vnet/vnet/devices/ssvm/node.c

   1 /*
   2  * Copyright (c) 2015 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 #include "ssvm_eth.h"
  16
  17 vlib_node_registration_t ssvm_eth_input_node;
  18
  19 typedef struct {
  20   u32 next_index;
  21   u32 sw_if_index;
  22 } ssvm_eth_input_trace_t;
  23
  24 /* packet trace format function */
  25 static u8 * format_ssvm_eth_input_trace (u8 * s, va_list * args)
  26 {
  27   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  28   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  29   ssvm_eth_input_trace_t * t = va_arg (*args, ssvm_eth_input_trace_t *);
  30
  31   s = format (s, "SSVM_ETH_INPUT: sw_if_index %d, next index %d",
  32               t->sw_if_index, t->next_index);
  33   return s;
  34 }
  35
  36 vlib_node_registration_t ssvm_eth_input_node;
  37
  38 #define foreach_ssvm_eth_input_error \
  39 _(NO_BUFFERS, "Rx packet drops (no buffers)")
  40
  41 typedef enum {
  42 #define _(sym,str) SSVM_ETH_INPUT_ERROR_##sym,
  43   foreach_ssvm_eth_input_error
  44 #undef _
  45   SSVM_ETH_INPUT_N_ERROR,
  46 } ssvm_eth_input_error_t;
  47
  48 static char * ssvm_eth_input_error_strings[] = {
  49 #define _(sym,string) string,
  50   foreach_ssvm_eth_input_error
  51 #undef _
  52 };
  53
  54 typedef enum {
  55   SSVM_ETH_INPUT_NEXT_DROP,
  56   SSVM_ETH_INPUT_NEXT_ETHERNET_INPUT,
  57   SSVM_ETH_INPUT_NEXT_IP4_INPUT,
  58   SSVM_ETH_INPUT_NEXT_IP6_INPUT,
  59   SSVM_ETH_INPUT_NEXT_MPLS_INPUT,
  60   SSVM_ETH_INPUT_N_NEXT,
  61 } ssvm_eth_input_next_t;
  62
  63 static inline uword
  64 ssvm_eth_device_input (ssvm_eth_main_t * em,
  65                        ssvm_private_t * intfc,
  66                        vlib_node_runtime_t * node)
  67 {
  68   ssvm_shared_header_t * sh = intfc->sh;
  69   vlib_main_t * vm = em->vlib_main;
  70   unix_shared_memory_queue_t * q;
  71   ssvm_eth_queue_elt_t * elt, * elts;
  72   u32 elt_index;
  73   u32 my_pid = intfc->my_pid;
  74   int rx_queue_index;
  75   u32 n_to_alloc = VLIB_FRAME_SIZE * 2;
  76   u32 n_allocated, n_present_in_cache;
  77 #if DPDK > 0
  78   u32 next_index = DPDK_RX_NEXT_ETHERNET_INPUT;
  79 #else
  80   u32 next_index = 0;
  81 #endif
  82   vlib_buffer_free_list_t * fl;
  83   u32 n_left_to_next, * to_next;
  84   u32 next0;
  85   u32 n_buffers;
  86   u32 n_available;
  87   u32 bi0, saved_bi0;
  88   vlib_buffer_t * b0, * prev;
  89   u32 saved_cache_size = 0;
  90   ethernet_header_t * eh0;
  91   u16 type0;
  92   u32 n_rx_bytes = 0, l3_offset0;
  93   u32 cpu_index = os_get_cpu_number();
  94   u32 trace_cnt __attribute__((unused)) = vlib_get_trace_count (vm, node);
  95   volatile u32 * lock;
  96   u32 * elt_indices;
  97
  98   /* Either side down? buh-bye... */
  99   if ((u64)(sh->opaque [MASTER_ADMIN_STATE_INDEX]) == 0 ||
 100       (u64)(sh->opaque [SLAVE_ADMIN_STATE_INDEX]) == 0)
 101     return 0;
 102
 103   if (intfc->i_am_master)
 104     q = (unix_shared_memory_queue_t *)(sh->opaque [TO_MASTER_Q_INDEX]);
 105   else
 106     q = (unix_shared_memory_queue_t *)(sh->opaque [TO_SLAVE_Q_INDEX]);
 107
 108   /* Nothing to do? */
 109   if (q->cursize == 0)
 110     return 0;
 111
 112   fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
 113
 114   vec_reset_length (intfc->rx_queue);
 115
 116   lock = (u32 *) q;
 117   while (__sync_lock_test_and_set (lock, 1))
 118     ;
 119   while (q->cursize > 0)
 120     {
 121       unix_shared_memory_queue_sub_raw (q, (u8 *)&elt_index);
 122       ASSERT(elt_index < 2048);
 123       vec_add1 (intfc->rx_queue, elt_index);
 124     }
