text: /*
   * Copyright (c) 2015 Cisco 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 "ssvm_eth.h"
  
  vlib_node_registration_t ssvm_eth_input_node;
  
  typedef struct
  {
    u32 next_index;
    u32 sw_if_index;
  } ssvm_eth_input_trace_t;
  
  /* packet trace format function */
  static u8 *
  format_ssvm_eth_input_trace (u8 * s, va_list * args)
  {
    CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
    CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
    ssvm_eth_input_trace_t *t = va_arg (*args, ssvm_eth_input_trace_t *);
  
    s = format (s, "SSVM_ETH_INPUT: sw_if_index %d, next index %d",
  	      t->sw_if_index, t->next_index);
    return s;
  }
  
  vlib_node_registration_t ssvm_eth_input_node;
  
  #define foreach_ssvm_eth_input_error \
  _(NO_BUFFERS, "Rx packet drops (no buffers)")
  
  typedef enum
  {
  #define _(sym,str) SSVM_ETH_INPUT_ERROR_##sym,
    foreach_ssvm_eth_input_error
  #undef _
      SSVM_ETH_INPUT_N_ERROR,
  } ssvm_eth_input_error_t;
  
  static char *ssvm_eth_input_error_strings[] = {
  #define _(sym,string) string,
    foreach_ssvm_eth_input_error
  #undef _
  };
  
  typedef enum
  {
    SSVM_ETH_INPUT_NEXT_DROP,
    SSVM_ETH_INPUT_NEXT_ETHERNET_INPUT,
    SSVM_ETH_INPUT_NEXT_IP4_INPUT,
    SSVM_ETH_INPUT_NEXT_IP6_INPUT,
    SSVM_ETH_INPUT_NEXT_MPLS_INPUT,
    SSVM_ETH_INPUT_N_NEXT,
  } ssvm_eth_input_next_t;
  
  static inline uword
  ssvm_eth_device_input (ssvm_eth_main_t * em,
  		       ssvm_private_t * intfc, vlib_node_runtime_t * node)
  {
    ssvm_shared_header_t *sh = intfc->sh;
    vlib_main_t *vm = em->vlib_main;
    unix_shared_memory_queue_t *q;
    ssvm_eth_queue_elt_t *elt, *elts;
    u32 elt_index;
    u32 my_pid = intfc->my_pid;
    int rx_queue_index;
    u32 n_to_alloc = VLIB_FRAME_SIZE * 2;
    u32 n_allocated, n_present_in_cache;
    u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
    vlib_buffer_free_list_t *fl;
    u32 n_left_to_next, *to_next;
    u32 next0;
    u32 n_buffers;
    u32 n_available;
    u32 bi0, saved_bi0;
    vlib_buffer_t *b0, *prev;
    u32 saved_cache_size = 0;
    ethernet_header_t *eh0;
    u16 type0;
    u32 n_rx_bytes = 0, l3_offset0;
    u32 thread_index = vlib_get_thread_index ();
    u32 trace_cnt __attribute__ ((unused)) = vlib_get_trace_count (vm, node);
    volatile u32 *lock;
    u32 *elt_indices;
    uword n_trace = vlib_get_trace_count (vm, node);
  
    /* Either side down? buh-bye... */
    if (pointer_to_uword (sh->opaque[MASTER_ADMIN_STATE_INDEX]) == 0 ||
        pointer_to_uword (sh->opaque[SLAVE_ADMIN_STATE_INDEX]) == 0)
      return 0;
  
    if (intfc->i_am_master)
      q = (unix_shared_memory_queue_t *) (sh->opaque[TO_MASTER_Q_INDEX]);
    else
      q = (unix_shared_memory_queue_t *) (sh->opaque[TO_SLAVE_Q_INDEX]);
  
