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M7350/kernel/drivers/net/ethernet/msm/rndis_ipa.c

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M7350v5_en_gpl
2024-09-09 08:57:42 +00:00
/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/atomic.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/debugfs.h>
#include <linux/in.h>
#include <linux/stddef.h>
#include <linux/ip.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/msm_ipa.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/sched.h>
#include <linux/ipa.h>
#include <linux/random.h>
#include <linux/rndis_ipa.h>
#include <linux/workqueue.h>
#define CREATE_TRACE_POINTS
#include "rndis_ipa_trace.h"
#define DRV_NAME "RNDIS_IPA"
#define DEBUGFS_DIR_NAME "rndis_ipa"
#define DEBUGFS_AGGR_DIR_NAME "rndis_ipa_aggregation"
#define NETDEV_NAME "rndis"
#define DRV_RESOURCE_ID IPA_RM_RESOURCE_RNDIS_PROD
#define IPV4_HDR_NAME "rndis_eth_ipv4"
#define IPV6_HDR_NAME "rndis_eth_ipv6"
#define IPA_TO_USB_CLIENT IPA_CLIENT_USB_CONS
#define INACTIVITY_MSEC_DELAY 100
#define DEFAULT_OUTSTANDING_HIGH 64
#define DEFAULT_OUTSTANDING_LOW 32
#define DEBUGFS_TEMP_BUF_SIZE 4
#define RNDIS_IPA_PKT_TYPE 0x00000001
#define RNDIS_IPA_DFLT_RT_HDL 0
#define FROM_IPA_TO_USB_BAMDMA 4
#define FROM_USB_TO_IPA_BAMDMA 5
#define BAM_DMA_MAX_PKT_NUMBER 10
#define BAM_DMA_DATA_FIFO_SIZE \
(BAM_DMA_MAX_PKT_NUMBER* \
(ETH_FRAME_LEN + sizeof(struct rndis_pkt_hdr)))
#define BAM_DMA_DESC_FIFO_SIZE \
(BAM_DMA_MAX_PKT_NUMBER*(sizeof(struct sps_iovec)))
#define TX_TIMEOUT (5 * HZ)
#define MIN_TX_ERROR_SLEEP_PERIOD 500
#define DEFAULT_AGGR_TIME_LIMIT 1
#define DEFAULT_AGGR_PKT_LIMIT 0
#define RNDIS_IPA_ERROR(fmt, args...) \
pr_err(DRV_NAME "@%s@%d@ctx:%s: "\
fmt, __func__, __LINE__, current->comm, ## args)
#define RNDIS_IPA_DEBUG(fmt, args...) \
pr_debug("ctx: %s, "fmt, current->comm, ## args)
#define NULL_CHECK_RETVAL(ptr) \
do { \
if (!(ptr)) { \
RNDIS_IPA_ERROR("null pointer #ptr\n"); \
return -EINVAL; \
} \
} \
while (0)
#define NULL_CHECK_NO_RETVAL(ptr) \
do { \
if (!(ptr)) {\
RNDIS_IPA_ERROR("null pointer #ptr\n"); \
return; \
} \
} \
while (0)
#define RNDIS_HDR_OFST(field) offsetof(struct rndis_pkt_hdr, field)
#define RNDIS_IPA_LOG_ENTRY() RNDIS_IPA_DEBUG("begin\n")
#define RNDIS_IPA_LOG_EXIT() RNDIS_IPA_DEBUG("end\n")
/**
* enum rndis_ipa_state - specify the current driver internal state
* which is guarded by a state machine.
*
* The driver internal state changes due to its external API usage.
* The driver saves its internal state to guard from caller illegal
* call sequence.
* states:
* UNLOADED is the first state which is the default one and is also the state
* after the driver gets unloaded(cleanup).
* INITIALIZED is the driver state once it finished registering
* the network device and all internal data struct were initialized
* CONNECTED is the driver state once the USB pipes were connected to IPA
* UP is the driver state after the interface mode was set to UP but the
* pipes are not connected yet - this state is meta-stable state.
* CONNECTED_AND_UP is the driver state when the pipe were connected and
* the interface got UP request from the network stack. this is the driver
* idle operation state which allows it to transmit/receive data.
* INVALID is a state which is not allowed.
*/
enum rndis_ipa_state {
RNDIS_IPA_UNLOADED = 0,
RNDIS_IPA_INITIALIZED = 1,
RNDIS_IPA_CONNECTED = 2,
RNDIS_IPA_UP = 3,
RNDIS_IPA_CONNECTED_AND_UP = 4,
RNDIS_IPA_INVALID = 5,
};
/**
* enum rndis_ipa_operation - enumerations used to describe the API operation
*
* Those enums are used as input for the driver state machine.
*/
enum rndis_ipa_operation {
RNDIS_IPA_INITIALIZE,
RNDIS_IPA_CONNECT,
RNDIS_IPA_OPEN,
RNDIS_IPA_STOP,
RNDIS_IPA_DISCONNECT,
RNDIS_IPA_CLEANUP,
};
#define RNDIS_IPA_STATE_DEBUG(ctx) \
RNDIS_IPA_DEBUG("Driver state: %s\n",\
rndis_ipa_state_string(ctx->state));
/**
* struct rndis_loopback_pipe - hold all information needed for
* pipe loopback logic
*/
struct rndis_loopback_pipe {
struct sps_pipe *ipa_sps;
struct ipa_sps_params ipa_sps_connect;
struct ipa_connect_params ipa_connect_params;
struct sps_pipe *dma_sps;
struct sps_connect dma_connect;
struct sps_alloc_dma_chan dst_alloc;
struct sps_dma_chan ipa_sps_channel;
enum sps_mode mode;
u32 ipa_peer_bam_hdl;
u32 peer_pipe_index;
u32 ipa_drv_ep_hdl;
u32 ipa_pipe_index;
enum ipa_client_type ipa_client;
ipa_notify_cb ipa_callback;
struct ipa_ep_cfg *ipa_ep_cfg;
};
/**
* struct rndis_ipa_dev - main driver context parameters
*
* @net: network interface struct implemented by this driver
* @directory: debugfs directory for various debugging switches
* @tx_filter: flag that enable/disable Tx path to continue to IPA
* @tx_dropped: number of filtered out Tx packets
* @tx_dump_enable: dump all Tx packets
* @rx_filter: flag that enable/disable Rx path to continue to IPA
* @rx_dropped: number of filtered out Rx packets
* @rx_dump_enable: dump all Rx packets
* @icmp_filter: allow all ICMP packet to pass through the filters
* @rm_enable: flag that enable/disable Resource manager request prior to Tx
* @loopback_enable: flag that enable/disable USB stub loopback
* @deaggregation_enable: enable/disable IPA HW deaggregation logic
* @during_xmit_error: flags that indicate that the driver is in a middle
* of error handling in Tx path
* @usb_to_ipa_loopback_pipe: usb to ipa (Rx) pipe representation for loopback
* @ipa_to_usb_loopback_pipe: ipa to usb (Tx) pipe representation for loopback
* @bam_dma_hdl: handle representing bam-dma, used for loopback logic
* @directory: holds all debug flags used by the driver to allow cleanup
* for driver unload
* @eth_ipv4_hdr_hdl: saved handle for ipv4 header-insertion table
* @eth_ipv6_hdr_hdl: saved handle for ipv6 header-insertion table
* @usb_to_ipa_hdl: save handle for IPA pipe operations
* @ipa_to_usb_hdl: save handle for IPA pipe operations
* @outstanding_pkts: number of packets sent to IPA without TX complete ACKed
* @outstanding_high: number of outstanding packets allowed
* @outstanding_low: number of outstanding packets which shall cause
* to netdev queue start (after stopped due to outstanding_high reached)
* @error_msec_sleep_time: number of msec for sleeping in case of Tx error
* @state: current state of the driver
* @host_ethaddr: holds the tethered PC ethernet address
* @device_ethaddr: holds the device ethernet address
* @device_ready_notify: callback supplied by USB core driver
* This callback shall be called by the Netdev once the Netdev internal
* state is changed to RNDIS_IPA_CONNECTED_AND_UP
* @xmit_error_delayed_work: work item for cases where IPA driver Tx fails
*/
struct rndis_ipa_dev {
struct net_device *net;
u32 tx_filter;
u32 tx_dropped;
u32 tx_dump_enable;
u32 rx_filter;
u32 rx_dropped;
u32 rx_dump_enable;
u32 icmp_filter;
u32 rm_enable;
bool loopback_enable;
u32 deaggregation_enable;
u32 during_xmit_error;
struct rndis_loopback_pipe usb_to_ipa_loopback_pipe;
struct rndis_loopback_pipe ipa_to_usb_loopback_pipe;
u32 bam_dma_hdl;
struct dentry *directory;
uint32_t eth_ipv4_hdr_hdl;
uint32_t eth_ipv6_hdr_hdl;
u32 usb_to_ipa_hdl;
u32 ipa_to_usb_hdl;
atomic_t outstanding_pkts;
u32 outstanding_high;
u32 outstanding_low;
u32 error_msec_sleep_time;
enum rndis_ipa_state state;
u8 host_ethaddr[ETH_ALEN];
u8 device_ethaddr[ETH_ALEN];
void (*device_ready_notify)(void);
struct delayed_work xmit_error_delayed_work;
};
/**
* rndis_pkt_hdr - RNDIS_IPA representation of REMOTE_NDIS_PACKET_MSG
* @msg_type: for REMOTE_NDIS_PACKET_MSG this value should be 1
* @msg_len: total message length in bytes, including RNDIS header an payload
* @data_ofst: offset in bytes from start of the data_ofst to payload
* @data_len: payload size in bytes
* @zeroes: OOB place holder - not used for RNDIS_IPA.