 125   CLIB_MEMORY_BARRIER();
 126   *lock = 0;
 127
 128   n_present_in_cache = vec_len (em->buffer_cache);
 129
 130   if (vec_len (em->buffer_cache) < vec_len (intfc->rx_queue) * 2)
 131     {
 132       vec_validate (em->buffer_cache,
 133                     n_to_alloc + vec_len (em->buffer_cache) - 1);
 134       n_allocated =
 135         vlib_buffer_alloc (vm, &em->buffer_cache [n_present_in_cache],
 136                            n_to_alloc);
 137
 138       n_present_in_cache += n_allocated;
 139       _vec_len (em->buffer_cache) = n_present_in_cache;
 140     }
 141
 142   elts = (ssvm_eth_queue_elt_t *) (sh->opaque [CHUNK_POOL_INDEX]);
 143
 144   n_buffers = vec_len (intfc->rx_queue);
 145   rx_queue_index = 0;
 146
 147   while (n_buffers > 0)
 148     {
 149       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 150
 151       while (n_buffers > 0 && n_left_to_next > 0)
 152         {
 153           elt = elts + intfc->rx_queue[rx_queue_index];
 154
 155           saved_cache_size = n_present_in_cache;
 156           if (PREDICT_FALSE(saved_cache_size == 0))
 157             {
 158               vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 159               goto out;
 160             }
 161           saved_bi0 = bi0 = em->buffer_cache [--n_present_in_cache];
 162           b0 = vlib_get_buffer (vm, bi0);
 163           prev = 0;
 164
 165           while (1)
 166             {
 167               vlib_buffer_init_for_free_list (b0, fl);
 168               b0->clone_count = 0;
 169
 170               b0->current_data = elt->current_data_hint;
 171               b0->current_length = elt->length_this_buffer;
 172               b0->total_length_not_including_first_buffer =
 173                 elt->total_length_not_including_first_buffer;
 174
 175               memcpy (b0->data + b0->current_data, elt->data,
 176                       b0->current_length);
 177
 178               if (PREDICT_FALSE(prev != 0))
 179                   prev->next_buffer = bi0;
 180
 181               if (PREDICT_FALSE(elt->flags & SSVM_BUFFER_NEXT_PRESENT))
 182                 {
 183                   prev = b0;
 184                   if (PREDICT_FALSE(n_present_in_cache == 0))
 185                     {
 186                       vlib_put_next_frame (vm, node, next_index,
 187                                            n_left_to_next);
 188                       goto out;
 189                     }
 190                   bi0 = em->buffer_cache [--n_present_in_cache];
 191                   b0 = vlib_get_buffer (vm, bi0);
 192                 }
 193               else
 194                 break;
 195             }
 196
 197           saved_cache_size = n_present_in_cache;
 198
 199           to_next[0] = saved_bi0;
 200           to_next++;
 201           n_left_to_next--;
 202
 203           b0 = vlib_get_buffer (vm, saved_bi0);
 204           eh0 = vlib_buffer_get_current (b0);
 205
 206           type0 = clib_net_to_host_u16 (eh0->type);
 207
 208           next0 = SSVM_ETH_INPUT_NEXT_ETHERNET_INPUT;
 209
 210           if (type0 == ETHERNET_TYPE_IP4)
 211             next0 = SSVM_ETH_INPUT_NEXT_IP4_INPUT;
 212           else if (type0 == ETHERNET_TYPE_IP6)
 213             next0 = SSVM_ETH_INPUT_NEXT_IP6_INPUT;
 214           else if (type0 == ETHERNET_TYPE_MPLS_UNICAST)
 215             next0 = SSVM_ETH_INPUT_NEXT_MPLS_INPUT;
 216
 217           l3_offset0 = ((next0 == SSVM_ETH_INPUT_NEXT_IP4_INPUT ||
 218                          next0 == SSVM_ETH_INPUT_NEXT_IP6_INPUT ||
 219                          next0 == SSVM_ETH_INPUT_NEXT_MPLS_INPUT) ?