    /* Nothing to do? */
    if (q->cursize == 0)
      return 0;
  
    fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
  
    vec_reset_length (intfc->rx_queue);
  
    lock = (u32 *) q;
    while (__sync_lock_test_and_set (lock, 1))
      ;
    while (q->cursize > 0)
      {
        unix_shared_memory_queue_sub_raw (q, (u8 *) & elt_index);
        ASSERT (elt_index < 2048);
        vec_add1 (intfc->rx_queue, elt_index);
      }
    CLIB_MEMORY_BARRIER ();
    *lock = 0;
  
    n_present_in_cache = vec_len (em->buffer_cache);
  
    if (vec_len (em->buffer_cache) < vec_len (intfc->rx_queue) * 2)
      {
        vec_validate (em->buffer_cache,
  		    n_to_alloc + vec_len (em->buffer_cache) - 1);
        n_allocated =
  	vlib_buffer_alloc (vm, &em->buffer_cache[n_present_in_cache],
  			   n_to_alloc);
  
        n_present_in_cache += n_allocated;
        _vec_len (em->buffer_cache) = n_present_in_cache;
      }
  
    elts = (ssvm_eth_queue_elt_t *) (sh->opaque[CHUNK_POOL_INDEX]);
  
    n_buffers = vec_len (intfc->rx_queue);
    rx_queue_index = 0;
  
    while (n_buffers > 0)
      {
        vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
  
        while (n_buffers > 0 && n_left_to_next > 0)
  	{
  	  elt = elts + intfc->rx_queue[rx_queue_index];
  
  	  saved_cache_size = n_present_in_cache;
  	  if (PREDICT_FALSE (saved_cache_size == 0))
  	    {
  	      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
  	      goto out;
  	    }
  	  saved_bi0 = bi0 = em->buffer_cache[--n_present_in_cache];
  	  b0 = vlib_get_buffer (vm, bi0);
  	  prev = 0;
  
  	  while (1)
  	    {
  	      vlib_buffer_init_for_free_list (b0, fl);
  
  	      b0->current_data = elt->current_data_hint;
  	      b0->current_length = elt->length_this_buffer;
  	      b0->total_length_not_including_first_buffer =
  		elt->total_length_not_including_first_buffer;
  
  	      clib_memcpy (b0->data + b0->current_data, elt->data,
  			   b0->current_length);
  
  	      if (PREDICT_FALSE (prev != 0))
  		prev->next_buffer = bi0;
  
  	      if (PREDICT_FALSE (elt->flags & SSVM_BUFFER_NEXT_PRESENT))
  		{
  		  prev = b0;
  		  if (PREDICT_FALSE (n_present_in_cache == 0))
  		    {
  		      vlib_put_next_frame (vm, node, next_index,
  					   n_left_to_next);
  		      goto out;
  		    }
  		  bi0 = em->buffer_cache[--n_present_in_cache];
  		  b0 = vlib_get_buffer (vm, bi0);
  		}
  	      else
  		break;
  	    }
  
  	  saved_cache_size = n_present_in_cache;
  
  	  to_next[0] = saved_bi0;
  	  to_next++;
  	  n_left_to_next--;
  
  	  b0 = vlib_get_buffer (vm, saved_bi0);
  	  eh0 = vlib_buffer_get_current (b0);
  
  	  type0 = clib_net_to_host_u16 (eh0->type);
  
  	  next0 = SSVM_ETH_INPUT_NEXT_ETHERNET_INPUT;
  
  	  if (type0 == ETHERNET_TYPE_IP4)
  	    next0 = SSVM_ETH_INPUT_NEXT_IP4_INPUT;
  	  else if (type0 == ETHERNET_TYPE_IP6)
  	    next0 = SSVM_ETH_INPUT_NEXT_IP6_INPUT;
  	  else if (type0 == ETHERNET_TYPE_MPLS)
  	    next0 = SSVM_ETH_INPUT_NEXT_MPLS_INPUT;
  
  	  l3_offset0 = ((next0 == SSVM_ETH_INPUT_NEXT_IP4_INPUT ||
  			 next0 == SSVM_ETH_INPUT_NEXT_IP6_INPUT ||
  			 next0 == SSVM_ETH_INPUT_NEXT_MPLS_INPUT) ?
  			sizeof (ethernet_header_t) : 0);
  
  	  n_rx_bytes += b0->current_length
  	    + b0->total_length_not_including_first_buffer;
  
  	  b0->current_data += l3_offset0;
  	  b0->current_length -= l3_offset0;
  	  b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
  
  	  vnet_buffer (b0)->sw_if_index[VLIB_RX] = intfc->vlib_hw_if_index;
  	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
  