*/
struct rndis_pkt_hdr {
__le32 msg_type;
__le32 msg_len;
__le32 data_ofst;
__le32 data_len;
__le32 zeroes[7];
} __packed__;
static int rndis_ipa_open(struct net_device *net);
static void rndis_ipa_packet_receive_notify(void *private,
enum ipa_dp_evt_type evt, unsigned long data);
static void rndis_ipa_tx_complete_notify(void *private,
enum ipa_dp_evt_type evt, unsigned long data);
static void rndis_ipa_tx_timeout(struct net_device *net);
static int rndis_ipa_stop(struct net_device *net);
static void rndis_ipa_enable_data_path(struct rndis_ipa_dev *rndis_ipa_ctx);
static struct sk_buff *rndis_encapsulate_skb(struct sk_buff *skb);
static void rndis_ipa_xmit_error(struct sk_buff *skb);
static void rndis_ipa_xmit_error_aftercare_wq(struct work_struct *work);
static void rndis_ipa_prepare_header_insertion(int eth_type,
const char *hdr_name, struct ipa_hdr_add *add_hdr,
const void *dst_mac, const void *src_mac);
static int rndis_ipa_hdrs_cfg(struct rndis_ipa_dev *rndis_ipa_ctx,
const void *dst_mac, const void *src_mac);
static int rndis_ipa_hdrs_destroy(struct rndis_ipa_dev *rndis_ipa_ctx);
static struct net_device_stats *rndis_ipa_get_stats(struct net_device *net);
static int rndis_ipa_register_properties(char *netdev_name);
static int rndis_ipa_deregister_properties(char *netdev_name);
static void rndis_ipa_rm_notify(void *user_data, enum ipa_rm_event event,
unsigned long data);
static int rndis_ipa_create_rm_resource(struct rndis_ipa_dev *rndis_ipa_ctx);
static int rndis_ipa_destory_rm_resource(struct rndis_ipa_dev *rndis_ipa_ctx);
static bool rx_filter(struct sk_buff *skb);
static bool tx_filter(struct sk_buff *skb);
static bool rm_enabled(struct rndis_ipa_dev *rndis_ipa_ctx);
static int resource_request(struct rndis_ipa_dev *rndis_ipa_ctx);
static void resource_release(struct rndis_ipa_dev *rndis_ipa_ctx);
static netdev_tx_t rndis_ipa_start_xmit(struct sk_buff *skb,
struct net_device *net);
static int rndis_ipa_loopback_pipe_create(
struct rndis_ipa_dev *rndis_ipa_ctx,
struct rndis_loopback_pipe *loopback_pipe);
static void rndis_ipa_destroy_loopback_pipe(
struct rndis_loopback_pipe *loopback_pipe);
static int rndis_ipa_create_loopback(struct rndis_ipa_dev *rndis_ipa_ctx);
static void rndis_ipa_destroy_loopback(struct rndis_ipa_dev *rndis_ipa_ctx);
static int rndis_ipa_setup_loopback(bool enable,
struct rndis_ipa_dev *rndis_ipa_ctx);
static int rndis_ipa_debugfs_loopback_open(struct inode *inode,
struct file *file);
static int rndis_ipa_debugfs_atomic_open(struct inode *inode,
struct file *file);
static int rndis_ipa_debugfs_aggr_open(struct inode *inode,
struct file *file);
static ssize_t rndis_ipa_debugfs_aggr_write(struct file *file,
const char __user *buf, size_t count, loff_t *ppos);
static ssize_t rndis_ipa_debugfs_loopback_write(struct file *file,
const char __user *buf, size_t count, loff_t *ppos);
static ssize_t rndis_ipa_debugfs_enable_write(struct file *file,
const char __user *buf, size_t count, loff_t *ppos);
static ssize_t rndis_ipa_debugfs_enable_read(struct file *file,
char __user *ubuf, size_t count, loff_t *ppos);
static ssize_t rndis_ipa_debugfs_loopback_read(struct file *file,
char __user *ubuf, size_t count, loff_t *ppos);
static ssize_t rndis_ipa_debugfs_atomic_read(struct file *file,
char __user *ubuf, size_t count, loff_t *ppos);
static void rndis_ipa_dump_skb(struct sk_buff *skb);
static int rndis_ipa_debugfs_init(struct rndis_ipa_dev *rndis_ipa_ctx);
static void rndis_ipa_debugfs_destroy(struct rndis_ipa_dev *rndis_ipa_ctx);
static int rndis_ipa_ep_registers_cfg(u32 usb_to_ipa_hdl,
u32 ipa_to_usb_hdl, u32 max_xfer_size_bytes_to_dev,
u32 max_xfer_size_bytes_to_host, u32 mtu,
bool deaggr_enable);
static int rndis_ipa_set_device_ethernet_addr(u8 *dev_ethaddr,
u8 device_ethaddr[]);
static enum rndis_ipa_state rndis_ipa_next_state(
enum rndis_ipa_state current_state,
enum rndis_ipa_operation operation);
static const char *rndis_ipa_state_string(enum rndis_ipa_state state);
static int rndis_ipa_init_module(void);
static void rndis_ipa_cleanup_module(void);
struct rndis_ipa_dev *rndis_ipa;
static const struct net_device_ops rndis_ipa_netdev_ops = {
.ndo_open = rndis_ipa_open,
.ndo_stop = rndis_ipa_stop,
.ndo_start_xmit = rndis_ipa_start_xmit,
.ndo_tx_timeout = rndis_ipa_tx_timeout,
.ndo_get_stats = rndis_ipa_get_stats,
.ndo_set_mac_address = eth_mac_addr,
};
const struct file_operations rndis_ipa_debugfs_atomic_ops = {
.open = rndis_ipa_debugfs_atomic_open,
.read = rndis_ipa_debugfs_atomic_read,
};
const struct file_operations rndis_ipa_loopback_ops = {
.open = rndis_ipa_debugfs_loopback_open,
.read = rndis_ipa_debugfs_loopback_read,
.write = rndis_ipa_debugfs_loopback_write,
};
const struct file_operations rndis_ipa_aggr_ops = {
.open = rndis_ipa_debugfs_aggr_open,
.write = rndis_ipa_debugfs_aggr_write,
};
static struct ipa_ep_cfg ipa_to_usb_ep_cfg = {
.mode = {
.mode = IPA_BASIC,
.dst = IPA_CLIENT_APPS_LAN_CONS,
},
.hdr = {
.hdr_len = ETH_HLEN + sizeof(struct rndis_pkt_hdr),
.hdr_ofst_metadata_valid = false,
.hdr_ofst_metadata = 0,
.hdr_additional_const_len = ETH_HLEN,
.hdr_ofst_pkt_size_valid = true,
.hdr_ofst_pkt_size = 3*sizeof(u32),
.hdr_a5_mux = false,
.hdr_remove_additional = false,
.hdr_metadata_reg_valid = false,
},
.hdr_ext = {
.hdr_pad_to_alignment = 0,
.hdr_total_len_or_pad_offset = 1*sizeof(u32),
.hdr_payload_len_inc_padding = false,
.hdr_total_len_or_pad = IPA_HDR_TOTAL_LEN,
.hdr_total_len_or_pad_valid = true,
.hdr_little_endian = true,
},
.aggr = {
.aggr_en = IPA_ENABLE_AGGR,
.aggr = IPA_GENERIC,
.aggr_byte_limit = 4,
.aggr_time_limit = DEFAULT_AGGR_TIME_LIMIT,
.aggr_pkt_limit = DEFAULT_AGGR_PKT_LIMIT
},
.deaggr = {
.deaggr_hdr_len = 0,
.packet_offset_valid = 0,
.packet_offset_location = 0,
.max_packet_len = 0,
},
.route = {
.rt_tbl_hdl = RNDIS_IPA_DFLT_RT_HDL,
},
.nat = {
.nat_en = IPA_SRC_NAT,
},
};
static struct ipa_ep_cfg usb_to_ipa_ep_cfg_deaggr_dis = {
.mode = {
.mode = IPA_BASIC,
.dst = IPA_CLIENT_APPS_LAN_CONS,
},
.hdr = {
.hdr_len = ETH_HLEN + sizeof(struct rndis_pkt_hdr),
.hdr_ofst_metadata_valid = false,
.hdr_ofst_metadata = 0,
.hdr_additional_const_len = 0,
.hdr_ofst_pkt_size_valid = true,
.hdr_ofst_pkt_size = 3*sizeof(u32) +
sizeof(struct rndis_pkt_hdr),
.hdr_a5_mux = false,
.hdr_remove_additional = false,
.hdr_metadata_reg_valid = false,
},
.hdr_ext = {
.hdr_pad_to_alignment = 0,
.hdr_total_len_or_pad_offset = 1*sizeof(u32),
.hdr_payload_len_inc_padding = false,
.hdr_total_len_or_pad = IPA_HDR_TOTAL_LEN,
.hdr_total_len_or_pad_valid = true,
.hdr_little_endian = true,
},
.aggr = {
.aggr_en = IPA_BYPASS_AGGR,
.aggr = 0,
.aggr_byte_limit = 0,
.aggr_time_limit = 0,
.aggr_pkt_limit = 0,
},
.deaggr = {
.deaggr_hdr_len = 0,
.packet_offset_valid = false,
.packet_offset_location = 0,
.max_packet_len = 0,
},
.route = {
.rt_tbl_hdl = RNDIS_IPA_DFLT_RT_HDL,
},
.nat = {
.nat_en = IPA_BYPASS_NAT,
},
};
static struct ipa_ep_cfg usb_to_ipa_ep_cfg_deaggr_en = {
.mode = {
.mode = IPA_BASIC,
.dst = IPA_CLIENT_APPS_LAN_CONS,
},
.hdr = {
.hdr_len = ETH_HLEN,
.hdr_ofst_metadata_valid = false,
.hdr_ofst_metadata = 0,
.hdr_additional_const_len = 0,
.hdr_ofst_pkt_size_valid = true,
.hdr_ofst_pkt_size = 3*sizeof(u32),
.hdr_a5_mux = false,
.hdr_remove_additional = false,
.hdr_metadata_reg_valid = false,
},
.hdr_ext = {
.hdr_pad_to_alignment = 0,
.hdr_total_len_or_pad_offset = 1*sizeof(u32),
.hdr_payload_len_inc_padding = false,
.hdr_total_len_or_pad = IPA_HDR_TOTAL_LEN,
.hdr_total_len_or_pad_valid = true,
.hdr_little_endian = true,
},
.aggr = {
.aggr_en = IPA_ENABLE_DEAGGR,
.aggr = IPA_GENERIC,
.aggr_byte_limit = 0,
.aggr_time_limit = 0,
.aggr_pkt_limit = 0,
},
.deaggr = {
.deaggr_hdr_len = sizeof(struct rndis_pkt_hdr),
.packet_offset_valid = true,
.packet_offset_location = 8,
.max_packet_len = 8192, /* Will be overridden*/
},
.route = {
.rt_tbl_hdl = RNDIS_IPA_DFLT_RT_HDL,
},
.nat = {
.nat_en = IPA_BYPASS_NAT,
},
};
/**
* rndis_template_hdr - RNDIS template structure for RNDIS_IPA SW insertion
* @msg_type: set for REMOTE_NDIS_PACKET_MSG (0x00000001)
* this value will be used for all data packets
* @msg_len: will add the skb length to get final size
* @data_ofst: this field value will not be changed
* @data_len: set as skb length to get final size
* @zeroes: make sure all OOB data is not used
*/
struct rndis_pkt_hdr rndis_template_hdr = {
.msg_type = RNDIS_IPA_PKT_TYPE,
.msg_len = sizeof(struct rndis_pkt_hdr),
.data_ofst = sizeof(struct rndis_pkt_hdr) - RNDIS_HDR_OFST(data_ofst),
.data_len = 0,
.zeroes = {0},
};
/**
* rndis_ipa_init() - create network device and initialize internal
* data structures
* @params: in/out parameters required for initialization,
* see "struct ipa_usb_init_params" for more details
*
* Shall be called prior to pipe connection.
* Detailed description:
* - allocate the network device
* - set default values for driver internal switches and stash them inside
* the netdev private field
* - set needed headroom for RNDIS header
* - create debugfs folder and files
* - create IPA resource manager client
* - set the ethernet address for the netdev to be added on SW Tx path
* - add header insertion rules for IPA driver (based on host/device Ethernet
* addresses given in input params and on RNDIS data template struct)
* - register tx/rx properties to IPA driver (will be later used
* by IPA configuration manager to configure rest of the IPA rules)
* - set the carrier state to "off" (until connect is called)
* - register the network device
* - set the out parameters
* - change driver internal state to INITIALIZED
*
* Returns negative errno, or zero on success
*/
int rndis_ipa_init(struct ipa_usb_init_params *params)
{
int result = 0;
struct net_device *net;
struct rndis_ipa_dev *rndis_ipa_ctx;
RNDIS_IPA_LOG_ENTRY();
RNDIS_IPA_DEBUG("%s initializing\n", DRV_NAME);
NULL_CHECK_RETVAL(params);
RNDIS_IPA_DEBUG("host_ethaddr=%pM, device_ethaddr=%pM\n",
params->host_ethaddr,
params->device_ethaddr);
net = alloc_etherdev(sizeof(struct rndis_ipa_dev));
if (!net) {
result = -ENOMEM;
RNDIS_IPA_ERROR("fail to allocate Ethernet device\n");
goto fail_alloc_etherdev;
}
RNDIS_IPA_DEBUG("network device was successfully allocated\n");
rndis_ipa_ctx = netdev_priv(net);
if (!rndis_ipa_ctx) {
result = -ENOMEM;
RNDIS_IPA_ERROR("fail to extract netdev priv\n");
goto fail_netdev_priv;
}
memset(rndis_ipa_ctx, 0, sizeof(*rndis_ipa_ctx));
RNDIS_IPA_DEBUG("rndis_ipa_ctx (private)=%p\n", rndis_ipa_ctx);
rndis_ipa_ctx->net = net;
rndis_ipa_ctx->tx_filter = false;
rndis_ipa_ctx->rx_filter = false;
rndis_ipa_ctx->icmp_filter = true;
rndis_ipa_ctx->rm_enable = true;
rndis_ipa_ctx->tx_dropped = 0;
rndis_ipa_ctx->rx_dropped = 0;
rndis_ipa_ctx->tx_dump_enable = false;
rndis_ipa_ctx->rx_dump_enable = false;
rndis_ipa_ctx->deaggregation_enable = false;
rndis_ipa_ctx->outstanding_high = DEFAULT_OUTSTANDING_HIGH;
rndis_ipa_ctx->outstanding_low = DEFAULT_OUTSTANDING_LOW;
atomic_set(&rndis_ipa_ctx->outstanding_pkts, 0);
memcpy(rndis_ipa_ctx->device_ethaddr, params->device_ethaddr,
sizeof(rndis_ipa_ctx->device_ethaddr));
memcpy(rndis_ipa_ctx->host_ethaddr, params->host_ethaddr,
sizeof(rndis_ipa_ctx->host_ethaddr));
INIT_DELAYED_WORK(&rndis_ipa_ctx->xmit_error_delayed_work,
rndis_ipa_xmit_error_aftercare_wq);
rndis_ipa_ctx->error_msec_sleep_time =
MIN_TX_ERROR_SLEEP_PERIOD;
RNDIS_IPA_DEBUG("internal data structures were set\n");
if (!params->device_ready_notify)
RNDIS_IPA_DEBUG("device_ready_notify() was not supplied\n");
rndis_ipa_ctx->device_ready_notify = params->device_ready_notify;
snprintf(net->name, sizeof(net->name), "%s%%d", NETDEV_NAME);
RNDIS_IPA_DEBUG("Setting network interface driver name to: %s\n",
net->name);
net->netdev_ops = &rndis_ipa_netdev_ops;
net->watchdog_timeo = TX_TIMEOUT;
net->needed_headroom = sizeof(rndis_template_hdr);
RNDIS_IPA_DEBUG("Needed headroom for RNDIS header set to %d\n",
net->needed_headroom);
result = rndis_ipa_debugfs_init(rndis_ipa_ctx);
if (result)
goto fail_debugfs;
RNDIS_IPA_DEBUG("debugfs entries were created\n");
result = rndis_ipa_set_device_ethernet_addr(net->dev_addr,
rndis_ipa_ctx->device_ethaddr);
if (result) {
RNDIS_IPA_ERROR("set device MAC failed\n");
goto fail_set_device_ethernet;
}
RNDIS_IPA_DEBUG("Device Ethernet address set %pM\n", net->dev_addr);
result = rndis_ipa_hdrs_cfg(rndis_ipa_ctx,
params->host_ethaddr,
params->device_ethaddr);
if (result) {
RNDIS_IPA_ERROR("fail on ipa hdrs set\n");
goto fail_hdrs_cfg;
}
RNDIS_IPA_DEBUG("IPA header-insertion configed for Ethernet+RNDIS\n");
result = rndis_ipa_register_properties(net->name);
if (result) {
RNDIS_IPA_ERROR("fail on properties set\n");
goto fail_register_tx;
}
RNDIS_IPA_DEBUG("2 TX and 2 RX properties were registered\n");
netif_carrier_off(net);
RNDIS_IPA_DEBUG("set carrier off until pipes are connected\n");
result = register_netdev(net);
if (result) {
RNDIS_IPA_ERROR("register_netdev failed: %d\n", result);
goto fail_register_netdev;
}
RNDIS_IPA_DEBUG("netdev:%s registration succeeded, index=%d\n",
net->name, net->ifindex);
rndis_ipa = rndis_ipa_ctx;
params->ipa_rx_notify = rndis_ipa_packet_receive_notify;
params->ipa_tx_notify = rndis_ipa_tx_complete_notify;
params->private = rndis_ipa_ctx;
params->skip_ep_cfg = false;
rndis_ipa_ctx->state = RNDIS_IPA_INITIALIZED;
RNDIS_IPA_STATE_DEBUG(rndis_ipa_ctx);
pr_info("RNDIS_IPA NetDev was initialized");
RNDIS_IPA_LOG_EXIT();
return 0;
fail_register_netdev:
rndis_ipa_deregister_properties(net->name);
fail_register_tx:
rndis_ipa_hdrs_destroy(rndis_ipa_ctx);
fail_set_device_ethernet:
fail_hdrs_cfg:
rndis_ipa_debugfs_destroy(rndis_ipa_ctx);
fail_debugfs:
fail_netdev_priv:
free_netdev(net);
fail_alloc_etherdev:
return result;
}
EXPORT_SYMBOL(rndis_ipa_init);
/**
* rndis_ipa_pipe_connect_notify() - notify rndis_ipa Netdev that the USB pipes
* were connected
* @usb_to_ipa_hdl: handle from IPA driver client for USB->IPA
* @ipa_to_usb_hdl: handle from IPA driver client for IPA->USB
* @private: same value that was set by init(), this parameter holds the
* network device pointer.
