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![Alex Elder](/assets/img/avatar_default.png)
Don't assume that a 500 microsecond time limit should be used for all receive endpoints that support aggregation. Instead, specify the time limit to use in the configuration data. Set a 500 microsecond limit for all existing RX endpoints, as before. Checking for overflow for the time limit field is a bit complicated. Rather than duplicate a lot of code in ipa_endpoint_data_valid_one(), call WARN() if any value is found to be too large when encoding it. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
207 lines
6.7 KiB
C
207 lines
6.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
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* Copyright (C) 2019-2020 Linaro Ltd.
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*/
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#ifndef _IPA_ENDPOINT_H_
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#define _IPA_ENDPOINT_H_
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#include <linux/types.h>
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#include <linux/workqueue.h>
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#include <linux/if_ether.h>
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#include "gsi.h"
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#include "ipa_reg.h"
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struct net_device;
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struct sk_buff;
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struct ipa;
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struct ipa_gsi_endpoint_data;
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/* Non-zero granularity of counter used to implement aggregation timeout */
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#define IPA_AGGR_GRANULARITY 500 /* microseconds */
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#define IPA_MTU ETH_DATA_LEN
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enum ipa_endpoint_name {
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IPA_ENDPOINT_AP_COMMAND_TX,
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IPA_ENDPOINT_AP_LAN_RX,
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IPA_ENDPOINT_AP_MODEM_TX,
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IPA_ENDPOINT_AP_MODEM_RX,
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IPA_ENDPOINT_MODEM_COMMAND_TX,
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IPA_ENDPOINT_MODEM_LAN_TX,
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IPA_ENDPOINT_MODEM_LAN_RX,
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IPA_ENDPOINT_MODEM_AP_TX,
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IPA_ENDPOINT_MODEM_AP_RX,
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IPA_ENDPOINT_MODEM_DL_NLO_TX,
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IPA_ENDPOINT_COUNT, /* Number of names (not an index) */
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};
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#define IPA_ENDPOINT_MAX 32 /* Max supported by driver */
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/**
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* struct ipa_endpoint_tx - Endpoint configuration for TX endpoints
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* @seq_type: primary packet processing sequencer type
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* @seq_rep_type: sequencer type for replication processing
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* @status_endpoint: endpoint to which status elements are sent
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*
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* The @status_endpoint is only valid if the endpoint's @status_enable
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* flag is set.
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*/
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struct ipa_endpoint_tx {
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enum ipa_seq_type seq_type;
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enum ipa_seq_rep_type seq_rep_type;
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enum ipa_endpoint_name status_endpoint;
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};
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/**
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* struct ipa_endpoint_rx - Endpoint configuration for RX endpoints
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* @buffer_size: requested receive buffer size (bytes)
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* @pad_align: power-of-2 boundary to which packet payload is aligned
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* @aggr_time_limit: time before aggregation closes (microseconds)
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* @aggr_hard_limit: whether aggregation closes before or after boundary
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* @aggr_close_eof: whether aggregation closes on end-of-frame
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* @holb_drop: whether to drop packets to avoid head-of-line blocking
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*
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* The actual size of the receive buffer is rounded up if necessary
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* to be a power-of-2 number of pages.
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*
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* With each packet it transfers, the IPA hardware can perform certain
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* transformations of its packet data. One of these is adding pad bytes
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* to the end of the packet data so the result ends on a power-of-2 boundary.
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*
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* It is also able to aggregate multiple packets into a single receive buffer.
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* Aggregation is "open" while a buffer is being filled, and "closes" when
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* certain criteria are met.
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*
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* A time limit can be specified to close aggregation. Aggregation will be
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* closed if this period passes after data is first written into a receive
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* buffer. If not specified, no time limit is imposed.
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*
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* Insufficient space available in the receive buffer can close aggregation.
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* The aggregation byte limit defines the point (in units of 1024 bytes) in
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* the buffer where aggregation closes. With a "soft" aggregation limit,
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* aggregation closes when a packet written to the buffer *crosses* that
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* aggregation limit. With a "hard" aggregation limit, aggregation will
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* close *before* writing a packet that would cross that boundary.
