diff options
Diffstat (limited to 'drivers/net/wwan/iosm/iosm_ipc_mux.h')
| -rw-r--r-- | drivers/net/wwan/iosm/iosm_ipc_mux.h | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/drivers/net/wwan/iosm/iosm_ipc_mux.h b/drivers/net/wwan/iosm/iosm_ipc_mux.h new file mode 100644 index 000000000000..ddd2cd0bd911 --- /dev/null +++ b/drivers/net/wwan/iosm/iosm_ipc_mux.h @@ -0,0 +1,343 @@ +/* SPDX-License-Identifier: GPL-2.0-only + * + * Copyright (C) 2020-21 Intel Corporation. + */ + +#ifndef IOSM_IPC_MUX_H +#define IOSM_IPC_MUX_H + +#include "iosm_ipc_protocol.h" + +/* Size of the buffer for the IP MUX data buffer. */ +#define IPC_MEM_MAX_DL_MUX_BUF_SIZE (16 * 1024) +#define IPC_MEM_MAX_UL_ADB_BUF_SIZE IPC_MEM_MAX_DL_MUX_BUF_SIZE + +/* Size of the buffer for the IP MUX Lite data buffer. */ +#define IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE (2 * 1024) + +/* TD counts for IP MUX Lite */ +#define IPC_MEM_MAX_TDS_MUX_LITE_UL 800 +#define IPC_MEM_MAX_TDS_MUX_LITE_DL 1200 + +/* open session request (AP->CP) */ +#define MUX_CMD_OPEN_SESSION 1 + +/* response to open session request (CP->AP) */ +#define MUX_CMD_OPEN_SESSION_RESP 2 + +/* close session request (AP->CP) */ +#define MUX_CMD_CLOSE_SESSION 3 + +/* response to close session request (CP->AP) */ +#define MUX_CMD_CLOSE_SESSION_RESP 4 + +/* Flow control command with mask of the flow per queue/flow. */ +#define MUX_LITE_CMD_FLOW_CTL 5 + +/* ACK the flow control command. Shall have the same Transaction ID as the + * matching FLOW_CTL command. + */ +#define MUX_LITE_CMD_FLOW_CTL_ACK 6 + +/* Command for report packet indicating link quality metrics. */ +#define MUX_LITE_CMD_LINK_STATUS_REPORT 7 + +/* Response to a report packet */ +#define MUX_LITE_CMD_LINK_STATUS_REPORT_RESP 8 + +/* Used to reset a command/response state. */ +#define MUX_CMD_INVALID 255 + +/* command response : command processed successfully */ +#define MUX_CMD_RESP_SUCCESS 0 + +/* MUX for route link devices */ +#define IPC_MEM_WWAN_MUX BIT(0) + +/* Initiated actions to change the state of the MUX object. */ +enum mux_event { + MUX_E_INACTIVE, /* No initiated actions. */ + MUX_E_MUX_SESSION_OPEN, /* Create the MUX channel and a session. */ + MUX_E_MUX_SESSION_CLOSE, /* Release a session. */ + MUX_E_MUX_CHANNEL_CLOSE, /* Release the MUX channel. */ + MUX_E_NO_ORDERS, /* No MUX order. */ + MUX_E_NOT_APPLICABLE, /* Defect IP MUX. */ +}; + +/* MUX session open command. */ +struct mux_session_open { + enum mux_event event; + __le32 if_id; +}; + +/* MUX session close command. */ +struct mux_session_close { + enum mux_event event; + __le32 if_id; +}; + +/* MUX channel close command. */ +struct mux_channel_close { + enum mux_event event; +}; + +/* Default message type to find out the right message type. */ +struct mux_common { + enum mux_event event; +}; + +/* List of ops in MUX mode. */ +union mux_msg { + struct mux_session_open session_open; + struct mux_session_close session_close; + struct mux_channel_close channel_close; + struct mux_common common; +}; + +/* Parameter definition of the open session command. */ +struct mux_cmd_open_session { + u8 flow_ctrl; /* 0: Flow control disabled (flow allowed). */ + /* 1: Flow control enabled (flow not allowed)*/ + u8 ipv4v6_hints; /* 0: IPv4/IPv6 hints not supported.*/ + /* 1: IPv4/IPv6 hints supported*/ + __le16 reserved2; /* Reserved. Set to zero. */ + __le32 dl_head_pad_len; /* Maximum length supported */ + /* for DL head padding on a datagram. */ +}; + +/* Parameter definition of the open session response. */ +struct mux_cmd_open_session_resp { + __le32 response; /* Response code */ + u8 flow_ctrl; /* 0: Flow control disabled (flow allowed). */ + /* 1: Flow control enabled (flow not allowed) */ + u8 ipv4v6_hints; /* 0: IPv4/IPv6 hints not supported */ + /* 1: IPv4/IPv6 hints supported */ + __le16 reserved2; /* Reserved. Set to zero. */ + __le32 ul_head_pad_len; /* Actual length supported for */ + /* UL head padding on adatagram.*/ +}; + +/* Parameter definition of the close session response code */ +struct mux_cmd_close_session_resp { + __le32 response; +}; + +/* Parameter definition of the flow control command. */ +struct mux_cmd_flow_ctl { + __le32 mask; /* indicating the desired flow control */ + /* state for various flows/queues */ +}; + +/* Parameter definition of the link status report code*/ +struct mux_cmd_link_status_report { + u8 payload; +}; + +/* Parameter definition of the link status report response code. */ +struct mux_cmd_link_status_report_resp { + __le32 response; +}; + +/** + * union mux_cmd_param - Union-definition of the command parameters. + * @open_session: Inband command for open session + * @open_session_resp: Inband command for open session response + * @close_session_resp: Inband command for close session response + * @flow_ctl: In-band flow control on the opened interfaces + * @link_status: In-band Link Status Report + * @link_status_resp: In-band command for link status report response + */ +union mux_cmd_param { + struct mux_cmd_open_session open_session; + struct mux_cmd_open_session_resp open_session_resp; + struct mux_cmd_close_session_resp close_session_resp; + struct mux_cmd_flow_ctl flow_ctl; + struct mux_cmd_link_status_report link_status; + struct mux_cmd_link_status_report_resp link_status_resp; +}; + +/* States of the MUX object.. */ +enum mux_state { + MUX_S_INACTIVE, /* IP MUX is unused. */ + MUX_S_ACTIVE, /* IP MUX channel is available. */ + MUX_S_ERROR, /* Defect IP MUX. */ +}; + +/* Supported MUX protocols. */ +enum ipc_mux_protocol { + MUX_UNKNOWN, + MUX_LITE, +}; + +/* Supported UL data transfer methods. */ +enum ipc_mux_ul_flow { + MUX_UL_UNKNOWN, + MUX_UL, /* Normal UL data transfer */ + MUX_UL_ON_CREDITS, /* UL data transfer will be based on credits */ +}; + +/* List of the MUX session. */ +struct mux_session { + struct iosm_wwan *wwan; /*Network i/f used for communication*/ + int if_id; /* i/f id for session open message.*/ + u32 flags; + u32 ul_head_pad_len; /* Nr of bytes for UL head padding. */ + u32 dl_head_pad_len; /* Nr of bytes for DL head padding. */ + struct sk_buff_head ul_list; /* skb entries for an ADT. */ + u32 flow_ctl_mask; /* UL flow control */ + u32 flow_ctl_en_cnt; /* Flow control Enable cmd count */ + u32 flow_ctl_dis_cnt; /* Flow Control Disable cmd count */ + int ul_flow_credits; /* UL flow credits */ + u8 net_tx_stop:1, + flush:1; /* flush net interface ? */ +}; + +/* State of a single UL data block. */ +struct mux_adb { + struct sk_buff *dest_skb; /* Current UL skb for the data block. */ + u8 *buf; /* ADB memory. */ + struct mux_adgh *adgh; /* ADGH pointer */ + struct sk_buff *qlth_skb; /* QLTH pointer */ + u32 *next_table_index; /* Pointer to next table index. */ + struct sk_buff_head free_list; /* List of alloc. ADB for the UL sess.*/ + int size; /* Size of the ADB memory. */ + u32 if_cnt; /* Statistic counter */ + u32 dg_cnt_total; + u32 payload_size; +}; + +/* Temporary ACB state. */ +struct mux_acb { + struct sk_buff *skb; /* Used UL skb. */ + int if_id; /* Session id. */ + u32 wanted_response; + u32 got_response; + u32 cmd; + union mux_cmd_param got_param; /* Received command/response parameter */ +}; + +/** + * struct iosm_mux - Structure of the data multiplexing over an IP channel. + * @dev: Pointer to device structure + * @session: Array of the MUX sessions. + * @channel: Reference to the IP MUX channel + * @pcie: Pointer to iosm_pcie struct + * @imem: Pointer to iosm_imem + * @wwan: Poinetr