+ if (PREDICT_FALSE
+ (sw_if_index[0] != vnet_buffer (b[0])->sw_if_index[VLIB_TX]))
+ {
+ const vnet_hw_interface_t *hi;
+ sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
+ hi = vnet_get_sup_hw_interface (gm->vnet_main, sw_if_index[0]);
+ gt[0] = &gm->tunnels[hi->dev_instance];
+ adj_index[0] = gt[0]->l2_adj_index;
+ }
+ if (PREDICT_FALSE
+ (sw_if_index[1] != vnet_buffer (b[1])->sw_if_index[VLIB_TX]))
+ {
+ const vnet_hw_interface_t *hi;
+ sw_if_index[1] = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
+ hi = vnet_get_sup_hw_interface (gm->vnet_main, sw_if_index[1]);
+ gt[1] = &gm->tunnels[hi->dev_instance];
+ adj_index[1] = gt[1]->l2_adj_index;
+ }
+
+ vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = adj_index[0];
+ vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = adj_index[1];
+
+ if (PREDICT_FALSE (gt[0]->type == GRE_TUNNEL_TYPE_ERSPAN))
+ {
+ /* Encap GRE seq# and ERSPAN type II header */
+ erspan_t2_t *h0;
+ u32 seq_num;
+ u64 hdr;
+ vlib_buffer_advance (b[0], -sizeof (erspan_t2_t));
+ h0 = vlib_buffer_get_current (b[0]);
+ seq_num = clib_atomic_fetch_add (>[0]->gre_sn->seq_num, 1);
+ hdr = clib_host_to_net_u64 (ERSPAN_HDR2);
+ h0->seq_num = clib_host_to_net_u32 (seq_num);
+ h0->t2_u64 = hdr;
+ h0->t2.cos_en_t_session |= clib_host_to_net_u16 (gt[0]->session_id);
+ }
+ if (PREDICT_FALSE (gt[1]->type == GRE_TUNNEL_TYPE_ERSPAN))
+ {
+ /* Encap GRE seq# and ERSPAN type II header */
+ erspan_t2_t *h0;
+ u32 seq_num;
+ u64 hdr;
+ vlib_buffer_advance (b[1], -sizeof (erspan_t2_t));
+ h0 = vlib_buffer_get_current (b[1]);
+ seq_num = clib_atomic_fetch_add (>[1]->gre_sn->seq_num, 1);
+ hdr = clib_host_to_net_u64 (ERSPAN_HDR2);
+ h0->seq_num = clib_host_to_net_u32 (seq_num);
+ h0->t2_u64 = hdr;
+ h0->t2.cos_en_t_session |= clib_host_to_net_u16 (gt[1]->session_id);
+ }
+
+ if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ gre_tx_trace_t *tr = vlib_add_trace (vm, node,
+ b[0], sizeof (*tr));
+ tr->tunnel_id = gt[0] - gm->tunnels;
+ tr->src = gt[0]->tunnel_src;
+ tr->dst = gt[0]->tunnel_dst.fp_addr;
+ tr->length = vlib_buffer_length_in_chain (vm, b[0]);
+ }
+ if (PREDICT_FALSE (b[1]->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ gre_tx_trace_t *tr = vlib_add_trace (vm, node,
+ b[1], sizeof (*tr));
+ tr->tunnel_id = gt[1] - gm->tunnels;
+ tr->src = gt[1]->tunnel_src;
+ tr->dst = gt[1]->tunnel_dst.fp_addr;
+ tr->length = vlib_buffer_length_in_chain (vm, b[1]);
+ }
+
+ b += 2;
+ n_left_from -= 2;
+ }
+
+ while (n_left_from >= 1)