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net: iosm: encode or decode datagram

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1) Encode UL packet into datagram.
2) Decode DL datagram and route it to network layer.
3) Supports credit based flow control.

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:
M Chetan Kumar 2021-06-13 18:20:17 +05:30 committed by David S. Miller
parent 51c45fa954
commit 9413491e20
2 changed files with 1103 additions and 0 deletions
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910
drivers/net/wwan/iosm/iosm_ipc_mux_codec.c Normal file
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2020-21 Intel Corporation.
*/
#include <linux/nospec.h>
#include "iosm_ipc_imem_ops.h"
#include "iosm_ipc_mux_codec.h"
#include "iosm_ipc_task_queue.h"
/* Test the link power state and send a MUX command in blocking mode. */
static int ipc_mux_tq_cmd_send(struct iosm_imem *ipc_imem, int arg, void *msg,
size_t size)
{
struct iosm_mux *ipc_mux = ipc_imem->mux;
const struct mux_acb *acb = msg;
skb_queue_tail(&ipc_mux->channel->ul_list, acb->skb);
ipc_imem_ul_send(ipc_mux->imem);
return 0;
}
static int ipc_mux_acb_send(struct iosm_mux *ipc_mux, bool blocking)
{
struct completion *completion = &ipc_mux->channel->ul_sem;
int ret = ipc_task_queue_send_task(ipc_mux->imem, ipc_mux_tq_cmd_send,
0, &ipc_mux->acb,
sizeof(ipc_mux->acb), false);
if (ret) {
dev_err(ipc_mux->dev, "unable to send mux command");
return ret;
}
/* if blocking, suspend the app and wait for irq in the flash or
* crash phase. return false on timeout to indicate failure.
*/
if (blocking) {
u32 wait_time_milliseconds = IPC_MUX_CMD_RUN_DEFAULT_TIMEOUT;
reinit_completion(completion);
if (wait_for_completion_interruptible_timeout
(completion, msecs_to_jiffies(wait_time_milliseconds)) ==
0) {
dev_err(ipc_mux->dev, "ch[%d] timeout",
ipc_mux->channel_id);
ipc_uevent_send(ipc_mux->imem->dev, UEVENT_MDM_TIMEOUT);
return -ETIMEDOUT;
}
}
return 0;
}
/* Prepare mux Command */
static struct mux_lite_cmdh *ipc_mux_lite_add_cmd(struct iosm_mux *ipc_mux,
u32 cmd, struct mux_acb *acb,
void *param, u32 param_size)
{
struct mux_lite_cmdh *cmdh = (struct mux_lite_cmdh *)acb->skb->data;
cmdh->signature = cpu_to_le32(MUX_SIG_CMDH);
cmdh->command_type = cpu_to_le32(cmd);
cmdh->if_id = acb->if_id;
acb->cmd = cmd;
cmdh->cmd_len = cpu_to_le16(offsetof(struct mux_lite_cmdh, param) +
param_size);
cmdh->transaction_id = cpu_to_le32(ipc_mux->tx_transaction_id++);
if (param)
memcpy(&cmdh->param, param, param_size);
skb_put(acb->skb, le16_to_cpu(cmdh->cmd_len));
return cmdh;
}
static int ipc_mux_acb_alloc(struct iosm_mux *ipc_mux)
{
struct mux_acb *acb = &ipc_mux->acb;
struct sk_buff *skb;
dma_addr_t mapping;
/* Allocate skb memory for the uplink buffer. */
skb = ipc_pcie_alloc_skb(ipc_mux->pcie, MUX_MAX_UL_ACB_BUF_SIZE,
GFP_ATOMIC, &mapping, DMA_TO_DEVICE, 0);
if (!skb)
return -ENOMEM;
/* Save the skb address. */
acb->skb = skb;
memset(skb->data, 0, MUX_MAX_UL_ACB_BUF_SIZE);
return 0;
}
int ipc_mux_dl_acb_send_cmds(struct iosm_mux *ipc_mux, u32 cmd_type, u8 if_id,
u32 transaction_id, union mux_cmd_param *param,
size_t res_size, bool blocking, bool respond)
{
struct mux_acb *acb = &ipc_mux->acb;
struct mux_lite_cmdh *ack_lite;
int ret = 0;
acb->if_id = if_id;
ret = ipc_mux_acb_alloc(ipc_mux);
if (ret)
return ret;
ack_lite = ipc_mux_lite_add_cmd(ipc_mux, cmd_type, acb, param,
res_size);
if (respond)
ack_lite->transaction_id = cpu_to_le32(transaction_id);
ret = ipc_mux_acb_send(ipc_mux, blocking);
return ret;
}
void ipc_mux_netif_tx_flowctrl(struct mux_session *session, int idx, bool on)
{
/* Inform the network interface to start/stop flow ctrl */
ipc_wwan_tx_flowctrl(session->wwan, idx, on);
}
static int ipc_mux_dl_cmdresps_decode_process(struct iosm_mux *ipc_mux,
struct mux_lite_cmdh *cmdh)
{
struct mux_acb *acb = &ipc_mux->acb;
switch (le32_to_cpu(cmdh->command_type)) {
case MUX_CMD_OPEN_SESSION_RESP:
case MUX_CMD_CLOSE_SESSION_RESP:
/* Resume the control application. */
acb->got_param = cmdh->param;
break;
case MUX_LITE_CMD_FLOW_CTL_ACK:
/* This command type is not expected as response for
* Aggregation version of the protocol. So return non-zero.
