cregit-Linux how code gets into the kernel

Release 4.11 drivers/infiniband/core/ud_header.c

/*
 * 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.
 */

#include <linux/errno.h>
#include <linux/string.h>
#include <linux/export.h>
#include <linux/if_ether.h>
#include <linux/ip.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 eth_table[]  = {
	{ STRUCT_FIELD(eth, dmac_h),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ STRUCT_FIELD(eth, dmac_l),
	  .offset_words = 1,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ STRUCT_FIELD(eth, smac_h),
	  .offset_words = 1,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ STRUCT_FIELD(eth, smac_l),
	  .offset_words = 2,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ STRUCT_FIELD(eth, type),
	  .offset_words = 3,
	  .offset_bits  = 0,
	  .size_bits    = 16 }
};


static const struct ib_field vlan_table[]  = {
	{ STRUCT_FIELD(vlan, tag),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ STRUCT_FIELD(vlan, type),
	  .offset_words = 0,
	  .offset_bits  = 16,
	  .size_bits    = 16 }
};


static const struct ib_field ip4_table[]  = {
	{ STRUCT_FIELD(ip4, ver),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 4 },
	{ STRUCT_FIELD(ip4, hdr_len),
	  .offset_words = 0,
	  .offset_bits  = 4,
	  .size_bits    = 4 },
	{ STRUCT_FIELD(ip4, tos),
	  .offset_words = 0,
	  .offset_bits  = 8,
	  .size_bits    = 8 },
	{ STRUCT_FIELD(ip4, tot_len),
	  .offset_words = 0,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ STRUCT_FIELD(ip4, id),
	  .offset_words = 1,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ STRUCT_FIELD(ip4, frag_off),
	  .offset_words = 1,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ STRUCT_FIELD(ip4, ttl),
	  .offset_words = 2,
	  .offset_bits  = 0,
	  .size_bits    = 8 },
	{ STRUCT_FIELD(ip4, protocol),
	  .offset_words = 2,
	  .offset_bits  = 8,
	  .size_bits    = 8 },
	{ STRUCT_FIELD(ip4, check),
	  .offset_words = 2,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ STRUCT_FIELD(ip4, saddr),
	  .offset_words = 3,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ STRUCT_FIELD(ip4, daddr),
	  .offset_words = 4,
	  .offset_bits  = 0,
	  .size_bits    = 32 }
};


static const struct ib_field udp_table[]  = {
	{ STRUCT_FIELD(udp, sport),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ STRUCT_FIELD(udp, dport),
	  .offset_words = 0,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ STRUCT_FIELD(udp, length),
	  .offset_words = 1,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ STRUCT_FIELD(udp, csum),
	  .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 }
};


__sum16 ib_ud_ip4_csum(struct ib_ud_header *header) { struct iphdr iph; iph.ihl = 5; iph.version = 4; iph.tos = header->ip4.tos; iph.tot_len = header->ip4.tot_len; iph.id = header->ip4.id; iph.frag_off = header->ip4.frag_off; iph.ttl = header->ip4.ttl; iph.protocol = header->ip4.protocol; iph.check = 0; iph.saddr = header->ip4.saddr; iph.daddr = header->ip4.daddr; return ip_fast_csum((u8 *)&iph, iph.ihl); }

Contributors

PersonTokensPropCommitsCommitProp
Moni Shoua127100.00%2100.00%
Total127100.00%2100.00%