 220                         sizeof (ethernet_header_t) : 0);
 221
 222           n_rx_bytes += b0->current_length
 223             + b0->total_length_not_including_first_buffer;
 224
 225           b0->current_data += l3_offset0;
 226           b0->current_length -= l3_offset0;
 227           b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
 228
 229           vnet_buffer(b0)->sw_if_index[VLIB_RX] = intfc->vlib_hw_if_index;
 230           vnet_buffer(b0)->sw_if_index[VLIB_TX] = (u32)~0;
 231
 232           /*
 233            * Turn this on if you run into
 234            * "bad monkey" contexts, and you want to know exactly
 235            * which nodes they've visited... See main.c...
 236            */
 237           VLIB_BUFFER_TRACE_TRAJECTORY_INIT(b0);
 238
 239           /* $$$$ tracing */
 240
 241           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 242                                            to_next, n_left_to_next,
 243                                            bi0, next0);
 244           n_buffers--;
 245           rx_queue_index++;
 246         }
 247
 248       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 249     }
 250
 251  out:
 252   if (em->buffer_cache)
 253     _vec_len (em->buffer_cache) = saved_cache_size;
 254   else
 255     ASSERT (saved_cache_size == 0);
 256
 257   ssvm_lock (sh, my_pid, 2);
 258
 259   ASSERT(vec_len(intfc->rx_queue) > 0);
 260
 261   n_available = (u32)(u64)(sh->opaque[CHUNK_POOL_NFREE]);
 262   elt_indices = (u32 *)(sh->opaque[CHUNK_POOL_FREELIST_INDEX]);
 263
 264   memcpy (&elt_indices[n_available], intfc->rx_queue,
 265           vec_len (intfc->rx_queue) * sizeof (u32));
 266
 267   n_available += vec_len (intfc->rx_queue);
 268   sh->opaque[CHUNK_POOL_NFREE] = (void *) (u64) n_available;
 269
 270   ssvm_unlock (sh);
 271
 272   vlib_error_count (vm, node->node_index, SSVM_ETH_INPUT_ERROR_NO_BUFFERS,
 273                     n_buffers);
 274
 275   vlib_increment_combined_counter
 276     (vnet_get_main()->interface_main.combined_sw_if_counters
 277      + VNET_INTERFACE_COUNTER_RX, cpu_index,
 278      intfc->vlib_hw_if_index,
 279      rx_queue_index, n_rx_bytes);
 280
 281   return rx_queue_index;
 282 }
 283
 284 static uword
 285 ssvm_eth_input_node_fn (vlib_main_t * vm,
 286                   vlib_node_runtime_t * node,
 287                   vlib_frame_t * frame)
 288 {
 289   ssvm_eth_main_t * em = &ssvm_eth_main;
 290   ssvm_private_t * intfc;
 291   uword n_rx_packets = 0;
 292
 293   vec_foreach (intfc, em->intfcs)
 294     {
 295       n_rx_packets += ssvm_eth_device_input (em, intfc, node);
 296     }
 297
 298   return n_rx_packets;
 299 }
 300
 301 VLIB_REGISTER_NODE (ssvm_eth_input_node) = {
 302   .function = ssvm_eth_input_node_fn,
 303   .name = "ssvm_eth_input",
 304   .vector_size = sizeof (u32),
 305   .format_trace = format_ssvm_eth_input_trace,
 306   .type = VLIB_NODE_TYPE_INPUT,
 307   .state = VLIB_NODE_STATE_DISABLED,
 308
 309   .n_errors = ARRAY_LEN(ssvm_eth_input_error_strings),
 310   .error_strings = ssvm_eth_input_error_strings,
 311
 312   .n_next_nodes = SSVM_ETH_INPUT_N_NEXT,
 313
 314   /* edit / add dispositions here */
 315   .next_nodes = {
 316         [SSVM_ETH_INPUT_NEXT_DROP] = "error-drop",
 317         [SSVM_ETH_INPUT_NEXT_ETHERNET_INPUT] = "ethernet-input",
 318         [SSVM_ETH_INPUT_NEXT_IP4_INPUT] = "ip4-input",
 319         [SSVM_ETH_INPUT_NEXT_IP6_INPUT] = "ip6-input",
 320         [SSVM_ETH_INPUT_NEXT_MPLS_INPUT] = "mpls-gre-input",
 321   },
 322 };
 323