summaryrefslogtreecommitdiff
path: root/lib/librte_gso
diff options
context:
space:
mode:
authorJiayu Hu <jiayu.hu@intel.com>2017-10-07 22:56:40 +0800
committerFerruh Yigit <ferruh.yigit@intel.com>2017-10-12 01:36:57 +0100
commit119583797b6ae44990934d7b965e76463530ca7a (patch)
treed3ccf61f48411031add1cbe8c26fac3178c1bc7a /lib/librte_gso
parentec51443cc99a6e20e8e2210d92d59ae760971f90 (diff)
downloaddpdk-119583797b6ae44990934d7b965e76463530ca7a.zip
dpdk-119583797b6ae44990934d7b965e76463530ca7a.tar.gz
dpdk-119583797b6ae44990934d7b965e76463530ca7a.tar.xz
gso: support TCP/IPv4 GSO
This patch adds GSO support for TCP/IPv4 packets. Supported packets may include a single VLAN tag. TCP/IPv4 GSO doesn't check if input packets have correct checksums, and doesn't update checksums for output packets (the responsibility for this lies with the application). Additionally, TCP/IPv4 GSO doesn't process IP fragmented packets. TCP/IPv4 GSO uses two chained MBUFs, one direct MBUF and one indrect MBUF, to organize an output packet. Note that we refer to these two chained MBUFs as a two-segment MBUF. The direct MBUF stores the packet header, while the indirect mbuf simply points to a location within the original packet's payload. Consequently, use of the GSO library requires multi-segment MBUF support in the TX functions of the NIC driver. If a packet is GSO'd, TCP/IPv4 GSO reduces its MBUF refcnt by 1. As a result, when all of its GSOed segments are freed, the packet is freed automatically. Signed-off-by: Jiayu Hu <jiayu.hu@intel.com> Signed-off-by: Mark Kavanagh <mark.b.kavanagh@intel.com> Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com> Tested-by: Lei Yao <lei.a.yao@intel.com>
Diffstat (limited to 'lib/librte_gso')
-rw-r--r--lib/librte_gso/Makefile2
-rw-r--r--lib/librte_gso/gso_common.c153
-rw-r--r--lib/librte_gso/gso_common.h141
-rw-r--r--lib/librte_gso/gso_tcp4.c102
-rw-r--r--lib/librte_gso/gso_tcp4.h74
-rw-r--r--lib/librte_gso/rte_gso.c53
-rw-r--r--lib/librte_gso/rte_gso.h7
7 files changed, 527 insertions, 5 deletions
diff --git a/lib/librte_gso/Makefile b/lib/librte_gso/Makefile
index aeaacbc..2be64d1 100644
--- a/lib/librte_gso/Makefile
+++ b/lib/librte_gso/Makefile
@@ -42,6 +42,8 @@ LIBABIVER := 1
#source files
SRCS-$(CONFIG_RTE_LIBRTE_GSO) += rte_gso.c
+SRCS-$(CONFIG_RTE_LIBRTE_GSO) += gso_common.c
+SRCS-$(CONFIG_RTE_LIBRTE_GSO) += gso_tcp4.c
# install this header file
SYMLINK-$(CONFIG_RTE_LIBRTE_GSO)-include += rte_gso.h
diff --git a/lib/librte_gso/gso_common.c b/lib/librte_gso/gso_common.c
new file mode 100644
index 0000000..ee75d4c
--- /dev/null
+++ b/lib/librte_gso/gso_common.c
@@ -0,0 +1,153 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2017 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 <stdbool.h>
+#include <errno.h>
+
+#include <rte_memcpy.h>
+#include <rte_mempool.h>
+
+#include "gso_common.h"
+
+static inline void
+hdr_segment_init(struct rte_mbuf *hdr_segment, struct rte_mbuf *pkt,
+ uint16_t pkt_hdr_offset)
+{
+ /* Copy MBUF metadata */
+ hdr_segment->nb_segs = 1;
+ hdr_segment->port = pkt->port;
+ hdr_segment->ol_flags = pkt->ol_flags;
+ hdr_segment->packet_type = pkt->packet_type;
+ hdr_segment->pkt_len = pkt_hdr_offset;
+ hdr_segment->data_len = pkt_hdr_offset;
+ hdr_segment->tx_offload = pkt->tx_offload;
+
+ /* Copy the packet header */
+ rte_memcpy(rte_pktmbuf_mtod(hdr_segment, char *),
