drivers/net/ethernet/mellanox/mlx5/core/fpga/ipsec.c

   1 /*
   2  * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33
  34 #include <linux/rhashtable.h>
  35 #include <linux/mlx5/driver.h>
  36 #include <linux/mlx5/fs_helpers.h>
  37 #include <linux/mlx5/fs.h>
  38 #include <linux/rbtree.h>
  39
  40 #include "mlx5_core.h"
  41 #include "fs_cmd.h"
  42 #include "fpga/ipsec.h"
  43 #include "fpga/sdk.h"
  44 #include "fpga/core.h"
  45
  46 enum mlx5_fpga_ipsec_cmd_status {
  47         MLX5_FPGA_IPSEC_CMD_PENDING,
  48         MLX5_FPGA_IPSEC_CMD_SEND_FAIL,
  49         MLX5_FPGA_IPSEC_CMD_COMPLETE,
  50 };
  51
  52 struct mlx5_fpga_ipsec_cmd_context {
  53         struct mlx5_fpga_dma_buf buf;
  54         enum mlx5_fpga_ipsec_cmd_status status;
  55         struct mlx5_ifc_fpga_ipsec_cmd_resp resp;
  56         int status_code;
  57         struct completion complete;
  58         struct mlx5_fpga_device *dev;
  59         struct list_head list; /* Item in pending_cmds */
  60         u8 command[0];
  61 };
  62
  63 struct mlx5_fpga_esp_xfrm;
  64
  65 struct mlx5_fpga_ipsec_sa_ctx {
  66         struct rhash_head               hash;
  67         struct mlx5_ifc_fpga_ipsec_sa   hw_sa;
  68         struct mlx5_core_dev            *dev;
  69         struct mlx5_fpga_esp_xfrm       *fpga_xfrm;
  70 };
  71
  72 struct mlx5_fpga_esp_xfrm {
  73         unsigned int                    num_rules;
  74         struct mlx5_fpga_ipsec_sa_ctx   *sa_ctx;
  75         struct mutex                    lock; /* xfrm lock */
  76         struct mlx5_accel_esp_xfrm      accel_xfrm;
  77 };
  78
  79 struct mlx5_fpga_ipsec_rule {
  80         struct rb_node                  node;
  81         struct fs_fte                   *fte;
  82         struct mlx5_fpga_ipsec_sa_ctx   *ctx;
  83 };
  84
  85 static const struct rhashtable_params rhash_sa = {
  86         /* Keep out "cmd" field from the key as it's
  87          * value is not constant during the lifetime
  88          * of the key object.
  89          */
  90         .key_len = FIELD_SIZEOF(struct mlx5_fpga_ipsec_sa_ctx, hw_sa) -
  91                    FIELD_SIZEOF(struct mlx5_ifc_fpga_ipsec_sa_v1, cmd),
  92         .key_offset = offsetof(struct mlx5_fpga_ipsec_sa_ctx, hw_sa) +
  93                       FIELD_SIZEOF(struct mlx5_ifc_fpga_ipsec_sa_v1, cmd),
  94         .head_offset = offsetof(struct mlx5_fpga_ipsec_sa_ctx, hash),
  95         .automatic_shrinking = true,
  96         .min_size = 1,
  97 };
  98
  99 struct mlx5_fpga_ipsec {
 100         struct mlx5_fpga_device *fdev;
 101         struct list_head pending_cmds;
 102         spinlock_t pending_cmds_lock; /* Protects pending_cmds */
 103         u32 caps[MLX5_ST_SZ_DW(ipsec_extended_cap)];
 104         struct mlx5_fpga_conn *conn;
 105
 106         struct notifier_block   fs_notifier_ingress_bypass;
 107         struct notifier_block   fs_notifier_egress;
 108
 109         /* Map hardware SA           -->  SA context
 110          *     (mlx5_fpga_ipsec_sa)       (mlx5_fpga_ipsec_sa_ctx)
 111          * We will use this hash to avoid SAs duplication in fpga which
 112          * aren't allowed
 113          */
 114         struct rhashtable sa_hash;      /* hw_sa -> mlx5_fpga_ipsec_sa_ctx */
 115         struct mutex sa_hash_lock;
 116
 117         /* Tree holding all rules for this fpga device
 118          * Key for searching a rule (mlx5_fpga_ipsec_rule) is (ft, id)
 119          */
 120         struct rb_root rules_rb;
 121         struct mutex rules_rb_lock; /* rules lock */
 122 };
 123
 124 static bool mlx5_fpga_is_ipsec_device(struct mlx5_core_dev *mdev)
 125 {
 126         if (!mdev->fpga || !MLX5_CAP_GEN(mdev, fpga))
 127                 return false;
 128
 129         if (MLX5_CAP_FPGA(mdev, ieee_vendor_id) !=
 130             MLX5_FPGA_CAP_SANDBOX_VENDOR_ID_MLNX)
 131                 return false;
 132
 133         if (MLX5_CAP_FPGA(mdev, sandbox_product_id) !=
 134             MLX5_FPGA_CAP_SANDBOX_PRODUCT_ID_IPSEC)
 135                 return false;
 136
 137         return true;
 138 }
 139
 140 static void mlx5_fpga_ipsec_send_complete(struct mlx5_fpga_conn *conn,
 141                                           struct mlx5_fpga_device *fdev,
 142                                           struct mlx5_fpga_dma_buf *buf,
 143                                           u8 status)
 144 {
 145         struct mlx5_fpga_ipsec_cmd_context *context;
 146
 147         if (status) {
 148                 context = container_of(buf, struct mlx5_fpga_ipsec_cmd_context,
 149                                        buf);
 150                 mlx5_fpga_warn(fdev, "IPSec command send failed with status %u\n",
 151                                status);
 152                 context->status = MLX5_FPGA_IPSEC_CMD_SEND_FAIL;
 153                 complete(&context->complete);
 154         }
 155 }
 156
 157 static inline
 158 int syndrome_to_errno(enum mlx5_ifc_fpga_ipsec_response_syndrome syndrome)
 159 {
 160         switch (syndrome) {
 161         case MLX5_FPGA_IPSEC_RESPONSE_SUCCESS:
 162                 return 0;
 163         case MLX5_FPGA_IPSEC_RESPONSE_SADB_ISSUE:
 164                 return -EEXIST;
 165         case MLX5_FPGA_IPSEC_RESPONSE_ILLEGAL_REQUEST:
 166                 return -EINVAL;
 167         case MLX5_FPGA_IPSEC_RESPONSE_WRITE_RESPONSE_ISSUE:
 168                 return -EIO;
 169         }
 170         return -EIO;
 171 }
 172
 173 static void mlx5_fpga_ipsec_recv(void *cb_arg, struct mlx5_fpga_dma_buf *buf)
 174 {
 175         struct mlx5_ifc_fpga_ipsec_cmd_resp *resp = buf->sg[0].data;
 176         struct mlx5_fpga_ipsec_cmd_context *context;
 177         enum mlx5_ifc_fpga_ipsec_response_syndrome syndrome;
 178         struct mlx5_fpga_device *fdev = cb_arg;
 179         unsigned long flags;
 180
 181         if (buf->sg[0].size < sizeof(*resp)) {
 182                 mlx5_fpga_warn(fdev, "Short receive from FPGA IPSec: %u < %zu bytes\n",
 183                                buf->sg[0].size, sizeof(*resp));
 184                 return;
 185         }
 186
 187         mlx5_fpga_dbg(fdev, "mlx5_ipsec recv_cb syndrome %08x\n",
 188                       ntohl(resp->syndrome));
 189
 190         spin_lock_irqsave(&fdev->ipsec->pending_cmds_lock, flags);
 191         context = list_first_entry_or_null(&fdev->ipsec->pending_cmds,
 192                                            struct mlx5_fpga_ipsec_cmd_context,
 193                                            list);
 194         if (context)
 195                 list_del(&context->list);
 196         spin_unlock_irqrestore(&fdev->ipsec->pending_cmds_lock, flags);
 197
 198         if (!context) {
 199                 mlx5_fpga_warn(fdev, "Received IPSec offload response without pending command request\n");
 200                 return;
 201         }
 202         mlx5_fpga_dbg(fdev, "Handling response for %p\n", context);
 203
 204         syndrome = ntohl(resp->syndrome);
 205         context->status_code = syndrome_to_errno(syndrome);
 206         context->status = MLX5_FPGA_IPSEC_CMD_COMPLETE;
 207         memcpy(&context->resp, resp, sizeof(*resp));
 208
 209         if (context->status_code)
 210                 mlx5_fpga_warn(fdev, "IPSec command failed with syndrome %08x\n",
 211                                syndrome);
 212
 213         complete(&context->complete);
 214 }
 215
 216 static void *mlx5_fpga_ipsec_cmd_exec(struct mlx5_core_dev *mdev,
 217                                       const void *cmd, int cmd_size)
 218 {
 219         struct mlx5_fpga_ipsec_cmd_context *context;
 220         struct mlx5_fpga_device *fdev = mdev->fpga;
 221         unsigned long flags;
 222         int res;
 223
 224         if (!fdev || !fdev->ipsec)
 225                 return ERR_PTR(-EOPNOTSUPP);
 226
 227         if (cmd_size & 3)
 228                 return ERR_PTR(-EINVAL);
 229
 230         context = kzalloc(sizeof(*context) + cmd_size, GFP_ATOMIC);
 231         if (!context)
 232                 return ERR_PTR(-ENOMEM);
 233
 234         context->status = MLX5_FPGA_IPSEC_CMD_PENDING;
 235         context->dev = fdev;
 236         context->buf.complete = mlx5_fpga_ipsec_send_complete;
 237         init_completion(&context->complete);
 238         memcpy(&context->command, cmd, cmd_size);
