ipsec.c

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/*
 * Copyright (c) 2016 Intel and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/api_errno.h>
#include <vnet/ipsec/ipsec.h>
#include <vlib/node_funcs.h>

#include <dpdk/device/dpdk.h>
#include <dpdk/ipsec/ipsec.h>
#include <dpdk/ipsec/esp.h>

#define DPDK_CRYPTO_NB_SESS_OBJS  20000
#define DPDK_CRYPTO_CACHE_SIZE    512
#define DPDK_CRYPTO_PRIV_SIZE     128
#define DPDK_CRYPTO_N_QUEUE_DESC  1024
#define DPDK_CRYPTO_NB_COPS       (1024 * 4)

static int
add_del_sa_sess (u32 sa_index, u8 is_add)
{
  dpdk_crypto_main_t *dcm = &dpdk_crypto_main;
  crypto_worker_main_t *cwm;
  u8 skip_master = vlib_num_workers () > 0;

  /* *INDENT-OFF* */
  vec_foreach (cwm, dcm->workers_main)
    {
      crypto_sa_session_t *sa_sess;
      u8 is_outbound;

      if (skip_master)
        {
          skip_master = 0;
          continue;
        }

      for (is_outbound = 0; is_outbound < 2; is_outbound++)
        {
          if (is_add)
            {
              pool_get (cwm->sa_sess_d[is_outbound], sa_sess);
            }
          else
            {
              u8 dev_id;

              sa_sess = pool_elt_at_index (cwm->sa_sess_d[is_outbound], sa_index);
              dev_id = cwm->qp_data[sa_sess->qp_index].dev_id;

              if (!sa_sess->sess)
                continue;

              if (rte_cryptodev_sym_session_free(dev_id, sa_sess->sess))
                {
                  clib_warning("failed to free session");
                  return -1;
                }
              memset(sa_sess, 0, sizeof(sa_sess[0]));
            }
        }
    }
  /* *INDENT-OFF* */

  return 0;
}

static void
update_qp_data (crypto_worker_main_t * cwm,
                u8 cdev_id, u16 qp_id, u8 is_outbound, u16 * idx)
{
  crypto_qp_data_t *qpd;

  /* *INDENT-OFF* */
  vec_foreach_index (*idx, cwm->qp_data)
    {
      qpd = vec_elt_at_index(cwm->qp_data, *idx);

      if (qpd->dev_id == cdev_id && qpd->qp_id == qp_id &&
          qpd->is_outbound == is_outbound)
          return;
    }
  /* *INDENT-ON* */

  vec_add2 (cwm->qp_data, qpd, 1);

  qpd->dev_id = cdev_id;
  qpd->qp_id = qp_id;
  qpd->is_outbound = is_outbound;
}

/*
 * return:
 *      0: already exist
 *      1: mapped
 */
static int
add_mapping (crypto_worker_main_t * cwm,
             u8 cdev_id, u16 qp, u8 is_outbound,
             const struct rte_cryptodev_capabilities *cipher_cap,
             const struct rte_cryptodev_capabilities *auth_cap)
{
  u16 qp_index;
  uword key = 0, data, *ret;
  crypto_worker_qp_key_t *p_key = (crypto_worker_qp_key_t *) & key;

  p_key->cipher_algo = (u8) cipher_cap->sym.cipher.algo;
  p_key->auth_algo = (u8) auth_cap->sym.auth.algo;
  p_key->is_outbound = is_outbound;

  ret = hash_get (cwm->algo_qp_map, key);
  if (ret)
    return 0;

  update_qp_data (cwm, cdev_id, qp, is_outbound, &qp_index);

  data = (uword) qp_index;
  hash_set (cwm->algo_qp_map, key, data);

  return 1;
}

/*
 * return:
 *      0: already exist
 *      1: mapped
 */
static int
add_cdev_mapping (crypto_worker_main_t * cwm,
                  struct rte_cryptodev_info *dev_info, u8 cdev_id,
                  u16 qp, u8 is_outbound)
{
  const struct rte_cryptodev_capabilities *i, *j;
  u32 mapped = 0;

  for (i = dev_info->capabilities; i->op != RTE_CRYPTO_OP_TYPE_UNDEFINED; i++)
    {
      if (i->sym.xform_type != RTE_CRYPTO_SYM_XFORM_CIPHER)
        continue;

      if (check_algo_is_supported (i, NULL) != 0)
        continue;

      for (j = dev_info->capabilities; j->op != RTE_CRYPTO_OP_TYPE_UNDEFINED;
           j++)
        {
          if (j->sym.xform_type != RTE_CRYPTO_SYM_XFORM_AUTH)
            continue;