* @max_transfer_byte_size: RNDIS protocol specific, the maximum size that
* the host expect
* @max_packet_number: RNDIS protocol specific, the maximum packet number
* that the host expects
*
* Once USB driver finishes the pipe connection between IPA core
* and USB core this method shall be called in order to
* allow the driver to complete the data path configurations.
* Detailed description:
* - configure the IPA end-points register
* - notify the Linux kernel for "carrier_on"
* - change the driver internal state
*
* After this function is done the driver state changes to "Connected" or
* Connected and Up.
* This API is expected to be called after initialization() or
* after a call to disconnect().
*
* Returns negative errno, or zero on success
*/
int rndis_ipa_pipe_connect_notify(u32 usb_to_ipa_hdl,
u32 ipa_to_usb_hdl,
u32 max_xfer_size_bytes_to_dev,
u32 max_packet_number_to_dev,
u32 max_xfer_size_bytes_to_host,
void *private)
{
struct rndis_ipa_dev *rndis_ipa_ctx = private;
int next_state;
int result;
RNDIS_IPA_LOG_ENTRY();
NULL_CHECK_RETVAL(private);
RNDIS_IPA_DEBUG("usb_to_ipa_hdl=%d, ipa_to_usb_hdl=%d, private=0x%p\n",
usb_to_ipa_hdl, ipa_to_usb_hdl, private);
RNDIS_IPA_DEBUG("max_xfer_sz_to_dev=%d, max_pkt_num_to_dev=%d\n",
max_xfer_size_bytes_to_dev,
max_packet_number_to_dev);
RNDIS_IPA_DEBUG("max_xfer_sz_to_host=%d\n",
max_xfer_size_bytes_to_host);
next_state = rndis_ipa_next_state(rndis_ipa_ctx->state,
RNDIS_IPA_CONNECT);
if (next_state == RNDIS_IPA_INVALID) {
RNDIS_IPA_ERROR("use init()/disconnect() before connect()\n");
return -EPERM;
}
if (usb_to_ipa_hdl >= IPA_CLIENT_MAX) {
RNDIS_IPA_ERROR("usb_to_ipa_hdl(%d) - not valid ipa handle\n",
usb_to_ipa_hdl);
return -EINVAL;
}
if (ipa_to_usb_hdl >= IPA_CLIENT_MAX) {
RNDIS_IPA_ERROR("ipa_to_usb_hdl(%d) - not valid ipa handle\n",
ipa_to_usb_hdl);
return -EINVAL;
}
result = rndis_ipa_create_rm_resource(rndis_ipa_ctx);
if (result) {
RNDIS_IPA_ERROR("fail on RM create\n");
goto fail_create_rm;
}
RNDIS_IPA_DEBUG("RM resource was created\n");
rndis_ipa_ctx->ipa_to_usb_hdl = ipa_to_usb_hdl;
rndis_ipa_ctx->usb_to_ipa_hdl = usb_to_ipa_hdl;
if (max_packet_number_to_dev > 1)
rndis_ipa_ctx->deaggregation_enable = true;
else
rndis_ipa_ctx->deaggregation_enable = false;
result = rndis_ipa_ep_registers_cfg(usb_to_ipa_hdl,
ipa_to_usb_hdl,
max_xfer_size_bytes_to_dev,
max_xfer_size_bytes_to_host,
rndis_ipa_ctx->net->mtu,
rndis_ipa_ctx->deaggregation_enable);
if (result) {
RNDIS_IPA_ERROR("fail on ep cfg\n");
goto fail;
}
RNDIS_IPA_DEBUG("end-points configured\n");
netif_stop_queue(rndis_ipa_ctx->net);
RNDIS_IPA_DEBUG("netif_stop_queue() was called\n");
netif_carrier_on(rndis_ipa_ctx->net);
if (!netif_carrier_ok(rndis_ipa_ctx->net)) {
RNDIS_IPA_ERROR("netif_carrier_ok error\n");
result = -EBUSY;
goto fail;
}
RNDIS_IPA_DEBUG("netif_carrier_on() was called\n");
rndis_ipa_ctx->state = next_state;
RNDIS_IPA_STATE_DEBUG(rndis_ipa_ctx);
if (next_state == RNDIS_IPA_CONNECTED_AND_UP)
rndis_ipa_enable_data_path(rndis_ipa_ctx);
else
RNDIS_IPA_DEBUG("queue shall be started after open()\n");
pr_info("RNDIS_IPA NetDev pipes were connected\n");
RNDIS_IPA_LOG_EXIT();
return 0;
fail:
rndis_ipa_destory_rm_resource(rndis_ipa_ctx);
fail_create_rm:
return result;
}
EXPORT_SYMBOL(rndis_ipa_pipe_connect_notify);
/**
* rndis_ipa_open() - notify Linux network stack to start sending packets
* @net: the network interface supplied by the network stack
*
* Linux uses this API to notify the driver that the network interface
* transitions to the up state.
* The driver will instruct the Linux network stack to start
* delivering data packets.
* The driver internal state shall be changed to Up or Connected and Up
*
* Returns negative errno, or zero on success
*/
static int rndis_ipa_open(struct net_device *net)
{
struct rndis_ipa_dev *rndis_ipa_ctx;
int next_state;
RNDIS_IPA_LOG_ENTRY();
rndis_ipa_ctx = netdev_priv(net);
next_state = rndis_ipa_next_state(rndis_ipa_ctx->state, RNDIS_IPA_OPEN);
if (next_state == RNDIS_IPA_INVALID) {
RNDIS_IPA_ERROR("can't bring driver up before initialize\n");
return -EPERM;
}
rndis_ipa_ctx->state = next_state;
RNDIS_IPA_STATE_DEBUG(rndis_ipa_ctx);
if (next_state == RNDIS_IPA_CONNECTED_AND_UP)
rndis_ipa_enable_data_path(rndis_ipa_ctx);
else
RNDIS_IPA_DEBUG("queue shall be started after connect()\n");
pr_info("RNDIS_IPA NetDev was opened\n");
RNDIS_IPA_LOG_EXIT();
return 0;
}
/**
* rndis_ipa_start_xmit() - send data from APPs to USB core via IPA core
* using SW path (Tx data path)
* Tx path for this Netdev is Apps-processor->IPA->USB
* @skb: packet received from Linux network stack destined for tethered PC
* @net: the network device being used to send this packet (rndis0)
*
* Several conditions needed in order to send the packet to IPA:
* - Transmit queue for the network driver is currently
* in "started" state
* - The driver internal state is in Connected and Up state.
* - Filters Tx switch are turned off
* - The IPA resource manager state for the driver producer client
* is "Granted" which implies that all the resources in the dependency
* graph are valid for data flow.
* - outstanding high boundary was not reached.
*
* In case the outstanding packets high boundary is reached, the driver will
* stop the send queue until enough packets are processed by
* the IPA core (based on calls to rndis_ipa_tx_complete_notify).
*
* In case all of the conditions are met, the network driver shall:
* - encapsulate the Ethernet packet with RNDIS header (REMOTE_NDIS_PACKET_MSG)
* - send the packet by using IPA Driver SW path (IP_PACKET_INIT)
* - Netdev status fields shall be updated based on the current Tx packet
*
* Returns NETDEV_TX_BUSY if retry should be made later,
* or NETDEV_TX_OK on success.
*/
static netdev_tx_t rndis_ipa_start_xmit(struct sk_buff *skb,
struct net_device *net)
{
int ret;
netdev_tx_t status = NETDEV_TX_BUSY;
struct rndis_ipa_dev *rndis_ipa_ctx = netdev_priv(net);
net->trans_start = jiffies;
RNDIS_IPA_DEBUG("Tx, len=%d, skb->protocol=%d, outstanding=%d\n",
skb->len, skb->protocol,
atomic_read(&rndis_ipa_ctx->outstanding_pkts));
if (unlikely(netif_queue_stopped(net))) {
RNDIS_IPA_ERROR("interface queue is stopped\n");
goto out;
}
if (unlikely(rndis_ipa_ctx->tx_dump_enable))
rndis_ipa_dump_skb(skb);
if (unlikely(rndis_ipa_ctx->state != RNDIS_IPA_CONNECTED_AND_UP)) {
RNDIS_IPA_ERROR("Missing pipe connected and/or iface up\n");
return NETDEV_TX_BUSY;
}
if (unlikely(tx_filter(skb))) {
dev_kfree_skb_any(skb);
RNDIS_IPA_DEBUG("packet got filtered out on Tx path\n");
rndis_ipa_ctx->tx_dropped++;
status = NETDEV_TX_OK;
goto out;
}
ret = resource_request(rndis_ipa_ctx);
if (ret) {
RNDIS_IPA_DEBUG("Waiting to resource\n");
netif_stop_queue(net);
goto resource_busy;
}
if (atomic_read(&rndis_ipa_ctx->outstanding_pkts) >=
rndis_ipa_ctx->outstanding_high) {
RNDIS_IPA_DEBUG("Outstanding high boundary reached (%d)\n",
rndis_ipa_ctx->outstanding_high);
netif_stop_queue(net);
RNDIS_IPA_DEBUG("send queue was stopped\n");
status = NETDEV_TX_BUSY;
goto out;
}
skb = rndis_encapsulate_skb(skb);
trace_rndis_tx_dp(skb->protocol);
ret = ipa_tx_dp(IPA_TO_USB_CLIENT, skb, NULL);
if (ret) {
RNDIS_IPA_ERROR("ipa transmit failed (%d)\n", ret);
goto fail_tx_packet;
}
atomic_inc(&rndis_ipa_ctx->outstanding_pkts);
status = NETDEV_TX_OK;
goto out;
fail_tx_packet:
rndis_ipa_xmit_error(skb);
out:
resource_release(rndis_ipa_ctx);
resource_busy:
RNDIS_IPA_DEBUG("packet Tx done - %s\n",
(status == NETDEV_TX_OK) ? "OK" : "FAIL");
return status;
}
/**
* rndis_ipa_tx_complete_notify() - notification for Netdev that the
* last packet was successfully sent
* @private: driver context stashed by IPA driver upon pipe connect
* @evt: event type (expected to be write-done event)
* @data: data provided with event (this is actually the skb that
* holds the sent packet)
*
* This function will be called on interrupt bottom halve deferred context.
* outstanding packets counter shall be decremented.
* Network stack send queue will be re-started in case low outstanding
* boundary is reached and queue was stopped before.
* At the end the skb shall be freed.