 239         context->buf.sg[0].size = cmd_size;
 240         context->buf.sg[0].data = &context->command;
 241
 242         spin_lock_irqsave(&fdev->ipsec->pending_cmds_lock, flags);
 243         res = mlx5_fpga_sbu_conn_sendmsg(fdev->ipsec->conn, &context->buf);
 244         if (!res)
 245                 list_add_tail(&context->list, &fdev->ipsec->pending_cmds);
 246         spin_unlock_irqrestore(&fdev->ipsec->pending_cmds_lock, flags);
 247
 248         if (res) {
 249                 mlx5_fpga_warn(fdev, "Failed to send IPSec command: %d\n", res);
 250                 kfree(context);
 251                 return ERR_PTR(res);
 252         }
 253
 254         /* Context should be freed by the caller after completion. */
 255         return context;
 256 }
 257
 258 static int mlx5_fpga_ipsec_cmd_wait(void *ctx)
 259 {
 260         struct mlx5_fpga_ipsec_cmd_context *context = ctx;
 261         unsigned long timeout =
 262                 msecs_to_jiffies(MLX5_FPGA_CMD_TIMEOUT_MSEC);
 263         int res;
 264
 265         res = wait_for_completion_timeout(&context->complete, timeout);
 266         if (!res) {
 267                 mlx5_fpga_warn(context->dev, "Failure waiting for IPSec command response\n");
 268                 return -ETIMEDOUT;
 269         }
 270
 271         if (context->status == MLX5_FPGA_IPSEC_CMD_COMPLETE)
 272                 res = context->status_code;
 273         else
 274                 res = -EIO;
 275
 276         return res;
 277 }
 278
 279 static inline bool is_v2_sadb_supported(struct mlx5_fpga_ipsec *fipsec)
 280 {
 281         if (MLX5_GET(ipsec_extended_cap, fipsec->caps, v2_command))
 282                 return true;
 283         return false;
 284 }
 285
 286 static int mlx5_fpga_ipsec_update_hw_sa(struct mlx5_fpga_device *fdev,
 287                                         struct mlx5_ifc_fpga_ipsec_sa *hw_sa,
 288                                         int opcode)
 289 {
 290         struct mlx5_core_dev *dev = fdev->mdev;
 291         struct mlx5_ifc_fpga_ipsec_sa *sa;
 292         struct mlx5_fpga_ipsec_cmd_context *cmd_context;
 293         size_t sa_cmd_size;
 294         int err;
 295
 296         hw_sa->ipsec_sa_v1.cmd = htonl(opcode);
 297         if (is_v2_sadb_supported(fdev->ipsec))
 298                 sa_cmd_size = sizeof(*hw_sa);
 299         else
 300                 sa_cmd_size = sizeof(hw_sa->ipsec_sa_v1);
 301
 302         cmd_context = (struct mlx5_fpga_ipsec_cmd_context *)
 303                         mlx5_fpga_ipsec_cmd_exec(dev, hw_sa, sa_cmd_size);
 304         if (IS_ERR(cmd_context))
 305                 return PTR_ERR(cmd_context);
 306
 307         err = mlx5_fpga_ipsec_cmd_wait(cmd_context);
 308         if (err)
 309                 goto out;
 310
 311         sa = (struct mlx5_ifc_fpga_ipsec_sa *)&cmd_context->command;
 312         if (sa->ipsec_sa_v1.sw_sa_handle != cmd_context->resp.sw_sa_handle) {
 313                 mlx5_fpga_err(fdev, "mismatch SA handle. cmd 0x%08x vs resp 0x%08x\n",
 314                               ntohl(sa->ipsec_sa_v1.sw_sa_handle),
 315                               ntohl(cmd_context->resp.sw_sa_handle));
 316                 err = -EIO;
 317         }
 318
 319 out:
 320         kfree(cmd_context);
 321         return err;
 322 }
 323
 324 u32 mlx5_fpga_ipsec_device_caps(struct mlx5_core_dev *mdev)
 325 {
 326         struct mlx5_fpga_device *fdev = mdev->fpga;
 327         u32 ret = 0;
 328
 329         if (mlx5_fpga_is_ipsec_device(mdev)) {
 330                 ret |= MLX5_ACCEL_IPSEC_CAP_DEVICE;
 331                 ret |= MLX5_ACCEL_IPSEC_CAP_REQUIRED_METADATA;
 332         } else {
 333                 return ret;
 334         }
 335
 336         if (!fdev->ipsec)
 337                 return ret;
 338
 339         if (MLX5_GET(ipsec_extended_cap, fdev->ipsec->caps, esp))
 340                 ret |= MLX5_ACCEL_IPSEC_CAP_ESP;
 341
 342         if (MLX5_GET(ipsec_extended_cap, fdev->ipsec->caps, ipv6))
 343                 ret |= MLX5_ACCEL_IPSEC_CAP_IPV6;
 344
 345         if (MLX5_GET(ipsec_extended_cap, fdev->ipsec->caps, lso))
 346                 ret |= MLX5_ACCEL_IPSEC_CAP_LSO;
 347
 348         if (MLX5_GET(ipsec_extended_cap, fdev->ipsec->caps, rx_no_trailer))
 349                 ret |= MLX5_ACCEL_IPSEC_CAP_RX_NO_TRAILER;
 350
 351         if (MLX5_GET(ipsec_extended_cap, fdev->ipsec->caps, esn)) {
 352                 ret |= MLX5_ACCEL_IPSEC_CAP_ESN;
 353                 ret |= MLX5_ACCEL_IPSEC_CAP_TX_IV_IS_ESN;
 354         }
 355
 356         return ret;
 357 }
 358
 359 unsigned int mlx5_fpga_ipsec_counters_count(struct mlx5_core_dev *mdev)
 360 {
 361         struct mlx5_fpga_device *fdev = mdev->fpga;
 362
 363         if (!fdev || !fdev->ipsec)
 364                 return 0;
 365
 366         return MLX5_GET(ipsec_extended_cap, fdev->ipsec->caps,
 367                         number_of_ipsec_counters);
 368 }
 369
 370 int mlx5_fpga_ipsec_counters_read(struct mlx5_core_dev *mdev, u64 *counters,
 371                                   unsigned int counters_count)
 372 {
 373         struct mlx5_fpga_device *fdev = mdev->fpga;
 374         unsigned int i;
 375         __be32 *data;
 376         u32 count;
 377         u64 addr;
 378         int ret;
 379
 380         if (!fdev || !fdev->ipsec)
 381                 return 0;
 382
 383         addr = (u64)MLX5_GET(ipsec_extended_cap, fdev->ipsec->caps,
 384                              ipsec_counters_addr_low) +
 385                ((u64)MLX5_GET(ipsec_extended_cap, fdev->ipsec->caps,
 386                              ipsec_counters_addr_high) << 32);
 387
 388         count = mlx5_fpga_ipsec_counters_count(mdev);
 389
 390         data = kzalloc(array3_size(sizeof(*data), count, 2), GFP_KERNEL);
 391         if (!data) {
 392                 ret = -ENOMEM;
 393                 goto out;
 394         }
 395
 396         ret = mlx5_fpga_mem_read(fdev, count * sizeof(u64), addr, data,
 397                                  MLX5_FPGA_ACCESS_TYPE_DONTCARE);
 398         if (ret < 0) {
 399                 mlx5_fpga_err(fdev, "Failed to read IPSec counters from HW: %d\n",
 400                               ret);
 401                 goto out;
 402         }
 403         ret = 0;
 404
 405         if (count > counters_count)
 406                 count = counters_count;
 407
 408         /* Each counter is low word, then high. But each word is big-endian */
 409         for (i = 0; i < count; i++)
 410                 counters[i] = (u64)ntohl(data[i * 2]) |
 411                               ((u64)ntohl(data[i * 2 + 1]) << 32);
 412
 413 out:
 414         kfree(data);
 415         return ret;
 416 }
 417
 418 static int mlx5_fpga_ipsec_set_caps(struct mlx5_core_dev *mdev, u32 flags)
 419 {
 420         struct mlx5_fpga_ipsec_cmd_context *context;
 421         struct mlx5_ifc_fpga_ipsec_cmd_cap cmd = {0};
 422         int err;
 423
 424         cmd.cmd = htonl(MLX5_FPGA_IPSEC_CMD_OP_SET_CAP);
 425         cmd.flags = htonl(flags);
 426         context = mlx5_fpga_ipsec_cmd_exec(mdev, &cmd, sizeof(cmd));
 427         if (IS_ERR(context))
 428                 return PTR_ERR(context);
 429
 430         err = mlx5_fpga_ipsec_cmd_wait(context);
 431         if (err)
 432                 goto out;
 433
 434         if ((context->resp.flags & cmd.flags) != cmd.flags) {
 435                 mlx5_fpga_err(context->dev, "Failed to set capabilities. cmd 0x%08x vs resp 0x%08x\n",
 436                               cmd.flags,
 437                               context->resp.flags);
 438                 err = -EIO;
 439         }
 440
 441 out:
 442         kfree(context);
 443         return err;
 444 }
 445
 446 static int mlx5_fpga_ipsec_enable_supported_caps(struct mlx5_core_dev *mdev)
 447 {
 448         u32 dev_caps = mlx5_fpga_ipsec_device_caps(mdev);
 449         u32 flags = 0;
 450
 451         if (dev_caps & MLX5_ACCEL_IPSEC_CAP_RX_NO_TRAILER)
 452                 flags |= MLX5_FPGA_IPSEC_CAP_NO_TRAILER;
 453
 454         return mlx5_fpga_ipsec_set_caps(mdev, flags);
 455 }
 456
 457 static void
 458 mlx5_fpga_ipsec_build_hw_xfrm(struct mlx5_core_dev *mdev,
 459                               const struct mlx5_accel_esp_xfrm_attrs *xfrm_attrs,
 460                               struct mlx5_ifc_fpga_ipsec_sa *hw_sa)
