From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/net/wwan/iosm/iosm_ipc_mux.c | 483 +++++++++++++++++++++++++++++++++++ 1 file changed, 483 insertions(+) create mode 100644 drivers/net/wwan/iosm/iosm_ipc_mux.c (limited to 'drivers/net/wwan/iosm/iosm_ipc_mux.c') diff --git a/drivers/net/wwan/iosm/iosm_ipc_mux.c b/drivers/net/wwan/iosm/iosm_ipc_mux.c new file mode 100644 index 000000000..fc928b298 --- /dev/null +++ b/drivers/net/wwan/iosm/iosm_ipc_mux.c @@ -0,0 +1,483 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2020-21 Intel Corporation. + */ + +#include "iosm_ipc_mux_codec.h" + +/* At the begin of the runtime phase the IP MUX channel shall created. */ +static int ipc_mux_channel_create(struct iosm_mux *ipc_mux) +{ + int channel_id; + + channel_id = ipc_imem_channel_alloc(ipc_mux->imem, ipc_mux->instance_id, + IPC_CTYPE_WWAN); + + if (channel_id < 0) { + dev_err(ipc_mux->dev, + "allocation of the MUX channel id failed"); + ipc_mux->state = MUX_S_ERROR; + ipc_mux->event = MUX_E_NOT_APPLICABLE; + goto no_channel; + } + + /* Establish the MUX channel in blocking mode. */ + ipc_mux->channel = ipc_imem_channel_open(ipc_mux->imem, channel_id, + IPC_HP_NET_CHANNEL_INIT); + + if (!ipc_mux->channel) { + dev_err(ipc_mux->dev, "ipc_imem_channel_open failed"); + ipc_mux->state = MUX_S_ERROR; + ipc_mux->event = MUX_E_NOT_APPLICABLE; + return -ENODEV; /* MUX channel is not available. */ + } + + /* Define the MUX active state properties. */ + ipc_mux->state = MUX_S_ACTIVE; + ipc_mux->event = MUX_E_NO_ORDERS; + +no_channel: + return channel_id; +} + +/* Reset the session/if id state. */ +static void ipc_mux_session_free(struct iosm_mux *ipc_mux, int if_id) +{ + struct mux_session *if_entry; + + if_entry = &ipc_mux->session[if_id]; + /* Reset the session state. */ + if_entry->wwan = NULL; +} + +/* Create and send the session open command. */ +static struct mux_cmd_open_session_resp * +ipc_mux_session_open_send(struct iosm_mux *ipc_mux, int if_id) +{ + struct mux_cmd_open_session_resp *open_session_resp; + struct mux_acb *acb = &ipc_mux->acb; + union mux_cmd_param param; + + /* open_session commands to one ACB and start transmission. */ + param.open_session.flow_ctrl = 0; + param.open_session.ipv4v6_hints = 0; + param.open_session.reserved2 = 0; + param.open_session.dl_head_pad_len = cpu_to_le32(IPC_MEM_DL_ETH_OFFSET); + + /* Finish and transfer ACB. The user thread is suspended. + * It is a blocking function call, until CP responds or timeout. + */ + acb->wanted_response = MUX_CMD_OPEN_SESSION_RESP; + if (ipc_mux_dl_acb_send_cmds(ipc_mux, MUX_CMD_OPEN_SESSION, if_id, 0, + ¶m, sizeof(param.open_session), true, + false) || + acb->got_response != MUX_CMD_OPEN_SESSION_RESP) { + dev_err(ipc_mux->dev, "if_id %d: OPEN_SESSION send failed", + if_id); + return NULL; + } + + open_session_resp = &ipc_mux->acb.got_param.open_session_resp; + if (open_session_resp->response != cpu_to_le32(MUX_CMD_RESP_SUCCESS)) { + dev_err(ipc_mux->dev, + "if_id %d,session open failed,response=%d", if_id, + open_session_resp->response); + return NULL; + } + + return open_session_resp; +} + +/* Open the first IP session. */ +static bool ipc_mux_session_open(struct iosm_mux *ipc_mux, + struct mux_session_open *session_open) +{ + struct mux_cmd_open_session_resp *open_session_resp; + int if_id; + + /* Search for a free session interface id. */ + if_id = le32_to_cpu(session_open->if_id); + if (if_id < 0 || if_id >= IPC_MEM_MUX_IP_SESSION_ENTRIES) { + dev_err(ipc_mux->dev, "invalid interface id=%d", if_id); + return false; + } + + /* Create and send the session open command. + * It is a blocking function call, until CP responds or timeout. + */ + open_session_resp = ipc_mux_session_open_send(ipc_mux, if_id); + if (!open_session_resp) { + ipc_mux_session_free(ipc_mux, if_id); + session_open->if_id = cpu_to_le32(-1); + return false; + } + + /* Initialize the uplink skb accumulator. */ + skb_queue_head_init(&ipc_mux->session[if_id].ul_list); + + ipc_mux->session[if_id].dl_head_pad_len = IPC_MEM_DL_ETH_OFFSET; + ipc_mux->session[if_id].ul_head_pad_len = + le32_to_cpu(open_session_resp->ul_head_pad_len); + ipc_mux->session[if_id].wwan = ipc_mux->wwan; + + /* Reset the flow ctrl stats of the session */ + ipc_mux->session[if_id].flow_ctl_en_cnt = 0; + ipc_mux->session[if_id].flow_ctl_dis_cnt = 0; + ipc_mux->session[if_id].ul_flow_credits = 0; + ipc_mux->session[if_id].net_tx_stop = false; + ipc_mux->session[if_id].flow_ctl_mask = 0; + + /* Save and return the assigned if id. */ + session_open->if_id = cpu_to_le32(if_id); + ipc_mux->nr_sessions++; + + return true; +} + +/* Free pending session UL packet. */ +static void ipc_mux_session_reset(struct iosm_mux *ipc_mux, int if_id) +{ + /* Reset the session/if id state. */ + ipc_mux_session_free(ipc_mux, if_id); + + /* Empty the uplink skb accumulator. */ + skb_queue_purge(&ipc_mux->session[if_id].ul_list); +} + +static void ipc_mux_session_close(struct iosm_mux *ipc_mux, + struct mux_session_close *msg) +{ + int if_id; + + /* Copy the session interface id. */ + if_id = le32_to_cpu(msg->if_id); + + if (if_id < 0 || if_id >= IPC_MEM_MUX_IP_SESSION_ENTRIES) { + dev_err(ipc_mux->dev, "invalid session id %d", if_id); + return; + } + + /* Create and send the session close command. + * It is a blocking function call, until CP responds or timeout. + */ + if (ipc_mux_dl_acb_send_cmds(ipc_mux, MUX_CMD_CLOSE_SESSION, if_id, 0, + NULL, 0, true, false)) + dev_err(ipc_mux->dev, "if_id %d: CLOSE_SESSION send failed", + if_id); + + /* Reset the flow ctrl stats of the session */ + ipc_mux->session[if_id].flow_ctl_en_cnt = 0; + ipc_mux->session[if_id].flow_ctl_dis_cnt = 0; + ipc_mux->session[if_id].flow_ctl_mask = 0; + + ipc_mux_session_reset(ipc_mux, if_id); + ipc_mux->nr_sessions--; +} + +static void ipc_mux_channel_close(struct iosm_mux *ipc_mux, + struct mux_channel_close *channel_close_p) +{ + int i; + + /* Free pending session UL packet. */ + for (i = 0; i < IPC_MEM_MUX_IP_SESSION_ENTRIES; i++) + if (ipc_mux->session[i].wwan) + ipc_mux_session_reset(ipc_mux, i); + + ipc_imem_channel_close(ipc_mux->imem, ipc_mux->channel_id); + + /* Reset the MUX object. */ + ipc_mux->state = MUX_S_INACTIVE; + ipc_mux->event = MUX_E_INACTIVE; +} + +/* CP has interrupted AP. If AP is in IP MUX mode, execute the pending ops. */ +static int ipc_mux_schedule(struct iosm_mux *ipc_mux, union mux_msg *msg) +{ + enum mux_event order; + bool success; + int ret = -EIO; + + if (!ipc_mux->initialized) { + ret = -EAGAIN; + goto out; + } + + order = msg->common.event; + + switch (ipc_mux->state) { + case MUX_S_INACTIVE: + if (order != MUX_E_MUX_SESSION_OPEN) + goto out; /* Wait for the request to open a session */ + + if (ipc_mux->event == MUX_E_INACTIVE) + /* Establish the MUX channel and the new state. */ + ipc_mux->channel_id = ipc_mux_channel_create(ipc_mux); + + if (ipc_mux->state != MUX_S_ACTIVE) { + ret = ipc_mux->channel_id; /* Missing