vnet/vnet/dpdk_replication.h

   1 #ifndef __included_dpdk_replication_h__
   2 #define __included_dpdk_replication_h__
   3 #include <vnet/devices/dpdk/dpdk.h>
   4
   5 /*
   6  * vlib_dpdk_clone_buffer - clone a buffer
   7  * for port mirroring, lawful intercept, etc.
   8  * rte_pktmbuf_clone (...) requires that the forwarding path
   9  * not touch any of the cloned data. The hope is that we'll
  10  * figure out how to relax that restriction.
  11  *
  12  * For the moment, copy packet data.
  13  */
  14
  15 static inline vlib_buffer_t *
  16 vlib_dpdk_clone_buffer (vlib_main_t * vm, vlib_buffer_t * b)
  17 {
  18   u32 new_buffers_needed = 1;
  19   unsigned socket_id = rte_socket_id();
  20   struct rte_mempool *rmp = vm->buffer_main->pktmbuf_pools[socket_id];
  21   struct rte_mbuf *rte_mbufs[5];
  22   vlib_buffer_free_list_t * fl;
  23   vlib_buffer_t * rv;
  24   u8 * copy_src, * copy_dst;
  25   vlib_buffer_t *src_buf, *dst_buf;
  26
  27   fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
  28
  29   if (PREDICT_FALSE(b->flags & VLIB_BUFFER_NEXT_PRESENT))
  30     {
  31       vlib_buffer_t *tmp = b;
  32       int i;
  33
  34       while (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
  35         {
  36           new_buffers_needed ++;
  37           tmp = vlib_get_buffer (vm, tmp->next_buffer);
  38         }
  39
  40       /* Should never happen... */
  41       if (PREDICT_FALSE(new_buffers_needed > ARRAY_LEN(rte_mbufs)))
  42         {
  43           clib_warning ("need %d buffers", new_buffers_needed);
  44           return 0;
  45         }
  46
  47       if (rte_mempool_get_bulk (rmp, (void **)rte_mbufs,
  48                                 new_buffers_needed) < 0)
  49         return 0;
  50
  51       src_buf = b;
  52       rv = dst_buf = (vlib_buffer_t *)(rte_mbufs[0] + 1);
  53       vlib_buffer_init_for_free_list (dst_buf, fl);
  54       copy_src = b->data + src_buf->current_data;
  55       copy_dst = dst_buf->data + src_buf->current_data;
  56
  57       for (i = 0; i < new_buffers_needed; i++)
  58         {
  59           memcpy (copy_src, copy_dst, src_buf->current_length);
  60           dst_buf->current_data = src_buf->current_data;
  61           dst_buf->current_length = src_buf->current_length;
  62           dst_buf->flags = src_buf->flags;
  63
  64           if (i == 0)
  65             {
  66               dst_buf->total_length_not_including_first_buffer =
  67                 src_buf->total_length_not_including_first_buffer;
  68               vnet_buffer(dst_buf)->sw_if_index[VLIB_RX] =
  69                 vnet_buffer(src_buf)->sw_if_index[VLIB_RX];
  70               vnet_buffer(dst_buf)->sw_if_index[VLIB_TX] =
  71                 vnet_buffer(src_buf)->sw_if_index[VLIB_TX];
  72               vnet_buffer(dst_buf)->l2 = vnet_buffer(b)->l2;
  73             }
  74
  75           if (i < new_buffers_needed - 1)
  76             {
  77               src_buf = vlib_get_buffer (vm, src_buf->next_buffer);
  78               dst_buf = (vlib_buffer_t *)(rte_mbufs[i+1] + 1);
  79               vlib_buffer_init_for_free_list (dst_buf, fl);
  80               copy_src = src_buf->data;
  81               copy_dst = dst_buf->data;
  82             }
  83         }
  84       return rv;
  85     }
  86
  87   if (rte_mempool_get_bulk (rmp, (void **)rte_mbufs, 1) < 0)
  88     return 0;
  89
  90   rv = (vlib_buffer_t *)(rte_mbufs[0] + 1);
  91   vlib_buffer_init_for_free_list (rv, fl);
  92
  93   memcpy(rv->data + b->current_data, b->data + b->current_data,
  94          b->current_length);
  95   rv->current_data = b->current_data;
  96   rv->current_length = b->current_length;
  97   vnet_buffer(rv)->sw_if_index[VLIB_RX] =
  98     vnet_buffer(b)->sw_if_index[VLIB_RX];
  99   vnet_buffer(rv)->sw_if_index[VLIB_TX] =
 100     vnet_buffer(b)->sw_if_index[VLIB_TX];
 101   vnet_buffer(rv)->l2 = vnet_buffer(b)->l2;
 102
 103   return (rv);
 104 }
 105
 106
 107 #endif /* __included_dpdk_replication_h__ */