blob: 9c7a9a2a1f252a706fd96251b5662fa80d152001 [file] [log] [blame]
// 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,
&param, 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]);
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);
}