+ rte_pktmbuf_mtod(pkt, char *),
+ pkt_hdr_offset);
+}
+
+static inline void
+free_gso_segment(struct rte_mbuf **pkts, uint16_t nb_pkts)
+{
+ uint16_t i;
+
+ for (i = 0; i < nb_pkts; i++)
+ rte_pktmbuf_free(pkts[i]);
+}
+
+int
+gso_do_segment(struct rte_mbuf *pkt,
+ uint16_t pkt_hdr_offset,
+ uint16_t pyld_unit_size,
+ struct rte_mempool *direct_pool,
+ struct rte_mempool *indirect_pool,
+ struct rte_mbuf **pkts_out,
+ uint16_t nb_pkts_out)
+{
+ struct rte_mbuf *pkt_in;
+ struct rte_mbuf *hdr_segment, *pyld_segment, *prev_segment;
+ uint16_t pkt_in_data_pos, segment_bytes_remaining;
+ uint16_t pyld_len, nb_segs;
+ bool more_in_pkt, more_out_segs;
+
+ pkt_in = pkt;
+ nb_segs = 0;
+ more_in_pkt = 1;
+ pkt_in_data_pos = pkt_hdr_offset;
+
+ while (more_in_pkt) {
+ if (unlikely(nb_segs >= nb_pkts_out)) {
+ free_gso_segment(pkts_out, nb_segs);
+ return -EINVAL;
+ }
+
+ /* Allocate a direct MBUF */
+ hdr_segment = rte_pktmbuf_alloc(direct_pool);
+ if (unlikely(hdr_segment == NULL)) {
+ free_gso_segment(pkts_out, nb_segs);
+ return -ENOMEM;
+ }
+ /* Fill the packet header */
+ hdr_segment_init(hdr_segment, pkt, pkt_hdr_offset);
+
+ prev_segment = hdr_segment;
+ segment_bytes_remaining = pyld_unit_size;
+ more_out_segs = 1;
+
+ while (more_out_segs && more_in_pkt) {
+ /* Allocate an indirect MBUF */
+ pyld_segment = rte_pktmbuf_alloc(indirect_pool);
+ if (unlikely(pyld_segment == NULL)) {
+ rte_pktmbuf_free(hdr_segment);
+ free_gso_segment(pkts_out, nb_segs);
+ return -ENOMEM;
+ }
+ /* Attach to current MBUF segment of pkt */
+ rte_pktmbuf_attach(pyld_segment, pkt_in);
+
+ prev_segment->next = pyld_segment;
+ prev_segment = pyld_segment;
+
+ pyld_len = segment_bytes_remaining;
+ if (pyld_len + pkt_in_data_pos > pkt_in->data_len)
+ pyld_len = pkt_in->data_len - pkt_in_data_pos;
+
+ pyld_segment->data_off = pkt_in_data_pos +
+ pkt_in->data_off;
+ pyld_segment->data_len = pyld_len;
+
+ /* Update header segment */
+ hdr_segment->pkt_len += pyld_len;
+ hdr_segment->nb_segs++;
+
+ pkt_in_data_pos += pyld_len;
+ segment_bytes_remaining -= pyld_len;
+
+ /* Finish processing a MBUF segment of pkt */
+ if (pkt_in_data_pos == pkt_in->data_len) {
+ pkt_in = pkt_in->next;
+ pkt_in_data_pos = 0;
+ if (pkt_in == NULL)
+ more_in_pkt = 0;
+ }
+
+ /* Finish generating a GSO segment */
+ if (segment_bytes_remaining == 0)
+ more_out_segs = 0;
+ }
+ pkts_out[nb_segs++] = hdr_segment;
+ }
+ return nb_segs;
+}
diff --git a/lib/librte_gso/gso_common.h b/lib/librte_gso/gso_common.h
new file mode 100644
index 0000000..a8ad638
--- /dev/null
+++ b/lib/librte_gso/gso_common.h
@@ -0,0 +1,141 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2017 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 _GSO_COMMON_H_
+#define _GSO_COMMON_H_
+
+#include <stdint.h>
+
+#include <rte_mbuf.h>
+#include <rte_ip.h>
+#include <rte_tcp.h>
+
+#define IS_FRAGMENTED(frag_off) (((frag_off) & IPV4_HDR_OFFSET_MASK) != 0 \
+ || ((frag_off) & IPV4_HDR_MF_FLAG) == IPV4_HDR_MF_FLAG)
+
+#define TCP_HDR_PSH_MASK ((uint8_t)0x08)
+#define TCP_HDR_FIN_MASK ((uint8_t)0x01)
+
+#define IS_IPV4_TCP(flag) (((flag) & (PKT_TX_TCP_SEG | PKT_TX_IPV4)) == \
+ (PKT_TX_TCP_SEG | PKT_TX_IPV4))
+
+/**
+ * Internal function which updates the TCP header of a packet, following
+ * segmentation. This is required to update the header's 'sent' sequence
+ * number, and also to clear 'PSH' and 'FIN' flags for non-tail segments.