to iosm_wwan + * @ipc_protocol: Pointer to iosm_protocol + * @channel_id: Channel ID for MUX + * @protocol: Type of the MUX protocol + * @ul_flow: UL Flow type + * @nr_sessions: Number of sessions + * @instance_id: Instance ID + * @state: States of the MUX object + * @event: Initiated actions to change the state of the MUX object + * @tx_transaction_id: Transaction id for the ACB command. + * @rr_next_session: Next session number for round robin. + * @ul_adb: State of the UL ADB/ADGH. + * @size_needed: Variable to store the size needed during ADB preparation + * @ul_data_pend_bytes: Pending UL data to be processed in bytes + * @acb: Temporary ACB state + * @wwan_q_offset: This will hold the offset of the given instance + * Useful while passing or receiving packets from + * wwan/imem layer. + * @initialized: MUX object is initialized + * @ev_mux_net_transmit_pending: + * 0 means inform the IPC tasklet to pass the + * accumulated uplink ADB to CP. + * @adb_prep_ongoing: Flag for ADB preparation status + */ +struct iosm_mux { + struct device *dev; + struct mux_session session[IPC_MEM_MUX_IP_SESSION_ENTRIES]; + struct ipc_mem_channel *channel; + struct iosm_pcie *pcie; + struct iosm_imem *imem; + struct iosm_wwan *wwan; + struct iosm_protocol *ipc_protocol; + int channel_id; + enum ipc_mux_protocol protocol; + enum ipc_mux_ul_flow ul_flow; + int nr_sessions; + int instance_id; + enum mux_state state; + enum mux_event event; + u32 tx_transaction_id; + int rr_next_session; + struct mux_adb ul_adb; + int size_needed; + long long ul_data_pend_bytes; + struct mux_acb acb; + int wwan_q_offset; + u8 initialized:1, + ev_mux_net_transmit_pending:1, + adb_prep_ongoing:1; +}; + +/* MUX configuration structure */ +struct ipc_mux_config { + enum ipc_mux_protocol protocol; + enum ipc_mux_ul_flow ul_flow; + int nr_sessions; + int instance_id; +}; + +/** + * ipc_mux_init - Allocates and Init MUX instance + * @mux_cfg: Pointer to MUX configuration structure + * @ipc_imem: Pointer to imem data-struct + * + * Returns: Initialized mux pointer on success else NULL + */ +struct iosm_mux *ipc_mux_init(struct ipc_mux_config *mux_cfg, + struct iosm_imem *ipc_imem); + +/** + * ipc_mux_deinit - Deallocates MUX instance + * @ipc_mux: Pointer to the MUX instance. + */ +void ipc_mux_deinit(struct iosm_mux *ipc_mux); + +/** + * ipc_mux_check_n_restart_tx - Checks for pending UL date bytes and then + * it restarts the net interface tx queue if + * device has set flow control as off. + * @ipc_mux: Pointer to MUX data-struct + */ +void ipc_mux_check_n_restart_tx(struct iosm_mux *ipc_mux); + +/** + * ipc_mux_get_active_protocol - Returns the active MUX protocol type. + * @ipc_mux: Pointer to MUX data-struct + * + * Returns: enum of type ipc_mux_protocol + */ +enum ipc_mux_protocol ipc_mux_get_active_protocol(struct iosm_mux *ipc_mux); + +/** + * ipc_mux_open_session - Opens a MUX session for IP traffic. + * @ipc_mux: Pointer to MUX data-struct + * @session_nr: Interface ID or session number + * + * Returns: channel id on success, failure value on error + */ +int ipc_mux_open_session(struct iosm_mux *ipc_mux, int session_nr); + +/** + * ipc_mux_close_session - Closes a MUX session. + * @ipc_mux: Pointer to MUX data-struct + * @session_nr: Interface ID or session number + * + * Returns: channel id on success, failure value on error + */ +int ipc_mux_close_session(struct iosm_mux *ipc_mux, int session_nr); + +/** + * ipc_mux_get_max_sessions - Retuns the maximum sessions supported on the + * provided MUX instance.. + * @ipc_mux: Pointer to MUX data-struct + * + * Returns: Number of sessions supported on Success and failure value on error + */ +int ipc_mux_get_max_sessions(struct iosm_mux *ipc_mux); +#endif |