*/
if (ipc_mux->protocol != MUX_LITE)
return -EINVAL;
dev_dbg(ipc_mux->dev, "if %u FLOW_CTL_ACK %u received",
cmdh->if_id, le32_to_cpu(cmdh->transaction_id));
break;
default:
return -EINVAL;
}
acb->wanted_response = MUX_CMD_INVALID;
acb->got_response = le32_to_cpu(cmdh->command_type);
complete(&ipc_mux->channel->ul_sem);
return 0;
}
static int ipc_mux_dl_dlcmds_decode_process(struct iosm_mux *ipc_mux,
struct mux_lite_cmdh *cmdh)
{
union mux_cmd_param *param = &cmdh->param;
struct mux_session *session;
int new_size;
dev_dbg(ipc_mux->dev, "if_id[%d]: dlcmds decode process %d",
cmdh->if_id, le32_to_cpu(cmdh->command_type));
switch (le32_to_cpu(cmdh->command_type)) {
case MUX_LITE_CMD_FLOW_CTL:
if (cmdh->if_id >= ipc_mux->nr_sessions) {
dev_err(ipc_mux->dev, "if_id [%d] not valid",
cmdh->if_id);
return -EINVAL; /* No session interface id. */
}
session = &ipc_mux->session[cmdh->if_id];
new_size = offsetof(struct mux_lite_cmdh, param) +
sizeof(param->flow_ctl);
if (param->flow_ctl.mask == cpu_to_le32(0xFFFFFFFF)) {
/* Backward Compatibility */
if (cmdh->cmd_len == cpu_to_le16(new_size))
session->flow_ctl_mask =
le32_to_cpu(param->flow_ctl.mask);
else
session->flow_ctl_mask = ~0;
/* if CP asks for FLOW CTRL Enable
* then set our internal flow control Tx flag
* to limit uplink session queueing
*/
session->net_tx_stop = true;
/* Update the stats */
session->flow_ctl_en_cnt++;
} else if (param->flow_ctl.mask == 0) {
/* Just reset the Flow control mask and let
* mux_flow_ctrl_low_thre_b take control on
* our internal Tx flag and enabling kernel
* flow control
*/
/* Backward Compatibility */
if (cmdh->cmd_len == cpu_to_le16(new_size))
session->flow_ctl_mask =
le32_to_cpu(param->flow_ctl.mask);
else
session->flow_ctl_mask = 0;
/* Update the stats */
session->flow_ctl_dis_cnt++;
} else {
break;
}
dev_dbg(ipc_mux->dev, "if[%u] FLOW CTRL 0x%08X", cmdh->if_id,
le32_to_cpu(param->flow_ctl.mask));
break;
case MUX_LITE_CMD_LINK_STATUS_REPORT:
break;
default:
return -EINVAL;
}
return 0;
}
/* Decode and Send appropriate response to a command block. */
static void ipc_mux_dl_cmd_decode(struct iosm_mux *ipc_mux, struct sk_buff *skb)
{
struct mux_lite_cmdh *cmdh = (struct mux_lite_cmdh *)skb->data;
__le32 trans_id = cmdh->transaction_id;
if (ipc_mux_dl_cmdresps_decode_process(ipc_mux, cmdh)) {
/* Unable to decode command response indicates the cmd_type
* may be a command instead of response. So try to decoding it.
*/
if (!ipc_mux_dl_dlcmds_decode_process(ipc_mux, cmdh)) {
/* Decoded command may need a response. Give the
* response according to the command type.
