces that %TBNET_MATCH_FRAGS_ID is - * supported then @frame_id is filled, otherwise it stays %0. - */ -struct thunderbolt_ip_frame_header { - __le32 frame_size; - __le16 frame_index; - __le16 frame_id; - __le32 frame_count; -}; - -enum thunderbolt_ip_frame_pdf { - TBIP_PDF_FRAME_START = 1, - TBIP_PDF_FRAME_END, -}; - -enum thunderbolt_ip_type { - TBIP_LOGIN, - TBIP_LOGIN_RESPONSE, - TBIP_LOGOUT, - TBIP_STATUS, -}; - -struct thunderbolt_ip_header { - u32 route_hi; - u32 route_lo; - u32 length_sn; - uuid_t uuid; - uuid_t initiator_uuid; - uuid_t target_uuid; - u32 type; - u32 command_id; -}; - -#define TBIP_HDR_LENGTH_MASK GENMASK(5, 0) -#define TBIP_HDR_SN_MASK GENMASK(28, 27) -#define TBIP_HDR_SN_SHIFT 27 - -struct thunderbolt_ip_login { - struct thunderbolt_ip_header hdr; - u32 proto_version; - u32 transmit_path; - u32 reserved[4]; -}; - -#define TBIP_LOGIN_PROTO_VERSION 1 - -struct thunderbolt_ip_login_response { - struct thunderbolt_ip_header hdr; - u32 status; - u32 receiver_mac[2]; - u32 receiver_mac_len; - u32 reserved[4]; -}; - -struct thunderbolt_ip_logout { - struct thunderbolt_ip_header hdr; -}; - -struct thunderbolt_ip_status { - struct thunderbolt_ip_header hdr; - u32 status; -}; - -struct tbnet_stats { - u64 tx_packets; - u64 rx_packets; - u64 tx_bytes; - u64 rx_bytes; - u64 rx_errors; - u64 tx_errors; - u64 rx_length_errors; - u64 rx_over_errors; - u64 rx_crc_errors; - u64 rx_missed_errors; -}; - -struct tbnet_frame { - struct net_device *dev; - struct page *page; - struct ring_frame frame; -}; - -struct tbnet_ring { - struct tbnet_frame frames[TBNET_RING_SIZE]; - unsigned int cons; - unsigned int prod; - struct tb_ring *ring; -}; - -/** - * struct tbnet - ThunderboltIP network driver private data - * @svc: XDomain service the driver is bound to - * @xd: XDomain the service blongs to - * @handler: ThunderboltIP configuration protocol handler - * @dev: Networking device - * @napi: NAPI structure for Rx polling - * @stats: Network statistics - * @skb: Network packet that is currently processed on Rx path - * @command_id: ID used for next configuration protocol packet - * @login_sent: ThunderboltIP login message successfully sent - * @login_received: ThunderboltIP login message received from the remote - * host - * @local_transmit_path: HopID we are using to send out packets - * @remote_transmit_path: HopID the other end is using to send packets to us - * @connection_lock: Lock serializing access to @login_sent, - * @login_received and @transmit_path. - * @login_retries: Number of login retries currently done - * @login_work: Worker to send ThunderboltIP login packets - * @connected_work: Worker that finalizes the ThunderboltIP connection - * setup and enables DMA paths for high speed data - * transfers - * @disconnect_work: Worker that handles tearing down the ThunderboltIP - * connection - * @rx_hdr: Copy of the currently processed Rx frame. Used when a - * network packet consists of multiple Thunderbolt frames. - * In host byte order. - * @rx_ring: Software ring holding Rx frames - * @frame_id: Frame ID use for next Tx packet - * (if %TBNET_MATCH_FRAGS_ID is supported in both ends) - * @tx_ring: Software ring holding Tx frames - */ -struct tbnet { - const struct tb_service *svc; - struct tb_xdomain *xd; - struct tb_protocol_handler handler; - struct net_device *dev; - struct napi_struct napi; - struct tbnet_stats stats; - struct sk_buff *skb; - atomic_t command_id; - bool login_sent; - bool