*/
static void rndis_ipa_tx_complete_notify(void *private,
enum ipa_dp_evt_type evt,
unsigned long data)
{
struct sk_buff *skb = (struct sk_buff *)data;
struct rndis_ipa_dev *rndis_ipa_ctx = private;
NULL_CHECK_NO_RETVAL(private);
trace_rndis_status_rcvd(skb->protocol);
RNDIS_IPA_DEBUG("Tx-complete, len=%d, skb->prot=%d, outstanding=%d\n",
skb->len, skb->protocol,
atomic_read(&rndis_ipa_ctx->outstanding_pkts));
if (unlikely((evt != IPA_WRITE_DONE))) {
RNDIS_IPA_ERROR("unsupported event on TX call-back\n");
return;
}
if (unlikely(rndis_ipa_ctx->state != RNDIS_IPA_CONNECTED_AND_UP)) {
RNDIS_IPA_DEBUG("dropping Tx-complete pkt, state=%s\n",
rndis_ipa_state_string(rndis_ipa_ctx->state));
goto out;
}
rndis_ipa_ctx->net->stats.tx_packets++;
rndis_ipa_ctx->net->stats.tx_bytes += skb->len;
atomic_dec(&rndis_ipa_ctx->outstanding_pkts);
if (netif_queue_stopped(rndis_ipa_ctx->net) &&
netif_carrier_ok(rndis_ipa_ctx->net) &&
atomic_read(&rndis_ipa_ctx->outstanding_pkts) <
(rndis_ipa_ctx->outstanding_low)) {
RNDIS_IPA_DEBUG("outstanding low boundary reached (%d)n",
rndis_ipa_ctx->outstanding_low);
netif_wake_queue(rndis_ipa_ctx->net);
RNDIS_IPA_DEBUG("send queue was awaken\n");
}
out:
dev_kfree_skb_any(skb);
return;
}
static void rndis_ipa_tx_timeout(struct net_device *net)
{
struct rndis_ipa_dev *rndis_ipa_ctx = netdev_priv(net);
int outstanding = atomic_read(&rndis_ipa_ctx->outstanding_pkts);
RNDIS_IPA_ERROR("possible IPA stall was detected, %d outstanding\n",
outstanding);
net->stats.tx_errors++;
}
/**
* rndis_ipa_rm_notify() - callback supplied to IPA resource manager
* for grant/release events
* user_data: the driver context supplied to IPA resource manager during call
* to ipa_rm_create_resource().
* event: the event notified to us by IPA resource manager (Release/Grant)
* data: reserved field supplied by IPA resource manager
*
* This callback shall be called based on resource request/release sent
* to the IPA resource manager.
* In case the queue was stopped during EINPROGRESS for Tx path and the
* event received is Grant then the queue shall be restarted.
* In case the event notified is a release notification the netdev discard it.
*/
static void rndis_ipa_rm_notify(void *user_data, enum ipa_rm_event event,
unsigned long data)
{
struct rndis_ipa_dev *rndis_ipa_ctx = user_data;
RNDIS_IPA_LOG_ENTRY();
if (event == IPA_RM_RESOURCE_RELEASED) {
RNDIS_IPA_DEBUG("Resource Released\n");
return;
}
if (event != IPA_RM_RESOURCE_GRANTED) {
RNDIS_IPA_ERROR("Unexceoted event receieved from RM (%d\n)",
event);
return;
}
RNDIS_IPA_DEBUG("Resource Granted\n");
if (netif_queue_stopped(rndis_ipa_ctx->net)) {
RNDIS_IPA_DEBUG("starting queue\n");
netif_start_queue(rndis_ipa_ctx->net);
} else {
RNDIS_IPA_DEBUG("queue already awake\n");
}
RNDIS_IPA_LOG_EXIT();
}
/**
* rndis_ipa_packet_receive_notify() - Rx notify for packet sent from
* tethered PC (USB->IPA).
* is USB->IPA->Apps-processor
* @private: driver context
* @evt: event type
* @data: data provided with event
*
* Once IPA driver receives a packet from USB client this callback will be
* called from bottom-half interrupt handling context (ipa Rx workqueue).
*
* Packets that shall be sent to Apps processor may be of two types:
* 1) Packets that are destined for Apps (e.g: WEBSERVER running on Apps)
* 2) Exception packets that need special handling (based on IPA core
* configuration, e.g: new TCP session or any other packets that IPA core
* can't handle)
* If the next conditions are met, the packet shall be sent up to the
* Linux network stack:
* - Driver internal state is Connected and Up
* - Notification received from IPA driver meets the expected type
* for Rx packet
* -Filters Rx switch are turned off
*
* Prior to the sending to the network stack:
* - Netdev struct shall be stashed to the skb as required by the network stack
* - Ethernet header shall be removed (skb->data shall point to the Ethernet
* payload, Ethernet still stashed under MAC header).
* - The skb->pkt_protocol shall be set based on the ethernet destination
* address, Can be Broadcast, Multicast or Other-Host, The later
* pkt-types packets shall be dropped in case the Netdev is not
* in promisc mode.
* - Set the skb protocol field based on the EtherType field
*
* Netdev status fields shall be updated based on the current Rx packet
*/
static void rndis_ipa_packet_receive_notify(void *private,
enum ipa_dp_evt_type evt,
unsigned long data)
{
struct sk_buff *skb = (struct sk_buff *)data;
struct rndis_ipa_dev *rndis_ipa_ctx = private;
int result;
unsigned int packet_len = skb->len;
RNDIS_IPA_DEBUG("packet Rx, len=%d\n",
skb->len);
if (unlikely(rndis_ipa_ctx->rx_dump_enable))
rndis_ipa_dump_skb(skb);
if (unlikely(rndis_ipa_ctx->state != RNDIS_IPA_CONNECTED_AND_UP)) {
RNDIS_IPA_DEBUG("use connect()/up() before receive()\n");
RNDIS_IPA_DEBUG("packet dropped (length=%d)\n",
skb->len);
return;
}
if (evt != IPA_RECEIVE) {
RNDIS_IPA_ERROR("a none IPA_RECEIVE event in driver RX\n");
return;
}
if (!rndis_ipa_ctx->deaggregation_enable)
skb_pull(skb, sizeof(struct rndis_pkt_hdr));
skb->dev = rndis_ipa_ctx->net;
skb->protocol = eth_type_trans(skb, rndis_ipa_ctx->net);
if (rx_filter(skb)) {
RNDIS_IPA_DEBUG("packet got filtered out on RX path\n");
rndis_ipa_ctx->rx_dropped++;
dev_kfree_skb_any(skb);
return;
}
trace_rndis_netif_ni(skb->protocol);
result = netif_rx_ni(skb);
if (result)
RNDIS_IPA_ERROR("fail on netif_rx_ni\n");
rndis_ipa_ctx->net->stats.rx_packets++;
rndis_ipa_ctx->net->stats.rx_bytes += packet_len;
return;
}
/** rndis_ipa_stop() - notify the network interface to stop
* sending/receiving data
* @net: the network device being stopped.
*
* This API is used by Linux network stack to notify the network driver that
* its state was changed to "down"
* The driver will stop the "send" queue and change its internal
* state to "Connected".
* The Netdev shall be returned to be "Up" after rndis_ipa_open().
*/
static int rndis_ipa_stop(struct net_device *net)
{
struct rndis_ipa_dev *rndis_ipa_ctx = netdev_priv(net);
int next_state;
RNDIS_IPA_LOG_ENTRY();
next_state = rndis_ipa_next_state(rndis_ipa_ctx->state, RNDIS_IPA_STOP);
if (next_state == RNDIS_IPA_INVALID) {
RNDIS_IPA_DEBUG("can't do network interface down without up\n");
return -EPERM;
}
netif_stop_queue(net);
pr_info("RNDIS_IPA NetDev queue is stopped\n");
rndis_ipa_ctx->state = next_state;
RNDIS_IPA_STATE_DEBUG(rndis_ipa_ctx);
RNDIS_IPA_LOG_EXIT();
return 0;
}
/** rndis_ipa_disconnect() - notify rndis_ipa Netdev that the USB pipes
* were disconnected
* @private: same value that was set by init(), this parameter holds the
* network device pointer.
*
* USB shall notify the Netdev after disconnecting the pipe.
* - The internal driver state shall returned to its previous
* state (Up or Initialized).
* - Linux network stack shall be informed for carrier off to notify
* user space for pipe disconnect
* - send queue shall be stopped
* During the transition between the pipe disconnection to
* the Netdev notification packets
* are expected to be dropped by IPA driver or IPA core.
*/
int rndis_ipa_pipe_disconnect_notify(void *private)
{
struct rndis_ipa_dev *rndis_ipa_ctx = private;
int next_state;
int outstanding_dropped_pkts;
int retval;
RNDIS_IPA_LOG_ENTRY();
NULL_CHECK_RETVAL(rndis_ipa_ctx);
RNDIS_IPA_DEBUG("private=0x%p\n", private);
next_state = rndis_ipa_next_state(rndis_ipa_ctx->state,
RNDIS_IPA_DISCONNECT);
if (next_state == RNDIS_IPA_INVALID) {
RNDIS_IPA_ERROR("can't disconnect before connect\n");
return -EPERM;
}
if (rndis_ipa_ctx->during_xmit_error) {
RNDIS_IPA_DEBUG("canceling xmit-error delayed work\n");
cancel_delayed_work_sync(
&rndis_ipa_ctx->xmit_error_delayed_work);
rndis_ipa_ctx->during_xmit_error = false;
}
netif_carrier_off(rndis_ipa_ctx->net);
RNDIS_IPA_DEBUG("carrier_off notification was sent\n");
netif_stop_queue(rndis_ipa_ctx->net);
RNDIS_IPA_DEBUG("queue stopped\n");
outstanding_dropped_pkts =
atomic_read(&rndis_ipa_ctx->outstanding_pkts);
rndis_ipa_ctx->net->stats.tx_dropped += outstanding_dropped_pkts;
atomic_set(&rndis_ipa_ctx->outstanding_pkts, 0);
retval = rndis_ipa_destory_rm_resource(rndis_ipa_ctx);
if (retval) {
RNDIS_IPA_ERROR("Fail to clean RM\n");
return retval;
}
RNDIS_IPA_DEBUG("RM was successfully destroyed\n");
rndis_ipa_ctx->state = next_state;
RNDIS_IPA_STATE_DEBUG(rndis_ipa_ctx);
pr_info("RNDIS_IPA NetDev pipes disconnected (%d outstanding clr)\n",
outstanding_dropped_pkts);
RNDIS_IPA_LOG_EXIT();
return 0;
}
EXPORT_SYMBOL(rndis_ipa_pipe_disconnect_notify);
/**
* rndis_ipa_cleanup() - unregister the network interface driver and free
* internal data structs.
* @private: same value that was set by init(), this
* parameter holds the network device pointer.
*
* This function shall be called once the network interface is not
* needed anymore, e.g: when the USB composition does not support it.
* This function shall be called after the pipes were disconnected.
* Detailed description:
* - remove header-insertion headers from IPA core
* - delete the driver dependency defined for IPA resource manager and
* destroy the producer resource.
* - remove the debugfs entries
* - deregister the network interface from Linux network stack
* - free all internal data structs
*
* It is assumed that no packets shall be sent through HW bridging
* during cleanup to avoid packets trying to add an header that is
* removed during cleanup (IPA configuration manager should have
* removed them at this point)
*/
void rndis_ipa_cleanup(void *private)
{
struct rndis_ipa_dev *rndis_ipa_ctx = private;
int next_state;
int retval;
RNDIS_IPA_LOG_ENTRY();
RNDIS_IPA_DEBUG("private=0x%p\n", private);
if (!rndis_ipa_ctx) {
RNDIS_IPA_ERROR("rndis_ipa_ctx NULL pointer\n");
return;
}
next_state = rndis_ipa_next_state(rndis_ipa_ctx->state,
RNDIS_IPA_CLEANUP);
if (next_state == RNDIS_IPA_INVALID) {
RNDIS_IPA_ERROR("use disconnect()before clean()\n");
return;
}
RNDIS_IPA_STATE_DEBUG(rndis_ipa_ctx);
retval = rndis_ipa_deregister_properties(rndis_ipa_ctx->net->name);
if (retval) {
RNDIS_IPA_ERROR("Fail to deregister Tx/Rx properties\n");
return;
}
RNDIS_IPA_DEBUG("deregister Tx/Rx properties was successful\n");
retval = rndis_ipa_hdrs_destroy(rndis_ipa_ctx);
if (retval)
RNDIS_IPA_ERROR(
"Failed removing RNDIS headers from IPA core. Continue anyway\n");
else
RNDIS_IPA_DEBUG("RNDIS headers were removed from IPA core\n");
rndis_ipa_debugfs_destroy(rndis_ipa_ctx);
RNDIS_IPA_DEBUG("debugfs remove was done\n");
unregister_netdev(rndis_ipa_ctx->net);
RNDIS_IPA_DEBUG("netdev unregistered\n");
rndis_ipa_ctx->state = next_state;
free_netdev(rndis_ipa_ctx->net);
pr_info("RNDIS_IPA NetDev was cleaned\n");
RNDIS_IPA_LOG_EXIT();
return;
}
EXPORT_SYMBOL(rndis_ipa_cleanup);
static void rndis_ipa_enable_data_path(struct rndis_ipa_dev *rndis_ipa_ctx)
{
if (rndis_ipa_ctx->device_ready_notify) {
rndis_ipa_ctx->device_ready_notify();
RNDIS_IPA_DEBUG("USB device_ready_notify() was called\n");
} else {
RNDIS_IPA_DEBUG("device_ready_notify() not supplied\n");
}
netif_start_queue(rndis_ipa_ctx->net);
RNDIS_IPA_DEBUG("netif_start_queue() was called\n");
}
static void rndis_ipa_xmit_error(struct sk_buff *skb)
{
bool retval;
struct rndis_ipa_dev *rndis_ipa_ctx = netdev_priv(skb->dev);
unsigned long delay_jiffies;
u8 rand_dealy_msec;
RNDIS_IPA_LOG_ENTRY();
RNDIS_IPA_DEBUG("starting Tx-queue backoff\n");
netif_stop_queue(rndis_ipa_ctx->net);
RNDIS_IPA_DEBUG("netif_stop_queue was called\n");
skb_pull(skb, sizeof(rndis_template_hdr));
rndis_ipa_ctx->net->stats.tx_errors++;
get_random_bytes(&rand_dealy_msec, sizeof(rand_dealy_msec));
delay_jiffies = msecs_to_jiffies(
rndis_ipa_ctx->error_msec_sleep_time + rand_dealy_msec);
retval = schedule_delayed_work(
&rndis_ipa_ctx->xmit_error_delayed_work, delay_jiffies);
if (!retval) {
RNDIS_IPA_ERROR("fail to schedule delayed work\n");
netif_start_queue(rndis_ipa_ctx->net);
} else {
RNDIS_IPA_DEBUG("work scheduled to start Tx-queue in %d msec\n",
rndis_ipa_ctx->error_msec_sleep_time + rand_dealy_msec);
rndis_ipa_ctx->during_xmit_error = true;
}
RNDIS_IPA_LOG_EXIT();
}
static void rndis_ipa_xmit_error_aftercare_wq(struct work_struct *work)
{
struct rndis_ipa_dev *rndis_ipa_ctx;
struct delayed_work *delayed_work;
RNDIS_IPA_LOG_ENTRY();
RNDIS_IPA_DEBUG("Starting queue after xmit error\n");
delayed_work = to_delayed_work(work);
rndis_ipa_ctx = container_of(delayed_work, struct rndis_ipa_dev,
xmit_error_delayed_work);
if (unlikely(rndis_ipa_ctx->state != RNDIS_IPA_CONNECTED_AND_UP)) {
RNDIS_IPA_ERROR("error aftercare handling in bad state (%d)",
rndis_ipa_ctx->state);
return;
}
rndis_ipa_ctx->during_xmit_error = false;
netif_start_queue(rndis_ipa_ctx->net);
RNDIS_IPA_DEBUG("netif_start_queue() was called\n");
RNDIS_IPA_LOG_EXIT();
}
/**
* rndis_ipa_prepare_header_insertion() - prepare the header insertion request
* for IPA driver
* eth_type: the Ethernet type for this header-insertion header
* hdr_name: string that shall represent this header in IPA data base
* add_hdr: output for caller to be used with ipa_add_hdr() to configure
* the IPA core
* dst_mac: tethered PC MAC (Ethernet) address to be added to packets
* for IPA->USB pipe
* src_mac: device MAC (Ethernet) address to be added to packets
* for IPA->USB pipe
*
* This function shall build the header-insertion block request for a
* single Ethernet+RNDIS header)
* this header shall be inserted for packets processed by IPA
* and destined for USB client.