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*/
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struct ipa_endpoint_rx {
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u32 buffer_size;
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u32 pad_align;
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u32 aggr_time_limit;
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bool aggr_hard_limit;
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bool aggr_close_eof;
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bool holb_drop;
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};
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/**
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* struct ipa_endpoint_config - IPA endpoint hardware configuration
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* @resource_group: resource group to assign endpoint to
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* @checksum: whether checksum offload is enabled
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* @qmap: whether endpoint uses QMAP protocol
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* @aggregation: whether endpoint supports aggregation
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* @status_enable: whether endpoint uses status elements
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* @dma_mode: whether endpoint operates in DMA mode
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* @dma_endpoint: peer endpoint, if operating in DMA mode
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* @tx: TX-specific endpoint information (see above)
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* @rx: RX-specific endpoint information (see above)
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*/
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struct ipa_endpoint_config {
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u32 resource_group;
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bool checksum;
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bool qmap;
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bool aggregation;
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bool status_enable;
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bool dma_mode;
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enum ipa_endpoint_name dma_endpoint;
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union {
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struct ipa_endpoint_tx tx;
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struct ipa_endpoint_rx rx;
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};
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};
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/**
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* enum ipa_replenish_flag: RX buffer replenish flags
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*
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* @IPA_REPLENISH_ENABLED: Whether receive buffer replenishing is enabled
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* @IPA_REPLENISH_ACTIVE: Whether replenishing is underway
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* @IPA_REPLENISH_COUNT: Number of defined replenish flags
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*/
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enum ipa_replenish_flag {
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IPA_REPLENISH_ENABLED,
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IPA_REPLENISH_ACTIVE,
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IPA_REPLENISH_COUNT, /* Number of flags (must be last) */
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};
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/**
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* struct ipa_endpoint - IPA endpoint information
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* @ipa: IPA pointer
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* @ee_id: Execution environmnent endpoint is associated with
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* @channel_id: GSI channel used by the endpoint
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* @endpoint_id: IPA endpoint number
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* @toward_ipa: Endpoint direction (true = TX, false = RX)
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* @config: Default endpoint configuration
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* @trans_tre_max: Maximum number of TRE descriptors per transaction
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* @evt_ring_id: GSI event ring used by the endpoint
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* @netdev: Network device pointer, if endpoint uses one
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* @replenish_flags: Replenishing state flags
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* @replenish_count: Total number of replenish transactions committed
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* @replenish_work: Work item used for repeated replenish failures
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*/
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struct ipa_endpoint {
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struct ipa *ipa;
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enum gsi_ee_id ee_id;
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u32 channel_id;
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u32 endpoint_id;
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bool toward_ipa;
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struct ipa_endpoint_config config;
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u32 trans_tre_max;
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u32 evt_ring_id;
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/* Net device this endpoint is associated with, if any */
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struct net_device *netdev;
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/* Receive buffer replenishing for RX endpoints */
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DECLARE_BITMAP(replenish_flags, IPA_REPLENISH_COUNT);
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u64 replenish_count;
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struct delayed_work replenish_work; /* global wq */
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};
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void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa);
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void ipa_endpoint_modem_pause_all(struct ipa *ipa, bool enable);
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int ipa_endpoint_modem_exception_reset_all(struct ipa *ipa);
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int ipa_endpoint_skb_tx(struct ipa_endpoint *endpoint, struct sk_buff *skb);
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int ipa_endpoint_enable_one(struct ipa_endpoint *endpoint);
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void ipa_endpoint_disable_one(struct ipa_endpoint *endpoint);
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void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint);
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void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint);
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void ipa_endpoint_suspend(struct ipa *ipa);
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void ipa_endpoint_resume(struct ipa *ipa);
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void ipa_endpoint_setup(struct ipa *ipa);
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void ipa_endpoint_teardown(struct ipa *ipa);
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int ipa_endpoint_config(struct ipa *ipa);
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void ipa_endpoint_deconfig(struct ipa *ipa);
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void ipa_endpoint_default_route_set(struct ipa *ipa, u32 endpoint_id);
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void ipa_endpoint_default_route_clear(struct ipa *ipa);
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u32 ipa_endpoint_init(struct ipa *ipa, u32 count,
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const struct ipa_gsi_endpoint_data *data);
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void ipa_endpoint_exit(struct ipa *ipa);
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void ipa_endpoint_trans_complete(struct ipa_endpoint *ipa,
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struct gsi_trans *trans);
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void ipa_endpoint_trans_release(struct ipa_endpoint *ipa,
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struct gsi_trans *trans);
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#endif /* _IPA_ENDPOINT_H_ */
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