drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32_parse.h

   1 /*
   2  * This file is part of the Chelsio T4 Ethernet driver for Linux.
   3  *
   4  * Copyright (c) 2016 Chelsio Communications, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #ifndef __CXGB4_TC_U32_PARSE_H
  36 #define __CXGB4_TC_U32_PARSE_H
  37
  38 struct cxgb4_match_field {
  39         int off; /* Offset from the beginning of the header to match */
  40         /* Fill the value/mask pair in the spec if matched */
  41         int (*val)(struct ch_filter_specification *f, __be32 val, __be32 mask);
  42 };
  43
  44 /* IPv4 match fields */
  45 static inline int cxgb4_fill_ipv4_tos(struct ch_filter_specification *f,
  46                                       __be32 val, __be32 mask)
  47 {
  48         f->val.tos  = (ntohl(val)  >> 16) & 0x000000FF;
  49         f->mask.tos = (ntohl(mask) >> 16) & 0x000000FF;
  50
  51         return 0;
  52 }
  53
  54 static inline int cxgb4_fill_ipv4_frag(struct ch_filter_specification *f,
  55                                        __be32 val, __be32 mask)
  56 {
  57         u32 mask_val;
  58         u8 frag_val;
  59
  60         frag_val = (ntohl(val) >> 13) & 0x00000007;
  61         mask_val = ntohl(mask) & 0x0000FFFF;
  62
  63         if (frag_val == 0x1 && mask_val != 0x3FFF) { /* MF set */
  64                 f->val.frag = 1;
  65                 f->mask.frag = 1;
  66         } else if (frag_val == 0x2 && mask_val != 0x3FFF) { /* DF set */
  67                 f->val.frag = 0;
  68                 f->mask.frag = 1;
  69         } else {
  70                 return -EINVAL;
  71         }
  72
  73         return 0;
  74 }
  75
  76 static inline int cxgb4_fill_ipv4_proto(struct ch_filter_specification *f,
  77                                         __be32 val, __be32 mask)
  78 {
  79         f->val.proto  = (ntohl(val)  >> 16) & 0x000000FF;
  80         f->mask.proto = (ntohl(mask) >> 16) & 0x000000FF;
  81
  82         return 0;
  83 }
  84
  85 static inline int cxgb4_fill_ipv4_src_ip(struct ch_filter_specification *f,
  86                                          __be32 val, __be32 mask)
  87 {
  88         memcpy(&f->val.fip[0],  &val,  sizeof(u32));
  89         memcpy(&f->mask.fip[0], &mask, sizeof(u32));
  90
  91         return 0;
  92 }
  93
  94 static inline int cxgb4_fill_ipv4_dst_ip(struct ch_filter_specification *f,
  95                                          __be32 val, __be32 mask)
  96 {
  97         memcpy(&f->val.lip[0],  &val,  sizeof(u32));
  98         memcpy(&f->mask.lip[0], &mask, sizeof(u32));
  99
 100         return 0;
 101 }
 102
 103 static const struct cxgb4_match_field cxgb4_ipv4_fields[] = {
 104         { .off = 0,  .val = cxgb4_fill_ipv4_tos },
 105         { .off = 4,  .val = cxgb4_fill_ipv4_frag },
 106         { .off = 8,  .val = cxgb4_fill_ipv4_proto },
 107         { .off = 12, .val = cxgb4_fill_ipv4_src_ip },
 108         { .off = 16, .val = cxgb4_fill_ipv4_dst_ip },
 109         { .val = NULL }
 110 };
 111
 112 /* IPv6 match fields */
 113 static inline int cxgb4_fill_ipv6_tos(struct ch_filter_specification *f,
 114                                       __be32 val, __be32 mask)
 115 {
 116         f->val.tos  = (ntohl(val)  >> 20) & 0x000000FF;
 117         f->mask.tos = (ntohl(mask) >> 20) & 0x000000FF;
 118
 119         return 0;
 120 }
 121
 122 static inline int cxgb4_fill_ipv6_proto(struct ch_filter_specification *f,
 123                                         __be32 val, __be32 mask)
 124 {
 125         f->val.proto  = (ntohl(val)  >> 8) & 0x000000FF;
 126         f->mask.proto = (ntohl(mask) >> 8) & 0x000000FF;
 127
 128         return 0;
 129 }
 130
 131 static inline int cxgb4_fill_ipv6_src_ip0(struct ch_filter_specification *f,
 132                                           __be32 val, __be32 mask)
 133 {
 134         memcpy(&f->val.fip[0],  &val,  sizeof(u32));
 135         memcpy(&f->mask.fip[0], &mask, sizeof(u32));
 136