* This header shall be used for HW bridging for packets destined for
* tethered PC.
* For SW data-path, this header won't be used.
*/
static void rndis_ipa_prepare_header_insertion(int eth_type,
const char *hdr_name, struct ipa_hdr_add *add_hdr,
const void *dst_mac, const void *src_mac)
{
struct ethhdr *eth_hdr;
add_hdr->hdr_len = sizeof(rndis_template_hdr);
add_hdr->is_partial = false;
strlcpy(add_hdr->name, hdr_name, IPA_RESOURCE_NAME_MAX);
memcpy(add_hdr->hdr, &rndis_template_hdr, sizeof(rndis_template_hdr));
eth_hdr = (struct ethhdr *)(add_hdr->hdr + sizeof(rndis_template_hdr));
memcpy(eth_hdr->h_dest, dst_mac, ETH_ALEN);
memcpy(eth_hdr->h_source, src_mac, ETH_ALEN);
eth_hdr->h_proto = htons(eth_type);
add_hdr->hdr_len += ETH_HLEN;
add_hdr->is_eth2_ofst_valid = true;
add_hdr->eth2_ofst = sizeof(rndis_template_hdr);
add_hdr->type = IPA_HDR_L2_ETHERNET_II;
}
/**
* rndis_ipa_hdrs_cfg() - configure header insertion block in IPA core
* to allow HW bridging
* @rndis_ipa_ctx: main driver context
* @dst_mac: destination MAC address (tethered PC)
* @src_mac: source MAC address (MDM device)
*
* This function shall add 2 headers.
* One header for Ipv4 and one header for Ipv6.
* Both headers shall contain Ethernet header and RNDIS header, the only
* difference shall be in the EtherTye field.
* Headers will be committed to HW
*
* Returns negative errno, or zero on success
*/
static int rndis_ipa_hdrs_cfg(struct rndis_ipa_dev *rndis_ipa_ctx,
const void *dst_mac, const void *src_mac)
{
struct ipa_ioc_add_hdr *hdrs;
struct ipa_hdr_add *ipv4_hdr;
struct ipa_hdr_add *ipv6_hdr;
int result = 0;
RNDIS_IPA_LOG_ENTRY();
hdrs = kzalloc(sizeof(*hdrs) + sizeof(*ipv4_hdr) + sizeof(*ipv6_hdr),
GFP_KERNEL);
if (!hdrs) {
RNDIS_IPA_ERROR("mem allocation fail for header-insertion\n");
result = -ENOMEM;
goto fail_mem;
}
ipv4_hdr = &hdrs->hdr[0];
ipv6_hdr = &hdrs->hdr[1];
rndis_ipa_prepare_header_insertion(ETH_P_IP, IPV4_HDR_NAME,
ipv4_hdr, dst_mac, src_mac);
rndis_ipa_prepare_header_insertion(ETH_P_IPV6, IPV6_HDR_NAME,
ipv6_hdr, dst_mac, src_mac);
hdrs->commit = 1;
hdrs->num_hdrs = 2;
result = ipa_add_hdr(hdrs);
if (result) {
RNDIS_IPA_ERROR("Fail on Header-Insertion(%d)\n", result);
goto fail_add_hdr;
}
if (ipv4_hdr->status) {
RNDIS_IPA_ERROR("Fail on Header-Insertion ipv4(%d)\n",
ipv4_hdr->status);
result = ipv4_hdr->status;
goto fail_add_hdr;
}
if (ipv6_hdr->status) {
RNDIS_IPA_ERROR("Fail on Header-Insertion ipv6(%d)\n",
ipv6_hdr->status);
result = ipv6_hdr->status;
goto fail_add_hdr;
}
rndis_ipa_ctx->eth_ipv4_hdr_hdl = ipv4_hdr->hdr_hdl;
rndis_ipa_ctx->eth_ipv6_hdr_hdl = ipv6_hdr->hdr_hdl;
RNDIS_IPA_LOG_EXIT();
fail_add_hdr:
kfree(hdrs);
fail_mem:
return result;
}
/**
* rndis_ipa_hdrs_destroy() - remove the IPA core configuration done for
* the driver data path bridging.
* @rndis_ipa_ctx: the driver context
*
* Revert the work done on rndis_ipa_hdrs_cfg(), which is,
* remove 2 headers for Ethernet+RNDIS.
*/
static int rndis_ipa_hdrs_destroy(struct rndis_ipa_dev *rndis_ipa_ctx)
{
struct ipa_ioc_del_hdr *del_hdr;
struct ipa_hdr_del *ipv4;
struct ipa_hdr_del *ipv6;
int result;
del_hdr = kzalloc(sizeof(*del_hdr) + sizeof(*ipv4) +
sizeof(*ipv6), GFP_KERNEL);
if (!del_hdr) {
RNDIS_IPA_ERROR("memory allocation for del_hdr failed\n");
return -ENOMEM;
}
del_hdr->commit = 1;
del_hdr->num_hdls = 2;
ipv4 = &del_hdr->hdl[0];
ipv4->hdl = rndis_ipa_ctx->eth_ipv4_hdr_hdl;
ipv6 = &del_hdr->hdl[1];
ipv6->hdl = rndis_ipa_ctx->eth_ipv6_hdr_hdl;
result = ipa_del_hdr(del_hdr);
if (result || ipv4->status || ipv6->status)
RNDIS_IPA_ERROR("ipa_del_hdr failed\n");
else
RNDIS_IPA_DEBUG("hdrs deletion done\n");
kfree(del_hdr);
return result;
}
static struct net_device_stats *rndis_ipa_get_stats(struct net_device *net)
{
return &net->stats;
}
/**
* rndis_ipa_register_properties() - set Tx/Rx properties needed
* by IPA configuration manager
* @netdev_name: a string with the name of the network interface device
*
* Register Tx/Rx properties to allow user space configuration (IPA
* Configuration Manager):
*
* - Two Tx properties (IPA->USB): specify the header names and pipe number
* that shall be used by user space for header-addition configuration
* for ipv4/ipv6 packets flowing from IPA to USB for HW bridging data.
* That header-addition header is added by the Netdev and used by user
* space to close the the HW bridge by adding filtering and routing rules
* that point to this header.
*
* - Two Rx properties (USB->IPA): these properties shall be used by user space
* to configure the IPA core to identify the packets destined
* for Apps-processor by configuring the unicast rules destined for
* the Netdev IP address.
* This rules shall be added based on the attribute mask supplied at
* this function, that is, always hit rule.
*/
static int rndis_ipa_register_properties(char *netdev_name)
{
struct ipa_tx_intf tx_properties = {0};
struct ipa_ioc_tx_intf_prop properties[2] = { {0}, {0} };
struct ipa_ioc_tx_intf_prop *ipv4_property;
struct ipa_ioc_tx_intf_prop *ipv6_property;
struct ipa_ioc_rx_intf_prop rx_ioc_properties[2] = { {0}, {0} };
struct ipa_rx_intf rx_properties = {0};
struct ipa_ioc_rx_intf_prop *rx_ipv4_property;
struct ipa_ioc_rx_intf_prop *rx_ipv6_property;
int result = 0;
RNDIS_IPA_LOG_ENTRY();
tx_properties.prop = properties;
ipv4_property = &tx_properties.prop[0];
ipv4_property->ip = IPA_IP_v4;
ipv4_property->dst_pipe = IPA_TO_USB_CLIENT;
strlcpy(ipv4_property->hdr_name, IPV4_HDR_NAME,
IPA_RESOURCE_NAME_MAX);
ipv4_property->hdr_l2_type = IPA_HDR_L2_ETHERNET_II;
ipv6_property = &tx_properties.prop[1];
ipv6_property->ip = IPA_IP_v6;
ipv6_property->dst_pipe = IPA_TO_USB_CLIENT;
strlcpy(ipv6_property->hdr_name, IPV6_HDR_NAME,
IPA_RESOURCE_NAME_MAX);
ipv6_property->hdr_l2_type = IPA_HDR_L2_ETHERNET_II;
tx_properties.num_props = 2;
rx_properties.prop = rx_ioc_properties;
rx_ipv4_property = &rx_properties.prop[0];
rx_ipv4_property->ip = IPA_IP_v4;
rx_ipv4_property->attrib.attrib_mask = 0;
rx_ipv4_property->src_pipe = IPA_CLIENT_USB_PROD;
rx_ipv4_property->hdr_l2_type = IPA_HDR_L2_ETHERNET_II;
rx_ipv6_property = &rx_properties.prop[1];
rx_ipv6_property->ip = IPA_IP_v6;
rx_ipv6_property->attrib.attrib_mask = 0;
rx_ipv6_property->src_pipe = IPA_CLIENT_USB_PROD;
rx_ipv6_property->hdr_l2_type = IPA_HDR_L2_ETHERNET_II;
rx_properties.num_props = 2;
result = ipa_register_intf("rndis0", &tx_properties, &rx_properties);
if (result)
RNDIS_IPA_ERROR("fail on Tx/Rx properties registration\n");
else
RNDIS_IPA_DEBUG("Tx/Rx properties registration done\n");
RNDIS_IPA_LOG_EXIT();
return result;
}
/**
* rndis_ipa_deregister_properties() - remove the 2 Tx and 2 Rx properties
* @netdev_name: a string with the name of the network interface device
*
* This function revert the work done on rndis_ipa_register_properties().
*/
static int rndis_ipa_deregister_properties(char *netdev_name)
{
int result;
RNDIS_IPA_LOG_ENTRY();
result = ipa_deregister_intf(netdev_name);
if (result) {
RNDIS_IPA_DEBUG("Fail on Tx prop deregister\n");
return result;
}
RNDIS_IPA_LOG_EXIT();
return 0;
}
/**
* rndis_ipa_create_rm_resource() -creates the resource representing
* this Netdev and supply notification callback for resource event
* such as Grant/Release
* @rndis_ipa_ctx: this driver context
*
* In order make sure all needed resources are available during packet
* transmit this Netdev shall use Request/Release mechanism of
* the IPA resource manager.
* This mechanism shall iterate over a dependency graph and make sure
* all dependent entities are ready to for packet Tx
* transfer (Apps->IPA->USB).
* In this function the resource representing the Netdev is created
* in addition to the basic dependency between the Netdev and the USB client.
* Hence, USB client, is a dependency for the Netdev and may be notified in
* case of packet transmit from this Netdev to tethered Host.
* As implied from the "may" in the above sentence there is a scenario where
* the USB is not notified. This is done thanks to the IPA resource manager
* inactivity timer.
* The inactivity timer allow the Release requests to be delayed in order
* prevent ping-pong with the USB and other dependencies.
