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gems-kernel/source/THIRDPARTY/xnu/bsd/skywalk/channel/os_channel_private.h
Sam Sneed f5727805f2 add darwin/xnu functionality
2024-06-03 11:29:39 -05:00

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/*
* Copyright (c) 2015-2023 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright (C) 2012-2014 Matteo Landi, Luigi Rizzo, Giuseppe Lettieri.
* All rights reserved.
* Copyright (C) 2013-2014 Universita` di Pisa. All rights reserved.
*
* 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.
*/
#ifndef _SKYWALK_OS_CHANNEL_PRIVATE_H_
#define _SKYWALK_OS_CHANNEL_PRIVATE_H_
#if defined(PRIVATE) || defined(BSD_KERNEL_PRIVATE)
#include <sys/time.h>
#include <sys/signal.h>
#include <sys/guarded.h>
#include <sys/utsname.h>
#include <skywalk/os_channel.h>
#include <skywalk/os_stats_private.h>
/* BEGIN CSTYLED */
/*
* The userspace data structures used by Skywalk are shown below.
*
* The kernel allocates the regions for the various object types,
* and maps them to the userspace task in a contiguous span, one
* after another.
*
* Each channel file descriptor comes with its own memory map,
* and the layout of the rest of the objects is described in the
* __user_channel_schema structure associated with the channel.
* This schema structure is mapped read-only in the task.
*
* +=======================+
* | __user_channel_schema | (1 per channel fd)
* +=======================+
* | csm_ver |
* | csm_flags |
* |-----------------------|
* | csm_tx_rings |
* | csm_rx_rings |
* | csm_allocator_rings |
* | csm_event_rings |
* |-----------------------|
* | csm_stats_ofs | <<---+
* |-----------------------| |
* | csm_flowadv_max | |
* | csm_flowadv_ofs | <<---+ relative to base of memory map
* |-----------------------| |
* | csm_md_redzone_cookie | |
* | csm_md_type | |
* | csm_md_subtype | |
* |-----------------------| |
* | csm_stats_ofs | <<---+
* | csm_stats_type | |
* |-----------------------| |
* | csm_nexusadv_ofs | <<---+
* |-----------------------|
* | csm_kern_name |
* | csm_kern_uuid |
* |-----------------------|
* | TX csm_ring_ofs[0] | <<---+
* | TX csm_sd_ofs[0] | |
* : ... : |
* | TX csm_ring_ofs[t] | |
* | TX csm_sd_ofs[t] | |
* |-----------------------| |
* | RX csm_ring_ofs[0] | <<---+ these offsets are relative
* | RX csm_sd_ofs[0] | | to each schema structure
* : ... : |
* | RX csm_ring_ofs[t] | |
* | RX csm_sd_ofs[t] | |
* |-----------------------| |
* | A csm_ring_ofs[0] | |
* | A csm_sd_ofs[0] | |
* : ... : |
* | A csm_ring_ofs[t] | <<---+
* | A csm_sd_ofs[t] | |
* |-----------------------| |
* | F csm_ring_ofs[0] | |
* | F csm_sd_ofs[0] | |
* : ... : |
* | F csm_ring_ofs[t] | <<---+
* | F csm_sd_ofs[t] | |
* |-----------------------| |
* | EV csm_ring_ofs[0] | <<---+
* | EV csm_sd_ofs[0] |
* +-----------------------+
* (variable length)
*
* On nexus adapters that support statistics or flow advisory, the
* csm_stats_ofs or csm_flowadv_ofs would be non-zero, and their values
* represent the offset to the respective objects from the base of the
* memory map. This is because those regions are shared amongst all
* channels opened to the adapter associated with the nexus port.
*
* Other regions, such as rings and slot descriptors, are unique to the
* channel itself. They are always present, and their values indicated
* by csm_{ring,sd}_ofs represent the offset to the respective objects
* from the schema pointer (not from base of memory map.) This is done
* to support channels bound to any of the adapter's ring-pairs.
*
* See notes below on CSM_CURRENT_VERSION.
*/
/* END CSTYLED */
#define CHANNEL_SCHEMA_KERN_NAME _SYS_NAMELEN
struct __user_channel_schema {
/*
* Schema properties, kernel version string and kernel
* executable UUID (for debugging). These 4 fields
* must be at the beginning of the structure.
