mirror of
https://github.com/torvalds/linux
synced 2024-10-20 18:28:21 +00:00
net: iosm: multiplex IP sessions
Establish IP session between host-device & session management. Signed-off-by: M Chetan Kumar <m.chetan.kumar@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
3b575260cb
commit
51c45fa954
455
drivers/net/wwan/iosm/iosm_ipc_mux.c
Normal file
455
drivers/net/wwan/iosm/iosm_ipc_mux.c
Normal file
|
@ -0,0 +1,455 @@
|
|||
// 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_mux->nr_sessions) {
|
||||
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);
|
||||
|
||||
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_mux->nr_sessions) {
|
||||
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);
|
||||
}
|
||||
|
||||
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_mux->nr_sessions; 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);
|
||||
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, ul_tds, ul_td_size;
|
||||
struct sk_buff_head *free_list;
|
||||
struct sk_buff *skb;
|
||||
|
||||
if (!ipc_mux)
|
||||
return NULL;
|
||||
|
||||
ipc_mux->protocol = mux_cfg->protocol;
|
||||
ipc_mux->ul_flow = mux_cfg->ul_flow;
|
||||
ipc_mux->nr_sessions = mux_cfg->nr_sessions;
|
||||
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;
|
||||
|
||||
/* 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_mux->nr_sessions; 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_mux->nr_sessions; 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_mux->nr_sessions : -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);
|
||||
|
||||
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);
|
||||
}
|
343
drivers/net/wwan/iosm/iosm_ipc_mux.h
Normal file
343
drivers/net/wwan/iosm/iosm_ipc_mux.h
Normal file
|
@ -0,0 +1,343 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0-only
|
||||
*
|
||||
* Copyright (C) 2020-21 Intel Corporation.
|
||||
*/
|
||||
|
||||
#ifndef IOSM_IPC_MUX_H
|
||||
#define IOSM_IPC_MUX_H
|
||||
|
||||
#include "iosm_ipc_protocol.h"
|
||||
|
||||
/* Size of the buffer for the IP MUX data buffer. */
|
||||
#define IPC_MEM_MAX_DL_MUX_BUF_SIZE (16 * 1024)
|
||||
#define IPC_MEM_MAX_UL_ADB_BUF_SIZE IPC_MEM_MAX_DL_MUX_BUF_SIZE
|
||||
|
||||
/* Size of the buffer for the IP MUX Lite data buffer. */
|
||||
#define IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE (2 * 1024)
|
||||
|
||||
/* TD counts for IP MUX Lite */
|
||||
#define IPC_MEM_MAX_TDS_MUX_LITE_UL 800
|
||||
#define IPC_MEM_MAX_TDS_MUX_LITE_DL 1200
|
||||
|
||||
/* open session request (AP->CP) */
|
||||
#define MUX_CMD_OPEN_SESSION 1
|
||||
|
||||
/* response to open session request (CP->AP) */
|
||||
#define MUX_CMD_OPEN_SESSION_RESP 2
|
||||
|
||||
/* close session request (AP->CP) */
|
||||
#define MUX_CMD_CLOSE_SESSION 3
|
||||
|
||||
/* response to close session request (CP->AP) */
|
||||
#define MUX_CMD_CLOSE_SESSION_RESP 4
|
||||
|
||||
/* Flow control command with mask of the flow per queue/flow. */
|
||||
#define MUX_LITE_CMD_FLOW_CTL 5
|
||||
|
||||
/* ACK the flow control command. Shall have the same Transaction ID as the
|
||||
* matching FLOW_CTL command.