*/
static int rndis_ipa_create_rm_resource(struct rndis_ipa_dev *rndis_ipa_ctx)
{
struct ipa_rm_create_params create_params = {0};
struct ipa_rm_perf_profile profile;
int result;
RNDIS_IPA_LOG_ENTRY();
create_params.name = DRV_RESOURCE_ID;
create_params.reg_params.user_data = rndis_ipa_ctx;
create_params.reg_params.notify_cb = rndis_ipa_rm_notify;
result = ipa_rm_create_resource(&create_params);
if (result) {
RNDIS_IPA_ERROR("Fail on ipa_rm_create_resource\n");
goto fail_rm_create;
}
RNDIS_IPA_DEBUG("RM client was created\n");
profile.max_supported_bandwidth_mbps = IPA_APPS_MAX_BW_IN_MBPS;
ipa_rm_set_perf_profile(DRV_RESOURCE_ID, &profile);
result = ipa_rm_inactivity_timer_init(DRV_RESOURCE_ID,
INACTIVITY_MSEC_DELAY);
if (result) {
RNDIS_IPA_ERROR("Fail on ipa_rm_inactivity_timer_init\n");
goto fail_inactivity_timer;
}
RNDIS_IPA_DEBUG("rm_it client was created\n");
result = ipa_rm_add_dependency_sync(DRV_RESOURCE_ID,
IPA_RM_RESOURCE_USB_CONS);
if (result && result != -EINPROGRESS)
RNDIS_IPA_ERROR("unable to add RNDIS/USB dependency (%d)\n",
result);
else
RNDIS_IPA_DEBUG("RNDIS/USB dependency was set\n");
result = ipa_rm_add_dependency_sync(IPA_RM_RESOURCE_USB_PROD,
IPA_RM_RESOURCE_APPS_CONS);
if (result && result != -EINPROGRESS)
RNDIS_IPA_ERROR("unable to add USB/APPS dependency (%d)\n",
result);
else
RNDIS_IPA_DEBUG("USB/APPS dependency was set\n");
RNDIS_IPA_LOG_EXIT();
return 0;
fail_inactivity_timer:
fail_rm_create:
return result;
}
/**
* rndis_ipa_destroy_rm_resource() - delete the dependency and destroy
* the resource done on rndis_ipa_create_rm_resource()
* @rndis_ipa_ctx: this driver context
*
* This function shall delete the dependency create between
* the Netdev to the USB.
* In addition the inactivity time shall be destroy and the resource shall
* be deleted.
*/
static int rndis_ipa_destory_rm_resource(struct rndis_ipa_dev *rndis_ipa_ctx)
{
int result;
RNDIS_IPA_LOG_ENTRY();
result = ipa_rm_delete_dependency(DRV_RESOURCE_ID,
IPA_RM_RESOURCE_USB_CONS);
if (result && result != -EINPROGRESS) {
RNDIS_IPA_ERROR("Fail to delete RNDIS/USB dependency\n");
goto bail;
}
RNDIS_IPA_DEBUG("RNDIS/USB dependency was successfully deleted\n");
result = ipa_rm_delete_dependency(IPA_RM_RESOURCE_USB_PROD,
IPA_RM_RESOURCE_APPS_CONS);
if (result == -EINPROGRESS) {
RNDIS_IPA_DEBUG("RM dependency deletion is in progress");
} else if (result) {
RNDIS_IPA_ERROR("Fail to delete USB/APPS dependency\n");
goto bail;
} else {
RNDIS_IPA_DEBUG("USB/APPS dependency was deleted\n");
}
result = ipa_rm_inactivity_timer_destroy(DRV_RESOURCE_ID);
if (result) {
RNDIS_IPA_ERROR("Fail to destroy inactivity timern");
goto bail;
}
RNDIS_IPA_DEBUG("RM inactivity timer was successfully destroy\n");
result = ipa_rm_delete_resource(DRV_RESOURCE_ID);
if (result) {
RNDIS_IPA_ERROR("resource deletion failed\n");
goto bail;
}
RNDIS_IPA_DEBUG("Netdev RM resource was deleted (resid:%d)\n",
DRV_RESOURCE_ID);
RNDIS_IPA_LOG_EXIT();
bail:
return result;
}
/**
* resource_request() - request for the Netdev resource
* @rndis_ipa_ctx: main driver context
*
* This function shall send the IPA resource manager inactivity time a request
* to Grant the Netdev producer.
* In case the resource is already Granted the function shall return immediately
* and "pet" the inactivity timer.
* In case the resource was not already Granted this function shall
* return EINPROGRESS and the Netdev shall stop the send queue until
* the IPA resource manager notify it that the resource is
* granted (done in a differ context)
*/
static int resource_request(struct rndis_ipa_dev *rndis_ipa_ctx)
{
int result = 0;
if (!rm_enabled(rndis_ipa_ctx))
goto out;
result = ipa_rm_inactivity_timer_request_resource(
DRV_RESOURCE_ID);
out:
return result;
}
/**
* resource_release() - release the Netdev resource
* @rndis_ipa_ctx: main driver context
*
* start the inactivity timer count down.by using the IPA resource
* manager inactivity time.
* The actual resource release shall occur only if no request shall be done
* during the INACTIVITY_MSEC_DELAY.
*/
static void resource_release(struct rndis_ipa_dev *rndis_ipa_ctx)
{
if (!rm_enabled(rndis_ipa_ctx))
goto out;
ipa_rm_inactivity_timer_release_resource(DRV_RESOURCE_ID);
out:
return;
}
/**
* rndis_encapsulate_skb() - encapsulate the given Ethernet skb with
* an RNDIS header
* @skb: packet to be encapsulated with the RNDIS header
*
* Shall use a template header for RNDIS and update it with the given
* skb values.
* Ethernet is expected to be already encapsulate the packet.
*/
static struct sk_buff *rndis_encapsulate_skb(struct sk_buff *skb)
{
struct rndis_pkt_hdr *rndis_hdr;
int payload_byte_len = skb->len;
/* if there is no room in this skb, allocate a new one */
if (unlikely(skb_headroom(skb) < sizeof(rndis_template_hdr))) {
struct sk_buff *new_skb = skb_copy_expand(skb,
sizeof(rndis_template_hdr), 0, GFP_ATOMIC);
if (!new_skb) {
RNDIS_IPA_ERROR("no memory for skb expand\n");
return skb;
}
RNDIS_IPA_DEBUG("skb expanded. old %p new %p\n", skb, new_skb);
dev_kfree_skb_any(skb);
skb = new_skb;
}
/* make room at the head of the SKB to put the RNDIS header */
rndis_hdr = (struct rndis_pkt_hdr *)skb_push(skb,
sizeof(rndis_template_hdr));
memcpy(rndis_hdr, &rndis_template_hdr, sizeof(*rndis_hdr));
rndis_hdr->msg_len += payload_byte_len;
rndis_hdr->data_len += payload_byte_len;
return skb;
}
/**
* rx_filter() - logic that decide if the current skb is to be filtered out
* @skb: skb that may be sent up to the network stack
*
* This function shall do Rx packet filtering on the Netdev level.
*/
static bool rx_filter(struct sk_buff *skb)
{
struct rndis_ipa_dev *rndis_ipa_ctx = netdev_priv(skb->dev);
return rndis_ipa_ctx->rx_filter;
}
/**
* tx_filter() - logic that decide if the current skb is to be filtered out
* @skb: skb that may be sent to the USB core
*
* This function shall do Tx packet filtering on the Netdev level.
* ICMP filter bypass is possible to allow only ICMP packet to be
* sent (pings and etc)
*/
static bool tx_filter(struct sk_buff *skb)
{
struct rndis_ipa_dev *rndis_ipa_ctx = netdev_priv(skb->dev);
bool is_icmp;
if (likely(rndis_ipa_ctx->tx_filter == false))
return false;
is_icmp = (skb->protocol == htons(ETH_P_IP) &&
ip_hdr(skb)->protocol == IPPROTO_ICMP);
if ((rndis_ipa_ctx->icmp_filter == false) && is_icmp)
return false;
return true;
}
/**
* rm_enabled() - allow the use of resource manager Request/Release to
* be bypassed
* @rndis_ipa_ctx: main driver context
*
* By disabling the resource manager flag the Request for the Netdev resource
* shall be bypassed and the packet shall be sent.
* accordingly, Release request shall be bypass as well.
*/
static bool rm_enabled(struct rndis_ipa_dev *rndis_ipa_ctx)
{
return rndis_ipa_ctx->rm_enable;
}
/**
* rndis_ipa_ep_registers_cfg() - configure the USB endpoints
* @usb_to_ipa_hdl: handle received from ipa_connect which represents
* the USB to IPA end-point
* @ipa_to_usb_hdl: handle received from ipa_connect which represents
* the IPA to USB end-point
* @max_xfer_size_bytes_to_dev: the maximum size, in bytes, that the device
* expects to receive from the host. supplied on REMOTE_NDIS_INITIALIZE_CMPLT.
* @max_xfer_size_bytes_to_host: the maximum size, in bytes, that the host
* expects to receive from the device. supplied on REMOTE_NDIS_INITIALIZE_MSG.
* @mtu: the netdev MTU size, in bytes
*
* USB to IPA pipe:
* - de-aggregation
* - Remove Ethernet header
* - Remove RNDIS header
* - SRC NAT
* - Default routing(0)
* IPA to USB Pipe:
* - aggregation
* - Add Ethernet header
* - Add RNDIS header
*/
static int rndis_ipa_ep_registers_cfg(u32 usb_to_ipa_hdl,
u32 ipa_to_usb_hdl,
u32 max_xfer_size_bytes_to_dev,
u32 max_xfer_size_bytes_to_host,
u32 mtu,
bool deaggr_enable)
{
int result;
struct ipa_ep_cfg *usb_to_ipa_ep_cfg;
if (deaggr_enable) {
usb_to_ipa_ep_cfg = &usb_to_ipa_ep_cfg_deaggr_en;
RNDIS_IPA_DEBUG("deaggregation enabled\n");
} else {
usb_to_ipa_ep_cfg = &usb_to_ipa_ep_cfg_deaggr_dis;
RNDIS_IPA_DEBUG("deaggregation disabled\n");
}
usb_to_ipa_ep_cfg->deaggr.max_packet_len = max_xfer_size_bytes_to_dev;
result = ipa_cfg_ep(usb_to_ipa_hdl, usb_to_ipa_ep_cfg);
if (result) {
pr_err("failed to configure USB to IPA point\n");
return result;
}
RNDIS_IPA_DEBUG("IPA<-USB end-point configured\n");
ipa_to_usb_ep_cfg.aggr.aggr_byte_limit =
(max_xfer_size_bytes_to_host - mtu)/1024;
if (ipa_to_usb_ep_cfg.aggr.aggr_byte_limit == 0) {
ipa_to_usb_ep_cfg.aggr.aggr_time_limit = 0;
ipa_to_usb_ep_cfg.aggr.aggr_pkt_limit = 1;
} else {
ipa_to_usb_ep_cfg.aggr.aggr_time_limit =
DEFAULT_AGGR_TIME_LIMIT;
ipa_to_usb_ep_cfg.aggr.aggr_pkt_limit =
DEFAULT_AGGR_PKT_LIMIT;
}
RNDIS_IPA_DEBUG("RNDIS aggregation param:"
" en=%d"
" byte_limit=%d"
" time_limit=%d"
" pkt_limit=%d\n",
ipa_to_usb_ep_cfg.aggr.aggr_en,
ipa_to_usb_ep_cfg.aggr.aggr_byte_limit,
ipa_to_usb_ep_cfg.aggr.aggr_time_limit,
ipa_to_usb_ep_cfg.aggr.aggr_pkt_limit);
result = ipa_cfg_ep(ipa_to_usb_hdl, &ipa_to_usb_ep_cfg);
if (result) {
pr_err("failed to configure IPA to USB end-point\n");
return result;
}
RNDIS_IPA_DEBUG("IPA->USB end-point configured\n");
return 0;
}
/**
* rndis_ipa_set_device_ethernet_addr() - set device Ethernet address
* @dev_ethaddr: device Ethernet address
*
* Returns 0 for success, negative otherwise
*/
static int rndis_ipa_set_device_ethernet_addr(u8 *dev_ethaddr,
u8 device_ethaddr[])
{
if (!is_valid_ether_addr(device_ethaddr))
return -EINVAL;
memcpy(dev_ethaddr, device_ethaddr, ETH_ALEN);
return 0;
}
/** rndis_ipa_next_state - return the next state of the driver
* @current_state: the current state of the driver
* @operation: an enum which represent the operation being made on the driver
* by its API.
*
* This function implements the driver internal state machine.
* Its decisions are based on the driver current state and the operation
* being made.
* In case the operation is invalid this state machine will return
* the value RNDIS_IPA_INVALID to inform the caller for a forbidden sequence.
*/
static enum rndis_ipa_state rndis_ipa_next_state(
enum rndis_ipa_state current_state,
enum rndis_ipa_operation operation)
{
int next_state = RNDIS_IPA_INVALID;
switch (current_state) {
case RNDIS_IPA_UNLOADED:
if (operation == RNDIS_IPA_INITIALIZE)
next_state = RNDIS_IPA_INITIALIZED;
break;
case RNDIS_IPA_INITIALIZED:
if (operation == RNDIS_IPA_CONNECT)
next_state = RNDIS_IPA_CONNECTED;
else if (operation == RNDIS_IPA_OPEN)
next_state = RNDIS_IPA_UP;
else if (operation == RNDIS_IPA_CLEANUP)
next_state = RNDIS_IPA_UNLOADED;
break;
case RNDIS_IPA_CONNECTED:
if (operation == RNDIS_IPA_DISCONNECT)
next_state = RNDIS_IPA_INITIALIZED;
else if (operation == RNDIS_IPA_OPEN)
next_state = RNDIS_IPA_CONNECTED_AND_UP;
break;
case RNDIS_IPA_UP:
if (operation == RNDIS_IPA_STOP)
next_state = RNDIS_IPA_INITIALIZED;
else if (operation == RNDIS_IPA_CONNECT)
next_state = RNDIS_IPA_CONNECTED_AND_UP;
else if (operation == RNDIS_IPA_CLEANUP)
next_state = RNDIS_IPA_UNLOADED;
break;
case RNDIS_IPA_CONNECTED_AND_UP:
if (operation == RNDIS_IPA_STOP)
next_state = RNDIS_IPA_CONNECTED;
else if (operation == RNDIS_IPA_DISCONNECT)
next_state = RNDIS_IPA_UP;
break;
default:
RNDIS_IPA_ERROR("State is not supported\n");
WARN_ON(true);
break;
}
RNDIS_IPA_DEBUG("state transition ( %s -> %s )- %s\n",
rndis_ipa_state_string(current_state),
rndis_ipa_state_string(next_state) ,
next_state == RNDIS_IPA_INVALID ?
