484 lines
13 KiB
C
484 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2020-21 Intel Corporation.
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*/
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#include "iosm_ipc_mux_codec.h"
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/* At the begin of the runtime phase the IP MUX channel shall created. */
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static int ipc_mux_channel_create(struct iosm_mux *ipc_mux)
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{
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int channel_id;
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channel_id = ipc_imem_channel_alloc(ipc_mux->imem, ipc_mux->instance_id,
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IPC_CTYPE_WWAN);
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if (channel_id < 0) {
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dev_err(ipc_mux->dev,
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"allocation of the MUX channel id failed");
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ipc_mux->state = MUX_S_ERROR;
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ipc_mux->event = MUX_E_NOT_APPLICABLE;
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goto no_channel;
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}
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/* Establish the MUX channel in blocking mode. */
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ipc_mux->channel = ipc_imem_channel_open(ipc_mux->imem, channel_id,
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IPC_HP_NET_CHANNEL_INIT);
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if (!ipc_mux->channel) {
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dev_err(ipc_mux->dev, "ipc_imem_channel_open failed");
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ipc_mux->state = MUX_S_ERROR;
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ipc_mux->event = MUX_E_NOT_APPLICABLE;
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return -ENODEV; /* MUX channel is not available. */
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}
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/* Define the MUX active state properties. */
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ipc_mux->state = MUX_S_ACTIVE;
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ipc_mux->event = MUX_E_NO_ORDERS;
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no_channel:
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return channel_id;
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}
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/* Reset the session/if id state. */
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static void ipc_mux_session_free(struct iosm_mux *ipc_mux, int if_id)
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{
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struct mux_session *if_entry;
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if_entry = &ipc_mux->session[if_id];
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/* Reset the session state. */
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if_entry->wwan = NULL;
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}
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/* Create and send the session open command. */
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static struct mux_cmd_open_session_resp *
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ipc_mux_session_open_send(struct iosm_mux *ipc_mux, int if_id)
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{
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struct mux_cmd_open_session_resp *open_session_resp;
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struct mux_acb *acb = &ipc_mux->acb;
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union mux_cmd_param param;
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/* open_session commands to one ACB and start transmission. */
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param.open_session.flow_ctrl = 0;
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param.open_session.ipv4v6_hints = 0;
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param.open_session.reserved2 = 0;
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param.open_session.dl_head_pad_len = cpu_to_le32(IPC_MEM_DL_ETH_OFFSET);
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/* Finish and transfer ACB. The user thread is suspended.
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* It is a blocking function call, until CP responds or timeout.
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*/
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acb->wanted_response = MUX_CMD_OPEN_SESSION_RESP;
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if (ipc_mux_dl_acb_send_cmds(ipc_mux, MUX_CMD_OPEN_SESSION, if_id, 0,
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¶m, sizeof(param.open_session), true,
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false) ||
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acb->got_response != MUX_CMD_OPEN_SESSION_RESP) {
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dev_err(ipc_mux->dev, "if_id %d: OPEN_SESSION send failed",
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if_id);
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return NULL;
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}
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open_session_resp = &ipc_mux->acb.got_param.open_session_resp;
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if (open_session_resp->response != cpu_to_le32(MUX_CMD_RESP_SUCCESS)) {
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dev_err(ipc_mux->dev,
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"if_id %d,session open failed,response=%d", if_id,
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open_session_resp->response);
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return NULL;
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}
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return open_session_resp;
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}
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/* Open the first IP session. */
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static bool ipc_mux_session_open(struct iosm_mux *ipc_mux,
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struct mux_session_open *session_open)
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{
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struct mux_cmd_open_session_resp *open_session_resp;
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int if_id;
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/* Search for a free session interface id. */
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if_id = le32_to_cpu(session_open->if_id);
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if (if_id < 0 || if_id >= IPC_MEM_MUX_IP_SESSION_ENTRIES) {
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dev_err(ipc_mux->dev, "invalid interface id=%d", if_id);
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return false;
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}
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/* Create and send the session open command.
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* It is a blocking function call, until CP responds or timeout.