|
||||
*/
|
||||
#define MUX_LITE_CMD_FLOW_CTL_ACK 6
|
||||
|
||||
/* Command for report packet indicating link quality metrics. */
|
||||
#define MUX_LITE_CMD_LINK_STATUS_REPORT 7
|
||||
|
||||
/* Response to a report packet */
|
||||
#define MUX_LITE_CMD_LINK_STATUS_REPORT_RESP 8
|
||||
|
||||
/* Used to reset a command/response state. */
|
||||
#define MUX_CMD_INVALID 255
|
||||
|
||||
/* command response : command processed successfully */
|
||||
#define MUX_CMD_RESP_SUCCESS 0
|
||||
|
||||
/* MUX for route link devices */
|
||||
#define IPC_MEM_WWAN_MUX BIT(0)
|
||||
|
||||
/* Initiated actions to change the state of the MUX object. */
|
||||
enum mux_event {
|
||||
MUX_E_INACTIVE, /* No initiated actions. */
|
||||
MUX_E_MUX_SESSION_OPEN, /* Create the MUX channel and a session. */
|
||||
MUX_E_MUX_SESSION_CLOSE, /* Release a session. */
|
||||
MUX_E_MUX_CHANNEL_CLOSE, /* Release the MUX channel. */
|
||||
MUX_E_NO_ORDERS, /* No MUX order. */
|
||||
MUX_E_NOT_APPLICABLE, /* Defect IP MUX. */
|
||||
};
|
||||
|
||||
/* MUX session open command. */
|
||||
struct mux_session_open {
|
||||
enum mux_event event;
|
||||
__le32 if_id;
|
||||
};
|
||||
|
||||
/* MUX session close command. */
|
||||
struct mux_session_close {
|
||||
enum mux_event event;
|
||||
__le32 if_id;
|
||||
};
|
||||
|
||||
/* MUX channel close command. */
|
||||
struct mux_channel_close {
|
||||
enum mux_event event;
|
||||
};
|
||||
|
||||
/* Default message type to find out the right message type. */
|
||||
struct mux_common {
|
||||
enum mux_event event;
|
||||
};
|
||||
|
||||
/* List of ops in MUX mode. */
|
||||
union mux_msg {
|
||||
struct mux_session_open session_open;
|
||||
struct mux_session_close session_close;
|
||||
struct mux_channel_close channel_close;
|
||||
struct mux_common common;
|
||||
};
|
||||
|
||||
/* Parameter definition of the open session command. */
|
||||
struct mux_cmd_open_session {
|
||||
u8 flow_ctrl; /* 0: Flow control disabled (flow allowed). */
|
||||
/* 1: Flow control enabled (flow not allowed)*/
|
||||
u8 ipv4v6_hints; /* 0: IPv4/IPv6 hints not supported.*/
|
||||
/* 1: IPv4/IPv6 hints supported*/
|
||||
__le16 reserved2; /* Reserved. Set to zero. */
|
||||
__le32 dl_head_pad_len; /* Maximum length supported */
|
||||
/* for DL head padding on a datagram. */
|
||||
};
|
||||
|
||||
/* Parameter definition of the open session response. */
|
||||
struct mux_cmd_open_session_resp {
|
||||
__le32 response; /* Response code */
|
||||
u8 flow_ctrl; /* 0: Flow control disabled (flow allowed). */
|
||||
/* 1: Flow control enabled (flow not allowed) */
|
||||
u8 ipv4v6_hints; /* 0: IPv4/IPv6 hints not supported */
|
||||
/* 1: IPv4/IPv6 hints supported */
|
||||
__le16 reserved2; /* Reserved. Set to zero. */
|
||||
__le32 ul_head_pad_len; /* Actual length supported for */
|
||||
/* UL head padding on adatagram.*/
|
||||
};
|
||||
|
||||
/* Parameter definition of the close session response code */
|
||||
struct mux_cmd_close_session_resp {
|
||||
__le32 response;
|
||||
};
|
||||
|
||||
/* Parameter definition of the flow control command. */
|
||||
struct mux_cmd_flow_ctl {
|
||||
__le32 mask; /* indicating the desired flow control */
|
||||
/* state for various flows/queues */
|
||||
};
|
||||
|
||||
/* Parameter definition of the link status report code*/
|
||||
struct mux_cmd_link_status_report {
|
||||
u8 payload;
|
||||
};
|
||||
|
||||
/* Parameter definition of the link status report response code. */
|
||||
struct mux_cmd_link_status_report_resp {
|
||||
__le32 response;
|
||||
};
|
||||
|
||||
/**
|
||||
* union mux_cmd_param - Union-definition of the command parameters.