login_received; - int local_transmit_path; - int remote_transmit_path; - struct mutex connection_lock; - int login_retries; - struct delayed_work login_work; - struct work_struct connected_work; - struct work_struct disconnect_work; - struct thunderbolt_ip_frame_header rx_hdr; - struct tbnet_ring rx_ring; - atomic_t frame_id; - struct tbnet_ring tx_ring; -}; - -/* Network property directory UUID: c66189ca-1cce-4195-bdb8-49592e5f5a4f */ -static const uuid_t tbnet_dir_uuid = - UUID_INIT(0xc66189ca, 0x1cce, 0x4195, - 0xbd, 0xb8, 0x49, 0x59, 0x2e, 0x5f, 0x5a, 0x4f); - -/* ThunderboltIP protocol UUID: 798f589e-3616-8a47-97c6-5664a920c8dd */ -static const uuid_t tbnet_svc_uuid = - UUID_INIT(0x798f589e, 0x3616, 0x8a47, - 0x97, 0xc6, 0x56, 0x64, 0xa9, 0x20, 0xc8, 0xdd); - -static struct tb_property_dir *tbnet_dir; - -static bool tbnet_e2e = true; -module_param_named(e2e, tbnet_e2e, bool, 0444); -MODULE_PARM_DESC(e2e, "USB4NET full end-to-end flow control (default: true)"); - -static void tbnet_fill_header(struct thunderbolt_ip_header *hdr, u64 route, - u8 sequence, const uuid_t *initiator_uuid, const uuid_t *target_uuid, - enum thunderbolt_ip_type type, size_t size, u32 command_id) -{ - u32 length_sn; - - /* Length does not include route_hi/lo and length_sn fields */ - length_sn = (size - 3 * 4) / 4; - length_sn |= (sequence << TBIP_HDR_SN_SHIFT) & TBIP_HDR_SN_MASK; - - hdr->route_hi = upper_32_bits(route); - hdr->route_lo = lower_32_bits(route); - hdr->length_sn = length_sn; - uuid_copy(&hdr->uuid, &tbnet_svc_uuid); - uuid_copy(&hdr->initiator_uuid, initiator_uuid); - uuid_copy(&hdr->target_uuid, target_uuid); - hdr->type = type; - hdr->command_id = command_id; -} - -static int tbnet_login_response(struct tbnet *net, u64 route, u8 sequence, - u32 command_id) -{ - struct thunderbolt_ip_login_response reply; - struct tb_xdomain *xd = net->xd; - - memset(&reply, 0, sizeof(reply)); - tbnet_fill_header(&reply.hdr, route, sequence, xd->local_uuid, - xd->remote_uuid, TBIP_LOGIN_RESPONSE, sizeof(reply), - command_id); - memcpy(reply.receiver_mac, net->dev->dev_addr, ETH_ALEN); - reply.receiver_mac_len = ETH_ALEN; - - return tb_xdomain_response(xd, &reply, sizeof(reply), - TB_CFG_PKG_XDOMAIN_RESP); -} - -static int tbnet_login_request(struct tbnet *net, u8 sequence) -{ - struct thunderbolt_ip_login_response reply; - struct thunderbolt_ip_login request; - struct tb_xdomain *xd = net->xd; - - memset(&request, 0, sizeof(request)); - tbnet_fill_header(&request.hdr, xd->route, sequence, xd->local_uuid, - xd->remote_uuid, TBIP_LOGIN, sizeof(request), - atomic_inc_return(&net->command_id)); - - request.proto_version = TBIP_LOGIN_PROTO_VERSION; - request.transmit_path = net->local_transmit_path; - - return tb_xdomain_request(xd, &request, sizeof(request), - TB_CFG_PKG_XDOMAIN_RESP, &reply, - sizeof(reply), TB_CFG_PKG_XDOMAIN_RESP, - TBNET_LOGIN_TIMEOUT); -} - -static int tbnet_logout_response(struct tbnet *net, u64 route, u8 sequence, - u32 command_id) -{ - struct thunderbolt_ip_status reply; - struct tb_xdomain *xd = net->xd; - - memset(&reply, 0, sizeof(reply)); - tbnet_fill_header(&reply.hdr, route, sequence, xd->local_uuid, - xd->remote_uuid, TBIP_STATUS, sizeof(reply), - atomic_inc_return(&net->command_id)); - return tb_xdomain_response(xd, &reply, sizeof(reply), - TB_CFG_PKG_XDOMAIN_RESP); -} - -static int tbnet_logout_request(struct tbnet *net) -{ - struct thunderbolt_ip_logout request; - struct thunderbolt_ip_status reply; - struct tb_xdomain *xd = net->xd; - - memset(&request, 0, sizeof(request)); - tbnet_fill_header(&request.hdr, xd->route, 0, xd->local_uuid, - xd->remote_uuid, TBIP_LOGOUT, sizeof(request), - atomic_inc_return(&net->command_id)); - - return tb_xdomain_request(xd, &request, sizeof(request), - TB_CFG_PKG_XDOMAIN_RESP, &reply, - sizeof(reply), TB_CFG_PKG_XDOMAIN_RESP, - TBNET_LOGOUT_TIMEOUT); -} - -static void start_login(struct tbnet *net) -{ - mutex_lock(&net->connection_lock); - net->login_sent = false; - net->login_received = false; - mutex_unlock(&net->connection_lock); - - queue_delayed_work(system_long_wq, &net->login_work, - msecs_to_jiffies(1000)); -} - -static void stop_login(struct tbnet *net) -{ - cancel_delayed_work_sync(&net->login_work); - cancel_work_sync(&net->connected_work); -} - -static inline unsigned int tbnet_frame_size(const struct tbnet_frame *tf) -{ - return tf->frame.size ? : TBNET_FRAME_SIZE; -} - -static void tbnet_free_buffers(struct tbnet_ring *ring) -{ - unsigned int i; - - for (i = 0; i < TBNET_RING_SIZE; i++) { - struct device *dma_dev = tb_ring_dma_device(ring->ring); - struct tbnet_frame *tf = &ring->frames[i]; - enum dma_data_direction dir; - unsigned int order; - size_t size; - - if (!tf->page) - continue; - - if (ring->ring->is_tx) { - dir = DMA_TO_DEVICE; - order = 0; - size = TBNET_FRAME_SIZE; - } else { - dir = DMA_FROM_DEVICE; - order = TBNET_RX_PAGE_ORDER; - size = TBNET_RX_PAGE_SIZE; - } - - if (tf->frame.buffer_phy) - dma_unmap_page(dma_dev, tf->frame.buffer_phy, size, - dir); - - __free_pages(tf->page, order); - tf->page = NULL; - } - - ring->cons = 0; - ring->prod = 0; -} - -static void tbnet_tear_down(struct tbnet *net, bool send_logout) -{ - netif_carrier_off(net->dev); - netif_stop_queue(net->dev); - - stop_login(net); - - mutex_lock(&net->connection_lock); - - if (net->login_sent && net->login_received) { - int ret, retries = TBNET_LOGOUT_RETRIES; - - while (send_logout && retries-- > 0) { - ret = tbnet_logout_request(net); - if (ret != -ETIMEDOUT) - break; - } - - tb_ring_stop(net->rx_ring.ring); - tb_ring_stop(net->tx_ring.ring); - tbnet_free_buffers(&net->rx_ring); - tbnet_free_buffers(&net->tx_ring); - - ret = tb_xdomain_disable_paths(net->xd, - net->local_transmit_path, - net->rx_ring.ring->hop, - net->remote_transmit_path, - net->tx_ring.ring->hop); - if (ret) - netdev_warn(net->dev, "failed to disable DMA paths\n"); - - tb_xdomain_release_in_hopid(net->xd, net->remote_transmit_path); - net->remote_transmit_path = 0; - } - - net->login_retries = 0; - net->login_sent = false; - net->login_received = false; - - mutex_unlock(&net->connection_lock); -} - -static int tbnet_handle_packet(const void *buf, size_t size, void *data) -{ - const struct thunderbolt_ip_login *pkg = buf; - struct tbnet *net = data; - u32 command_id; - int ret = 0; - u32 sequence; - u64 route; - - /* Make sure the packet is for us */ - if (size < sizeof(struct thunderbolt_ip_header)) - return 0; - if (!uuid_equal(&pkg->hdr.initiator_uuid, net->xd->remote_uuid)) - return 0; - if (!uuid_equal(&pkg->hdr.target_uuid, net->xd->local_uuid)) - return 0; - - route = ((u64)pkg->hdr.route_hi << 32) | pkg->hdr.route_lo; - route &= ~BIT_ULL(63); - if (route != net->xd->route) - return 0; - - sequence = pkg->hdr.length_sn & TBIP_HDR_SN_MASK; - sequence >>= TBIP_HDR_SN_SHIFT; - command_id = pkg->hdr.command_id; - - switch (pkg->hdr.type) { - case TBIP_LOGIN: - if (!netif_running(net->dev)) - break; - - ret = tbnet_login_response(net, route, sequence, - pkg->hdr.command_id); - if (!ret) { - mutex_lock(&net->connection_lock); - net->login_received = true; - net->remote_transmit_path = pkg->transmit_path; - - /* If we reached the number of max retries or - * previous logout, schedule another round of - * login retries - */ - if (net->login_retries >= TBNET_LOGIN_RETRIES || - !net->login_sent) { - net->login_retries = 0; - queue_delayed_work(system_long_wq, - &net->login_work, 0); - } - mutex_unlock(&net->connection_lock); - - queue_work(system_long_wq, &net->connected_work); - } - break; - - case TBIP_LOGOUT: - ret = tbnet_logout_response(net, route, sequence, command_id); - if (!ret) - queue_work(system_long_wq, &net->disconnect_work); - break; - - default: - return 0; - } - - if (ret) - netdev_warn(net->dev, "failed to send ThunderboltIP response\n"); - - return 1; -} - -static unsigned int tbnet_available_buffers(const struct tbnet_ring *ring) -{ - return ring->prod - ring->cons; -} - -static int tbnet_alloc_rx_buffers(struct tbnet *net, unsigned int nbuffers) -{ - struct tbnet_ring *ring = &net->rx_ring; - int ret; - - while (nbuffers--) { - struct device *dma_dev = tb_ring_dma_device(ring->ring); - unsigned int index = ring->prod & (TBNET_RING_SIZE - 1); - struct tbnet_frame *tf = &ring->frames[index]; - dma_addr_t dma_addr; - - if (tf->page) - break; - - /* Allocate page (order > 0) so that it can hold maximum - * ThunderboltIP frame (4kB) and the additional room for - * SKB shared info required by build_skb(). - */ - tf->page = dev_alloc_pages(TBNET_RX_PAGE_ORDER); - if (!tf->page) { - ret = -ENOMEM; - goto err_free; - } - - dma_addr = dma_map_page(dma_dev, tf->page, 0, - TBNET_RX_PAGE_SIZE, DMA_FROM_DEVICE); - if (dma_mapping_error(dma_dev, dma_addr)) { - ret = -ENOMEM; - goto err_free; - } - - tf->frame.buffer_phy = dma_addr; - tf->dev = net->dev; - - tb_ring_rx(ring->ring, &tf->frame); - - ring->prod++; - } - - return 0; - -err_free: - tbnet_free_buffers(ring); - return ret; -} - -static struct tbnet_frame *tbnet_get_tx_buffer(struct tbnet *net) -{ - struct tbnet_ring *ring = &net->tx_ring; - struct device *dma_dev = tb_ring_dma_device(ring->ring); - struct tbnet_frame *tf; - unsigned int index; - - if (!tbnet_available_buffers(ring)) - return NULL; - - index = ring->cons++ & (TBNET_RING_SIZE - 1); - - tf = &ring->frames[index]; - tf->frame.size = 0; - - dma_sync_single_for_cpu(dma_dev, tf->frame.buffer_phy, - tbnet_frame_size(tf), DMA_TO_DEVICE); - - return tf; -} - -static void tbnet_tx_callback(struct tb_ring *ring, struct ring_frame *frame, - bool canceled) -{ - struct tbnet_frame *tf = container_of(frame, typeof(*tf), frame); - struct tbnet *net = netdev_priv(tf->dev); - - /* Return buffer to the ring */ - net->tx_ring.prod++; - - if (tbnet_available_buffers(&net->tx_ring) >= TBNET_RING_SIZE / 2) - 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; - - ret = tb_xdomain_alloc_in_hopid(net->xd, net->remote_transmit_path); - if (ret != net->remote_transmit_path) { - netdev_err(net->dev, "failed to allocate Rx HopID\n"); - return; - } - - /* Both logins successful so enable the rings, high-speed DMA - * paths and start the network device queue. - * - * Note we enable the DMA paths last to make sure we have primed - * the Rx ring before any incoming packets are allowed to - * arrive. - */ - 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; - - ret = tb_xdomain_enable_paths(net->xd, net->local_transmit_path, - net->rx_ring.ring->hop, - net->remote_transmit_path, - net->tx_ring.ring->hop); - if (ret) { - netdev_err(net->dev, "failed to enable DMA paths\n"); - goto err_free_tx_buffers; - } - - netif_carrier_on(net->dev); - netif_start_queue(net->dev); - return; - -err_free_tx_buffers: - tbnet_free_buffers(&net->tx_ring); -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); - tb_xdomain_release_in_hopid(net->xd, net->remote_transmit_path); -} - -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; - unsigned int flags; - int hopid; - - 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; - - hopid = tb_xdomain_alloc_out_hopid(xd, -1); - if (hopid < 0) { - netdev_err(dev, "failed to allocate Tx HopID\n"); - tb_ring_free(net->tx_ring.ring); - net->tx_ring.ring = NULL; - return hopid; - } - net->local_transmit_path = hopid; - - sof_mask = BIT(TBIP_PDF_FRAME_START); - eof_mask = BIT(TBIP_PDF_FRAME_END); - - flags = RING_FLAG_FRAME; - /* Only enable full E2E if the other end supports it too */ - if (tbnet_e2e && net->svc->prtcstns & TBNET_E2E) - flags |= RING_FLAG_E2E; - - ring = tb_ring_alloc_rx(xd->tb->nhi, -1, TBNET_RING_SIZE, flags, - net->tx_ring.ring->hop, sof_mask, - eof_mask, tbnet_start_poll, net); - if (!ring) { - netdev_err(dev, "failed to allocate Rx ring\n"); - tb_xdomain_release_out_hopid(xd, hopid); - 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_xdomain_release_out_hopid(net->xd, net->local_transmit_path); - 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_local_page(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_local(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_local(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_local(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 addr[ETH_ALEN]; - u8 phy_port; - u32 hash; - - phy_port = tb_phy_port_from_link(TBNET_L0_PORT_NUM(xd->route)); - - /* Unicast and locally administered MAC */ - addr[0] = phy_port << 4 | 0x02; - hash = jhash2((u32 *)xd->local_uuid, 4, 0); - memcpy(addr + 1, &hash, sizeof(hash)); - hash = jhash2((u32 *)xd->local_uuid, 4, hash); - addr[5] = hash & 0xff; - eth_hw_addr_set(dev, addr); -} - -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); - - /* 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 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 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 DEFINE_SIMPLE_DEV_PM_OPS(tbnet_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 = pm_sleep_ptr(&tbnet_pm_ops), - }, - .probe = tbnet_probe, - .remove = tbnet_remove, - .shutdown = tbnet_shutdown, - .id_table = tbnet_ids, -}; - -static int __init tbnet_init(void) -{ - unsigned int flags; - 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); - - flags = TBNET_MATCH_FRAGS_ID | TBNET_64K_FRAMES; - if (tbnet_e2e) - flags |= TBNET_E2E; - tb_property_add_immediate(tbnet_dir, "prtcstns", flags); - - ret = tb_register_property_dir("network", tbnet_dir); - if (ret) - goto err_free_dir; - - ret = tb_register_service_driver(&tbnet_driver); - if (ret) - goto err_unregister; - - return 0; - -err_unregister: - tb_unregister_property_dir("network", tbnet_dir); -err_free_dir: - tb_property_free_dir(tbnet_dir); - - return ret; -} -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 <amir.jer.levy@intel.com>"); -MODULE_AUTHOR("Michael Jamet <michael.jamet@intel.com>"); -MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>"); -MODULE_DESCRIPTION("Thunderbolt/USB4 network driver"); -MODULE_LICENSE("GPL v2"); |