This port presents the IPv4 fragmentation operation as a Packet Framework port.
Code duplication with examples/ipv4_frag sample app to be resolved soon by
linking the relevant library once upstreamed.
Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu at intel.com>
---
lib/librte_port/rte_ipv4_frag.h | 254 +++++++++++++++++++++++++++++++++++++++
lib/librte_port/rte_port_frag.c | 230 +++++++++++++++++++++++++++++++++++
lib/librte_port/rte_port_frag.h | 94 ++++++++++++++
3 files changed, 578 insertions(+), 0 deletions(-)
create mode 100644 lib/librte_port/rte_ipv4_frag.h
create mode 100644 lib/librte_port/rte_port_frag.c
create mode 100644 lib/librte_port/rte_port_frag.h
diff --git a/lib/librte_port/rte_ipv4_frag.h b/lib/librte_port/rte_ipv4_frag.h
new file mode 100644
index 0000000..b1e9eac
--- /dev/null
+++ b/lib/librte_port/rte_ipv4_frag.h
@@ -0,0 +1,254 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __INCLUDE_RTE_IPV4_FRAG_H__
+#define __INCLUDE_RTE_IPV4_FRAG_H__
+#include <rte_ip.h>
+#include <rte_memcpy.h>
+#include <rte_byteorder.h>
+#include <rte_ether.h>
+
+/**
+ * @file
+ * RTE IPv4 Fragmentation
+ *
+ * Implementation of IPv4 fragmentation.
+ *
+ */
+
+/*
+ * Default byte size for the IPv4 Maximum Transfer Unit (MTU).
+ * This value includes the size of IPv4 header.
+ */
+#define IPV4_MTU_DEFAULT ETHER_MTU
+
+/*
+ * Default payload in bytes for the IPv4 packet.
+ */
+#define IPV4_DEFAULT_PAYLOAD (IPV4_MTU_DEFAULT - sizeof(struct
ipv4_hdr))
+
+/*
+ * MAX number of fragments per packet allowed.
+ */
+#define IPV4_MAX_FRAGS_PER_PACKET 0x80
+
+
+/* Debug on/off */
+#ifdef RTE_IPV4_FRAG_DEBUG
+
+#define RTE_IPV4_FRAG_ASSERT(exp)
\
+if (!(exp)) { \
+ rte_panic("function %s, line%d\tassert \"" #exp "\" failed\n", \
+ __func__, __LINE__); \
+}
+
+#else /*RTE_IPV4_FRAG_DEBUG*/
+
+#define RTE_IPV4_FRAG_ASSERT(exp) do { } while(0)
+
+#endif /*RTE_IPV4_FRAG_DEBUG*/
+
+/* Fragment Offset */
+#define IPV4_HDR_DF_SHIFT 14
+#define IPV4_HDR_MF_SHIFT 13
+#define IPV4_HDR_FO_SHIFT 3
+
+#define IPV4_HDR_DF_MASK (1 << IPV4_HDR_DF_SHIFT)
+#define IPV4_HDR_MF_MASK (1 << IPV4_HDR_MF_SHIFT)
+
+#define IPV4_HDR_FO_MASK ((1 <<
IPV4_HDR_FO_SHIFT) - 1)
+
+static inline void __fill_ipv4hdr_frag(struct ipv4_hdr *dst,
+ const struct ipv4_hdr *src, uint16_t len, uint16_t fofs,
+ uint16_t dofs, uint32_t mf)
+{
+ rte_memcpy(dst, src, sizeof(*dst));
+ fofs = (uint16_t)(fofs + (dofs >> IPV4_HDR_FO_SHIFT));
+ fofs = (uint16_t)(fofs | mf << IPV4_HDR_MF_SHIFT);
+ dst->fragment_offset = rte_cpu_to_be_16(fofs);
+ dst->total_length = rte_cpu_to_be_16(len);
+ dst->hdr_checksum = 0;
+}
+
+static inline void __free_fragments(struct rte_mbuf *mb[], uint32_t num)
+{
+ uint32_t i;
+ for (i = 0; i != num; i++)
+ rte_pktmbuf_free(mb[i]);
+}
+
+/**
+ * IPv4 fragmentation.