|
||||
* @open_session: Inband command for open session
|
||||
* @open_session_resp: Inband command for open session response
|
||||
* @close_session_resp: Inband command for close session response
|
||||
* @flow_ctl: In-band flow control on the opened interfaces
|
||||
* @link_status: In-band Link Status Report
|
||||
* @link_status_resp: In-band command for link status report response
|
||||
*/
|
||||
union mux_cmd_param {
|
||||
struct mux_cmd_open_session open_session;
|
||||
struct mux_cmd_open_session_resp open_session_resp;
|
||||
struct mux_cmd_close_session_resp close_session_resp;
|
||||
struct mux_cmd_flow_ctl flow_ctl;
|
||||
struct mux_cmd_link_status_report link_status;
|
||||
struct mux_cmd_link_status_report_resp link_status_resp;
|
||||
};
|
||||
|
||||
/* States of the MUX object.. */
|
||||
enum mux_state {
|
||||
MUX_S_INACTIVE, /* IP MUX is unused. */
|
||||
MUX_S_ACTIVE, /* IP MUX channel is available. */
|
||||
MUX_S_ERROR, /* Defect IP MUX. */
|
||||
};
|
||||
|
||||
/* Supported MUX protocols. */
|
||||
enum ipc_mux_protocol {
|
||||
MUX_UNKNOWN,
|
||||
MUX_LITE,
|
||||
};
|
||||
|
||||
/* Supported UL data transfer methods. */
|
||||
enum ipc_mux_ul_flow {
|
||||
MUX_UL_UNKNOWN,
|
||||
MUX_UL, /* Normal UL data transfer */
|
||||
MUX_UL_ON_CREDITS, /* UL data transfer will be based on credits */
|
||||
};
|
||||
|
||||
/* List of the MUX session. */
|
||||
struct mux_session {
|
||||
struct iosm_wwan *wwan; /*Network i/f used for communication*/
|
||||
int if_id; /* i/f id for session open message.*/
|
||||
u32 flags;
|
||||
u32 ul_head_pad_len; /* Nr of bytes for UL head padding. */
|
||||
u32 dl_head_pad_len; /* Nr of bytes for DL head padding. */
|
||||
struct sk_buff_head ul_list; /* skb entries for an ADT. */
|
||||
u32 flow_ctl_mask; /* UL flow control */
|
||||
u32 flow_ctl_en_cnt; /* Flow control Enable cmd count */
|
||||
u32 flow_ctl_dis_cnt; /* Flow Control Disable cmd count */
|
||||
int ul_flow_credits; /* UL flow credits */
|
||||
u8 net_tx_stop:1,
|
||||
flush:1; /* flush net interface ? */
|
||||
};
|
||||
|
||||
/* State of a single UL data block. */
|
||||
struct mux_adb {
|
||||
struct sk_buff *dest_skb; /* Current UL skb for the data block. */
|
||||
u8 *buf; /* ADB memory. */
|
||||
struct mux_adgh *adgh; /* ADGH pointer */
|
||||
struct sk_buff *qlth_skb; /* QLTH pointer */
|
||||
u32 *next_table_index; /* Pointer to next table index. */
|
||||
struct sk_buff_head free_list; /* List of alloc. ADB for the UL sess.*/
|
||||
int size; /* Size of the ADB memory. */
|
||||
u32 if_cnt; /* Statistic counter */
|
||||
u32 dg_cnt_total;
|
||||
u32 payload_size;
|
||||
};
|
||||
|
||||
/* Temporary ACB state. */
|
||||
struct mux_acb {
|
||||
struct sk_buff *skb; /* Used UL skb. */
|
||||
int if_id; /* Session id. */
|
||||
u32 wanted_response;
|
||||
u32 got_response;
|
||||
u32 cmd;
|
||||
union mux_cmd_param got_param; /* Received command/response parameter */
|
||||
};
|
||||
|
||||
/**
|
||||
* struct iosm_mux - Structure of the data multiplexing over an IP channel.
|
||||
* @dev: Pointer to device structure
|
||||
* @session: Array of the MUX sessions.
|
||||
* @channel: Reference to the IP MUX channel
|
||||
* @pcie: Pointer to iosm_pcie struct
|
||||
* @imem: Pointer to iosm_imem
|
||||
* @wwan: Poinetr to iosm_wwan
|
||||
* @ipc_protocol: Pointer to iosm_protocol
|
||||
* @channel_id: Channel ID for MUX
|
||||
* @protocol: Type of the MUX protocol
|
||||
* @ul_flow: UL Flow type
|
||||
* @nr_sessions: Number of sessions
|
||||
* @instance_id: Instance ID
|
||||
* @state: States of the MUX object
|
||||
* @event: Initiated actions to change the state of the MUX object
|
||||
* @tx_transaction_id: Transaction id for the ACB command.
|
||||
* @rr_next_session: Next session number for round robin.
|
||||
* @ul_adb: State of the UL ADB/ADGH.
|
||||
* @size_needed: Variable to store the size needed during ADB preparation
|
||||
* @ul_data_pend_bytes: Pending UL data to be processed in bytes
|
||||
* @acb: Temporary ACB state
|
||||
* @wwan_q_offset: This will hold the offset of the given instance
|
||||
* Useful while passing or receiving packets from
|
||||
* wwan/imem layer.
|
||||
* @initialized: MUX object is initialized
|
||||
* @ev_mux_net_transmit_pending:
|
||||
* 0 means inform the IPC tasklet to pass the
|
||||
* accumulated uplink ADB to CP.
