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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
* Copyright (C) 2019-2022 Linaro Ltd.
*/
#ifndef _IPA_ENDPOINT_H_
#define _IPA_ENDPOINT_H_
#include <linux/types.h>
#include <linux/workqueue.h>
#include <linux/if_ether.h>
#include "gsi.h"
#include "ipa_reg.h"
struct net_device;
struct sk_buff;
struct ipa;
struct ipa_gsi_endpoint_data;
/* Non-zero granularity of counter used to implement aggregation timeout */
#define IPA_AGGR_GRANULARITY 500 /* microseconds */
#define IPA_MTU ETH_DATA_LEN
enum ipa_endpoint_name {
IPA_ENDPOINT_AP_COMMAND_TX,
IPA_ENDPOINT_AP_LAN_RX,
IPA_ENDPOINT_AP_MODEM_TX,
IPA_ENDPOINT_AP_MODEM_RX,
IPA_ENDPOINT_MODEM_COMMAND_TX,
IPA_ENDPOINT_MODEM_LAN_TX,
IPA_ENDPOINT_MODEM_LAN_RX,
IPA_ENDPOINT_MODEM_AP_TX,
IPA_ENDPOINT_MODEM_AP_RX,
IPA_ENDPOINT_MODEM_DL_NLO_TX,
IPA_ENDPOINT_COUNT, /* Number of names (not an index) */
};
#define IPA_ENDPOINT_MAX 32 /* Max supported by driver */
/**
* struct ipa_endpoint_tx - Endpoint configuration for TX endpoints
* @seq_type: primary packet processing sequencer type
* @seq_rep_type: sequencer type for replication processing
* @status_endpoint: endpoint to which status elements are sent
*
* The @status_endpoint is only valid if the endpoint's @status_enable
* flag is set.
*/
struct ipa_endpoint_tx {
enum ipa_seq_type seq_type;
enum ipa_seq_rep_type seq_rep_type;
enum ipa_endpoint_name status_endpoint;
};
/**
* struct ipa_endpoint_rx - Endpoint configuration for RX endpoints
* @buffer_size: requested receive buffer size (bytes)
* @pad_align: power-of-2 boundary to which packet payload is aligned
* @aggr_time_limit: time before aggregation closes (microseconds)
* @aggr_hard_limit: whether aggregation closes before or after boundary
* @aggr_close_eof: whether aggregation closes on end-of-frame
* @holb_drop: whether to drop packets to avoid head-of-line blocking
*
* The actual size of the receive buffer is rounded up if necessary
* to be a power-of-2 number of pages.
*
* With each packet it transfers, the IPA hardware can perform certain
* transformations of its packet data. One of these is adding pad bytes
* to the end of the packet data so the result ends on a power-of-2 boundary.
*
* It is also able to aggregate multiple packets into a single receive buffer.
* Aggregation is "open" while a buffer is being filled, and "closes" when
* certain criteria are met.
*
* A time limit can be specified to close aggregation. Aggregation will be
* closed if this period passes after data is first written into a receive
* buffer. If not specified, no time limit is imposed.
*
* Insufficient space available in the receive buffer can close aggregation.
* The aggregation byte limit defines the point (in units of 1024 bytes) in
* the buffer where aggregation closes. With a "soft" aggregation limit,
* aggregation closes when a packet written to the buffer *crosses* that
* aggregation limit. With a "hard" aggregation limit, aggregation will
* close *before* writing a packet that would cross that boundary.