+ *
+ * This function implements the fragmentation of IPv4 packets.
+ *
+ * @param pkt_in
+ * The input packet.
+ * @param pkts_out
+ * Array storing the output fragments.
+ * @param mtu_size
+ * Size in bytes of the Maximum Transfer Unit (MTU) for the outgoing IPv4
+ * datagrams. This value includes the size of the IPv4 header.
+ * @param pool_direct
+ * MBUF pool used for allocating direct buffers for the output fragments.
+ * @param pool_indirect
+ * MBUF pool used for allocating indirect buffers for the output fragments.
+ * @return
+ * Upon successful completion - number of output fragments placed
+ * in the pkts_out array.
+ * Otherwise - (-1) * <errno>.
+ */
+static inline int32_t rte_ipv4_fragmentation(struct rte_mbuf *pkt_in,
+ struct rte_mbuf **pkts_out,
+ uint16_t nb_pkts_out,
+ uint16_t mtu_size,
+ struct rte_mempool *pool_direct,
+ struct rte_mempool *pool_indirect)
+{
+ struct rte_mbuf *in_seg = NULL;
+ struct ipv4_hdr *in_hdr;
+ uint32_t out_pkt_pos, in_seg_data_pos;
+ uint32_t more_in_segs;
+ uint16_t fragment_offset, flag_offset, frag_size;
+
+ frag_size = (uint16_t)(mtu_size - sizeof(struct ipv4_hdr));
+
+ /* Fragment size should be a multiply of 8. */
+ RTE_IPV4_FRAG_ASSERT((frag_size & IPV4_HDR_FO_MASK) == 0);
+
+ /* Fragment size should be a multiply of 8. */
+ RTE_IPV4_FRAG_ASSERT(IPV4_MAX_FRAGS_PER_PACKET * frag_size >=
+ (uint16_t)(pkt_in->pkt.pkt_len - sizeof (struct ipv4_hdr)));
+
+ in_hdr = (struct ipv4_hdr*) pkt_in->pkt.data;
+ flag_offset = rte_cpu_to_be_16(in_hdr->fragment_offset);
+
+ /* If Don't Fragment flag is set */
+ if (unlikely ((flag_offset & IPV4_HDR_DF_MASK) != 0))
+ return (-ENOTSUP);
+
+ /* Check that pkts_out is big enough to hold all fragments */
+ if (unlikely (frag_size * nb_pkts_out <
+ (uint16_t)(pkt_in->pkt.pkt_len - sizeof (struct ipv4_hdr))))
+ return (-EINVAL);
+
+ in_seg = pkt_in;
+ in_seg_data_pos = sizeof(struct ipv4_hdr);
+ out_pkt_pos = 0;
+ fragment_offset = 0;
+
+ more_in_segs = 1;
+ while (likely(more_in_segs)) {
+ struct rte_mbuf *out_pkt = NULL, *out_seg_prev = NULL;
+ uint32_t more_out_segs;
+ struct ipv4_hdr *out_hdr;
+
+ /* Allocate direct buffer */
+ out_pkt = rte_pktmbuf_alloc(pool_direct);
+ if (unlikely(out_pkt == NULL)) {
+ __free_fragments(pkts_out, out_pkt_pos);
+ return (-ENOMEM);
+ }
+
+ /* Reserve space for the IP header that will be built later */
+ out_pkt->pkt.data_len = sizeof(struct ipv4_hdr);
+ out_pkt->pkt.pkt_len = sizeof(struct ipv4_hdr);
+
+ out_seg_prev = out_pkt;
+ more_out_segs = 1;
+ while (likely(more_out_segs && more_in_segs)) {
+ struct rte_mbuf *out_seg = NULL;
+ uint32_t len;
+
+ /* Allocate indirect buffer */
+ out_seg = rte_pktmbuf_alloc(pool_indirect);
+ if (unlikely(out_seg == NULL)) {
+ rte_pktmbuf_free(out_pkt);
+ __free_fragments(pkts_out, out_pkt_pos);
+ return (-ENOMEM);
+ }
+ out_seg_prev->pkt.next = out_seg;
