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/*-
* BSD LICENSE
*
* Copyright (c) 2017 Solarflare Communications Inc.
* All rights reserved.
*
* This software was jointly developed between OKTET Labs (under contract
* for Solarflare) and Solarflare Communications, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _SFC_DP_RX_H
#define _SFC_DP_RX_H
#include <rte_mempool.h>
#include <rte_ethdev.h>
#include "sfc_dp.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* Generic receive queue information used on data path.
* It must be kept as small as it is possible since it is built into
* the structure used on datapath.
*/
struct sfc_dp_rxq {
struct sfc_dp_queue dpq;
};
/**
* Datapath receive queue creation information.
*
* The structure is used just to pass information from control path to
* datapath. It could be just function arguments, but it would be hardly
* readable.
*/
struct sfc_dp_rx_qcreate_info {
/** Memory pool to allocate Rx buffer from */
struct rte_mempool *refill_mb_pool;
/** Minimum number of unused Rx descriptors to do refill */
unsigned int refill_threshold;
/**
* Usable mbuf data space in accordance with alignment and
* padding requirements imposed by HW.
*/
unsigned int buf_size;
/**
* Maximum number of Rx descriptors completed in one Rx event.
* Just for sanity checks if datapath would like to do.
*/
unsigned int batch_max;
/** Pseudo-header size */
unsigned int prefix_size;
/** Receive queue flags initializer */
unsigned int flags;
#define SFC_RXQ_FLAG_RSS_HASH 0x1
/** Rx queue size */
unsigned int rxq_entries;
/** DMA-mapped Rx descriptors ring */
void *rxq_hw_ring;
/** Associated event queue size */
unsigned int evq_entries;
/** Hardware event ring */
void *evq_hw_ring;
/** The queue index in hardware (required to push right doorbell) */
unsigned int hw_index;
/**
* Virtual address of the memory-mapped BAR to push Rx refill
* doorbell
*/
volatile void *mem_bar;
};
/**
* Allocate and initialize datapath receive queue.
*
* @param port_id The port identifier
* @param queue_id The queue identifier
* @param pci_addr PCI function address
* @param socket_id Socket identifier to allocate memory
* @param info Receive queue information
* @param dp_rxqp Location for generic datapath receive queue pointer
*
* @return 0 or positive errno.
*/
typedef int (sfc_dp_rx_qcreate_t)(uint16_t port_id, uint16_t queue_id,
const struct rte_pci_addr *pci_addr,
int socket_id,
const struct sfc_dp_rx_qcreate_info *info,
struct sfc_dp_rxq **dp_rxqp);
/**
* Free resources allocated for datapath recevie queue.
*/
typedef void (sfc_dp_rx_qdestroy_t)(struct sfc_dp_rxq *dp_rxq);
/**
* Receive queue start callback.
*
* It handovers EvQ to the datapath.
*/
typedef int (sfc_dp_rx_qstart_t)(struct sfc_dp_rxq *dp_rxq,
unsigned int evq_read_ptr);
/**
* Receive queue stop function called before flush.
*/
typedef void (sfc_dp_rx_qstop_t)(struct sfc_dp_rxq *dp_rxq,
unsigned int *evq_read_ptr);
/**
* Receive event handler used during queue flush only.
*/
typedef bool (sfc_dp_rx_qrx_ev_t)(struct sfc_dp_rxq *dp_rxq, unsigned int id);
/**
* Receive queue purge function called after queue flush.
*
* Should be used to free unused recevie buffers.
*/
typedef void (sfc_dp_rx_qpurge_t)(struct sfc_dp_rxq *dp_rxq);
/** Get packet types recognized/classified */
typedef const uint32_t * (sfc_dp_rx_supported_ptypes_get_t)(void);
/** Get number of pending Rx descriptors */
typedef unsigned int (sfc_dp_rx_qdesc_npending_t)(struct sfc_dp_rxq *dp_rxq);
/** Check Rx descriptor status */
typedef int (sfc_dp_rx_qdesc_status_t)(struct sfc_dp_rxq *dp_rxq,
uint16_t offset);
/** Receive datapath definition */
struct sfc_dp_rx {
struct sfc_dp dp;
unsigned int features;
#define SFC_DP_RX_FEAT_SCATTER 0x1
#define SFC_DP_RX_FEAT_MULTI_PROCESS 0x2
sfc_dp_rx_qcreate_t *qcreate;
sfc_dp_rx_qdestroy_t *qdestroy;
sfc_dp_rx_qstart_t *qstart;
sfc_dp_rx_qstop_t *qstop;
sfc_dp_rx_qrx_ev_t *qrx_ev;
sfc_dp_rx_qpurge_t *qpurge;
sfc_dp_rx_supported_ptypes_get_t *supported_ptypes_get;
sfc_dp_rx_qdesc_npending_t *qdesc_npending;
sfc_dp_rx_qdesc_status_t *qdesc_status;
eth_rx_burst_t pkt_burst;
};
static inline struct sfc_dp_rx *
sfc_dp_find_rx_by_name(struct sfc_dp_list *head, const char *name)
{
struct sfc_dp *p = sfc_dp_find_by_name(head, SFC_DP_RX, name);
return (p == NULL) ? NULL : container_of(p, struct sfc_dp_rx, dp);
}
static inline struct sfc_dp_rx *
sfc_dp_find_rx_by_caps(struct sfc_dp_list *head, unsigned int avail_caps)
{
struct sfc_dp *p = sfc_dp_find_by_caps(head, SFC_DP_RX, avail_caps);
return (p == NULL) ? NULL : container_of(p, struct sfc_dp_rx, dp);
}
extern struct sfc_dp_rx sfc_efx_rx;
extern struct sfc_dp_rx sfc_ef10_rx;
#ifdef __cplusplus
}
#endif
#endif /* _SFC_DP_RX_H */
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