--------
The application demonstrates the use of zero-copy buffers for packet forwarding.
-The initialization and run-time paths are very similar to those of the L2 forwarding application
-(see Chapter 9 "L2 Forwarding Sample Application (in Real and Virtualized Environments)" for details more information).
+The initialization and run-time paths are very similar to those of the :doc:`l2_forward_real_virtual`.
This guide highlights the differences between the two applications.
There are two key differences from the L2 Forwarding sample application:
.. code-block:: console
- ./build/ipv4_multicast -c 0x00f -n 3 -- -p 0x3 -q 1
+ ./build/ipv4_multicast -l 0-3 -n 3 -- -p 0x3 -q 1
In this command:
The following sections provide some explanation of the code.
As mentioned in the overview section,
-the initialization and run-time paths are very similar to those of the L2 Forwarding sample application
-(see Chapter 9 "L2 Forwarding Sample Application in Real and Virtualized Environments" for more information).
+the initialization and run-time paths are very similar to those of the :doc:`l2_forward_real_virtual`.
The following sections describe aspects that are specific to the IPv4 Multicast sample application.
Memory Pool Initialization
.. code-block:: c
- packet_pool = rte_mempool_create("packet_pool", NB_PKT_MBUF, PKT_MBUF_SIZE, 32, sizeof(struct rte_pktmbuf_pool_private),
- rte_pktmbuf_pool_init, NULL, rte_pktmbuf_init, NULL, rte_socket_id(), 0);
-
- header_pool = rte_mempool_create("header_pool", NB_HDR_MBUF, HDR_MBUF_SIZE, 32, 0, NULL, NULL, rte_pktmbuf_init, NULL, rte_socket_id(), 0);
- clone_pool = rte_mempool_create("clone_pool", NB_CLONE_MBUF,
- CLONE_MBUF_SIZE, 32, 0, NULL, NULL, rte_pktmbuf_init, NULL, rte_socket_id(), 0);
+ packet_pool = rte_pktmbuf_pool_create("packet_pool", NB_PKT_MBUF, 32,
+ 0, PKT_MBUF_DATA_SIZE, rte_socket_id());
+ header_pool = rte_pktmbuf_pool_create("header_pool", NB_HDR_MBUF, 32,
+ 0, HDR_MBUF_DATA_SIZE, rte_socket_id());
+ clone_pool = rte_pktmbuf_pool_create("clone_pool", NB_CLONE_MBUF, 32,
+ 0, 0, rte_socket_id());
The reason for this is because indirect buffers are not supposed to hold any packet data and
therefore can be initialized with lower amount of reserved memory for each buffer.
/* Remove the Ethernet header from the input packet */
iphdr = (struct ipv4_hdr *)rte_pktmbuf_adj(m, sizeof(struct ether_hdr));
- RTE_MBUF_ASSERT(iphdr != NULL);
+ RTE_ASSERT(iphdr != NULL);
dest_addr = rte_be_to_cpu_32(iphdr->dst_addr);
Then, the packet is checked to see if it has a multicast destination address and
ethdr = (struct ether_hdr *)rte_pktmbuf_prepend(pkt, (uint16_t) sizeof(*ethdr));
- RTE_MBUF_ASSERT(ethdr != NULL);
+ RTE_ASSERT(ethdr != NULL);
ether_addr_copy(dest_addr, ðdr->d_addr);
ether_addr_copy(&ports_eth_addr[port], ðdr->s_addr);