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*/
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open_session_resp = ipc_mux_session_open_send(ipc_mux, if_id);
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if (!open_session_resp) {
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ipc_mux_session_free(ipc_mux, if_id);
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session_open->if_id = cpu_to_le32(-1);
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return false;
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}
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/* Initialize the uplink skb accumulator. */
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skb_queue_head_init(&ipc_mux->session[if_id].ul_list);
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ipc_mux->session[if_id].dl_head_pad_len = IPC_MEM_DL_ETH_OFFSET;
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ipc_mux->session[if_id].ul_head_pad_len =
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le32_to_cpu(open_session_resp->ul_head_pad_len);
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ipc_mux->session[if_id].wwan = ipc_mux->wwan;
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/* Reset the flow ctrl stats of the session */
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ipc_mux->session[if_id].flow_ctl_en_cnt = 0;
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ipc_mux->session[if_id].flow_ctl_dis_cnt = 0;
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ipc_mux->session[if_id].ul_flow_credits = 0;
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ipc_mux->session[if_id].net_tx_stop = false;
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ipc_mux->session[if_id].flow_ctl_mask = 0;
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/* Save and return the assigned if id. */
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session_open->if_id = cpu_to_le32(if_id);
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ipc_mux->nr_sessions++;
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return true;
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}
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/* Free pending session UL packet. */
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static void ipc_mux_session_reset(struct iosm_mux *ipc_mux, int if_id)
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{
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/* Reset the session/if id state. */
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ipc_mux_session_free(ipc_mux, if_id);
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/* Empty the uplink skb accumulator. */
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skb_queue_purge(&ipc_mux->session[if_id].ul_list);
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}
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static void ipc_mux_session_close(struct iosm_mux *ipc_mux,
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struct mux_session_close *msg)
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{
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int if_id;
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/* Copy the session interface id. */
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if_id = le32_to_cpu(msg->if_id);
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if (if_id < 0 || if_id >= IPC_MEM_MUX_IP_SESSION_ENTRIES) {
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dev_err(ipc_mux->dev, "invalid session id %d", if_id);
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return;
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}
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/* Create and send the session close command.
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* It is a blocking function call, until CP responds or timeout.
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*/
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if (ipc_mux_dl_acb_send_cmds(ipc_mux, MUX_CMD_CLOSE_SESSION, if_id, 0,
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NULL, 0, true, false))
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dev_err(ipc_mux->dev, "if_id %d: CLOSE_SESSION send failed",
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if_id);
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/* Reset the flow ctrl stats of the session */
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ipc_mux->session[if_id].flow_ctl_en_cnt = 0;
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ipc_mux->session[if_id].flow_ctl_dis_cnt = 0;
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ipc_mux->session[if_id].flow_ctl_mask = 0;
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ipc_mux_session_reset(ipc_mux, if_id);
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ipc_mux->nr_sessions--;
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}
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static void ipc_mux_channel_close(struct iosm_mux *ipc_mux,
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struct mux_channel_close *channel_close_p)
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{
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int i;
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/* Free pending session UL packet. */
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for (i = 0; i < IPC_MEM_MUX_IP_SESSION_ENTRIES; i++)
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if (ipc_mux->session[i].wwan)
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ipc_mux_session_reset(ipc_mux, i);
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ipc_imem_channel_close(ipc_mux->imem, ipc_mux->channel_id);
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/* Reset the MUX object. */
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ipc_mux->state = MUX_S_INACTIVE;
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ipc_mux->event = MUX_E_INACTIVE;
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}
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/* CP has interrupted AP. If AP is in IP MUX mode, execute the pending ops. */
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static int ipc_mux_schedule(struct iosm_mux *ipc_mux, union mux_msg *msg)
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{
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enum mux_event order;
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bool success;
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int ret = -EIO;
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if (!ipc_mux->initialized) {
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ret = -EAGAIN;
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goto out;
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}
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order = msg->common.event;
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switch (ipc_mux->state) {
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case MUX_S_INACTIVE:
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if (order != MUX_E_MUX_SESSION_OPEN)
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goto out; /* Wait for the request to open a session */
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if (ipc_mux->event == MUX_E_INACTIVE)
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/* Establish the MUX channel and the new state. */
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ipc_mux->channel_id = ipc_mux_channel_create(ipc_mux);
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if (ipc_mux->state != MUX_S_ACTIVE) {
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ret = ipc_mux->channel_id; /* Missing the MUX channel */
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goto out;
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}
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/* Disable the TD update timer and open the first IP session. */
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ipc_imem_td_update_timer_suspend(ipc_mux->imem, true);
