CRC
Cyclic Redundancy Check
-ctrlmbuf
- An *mbuf* carrying control data.
-
Data Plane
In contrast to the control plane, the data plane in a network architecture
are the layers involved when forwarding packets. These layers must be
that may be used by the DPDK application to store message buffers.
The message buffers are stored in a mempool, using the :ref:`Mempool Library <Mempool_Library>`.
-A rte_mbuf struct can carry network packet buffers
-or generic control buffers (indicated by the CTRL_MBUF_FLAG).
-This can be extended to other types.
+A rte_mbuf struct generally carries network packet buffers, but it can actually
+be any data (control data, events, ...).
The rte_mbuf header structure is kept as small as possible and currently uses
just two cache lines, with the most frequently used fields being on the first
of the two cache lines.
The Buffer Manager uses the :ref:`Mempool Library <Mempool_Library>` to allocate buffers.
Therefore, it ensures that the packet header is interleaved optimally across the channels and ranks for L3 processing.
An mbuf contains a field indicating the pool that it originated from.
-When calling rte_ctrlmbuf_free(m) or rte_pktmbuf_free(m), the mbuf returns to its original pool.
+When calling rte_pktmbuf_free(m), the mbuf returns to its original pool.
Constructors
------------
-Packet and control mbuf constructors are provided by the API.
-The rte_pktmbuf_init() and rte_ctrlmbuf_init() functions initialize some fields in the mbuf structure that
+Packet mbuf constructors are provided by the API.
+The rte_pktmbuf_init() function initializes some fields in the mbuf structure that
are not modified by the user once created (mbuf type, origin pool, buffer start address, and so on).
This function is given as a callback function to the rte_mempool_create() function at pool creation time.
that may be used by the DPDK application to store message buffers.
The message buffers are created at startup time and stored in a mempool, using the DPDK mempool library.
-This library provides an API to allocate/free mbufs, manipulate control message buffers (ctrlmbuf) which are generic message buffers,
-and packet buffers (pktmbuf) which are used to carry network packets.
+This library provides an API to allocate/free mbufs, manipulate
+packet buffers which are used to carry network packets.
Network Packet Buffer Management is described in :ref:`Mbuf Library <Mbuf_Library>`.
+-- librte_kni # Kernel NIC interface
+-- librte_kvargs # Argument parsing library
+-- librte_lpm # Longest prefix match library
- +-- librte_mbuf # Packet and control mbuf manipulation
+ +-- librte_mbuf # Packet buffer manipulation
+-- librte_mempool # Memory pool manager (fixed sized objects)
+-- librte_meter # QoS metering library
+-- librte_net # Various IP-related headers
EXPORT_MAP := rte_mbuf_version.map
-LIBABIVER := 3
+LIBABIVER := 4
# all source are stored in SRCS-y
SRCS-$(CONFIG_RTE_LIBRTE_MBUF) := rte_mbuf.c rte_mbuf_ptype.c
#include <rte_errno.h>
#include <rte_memcpy.h>
-/*
- * ctrlmbuf constructor, given as a callback function to
- * rte_mempool_obj_iter() or rte_mempool_create()
- */
-void
-rte_ctrlmbuf_init(struct rte_mempool *mp,
- __attribute__((unused)) void *opaque_arg,
- void *_m,
- __attribute__((unused)) unsigned i)
-{
- struct rte_mbuf *m = _m;
- rte_pktmbuf_init(mp, opaque_arg, _m, i);
- m->ol_flags |= CTRL_MBUF_FLAG;
-}
-
/*
* pktmbuf pool constructor, given as a callback function to
* rte_mempool_create(), or called directly if using
#define IND_ATTACHED_MBUF (1ULL << 62) /**< Indirect attached mbuf */
-/* Use final bit of flags to indicate a control mbuf */
-#define CTRL_MBUF_FLAG (1ULL << 63) /**< Mbuf contains control data */
-
/** Alignment constraint of mbuf private area. */
#define RTE_MBUF_PRIV_ALIGN 8
rte_mbuf_raw_free(m);
}
-/* Operations on ctrl mbuf */
-
-/**
- * The control mbuf constructor.
- *
- * This function initializes some fields in an mbuf structure that are
- * not modified by the user once created (mbuf type, origin pool, buffer
- * start address, and so on). This function is given as a callback function
- * to rte_mempool_obj_iter() or rte_mempool_create() at pool creation time.
- *
- * @param mp
- * The mempool from which the mbuf is allocated.
- * @param opaque_arg
- * A pointer that can be used by the user to retrieve useful information
- * for mbuf initialization. This pointer is the opaque argument passed to
- * rte_mempool_obj_iter() or rte_mempool_create().
- * @param m
- * The mbuf to initialize.
- * @param i
- * The index of the mbuf in the pool table.
- */
-void rte_ctrlmbuf_init(struct rte_mempool *mp, void *opaque_arg,
- void *m, unsigned i);
-
-/**
- * Allocate a new mbuf (type is ctrl) from mempool *mp*.
- *
- * This new mbuf is initialized with data pointing to the beginning of
- * buffer, and with a length of zero.
- *
- * @param mp
- * The mempool from which the mbuf is allocated.
- * @return
- * - The pointer to the new mbuf on success.
- * - NULL if allocation failed.
- */
-#define rte_ctrlmbuf_alloc(mp) rte_pktmbuf_alloc(mp)
-
-/**
- * Free a control mbuf back into its original mempool.
- *
- * @param m
- * The control mbuf to be freed.
- */
-#define rte_ctrlmbuf_free(m) rte_pktmbuf_free(m)
-
-/**
- * A macro that returns the pointer to the carried data.
- *
- * The value that can be read or assigned.
- *
- * @param m
- * The control mbuf.
- */
-#define rte_ctrlmbuf_data(m) ((char *)((m)->buf_addr) + (m)->data_off)
-
-/**
- * A macro that returns the length of the carried data.
- *
- * The value that can be read or assigned.
- *
- * @param m
- * The control mbuf.
- */
-#define rte_ctrlmbuf_len(m) rte_pktmbuf_data_len(m)
-
-/**
- * Tests if an mbuf is a control mbuf
- *
- * @param m
- * The mbuf to be tested
- * @return
- * - True (1) if the mbuf is a control mbuf
- * - False(0) otherwise
- */
-static inline int
-rte_is_ctrlmbuf(struct rte_mbuf *m)
-{
- return !!(m->ol_flags & CTRL_MBUF_FLAG);
-}
-
-/* Operations on pkt mbuf */
-
/**
* The packet mbuf constructor.
*
DPDK_2.0 {
global:
- rte_ctrlmbuf_init;
rte_get_rx_ol_flag_name;
rte_get_tx_ol_flag_name;
rte_mbuf_sanity_check;
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