*/
union mux_cmd_param *mux_cmd = NULL;
size_t size = 0;
u32 cmd = MUX_LITE_CMD_LINK_STATUS_REPORT_RESP;
if (cmdh->command_type ==
cpu_to_le32(MUX_LITE_CMD_LINK_STATUS_REPORT)) {
mux_cmd = &cmdh->param;
mux_cmd->link_status_resp.response =
cpu_to_le32(MUX_CMD_RESP_SUCCESS);
/* response field is u32 */
size = sizeof(u32);
} else if (cmdh->command_type ==
cpu_to_le32(MUX_LITE_CMD_FLOW_CTL)) {
cmd = MUX_LITE_CMD_FLOW_CTL_ACK;
} else {
return;
}
if (ipc_mux_dl_acb_send_cmds(ipc_mux, cmd, cmdh->if_id,
le32_to_cpu(trans_id),
mux_cmd, size, false,
true))
dev_err(ipc_mux->dev,
"if_id %d: cmd send failed",
cmdh->if_id);
}
}
}
/* Pass the DL packet to the netif layer. */
static int ipc_mux_net_receive(struct iosm_mux *ipc_mux, int if_id,
struct iosm_wwan *wwan, u32 offset,
u8 service_class, struct sk_buff *skb)
{
struct sk_buff *dest_skb = skb_clone(skb, GFP_ATOMIC);
if (!dest_skb)
return -ENOMEM;
skb_pull(dest_skb, offset);
skb_set_tail_pointer(dest_skb, dest_skb->len);
/* Pass the packet to the netif layer. */
dest_skb->priority = service_class;
return ipc_wwan_receive(wwan, dest_skb, false, if_id + 1);
}
/* Decode Flow Credit Table in the block */
static void ipc_mux_dl_fcth_decode(struct iosm_mux *ipc_mux,
unsigned char *block)
{
struct ipc_mem_lite_gen_tbl *fct = (struct ipc_mem_lite_gen_tbl *)block;
struct iosm_wwan *wwan;
int ul_credits;
int if_id;
if (fct->vfl_length != sizeof(fct->vfl.nr_of_bytes)) {
dev_err(ipc_mux->dev, "unexpected FCT length: %d",
fct->vfl_length);
return;
}
if_id = fct->if_id;
if (if_id >= ipc_mux->nr_sessions) {
dev_err(ipc_mux->dev, "not supported if_id: %d", if_id);
return;
}
/* Is the session active ? */
if_id = array_index_nospec(if_id, ipc_mux->nr_sessions);
wwan = ipc_mux->session[if_id].wwan;
if (!wwan) {
dev_err(ipc_mux->dev, "session Net ID is NULL");
return;
}
ul_credits = fct->vfl.nr_of_bytes;
dev_dbg(ipc_mux->dev, "Flow_Credit:: if_id[%d] Old: %d Grants: %d",
if_id, ipc_mux->session[if_id].ul_flow_credits, ul_credits);
/* Update the Flow Credit information from ADB */
ipc_mux->session[if_id].ul_flow_credits += ul_credits;
/* Check whether the TX can be started */
if (ipc_mux->session[if_id].ul_flow_credits > 0) {
ipc_mux->session[if_id].net_tx_stop = false;
ipc_mux_netif_tx_flowctrl(&ipc_mux->session[if_id],
ipc_mux->session[if_id].if_id, false);
}
}
/* Decode non-aggregated datagram */
static void ipc_mux_dl_adgh_decode(struct iosm_mux *ipc_mux,
struct sk_buff *skb)
{
u32 pad_len, packet_offset;
struct iosm_wwan *wwan;
struct mux_adgh *adgh;
u8 *block = skb->data;
int rc = 0;
u8 if_id;
adgh = (struct mux_adgh *)block;
if (adgh->signature != cpu_to_le32(MUX_SIG_ADGH)) {
dev_err(ipc_mux->dev, "invalid ADGH signature received");
return;
}
if_id = adgh->if_id;
if (if_id >= ipc_mux->nr_sessions) {
dev_err(ipc_mux->dev, "invalid if_id while decoding %d", if_id);
return;
}
/* Is the session active ? */
if_id = array_index_nospec(if_id, ipc_mux->nr_sessions);
wwan = ipc_mux->session[if_id].wwan;
if (!wwan) {
dev_err(ipc_mux->dev, "session Net ID is NULL");
return;
}
/* Store the pad len for the corresponding session
* Pad bytes as negotiated in the open session less the header size
* (see session management chapter for details).