|
||||
* @adb_prep_ongoing: Flag for ADB preparation status
|
||||
*/
|
||||
struct iosm_mux {
|
||||
struct device *dev;
|
||||
struct mux_session session[IPC_MEM_MUX_IP_SESSION_ENTRIES];
|
||||
struct ipc_mem_channel *channel;
|
||||
struct iosm_pcie *pcie;
|
||||
struct iosm_imem *imem;
|
||||
struct iosm_wwan *wwan;
|
||||
struct iosm_protocol *ipc_protocol;
|
||||
int channel_id;
|
||||
enum ipc_mux_protocol protocol;
|
||||
enum ipc_mux_ul_flow ul_flow;
|
||||
int nr_sessions;
|
||||
int instance_id;
|
||||
enum mux_state state;
|
||||
enum mux_event event;
|
||||
u32 tx_transaction_id;
|
||||
int rr_next_session;
|
||||
struct mux_adb ul_adb;
|
||||
int size_needed;
|
||||
long long ul_data_pend_bytes;
|
||||
struct mux_acb acb;
|
||||
int wwan_q_offset;
|
||||
u8 initialized:1,
|
||||
ev_mux_net_transmit_pending:1,
|
||||
adb_prep_ongoing:1;
|
||||
};
|
||||
|
||||
/* MUX configuration structure */
|
||||
struct ipc_mux_config {
|
||||
enum ipc_mux_protocol protocol;
|
||||
enum ipc_mux_ul_flow ul_flow;
|
||||
int nr_sessions;
|
||||
int instance_id;
|
||||
};
|
||||
|
||||
/**
|
||||
* ipc_mux_init - Allocates and Init MUX instance
|
||||
* @mux_cfg: Pointer to MUX configuration structure
|
||||
* @ipc_imem: Pointer to imem data-struct
|
||||
*
|
||||
* Returns: Initialized mux pointer on success else NULL
|
||||
*/
|
||||
struct iosm_mux *ipc_mux_init(struct ipc_mux_config *mux_cfg,
|
||||
struct iosm_imem *ipc_imem);
|
||||
|
||||
/**
|
||||
* ipc_mux_deinit - Deallocates MUX instance
|
||||
* @ipc_mux: Pointer to the MUX instance.
|
||||
*/
|
||||
void ipc_mux_deinit(struct iosm_mux *ipc_mux);
|
||||
|
||||
/**
|
||||
* ipc_mux_check_n_restart_tx - Checks for pending UL date bytes and then
|
||||
* it restarts the net interface tx queue if
|
||||
* device has set flow control as off.
|
||||
* @ipc_mux: Pointer to MUX data-struct
|
||||
*/
|
||||
void ipc_mux_check_n_restart_tx(struct iosm_mux *ipc_mux);
|
||||
|
||||
/**
|
||||
* ipc_mux_get_active_protocol - Returns the active MUX protocol type.
|
||||
* @ipc_mux: Pointer to MUX data-struct
|
||||
*
|
||||
* Returns: enum of type ipc_mux_protocol
|
||||
*/
|
||||
enum ipc_mux_protocol ipc_mux_get_active_protocol(struct iosm_mux *ipc_mux);
|
||||
|
||||
/**
|
||||
* ipc_mux_open_session - Opens a MUX session for IP traffic.
|
||||
* @ipc_mux: Pointer to MUX data-struct
|
||||
* @session_nr: Interface ID or session number
|
||||
*
|
||||
* Returns: channel id on success, failure value on error
|
||||
*/
|
||||
int ipc_mux_open_session(struct iosm_mux *ipc_mux, int session_nr);
|
||||
|
||||
/**
|
||||
* ipc_mux_close_session - Closes a MUX session.
|
||||
* @ipc_mux: Pointer to MUX data-struct
|
||||
* @session_nr: Interface ID or session number
|
||||
*
|
||||
* Returns: channel id on success, failure value on error
|
||||
*/
|
||||
int ipc_mux_close_session(struct iosm_mux *ipc_mux, int session_nr);
|
||||
|
||||
/**
|
||||
* ipc_mux_get_max_sessions - Retuns the maximum sessions supported on the
|
||||
* provided MUX instance..
|
||||
* @ipc_mux: Pointer to MUX data-struct
|
||||
*
|
||||
* Returns: Number of sessions supported on Success and failure value on error
|
||||
*/
|
||||
int ipc_mux_get_max_sessions(struct iosm_mux *ipc_mux);
|
||||
#endif
|
Loading…
Reference in a new issue