          if (check_algo_is_supported (j, NULL) != 0)
            continue;

          mapped |= add_mapping (cwm, cdev_id, qp, is_outbound, i, j);
        }
    }

  return mapped;
}

static int
check_cryptodev_queues ()
{
  u32 n_qs = 0;
  u8 cdev_id;
  u32 n_req_qs = 2;

  if (vlib_num_workers () > 0)
    n_req_qs = vlib_num_workers () * 2;

  for (cdev_id = 0; cdev_id < rte_cryptodev_count (); cdev_id++)
    {
      struct rte_cryptodev_info cdev_info;

      rte_cryptodev_info_get (cdev_id, &cdev_info);

      if (!
          (cdev_info.feature_flags & RTE_CRYPTODEV_FF_SYM_OPERATION_CHAINING))
        continue;

      n_qs += cdev_info.max_nb_queue_pairs;
    }

  if (n_qs >= n_req_qs)
    return 0;
  else
    return -1;
}

static clib_error_t *
dpdk_ipsec_check_support (ipsec_sa_t * sa)
{
  if (sa->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128)
    {
      if (sa->integ_alg != IPSEC_INTEG_ALG_NONE)
        return clib_error_return (0, "unsupported integ-alg %U with "
                                  "crypto-algo aes-gcm-128",
                                  format_ipsec_integ_alg, sa->integ_alg);
      sa->integ_alg = IPSEC_INTEG_ALG_AES_GCM_128;
    }
  else
    {
      if (sa->integ_alg == IPSEC_INTEG_ALG_NONE ||
          sa->integ_alg == IPSEC_INTEG_ALG_AES_GCM_128)
        return clib_error_return (0, "unsupported integ-alg %U",
                                  format_ipsec_integ_alg, sa->integ_alg);
    }

  return 0;
}

static uword
dpdk_ipsec_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
                    vlib_frame_t * f)
{
  dpdk_config_main_t *conf = &dpdk_config_main;
  ipsec_main_t *im = &ipsec_main;
  dpdk_crypto_main_t *dcm = &dpdk_crypto_main;
  vlib_thread_main_t *tm = vlib_get_thread_main ();
  struct rte_cryptodev_config dev_conf;
  struct rte_cryptodev_qp_conf qp_conf;
  struct rte_cryptodev_info cdev_info;
  struct rte_mempool *rmp;
  i32 dev_id, ret;
  u32 i, skip_master;

  if (!conf->cryptodev)
    {
      clib_warning ("DPDK Cryptodev support is disabled, "
                    "default to OpenSSL IPsec");
      return 0;
    }

  if (check_cryptodev_queues () < 0)
    {
      conf->cryptodev = 0;
      clib_warning ("not enough Cryptodevs, default to OpenSSL IPsec");
      return 0;
    }

  vec_alloc (dcm->workers_main, tm->n_vlib_mains);
  _vec_len (dcm->workers_main) = tm->n_vlib_mains;

  fprintf (stdout, "DPDK Cryptodevs info:\n");
  fprintf (stdout, "dev_id\tn_qp\tnb_obj\tcache_size\n");
  /* HW cryptodevs have higher dev_id, use HW first */
  for (dev_id = rte_cryptodev_count () - 1; dev_id >= 0; dev_id--)
    {
      u16 max_nb_qp, qp = 0;
      skip_master = vlib_num_workers () > 0;

      rte_cryptodev_info_get (dev_id, &cdev_info);

      if (!
          (cdev_info.feature_flags & RTE_CRYPTODEV_FF_SYM_OPERATION_CHAINING))
        continue;

      max_nb_qp = cdev_info.max_nb_queue_pairs;

      for (i = 0; i < tm->n_vlib_mains; i++)
        {
          u8 is_outbound;
          crypto_worker_main_t *cwm;
          uword *map;

          if (skip_master)
            {
              skip_master = 0;
              continue;
            }

          cwm = vec_elt_at_index (dcm->workers_main, i);
          map = cwm->algo_qp_map;

          if (!map)
            {
              map = hash_create (0, sizeof (crypto_worker_qp_key_t));
              if (!map)
                {
                  clib_warning ("unable to create hash table for worker %u",
                                vlib_mains[i]->cpu_index);
                  goto error;
                }
              cwm->algo_qp_map = map;
            }

          for (is_outbound = 0; is_outbound < 2 && qp < max_nb_qp;
               is_outbound++)
            qp += add_cdev_mapping (cwm, &cdev_info, dev_id, qp, is_outbound);
        }