 137         return 0;
 138 }
 139
 140 static inline int cxgb4_fill_ipv6_src_ip1(struct ch_filter_specification *f,
 141                                           __be32 val, __be32 mask)
 142 {
 143         memcpy(&f->val.fip[4],  &val,  sizeof(u32));
 144         memcpy(&f->mask.fip[4], &mask, sizeof(u32));
 145
 146         return 0;
 147 }
 148
 149 static inline int cxgb4_fill_ipv6_src_ip2(struct ch_filter_specification *f,
 150                                           __be32 val, __be32 mask)
 151 {
 152         memcpy(&f->val.fip[8],  &val,  sizeof(u32));
 153         memcpy(&f->mask.fip[8], &mask, sizeof(u32));
 154
 155         return 0;
 156 }
 157
 158 static inline int cxgb4_fill_ipv6_src_ip3(struct ch_filter_specification *f,
 159                                           __be32 val, __be32 mask)
 160 {
 161         memcpy(&f->val.fip[12],  &val,  sizeof(u32));
 162         memcpy(&f->mask.fip[12], &mask, sizeof(u32));
 163
 164         return 0;
 165 }
 166
 167 static inline int cxgb4_fill_ipv6_dst_ip0(struct ch_filter_specification *f,
 168                                           __be32 val, __be32 mask)
 169 {
 170         memcpy(&f->val.lip[0],  &val,  sizeof(u32));
 171         memcpy(&f->mask.lip[0], &mask, sizeof(u32));
 172
 173         return 0;
 174 }
 175
 176 static inline int cxgb4_fill_ipv6_dst_ip1(struct ch_filter_specification *f,
 177                                           __be32 val, __be32 mask)
 178 {
 179         memcpy(&f->val.lip[4],  &val,  sizeof(u32));
 180         memcpy(&f->mask.lip[4], &mask, sizeof(u32));
 181
 182         return 0;
 183 }
 184
 185 static inline int cxgb4_fill_ipv6_dst_ip2(struct ch_filter_specification *f,
 186                                           __be32 val, __be32 mask)
 187 {
 188         memcpy(&f->val.lip[8],  &val,  sizeof(u32));
 189         memcpy(&f->mask.lip[8], &mask, sizeof(u32));
 190
 191         return 0;
 192 }
 193
 194 static inline int cxgb4_fill_ipv6_dst_ip3(struct ch_filter_specification *f,
 195                                           __be32 val, __be32 mask)
 196 {
 197         memcpy(&f->val.lip[12],  &val,  sizeof(u32));
 198         memcpy(&f->mask.lip[12], &mask, sizeof(u32));
 199
 200         return 0;
 201 }
 202
 203 static const struct cxgb4_match_field cxgb4_ipv6_fields[] = {
 204         { .off = 0,  .val = cxgb4_fill_ipv6_tos },
 205         { .off = 4,  .val = cxgb4_fill_ipv6_proto },
 206         { .off = 8,  .val = cxgb4_fill_ipv6_src_ip0 },
 207         { .off = 12, .val = cxgb4_fill_ipv6_src_ip1 },
 208         { .off = 16, .val = cxgb4_fill_ipv6_src_ip2 },
 209         { .off = 20, .val = cxgb4_fill_ipv6_src_ip3 },
 210         { .off = 24, .val = cxgb4_fill_ipv6_dst_ip0 },
 211         { .off = 28, .val = cxgb4_fill_ipv6_dst_ip1 },
 212         { .off = 32, .val = cxgb4_fill_ipv6_dst_ip2 },
 213         { .off = 36, .val = cxgb4_fill_ipv6_dst_ip3 },
 214         { .val = NULL }
 215 };
 216
 217 /* TCP/UDP match */
 218 static inline int cxgb4_fill_l4_ports(struct ch_filter_specification *f,
 219                                       __be32 val, __be32 mask)
 220 {
 221         f->val.fport  = ntohl(val)  >> 16;
 222         f->mask.fport = ntohl(mask) >> 16;
 223         f->val.lport  = ntohl(val)  & 0x0000FFFF;
 224         f->mask.lport = ntohl(mask) & 0x0000FFFF;
 225
 226         return 0;
 227 };
 228
 229 static const struct cxgb4_match_field cxgb4_tcp_fields[] = {
 230         { .off = 0, .val = cxgb4_fill_l4_ports },
 231         { .val = NULL }
 232 };
 233
 234 static const struct cxgb4_match_field cxgb4_udp_fields[] = {
 235         { .off = 0, .val = cxgb4_fill_l4_ports },
 236         { .val = NULL }
 237 };
 238
 239 struct cxgb4_next_header {
 240         /* Offset, shift, and mask added to beginning of the header
 241          * to get to next header.  Useful when using a header
 242          * field's value to jump to next header such as IHL field
 243          * in IPv4 header.