  	  /*
  	   * Turn this on if you run into
  	   * "bad monkey" contexts, and you want to know exactly
  	   * which nodes they've visited... See main.c...
  	   */
  	  VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
  
  	  if (PREDICT_FALSE (n_trace > 0))
  	    {
  	      ssvm_eth_input_trace_t *tr;
  
  	      vlib_trace_buffer (vm, node, next0, b0, /* follow_chain */ 1);
  	      vlib_set_trace_count (vm, node, --n_trace);
  
  	      tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
  
  	      tr->next_index = next0;
  	      tr->sw_if_index = intfc->vlib_hw_if_index;
  	    }
  
  	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
  					   to_next, n_left_to_next,
  					   bi0, next0);
  	  n_buffers--;
  	  rx_queue_index++;
  	}
  
        vlib_put_next_frame (vm, node, next_index, n_left_to_next);
      }
  
  out:
    if (em->buffer_cache)
      _vec_len (em->buffer_cache) = saved_cache_size;
    else
      ASSERT (saved_cache_size == 0);
  
    ssvm_lock (sh, my_pid, 2);
  
    ASSERT (vec_len (intfc->rx_queue) > 0);
  
    n_available = (u32) pointer_to_uword (sh->opaque[CHUNK_POOL_NFREE]);
    elt_indices = (u32 *) (sh->opaque[CHUNK_POOL_FREELIST_INDEX]);
  
    clib_memcpy (&elt_indices[n_available], intfc->rx_queue,
  	       vec_len (intfc->rx_queue) * sizeof (u32));
  
    n_available += vec_len (intfc->rx_queue);
    sh->opaque[CHUNK_POOL_NFREE] = uword_to_pointer (n_available, void *);
  
    ssvm_unlock (sh);
  
    vlib_error_count (vm, node->node_index, SSVM_ETH_INPUT_ERROR_NO_BUFFERS,
  		    n_buffers);
  
    vlib_increment_combined_counter
      (vnet_get_main ()->interface_main.combined_sw_if_counters
       + VNET_INTERFACE_COUNTER_RX, thread_index,
       intfc->vlib_hw_if_index, rx_queue_index, n_rx_bytes);
  
    vnet_device_increment_rx_packets (thread_index, rx_queue_index);
  
    return rx_queue_index;
  }
  
  static uword
  ssvm_eth_input_node_fn (vlib_main_t * vm,
  			vlib_node_runtime_t * node, vlib_frame_t * frame)
  {
    ssvm_eth_main_t *em = &ssvm_eth_main;
    ssvm_private_t *intfc;
    uword n_rx_packets = 0;
  
    vec_foreach (intfc, em->intfcs)
    {
      n_rx_packets += ssvm_eth_device_input (em, intfc, node);
    }
  
    return n_rx_packets;
  }
  
  /* *INDENT-OFF* */
  VLIB_REGISTER_NODE (ssvm_eth_input_node) = {
    .function = ssvm_eth_input_node_fn,
    .name = "ssvm_eth_input",
    .vector_size = sizeof (u32),
    .format_trace = format_ssvm_eth_input_trace,
    .type = VLIB_NODE_TYPE_INPUT,
    .state = VLIB_NODE_STATE_DISABLED,
  
    .n_errors = ARRAY_LEN(ssvm_eth_input_error_strings),
    .error_strings = ssvm_eth_input_error_strings,
  
    .n_next_nodes = SSVM_ETH_INPUT_N_NEXT,
  
    /* edit / add dispositions here */
    .next_nodes = {
          [SSVM_ETH_INPUT_NEXT_DROP] = "error-drop",
          [SSVM_ETH_INPUT_NEXT_ETHERNET_INPUT] = "ethernet-input",
          [SSVM_ETH_INPUT_NEXT_IP4_INPUT] = "ip4-input",
          [SSVM_ETH_INPUT_NEXT_IP6_INPUT] = "ip6-input",
          [SSVM_ETH_INPUT_NEXT_MPLS_INPUT] = "mpls-input",
    },
  };
  
  VLIB_NODE_FUNCTION_MULTIARCH (ssvm_eth_input_node, ssvm_eth_input_node_fn)
  /* *INDENT-ON* */
  
  
  /*
   * fd.io coding-style-patch-verification: ON
   *
   * Local Variables:
   * eval: (c-set-style "gnu")
   * End:
   */
  