* If resulting padding is zero or less, the additional head padding is
* omitted. For e.g., if HEAD_PAD_LEN = 16 or less, this field is
* omitted if HEAD_PAD_LEN = 20, then this field will have 4 bytes
* set to zero
*/
pad_len =
ipc_mux->session[if_id].dl_head_pad_len - IPC_MEM_DL_ETH_OFFSET;
packet_offset = sizeof(*adgh) + pad_len;
if_id += ipc_mux->wwan_q_offset;
/* Pass the packet to the netif layer */
rc = ipc_mux_net_receive(ipc_mux, if_id, wwan, packet_offset,
adgh->service_class, skb);
if (rc) {
dev_err(ipc_mux->dev, "mux adgh decoding error");
return;
}
ipc_mux->session[if_id].flush = 1;
}
void ipc_mux_dl_decode(struct iosm_mux *ipc_mux, struct sk_buff *skb)
{
u32 signature;
if (!skb->data)
return;
/* Decode the MUX header type. */
signature = le32_to_cpup((__le32 *)skb->data);
switch (signature) {
case MUX_SIG_ADGH:
ipc_mux_dl_adgh_decode(ipc_mux, skb);
break;
case MUX_SIG_FCTH:
ipc_mux_dl_fcth_decode(ipc_mux, skb->data);
break;
case MUX_SIG_CMDH:
ipc_mux_dl_cmd_decode(ipc_mux, skb);
break;
default:
dev_err(ipc_mux->dev, "invalid ABH signature");
}
ipc_pcie_kfree_skb(ipc_mux->pcie, skb);
}
static int ipc_mux_ul_skb_alloc(struct iosm_mux *ipc_mux,
struct mux_adb *ul_adb, u32 type)
{
/* Take the first element of the free list. */
struct sk_buff *skb = skb_dequeue(&ul_adb->free_list);
int qlt_size;
if (!skb)
return -EBUSY; /* Wait for a free ADB skb. */
/* Mark it as UL ADB to select the right free operation. */
IPC_CB(skb)->op_type = (u8)UL_MUX_OP_ADB;
switch (type) {
case MUX_SIG_ADGH:
/* Save the ADB memory settings. */
ul_adb->dest_skb = skb;
ul_adb->buf = skb->data;
ul_adb->size = IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE;
/* reset statistic counter */
ul_adb->if_cnt = 0;
ul_adb->payload_size = 0;
ul_adb->dg_cnt_total = 0;
ul_adb->adgh = (struct mux_adgh *)skb->data;
memset(ul_adb->adgh, 0, sizeof(struct mux_adgh));
break;
case MUX_SIG_QLTH:
qlt_size = offsetof(struct ipc_mem_lite_gen_tbl, vfl) +
(MUX_QUEUE_LEVEL * sizeof(struct mux_lite_vfl));
if (qlt_size > IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE) {
dev_err(ipc_mux->dev,
"can't support. QLT size:%d SKB size: %d",
qlt_size, IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE);
return -ERANGE;
}
ul_adb->qlth_skb = skb;
memset((ul_adb->qlth_skb)->data, 0, qlt_size);
skb_put(skb, qlt_size);
break;
}
return 0;
}
static void ipc_mux_ul_adgh_finish(struct iosm_mux *ipc_mux)
{
struct mux_adb *ul_adb = &ipc_mux->ul_adb;
u16 adgh_len;
long long bytes;
char *str;
if (!ul_adb || !ul_adb->dest_skb) {
dev_err(ipc_mux->dev, "no dest skb");
return;
}
adgh_len = le16_to_cpu(ul_adb->adgh->length);
skb_put(ul_adb->dest_skb, adgh_len);
skb_queue_tail(&ipc_mux->channel->ul_list, ul_adb->dest_skb);
ul_adb->dest_skb = NULL;
if (ipc_mux->ul_flow == MUX_UL_ON_CREDITS) {
struct mux_session *session;
session = &ipc_mux->session[ul_adb->adgh->if_id];
str = "available_credits";
bytes = (long long)session->ul_flow_credits;
} else {
str = "pend_bytes";
bytes = ipc_mux->ul_data_pend_bytes;
ipc_mux->ul_data_pend_bytes = ipc_mux->ul_data_pend_bytes +
adgh_len;
}
dev_dbg(ipc_mux->dev, "UL ADGH: size=%u, if_id=%d, payload=%d, %s=%lld",
adgh_len, ul_adb->adgh->if_id, ul_adb->payload_size,
str, bytes);
}
/* Allocates an ADB from the free list and initializes it with ADBH */
static bool ipc_mux_ul_adb_allocate(struct iosm_mux *ipc_mux,
struct mux_adb *adb, int *size_needed,
u32 type)
{
bool ret_val = false;
int status;
if (!adb->dest_skb) {
/* Allocate memory for the ADB including of the
* datagram table header.