"Forbidden" : "Allowed");
return next_state;
}
/**
* rndis_ipa_state_string - return the state string representation
* @state: enum which describe the state
*/
static const char *rndis_ipa_state_string(enum rndis_ipa_state state)
{
switch (state) {
case RNDIS_IPA_UNLOADED:
return "RNDIS_IPA_UNLOADED";
case RNDIS_IPA_INITIALIZED:
return "RNDIS_IPA_INITIALIZED";
case RNDIS_IPA_CONNECTED:
return "RNDIS_IPA_CONNECTED";
case RNDIS_IPA_UP:
return "RNDIS_IPA_UP";
case RNDIS_IPA_CONNECTED_AND_UP:
return "RNDIS_IPA_CONNECTED_AND_UP";
default:
return "Not supported";
}
}
static void rndis_ipa_dump_skb(struct sk_buff *skb)
{
int i;
u32 *cur = (u32 *)skb->data;
u8 *byte;
RNDIS_IPA_DEBUG("packet dump start for skb->len=%d\n",
skb->len);
for (i = 0; i < (skb->len/4); i++) {
byte = (u8 *)(cur + i);
pr_info("%2d %08x %02x %02x %02x %02x\n",
i, *(cur + i),
byte[0], byte[1], byte[2], byte[3]);
}
RNDIS_IPA_DEBUG("packet dump ended for skb->len=%d\n",
skb->len);
}
/**
* Creates the root folder for the driver
*/
static int rndis_ipa_debugfs_init(struct rndis_ipa_dev *rndis_ipa_ctx)
{
const mode_t flags_read_write = S_IRUGO | S_IWUGO;
const mode_t flags_read_only = S_IRUGO;
const mode_t flags_write_only = S_IWUGO;
struct dentry *file;
struct dentry *aggr_directory;
RNDIS_IPA_LOG_ENTRY();
if (!rndis_ipa_ctx)
return -EINVAL;
rndis_ipa_ctx->directory = debugfs_create_dir(DEBUGFS_DIR_NAME, NULL);
if (!rndis_ipa_ctx->directory) {
RNDIS_IPA_ERROR("could not create debugfs directory entry\n");
goto fail_directory;
}
file = debugfs_create_bool("tx_filter", flags_read_write,
rndis_ipa_ctx->directory, &rndis_ipa_ctx->tx_filter);
if (!file) {
RNDIS_IPA_ERROR("could not create debugfs tx_filter file\n");
goto fail_file;
}
file = debugfs_create_bool("rx_filter", flags_read_write,
rndis_ipa_ctx->directory, &rndis_ipa_ctx->rx_filter);
if (!file) {
RNDIS_IPA_ERROR("could not create debugfs rx_filter file\n");
goto fail_file;
}
file = debugfs_create_bool("icmp_filter", flags_read_write,
rndis_ipa_ctx->directory, &rndis_ipa_ctx->icmp_filter);
if (!file) {
RNDIS_IPA_ERROR("could not create debugfs icmp_filter file\n");
goto fail_file;
}
file = debugfs_create_bool("rm_enable", flags_read_write,
rndis_ipa_ctx->directory, &rndis_ipa_ctx->rm_enable);
if (!file) {
RNDIS_IPA_ERROR("could not create debugfs rm file\n");
goto fail_file;
}
file = debugfs_create_u32("outstanding_high", flags_read_write,
rndis_ipa_ctx->directory,
&rndis_ipa_ctx->outstanding_high);
if (!file) {
RNDIS_IPA_ERROR("could not create outstanding_high file\n");
goto fail_file;
}
file = debugfs_create_u32("outstanding_low", flags_read_write,
rndis_ipa_ctx->directory,
&rndis_ipa_ctx->outstanding_low);
if (!file) {
RNDIS_IPA_ERROR("could not create outstanding_low file\n");
goto fail_file;
}
file = debugfs_create_file("outstanding", flags_read_only,
rndis_ipa_ctx->directory,
rndis_ipa_ctx, &rndis_ipa_debugfs_atomic_ops);
if (!file) {
RNDIS_IPA_ERROR("could not create outstanding file\n");
goto fail_file;
}
file = debugfs_create_file("loopback_enable", flags_read_write,
rndis_ipa_ctx->directory,
rndis_ipa_ctx, &rndis_ipa_loopback_ops);
if (!file) {
RNDIS_IPA_ERROR("could not create outstanding file\n");
goto fail_file;
}
file = debugfs_create_u8("state", flags_read_only,
rndis_ipa_ctx->directory, (u8 *)&rndis_ipa_ctx->state);
if (!file) {
RNDIS_IPA_ERROR("could not create state file\n");
goto fail_file;
}
file = debugfs_create_u32("tx_dropped", flags_read_only,
rndis_ipa_ctx->directory, &rndis_ipa_ctx->tx_dropped);
if (!file) {
RNDIS_IPA_ERROR("could not create tx_dropped file\n");
goto fail_file;
}
file = debugfs_create_u32("rx_dropped", flags_read_only,
rndis_ipa_ctx->directory, &rndis_ipa_ctx->rx_dropped);
if (!file) {
RNDIS_IPA_ERROR("could not create rx_dropped file\n");
goto fail_file;
}
aggr_directory = debugfs_create_dir(DEBUGFS_AGGR_DIR_NAME,
rndis_ipa_ctx->directory);
if (!aggr_directory) {
RNDIS_IPA_ERROR("could not create debugfs aggr entry\n");
goto fail_directory;
}
file = debugfs_create_file("aggr_value_set", flags_write_only,
aggr_directory,
rndis_ipa_ctx, &rndis_ipa_aggr_ops);
if (!file) {
RNDIS_IPA_ERROR("could not create aggr_value_set file\n");
goto fail_file;
}
file = debugfs_create_u8("aggr_enable", flags_read_write,
aggr_directory, (u8 *)&ipa_to_usb_ep_cfg.aggr.aggr_en);
if (!file) {
RNDIS_IPA_ERROR("could not create aggr_enable file\n");
goto fail_file;
}
file = debugfs_create_u8("aggr_type", flags_read_write,
aggr_directory, (u8 *)&ipa_to_usb_ep_cfg.aggr.aggr);
if (!file) {
RNDIS_IPA_ERROR("could not create aggr_type file\n");
goto fail_file;
}
file = debugfs_create_u32("aggr_byte_limit", flags_read_write,
aggr_directory,
&ipa_to_usb_ep_cfg.aggr.aggr_byte_limit);
if (!file) {
RNDIS_IPA_ERROR("could not create aggr_byte_limit file\n");
goto fail_file;
}
file = debugfs_create_u32("aggr_time_limit", flags_read_write,
aggr_directory,
&ipa_to_usb_ep_cfg.aggr.aggr_time_limit);
if (!file) {
RNDIS_IPA_ERROR("could not create aggr_time_limit file\n");
goto fail_file;
}
file = debugfs_create_u32("aggr_pkt_limit", flags_read_write,
aggr_directory,
&ipa_to_usb_ep_cfg.aggr.aggr_pkt_limit);
if (!file) {
RNDIS_IPA_ERROR("could not create aggr_pkt_limit file\n");
goto fail_file;
}
file = debugfs_create_bool("tx_dump_enable", flags_read_write,
rndis_ipa_ctx->directory,
&rndis_ipa_ctx->tx_dump_enable);
if (!file) {
RNDIS_IPA_ERROR("fail to create tx_dump_enable file\n");
goto fail_file;
}
file = debugfs_create_bool("rx_dump_enable", flags_read_write,
rndis_ipa_ctx->directory,
&rndis_ipa_ctx->rx_dump_enable);
if (!file) {
RNDIS_IPA_ERROR("fail to create rx_dump_enable file\n");
goto fail_file;
}
file = debugfs_create_bool("deaggregation_enable", flags_read_write,
rndis_ipa_ctx->directory,
&rndis_ipa_ctx->deaggregation_enable);
if (!file) {
RNDIS_IPA_ERROR("fail to create deaggregation_enable file\n");
goto fail_file;
}
file = debugfs_create_u32("error_msec_sleep_time", flags_read_write,
rndis_ipa_ctx->directory,
&rndis_ipa_ctx->error_msec_sleep_time);
if (!file) {
RNDIS_IPA_ERROR("fail to create error_msec_sleep_time file\n");
goto fail_file;
}
file = debugfs_create_bool("during_xmit_error", flags_read_only,
rndis_ipa_ctx->directory,
&rndis_ipa_ctx->during_xmit_error);
if (!file) {
RNDIS_IPA_ERROR("fail to create during_xmit_error file\n");
goto fail_file;
}
RNDIS_IPA_LOG_EXIT();
return 0;
fail_file:
debugfs_remove_recursive(rndis_ipa_ctx->directory);
fail_directory:
return -EFAULT;
}
static void rndis_ipa_debugfs_destroy(struct rndis_ipa_dev *rndis_ipa_ctx)
{
debugfs_remove_recursive(rndis_ipa_ctx->directory);
}
static int rndis_ipa_debugfs_aggr_open(struct inode *inode,
struct file *file)
{
struct rndis_ipa_dev *rndis_ipa_ctx = inode->i_private;
file->private_data = rndis_ipa_ctx;
return 0;
}
static ssize_t rndis_ipa_debugfs_aggr_write(struct file *file,
const char __user *buf, size_t count, loff_t *ppos)
{
struct rndis_ipa_dev *rndis_ipa_ctx = file->private_data;
int result;
result = ipa_cfg_ep(rndis_ipa_ctx->usb_to_ipa_hdl, &ipa_to_usb_ep_cfg);
if (result) {
pr_err("failed to re-configure USB to IPA point\n");
return result;
}
pr_info("IPA<-USB end-point re-configured\n");
return count;
}
static int rndis_ipa_debugfs_loopback_open(struct inode *inode,
struct file *file)
{
struct rndis_ipa_dev *rndis_ipa_ctx = inode->i_private;
file->private_data = rndis_ipa_ctx;
return 0;
}
static ssize_t rndis_ipa_debugfs_loopback_read(struct file *file,
char __user *ubuf, size_t count, loff_t *ppos)
{
int cnt;
struct rndis_ipa_dev *rndis_ipa_ctx = file->private_data;
file->private_data = &rndis_ipa_ctx->loopback_enable;
cnt = rndis_ipa_debugfs_enable_read(file,
ubuf, count, ppos);
return cnt;
}
static ssize_t rndis_ipa_debugfs_loopback_write(struct file *file,
const char __user *buf, size_t count, loff_t *ppos)
{
int retval;
int cnt;
struct rndis_ipa_dev *rndis_ipa_ctx = file->private_data;
bool old_state = rndis_ipa_ctx->loopback_enable;
file->private_data = &rndis_ipa_ctx->loopback_enable;
cnt = rndis_ipa_debugfs_enable_write(file,
buf, count, ppos);
RNDIS_IPA_DEBUG("loopback_enable was set to:%d->%d\n",
old_state, rndis_ipa_ctx->loopback_enable);
if (old_state == rndis_ipa_ctx->loopback_enable) {
RNDIS_IPA_ERROR("NOP - same state\n");
return cnt;
}
retval = rndis_ipa_setup_loopback(
rndis_ipa_ctx->loopback_enable,
rndis_ipa_ctx);
if (retval)
rndis_ipa_ctx->loopback_enable = old_state;
return cnt;
}
static int rndis_ipa_debugfs_atomic_open(struct inode *inode, struct file *file)
{
struct rndis_ipa_dev *rndis_ipa_ctx = inode->i_private;
RNDIS_IPA_LOG_ENTRY();
file->private_data = &(rndis_ipa_ctx->outstanding_pkts);
RNDIS_IPA_LOG_EXIT();
return 0;
}
static ssize_t rndis_ipa_debugfs_atomic_read(struct file *file,
char __user *ubuf, size_t count, loff_t *ppos)
{
int nbytes;
u8 atomic_str[DEBUGFS_TEMP_BUF_SIZE] = {0};
atomic_t *atomic_var = file->private_data;
RNDIS_IPA_LOG_ENTRY();
nbytes = scnprintf(atomic_str, sizeof(atomic_str), "%d\n",
atomic_read(atomic_var));
RNDIS_IPA_LOG_EXIT();
return simple_read_from_buffer(ubuf, count, ppos, atomic_str, nbytes);
}
static ssize_t rndis_ipa_debugfs_enable_read(struct file *file,
char __user *ubuf, size_t count, loff_t *ppos)
{
int nbytes;
int size = 0;
int ret;
loff_t pos;
u8 enable_str[sizeof(char)*3] = {0};