+ *
+ * @param pkt
+ * The packet containing the TCP header.
+ * @param l4_offset
+ * The offset of the TCP header from the start of the packet.
+ * @param sent_seq
+ * The sent sequence number.
+ * @param non-tail
+ * Indicates whether or not this is a tail segment.
+ */
+static inline void
+update_tcp_header(struct rte_mbuf *pkt, uint16_t l4_offset, uint32_t sent_seq,
+ uint8_t non_tail)
+{
+ struct tcp_hdr *tcp_hdr;
+
+ tcp_hdr = (struct tcp_hdr *)(rte_pktmbuf_mtod(pkt, char *) +
+ l4_offset);
+ tcp_hdr->sent_seq = rte_cpu_to_be_32(sent_seq);
+ if (likely(non_tail))
+ tcp_hdr->tcp_flags &= (~(TCP_HDR_PSH_MASK |
+ TCP_HDR_FIN_MASK));
+}
+
+/**
+ * Internal function which updates the IPv4 header of a packet, following
+ * segmentation. This is required to update the header's 'total_length' field,
+ * to reflect the reduced length of the now-segmented packet. Furthermore, the
+ * header's 'packet_id' field must be updated to reflect the new ID of the
+ * now-segmented packet.
+ *
+ * @param pkt
+ * The packet containing the IPv4 header.
+ * @param l3_offset
+ * The offset of the IPv4 header from the start of the packet.
+ * @param id
+ * The new ID of the packet.
+ */
+static inline void
+update_ipv4_header(struct rte_mbuf *pkt, uint16_t l3_offset, uint16_t id)
+{
+ struct ipv4_hdr *ipv4_hdr;
+
+ ipv4_hdr = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char *) +
+ l3_offset);
+ ipv4_hdr->total_length = rte_cpu_to_be_16(pkt->pkt_len - l3_offset);
+ ipv4_hdr->packet_id = rte_cpu_to_be_16(id);
+}
+
+/**
+ * Internal function which divides the input packet into small segments.
+ * Each of the newly-created segments is organized as a two-segment MBUF,
+ * where the first segment is a standard mbuf, which stores a copy of
+ * packet header, and the second is an indirect mbuf which points to a
+ * section of data in the input packet.
+ *
+ * @param pkt
+ * Packet to segment.
+ * @param pkt_hdr_offset
+ * Packet header offset, measured in bytes.
+ * @param pyld_unit_size
+ * The max payload length of a GSO segment.
+ * @param direct_pool
+ * MBUF pool used for allocating direct buffers for output segments.
+ * @param indirect_pool
+ * MBUF pool used for allocating indirect buffers for output segments.
+ * @param pkts_out
+ * Pointer array used to keep the mbuf addresses of output segments. If
+ * the memory space in pkts_out is insufficient, gso_do_segment() fails
+ * and returns -EINVAL.
+ * @param nb_pkts_out
+ * The max number of items that pkts_out can keep.
+ *
+ * @return
+ * - The number of segments created in the event of success.
+ * - Return -ENOMEM if run out of memory in MBUF pools.
+ * - Return -EINVAL for invalid parameters.
+ */
+int gso_do_segment(struct rte_mbuf *pkt,
+ uint16_t pkt_hdr_offset,
+ uint16_t pyld_unit_size,
+ struct rte_mempool *direct_pool,
+ struct rte_mempool *indirect_pool,
+ struct rte_mbuf **pkts_out,
+ uint16_t nb_pkts_out);
+#endif
diff --git a/lib/librte_gso/gso_tcp4.c b/lib/librte_gso/gso_tcp4.c
new file mode 100644
index 0000000..0c628cb
--- /dev/null
+++ b/lib/librte_gso/gso_tcp4.c
@@ -0,0 +1,102 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2017 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 "gso_common.h"
+#include "gso_tcp4.h"
+
+static void
+update_ipv4_tcp_headers(struct rte_mbuf *pkt, uint8_t ipid_delta,
+ struct rte_mbuf **segs, uint16_t nb_segs)
+{
+ struct ipv4_hdr *ipv4_hdr;
+ struct tcp_hdr *tcp_hdr;
+ uint32_t sent_seq;
+ uint16_t id, tail_idx, i;
+ uint16_t l3_offset = pkt->l2_len;
+ uint16_t l4_offset = l3_offset + pkt->l3_len;
+
+ ipv4_hdr = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char*) +
+ l3_offset);
+ tcp_hdr = (struct tcp_hdr *)((char *)ipv4_hdr + pkt->l3_len);
+ id = rte_be_to_cpu_16(ipv4_hdr->packet_id);
+ sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq);
+ tail_idx = nb_segs - 1;
+
+ for (i = 0; i < nb_segs; i++) {
+ update_ipv4_header(segs[i], l3_offset, id);
+ update_tcp_header(segs[i], l4_offset, sent_seq, i < tail_idx);
+ id += ipid_delta;
+ sent_seq += (segs[i]->pkt_len - segs[i]->data_len);
+ }
+}
+
+int
+gso_tcp4_segment(struct rte_mbuf *pkt,
+ uint16_t gso_size,
+ uint8_t ipid_delta,
+ struct rte_mempool *direct_pool,
+ struct rte_mempool *indirect_pool,
+ struct rte_mbuf **pkts_out,
+ uint16_t nb_pkts_out)
+{
+ struct ipv4_hdr *ipv4_hdr;
+ uint16_t pyld_unit_size, hdr_offset;
+ uint16_t frag_off;
+ int ret;
+
+ /* Don't process the fragmented packet */
+ ipv4_hdr = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char *) +
+ pkt->l2_len);
+ frag_off = rte_be_to_cpu_16(ipv4_hdr->fragment_offset);
+ if (unlikely(IS_FRAGMENTED(frag_off))) {
+ pkts_out[0] = pkt;
+ return 1;
+ }
+
+ /* Don't process the packet without data */
+ hdr_offset = pkt->l2_len + pkt->l3_len + pkt->l4_len;
+ if (unlikely(hdr_offset >= pkt->pkt_len)) {
+ pkts_out[0] = pkt;
+ return 1;
+ }
+
+ pyld_unit_size = gso_size - hdr_offset;
+
+ /* Segment the payload */
+ ret = gso_do_segment(pkt, hdr_offset, pyld_unit_size, direct_pool,
+ indirect_pool, pkts_out, nb_pkts_out);
+ if (ret > 1)
+ update_ipv4_tcp_headers(pkt, ipid_delta, pkts_out, ret);
+
+ return ret;
+}
diff --git a/lib/librte_gso/gso_tcp4.h b/lib/librte_gso/gso_tcp4.h
new file mode 100644
index 0000000..1c57441
--- /dev/null
+++ b/lib/librte_gso/gso_tcp4.h
@@ -0,0 +1,74 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2017 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 _GSO_TCP4_H_
+#define _GSO_TCP4_H_
+
+#include <stdint.h>
+#include <rte_mbuf.h>
+
+/**
+ * Segment an IPv4/TCP packet. This function doesn't check if the input
+ * packet has correct checksums, and doesn't update checksums for output
+ * GSO segments. Furthermore, it doesn't process IP fragment packets.
+ *
+ * @param pkt
+ * The packet mbuf to segment.
+ * @param gso_size
+ * The max length of a GSO segment, measured in bytes.
+ * @param ipid_delta
+ * The increasing unit of IP ids.
+ * @param direct_pool
+ * MBUF pool used for allocating direct buffers for output segments.
+ * @param indirect_pool
+ * MBUF pool used for allocating indirect buffers for output segments.
+ * @param pkts_out
+ * Pointer array used to store the MBUF addresses of output GSO
+ * segments, when the function succeeds. If the memory space in
+ * pkts_out is insufficient, it fails and returns -EINVAL.