      if (qp == 0)
        continue;

      dev_conf.socket_id = rte_cryptodev_socket_id (dev_id);
      dev_conf.nb_queue_pairs = cdev_info.max_nb_queue_pairs;
      dev_conf.session_mp.nb_objs = DPDK_CRYPTO_NB_SESS_OBJS;
      dev_conf.session_mp.cache_size = DPDK_CRYPTO_CACHE_SIZE;

      ret = rte_cryptodev_configure (dev_id, &dev_conf);
      if (ret < 0)
        {
          clib_warning ("cryptodev %u config error", dev_id);
          goto error;
        }

      qp_conf.nb_descriptors = DPDK_CRYPTO_N_QUEUE_DESC;
      for (qp = 0; qp < dev_conf.nb_queue_pairs; qp++)
        {
          ret = rte_cryptodev_queue_pair_setup (dev_id, qp, &qp_conf,
                                                dev_conf.socket_id);
          if (ret < 0)
            {
              clib_warning ("cryptodev %u qp %u setup error", dev_id, qp);
              goto error;
            }
        }
      vec_validate_aligned (dcm->cop_pools, dev_conf.socket_id,
                            CLIB_CACHE_LINE_BYTES);

      if (!vec_elt (dcm->cop_pools, dev_conf.socket_id))
        {
          u8 *pool_name = format (0, "crypto_op_pool_socket%u%c",
                                  dev_conf.socket_id, 0);

          rmp = rte_crypto_op_pool_create ((char *) pool_name,
                                           RTE_CRYPTO_OP_TYPE_SYMMETRIC,
                                           DPDK_CRYPTO_NB_COPS *
                                           (1 + vlib_num_workers ()),
                                           DPDK_CRYPTO_CACHE_SIZE,
                                           DPDK_CRYPTO_PRIV_SIZE,
                                           dev_conf.socket_id);
          vec_free (pool_name);

          if (!rmp)
            {
              clib_warning ("failed to allocate mempool on socket %u",
                            dev_conf.socket_id);
              goto error;
            }
          vec_elt (dcm->cop_pools, dev_conf.socket_id) = rmp;
        }

      fprintf (stdout, "%u\t%u\t%u\t%u\n", dev_id, dev_conf.nb_queue_pairs,
               DPDK_CRYPTO_NB_SESS_OBJS, DPDK_CRYPTO_CACHE_SIZE);
    }

  dpdk_esp_init ();

  /* Add new next node and set as default */
  vlib_node_t *node, *next_node;

  next_node = vlib_get_node_by_name (vm, (u8 *) "dpdk-esp-encrypt");
  ASSERT (next_node);
  node = vlib_get_node_by_name (vm, (u8 *) "ipsec-output-ip4");
  ASSERT (node);
  im->esp_encrypt_node_index = next_node->index;
  im->esp_encrypt_next_index =
    vlib_node_add_next (vm, node->index, next_node->index);

  next_node = vlib_get_node_by_name (vm, (u8 *) "dpdk-esp-decrypt");
  ASSERT (next_node);
  node = vlib_get_node_by_name (vm, (u8 *) "ipsec-input-ip4");
  ASSERT (node);
  im->esp_decrypt_node_index = next_node->index;
  im->esp_decrypt_next_index =
    vlib_node_add_next (vm, node->index, next_node->index);

  im->cb.check_support_cb = dpdk_ipsec_check_support;
  im->cb.add_del_sa_sess_cb = add_del_sa_sess;

  for (i = 1; i < tm->n_vlib_mains; i++)
    vlib_node_set_state (vlib_mains[i], dpdk_crypto_input_node.index,
                         VLIB_NODE_STATE_POLLING);

  /* TODO cryptodev counters */

  return 0;

error:
  ;
  crypto_worker_main_t *cwm;
  struct rte_mempool **mp;
  /* *INDENT-OFF* */
  vec_foreach (cwm, dcm->workers_main)
    hash_free (cwm->algo_qp_map);

  vec_foreach (mp, dcm->cop_pools)
    {
      if (mp)
        rte_mempool_free (mp[0]);
    }
  /* *INDENT-ON* */
  vec_free (dcm->workers_main);
  vec_free (dcm->cop_pools);

  return 0;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (dpdk_ipsec_process_node,static) = {
    .function = dpdk_ipsec_process,
    .type = VLIB_NODE_TYPE_PROCESS,
    .name = "dpdk-ipsec-process",
    .process_log2_n_stack_bytes = 17,
};
/* *INDENT-ON* */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */