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linux/drivers/infiniband/core/ud_header.c

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/*
* Copyright (c) 2004 Topspin Corporation. All rights reserved.
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* $Id: ud_header.c 1349 2004-12-16 21:09:43Z roland $
*/
#include <linux/errno.h>
#include <linux/string.h>
#include <rdma/ib_pack.h>
#define STRUCT_FIELD(header, field) \
.struct_offset_bytes = offsetof(struct ib_unpacked_ ## header, field), \
.struct_size_bytes = sizeof ((struct ib_unpacked_ ## header *) 0)->field, \
.field_name = #header ":" #field
static const struct ib_field lrh_table[] = {
{ STRUCT_FIELD(lrh, virtual_lane),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 4 },
{ STRUCT_FIELD(lrh, link_version),
.offset_words = 0,
.offset_bits = 4,
.size_bits = 4 },
{ STRUCT_FIELD(lrh, service_level),
.offset_words = 0,
.offset_bits = 8,
.size_bits = 4 },
{ RESERVED,
.offset_words = 0,
.offset_bits = 12,
.size_bits = 2 },
{ STRUCT_FIELD(lrh, link_next_header),
.offset_words = 0,
.offset_bits = 14,
.size_bits = 2 },
{ STRUCT_FIELD(lrh, destination_lid),
.offset_words = 0,
.offset_bits = 16,
.size_bits = 16 },
{ RESERVED,
.offset_words = 1,
.offset_bits = 0,
.size_bits = 5 },
{ STRUCT_FIELD(lrh, packet_length),
.offset_words = 1,
.offset_bits = 5,
.size_bits = 11 },
{ STRUCT_FIELD(lrh, source_lid),
.offset_words = 1,
.offset_bits = 16,
.size_bits = 16 }
};
static const struct ib_field grh_table[] = {
{ STRUCT_FIELD(grh, ip_version),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 4 },
{ STRUCT_FIELD(grh, traffic_class),
.offset_words = 0,
.offset_bits = 4,
.size_bits = 8 },
{ STRUCT_FIELD(grh, flow_label),
.offset_words = 0,
.offset_bits = 12,
.size_bits = 20 },
{ STRUCT_FIELD(grh, payload_length),
.offset_words = 1,
.offset_bits = 0,
.size_bits = 16 },
{ STRUCT_FIELD(grh, next_header),
.offset_words = 1,
.offset_bits = 16,
.size_bits = 8 },
{ STRUCT_FIELD(grh, hop_limit),
.offset_words = 1,
.offset_bits = 24,
.size_bits = 8 },
{ STRUCT_FIELD(grh, source_gid),
.offset_words = 2,
.offset_bits = 0,
.size_bits = 128 },
{ STRUCT_FIELD(grh, destination_gid),
.offset_words = 6,
.offset_bits = 0,
.size_bits = 128 }
};
static const struct ib_field bth_table[] = {
{ STRUCT_FIELD(bth, opcode),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 8 },
{ STRUCT_FIELD(bth, solicited_event),
.offset_words = 0,
.offset_bits = 8,
.size_bits = 1 },
{ STRUCT_FIELD(bth, mig_req),
.offset_words = 0,
.offset_bits = 9,
.size_bits = 1 },
{ STRUCT_FIELD(bth, pad_count),
.offset_words = 0,
.offset_bits = 10,
.size_bits = 2 },
{ STRUCT_FIELD(bth, transport_header_version),
.offset_words = 0,
.offset_bits = 12,
.size_bits = 4 },
{ STRUCT_FIELD(bth, pkey),
.offset_words = 0,
.offset_bits = 16,
.size_bits = 16 },
{ RESERVED,
.offset_words = 1,
.offset_bits = 0,
.size_bits = 8 },
{ STRUCT_FIELD(bth, destination_qpn),
.offset_words = 1,
.offset_bits = 8,
.size_bits = 24 },
{ STRUCT_FIELD(bth, ack_req),
.offset_words = 2,
.offset_bits = 0,
.size_bits = 1 },
{ RESERVED,
.offset_words = 2,
.offset_bits = 1,
.size_bits = 7 },
{ STRUCT_FIELD(bth, psn),
.offset_words = 2,
.offset_bits = 8,
.size_bits = 24 }
};
static const struct ib_field deth_table[] = {
{ STRUCT_FIELD(deth, qkey),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 32 },
{ RESERVED,
.offset_words = 1,
.offset_bits = 0,
.size_bits = 8 },
{ STRUCT_FIELD(deth, source_qpn),
.offset_words = 1,
.offset_bits = 8,
.size_bits = 24 }
};
/**
* ib_ud_header_init - Initialize UD header structure
* @payload_bytes:Length of packet payload
* @grh_present:GRH flag (if non-zero, GRH will be included)
* @header:Structure to initialize
*
* ib_ud_header_init() initializes the lrh.link_version, lrh.link_next_header,
* lrh.packet_length, grh.ip_version, grh.payload_length,
* grh.next_header, bth.opcode, bth.pad_count and
* bth.transport_header_version fields of a &struct ib_ud_header given
* the payload length and whether a GRH will be included.