+ out_seg_prev = out_seg;
+
+ /* Prepare indirect buffer */
+ rte_pktmbuf_attach(out_seg, in_seg);
+ len = mtu_size - out_pkt->pkt.pkt_len;
+ if (len > (in_seg->pkt.data_len - in_seg_data_pos)) {
+ len = in_seg->pkt.data_len - in_seg_data_pos;
+ }
+ out_seg->pkt.data = (char*) in_seg->pkt.data +
(uint16_t)in_seg_data_pos;
+ out_seg->pkt.data_len = (uint16_t)len;
+ out_pkt->pkt.pkt_len = (uint16_t)(len +
+ out_pkt->pkt.pkt_len);
+ out_pkt->pkt.nb_segs += 1;
+ in_seg_data_pos += len;
+
+ /* Current output packet (i.e. fragment) done ? */
+ if (unlikely(out_pkt->pkt.pkt_len >= mtu_size)) {
+ more_out_segs = 0;
+ }
+
+ /* Current input segment done ? */
+ if (unlikely(in_seg_data_pos == in_seg->pkt.data_len)) {
+ in_seg = in_seg->pkt.next;
+ in_seg_data_pos = 0;
+
+ if (unlikely(in_seg == NULL)) {
+ more_in_segs = 0;
+ }
+ }
+ }
+
+ /* Build the IP header */
+
+ out_hdr = (struct ipv4_hdr*) out_pkt->pkt.data;
+
+ __fill_ipv4hdr_frag(out_hdr, in_hdr,
+ (uint16_t)out_pkt->pkt.pkt_len,
+ flag_offset, fragment_offset, more_in_segs);
+
+ fragment_offset = (uint16_t)(fragment_offset +
+ out_pkt->pkt.pkt_len - sizeof(struct ipv4_hdr));
+
+ out_pkt->ol_flags |= PKT_TX_IP_CKSUM;
+ out_pkt->pkt.vlan_macip.f.l3_len = sizeof(struct ipv4_hdr);
+
+ /* Write the fragment to the output list */
+ pkts_out[out_pkt_pos] = out_pkt;
+ out_pkt_pos ++;
+ }
+
+ return (out_pkt_pos);
+}
+
+#endif
diff --git a/lib/librte_port/rte_port_frag.c b/lib/librte_port/rte_port_frag.c
new file mode 100644
index 0000000..a2bd674
--- /dev/null
+++ b/lib/librte_port/rte_port_frag.c
@@ -0,0 +1,230 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <string.h>
+
+#include <rte_mbuf.h>
+#include <rte_ring.h>
+#include <rte_malloc.h>
+
+#include "rte_port_frag.h"
+#include "rte_ipv4_frag.h"
+
+struct rte_port_ring_reader_ipv4_frag {
+ /* Input parameters */
+ struct rte_ring *ring;
+ uint32_t mtu;
+ uint32_t metadata_size;
+ struct rte_mempool *pool_direct;
+ struct rte_mempool *pool_indirect;
+
+ /* Internal buffers */
+ struct rte_mbuf *pkts[RTE_PORT_IN_BURST_SIZE_MAX];
+ struct rte_mbuf *frags[IPV4_MAX_FRAGS_PER_PACKET];
+ uint32_t n_pkts;
+ uint32_t pos_pkts;
+ uint32_t n_frags;
+ uint32_t pos_frags;
+} __rte_cache_aligned;
+
+static void *
+rte_port_ring_reader_ipv4_frag_create(void *params, int socket_id)
+{
+ struct rte_port_ring_reader_ipv4_frag_params *conf =
+ (struct rte_port_ring_reader_ipv4_frag_params *) params;
+ struct rte_port_ring_reader_ipv4_frag *port;
+
+ /* Check input parameters */
+ if (conf == NULL) {
+ RTE_LOG(ERR, PORT, "%s: Parameter conf is NULL\n", __func__);
+ return NULL;
+ }
+ if (conf->ring == NULL) {
+ RTE_LOG(ERR, PORT, "%s: Parameter ring is NULL\n", __func__);
+ return NULL;
+ }
+ if (conf->mtu == 0) {
+ RTE_LOG(ERR, PORT, "%s: Parameter mtu is invalid\n", __func__);
+ return NULL;
+ }
+ if (conf->pool_direct == NULL) {
+ RTE_LOG(ERR, PORT, "%s: Parameter pool_direct is NULL\n",
__func__);
+ return NULL;
+ }
+ if (conf->pool_indirect == NULL) {
+ RTE_LOG(ERR, PORT, "%s: Parameter pool_indirect is NULL\n",
__func__);
+ return NULL;
+ }
+
+ /* Memory allocation */
+ port = rte_zmalloc_socket("PORT", sizeof(*port), CACHE_LINE_SIZE,
socket_id);
+ if (port == NULL) {
+ RTE_LOG(ERR, PORT, "%s: port is NULL\n", __func__);
+ return NULL;
+ }
+
+ /* Initialization */
+ port->ring = conf->ring;
+ port->mtu = conf->mtu;
+ port->metadata_size = conf->metadata_size;
+ port->pool_direct = conf->pool_direct;
+ port->pool_indirect = conf->pool_indirect;
+
+ port->n_pkts = 0;
+ port->pos_pkts = 0;
+ port->n_frags = 0;
+ port->pos_frags = 0;
+
+ return port;
+}
+
+static int
+rte_port_ring_reader_ipv4_frag_rx(void *port,
+ struct rte_mbuf **pkts,
+ uint32_t n_pkts)
+{
+ struct rte_port_ring_reader_ipv4_frag *p =
+ (struct rte_port_ring_reader_ipv4_frag *) port;
+ uint32_t n_pkts_out;
+
+ n_pkts_out = 0;
+
+ /* Get packets from the "frag" buffer */
+ if (p->n_frags >= n_pkts) {
+ memcpy(pkts, &p->frags[p->pos_frags], n_pkts * sizeof(void *));
+ p->pos_frags += n_pkts;
+ p->n_frags -= n_pkts;
+
+ return n_pkts;
+ }
+
+ memcpy(pkts, &p->frags[p->pos_frags], p->n_frags * sizeof(void *));
+ n_pkts_out = p->n_frags;
+ p->n_frags = 0;
+
+ /* Look to "pkts" buffer to get more packets */
+ for ( ; ; ) {
+ struct rte_mbuf *pkt;
+ uint32_t n_pkts_to_provide, i;
+ int status;
+
+ /* If "pkts" buffer is empty, read packet burst from ring */
+ if (p->n_pkts == 0) {
+ p->n_pkts = rte_ring_sc_dequeue_burst(p->ring, (void
**) p->pkts,
+ RTE_PORT_IN_BURST_SIZE_MAX);
+ if (p->n_pkts == 0) {
+ return n_pkts_out;
+ }
+ p->pos_pkts = 0;
+ }
+
+ /* Read next packet from "pkts" buffer */
+ pkt = p->pkts[p->pos_pkts ++];
+ p->n_pkts --;
+
+ /* If not jumbo, pass current packet to output */
+ if (pkt->pkt.pkt_len <= IPV4_MTU_DEFAULT) {
+ pkts[n_pkts_out ++] = pkt;
+
+ n_pkts_to_provide = n_pkts - n_pkts_out;
+ if (n_pkts_to_provide == 0) {
+ return n_pkts;
+ }
+ continue;
+ }
+
+ /* Fragment current packet into the "frags" buffer */
+ status = rte_ipv4_fragmentation(
+ pkt,
+ p->frags,
+ IPV4_MAX_FRAGS_PER_PACKET,
+ p->mtu,
+ p->pool_direct,
+ p->pool_indirect
+ );
+
+ if (status < 0) {
+ rte_pktmbuf_free(pkt);
+ continue;
+ }
+
+ p->n_frags = (uint32_t) status;
+ p->pos_frags = 0;
+
+ /* Copy meta-data from input jumbo packet to its fragments */
+ for (i = 0; i < p->n_frags; i ++) {
+ uint8_t *src = RTE_MBUF_METADATA_UINT8_PTR(pkt, 0);
+ uint8_t *dst = RTE_MBUF_METADATA_UINT8_PTR(p->frags[i],
0);
+
+ memcpy(dst, src, p->metadata_size);
+ }
+
+ /* Free input jumbo packet */
+ rte_pktmbuf_free(pkt);
+
+ /* Get packets from "frag" buffer */
+ n_pkts_to_provide = n_pkts - n_pkts_out;
+ if (p->n_frags >= n_pkts_to_provide) {
+ memcpy(&pkts[n_pkts_out], p->frags, n_pkts_to_provide *
sizeof(void *));
+ p->n_frags -= n_pkts_to_provide;
+ p->pos_frags += n_pkts_to_provide;
+
+ return n_pkts;
+ }
+
+ memcpy(&pkts[n_pkts_out], p->frags, p->n_frags * sizeof(void
*));
+ n_pkts_out += p->n_frags;
+ p->n_frags = 0;
+ }
+}
+
+static int
+rte_port_ring_reader_ipv4_frag_free(void *port)
+{
+ if (port == NULL) {
+ RTE_LOG(ERR, PORT, "%s: Parameter port is NULL\n", __func__);
+ return -1;
+ }
+
+ rte_free(port);
+
+ return 0;
+}
+
+/*
+ * Summary of port operations
+ */
+struct rte_port_in_ops rte_port_ring_reader_ipv4_frag_ops = {
+ .f_create = rte_port_ring_reader_ipv4_frag_create,
+ .f_free = rte_port_ring_reader_ipv4_frag_free,
+ .f_rx = rte_port_ring_reader_ipv4_frag_rx,
+};
diff --git a/lib/librte_port/rte_port_frag.h b/lib/librte_port/rte_port_frag.h
new file mode 100644
index 0000000..60f222e
--- /dev/null
+++ b/lib/librte_port/rte_port_frag.h
@@ -0,0 +1,94 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __INCLUDE_RTE_PORT_IP_FRAG_H__
+#define __INCLUDE_RTE_PORT_IP_FRAG_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @file
+ * RTE Port for IPv4 Fragmentation
+ *
+ * This port is built on top of pre-initialized single consumer rte_ring. In
+ * order to minimize the amount of packets stored in the ring at any given
+ * time, the IP fragmentation functionality is executed on ring read operation,
+ * hence this port is implemented as an input port. A regular ring_writer port
+ * can be created to write to the same ring.
+ *
+ * The packets written to the ring are either complete IP datagrams or jumbo
+ * frames (i.e. IP packets with length bigger than provided MTU value). The
+ * packets read from the ring are all non-jumbo frames. The complete IP
+ * datagrams written to the ring are not changed. The jumbo frames are
+ * fragmented into several IP packets with length less or equal to MTU.
+ *
+ ***/
+
+#include <stdint.h>
+
+#include <rte_ring.h>
+
+#include "rte_port.h"
+
+/** ring_reader_ipv4_frag port parameters */
+struct rte_port_ring_reader_ipv4_frag_params {
+ /** Underlying single consumer ring that has to be pre-initialized. */
+ struct rte_ring *ring;
+
+ /** Maximum Transfer Unit (MTU). Maximum IP packet size (in bytes). */
+ uint32_t mtu;
+
+ /** Size of application dependent meta-data stored per each input packet
+ that has to be copied to each of the fragments originating from the
+ same input IP datagram. */
+ uint32_t metadata_size;
+
+ /** Pre-initialized buffer pool used for allocating direct buffers for
the
+ output fragments. */
+ struct rte_mempool *pool_direct;
+
+ /** Pre-initialized buffer pool used for allocating indirect buffers for
+ the output fragments. */
+ struct rte_mempool *pool_indirect;
+};
+
+/** ring_reader_ipv4_frag port operations */
+extern struct rte_port_in_ops rte_port_ring_reader_ipv4_frag_ops;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
--
1.7.7.6