bool *enable = file->private_data;
pos = *ppos;
nbytes = scnprintf(enable_str, sizeof(enable_str), "%d\n", *enable);
ret = simple_read_from_buffer(ubuf, count, ppos, enable_str, nbytes);
if (ret < 0) {
RNDIS_IPA_ERROR("simple_read_from_buffer problem\n");
return ret;
}
size += ret;
count -= nbytes;
*ppos = pos + size;
return size;
}
static ssize_t rndis_ipa_debugfs_enable_write(struct file *file,
const char __user *buf, size_t count, loff_t *ppos)
{
unsigned long missing;
char input;
bool *enable = file->private_data;
if (count != sizeof(input) + 1) {
RNDIS_IPA_ERROR("wrong input length(%zd)\n", count);
return -EINVAL;
}
if (!buf) {
RNDIS_IPA_ERROR("Bad argument\n");
return -EINVAL;
}
missing = copy_from_user(&input, buf, 1);
if (missing)
return -EFAULT;
RNDIS_IPA_DEBUG("input received %c\n", input);
*enable = input - '0';
RNDIS_IPA_DEBUG("value was set to %d\n", *enable);
return count;
}
/**
* Connects IPA->BAMDMA
* This shall simulate the path from IPA to USB
* Allowing the driver TX path
*/
static int rndis_ipa_loopback_pipe_create(
struct rndis_ipa_dev *rndis_ipa_ctx,
struct rndis_loopback_pipe *loopback_pipe)
{
int retval;
RNDIS_IPA_LOG_ENTRY();
/* SPS pipe has two side handshake
* This is the first handshake of IPA->BAMDMA,
* This is the IPA side
*/
loopback_pipe->ipa_connect_params.client = loopback_pipe->ipa_client;
loopback_pipe->ipa_connect_params.client_bam_hdl =
rndis_ipa_ctx->bam_dma_hdl;
loopback_pipe->ipa_connect_params.client_ep_idx =
loopback_pipe->peer_pipe_index;
loopback_pipe->ipa_connect_params.desc_fifo_sz = BAM_DMA_DESC_FIFO_SIZE;
loopback_pipe->ipa_connect_params.data_fifo_sz = BAM_DMA_DATA_FIFO_SIZE;
loopback_pipe->ipa_connect_params.notify = loopback_pipe->ipa_callback;
loopback_pipe->ipa_connect_params.priv = rndis_ipa_ctx;
loopback_pipe->ipa_connect_params.ipa_ep_cfg =
*(loopback_pipe->ipa_ep_cfg);
/* loopback_pipe->ipa_sps_connect is out param */
retval = ipa_connect(&loopback_pipe->ipa_connect_params,
&loopback_pipe->ipa_sps_connect,
&loopback_pipe->ipa_drv_ep_hdl);
if (retval) {
RNDIS_IPA_ERROR("ipa_connect() fail (%d)", retval);
return retval;
}
RNDIS_IPA_DEBUG("ipa_connect() succeeded, ipa_drv_ep_hdl=%d",
loopback_pipe->ipa_drv_ep_hdl);
/* SPS pipe has two side handshake
* This is the second handshake of IPA->BAMDMA,
* This is the BAMDMA side
*/
loopback_pipe->dma_sps = sps_alloc_endpoint();
if (!loopback_pipe->dma_sps) {
RNDIS_IPA_ERROR("sps_alloc_endpoint() failed ");
retval = -ENOMEM;
goto fail_sps_alloc;
}
retval = sps_get_config(loopback_pipe->dma_sps,
&loopback_pipe->dma_connect);
if (retval) {
RNDIS_IPA_ERROR("sps_get_config() failed (%d)", retval);
goto fail_get_cfg;
}
/* Start setting the non IPA ep for SPS driver*/
loopback_pipe->dma_connect.mode = loopback_pipe->mode;
/* SPS_MODE_DEST: DMA end point is the dest (consumer) IPA->DMA */
if (loopback_pipe->mode == SPS_MODE_DEST) {
loopback_pipe->dma_connect.source =
loopback_pipe->ipa_sps_connect.ipa_bam_hdl;
loopback_pipe->dma_connect.src_pipe_index =
loopback_pipe->ipa_sps_connect.ipa_ep_idx;
loopback_pipe->dma_connect.destination =
rndis_ipa_ctx->bam_dma_hdl;
loopback_pipe->dma_connect.dest_pipe_index =
loopback_pipe->peer_pipe_index;
/* SPS_MODE_SRC: DMA end point is the source (producer) DMA->IPA */
} else {
loopback_pipe->dma_connect.source =
rndis_ipa_ctx->bam_dma_hdl;
loopback_pipe->dma_connect.src_pipe_index =
loopback_pipe->peer_pipe_index;
loopback_pipe->dma_connect.destination =
loopback_pipe->ipa_sps_connect.ipa_bam_hdl;
loopback_pipe->dma_connect.dest_pipe_index =
loopback_pipe->ipa_sps_connect.ipa_ep_idx;
}
loopback_pipe->dma_connect.desc = loopback_pipe->ipa_sps_connect.desc;
loopback_pipe->dma_connect.data = loopback_pipe->ipa_sps_connect.data;
loopback_pipe->dma_connect.event_thresh = 0x10;
/* BAM-to-BAM */
loopback_pipe->dma_connect.options = SPS_O_AUTO_ENABLE;
RNDIS_IPA_DEBUG("doing sps_connect() with - ");
RNDIS_IPA_DEBUG("src bam_hdl:0x%lx, src_pipe#:%d",
loopback_pipe->dma_connect.source,
loopback_pipe->dma_connect.src_pipe_index);
RNDIS_IPA_DEBUG("dst bam_hdl:0x%lx, dst_pipe#:%d",
loopback_pipe->dma_connect.destination,
loopback_pipe->dma_connect.dest_pipe_index);
retval = sps_connect(loopback_pipe->dma_sps,
&loopback_pipe->dma_connect);
if (retval) {
RNDIS_IPA_ERROR("sps_connect() fail for BAMDMA side (%d)",
retval);
goto fail_sps_connect;
}
RNDIS_IPA_LOG_EXIT();
return 0;
fail_sps_connect:
fail_get_cfg:
sps_free_endpoint(loopback_pipe->dma_sps);
fail_sps_alloc:
ipa_disconnect(loopback_pipe->ipa_drv_ep_hdl);
return retval;
}
static void rndis_ipa_destroy_loopback_pipe(
struct rndis_loopback_pipe *loopback_pipe)
{
sps_disconnect(loopback_pipe->dma_sps);
sps_free_endpoint(loopback_pipe->dma_sps);
}
/**
* rndis_ipa_create_loopback() - create a BAM-DMA loopback
* in order to replace the USB core
*/
static int rndis_ipa_create_loopback(struct rndis_ipa_dev *rndis_ipa_ctx)
{
/* The BAM handle should be use as
* source/destination in the sps_connect()
*/
int retval;
RNDIS_IPA_LOG_ENTRY();
retval = sps_ctrl_bam_dma_clk(true);
if (retval) {
RNDIS_IPA_ERROR("fail on enabling BAM-DMA clocks");
return -ENODEV;
}
/* Get BAM handle instead of USB handle */
rndis_ipa_ctx->bam_dma_hdl = sps_dma_get_bam_handle();
if (!rndis_ipa_ctx->bam_dma_hdl) {
RNDIS_IPA_ERROR("sps_dma_get_bam_handle() failed");
return -ENODEV;
}
RNDIS_IPA_DEBUG("sps_dma_get_bam_handle() succeeded (0x%x)",
rndis_ipa_ctx->bam_dma_hdl);
/* IPA<-BAMDMA, NetDev Rx path (BAMDMA is the USB stub) */
rndis_ipa_ctx->usb_to_ipa_loopback_pipe.ipa_client =
IPA_CLIENT_USB_PROD;
rndis_ipa_ctx->usb_to_ipa_loopback_pipe.peer_pipe_index =
FROM_USB_TO_IPA_BAMDMA;
/*DMA EP mode*/
rndis_ipa_ctx->usb_to_ipa_loopback_pipe.mode = SPS_MODE_SRC;
rndis_ipa_ctx->usb_to_ipa_loopback_pipe.ipa_ep_cfg =
&usb_to_ipa_ep_cfg_deaggr_en;
rndis_ipa_ctx->usb_to_ipa_loopback_pipe.ipa_callback =
rndis_ipa_packet_receive_notify;
RNDIS_IPA_DEBUG("setting up IPA<-BAMDAM pipe (RNDIS_IPA RX path)");
retval = rndis_ipa_loopback_pipe_create(rndis_ipa_ctx,
&rndis_ipa_ctx->usb_to_ipa_loopback_pipe);
if (retval) {
RNDIS_IPA_ERROR("fail to close IPA->BAMDAM pipe");
goto fail_to_usb;
}
RNDIS_IPA_DEBUG("IPA->BAMDAM pipe successfully connected (TX path)");
/* IPA->BAMDMA, NetDev Tx path (BAMDMA is the USB stub)*/
rndis_ipa_ctx->ipa_to_usb_loopback_pipe.ipa_client =
IPA_CLIENT_USB_CONS;
/*DMA EP mode*/
rndis_ipa_ctx->ipa_to_usb_loopback_pipe.mode = SPS_MODE_DEST;
rndis_ipa_ctx->ipa_to_usb_loopback_pipe.ipa_ep_cfg = &ipa_to_usb_ep_cfg;
rndis_ipa_ctx->ipa_to_usb_loopback_pipe.peer_pipe_index =
FROM_IPA_TO_USB_BAMDMA;
rndis_ipa_ctx->ipa_to_usb_loopback_pipe.ipa_callback =
rndis_ipa_tx_complete_notify;
RNDIS_IPA_DEBUG("setting up IPA->BAMDAM pipe (RNDIS_IPA TX path)");
retval = rndis_ipa_loopback_pipe_create(rndis_ipa_ctx,
&rndis_ipa_ctx->ipa_to_usb_loopback_pipe);
if (retval) {
RNDIS_IPA_ERROR("fail to close IPA<-BAMDAM pipe");
goto fail_from_usb;
}
RNDIS_IPA_DEBUG("IPA<-BAMDAM pipe successfully connected(RX path)");
RNDIS_IPA_LOG_EXIT();
return 0;
fail_from_usb:
rndis_ipa_destroy_loopback_pipe(
&rndis_ipa_ctx->usb_to_ipa_loopback_pipe);
fail_to_usb:
return retval;
}
static void rndis_ipa_destroy_loopback(struct rndis_ipa_dev *rndis_ipa_ctx)
{
rndis_ipa_destroy_loopback_pipe(
&rndis_ipa_ctx->ipa_to_usb_loopback_pipe);
rndis_ipa_destroy_loopback_pipe(
&rndis_ipa_ctx->usb_to_ipa_loopback_pipe);
sps_dma_free_bam_handle(rndis_ipa_ctx->bam_dma_hdl);
if (sps_ctrl_bam_dma_clk(false))
RNDIS_IPA_ERROR("fail to disable BAM-DMA clocks");
}
/**
* rndis_ipa_setup_loopback() - create/destroy a loopback on IPA HW
* (as USB pipes loopback) and notify RNDIS_IPA netdev for pipe connected
* @enable: flag that determines if the loopback should be created or destroyed
* @rndis_ipa_ctx: driver main context
*
* This function is the main loopback logic.
* It shall create/destory the loopback by using BAM-DMA and notify
* the netdev accordingly.
*/
static int rndis_ipa_setup_loopback(bool enable,
struct rndis_ipa_dev *rndis_ipa_ctx)
{
int retval;
if (!enable) {
rndis_ipa_destroy_loopback(rndis_ipa_ctx);
RNDIS_IPA_DEBUG("loopback destroy done");
retval = rndis_ipa_pipe_disconnect_notify(rndis_ipa_ctx);
if (retval) {
RNDIS_IPA_ERROR("connect notify fail");
return -ENODEV;
}
return 0;
}
RNDIS_IPA_DEBUG("creating loopback (instead of USB core)");
retval = rndis_ipa_create_loopback(rndis_ipa_ctx);
RNDIS_IPA_DEBUG("creating loopback- %s", (retval ? "FAIL" : "OK"));
if (retval) {
RNDIS_IPA_ERROR("Fail to connect loopback");
return -ENODEV;
}
retval = rndis_ipa_pipe_connect_notify(
rndis_ipa_ctx->usb_to_ipa_loopback_pipe.ipa_drv_ep_hdl,
rndis_ipa_ctx->ipa_to_usb_loopback_pipe.ipa_drv_ep_hdl,
BAM_DMA_DATA_FIFO_SIZE,
15,
BAM_DMA_DATA_FIFO_SIZE - rndis_ipa_ctx->net->mtu,
rndis_ipa_ctx);
if (retval) {
RNDIS_IPA_ERROR("connect notify fail");
return -ENODEV;
}
return 0;
}
static int rndis_ipa_init_module(void)
{
pr_info("RNDIS_IPA module is loaded.");
return 0;
}
static void rndis_ipa_cleanup_module(void)
{
pr_info("RNDIS_IPA module is unloaded.");
return;
}
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("RNDIS_IPA network interface");
late_initcall(rndis_ipa_init_module);
module_exit(rndis_ipa_cleanup_module);
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