 461 {
 462         const struct aes_gcm_keymat *aes_gcm = &xfrm_attrs->keymat.aes_gcm;
 463
 464         /* key */
 465         memcpy(&hw_sa->ipsec_sa_v1.key_enc, aes_gcm->aes_key,
 466                aes_gcm->key_len / 8);
 467         /* Duplicate 128 bit key twice according to HW layout */
 468         if (aes_gcm->key_len == 128)
 469                 memcpy(&hw_sa->ipsec_sa_v1.key_enc[16],
 470                        aes_gcm->aes_key, aes_gcm->key_len / 8);
 471
 472         /* salt and seq_iv */
 473         memcpy(&hw_sa->ipsec_sa_v1.gcm.salt_iv, &aes_gcm->seq_iv,
 474                sizeof(aes_gcm->seq_iv));
 475         memcpy(&hw_sa->ipsec_sa_v1.gcm.salt, &aes_gcm->salt,
 476                sizeof(aes_gcm->salt));
 477
 478         /* esn */
 479         if (xfrm_attrs->flags & MLX5_ACCEL_ESP_FLAGS_ESN_TRIGGERED) {
 480                 hw_sa->ipsec_sa_v1.flags |= MLX5_FPGA_IPSEC_SA_ESN_EN;
 481                 hw_sa->ipsec_sa_v1.flags |=
 482                                 (xfrm_attrs->flags &
 483                                  MLX5_ACCEL_ESP_FLAGS_ESN_STATE_OVERLAP) ?
 484                                         MLX5_FPGA_IPSEC_SA_ESN_OVERLAP : 0;
 485                 hw_sa->esn = htonl(xfrm_attrs->esn);
 486         } else {
 487                 hw_sa->ipsec_sa_v1.flags &= ~MLX5_FPGA_IPSEC_SA_ESN_EN;
 488                 hw_sa->ipsec_sa_v1.flags &=
 489                                 ~(xfrm_attrs->flags &
 490                                   MLX5_ACCEL_ESP_FLAGS_ESN_STATE_OVERLAP) ?
 491                                         MLX5_FPGA_IPSEC_SA_ESN_OVERLAP : 0;
 492                 hw_sa->esn = 0;
 493         }
 494
 495         /* rx handle */
 496         hw_sa->ipsec_sa_v1.sw_sa_handle = htonl(xfrm_attrs->sa_handle);
 497
 498         /* enc mode */
 499         switch (aes_gcm->key_len) {
 500         case 128:
 501                 hw_sa->ipsec_sa_v1.enc_mode =
 502                         MLX5_FPGA_IPSEC_SA_ENC_MODE_AES_GCM_128_AUTH_128;
 503                 break;
 504         case 256:
 505                 hw_sa->ipsec_sa_v1.enc_mode =
 506                         MLX5_FPGA_IPSEC_SA_ENC_MODE_AES_GCM_256_AUTH_128;
 507                 break;
 508         }
 509
 510         /* flags */
 511         hw_sa->ipsec_sa_v1.flags |= MLX5_FPGA_IPSEC_SA_SA_VALID |
 512                         MLX5_FPGA_IPSEC_SA_SPI_EN |
 513                         MLX5_FPGA_IPSEC_SA_IP_ESP;
 514
 515         if (xfrm_attrs->action & MLX5_ACCEL_ESP_ACTION_ENCRYPT)
 516                 hw_sa->ipsec_sa_v1.flags |= MLX5_FPGA_IPSEC_SA_DIR_SX;
 517         else
 518                 hw_sa->ipsec_sa_v1.flags &= ~MLX5_FPGA_IPSEC_SA_DIR_SX;
 519 }
 520
 521 static void
 522 mlx5_fpga_ipsec_build_hw_sa(struct mlx5_core_dev *mdev,
 523                             struct mlx5_accel_esp_xfrm_attrs *xfrm_attrs,
 524                             const __be32 saddr[4],
 525                             const __be32 daddr[4],
 526                             const __be32 spi, bool is_ipv6,
 527                             struct mlx5_ifc_fpga_ipsec_sa *hw_sa)
 528 {
 529         mlx5_fpga_ipsec_build_hw_xfrm(mdev, xfrm_attrs, hw_sa);
 530
 531         /* IPs */
 532         memcpy(hw_sa->ipsec_sa_v1.sip, saddr, sizeof(hw_sa->ipsec_sa_v1.sip));
 533         memcpy(hw_sa->ipsec_sa_v1.dip, daddr, sizeof(hw_sa->ipsec_sa_v1.dip));
 534
 535         /* SPI */
 536         hw_sa->ipsec_sa_v1.spi = spi;
 537
 538         /* flags */
 539         if (is_ipv6)
 540                 hw_sa->ipsec_sa_v1.flags |= MLX5_FPGA_IPSEC_SA_IPV6;
 541 }
 542
 543 static bool is_full_mask(const void *p, size_t len)
 544 {
 545         WARN_ON(len % 4);
 546
 547         return !memchr_inv(p, 0xff, len);
 548 }
 549
 550 static bool validate_fpga_full_mask(struct mlx5_core_dev *dev,
 551                                     const u32 *match_c,
 552                                     const u32 *match_v)
 553 {
 554         const void *misc_params_c = MLX5_ADDR_OF(fte_match_param,
 555                                                  match_c,
 556                                                  misc_parameters);
 557         const void *headers_c = MLX5_ADDR_OF(fte_match_param,
 558                                              match_c,
 559                                              outer_headers);
 560         const void *headers_v = MLX5_ADDR_OF(fte_match_param,
 561                                              match_v,
 562                                              outer_headers);
 563
 564         if (mlx5_fs_is_outer_ipv4_flow(dev, headers_c, headers_v)) {
 565                 const void *s_ipv4_c = MLX5_ADDR_OF(fte_match_set_lyr_2_4,
 566                                                     headers_c,
 567                                                     src_ipv4_src_ipv6.ipv4_layout.ipv4);
 568                 const void *d_ipv4_c = MLX5_ADDR_OF(fte_match_set_lyr_2_4,
 569                                                     headers_c,
 570                                                     dst_ipv4_dst_ipv6.ipv4_layout.ipv4);
 571
 572                 if (!is_full_mask(s_ipv4_c, MLX5_FLD_SZ_BYTES(ipv4_layout,
 573                                                               ipv4)) ||
 574                     !is_full_mask(d_ipv4_c, MLX5_FLD_SZ_BYTES(ipv4_layout,
 575                                                               ipv4)))
 576                         return false;
 577         } else {
 578                 const void *s_ipv6_c = MLX5_ADDR_OF(fte_match_set_lyr_2_4,
 579                                                     headers_c,
 580                                                     src_ipv4_src_ipv6.ipv6_layout.ipv6);
 581                 const void *d_ipv6_c = MLX5_ADDR_OF(fte_match_set_lyr_2_4,
 582                                                     headers_c,
 583                                                     dst_ipv4_dst_ipv6.ipv6_layout.ipv6);
 584
 585                 if (!is_full_mask(s_ipv6_c, MLX5_FLD_SZ_BYTES(ipv6_layout,
 586                                                               ipv6)) ||
 587                     !is_full_mask(d_ipv6_c, MLX5_FLD_SZ_BYTES(ipv6_layout,
 588                                                               ipv6)))
 589                         return false;
 590         }
 591
 592         if (!is_full_mask(MLX5_ADDR_OF(fte_match_set_misc, misc_params_c,
 593                                        outer_esp_spi),
 594                           MLX5_FLD_SZ_BYTES(fte_match_set_misc, outer_esp_spi)))
 595                 return false;
 596
 597         return true;
 598 }
 599
 600 static bool mlx5_is_fpga_ipsec_rule(struct mlx5_core_dev *dev,
 601                                     u8 match_criteria_enable,
 602                                     const u32 *match_c,
 603                                     const u32 *match_v)
 604 {
 605         u32 ipsec_dev_caps = mlx5_accel_ipsec_device_caps(dev);
 606         bool ipv6_flow;
 607
 608         ipv6_flow = mlx5_fs_is_outer_ipv6_flow(dev, match_c, match_v);
 609
 610         if (!(match_criteria_enable & MLX5_MATCH_OUTER_HEADERS) ||
 611             mlx5_fs_is_outer_udp_flow(match_c, match_v) ||
 612             mlx5_fs_is_outer_tcp_flow(match_c, match_v) ||
 613             mlx5_fs_is_vxlan_flow(match_c) ||
 614             !(mlx5_fs_is_outer_ipv4_flow(dev, match_c, match_v) ||
 615               ipv6_flow))
 616                 return false;
 617
 618         if (!(ipsec_dev_caps & MLX5_ACCEL_IPSEC_CAP_DEVICE))
 619                 return false;
 620
 621         if (!(ipsec_dev_caps & MLX5_ACCEL_IPSEC_CAP_ESP) &&
 622             mlx5_fs_is_outer_ipsec_flow(match_c))
 623                 return false;
 624
 625         if (!(ipsec_dev_caps & MLX5_ACCEL_IPSEC_CAP_IPV6) &&
 626             ipv6_flow)
 627                 return false;
 628
 629         if (!validate_fpga_full_mask(dev, match_c, match_v))
 630                 return false;
 631
 632         return true;
 633 }
 634
 635 static bool mlx5_is_fpga_egress_ipsec_rule(struct mlx5_core_dev *dev,
 636                                            u8 match_criteria_enable,
 637                                            const u32 *match_c,
 638                                            const u32 *match_v,