the MUX channel */ + goto out; + } + + /* Disable the TD update timer and open the first IP session. */ + ipc_imem_td_update_timer_suspend(ipc_mux->imem, true); + ipc_mux->event = MUX_E_MUX_SESSION_OPEN; + success = ipc_mux_session_open(ipc_mux, &msg->session_open); + + ipc_imem_td_update_timer_suspend(ipc_mux->imem, false); + if (success) + ret = ipc_mux->channel_id; + goto out; + + case MUX_S_ACTIVE: + switch (order) { + case MUX_E_MUX_SESSION_OPEN: + /* Disable the TD update timer and open a session */ + ipc_imem_td_update_timer_suspend(ipc_mux->imem, true); + ipc_mux->event = MUX_E_MUX_SESSION_OPEN; + success = ipc_mux_session_open(ipc_mux, + &msg->session_open); + ipc_imem_td_update_timer_suspend(ipc_mux->imem, false); + if (success) + ret = ipc_mux->channel_id; + goto out; + + case MUX_E_MUX_SESSION_CLOSE: + /* Release an IP session. */ + ipc_mux->event = MUX_E_MUX_SESSION_CLOSE; + ipc_mux_session_close(ipc_mux, &msg->session_close); + if (!ipc_mux->nr_sessions) { + ipc_mux->event = MUX_E_MUX_CHANNEL_CLOSE; + ipc_mux_channel_close(ipc_mux, + &msg->channel_close); + } + ret = ipc_mux->channel_id; + goto out; + + case MUX_E_MUX_CHANNEL_CLOSE: + /* Close the MUX channel pipes. */ + ipc_mux->event = MUX_E_MUX_CHANNEL_CLOSE; + ipc_mux_channel_close(ipc_mux, &msg->channel_close); + ret = ipc_mux->channel_id; + goto out; + + default: + /* Invalid order. */ + goto out; + } + + default: + dev_err(ipc_mux->dev, + "unexpected MUX transition: state=%d, event=%d", + ipc_mux->state, ipc_mux->event); + } +out: + return ret; +} + +struct iosm_mux *ipc_mux_init(struct ipc_mux_config *mux_cfg, + struct iosm_imem *imem) +{ + struct iosm_mux *ipc_mux = kzalloc(sizeof(*ipc_mux), GFP_KERNEL); + int i, j, ul_tds, ul_td_size; + struct sk_buff_head *free_list; + struct sk_buff *skb; + int qlt_size; + + if (!ipc_mux) + return NULL; + + ipc_mux->protocol = mux_cfg->protocol; + ipc_mux->ul_flow = mux_cfg->ul_flow; + ipc_mux->instance_id = mux_cfg->instance_id; + ipc_mux->wwan_q_offset = 0; + + ipc_mux->pcie = imem->pcie; + ipc_mux->imem = imem; + ipc_mux->ipc_protocol = imem->ipc_protocol; + ipc_mux->dev = imem->dev; + ipc_mux->wwan = imem->wwan; + + /* Get the reference to the UL ADB list. */ + free_list = &ipc_mux->ul_adb.free_list; + + /* Initialize the list with free ADB. */ + skb_queue_head_init(free_list); + + ul_td_size = IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE; + + ul_tds = IPC_MEM_MAX_TDS_MUX_LITE_UL; + + ipc_mux->ul_adb.dest_skb = NULL; + + ipc_mux->initialized = true; + ipc_mux->adb_prep_ongoing = false; + ipc_mux->size_needed = 0; + ipc_mux->ul_data_pend_bytes = 0; + ipc_mux->state = MUX_S_INACTIVE; + ipc_mux->ev_mux_net_transmit_pending = false; + ipc_mux->tx_transaction_id = 0; + ipc_mux->rr_next_session = 0; + ipc_mux->event = MUX_E_INACTIVE; + ipc_mux->channel_id = -1; + ipc_mux->channel = NULL; + + if (ipc_mux->protocol != MUX_LITE) { + qlt_size = offsetof(struct mux_qlth, ql) + + MUX_QUEUE_LEVEL * sizeof(struct mux_qlth_ql); + + for (i = 0; i < IPC_MEM_MUX_IP_SESSION_ENTRIES; i++) { + ipc_mux->ul_adb.pp_qlt[i] = kzalloc(qlt_size, + GFP_ATOMIC); + if (!ipc_mux->ul_adb.pp_qlt[i]) { + for (j = i - 1; j >= 0; j--) + kfree(ipc_mux->ul_adb.pp_qlt[j]); + kfree(ipc_mux); + return NULL; + } + } + + ul_td_size = IPC_MEM_MAX_UL_ADB_BUF_SIZE; + ul_tds = IPC_MEM_MAX_TDS_MUX_AGGR_UL; + } + + /* Allocate the list of UL ADB. */ + for (i = 0; i < ul_tds; i++) { + dma_addr_t mapping; + + skb = ipc_pcie_alloc_skb(ipc_mux->pcie, ul_td_size, GFP_ATOMIC, + &mapping, DMA_TO_DEVICE, 0); + if (!skb) { + ipc_mux_deinit(ipc_mux); + return NULL; + } + /* Extend the UL ADB list. */ + skb_queue_tail(free_list, skb); + } + + return ipc_mux; +} + +/* Informs the network stack to restart transmission for all opened session if + * Flow Control is not ON for that session. + */ +static void ipc_mux_restart_tx_for_all_sessions(struct iosm_mux *ipc_mux) +{ + struct mux_session *session; + int idx; + + for (idx = 0; idx < IPC_MEM_MUX_IP_SESSION_ENTRIES; idx++) { + session = &ipc_mux->session[idx]; + + if (!session->wwan) + continue; + + /* If flow control of the session is OFF and if there was tx + * stop then restart. Inform the network interface to restart + * sending data. + */ + if (session->flow_ctl_mask == 0) { + session->net_tx_stop = false; + ipc_mux_netif_tx_flowctrl(session, idx, false); + } + } +} + +/* Informs the network stack to stop sending further pkt for all opened + * sessions + */ +static void ipc_mux_stop_netif_for_all_sessions(struct iosm_mux *ipc_mux) +{ + struct mux_session *session; + int idx; + + for (idx = 0; idx < IPC_MEM_MUX_IP_SESSION_ENTRIES; idx++) { + session = &ipc_mux->session[idx]; + + if (!session->wwan) + continue; + + ipc_mux_netif_tx_flowctrl(session, session->if_id, true); + } +} + +void ipc_mux_check_n_restart_tx(struct iosm_mux *ipc_mux) +{ + if (ipc_mux->ul_flow == MUX_UL) { + int low_thresh = IPC_MEM_MUX_UL_FLOWCTRL_LOW_B; + + if (ipc_mux->ul_data_pend_bytes < low_thresh) + ipc_mux_restart_tx_for_all_sessions(ipc_mux); + } +} + +int ipc_mux_get_max_sessions(struct iosm_mux *ipc_mux) +{ + return ipc_mux ? IPC_MEM_MUX_IP_SESSION_ENTRIES : -EFAULT; +} + +enum ipc_mux_protocol ipc_mux_get_active_protocol(struct iosm_mux *ipc_mux) +{ + return ipc_mux ? ipc_mux->protocol : MUX_UNKNOWN; +} + +int ipc_mux_open_session(struct iosm_mux *ipc_mux, int session_nr) +{ + struct mux_session_open *session_open; + union mux_msg mux_msg; + + session_open = &mux_msg.session_open; + session_open->event = MUX_E_MUX_SESSION_OPEN; + + session_open->if_id = cpu_to_le32(session_nr); + ipc_mux->session[session_nr].flags |= IPC_MEM_WWAN_MUX; + return ipc_mux_schedule(ipc_mux, &mux_msg); +} + +int ipc_mux_close_session(struct iosm_mux *ipc_mux, int session_nr) +{ + struct mux_session_close *session_close; + union mux_msg mux_msg; + int ret_val; + + session_close = &mux_msg.session_close; + session_close->event = MUX_E_MUX_SESSION_CLOSE; + + session_close->if_id = cpu_to_le32(session_nr); + ret_val = ipc_mux_schedule(ipc_mux, &mux_msg); + ipc_mux->session[session_nr].flags &= ~IPC_MEM_WWAN_MUX; + + return ret_val; +} + +void ipc_mux_deinit(struct iosm_mux *ipc_mux) +{ + struct mux_channel_close *channel_close; + struct sk_buff_head *free_list; + union mux_msg mux_msg; + struct sk_buff *skb; + + if (!ipc_mux->initialized) + return; + ipc_mux_stop_netif_for_all_sessions(ipc_mux); + + if (ipc_mux->state == MUX_S_ACTIVE) { + channel_close = &mux_msg.channel_close; + channel_close->event = MUX_E_MUX_CHANNEL_CLOSE; + ipc_mux_schedule(ipc_mux, &mux_msg); + } + + /* Empty the ADB free list. */ + free_list = &ipc_mux->ul_adb.free_list; + + /* Remove from the head of the downlink queue. */ + while ((skb = skb_dequeue(free_list))) + ipc_pcie_kfree_skb(ipc_mux->pcie, skb); + + if (ipc_mux->channel) { + ipc_mux->channel->ul_pipe.is_open = false; + ipc_mux->channel->dl_pipe.is_open = false; + } + + kfree(ipc_mux); +} -- cgit v1.2.3