EXPORT_SYMBOL(ib_ud_ip4_csum); /** * ib_ud_header_init - Initialize UD header structure * @payload_bytes:Length of packet payload * @lrh_present: specify if LRH is present * @eth_present: specify if Eth header is present * @vlan_present: packet is tagged vlan * @grh_present: GRH flag (if non-zero, GRH will be included) * @ip_version: if non-zero, IP header, V4 or V6, will be included * @udp_present :if non-zero, UDP header will be included * @immediate_present: specify if immediate data is present * @header:Structure to initialize */
int ib_ud_header_init(int payload_bytes, int lrh_present, int eth_present, int vlan_present, int grh_present, int ip_version, int udp_present, int immediate_present, struct ib_ud_header *header) { size_t udp_bytes = udp_present ? IB_UDP_BYTES : 0; grh_present = grh_present && !ip_version; memset(header, 0, sizeof *header); /* * UDP header without IP header doesn't make sense */ if (udp_present && ip_version != 4 && ip_version != 6) return -EINVAL; if (lrh_present) { u16 packet_length; 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 + (grh_present ? IB_GRH_BYTES : 0) + payload_bytes + 4 + /* ICRC */ 3) / 4; /* round up */ header->lrh.packet_length = cpu_to_be16(packet_length); } if (vlan_present) header->eth.type = cpu_to_be16(ETH_P_8021Q); if (ip_version == 6 || grh_present) { header->grh.ip_version = 6; header->grh.payload_length = cpu_to_be16((udp_bytes + IB_BTH_BYTES + IB_DETH_BYTES + payload_bytes + 4 + /* ICRC */ 3) & ~3); /* round up */ header->grh.next_header = udp_present ? IPPROTO_UDP : 0x1b; } if (ip_version == 4) { header->ip4.ver = 4; /* version 4 */ header->ip4.hdr_len = 5; /* 5 words */ header->ip4.tot_len = cpu_to_be16(IB_IP4_BYTES + udp_bytes + IB_BTH_BYTES + IB_DETH_BYTES + payload_bytes + 4); /* ICRC */ header->ip4.protocol = IPPROTO_UDP; } if (udp_present && ip_version) header->udp.length = cpu_to_be16(IB_UDP_BYTES + IB_BTH_BYTES + IB_DETH_BYTES + payload_bytes + 4); /* ICRC */ if (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; header->lrh_present = lrh_present; header->eth_present = eth_present; header->vlan_present = vlan_present; header->grh_present = grh_present || (ip_version == 6); header->ipv4_present = ip_version == 4; header->udp_present = udp_present; header->immediate_present = immediate_present; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Roland Dreier15839.80%116.67%
Moni Shoua15539.04%233.33%
Eli Cohen8421.16%350.00%
Total397100.00%6100.00%

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; if (header->lrh_present) { ib_pack(lrh_table, ARRAY_SIZE(lrh_table), &header->lrh, buf + len); len += IB_LRH_BYTES; } if (header->eth_present) { ib_pack(eth_table, ARRAY_SIZE(eth_table), &header->eth, buf + len); len += IB_ETH_BYTES; } if (header->vlan_present) { ib_pack(vlan_table, ARRAY_SIZE(vlan_table), &header->vlan, buf + len); len += IB_VLAN_BYTES; } if (header->grh_present) { ib_pack(grh_table, ARRAY_SIZE(grh_table), &header->grh, buf + len); len += IB_GRH_BYTES; } if (header->ipv4_present) { ib_pack(ip4_table, ARRAY_SIZE(ip4_table), &header->ip4, buf + len); len += IB_IP4_BYTES; } if (header->udp_present) { ib_pack(udp_table, ARRAY_SIZE(udp_table), &header->udp, buf + len); len += IB_UDP_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; }

Contributors

PersonTokensPropCommitsCommitProp
Roland Dreier15253.15%125.00%
Eli Cohen7225.17%250.00%
Moni Shoua6221.68%125.00%
Total286100.00%4100.00%

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) { pr_warn("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) { pr_warn("Invalid GRH.ip_version %d\n", header->grh.ip_version); return -EINVAL; } if (header->grh.next_header != 0x1b) { pr_warn("Invalid GRH.next_header 0x%02x\n", header->grh.next_header); return -EINVAL; } break; default: pr_warn("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: pr_warn("Invalid BTH.opcode 0x%02x\n", header->bth.opcode); return -EINVAL; } if (header->bth.transport_header_version != 0) { pr_warn("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; }

Contributors

PersonTokensPropCommitsCommitProp
Roland Dreier31698.14%150.00%
Parav Pandit61.86%150.00%
Total322100.00%2100.00%

EXPORT_SYMBOL(ib_ud_header_unpack);

Overall Contributors

PersonTokensPropCommitsCommitProp
Roland Dreier141556.53%325.00%
Moni Shoua73729.44%325.00%
Eli Cohen33913.54%325.00%
Parav Pandit60.24%18.33%
Tim Schmielau30.12%18.33%
Paul Gortmaker30.12%18.33%
Total2503100.00%12100.00%
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