 639                                            struct mlx5_flow_act *flow_act,
 640                                            struct mlx5_flow_context *flow_context)
 641 {
 642         const void *outer_c = MLX5_ADDR_OF(fte_match_param, match_c,
 643                                            outer_headers);
 644         bool is_dmac = MLX5_GET(fte_match_set_lyr_2_4, outer_c, dmac_47_16) ||
 645                         MLX5_GET(fte_match_set_lyr_2_4, outer_c, dmac_15_0);
 646         bool is_smac = MLX5_GET(fte_match_set_lyr_2_4, outer_c, smac_47_16) ||
 647                         MLX5_GET(fte_match_set_lyr_2_4, outer_c, smac_15_0);
 648         int ret;
 649
 650         ret = mlx5_is_fpga_ipsec_rule(dev, match_criteria_enable, match_c,
 651                                       match_v);
 652         if (!ret)
 653                 return ret;
 654
 655         if (is_dmac || is_smac ||
 656             (match_criteria_enable &
 657              ~(MLX5_MATCH_OUTER_HEADERS | MLX5_MATCH_MISC_PARAMETERS)) ||
 658             (flow_act->action & ~(MLX5_FLOW_CONTEXT_ACTION_ENCRYPT | MLX5_FLOW_CONTEXT_ACTION_ALLOW)) ||
 659              (flow_context->flags & FLOW_CONTEXT_HAS_TAG))
 660                 return false;
 661
 662         return true;
 663 }
 664
 665 void *mlx5_fpga_ipsec_create_sa_ctx(struct mlx5_core_dev *mdev,
 666                                     struct mlx5_accel_esp_xfrm *accel_xfrm,
 667                                     const __be32 saddr[4],
 668                                     const __be32 daddr[4],
 669                                     const __be32 spi, bool is_ipv6)
 670 {
 671         struct mlx5_fpga_ipsec_sa_ctx *sa_ctx;
 672         struct mlx5_fpga_esp_xfrm *fpga_xfrm =
 673                         container_of(accel_xfrm, typeof(*fpga_xfrm),
 674                                      accel_xfrm);
 675         struct mlx5_fpga_device *fdev = mdev->fpga;
 676         struct mlx5_fpga_ipsec *fipsec = fdev->ipsec;
 677         int opcode, err;
 678         void *context;
 679
 680         /* alloc SA */
 681         sa_ctx = kzalloc(sizeof(*sa_ctx), GFP_KERNEL);
 682         if (!sa_ctx)
 683                 return ERR_PTR(-ENOMEM);
 684
 685         sa_ctx->dev = mdev;
 686
 687         /* build candidate SA */
 688         mlx5_fpga_ipsec_build_hw_sa(mdev, &accel_xfrm->attrs,
 689                                     saddr, daddr, spi, is_ipv6,
 690                                     &sa_ctx->hw_sa);
 691
 692         mutex_lock(&fpga_xfrm->lock);
 693
 694         if (fpga_xfrm->sa_ctx) {        /* multiple rules for same accel_xfrm */
 695                 /* all rules must be with same IPs and SPI */
 696                 if (memcmp(&sa_ctx->hw_sa, &fpga_xfrm->sa_ctx->hw_sa,
 697                            sizeof(sa_ctx->hw_sa))) {
 698                         context = ERR_PTR(-EINVAL);
 699                         goto exists;
 700                 }
 701
 702                 ++fpga_xfrm->num_rules;
 703                 context = fpga_xfrm->sa_ctx;
 704                 goto exists;
 705         }
 706
 707         /* This is unbounded fpga_xfrm, try to add to hash */
 708         mutex_lock(&fipsec->sa_hash_lock);
 709
 710         err = rhashtable_lookup_insert_fast(&fipsec->sa_hash, &sa_ctx->hash,
 711                                             rhash_sa);
 712         if (err) {
 713                 /* Can't bound different accel_xfrm to already existing sa_ctx.
 714                  * This is because we can't support multiple ketmats for
 715                  * same IPs and SPI
 716                  */
 717                 context = ERR_PTR(-EEXIST);
 718                 goto unlock_hash;
 719         }
 720
 721         /* Bound accel_xfrm to sa_ctx */
 722         opcode = is_v2_sadb_supported(fdev->ipsec) ?
 723                         MLX5_FPGA_IPSEC_CMD_OP_ADD_SA_V2 :
 724                         MLX5_FPGA_IPSEC_CMD_OP_ADD_SA;
 725         err = mlx5_fpga_ipsec_update_hw_sa(fdev, &sa_ctx->hw_sa, opcode);
 726         sa_ctx->hw_sa.ipsec_sa_v1.cmd = 0;
 727         if (err) {
 728                 context = ERR_PTR(err);
 729                 goto delete_hash;
 730         }
 731
 732         mutex_unlock(&fipsec->sa_hash_lock);
 733
 734         ++fpga_xfrm->num_rules;
 735         fpga_xfrm->sa_ctx = sa_ctx;
 736         sa_ctx->fpga_xfrm = fpga_xfrm;
 737
 738         mutex_unlock(&fpga_xfrm->lock);
 739
 740         return sa_ctx;
 741
 742 delete_hash:
 743         WARN_ON(rhashtable_remove_fast(&fipsec->sa_hash, &sa_ctx->hash,
 744                                        rhash_sa));
 745 unlock_hash:
 746         mutex_unlock(&fipsec->sa_hash_lock);
 747
 748 exists:
 749         mutex_unlock(&fpga_xfrm->lock);
 750         kfree(sa_ctx);
 751         return context;
 752 }
 753
 754 static void *
 755 mlx5_fpga_ipsec_fs_create_sa_ctx(struct mlx5_core_dev *mdev,
 756                                  struct fs_fte *fte,
 757                                  bool is_egress)
 758 {
 759         struct mlx5_accel_esp_xfrm *accel_xfrm;
 760         __be32 saddr[4], daddr[4], spi;
 761         struct mlx5_flow_group *fg;
 762         bool is_ipv6 = false;
 763
 764         fs_get_obj(fg, fte->node.parent);
 765         /* validate */
 766         if (is_egress &&
 767             !mlx5_is_fpga_egress_ipsec_rule(mdev,
 768                                             fg->mask.match_criteria_enable,
 769                                             fg->mask.match_criteria,
 770                                             fte->val,
 771                                             &fte->action,
 772                                             &fte->flow_context))
 773                 return ERR_PTR(-EINVAL);
 774         else if (!mlx5_is_fpga_ipsec_rule(mdev,
 775                                           fg->mask.match_criteria_enable,
 776                                           fg->mask.match_criteria,
 777                                           fte->val))
 778                 return ERR_PTR(-EINVAL);
 779
 780         /* get xfrm context */
 781         accel_xfrm =
 782                 (struct mlx5_accel_esp_xfrm *)fte->action.esp_id;
 783
 784         /* IPs */
 785         if (mlx5_fs_is_outer_ipv4_flow(mdev, fg->mask.match_criteria,
 786                                        fte->val)) {
 787                 memcpy(&saddr[3],
 788                        MLX5_ADDR_OF(fte_match_set_lyr_2_4,
 789                                     fte->val,
 790                                     src_ipv4_src_ipv6.ipv4_layout.ipv4),
 791                                     sizeof(saddr[3]));
 792                 memcpy(&daddr[3],
 793                        MLX5_ADDR_OF(fte_match_set_lyr_2_4,
 794                                     fte->val,
 795                                     dst_ipv4_dst_ipv6.ipv4_layout.ipv4),
 796                                     sizeof(daddr[3]));
 797         } else {
 798                 memcpy(saddr,
 799                        MLX5_ADDR_OF(fte_match_param,
 800                                     fte->val,
 801                                     outer_headers.src_ipv4_src_ipv6.ipv6_layout.ipv6),
 802                                     sizeof(saddr));
 803                 memcpy(daddr,
 804                        MLX5_ADDR_OF(fte_match_param,
 805                                     fte->val,
 806                                     outer_headers.dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
 807                                     sizeof(daddr));
 808                 is_ipv6 = true;
 809         }
 810
 811         /* SPI */
 812         spi = MLX5_GET_BE(typeof(spi),
 813                           fte_match_param, fte->val,
 814                           misc_parameters.outer_esp_spi);
 815
 816         /* create */
 817         return mlx5_fpga_ipsec_create_sa_ctx(mdev, accel_xfrm,
 818                                              saddr, daddr,
 819                                              spi, is_ipv6);
 820 }
 821
 822 static void
 823 mlx5_fpga_ipsec_release_sa_ctx(struct mlx5_fpga_ipsec_sa_ctx *sa_ctx)
 824 {
 825         struct mlx5_fpga_device *fdev = sa_ctx->dev->fpga;
 826         struct mlx5_fpga_ipsec *fipsec = fdev->ipsec;
 827         int opcode = is_v2_sadb_supported(fdev->ipsec) ?