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ipc_mux->event = MUX_E_MUX_SESSION_OPEN;
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success = ipc_mux_session_open(ipc_mux, &msg->session_open);
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ipc_imem_td_update_timer_suspend(ipc_mux->imem, false);
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if (success)
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ret = ipc_mux->channel_id;
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goto out;
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case MUX_S_ACTIVE:
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switch (order) {
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case MUX_E_MUX_SESSION_OPEN:
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/* Disable the TD update timer and open a session */
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ipc_imem_td_update_timer_suspend(ipc_mux->imem, true);
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ipc_mux->event = MUX_E_MUX_SESSION_OPEN;
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success = ipc_mux_session_open(ipc_mux,
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&msg->session_open);
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ipc_imem_td_update_timer_suspend(ipc_mux->imem, false);
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if (success)
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ret = ipc_mux->channel_id;
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goto out;
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case MUX_E_MUX_SESSION_CLOSE:
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/* Release an IP session. */
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ipc_mux->event = MUX_E_MUX_SESSION_CLOSE;
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ipc_mux_session_close(ipc_mux, &msg->session_close);
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if (!ipc_mux->nr_sessions) {
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ipc_mux->event = MUX_E_MUX_CHANNEL_CLOSE;
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ipc_mux_channel_close(ipc_mux,
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&msg->channel_close);
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}
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ret = ipc_mux->channel_id;
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goto out;
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case MUX_E_MUX_CHANNEL_CLOSE:
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/* Close the MUX channel pipes. */
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ipc_mux->event = MUX_E_MUX_CHANNEL_CLOSE;
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ipc_mux_channel_close(ipc_mux, &msg->channel_close);
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ret = ipc_mux->channel_id;
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goto out;
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default:
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/* Invalid order. */
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goto out;
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}
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default:
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dev_err(ipc_mux->dev,
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"unexpected MUX transition: state=%d, event=%d",
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ipc_mux->state, ipc_mux->event);
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}
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out:
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return ret;
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}
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struct iosm_mux *ipc_mux_init(struct ipc_mux_config *mux_cfg,
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struct iosm_imem *imem)
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{
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struct iosm_mux *ipc_mux = kzalloc(sizeof(*ipc_mux), GFP_KERNEL);
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int i, j, ul_tds, ul_td_size;
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struct sk_buff_head *free_list;
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struct sk_buff *skb;
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int qlt_size;
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if (!ipc_mux)
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return NULL;
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ipc_mux->protocol = mux_cfg->protocol;
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ipc_mux->ul_flow = mux_cfg->ul_flow;
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ipc_mux->instance_id = mux_cfg->instance_id;
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ipc_mux->wwan_q_offset = 0;
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ipc_mux->pcie = imem->pcie;
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ipc_mux->imem = imem;
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ipc_mux->ipc_protocol = imem->ipc_protocol;
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ipc_mux->dev = imem->dev;
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ipc_mux->wwan = imem->wwan;
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/* Get the reference to the UL ADB list. */
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free_list = &ipc_mux->ul_adb.free_list;
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/* Initialize the list with free ADB. */
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skb_queue_head_init(free_list);
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ul_td_size = IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE;
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ul_tds = IPC_MEM_MAX_TDS_MUX_LITE_UL;
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ipc_mux->ul_adb.dest_skb = NULL;
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ipc_mux->initialized = true;
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ipc_mux->adb_prep_ongoing = false;
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ipc_mux->size_needed = 0;
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ipc_mux->ul_data_pend_bytes = 0;
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ipc_mux->state = MUX_S_INACTIVE;
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ipc_mux->ev_mux_net_transmit_pending = false;
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ipc_mux->tx_transaction_id = 0;
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ipc_mux->rr_next_session = 0;
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ipc_mux->event = MUX_E_INACTIVE;
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ipc_mux->channel_id = -1;
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ipc_mux->channel = NULL;
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if (ipc_mux->protocol != MUX_LITE) {
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qlt_size = offsetof(struct mux_qlth, ql) +
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MUX_QUEUE_LEVEL * sizeof(struct mux_qlth_ql);
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for (i = 0; i < IPC_MEM_MUX_IP_SESSION_ENTRIES; i++) {
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ipc_mux->ul_adb.pp_qlt[i] = kzalloc(qlt_size,
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GFP_ATOMIC);
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if (!ipc_mux->ul_adb.pp_qlt[i]) {
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for (j = i - 1; j >= 0; j--)
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kfree(ipc_mux->ul_adb.pp_qlt[j]);
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kfree(ipc_mux);
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return NULL;
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}
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}
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ul_td_size = IPC_MEM_MAX_UL_ADB_BUF_SIZE;
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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);
|
||
|
|
}
|