*/
const uint32_t csm_ver; /* schema layout version */
const volatile uint32_t csm_flags; /* CSM_* flags */
const char csm_kern_name[CHANNEL_SCHEMA_KERN_NAME];
const uuid_t csm_kern_uuid;
/*
* The rest of the fields may be rearranged as needed, with
* the expectation that CSM_CURRENT_VERSION be bumped up on
* each modification.
*/
/*
* The number of packet rings available for this channel.
*/
const uint32_t csm_tx_rings; /* # of tx rings */
const uint32_t csm_rx_rings; /* # of rx rings */
/*
* The number of allocator ring pair available for this channel.
* If the channel supports user packet pool then 1 pair of
* alloc/free ring per channel are used to manage the packet
* allocation from userspace.
* If the channel supports multi-buflet packet then an additional pair
* of alloc/free ring is used to manage the buffer (buflet) allocation
* from userspace.
*/
const uint32_t csm_allocator_ring_pairs;
/*
* number of event rings for this channel.
*/
const uint32_t csm_num_event_rings;
const uint32_t csm_large_buf_alloc_rings;
/*
* Flow advisory region offset; this field will be 0 if the
* nexus isn't capable of flow advisory scheme. Otherwise,
* it points to a table of flow advisory entries, and the
* total number of entries is indicated by csm_flowadv_max.
*/
const uint32_t csm_flowadv_max;
const mach_vm_offset_t csm_flowadv_ofs
__attribute__((aligned(sizeof(uint64_t))));
/*
* Metadata region redzone, type and sub-type.
*/
const uint64_t csm_md_redzone_cookie /* metadata redzone cookie */
__attribute__((aligned(sizeof(uint64_t))));
const nexus_meta_type_t csm_md_type; /* metadata type */
const nexus_meta_subtype_t csm_md_subtype; /* metadata subtype */
/*
* Statistics region offset; each nexus is free to use this
* region and break it up into multiple smaller regions if
* needed. The definition and interpretation of the contents
* is left to the nexus. The value of this field will be 0
* if the nexus doesn't facilitate shareable statistics.
*/
const mach_vm_offset_t csm_stats_ofs
__attribute__((aligned(sizeof(uint64_t))));
const nexus_stats_type_t csm_stats_type;
/*
* Nexus advisory region offset; this field will be 0 if the
* nexus isn't providing any nexus-wide advisories. Otherwise,
* it points to the nexus advisory structure.
*/
const mach_vm_offset_t csm_nexusadv_ofs
__attribute__((aligned(sizeof(uint64_t))));
/*
* The following array contains the offset of each channel ring
* from the beginning of this structure, as well as the ring's
* slot descriptor, in the following order:
*
* tx rings (csm_tx_rings-csm_htx_rings)
* rx rings (csm_rx_rings-csm_hrx_rings)
* allocator rings (either 2 or 4 or none) (optional)
* event rings (optional)
*
* The area is filled up by the kernel, and then only read
* by userspace code.
*/
struct {
const mach_vm_offset_t ring_off; /* __user_channel_ring */
const mach_vm_offset_t sd_off; /* __slot_desc */
} csm_ring_ofs[0] __attribute__((aligned(sizeof(uint64_t))));
};
/*
* Schema layout version. Make sure to bump this up each time
* struct __user_channel_schema layout is modified. This helps
* to ensure that both kernel and libsystem_kernel are in sync,
* as otherwise we'd assert due to version mismatch.
*/
#define CSM_CURRENT_VERSION 18
/* valid values for csm_flags */
#define CSM_PRIV_MEM 0x1 /* private memory region */
#define CSM_ACTIVE (1U << 31) /* channel is active */
#define CSM_BITS "\020\01PRIV_MEM\040ACTIVE"
/* the size of __user_channel_schema structure for n total rings */
#define CHANNEL_SCHEMA_SIZE(n) \
__builtin_offsetof(struct __user_channel_schema, csm_ring_ofs[(n)])
/*
* Some fields should be cache-aligned to reduce contention.
* The alignment is architecture and OS dependent; we use an
* estimate that should cover most architectures.
*/
#define CHANNEL_CACHE_ALIGN_MAX 128 /* max cache line size */
/*
* Ring kind.