*/
struct ipa_endpoint_rx {
u32 buffer_size;
u32 pad_align;
u32 aggr_time_limit;
bool aggr_hard_limit;
bool aggr_close_eof;
bool holb_drop;
};
/**
* struct ipa_endpoint_config - IPA endpoint hardware configuration
* @resource_group: resource group to assign endpoint to
* @checksum: whether checksum offload is enabled
* @qmap: whether endpoint uses QMAP protocol
* @aggregation: whether endpoint supports aggregation
* @status_enable: whether endpoint uses status elements
* @dma_mode: whether endpoint operates in DMA mode
* @dma_endpoint: peer endpoint, if operating in DMA mode
* @tx: TX-specific endpoint information (see above)
* @rx: RX-specific endpoint information (see above)
*/
struct ipa_endpoint_config {
u32 resource_group;
bool checksum;
bool qmap;
bool aggregation;
bool status_enable;
bool dma_mode;
enum ipa_endpoint_name dma_endpoint;
union {
struct ipa_endpoint_tx tx;
struct ipa_endpoint_rx rx;
};
};
/**
* enum ipa_replenish_flag: RX buffer replenish flags
*
* @IPA_REPLENISH_ENABLED: Whether receive buffer replenishing is enabled
* @IPA_REPLENISH_ACTIVE: Whether replenishing is underway
* @IPA_REPLENISH_COUNT: Number of defined replenish flags
*/
enum ipa_replenish_flag {
IPA_REPLENISH_ENABLED,
IPA_REPLENISH_ACTIVE,
IPA_REPLENISH_COUNT, /* Number of flags (must be last) */
};
/**
* struct ipa_endpoint - IPA endpoint information
* @ipa: IPA pointer
* @ee_id: Execution environmnent endpoint is associated with
* @channel_id: GSI channel used by the endpoint
* @endpoint_id: IPA endpoint number
* @toward_ipa: Endpoint direction (true = TX, false = RX)
* @config: Default endpoint configuration
* @skb_frag_max: Maximum allowed number of TX SKB fragments
* @evt_ring_id: GSI event ring used by the endpoint
* @netdev: Network device pointer, if endpoint uses one
* @replenish_flags: Replenishing state flags
* @replenish_count: Total number of replenish transactions committed
* @replenish_work: Work item used for repeated replenish failures
*/
struct ipa_endpoint {
struct ipa *ipa;
enum gsi_ee_id ee_id;
u32 channel_id;
u32 endpoint_id;
bool toward_ipa;
struct ipa_endpoint_config config;
u32 skb_frag_max; /* Used for netdev TX only */
u32 evt_ring_id;
/* Net device this endpoint is associated with, if any */
struct net_device *netdev;
/* Receive buffer replenishing for RX endpoints */
DECLARE_BITMAP(replenish_flags, IPA_REPLENISH_COUNT);
u64 replenish_count;
struct delayed_work replenish_work; /* global wq */
};
void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa);
void ipa_endpoint_modem_pause_all(struct ipa *ipa, bool enable);
int ipa_endpoint_modem_exception_reset_all(struct ipa *ipa);
int ipa_endpoint_skb_tx(struct ipa_endpoint *endpoint, struct sk_buff *skb);
int ipa_endpoint_enable_one(struct ipa_endpoint *endpoint);
void ipa_endpoint_disable_one(struct ipa_endpoint *endpoint);
void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint);
void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint);
void ipa_endpoint_suspend(struct ipa *ipa);
void ipa_endpoint_resume(struct ipa *ipa);
void ipa_endpoint_setup(struct ipa *ipa);
void ipa_endpoint_teardown(struct ipa *ipa);
int ipa_endpoint_config(struct ipa *ipa);
void ipa_endpoint_deconfig(struct ipa *ipa);
void ipa_endpoint_default_route_set(struct ipa *ipa, u32 endpoint_id);
void ipa_endpoint_default_route_clear(struct ipa *ipa);
int ipa_endpoint_init(struct ipa *ipa, u32 count,
const struct ipa_gsi_endpoint_data *data);
void ipa_endpoint_exit(struct ipa *ipa);
void ipa_endpoint_trans_complete(struct ipa_endpoint *ipa,
struct gsi_trans *trans);
void ipa_endpoint_trans_release(struct ipa_endpoint *ipa,
struct gsi_trans *trans);
#endif /* _IPA_ENDPOINT_H_ */
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