 828                         MLX5_FPGA_IPSEC_CMD_OP_DEL_SA_V2 :
 829                         MLX5_FPGA_IPSEC_CMD_OP_DEL_SA;
 830         int err;
 831
 832         err = mlx5_fpga_ipsec_update_hw_sa(fdev, &sa_ctx->hw_sa, opcode);
 833         sa_ctx->hw_sa.ipsec_sa_v1.cmd = 0;
 834         if (err) {
 835                 WARN_ON(err);
 836                 return;
 837         }
 838
 839         mutex_lock(&fipsec->sa_hash_lock);
 840         WARN_ON(rhashtable_remove_fast(&fipsec->sa_hash, &sa_ctx->hash,
 841                                        rhash_sa));
 842         mutex_unlock(&fipsec->sa_hash_lock);
 843 }
 844
 845 void mlx5_fpga_ipsec_delete_sa_ctx(void *context)
 846 {
 847         struct mlx5_fpga_esp_xfrm *fpga_xfrm =
 848                         ((struct mlx5_fpga_ipsec_sa_ctx *)context)->fpga_xfrm;
 849
 850         mutex_lock(&fpga_xfrm->lock);
 851         if (!--fpga_xfrm->num_rules) {
 852                 mlx5_fpga_ipsec_release_sa_ctx(fpga_xfrm->sa_ctx);
 853                 fpga_xfrm->sa_ctx = NULL;
 854         }
 855         mutex_unlock(&fpga_xfrm->lock);
 856 }
 857
 858 static inline struct mlx5_fpga_ipsec_rule *
 859 _rule_search(struct rb_root *root, struct fs_fte *fte)
 860 {
 861         struct rb_node *node = root->rb_node;
 862
 863         while (node) {
 864                 struct mlx5_fpga_ipsec_rule *rule =
 865                                 container_of(node, struct mlx5_fpga_ipsec_rule,
 866                                              node);
 867
 868                 if (rule->fte < fte)
 869                         node = node->rb_left;
 870                 else if (rule->fte > fte)
 871                         node = node->rb_right;
 872                 else
 873                         return rule;
 874         }
 875         return NULL;
 876 }
 877
 878 static struct mlx5_fpga_ipsec_rule *
 879 rule_search(struct mlx5_fpga_ipsec *ipsec_dev, struct fs_fte *fte)
 880 {
 881         struct mlx5_fpga_ipsec_rule *rule;
 882
 883         mutex_lock(&ipsec_dev->rules_rb_lock);
 884         rule = _rule_search(&ipsec_dev->rules_rb, fte);
 885         mutex_unlock(&ipsec_dev->rules_rb_lock);
 886
 887         return rule;
 888 }
 889
 890 static inline int _rule_insert(struct rb_root *root,
 891                                struct mlx5_fpga_ipsec_rule *rule)
 892 {
 893         struct rb_node **new = &root->rb_node, *parent = NULL;
 894
 895         /* Figure out where to put new node */
 896         while (*new) {
 897                 struct mlx5_fpga_ipsec_rule *this =
 898                                 container_of(*new, struct mlx5_fpga_ipsec_rule,
 899                                              node);
 900
 901                 parent = *new;
 902                 if (rule->fte < this->fte)
 903                         new = &((*new)->rb_left);
 904                 else if (rule->fte > this->fte)
 905                         new = &((*new)->rb_right);
 906                 else
 907                         return -EEXIST;
 908         }
 909
 910         /* Add new node and rebalance tree. */
 911         rb_link_node(&rule->node, parent, new);
 912         rb_insert_color(&rule->node, root);
 913
 914         return 0;
 915 }
 916
 917 static int rule_insert(struct mlx5_fpga_ipsec *ipsec_dev,
 918                        struct mlx5_fpga_ipsec_rule *rule)
 919 {
 920         int ret;
 921
 922         mutex_lock(&ipsec_dev->rules_rb_lock);
 923         ret = _rule_insert(&ipsec_dev->rules_rb, rule);
 924         mutex_unlock(&ipsec_dev->rules_rb_lock);
 925
 926         return ret;
 927 }
 928
 929 static inline void _rule_delete(struct mlx5_fpga_ipsec *ipsec_dev,
 930                                 struct mlx5_fpga_ipsec_rule *rule)
 931 {
 932         struct rb_root *root = &ipsec_dev->rules_rb;
 933
 934         mutex_lock(&ipsec_dev->rules_rb_lock);
 935         rb_erase(&rule->node, root);
 936         mutex_unlock(&ipsec_dev->rules_rb_lock);
 937 }
 938
 939 static void rule_delete(struct mlx5_fpga_ipsec *ipsec_dev,
 940                         struct mlx5_fpga_ipsec_rule *rule)
 941 {
 942         _rule_delete(ipsec_dev, rule);
 943         kfree(rule);
 944 }
 945
 946 struct mailbox_mod {
 947         uintptr_t                       saved_esp_id;
 948         u32                             saved_action;
 949         u32                             saved_outer_esp_spi_value;
 950 };
 951
 952 static void restore_spec_mailbox(struct fs_fte *fte,
 953                                  struct mailbox_mod *mbox_mod)
 954 {
 955         char *misc_params_v = MLX5_ADDR_OF(fte_match_param,
 956                                            fte->val,
 957                                            misc_parameters);
 958
 959         MLX5_SET(fte_match_set_misc, misc_params_v, outer_esp_spi,
 960                  mbox_mod->saved_outer_esp_spi_value);
 961         fte->action.action |= mbox_mod->saved_action;
 962         fte->action.esp_id = (uintptr_t)mbox_mod->saved_esp_id;
 963 }
 964
 965 static void modify_spec_mailbox(struct mlx5_core_dev *mdev,
 966                                 struct fs_fte *fte,
 967                                 struct mailbox_mod *mbox_mod)
 968 {
 969         char *misc_params_v = MLX5_ADDR_OF(fte_match_param,
 970                                            fte->val,
 971                                            misc_parameters);
 972
 973         mbox_mod->saved_esp_id = fte->action.esp_id;
 974         mbox_mod->saved_action = fte->action.action &
 975                         (MLX5_FLOW_CONTEXT_ACTION_ENCRYPT |
 976                          MLX5_FLOW_CONTEXT_ACTION_DECRYPT);
 977         mbox_mod->saved_outer_esp_spi_value =
 978                         MLX5_GET(fte_match_set_misc, misc_params_v,
 979                                  outer_esp_spi);
 980
 981         fte->action.esp_id = 0;
 982         fte->action.action &= ~(MLX5_FLOW_CONTEXT_ACTION_ENCRYPT |
 983                                 MLX5_FLOW_CONTEXT_ACTION_DECRYPT);
 984         if (!MLX5_CAP_FLOWTABLE(mdev,
 985                                 flow_table_properties_nic_receive.ft_field_support.outer_esp_spi))
 986                 MLX5_SET(fte_match_set_misc, misc_params_v, outer_esp_spi, 0);
 987 }
 988
 989 static enum fs_flow_table_type egress_to_fs_ft(bool egress)
 990 {
 991         return egress ? FS_FT_NIC_TX : FS_FT_NIC_RX;
 992 }
 993
 994 static int fpga_ipsec_fs_create_flow_group(struct mlx5_flow_root_namespace *ns,
 995                                            struct mlx5_flow_table *ft,
 996                                            u32 *in,
 997                                            struct mlx5_flow_group *fg,
 998                                            bool is_egress)
 999 {
1000         int (*create_flow_group)(struct mlx5_flow_root_namespace *ns,
1001                                  struct mlx5_flow_table *ft, u32 *in,
1002                                  struct mlx5_flow_group *fg) =
1003                 mlx5_fs_cmd_get_default(egress_to_fs_ft(is_egress))->create_flow_group;
1004         char *misc_params_c = MLX5_ADDR_OF(create_flow_group_in, in,
1005                                            match_criteria.misc_parameters);
1006         struct mlx5_core_dev *dev = ns->dev;
1007         u32 saved_outer_esp_spi_mask;
1008         u8 match_criteria_enable;
1009         int ret;
1010
1011         if (MLX5_CAP_FLOWTABLE(dev,
1012                                flow_table_properties_nic_receive.ft_field_support.outer_esp_spi))
1013                 return create_flow_group(ns, ft, in, fg);
1014
1015         match_criteria_enable =
1016                 MLX5_GET(create_flow_group_in, in, match_criteria_enable);
1017         saved_outer_esp_spi_mask =
1018                 MLX5_GET(fte_match_set_misc, misc_params_c, outer_esp_spi);
1019         if (!match_criteria_enable || !saved_outer_esp_spi_mask)
1020                 return create_flow_group(ns, ft, in, fg);
1021
1022         MLX5_SET(fte_match_set_misc, misc_params_c, outer_esp_spi, 0);
1023
1024         if (!(*misc_params_c) &&
1025             !memcmp(misc_params_c, misc_params_c + 1, MLX5_ST_SZ_BYTES(fte_match_set_misc) - 1))
1026                 MLX5_SET(create_flow_group_in, in, match_criteria_enable,
1027                          match_criteria_enable & ~MLX5_MATCH_MISC_PARAMETERS);
1028
1029         ret = create_flow_group(ns, ft, in, fg);
1030
1031         MLX5_SET(fte_match_set_misc, misc_params_c, outer_esp_spi, saved_outer_esp_spi_mask);
1032         MLX5_SET(create_flow_group_in, in, match_criteria_enable, match_criteria_enable);
1033
1034         return ret;
1035 }
1036
1037 static int fpga_ipsec_fs_create_fte(struct mlx5_flow_root_namespace *ns,
1038                                     struct mlx5_flow_table *ft,
1039                                     struct mlx5_flow_group *fg,
1040                                     struct fs_fte *fte,
1041                                     bool is_egress)
1042 {
1043         int (*create_fte)(struct mlx5_flow_root_namespace *ns,
1044                           struct mlx5_flow_table *ft,
1045                           struct mlx5_flow_group *fg,
1046                           struct fs_fte *fte) =
1047                 mlx5_fs_cmd_get_default(egress_to_fs_ft(is_egress))->create_fte;
1048         struct mlx5_core_dev *dev = ns->dev;
1049         struct mlx5_fpga_device *fdev = dev->fpga;
1050         struct mlx5_fpga_ipsec *fipsec = fdev->ipsec;
1051         struct mlx5_fpga_ipsec_rule *rule;
1052         bool is_esp = fte->action.esp_id;
1053         struct mailbox_mod mbox_mod;
1054         int ret;
1055
1056         if (!is_esp ||
1057             !(fte->action.action &
1058               (MLX5_FLOW_CONTEXT_ACTION_ENCRYPT |
1059                MLX5_FLOW_CONTEXT_ACTION_DECRYPT)))
1060                 return create_fte(ns, ft, fg, fte);
1061
1062         rule = kzalloc(sizeof(*rule), GFP_KERNEL);
1063         if (!rule)
1064                 return -ENOMEM;
1065
1066         rule->ctx = mlx5_fpga_ipsec_fs_create_sa_ctx(dev, fte, is_egress);
1067         if (IS_ERR(rule->ctx)) {
1068                 int err = PTR_ERR(rule->ctx);
1069                 kfree(rule);
1070                 return err;
1071         }
1072
1073         rule->fte = fte;
1074         WARN_ON(rule_insert(fipsec, rule));
1075
1076         modify_spec_mailbox(dev, fte, &mbox_mod);
1077         ret = create_fte(ns, ft, fg, fte);
1078         restore_spec_mailbox(fte, &mbox_mod);
1079         if (ret) {
1080                 _rule_delete(fipsec, rule);
1081                 mlx5_fpga_ipsec_delete_sa_ctx(rule->ctx);
1082                 kfree(rule);
1083         }
1084
1085         return ret;
1086 }
1087
1088 static int fpga_ipsec_fs_update_fte(struct mlx5_flow_root_namespace *ns,
1089                                     struct mlx5_flow_table *ft,
1090                                     struct mlx5_flow_group *fg,
1091                                     int modify_mask,
1092                                     struct fs_fte *fte,
1093                                     bool is_egress)
1094 {
1095         int (*update_fte)(struct mlx5_flow_root_namespace *ns,
1096                           struct mlx5_flow_table *ft,
1097                           struct mlx5_flow_group *fg,
1098                           int modify_mask,
1099                           struct fs_fte *fte) =
1100                 mlx5_fs_cmd_get_default(egress_to_fs_ft(is_egress))->update_fte;
1101         struct mlx5_core_dev *dev = ns->dev;
1102         bool is_esp = fte->action.esp_id;
1103         struct mailbox_mod mbox_mod;
1104         int ret;
1105
1106         if (!is_esp ||
1107             !(fte->action.action &
1108               (MLX5_FLOW_CONTEXT_ACTION_ENCRYPT |
1109                MLX5_FLOW_CONTEXT_ACTION_DECRYPT)))
1110                 return update_fte(ns, ft, fg, modify_mask, fte);
1111
1112         modify_spec_mailbox(dev, fte, &mbox_mod);
1113         ret = update_fte(ns, ft, fg, modify_mask, fte);
1114         restore_spec_mailbox(fte, &mbox_mod);
1115
1116         return ret;
1117 }
1118
1119 static int fpga_ipsec_fs_delete_fte(struct mlx5_flow_root_namespace *ns,
1120                                     struct mlx5_flow_table *ft,
1121                                     struct fs_fte *fte,
1122                                     bool is_egress)
1123 {
1124         int (*delete_fte)(struct mlx5_flow_root_namespace *ns,
1125                           struct mlx5_flow_table *ft,
1126                           struct fs_fte *fte) =
1127                 mlx5_fs_cmd_get_default(egress_to_fs_ft(is_egress))->delete_fte;
1128         struct mlx5_core_dev *dev = ns->dev;
1129         struct mlx5_fpga_device *fdev = dev->fpga;
1130         struct mlx5_fpga_ipsec *fipsec = fdev->ipsec;
1131         struct mlx5_fpga_ipsec_rule *rule;
1132         bool is_esp = fte->action.esp_id;
1133         struct mailbox_mod mbox_mod;
1134         int ret;
1135
1136         if (!is_esp ||
1137             !(fte->action.action &
1138               (MLX5_FLOW_CONTEXT_ACTION_ENCRYPT |
1139                MLX5_FLOW_CONTEXT_ACTION_DECRYPT)))
1140                 return delete_fte(ns, ft, fte);
1141
1142         rule = rule_search(fipsec, fte);
1143         if (!rule)
1144                 return -ENOENT;
1145
1146         mlx5_fpga_ipsec_delete_sa_ctx(rule->ctx);
1147         rule_delete(fipsec, rule);
1148
1149         modify_spec_mailbox(dev, fte, &mbox_mod);
1150         ret = delete_fte(ns, ft, fte);
1151         restore_spec_mailbox(fte, &mbox_mod);
1152
1153         return ret;
1154 }
1155
1156 static int
1157 mlx5_fpga_ipsec_fs_create_flow_group_egress(struct mlx5_flow_root_namespace *ns,
1158                                             struct mlx5_flow_table *ft,
1159                                             u32 *in,
1160                                             struct mlx5_flow_group *fg)
1161 {
1162         return fpga_ipsec_fs_create_flow_group(ns, ft, in, fg, true);
1163 }
1164
1165 static int
1166 mlx5_fpga_ipsec_fs_create_fte_egress(struct mlx5_flow_root_namespace *ns,
1167                                      struct mlx5_flow_table *ft,
1168                                      struct mlx5_flow_group *fg,
1169                                      struct fs_fte *fte)
1170 {
1171         return fpga_ipsec_fs_create_fte(ns, ft, fg, fte, true);
1172 }
1173
1174 static int
1175 mlx5_fpga_ipsec_fs_update_fte_egress(struct mlx5_flow_root_namespace *ns,
1176                                      struct mlx5_flow_table *ft,
1177                                      struct mlx5_flow_group *fg,
1178                                      int modify_mask,
1179                                      struct fs_fte *fte)
1180 {
1181         return fpga_ipsec_fs_update_fte(ns, ft, fg, modify_mask, fte,
1182                                         true);
1183 }
1184
1185 static int
1186 mlx5_fpga_ipsec_fs_delete_fte_egress(struct mlx5_flow_root_namespace *ns,
1187                                      struct mlx5_flow_table *ft,
1188                                      struct fs_fte *fte)
1189 {
1190         return fpga_ipsec_fs_delete_fte(ns, ft, fte, true);
1191 }
1192
1193 static int
1194 mlx5_fpga_ipsec_fs_create_flow_group_ingress(struct mlx5_flow_root_namespace *ns,
1195                                              struct mlx5_flow_table *ft,
1196                                              u32 *in,
1197                                              struct mlx5_flow_group *fg)
1198 {
1199         return fpga_ipsec_fs_create_flow_group(ns, ft, in, fg, false);
1200 }
1201
1202 static int
1203 mlx5_fpga_ipsec_fs_create_fte_ingress(struct mlx5_flow_root_namespace *ns,
1204                                       struct mlx5_flow_table *ft,
1205                                       struct mlx5_flow_group *fg,
1206                                       struct fs_fte *fte)
1207 {
1208         return fpga_ipsec_fs_create_fte(ns, ft, fg, fte, false);
1209 }
1210
1211 static int
1212 mlx5_fpga_ipsec_fs_update_fte_ingress(struct mlx5_flow_root_namespace *ns,
1213                                       struct mlx5_flow_table *ft,
1214                                       struct mlx5_flow_group *fg,
1215                                       int modify_mask,
1216                                       struct fs_fte *fte)
1217 {
1218         return fpga_ipsec_fs_update_fte(ns, ft, fg, modify_mask, fte,
1219                                         false);
1220 }
1221
1222 static int
1223 mlx5_fpga_ipsec_fs_delete_fte_ingress(struct mlx5_flow_root_namespace *ns,
1224                                       struct mlx5_flow_table *ft,
1225                                       struct fs_fte *fte)
1226 {
1227         return fpga_ipsec_fs_delete_fte(ns, ft, fte, false);
1228 }
1229
1230 static struct mlx5_flow_cmds fpga_ipsec_ingress;
1231 static struct mlx5_flow_cmds fpga_ipsec_egress;
1232
1233 const struct mlx5_flow_cmds *mlx5_fs_cmd_get_default_ipsec_fpga_cmds(enum fs_flow_table_type type)
1234 {
1235         switch (type) {
1236         case FS_FT_NIC_RX:
1237                 return &fpga_ipsec_ingress;
1238         case FS_FT_NIC_TX:
1239                 return &fpga_ipsec_egress;
1240         default:
1241                 WARN_ON(true);
1242                 return NULL;
1243         }
1244 }
1245
1246 int mlx5_fpga_ipsec_init(struct mlx5_core_dev *mdev)
1247 {
1248         struct mlx5_fpga_conn_attr init_attr = {0};
1249         struct mlx5_fpga_device *fdev = mdev->fpga;
1250         struct mlx5_fpga_conn *conn;
1251         int err;
1252
1253         if (!mlx5_fpga_is_ipsec_device(mdev))
1254                 return 0;
1255
1256         fdev->ipsec = kzalloc(sizeof(*fdev->ipsec), GFP_KERNEL);
1257         if (!fdev->ipsec)
1258                 return -ENOMEM;
1259
1260         fdev->ipsec->fdev = fdev;
1261
1262         err = mlx5_fpga_get_sbu_caps(fdev, sizeof(fdev->ipsec->caps),
1263                                      fdev->ipsec->caps);
1264         if (err) {
1265                 mlx5_fpga_err(fdev, "Failed to retrieve IPSec extended capabilities: %d\n",
1266                               err);
1267                 goto error;
1268         }
1269
1270         INIT_LIST_HEAD(&fdev->ipsec->pending_cmds);
1271         spin_lock_init(&fdev->ipsec->pending_cmds_lock);
1272
1273         init_attr.rx_size = SBU_QP_QUEUE_SIZE;
1274         init_attr.tx_size = SBU_QP_QUEUE_SIZE;
1275         init_attr.recv_cb = mlx5_fpga_ipsec_recv;
1276         init_attr.cb_arg = fdev;
1277         conn = mlx5_fpga_sbu_conn_create(fdev, &init_attr);
1278         if (IS_ERR(conn)) {
1279                 err = PTR_ERR(conn);
1280                 mlx5_fpga_err(fdev, "Error creating IPSec command connection %d\n",
1281                               err);
1282                 goto error;
1283         }
1284         fdev->ipsec->conn = conn;
1285
1286         err = rhashtable_init(&fdev->ipsec->sa_hash, &rhash_sa);
1287         if (err)
1288                 goto err_destroy_conn;
1289         mutex_init(&fdev->ipsec->sa_hash_lock);
1290
1291         fdev->ipsec->rules_rb = RB_ROOT;
1292         mutex_init(&fdev->ipsec->rules_rb_lock);
1293
1294         err = mlx5_fpga_ipsec_enable_supported_caps(mdev);
1295         if (err) {
1296                 mlx5_fpga_err(fdev, "Failed to enable IPSec extended capabilities: %d\n",
1297                               err);
1298                 goto err_destroy_hash;
1299         }
1300
1301         return 0;
1302
1303 err_destroy_hash:
1304         rhashtable_destroy(&fdev->ipsec->sa_hash);
1305
1306 err_destroy_conn:
1307         mlx5_fpga_sbu_conn_destroy(conn);
1308
1309 error:
1310         kfree(fdev->ipsec);
1311         fdev->ipsec = NULL;
1312         return err;
1313 }
1314
1315 static void destroy_rules_rb(struct rb_root *root)
1316 {
1317         struct mlx5_fpga_ipsec_rule *r, *tmp;
1318
1319         rbtree_postorder_for_each_entry_safe(r, tmp, root, node) {
1320                 rb_erase(&r->node, root);
1321                 mlx5_fpga_ipsec_delete_sa_ctx(r->ctx);
1322                 kfree(r);
1323         }
1324 }
1325
1326 void mlx5_fpga_ipsec_cleanup(struct mlx5_core_dev *mdev)
1327 {
1328         struct mlx5_fpga_device *fdev = mdev->fpga;
1329
1330         if (!mlx5_fpga_is_ipsec_device(mdev))
1331                 return;
1332
1333         destroy_rules_rb(&fdev->ipsec->rules_rb);
1334         rhashtable_destroy(&fdev->ipsec->sa_hash);
1335
1336         mlx5_fpga_sbu_conn_destroy(fdev->ipsec->conn);
1337         kfree(fdev->ipsec);
1338         fdev->ipsec = NULL;
1339 }
1340
1341 void mlx5_fpga_ipsec_build_fs_cmds(void)
1342 {
1343         /* ingress */
1344         fpga_ipsec_ingress.create_flow_table =
1345                 mlx5_fs_cmd_get_default(egress_to_fs_ft(false))->create_flow_table;
1346         fpga_ipsec_ingress.destroy_flow_table =
1347                 mlx5_fs_cmd_get_default(egress_to_fs_ft(false))->destroy_flow_table;
1348         fpga_ipsec_ingress.modify_flow_table =
1349                 mlx5_fs_cmd_get_default(egress_to_fs_ft(false))->modify_flow_table;
1350         fpga_ipsec_ingress.create_flow_group =
1351                 mlx5_fpga_ipsec_fs_create_flow_group_ingress;
1352         fpga_ipsec_ingress.destroy_flow_group =
1353                  mlx5_fs_cmd_get_default(egress_to_fs_ft(false))->destroy_flow_group;
1354         fpga_ipsec_ingress.create_fte =
1355                 mlx5_fpga_ipsec_fs_create_fte_ingress;
1356         fpga_ipsec_ingress.update_fte =
1357                 mlx5_fpga_ipsec_fs_update_fte_ingress;
1358         fpga_ipsec_ingress.delete_fte =
1359                 mlx5_fpga_ipsec_fs_delete_fte_ingress;
1360         fpga_ipsec_ingress.update_root_ft =
1361                 mlx5_fs_cmd_get_default(egress_to_fs_ft(false))->update_root_ft;
1362
1363         /* egress */
1364         fpga_ipsec_egress.create_flow_table =
1365                 mlx5_fs_cmd_get_default(egress_to_fs_ft(true))->create_flow_table;
1366         fpga_ipsec_egress.destroy_flow_table =
1367                 mlx5_fs_cmd_get_default(egress_to_fs_ft(true))->destroy_flow_table;
1368         fpga_ipsec_egress.modify_flow_table =
1369                 mlx5_fs_cmd_get_default(egress_to_fs_ft(true))->modify_flow_table;