*/
#define CR_KIND_RX 0 /* same as NR_RX */
#define CR_KIND_TX 1 /* same as NR_TX */
#define CR_KIND_ALLOC 2 /* same as NR_A */
#define CR_KIND_FREE 3 /* same as NR_F */
#define CR_KIND_EVENT 4 /* same as NR_EV */
#define CR_KIND_LARGE_BUF_ALLOC 5 /* same as NR_LBA */
typedef uint32_t slot_idx_t;
typedef uint32_t obj_idx_t;
#define OBJ_IDX_NONE ((obj_idx_t)-1)
/*
* This structure contains per-slot properties for userspace. If the flag
* SD_IDX_VALID is set, the descriptor contains the index of the metadata
* attached to the slot.
*
* TODO: adi@apple.com -- this will be made read-write for user pool.
* TODO: wshen0123@apple.com -- Should we make use of RX/TX
* preparation/writeback descriptors (in a union) for sd_len?
*/
struct __user_slot_desc {
obj_idx_t sd_md_idx; /* metadata index */
uint16_t sd_flags; /* slot flags */
/*
* XXX: sd_len is currently used only for the purpose of acoounting
* for the number of bytes pending to be read by the user channel.
* Currently the maximum size of a packet being transported on user
* channel is <= UINT16_MAX, so sd_len being uint16_t is fine, but
* this needs to be changed if we want to go beyond UINT16_MAX.
*/
uint16_t sd_len; /* slot len */
};
/* valid values for sd_flags */
#define SD_IDX_VALID 0x1 /* slot has metadata attached */
#ifdef KERNEL
#define SD_LEN_VALID 0x2 /* slot has packet length recorded */
#define SD_KERNEL_ONLY (1 << 15) /* kernel only; no user counterpart */
#define SD_FLAGS_USER (SD_IDX_VALID)
/* invariant flags we want to keep */
#define SD_SAVE_MASK (SD_KERNEL_ONLY)
#endif /* KERNEL */
/*
* SD_VALID_METADATA() returns TRUE if the slot has an attached metadata
*/
#define SD_VALID_METADATA(_sd) \
(!!((_sd)->sd_flags & SD_IDX_VALID))
/*
* Slot descriptor.
*/
struct __slot_desc {
union {
struct __user_slot_desc _sd_user;
uint64_t _sd_private[1];
};
};
#define SLOT_DESC_SZ (sizeof (struct __slot_desc))
#define SLOT_DESC_USD(_sdp) (&(_sdp)->_sd_user)
/*
* Ring.
*
* Channel representation of a TX or RX ring (also known as "queue").
* This is a queue implemented as a fixed-size circular array.
* At the software level the important fields are: head, cur, tail.
*
* The __user_channel_ring, and all slots and buffers in the range
* [head .. tail-1] are owned by the user program; the kernel only
* accesses them during a channel system call and in the user thread
* context.
*/
struct __user_channel_ring {
/*
* In TX rings:
*
* head first slot available for transmission;
* tail (readonly) first slot reserved to the kernel
* khead (readonly) kernel's view of next slot to send
* since last sync.
*
* [head .. tail-1] can be used for new packets to send;
*
* 'head' must be incremented as slots are filled with new packets to
* be sent;
*
* In RX rings:
*
* head first valid received packet;
* tail (readonly) first slot reserved to the kernel
* khead (readonly) kernel's view of next slot to reclaim
* since last sync.
*
* [head .. tail-1] contain received packets;
*
* 'head' must be incremented as slots are consumed and can be returned
* to the kernel;
*
*/
volatile slot_idx_t ring_head; /* (u) first user slot */
const volatile slot_idx_t ring_tail; /* (k) first kernel slot */
const volatile slot_idx_t ring_khead; /* (k) next to send/reclaim */
const uint32_t ring_num_slots; /* # of slots in the ring */
const uint32_t ring_def_buf_size; /* size of each default buffer */
const uint32_t ring_large_buf_size; /* size of each large buffer */
const uint16_t ring_md_size; /* size of each metadata */
const uint16_t ring_bft_size; /* size of each buflet metadata */
const uint16_t ring_id; /* unused */
const uint16_t ring_kind; /* kind of ring (tx or rx) */
/*
* Base addresses of {buf, metadata, slot descriptor} regions
* from this ring descriptor. This facilitates computing the
* addresses of those regions in the task's mapped memory.
