diff options
Diffstat (limited to 'drivers/net/thunderbolt.c')
| -rw-r--r-- | drivers/net/thunderbolt.c | 64 |
1 files changed, 41 insertions, 23 deletions
diff --git a/drivers/net/thunderbolt.c b/drivers/net/thunderbolt.c index ff5d0e98a088..83fcaeb2ac5e 100644 --- a/drivers/net/thunderbolt.c +++ b/drivers/net/thunderbolt.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Networking over Thunderbolt cable using Apple ThunderboltIP protocol + * Networking over Thunderbolt/USB4 cables using USB4NET protocol + * (formerly Apple ThunderboltIP). * * Copyright (C) 2017, Intel Corporation * Authors: Amir Levy <amir.jer.levy@intel.com> @@ -30,6 +31,7 @@ #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 @@ -209,6 +211,10 @@ static const uuid_t tbnet_svc_uuid = 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) @@ -612,18 +618,13 @@ static void tbnet_connected_work(struct work_struct *work) return; } - /* Both logins successful so enable the high-speed DMA paths and - * start the network device queue. + /* 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. */ - 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"); - return; - } - tb_ring_start(net->tx_ring.ring); tb_ring_start(net->rx_ring.ring); @@ -635,10 +636,21 @@ static void tbnet_connected_work(struct work_struct *work) 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: @@ -867,6 +879,7 @@ static int tbnet_open(struct net_device *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); @@ -891,9 +904,14 @@ static int tbnet_open(struct net_device *dev) 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); + 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_ring_free(net->tx_ring.ring); @@ -1264,7 +1282,7 @@ static int tbnet_probe(struct tb_service *svc, const struct tb_service_id *id) 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); + netif_napi_add(dev, &net->napi, tbnet_poll); /* MTU range: 68 - 65522 */ dev->min_mtu = ETH_MIN_MTU; @@ -1356,6 +1374,7 @@ static struct tb_service_driver tbnet_driver = { static int __init tbnet_init(void) { + unsigned int flags; int ret; tbnet_dir = tb_property_create_dir(&tbnet_dir_uuid); @@ -1365,12 +1384,11 @@ static int __init tbnet_init(void) 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 | TBNET_64K_FRAMES); + + 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) { @@ -1393,5 +1411,5 @@ 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 network driver"); +MODULE_DESCRIPTION("Thunderbolt/USB4 network driver"); MODULE_LICENSE("GPL v2"); |