1370         fpga_ipsec_egress.create_flow_group =
1371                 mlx5_fpga_ipsec_fs_create_flow_group_egress;
1372         fpga_ipsec_egress.destroy_flow_group =
1373                 mlx5_fs_cmd_get_default(egress_to_fs_ft(true))->destroy_flow_group;
1374         fpga_ipsec_egress.create_fte =
1375                 mlx5_fpga_ipsec_fs_create_fte_egress;
1376         fpga_ipsec_egress.update_fte =
1377                 mlx5_fpga_ipsec_fs_update_fte_egress;
1378         fpga_ipsec_egress.delete_fte =
1379                 mlx5_fpga_ipsec_fs_delete_fte_egress;
1380         fpga_ipsec_egress.update_root_ft =
1381                 mlx5_fs_cmd_get_default(egress_to_fs_ft(true))->update_root_ft;
1382 }
1383
1384 static int
1385 mlx5_fpga_esp_validate_xfrm_attrs(struct mlx5_core_dev *mdev,
1386                                   const struct mlx5_accel_esp_xfrm_attrs *attrs)
1387 {
1388         if (attrs->tfc_pad) {
1389                 mlx5_core_err(mdev, "Cannot offload xfrm states with tfc padding\n");
1390                 return -EOPNOTSUPP;
1391         }
1392
1393         if (attrs->replay_type != MLX5_ACCEL_ESP_REPLAY_NONE) {
1394                 mlx5_core_err(mdev, "Cannot offload xfrm states with anti replay\n");
1395                 return -EOPNOTSUPP;
1396         }
1397
1398         if (attrs->keymat_type != MLX5_ACCEL_ESP_KEYMAT_AES_GCM) {
1399                 mlx5_core_err(mdev, "Only aes gcm keymat is supported\n");
1400                 return -EOPNOTSUPP;
1401         }
1402
1403         if (attrs->keymat.aes_gcm.iv_algo !=
1404             MLX5_ACCEL_ESP_AES_GCM_IV_ALGO_SEQ) {
1405                 mlx5_core_err(mdev, "Only iv sequence algo is supported\n");
1406                 return -EOPNOTSUPP;
1407         }
1408
1409         if (attrs->keymat.aes_gcm.icv_len != 128) {
1410                 mlx5_core_err(mdev, "Cannot offload xfrm states with AEAD ICV length other than 128bit\n");
1411                 return -EOPNOTSUPP;
1412         }
1413
1414         if (attrs->keymat.aes_gcm.key_len != 128 &&
1415             attrs->keymat.aes_gcm.key_len != 256) {
1416                 mlx5_core_err(mdev, "Cannot offload xfrm states with AEAD key length other than 128/256 bit\n");
1417                 return -EOPNOTSUPP;
1418         }
1419
1420         if ((attrs->flags & MLX5_ACCEL_ESP_FLAGS_ESN_TRIGGERED) &&
1421             (!MLX5_GET(ipsec_extended_cap, mdev->fpga->ipsec->caps,
1422                        v2_command))) {
1423                 mlx5_core_err(mdev, "Cannot offload xfrm states with AEAD key length other than 128/256 bit\n");
1424                 return -EOPNOTSUPP;
1425         }
1426
1427         return 0;
1428 }
1429
1430 struct mlx5_accel_esp_xfrm *
1431 mlx5_fpga_esp_create_xfrm(struct mlx5_core_dev *mdev,
1432                           const struct mlx5_accel_esp_xfrm_attrs *attrs,
1433                           u32 flags)
1434 {
1435         struct mlx5_fpga_esp_xfrm *fpga_xfrm;
1436
1437         if (!(flags & MLX5_ACCEL_XFRM_FLAG_REQUIRE_METADATA)) {
1438                 mlx5_core_warn(mdev, "Tried to create an esp action without metadata\n");
1439                 return ERR_PTR(-EINVAL);
1440         }
1441
1442         if (mlx5_fpga_esp_validate_xfrm_attrs(mdev, attrs)) {
1443                 mlx5_core_warn(mdev, "Tried to create an esp with unsupported attrs\n");
1444                 return ERR_PTR(-EOPNOTSUPP);
1445         }
1446
1447         fpga_xfrm = kzalloc(sizeof(*fpga_xfrm), GFP_KERNEL);
1448         if (!fpga_xfrm)
1449                 return ERR_PTR(-ENOMEM);
1450
1451         mutex_init(&fpga_xfrm->lock);
1452         memcpy(&fpga_xfrm->accel_xfrm.attrs, attrs,
1453                sizeof(fpga_xfrm->accel_xfrm.attrs));
1454
1455         return &fpga_xfrm->accel_xfrm;
1456 }
1457
1458 void mlx5_fpga_esp_destroy_xfrm(struct mlx5_accel_esp_xfrm *xfrm)
1459 {
1460         struct mlx5_fpga_esp_xfrm *fpga_xfrm =
1461                         container_of(xfrm, struct mlx5_fpga_esp_xfrm,
1462                                      accel_xfrm);
1463         /* assuming no sa_ctx are connected to this xfrm_ctx */
1464         kfree(fpga_xfrm);
1465 }
1466
1467 int mlx5_fpga_esp_modify_xfrm(struct mlx5_accel_esp_xfrm *xfrm,
1468                               const struct mlx5_accel_esp_xfrm_attrs *attrs)
1469 {
1470         struct mlx5_core_dev *mdev = xfrm->mdev;
1471         struct mlx5_fpga_device *fdev = mdev->fpga;
1472         struct mlx5_fpga_ipsec *fipsec = fdev->ipsec;
1473         struct mlx5_fpga_esp_xfrm *fpga_xfrm;
1474         struct mlx5_ifc_fpga_ipsec_sa org_hw_sa;
1475
1476         int err = 0;
1477
1478         if (!memcmp(&xfrm->attrs, attrs, sizeof(xfrm->attrs)))
1479                 return 0;
1480
1481         if (!mlx5_fpga_esp_validate_xfrm_attrs(mdev, attrs)) {
1482                 mlx5_core_warn(mdev, "Tried to create an esp with unsupported attrs\n");
1483                 return -EOPNOTSUPP;
1484         }
1485
1486         if (is_v2_sadb_supported(fipsec)) {
1487                 mlx5_core_warn(mdev, "Modify esp is not supported\n");
1488                 return -EOPNOTSUPP;
1489         }
1490
1491         fpga_xfrm = container_of(xfrm, struct mlx5_fpga_esp_xfrm, accel_xfrm);
1492
1493         mutex_lock(&fpga_xfrm->lock);
1494
1495         if (!fpga_xfrm->sa_ctx)
1496                 /* Unbounded xfrm, chane only sw attrs */
1497                 goto change_sw_xfrm_attrs;
1498
1499         /* copy original hw sa */
1500         memcpy(&org_hw_sa, &fpga_xfrm->sa_ctx->hw_sa, sizeof(org_hw_sa));
1501         mutex_lock(&fipsec->sa_hash_lock);
1502         /* remove original hw sa from hash */
1503         WARN_ON(rhashtable_remove_fast(&fipsec->sa_hash,
1504                                        &fpga_xfrm->sa_ctx->hash, rhash_sa));
1505         /* update hw_sa with new xfrm attrs*/
1506         mlx5_fpga_ipsec_build_hw_xfrm(xfrm->mdev, attrs,
1507                                       &fpga_xfrm->sa_ctx->hw_sa);
1508         /* try to insert new hw_sa to hash */
1509         err = rhashtable_insert_fast(&fipsec->sa_hash,
1510                                      &fpga_xfrm->sa_ctx->hash, rhash_sa);
1511         if (err)
1512                 goto rollback_sa;
1513
1514         /* modify device with new hw_sa */
1515         err = mlx5_fpga_ipsec_update_hw_sa(fdev, &fpga_xfrm->sa_ctx->hw_sa,
1516                                            MLX5_FPGA_IPSEC_CMD_OP_MOD_SA_V2);
1517         fpga_xfrm->sa_ctx->hw_sa.ipsec_sa_v1.cmd = 0;
1518         if (err)
1519                 WARN_ON(rhashtable_remove_fast(&fipsec->sa_hash,
1520                                                &fpga_xfrm->sa_ctx->hash,
1521                                                rhash_sa));
1522 rollback_sa:
1523         if (err) {
1524                 /* return original hw_sa to hash */
1525                 memcpy(&fpga_xfrm->sa_ctx->hw_sa, &org_hw_sa,
1526                        sizeof(org_hw_sa));
1527                 WARN_ON(rhashtable_insert_fast(&fipsec->sa_hash,
1528                                                &fpga_xfrm->sa_ctx->hash,
1529                                                rhash_sa));
1530         }
1531         mutex_unlock(&fipsec->sa_hash_lock);
1532
1533 change_sw_xfrm_attrs:
1534         if (!err)
1535                 memcpy(&xfrm->attrs, attrs, sizeof(xfrm->attrs));
1536         mutex_unlock(&fpga_xfrm->lock);
1537         return err;
1538 }