*/
/* base address of default buffer region */
const mach_vm_offset_t ring_def_buf_base
__attribute((aligned(sizeof(uint64_t))));
/* base address of large buffer region */
const mach_vm_offset_t ring_large_buf_base
__attribute((aligned(sizeof(uint64_t))));
const mach_vm_offset_t ring_md_base /* base of metadata region */
__attribute((aligned(sizeof(uint64_t))));
const mach_vm_offset_t ring_sd_base /* base of slot desc region */
__attribute((aligned(sizeof(uint64_t))));
/*
* base of buflet metadata region
* value of 0 means that external buflet metadata is not present.
*/
const mach_vm_offset_t ring_bft_base
__attribute((aligned(sizeof(uint64_t))));
const volatile uint64_t ring_sync_time /* (k) time of last sync */
__attribute((aligned(sizeof(uint64_t))));
const volatile uint64_t ring_notify_time /* (k) time of last notify */
__attribute((aligned(sizeof(uint64_t))));
/* current working set for the packet allocator ring */
const volatile uint32_t ring_alloc_ws;
/* current working set for the buflet allocator ring */
const volatile uint32_t ring_alloc_buf_ws;
};
/* check if space is available in the ring */
#define CHANNEL_RING_EMPTY(_ring) ((_ring)->ring_head == (_ring)->ring_tail)
/*
* Flow advisory.
*
* Each flow that is registered with the nexus capable of supporting
* flow advisory is given an entry. Each entry resides in the flow
* advisory table that is mapped to the task.
* fae_id: is the flow identifier used by libnetcore to identify a flow.
* This identifier is passed as a metadata on all packets
* generated by the user space stack. This is the flow_id parameter
* which should be used while checking if a flow is
* admissible using the API os_channel_flow_admissible().
* fae_flowid: is a globally unique flow identifier generated by the
* flowswitch for each flow. Flowswitch stamps every TX packet
* with this identifier. This is the flow identifier which would
* be visible to the AQM logic and the driver. The flow advisory
* mechanism in kernel uses this fae_id to identify the flow entry
* in the flow advisory table.
*/
struct __flowadv_entry {
union {
uint64_t fae_id_64[2];
uint32_t fae_id_32[4];
uuid_t fae_id; /* flow ID from userspace stack */
};
volatile uint32_t fae_ce_cnt;
volatile uint32_t fae_pkt_cnt;
volatile uint32_t fae_flags; /* flags FLOWADVF_* */
/* flow ID generated by flowswitch */
uint32_t fae_flowid;
#ifdef KERNEL
#define fae_token fae_flowid
#endif /* KERNEL */
} __attribute__((aligned(sizeof(uint64_t))));
#define FLOWADVF_VALID 0x1 /* flow is valid */
#define FLOWADVF_SUSPENDED 0x2 /* flow is suspended */
/* channel event threshold */
struct ch_ev_thresh {
channel_threshold_unit_t cet_unit;
uint32_t cet_value;
};
/*
* Channel information.
*/
struct ch_info {
union {
uint64_t cinfo_ch_id_64[2];
uint32_t cinfo_ch_id_32[4];
uuid_t cinfo_ch_id; /* Channel UUID */
};
#ifdef KERNEL
#define cinfo_ch_token cinfo_ch_id_32[0]
#endif /* KERNEL */
uint32_t cinfo_ch_mode; /* CHMODE_* flags */
ring_id_t cinfo_ch_ring_id; /* Channel ring (or any) */
struct nxprov_params cinfo_nxprov_params; /* Nexus provider params */
uuid_t cinfo_nx_uuid; /* Nexus instance UUID */
nexus_port_t cinfo_nx_port; /* Nexus instance port */
uint32_t cinfo_num_bufs; /* # buffers in user pool */
mach_vm_size_t cinfo_mem_map_size; /* size of VM map */
mach_vm_address_t cinfo_mem_base; /* VM mapping for task */
mach_vm_offset_t cinfo_schema_offset; /* offset in VM map */
ring_id_t cinfo_first_tx_ring; /* first TX ring ID */
ring_id_t cinfo_last_tx_ring; /* last TX ring ID */
ring_id_t cinfo_first_rx_ring; /* first RX ring ID */
ring_id_t cinfo_last_rx_ring; /* last RX ring ID */
struct ch_ev_thresh cinfo_tx_lowat; /* TX low-watermark */
struct ch_ev_thresh cinfo_rx_lowat; /* RX low-watermark */
} __attribute__((aligned(sizeof(uint64_t))));
#include <skywalk/os_nexus_private.h>
#define CHANNEL_INIT_VERSION_1 1
#define CHANNEL_INIT_CURRENT_VERSION CHANNEL_INIT_VERSION_1
/*
* Channel init parameters.