 244          */
 245         struct tc_u32_sel sel;
 246         struct tc_u32_key key;
 247         /* location of jump to make */
 248         const struct cxgb4_match_field *jump;
 249 };
 250
 251 /* Accept a rule with a jump to transport layer header based on IHL field in
 252  * IPv4 header.
 253  */
 254 static const struct cxgb4_next_header cxgb4_ipv4_jumps[] = {
 255         {
 256                 /* TCP Jump */
 257                 .sel = {
 258                         .off = 0,
 259                         .offoff = 0,
 260                         .offshift = 6,
 261                         .offmask = cpu_to_be16(0x0f00),
 262                 },
 263                 .key = {
 264                         .off = 8,
 265                         .val = cpu_to_be32(0x00060000),
 266                         .mask = cpu_to_be32(0x00ff0000),
 267                 },
 268                 .jump = cxgb4_tcp_fields,
 269         },
 270         {
 271                 /* UDP Jump */
 272                 .sel = {
 273                         .off = 0,
 274                         .offoff = 0,
 275                         .offshift = 6,
 276                         .offmask = cpu_to_be16(0x0f00),
 277                 },
 278                 .key = {
 279                         .off = 8,
 280                         .val = cpu_to_be32(0x00110000),
 281                         .mask = cpu_to_be32(0x00ff0000),
 282                 },
 283                 .jump = cxgb4_udp_fields,
 284         },
 285         { .jump = NULL },
 286 };
 287
 288 /* Accept a rule with a jump directly past the 40 Bytes of IPv6 fixed header
 289  * to get to transport layer header.
 290  */
 291 static const struct cxgb4_next_header cxgb4_ipv6_jumps[] = {
 292         {
 293                 /* TCP Jump */
 294                 .sel = {
 295                         .off = 40,
 296                         .offoff = 0,
 297                         .offshift = 0,
 298                         .offmask = 0,
 299                 },
 300                 .key = {
 301                         .off = 4,
 302                         .val = cpu_to_be32(0x00000600),
 303                         .mask = cpu_to_be32(0x0000ff00),
 304                 },
 305                 .jump = cxgb4_tcp_fields,
 306         },
 307         {
 308                 /* UDP Jump */
 309                 .sel = {
 310                         .off = 40,
 311                         .offoff = 0,
 312                         .offshift = 0,
 313                         .offmask = 0,
 314                 },
 315                 .key = {
 316                         .off = 4,
 317                         .val = cpu_to_be32(0x00001100),
 318                         .mask = cpu_to_be32(0x0000ff00),
 319                 },
 320                 .jump = cxgb4_udp_fields,
 321         },
 322         { .jump = NULL },
 323 };
 324
 325 struct cxgb4_link {
 326         const struct cxgb4_match_field *match_field;  /* Next header */
 327         struct ch_filter_specification fs; /* Match spec associated with link */
 328         u32 link_handle;         /* Knode handle associated with the link */
 329         unsigned long *tid_map;  /* Bitmap for filter tids */
 330 };
 331
 332 struct cxgb4_tc_u32_table {
 333         unsigned int size;          /* number of entries in table */
 334         struct cxgb4_link table[]; /* Jump table */
 335 };
 336 #endif /* __CXGB4_TC_U32_PARSE_H */