*/
void ib_ud_header_init(int payload_bytes,
int grh_present,
struct ib_ud_header *header)
{
int header_len;
u16 packet_length;
memset(header, 0, sizeof *header);
header_len =
IB_LRH_BYTES +
IB_BTH_BYTES +
IB_DETH_BYTES;
if (grh_present) {
header_len += IB_GRH_BYTES;
}
header->lrh.link_version = 0;
header->lrh.link_next_header =
grh_present ? IB_LNH_IBA_GLOBAL : IB_LNH_IBA_LOCAL;
packet_length = (IB_LRH_BYTES +
IB_BTH_BYTES +
IB_DETH_BYTES +
payload_bytes +
4 + /* ICRC */
3) / 4; /* round up */
header->grh_present = grh_present;
if (grh_present) {
packet_length += IB_GRH_BYTES / 4;
header->grh.ip_version = 6;
header->grh.payload_length =
cpu_to_be16((IB_BTH_BYTES +
IB_DETH_BYTES +
payload_bytes +
4 + /* ICRC */
3) & ~3); /* round up */
header->grh.next_header = 0x1b;
}
header->lrh.packet_length = cpu_to_be16(packet_length);
if (header->immediate_present)
header->bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
else
header->bth.opcode = IB_OPCODE_UD_SEND_ONLY;
header->bth.pad_count = (4 - payload_bytes) & 3;
header->bth.transport_header_version = 0;
}
EXPORT_SYMBOL(ib_ud_header_init);
/**
* ib_ud_header_pack - Pack UD header struct into wire format
* @header:UD header struct
* @buf:Buffer to pack into
*
* ib_ud_header_pack() packs the UD header structure @header into wire
* format in the buffer @buf.
*/
int ib_ud_header_pack(struct ib_ud_header *header,
void *buf)
{
int len = 0;
ib_pack(lrh_table, ARRAY_SIZE(lrh_table),
&header->lrh, buf);
len += IB_LRH_BYTES;
if (header->grh_present) {
ib_pack(grh_table, ARRAY_SIZE(grh_table),
&header->grh, buf + len);
len += IB_GRH_BYTES;
}
ib_pack(bth_table, ARRAY_SIZE(bth_table),
&header->bth, buf + len);
len += IB_BTH_BYTES;
ib_pack(deth_table, ARRAY_SIZE(deth_table),
&header->deth, buf + len);
len += IB_DETH_BYTES;
if (header->immediate_present) {
memcpy(buf + len, &header->immediate_data, sizeof header->immediate_data);
len += sizeof header->immediate_data;
}
return len;
}
EXPORT_SYMBOL(ib_ud_header_pack);
/**
* ib_ud_header_unpack - Unpack UD header struct from wire format
* @header:UD header struct
* @buf:Buffer to pack into
*
* ib_ud_header_pack() unpacks the UD header structure @header from wire
* format in the buffer @buf.
*/
int ib_ud_header_unpack(void *buf,
struct ib_ud_header *header)
{
ib_unpack(lrh_table, ARRAY_SIZE(lrh_table),
buf, &header->lrh);
buf += IB_LRH_BYTES;
if (header->lrh.link_version != 0) {
printk(KERN_WARNING "Invalid LRH.link_version %d\n",
header->lrh.link_version);
return -EINVAL;
}
switch (header->lrh.link_next_header) {
case IB_LNH_IBA_LOCAL:
header->grh_present = 0;
break;
case IB_LNH_IBA_GLOBAL:
header->grh_present = 1;
ib_unpack(grh_table, ARRAY_SIZE(grh_table),
buf, &header->grh);
buf += IB_GRH_BYTES;
if (header->grh.ip_version != 6) {
printk(KERN_WARNING "Invalid GRH.ip_version %d\n",
header->grh.ip_version);
return -EINVAL;
}
if (header->grh.next_header != 0x1b) {
printk(KERN_WARNING "Invalid GRH.next_header 0x%02x\n",
header->grh.next_header);
return -EINVAL;
}
break;
default:
printk(KERN_WARNING "Invalid LRH.link_next_header %d\n",
header->lrh.link_next_header);
return -EINVAL;
}
ib_unpack(bth_table, ARRAY_SIZE(bth_table),
buf, &header->bth);
buf += IB_BTH_BYTES;
switch (header->bth.opcode) {
case IB_OPCODE_UD_SEND_ONLY:
header->immediate_present = 0;
break;
case IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE:
header->immediate_present = 1;
break;
default:
printk(KERN_WARNING "Invalid BTH.opcode 0x%02x\n",
header->bth.opcode);
return -EINVAL;
}
if (header->bth.transport_header_version != 0) {
printk(KERN_WARNING "Invalid BTH.transport_header_version %d\n",
header->bth.transport_header_version);
return -EINVAL;
}
ib_unpack(deth_table, ARRAY_SIZE(deth_table),
buf, &header->deth);
buf += IB_DETH_BYTES;
if (header->immediate_present)
memcpy(&header->immediate_data, buf, sizeof header->immediate_data);
return 0;
}
EXPORT_SYMBOL(ib_ud_header_unpack);
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