*/
status = ipc_mux_ul_skb_alloc(ipc_mux, adb, type);
if (status)
/* Is a pending ADB available ? */
ret_val = true; /* None. */
/* Update size need to zero only for new ADB memory */
*size_needed = 0;
}
return ret_val;
}
/* Informs the network stack to stop sending further packets for all opened
* sessions
*/
static void ipc_mux_stop_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;
session->net_tx_stop = true;
}
}
/* Sends Queue Level Table of all opened sessions */
static bool ipc_mux_lite_send_qlt(struct iosm_mux *ipc_mux)
{
struct ipc_mem_lite_gen_tbl *qlt;
struct mux_session *session;
bool qlt_updated = false;
int i;
int qlt_size;
if (!ipc_mux->initialized || ipc_mux->state != MUX_S_ACTIVE)
return qlt_updated;
qlt_size = offsetof(struct ipc_mem_lite_gen_tbl, vfl) +
MUX_QUEUE_LEVEL * sizeof(struct mux_lite_vfl);
for (i = 0; i < ipc_mux->nr_sessions; i++) {
session = &ipc_mux->session[i];
if (!session->wwan || session->flow_ctl_mask)
continue;
if (ipc_mux_ul_skb_alloc(ipc_mux, &ipc_mux->ul_adb,
MUX_SIG_QLTH)) {
dev_err(ipc_mux->dev,
"no reserved mem to send QLT of if_id: %d", i);
break;
}
/* Prepare QLT */
qlt = (struct ipc_mem_lite_gen_tbl *)(ipc_mux->ul_adb.qlth_skb)
->data;
qlt->signature = cpu_to_le32(MUX_SIG_QLTH);
qlt->length = cpu_to_le16(qlt_size);
qlt->if_id = i;
qlt->vfl_length = MUX_QUEUE_LEVEL * sizeof(struct mux_lite_vfl);
qlt->reserved[0] = 0;
qlt->reserved[1] = 0;
qlt->vfl.nr_of_bytes = session->ul_list.qlen;
/* Add QLT to the transfer list. */
skb_queue_tail(&ipc_mux->channel->ul_list,
ipc_mux->ul_adb.qlth_skb);
qlt_updated = true;
ipc_mux->ul_adb.qlth_skb = NULL;
}
if (qlt_updated)
/* Updates the TDs with ul_list */
(void)ipc_imem_ul_write_td(ipc_mux->imem);
return qlt_updated;
}
/* Checks the available credits for the specified session and returns
* number of packets for which credits are available.
*/
static int ipc_mux_ul_bytes_credits_check(struct iosm_mux *ipc_mux,
struct mux_session *session,
struct sk_buff_head *ul_list,
int max_nr_of_pkts)
{
int pkts_to_send = 0;
struct sk_buff *skb;
int credits = 0;
if (ipc_mux->ul_flow == MUX_UL_ON_CREDITS) {
credits = session->ul_flow_credits;
if (credits <= 0) {
dev_dbg(ipc_mux->dev,
"FC::if_id[%d] Insuff.Credits/Qlen:%d/%u",
session->if_id, session->ul_flow_credits,
session->ul_list.qlen); /* nr_of_bytes */
return 0;
}
} else {
credits = IPC_MEM_MUX_UL_FLOWCTRL_HIGH_B -
ipc_mux->ul_data_pend_bytes;
if (credits <= 0) {
ipc_mux_stop_tx_for_all_sessions(ipc_mux);
dev_dbg(ipc_mux->dev,
"if_id[%d] encod. fail Bytes: %llu, thresh: %d",
session->if_id, ipc_mux->ul_data_pend_bytes,
IPC_MEM_MUX_UL_FLOWCTRL_HIGH_B);
return 0;
}
}
/* Check if there are enough credits/bytes available to send the
* requested max_nr_of_pkts. Otherwise restrict the nr_of_pkts
* depending on available credits.
*/
skb_queue_walk(ul_list, skb)
{
if (!(credits >= skb->len && pkts_to_send < max_nr_of_pkts))
break;
credits -= skb->len;
pkts_to_send++;
}
return pkts_to_send;
}
/* Encode the UL IP packet according to Lite spec. */
static int ipc_mux_ul_adgh_encode(struct iosm_mux *ipc_mux, int session_id,
struct mux_session *session,
struct sk_buff_head *ul_list,
struct mux_adb *adb, int nr_of_pkts)
{
int offset = sizeof(struct mux_adgh);
int adb_updated = -EINVAL;
struct sk_buff *src_skb;
int aligned_size = 0;
int nr_of_skb = 0;
u32 pad_len = 0;
/* Re-calculate the number of packets depending on number of bytes to be
* processed/available credits.
*/
nr_of_pkts = ipc_mux_ul_bytes_credits_check(ipc_mux, session, ul_list,
nr_of_pkts);
/* If calculated nr_of_pkts from available credits is <= 0
* then nothing to do.
*/
if (nr_of_pkts <= 0)
return 0;
/* Read configured UL head_pad_length for session.*/
if (session->ul_head_pad_len > IPC_MEM_DL_ETH_OFFSET)
pad_len = session->ul_head_pad_len - IPC_MEM_DL_ETH_OFFSET;
/* Process all pending UL packets for this session
* depending on the allocated datagram table size.