*/
struct ch_init {
uint32_t ci_version; /* in: CHANNEL_INIT_CURRENT_VERSION */
uint32_t ci_ch_mode; /* in: CHMODE_* flags */
ring_id_t ci_ch_ring_id; /* in: Channel ring */
nexus_port_t ci_nx_port; /* in: Nexus instance port */
uuid_t ci_nx_uuid; /* in: Nexus instance UUID */
user_addr_t ci_key; /* in: key blob */
uint32_t ci_key_len; /* in: key length */
uint32_t __ci_align; /* reserved */
struct ch_ev_thresh ci_tx_lowat; /* in: TX low-watermark */
struct ch_ev_thresh ci_rx_lowat; /* in: RX low-watermark */
guardid_t ci_guard; /* out: guard ID */
};
#define CHMODE_MONITOR_TX 0x00000001
#define CHMODE_MONITOR_RX 0x00000002
#define CHMODE_MONITOR_NO_COPY 0x00000004 /* only if mon tx/rx is set */
#define CHMODE_USER_PACKET_POOL 0x00000008
#define CHMODE_DEFUNCT_OK 0x00000010
#define CHMODE_FILTER 0x00000020 /* packet filter channel */
#define CHMODE_EVENT_RING 0x00000040
#define CHMODE_LOW_LATENCY 0x00000080
#define CHMODE_EXCLUSIVE 0x00000200
#define CHMODE_MONITOR \
(CHMODE_MONITOR_TX | CHMODE_MONITOR_RX)
#ifdef KERNEL
/* mask off userland-settable bits */
#define CHMODE_MASK \
(CHMODE_MONITOR | CHMODE_MONITOR_NO_COPY | \
CHMODE_USER_PACKET_POOL | CHMODE_FILTER | \
CHMODE_DEFUNCT_OK | CHMODE_EVENT_RING | CHMODE_EXCLUSIVE | \
CHMODE_LOW_LATENCY)
#define CHMODE_KERNEL 0x00001000 /* special, in-kernel */
#define CHMODE_NO_NXREF 0x00002000 /* does not hold nx refcnt */
#define CHMODE_CONFIG 0x00004000 /* provider config mode */
#define CHMODE_HOST 0x00008000 /* to host (kernel) stack */
#define CHMODE_BITS \
"\020\01MON_TX\02MON_RX\03NO_COPY\04USER_PKT_POOL" \
"\05DEFUNCT_OK\06FILTER\07EVENT_RING\010LOW_LATENCY\012EXCLUSIVE" \
"\015KERNEL\016NO_NXREF\017CONFIG\020HOST"
#endif /* KERNEL */
/*
* Channel options.
*/
#define CHOPT_TX_LOWAT_THRESH 1 /* (get/set) ch_ev_thresh */
#define CHOPT_RX_LOWAT_THRESH 2 /* (get/set) ch_ev_thresh */
#define CHOPT_IF_ADV_CONF 3 /* (set) enable/disable interface advisory events on the channel */
#ifndef KERNEL
/*
* Channel ring descriptor.
*/
struct channel_ring_desc {
const struct channel *chrd_channel;
const volatile uint32_t *chrd_csm_flags;
const struct __user_channel_ring *chrd_ring;
/*
* Array of __slot_desc each representing slot-specific data.
* There is exactly one descriptor for each slot in the ring.
*/
struct __slot_desc *chrd_slot_desc;
/* local per-ring copies for easy access */
const nexus_meta_type_t chrd_md_type;
const nexus_meta_subtype_t chrd_md_subtype;
const mach_vm_address_t chrd_shmem_base_addr;
const mach_vm_address_t chrd_def_buf_base_addr;
const mach_vm_address_t chrd_large_buf_base_addr;
const mach_vm_address_t chrd_md_base_addr;
const mach_vm_address_t chrd_sd_base_addr;
const mach_vm_address_t chrd_bft_base_addr;
const uint32_t chrd_max_bufs; /* max length of buflet chain */
} __attribute__((aligned(sizeof(uint64_t))));
/*
* Channel descriptor.
*/
struct channel {
int chd_fd;
sync_flags_t chd_sync_flags;
guardid_t chd_guard;
struct ch_info *chd_info;
const volatile struct __user_channel_schema *chd_schema;
const volatile void *chd_nx_stats;
const volatile struct __flowadv_entry *chd_nx_flowadv;
const volatile struct __kern_nexus_adv_metadata *chd_nx_adv;
const nexus_meta_type_t chd_md_type;
const nexus_meta_subtype_t chd_md_subtype;
const uint8_t chd_alloc_ring_idx;
const uint8_t chd_free_ring_idx;
const uint8_t chd_buf_alloc_ring_idx;
const uint8_t chd_buf_free_ring_idx;
const uint8_t chd_large_buf_alloc_ring_idx;
#if defined(LIBSYSCALL_INTERFACE)
#define CHD_RING_IDX_NONE (uint8_t)-1
#endif /* LIBSYSCALL_INTERFACE */
/*
* Per-ring descriptor, aligned at max cache line boundary
*/
struct channel_ring_desc chd_rings[0]
__attribute__((aligned(sizeof(uint64_t))));
};
#define CHD_SIZE(n) \
((size_t)(&((struct channel *)0)->chd_rings[n]))
#define CHD_INFO_SIZE (sizeof (struct ch_info))
#define CHD_INFO(_chd) ((_chd)->chd_info)
#define CHD_PARAMS(_chd) (&CHD_INFO(_chd)->cinfo_nxprov_params)
#define CHD_SCHEMA(_chd) \
(__DECONST(struct __user_channel_schema *, (_chd)->chd_schema))
#define CHD_NX_STATS(_chd) \
(__DECONST(void *, (_chd)->chd_nx_stats))
#define CHD_NX_FLOWADV(_chd) \
(__DECONST(struct __flowadv_entry *, (_chd)->chd_nx_flowadv))
#define CHD_NX_ADV_MD(_chd) __DECONST(struct __kern_nexus_adv_metadata *, \
((_chd)->chd_nx_adv))
#define CHD_NX_ADV_NETIF(_adv_md) \
(struct netif_nexus_advisory *)(void *)(_adv_md + 1)
#define CHD_NX_ADV_FSW(_adv_md) (struct sk_nexusadv *)(void *)(_adv_md + 1)
/*
* Channel attributes.
*/
struct channel_attr {
uint32_t cha_tx_rings;
uint32_t cha_rx_rings;
uint32_t cha_tx_slots;
uint32_t cha_rx_slots;
uint32_t cha_buf_size;
uint32_t cha_meta_size;
uint32_t cha_stats_size;
uint32_t cha_exclusive;
uint32_t cha_monitor;
uint32_t cha_key_len;
void *cha_key;
struct ch_ev_thresh cha_tx_lowat;
struct ch_ev_thresh cha_rx_lowat;
uint32_t cha_nexus_type;
uint32_t cha_nexus_extensions;
uint32_t cha_nexus_mhints;
uint32_t cha_nexus_ifindex;
uint32_t cha_flowadv_max;
nexus_meta_type_t cha_nexus_meta_type;
nexus_meta_subtype_t cha_nexus_meta_subtype;
uint32_t cha_nexus_checksum_offload;
uint32_t cha_user_packet_pool;
uint32_t cha_nexusadv_size;
uint32_t cha_nexus_defunct_ok;
uint32_t cha_filter;
uint32_t cha_enable_event_ring;
uint32_t cha_max_frags;
uint32_t cha_num_buffers;
uint32_t cha_low_latency;
uint32_t cha_large_buf_size;
};
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
__BEGIN_DECLS
extern int __channel_open(struct ch_init *init, const uint32_t init_len);
extern int __channel_get_info(int c, struct ch_info *cinfo,
const uint32_t cinfolen);
extern int __channel_sync(int c, const int mode, const sync_flags_t flags);
extern int __channel_get_opt(int c, const uint32_t opt, void *aoptval,
uint32_t *aoptlen);
extern int __channel_set_opt(int c, const uint32_t opt, const void *aoptval,
const uint32_t optlen);
__END_DECLS
#endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
#endif /* !KERNEL */
#endif /* PRIVATE || BSD_KERNEL_PRIVATE */
#endif /* !_SKYWALK_OS_CHANNEL_PRIVATE_H_ */
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