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/*-
* Copyright (c) 2010-2011 Solarflare Communications, Inc.
* All rights reserved.
*
* This software was developed in part by Philip Paeps under contract for
* 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 AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#ifndef _SFXGE_TX_H
#define _SFXGE_TX_H
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
/* Maximum number of DMA segments needed to map an mbuf chain. With
* TSO, the mbuf length may be just over 64K, divided into 2K mbuf
* clusters. (The chain could be longer than this initially, but can
* be shortened with m_collapse().)
*/
#define SFXGE_TX_MAPPING_MAX_SEG (64 / 2 + 1)
/* Maximum number of DMA segments needed to map an output packet. It
* could overlap all mbufs in the chain and also require an extra
* segment for a TSO header.
*/
#define SFXGE_TX_PACKET_MAX_SEG (SFXGE_TX_MAPPING_MAX_SEG + 1)
/*
* Buffer mapping flags.
*
* Buffers and DMA mappings must be freed when the last descriptor
* referring to them is completed. Set the TX_BUF_UNMAP and
* TX_BUF_MBUF flags on the last descriptor generated for an mbuf
* chain. Set only the TX_BUF_UNMAP flag on a descriptor referring to
* a heap buffer.
*/
enum sfxge_tx_buf_flags {
TX_BUF_UNMAP = 1,
TX_BUF_MBUF = 2,
};
/*
* Buffer mapping information for descriptors in flight.
*/
struct sfxge_tx_mapping {
union {
struct mbuf *mbuf;
caddr_t heap_buf;
} u;
bus_dmamap_t map;
enum sfxge_tx_buf_flags flags;
};
#define SFXGE_TX_DPL_GET_PKT_LIMIT_DEFAULT 64
#define SFXGE_TX_DPL_PUT_PKT_LIMIT_DEFAULT 64
/*
* Deferred packet list.
*/
struct sfxge_tx_dpl {
uintptr_t std_put; /* Head of put list. */
struct mbuf *std_get; /* Head of get list. */
struct mbuf **std_getp; /* Tail of get list. */
unsigned int std_count; /* Count of packets. */
};
#define SFXGE_TX_BUFFER_SIZE 0x400
#define SFXGE_TX_HEADER_SIZE 0x100
#define SFXGE_TX_COPY_THRESHOLD 0x200
enum sfxge_txq_state {
SFXGE_TXQ_UNINITIALIZED = 0,
SFXGE_TXQ_INITIALIZED,
SFXGE_TXQ_STARTED
};
enum sfxge_txq_type {
SFXGE_TXQ_NON_CKSUM = 0,
SFXGE_TXQ_IP_CKSUM,
SFXGE_TXQ_IP_TCP_UDP_CKSUM,
SFXGE_TXQ_NTYPES
};
#define SFXGE_TXQ_UNBLOCK_LEVEL (EFX_TXQ_LIMIT(SFXGE_NDESCS) / 4)
#define SFXGE_TX_BATCH 64
#ifdef SFXGE_HAVE_MQ
#define SFXGE_TXQ_LOCK(txq) (&(txq)->lock)
#define SFXGE_TX_SCALE(sc) ((sc)->intr.n_alloc)
#else
#define SFXGE_TXQ_LOCK(txq) (&(txq)->sc->tx_lock)
#define SFXGE_TX_SCALE(sc) 1
#endif
struct sfxge_txq {
/* The following fields should be written very rarely */
struct sfxge_softc *sc;
enum sfxge_txq_state init_state;
enum sfxge_flush_state flush_state;
enum sfxge_txq_type type;
unsigned int txq_index;
unsigned int evq_index;
efsys_mem_t mem;
unsigned int buf_base_id;
struct sfxge_tx_mapping *stmp; /* Packets in flight. */
bus_dma_tag_t packet_dma_tag;
efx_buffer_t *pend_desc;
efx_txq_t *common;
struct sfxge_txq *next;
efsys_mem_t *tsoh_buffer;
/* This field changes more often and is read regularly on both
* the initiation and completion paths
*/
int blocked __aligned(CACHE_LINE_SIZE);
/* The following fields change more often, and are used mostly
* on the initiation path
*/
#ifdef SFXGE_HAVE_MQ
struct mtx lock __aligned(CACHE_LINE_SIZE);
struct sfxge_tx_dpl dpl; /* Deferred packet list. */
unsigned int n_pend_desc;
#else
unsigned int n_pend_desc __aligned(CACHE_LINE_SIZE);
#endif
unsigned int added;
unsigned int reaped;
/* Statistics */
unsigned long tso_bursts;
unsigned long tso_packets;
unsigned long tso_long_headers;
unsigned long collapses;
unsigned long drops;
unsigned long early_drops;
/* The following fields change more often, and are used mostly
* on the completion path
*/
unsigned int pending __aligned(CACHE_LINE_SIZE);
unsigned int completed;
};
extern int sfxge_tx_packet_add(struct sfxge_txq *, struct mbuf *);
extern int sfxge_tx_init(struct sfxge_softc *sc);
extern void sfxge_tx_fini(struct sfxge_softc *sc);
extern int sfxge_tx_start(struct sfxge_softc *sc);
extern void sfxge_tx_stop(struct sfxge_softc *sc);
extern void sfxge_tx_qcomplete(struct sfxge_txq *txq);
extern void sfxge_tx_qflush_done(struct sfxge_txq *txq);
#ifdef SFXGE_HAVE_MQ
extern void sfxge_if_qflush(struct ifnet *ifp);
extern int sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m);
#else
extern void sfxge_if_start(struct ifnet *ifp);
#endif
#endif
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