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authorwanghanlin <wanghanlin@corp.netease.com>2019-12-16 19:14:39 +0800
committerFlorin Coras <florin.coras@gmail.com>2019-12-17 07:49:40 +0000
commit96453fd2417ebd1d69354a7fb692976129cea80e (patch)
treeec417e7692833025f1a5335b43f5d187d1cf6fc6 /src/vnet/snap
parentecb9d18c59f65c87430d6a7c53ee1e525d75d430 (diff)
vcl: RX event may lost when accept session repeatedly
Type: fix Some applications may call accept repeatedly to process all connect request until get EAGIAIN error. Subsequent call may get RX event of previous accepted session, then should process it rather than just discard it. Signed-off-by: wanghanlin <wanghanlin@corp.netease.com> Change-Id: Ice53442de66289a62591b79a9cc31e883e894c23
Diffstat (limited to 'src/vnet/snap')
0 files changed, 0 insertions, 0 deletions
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/*
 *------------------------------------------------------------------
 * ip_path_mtu.h
 *
 * Copyright (c) 2021 Graphiant.
 * 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/ip/ip.h>

/**
 * @brief
 * The Path MTU DPO. interposed in the forwarding chain of the host prefix.
 */
typedef struct ip_pmtu_dpo_t_
{
  /**
   * The protocol of packets using this DPO
   */
  dpo_proto_t ipm_proto;

  u8 __pad8;

  /**
   * Configured Path Mtu
   */
  u16 ipm_pmtu;

  /**
   * number of locks.
   */
  u16 ipm_locks;

  /**
   * Stacked DPO
   */
  dpo_id_t ipm_dpo;
} ip_pmtu_dpo_t;

/*
 * PMTU DPOs are accessed in the data-path so they should not straddle a cache
 * line. Align to a integer factor of a cacheline
 */
STATIC_ASSERT_SIZEOF (ip_pmtu_dpo_t, 2 * sizeof (u64));

#define foreach_ip_pmtu_flag                                                  \
  _ (ATTACHED, 0, "attached")                                                 \
  _ (REMOTE, 1, "remote")                                                     \
  _ (STALE, 2, "stale")

typedef enum ip_pmtu_flags_t_
{
#define _(a, b, c) IP_PMTU_FLAG_##a = (1 << b),
  foreach_ip_pmtu_flag
#undef _
} ip_pmtu_flags_t;

/**
 * Remote Path MTU tracking object
 */
typedef struct ip_pmtu_t_
{
  /** linkage into the FIB graph */
  fib_node_t ipt_node;

  /** Track fib entry */
  fib_node_index_t ipt_fib_entry;
  u32 ipt_sibling;
  ip_pmtu_flags_t ipt_flags;

  /** Configured MTU */
  u16 ipt_cfg_pmtu;

  /** MTU from the parent MTU */
  u16 ipt_parent_pmtu;

  /** operational MTU; the minimum value of the cfg and parent MTU */
  u16 ipt_oper_pmtu;
} ip_pmtu_t;

extern int ip_path_mtu_update (const ip_address_t *nh, u32 table_id, u16 pmtu);

typedef walk_rc_t (*ip_path_mtu_walk_t) (index_t ipti, void *ctx);

extern void ip_path_mtu_walk (ip_path_mtu_walk_t fn, void *ctx);
extern int ip_path_mtu_replace_begin (void);
extern int ip_path_mtu_replace_end (void);

extern u32 ip_pmtu_get_table_id (const ip_pmtu_t *ipt);
extern void ip_pmtu_get_ip (const ip_pmtu_t *ipt, ip_address_t *ip);

extern void ip_pmtu_dpo_add_or_lock (u16 pmtu, const dpo_id_t *parent,
				     dpo_id_t *dpo);

/**
 * Data-plane accessor functions
 */
extern ip_pmtu_dpo_t *ip_pmtu_dpo_pool;
static_always_inline ip_pmtu_dpo_t *
ip_pmtu_dpo_get (index_t index)
{
  return (pool_elt_at_index (ip_pmtu_dpo_pool, index));
}

extern ip_pmtu_t *ip_pmtu_pool;
static_always_inline ip_pmtu_t *
ip_path_mtu_get (index_t index)
{
  return (pool_elt_at_index (ip_pmtu_pool, index));
}

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