*/
while (nr_of_pkts > 0) {
/* get destination skb allocated */
if (ipc_mux_ul_adb_allocate(ipc_mux, adb, &ipc_mux->size_needed,
MUX_SIG_ADGH)) {
dev_err(ipc_mux->dev, "no reserved memory for ADGH");
return -ENOMEM;
}
/* Peek at the head of the list. */
src_skb = skb_peek(ul_list);
if (!src_skb) {
dev_err(ipc_mux->dev,
"skb peek return NULL with count : %d",
nr_of_pkts);
break;
}
/* Calculate the memory value. */
aligned_size = ALIGN((pad_len + src_skb->len), 4);
ipc_mux->size_needed = sizeof(struct mux_adgh) + aligned_size;
if (ipc_mux->size_needed > adb->size) {
dev_dbg(ipc_mux->dev, "size needed %d, adgh size %d",
ipc_mux->size_needed, adb->size);
/* Return 1 if any IP packet is added to the transfer
* list.
*/
return nr_of_skb ? 1 : 0;
}
/* Add buffer (without head padding to next pending transfer) */
memcpy(adb->buf + offset + pad_len, src_skb->data,
src_skb->len);
adb->adgh->signature = cpu_to_le32(MUX_SIG_ADGH);
adb->adgh->if_id = session_id;
adb->adgh->length =
cpu_to_le16(sizeof(struct mux_adgh) + pad_len +
src_skb->len);
adb->adgh->service_class = src_skb->priority;
adb->adgh->next_count = --nr_of_pkts;
adb->dg_cnt_total++;
adb->payload_size += src_skb->len;
if (ipc_mux->ul_flow == MUX_UL_ON_CREDITS)
/* Decrement the credit value as we are processing the
* datagram from the UL list.
*/
session->ul_flow_credits -= src_skb->len;
/* Remove the processed elements and free it. */
src_skb = skb_dequeue(ul_list);
dev_kfree_skb(src_skb);
nr_of_skb++;
ipc_mux_ul_adgh_finish(ipc_mux);
}
if (nr_of_skb) {
/* Send QLT info to modem if pending bytes > high watermark
* in case of mux lite
*/
if (ipc_mux->ul_flow == MUX_UL_ON_CREDITS ||
ipc_mux->ul_data_pend_bytes >=
IPC_MEM_MUX_UL_FLOWCTRL_LOW_B)
adb_updated = ipc_mux_lite_send_qlt(ipc_mux);
else
adb_updated = 1;
/* Updates the TDs with ul_list */
(void)ipc_imem_ul_write_td(ipc_mux->imem);
}
return adb_updated;
}
bool ipc_mux_ul_data_encode(struct iosm_mux *ipc_mux)
{
struct sk_buff_head *ul_list;
struct mux_session *session;
int updated = 0;
int session_id;
int dg_n;
int i;
if (!ipc_mux || ipc_mux->state != MUX_S_ACTIVE ||
ipc_mux->adb_prep_ongoing)
return false;
ipc_mux->adb_prep_ongoing = true;
for (i = 0; i < ipc_mux->nr_sessions; i++) {
session_id = ipc_mux->rr_next_session;
session = &ipc_mux->session[session_id];
/* Go to next handle rr_next_session overflow */
ipc_mux->rr_next_session++;
if (ipc_mux->rr_next_session >= ipc_mux->nr_sessions)
ipc_mux->rr_next_session = 0;
if (!session->wwan || session->flow_ctl_mask ||
session->net_tx_stop)
continue;
ul_list = &session->ul_list;
/* Is something pending in UL and flow ctrl off */
dg_n = skb_queue_len(ul_list);
if (dg_n > MUX_MAX_UL_DG_ENTRIES)
dg_n = MUX_MAX_UL_DG_ENTRIES;
if (dg_n == 0)
/* Nothing to do for ipc_mux session
* -> try next session id.
*/
continue;
updated = ipc_mux_ul_adgh_encode(ipc_mux, session_id, session,
ul_list, &ipc_mux->ul_adb,
dg_n);
}
ipc_mux->adb_prep_ongoing = false;
return updated == 1;
}
void ipc_mux_ul_encoded_process(struct iosm_mux *ipc_mux, struct sk_buff *skb)
{
struct mux_adgh *adgh;
u16 adgh_len;
adgh = (struct mux_adgh *)skb->data;
adgh_len = le16_to_cpu(adgh->length);
if (adgh->signature == cpu_to_le32(MUX_SIG_ADGH) &&
ipc_mux->ul_flow == MUX_UL)
ipc_mux->ul_data_pend_bytes = ipc_mux->ul_data_pend_bytes -
adgh_len;
if (ipc_mux->ul_flow == MUX_UL)
dev_dbg(ipc_mux->dev, "ul_data_pend_bytes: %lld",
ipc_mux->ul_data_pend_bytes);
/* Reset the skb settings. */
skb->tail = 0;
skb->len = 0;
/* Add the consumed ADB to the free list. */
skb_queue_tail((&ipc_mux->ul_adb.free_list), skb);
}
/* Start the NETIF uplink send transfer in MUX mode. */
static int ipc_mux_tq_ul_trigger_encode(struct iosm_imem *ipc_imem, int arg,
void *msg, size_t size)
{
struct iosm_mux *ipc_mux = ipc_imem->mux;
bool ul_data_pend = false;
/* Add session UL data to a ADB and ADGH */
ul_data_pend = ipc_mux_ul_data_encode(ipc_mux);
if (ul_data_pend)
/* Delay the doorbell irq */
ipc_imem_td_update_timer_start(ipc_mux->imem);
/* reset the debounce flag */
ipc_mux->ev_mux_net_transmit_pending = false;
return 0;
}
int ipc_mux_ul_trigger_encode(struct iosm_mux *ipc_mux, int if_id,
struct sk_buff *skb)
{
struct mux_session *session = &ipc_mux->session[if_id];
int ret = -EINVAL;
if (ipc_mux->channel &&
ipc_mux->channel->state != IMEM_CHANNEL_ACTIVE) {
dev_err(ipc_mux->dev,
"channel state is not IMEM_CHANNEL_ACTIVE");
goto out;
}
if (!session->wwan) {
dev_err(ipc_mux->dev, "session net ID is NULL");
ret = -EFAULT;
goto out;
}
/* Session is under flow control.
* Check if packet can be queued in session list, if not
* suspend net tx
*/
if (skb_queue_len(&session->ul_list) >=
(session->net_tx_stop ?
IPC_MEM_MUX_UL_SESS_FCON_THRESHOLD :
(IPC_MEM_MUX_UL_SESS_FCON_THRESHOLD *
IPC_MEM_MUX_UL_SESS_FCOFF_THRESHOLD_FACTOR))) {
ipc_mux_netif_tx_flowctrl(session, session->if_id, true);
ret = -EBUSY;
goto out;
}
/* Add skb to the uplink skb accumulator. */
skb_queue_tail(&session->ul_list, skb);
/* Inform the IPC kthread to pass uplink IP packets to CP. */
if (!ipc_mux->ev_mux_net_transmit_pending) {
ipc_mux->ev_mux_net_transmit_pending = true;
ret = ipc_task_queue_send_task(ipc_mux->imem,
ipc_mux_tq_ul_trigger_encode, 0,
NULL, 0, false);
if (ret)
goto out;
}
dev_dbg(ipc_mux->dev, "mux ul if[%d] qlen=%d/%u, len=%d/%d, prio=%d",
if_id, skb_queue_len(&session->ul_list), session->ul_list.qlen,
skb->len, skb->truesize, skb->priority);
ret = 0;
out:
return ret;
}

193
drivers/net/wwan/iosm/iosm_ipc_mux_codec.h Normal file
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@ -0,0 +1,193 @@
/* SPDX-License-Identifier: GPL-2.0-only
*
* Copyright (C) 2020-21 Intel Corporation.
*/
#ifndef IOSM_IPC_MUX_CODEC_H
#define IOSM_IPC_MUX_CODEC_H
#include "iosm_ipc_mux.h"
/* Queue level size and reporting
* >1 is enable, 0 is disable
*/
#define MUX_QUEUE_LEVEL 1
/* Size of the buffer for the IP MUX commands. */
#define MUX_MAX_UL_ACB_BUF_SIZE 256
/* Maximum number of packets in a go per session */
#define MUX_MAX_UL_DG_ENTRIES 100
/* ADGH: Signature of the Datagram Header. */
#define MUX_SIG_ADGH 0x48474441
/* CMDH: Signature of the Command Header. */
#define MUX_SIG_CMDH 0x48444D43
/* QLTH: Signature of the Queue Level Table */
#define MUX_SIG_QLTH 0x48544C51
/* FCTH: Signature of the Flow Credit Table */
#define MUX_SIG_FCTH 0x48544346
/* MUX UL session threshold factor */
#define IPC_MEM_MUX_UL_SESS_FCOFF_THRESHOLD_FACTOR (4)
/* Size of the buffer for the IP MUX Lite data buffer. */
#define IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE (2 * 1024)
/* MUX UL session threshold in number of packets */
#define IPC_MEM_MUX_UL_SESS_FCON_THRESHOLD (64)
/* Default time out for sending IPC session commands like
* open session, close session etc
* unit : milliseconds
*/
#define IPC_MUX_CMD_RUN_DEFAULT_TIMEOUT 1000 /* 1 second */
/* MUX UL flow control lower threshold in bytes */
#define IPC_MEM_MUX_UL_FLOWCTRL_LOW_B 10240 /* 10KB */
/* MUX UL flow control higher threshold in bytes (5ms worth of data)*/
#define IPC_MEM_MUX_UL_FLOWCTRL_HIGH_B (110 * 1024)
/**
* struct mux_adgh - Aggregated Datagram Header.
* @signature: Signature of the Aggregated Datagram Header(0x48474441)
* @length: Length (in bytes) of the datagram header. This length
* shall include the header size. Min value: 0x10
* @if_id: ID of the interface the datagrams belong to
* @opt_ipv4v6: Indicates IPv4(=0)/IPv6(=1), It is optional if not
* used set it to zero.
* @reserved: Reserved bits. Set to zero.
* @service_class: Service class identifier for the datagram.
* @next_count: Count of the datagrams that shall be following this
* datagrams for this interface. A count of zero means
* the next datagram may not belong to this interface.
* @reserved1: Reserved bytes, Set to zero
*/
struct mux_adgh {
__le32 signature;
__le16 length;
u8 if_id;
u8 opt_ipv4v6;
u8 service_class;
u8 next_count;
u8 reserved1[6];
};
/**
* struct mux_lite_cmdh - MUX Lite Command Header
* @signature: Signature of the Command Header(0x48444D43)
* @cmd_len: Length (in bytes) of the command. This length shall
* include the header size. Minimum value: 0x10
* @if_id: ID of the interface the commands in the table belong to.
* @reserved: Reserved Set to zero.
* @command_type: Command Enum.
* @transaction_id: 4 byte value shall be generated and sent along with a
* command Responses and ACKs shall have the same
* Transaction ID as their commands. It shall be unique to
* the command transaction on the given interface.
* @param: Optional parameters used with the command.
*/
struct mux_lite_cmdh {
__le32 signature;
__le16 cmd_len;
u8 if_id;
u8 reserved;
__le32 command_type;
__le32 transaction_id;
union mux_cmd_param param;
};
/**
* struct mux_lite_vfl - value field in generic table
* @nr_of_bytes: Number of bytes available to transmit in the queue.
*/
struct mux_lite_vfl {
u32 nr_of_bytes;
};
/**
* struct ipc_mem_lite_gen_tbl - Generic table format for Queue Level
* and Flow Credit
* @signature: Signature of the table
* @length: Length of the table
* @if_id: ID of the interface the table belongs to
* @vfl_length: Value field length
* @reserved: Reserved
* @vfl: Value field of variable length
*/
struct ipc_mem_lite_gen_tbl {
__le32 signature;
__le16 length;
u8 if_id;
u8 vfl_length;
u32 reserved[2];
struct mux_lite_vfl vfl;
};
/**
* ipc_mux_dl_decode -Route the DL packet through the IP MUX layer
* depending on Header.
* @ipc_mux: Pointer to MUX data-struct
* @skb: Pointer to ipc_skb.
*/
void ipc_mux_dl_decode(struct iosm_mux *ipc_mux, struct sk_buff *skb);
/**
* ipc_mux_dl_acb_send_cmds - Respond to the Command blocks.
* @ipc_mux: Pointer to MUX data-struct
* @cmd_type: Command
* @if_id: Session interface id.
* @transaction_id: Command transaction id.
* @param: Pointer to command params.
* @res_size: Response size
* @blocking: True for blocking send
* @respond: If true return transaction ID
*
* Returns: 0 in success and failure value on error
*/
int ipc_mux_dl_acb_send_cmds(struct iosm_mux *ipc_mux, u32 cmd_type, u8 if_id,
u32 transaction_id, union mux_cmd_param *param,
size_t res_size, bool blocking, bool respond);
/**
* ipc_mux_netif_tx_flowctrl - Enable/Disable TX flow control on MUX sessions.
* @session: Pointer to mux_session struct
* @idx: Session ID
* @on: true for Enable and false for disable flow control
*/
void ipc_mux_netif_tx_flowctrl(struct mux_session *session, int idx, bool on);
/**
* ipc_mux_ul_trigger_encode - Route the UL packet through the IP MUX layer
* for encoding.
* @ipc_mux: Pointer to MUX data-struct
* @if_id: Session ID.
* @skb: Pointer to ipc_skb.
*
* Returns: 0 if successfully encoded
* failure value on error
* -EBUSY if packet has to be retransmitted.
*/
int ipc_mux_ul_trigger_encode(struct iosm_mux *ipc_mux, int if_id,
struct sk_buff *skb);
/**
* ipc_mux_ul_data_encode - UL encode function for calling from Tasklet context.
* @ipc_mux: Pointer to MUX data-struct
*
* Returns: TRUE if any packet of any session is encoded FALSE otherwise.
*/
bool ipc_mux_ul_data_encode(struct iosm_mux *ipc_mux);
/**
* ipc_mux_ul_encoded_process - Handles the Modem processed UL data by adding
* the SKB to the UL free list.
* @ipc_mux: Pointer to MUX data-struct
* @skb: Pointer to ipc_skb.
*/
void ipc_mux_ul_encoded_process(struct iosm_mux *ipc_mux, struct sk_buff *skb);
#endif