+ * @param nb_pkts_out
+ * The max number of items that 'pkts_out' can keep.
+ *
+ * @return
+ * - The number of GSO segments filled in pkts_out on success.
+ * - Return -ENOMEM if run out of memory in MBUF pools.
+ * - Return -EINVAL for invalid parameters.
+ */
+int gso_tcp4_segment(struct rte_mbuf *pkt,
+ uint16_t gso_size,
+ uint8_t ip_delta,
+ struct rte_mempool *direct_pool,
+ struct rte_mempool *indirect_pool,
+ struct rte_mbuf **pkts_out,
+ uint16_t nb_pkts_out);
+#endif
diff --git a/lib/librte_gso/rte_gso.c b/lib/librte_gso/rte_gso.c
index b773636..822693f 100644
--- a/lib/librte_gso/rte_gso.c
+++ b/lib/librte_gso/rte_gso.c
@@ -33,7 +33,12 @@
#include <errno.h>
+#include <rte_log.h>
+#include <rte_ethdev.h>
+
#include "rte_gso.h"
+#include "gso_common.h"
+#include "gso_tcp4.h"
int
rte_gso_segment(struct rte_mbuf *pkt,
@@ -41,12 +46,52 @@ rte_gso_segment(struct rte_mbuf *pkt,
struct rte_mbuf **pkts_out,
uint16_t nb_pkts_out)
{
+ struct rte_mempool *direct_pool, *indirect_pool;
+ struct rte_mbuf *pkt_seg;
+ uint64_t ol_flags;
+ uint16_t gso_size;
+ uint8_t ipid_delta;
+ int ret = 1;
+
if (pkt == NULL || pkts_out == NULL || gso_ctx == NULL ||
- nb_pkts_out < 1)
+ nb_pkts_out < 1 ||
+ gso_ctx->gso_size < RTE_GSO_SEG_SIZE_MIN ||
+ gso_ctx->gso_types != DEV_TX_OFFLOAD_TCP_TSO)
return -EINVAL;
- pkt->ol_flags &= (~PKT_TX_TCP_SEG);
- pkts_out[0] = pkt;
+ if (gso_ctx->gso_size >= pkt->pkt_len) {
+ pkt->ol_flags &= (~PKT_TX_TCP_SEG);
+ pkts_out[0] = pkt;
+ return 1;
+ }
+
+ direct_pool = gso_ctx->direct_pool;
+ indirect_pool = gso_ctx->indirect_pool;
+ gso_size = gso_ctx->gso_size;
+ ipid_delta = (gso_ctx->flag != RTE_GSO_FLAG_IPID_FIXED);
+ ol_flags = pkt->ol_flags;
+
+ if (IS_IPV4_TCP(pkt->ol_flags)) {
+ pkt->ol_flags &= (~PKT_TX_TCP_SEG);
+ ret = gso_tcp4_segment(pkt, gso_size, ipid_delta,
+ direct_pool, indirect_pool,
+ pkts_out, nb_pkts_out);
+ } else {
+ pkts_out[0] = pkt;
+ RTE_LOG(DEBUG, GSO, "Unsupported packet type\n");
+ return 1;
+ }
+
+ if (ret > 1) {
+ pkt_seg = pkt;
+ while (pkt_seg) {
+ rte_mbuf_refcnt_update(pkt_seg, -1);
+ pkt_seg = pkt_seg->next;
+ }
+ } else if (ret < 0) {
+ /* Revert the ol_flags in the event of failure. */
+ pkt->ol_flags = ol_flags;
+ }
- return 1;
+ return ret;
}
diff --git a/lib/librte_gso/rte_gso.h b/lib/librte_gso/rte_gso.h
index 9d3b4fc..4b77176 100644
--- a/lib/librte_gso/rte_gso.h
+++ b/lib/librte_gso/rte_gso.h
@@ -46,6 +46,10 @@ extern "C" {
#include <stdint.h>
#include <rte_mbuf.h>
+/* Minimum GSO segment size. */
+#define RTE_GSO_SEG_SIZE_MIN (sizeof(struct ether_hdr) + \
+ sizeof(struct ipv4_hdr) + sizeof(struct tcp_hdr) + 1)
+
/* GSO flags for rte_gso_ctx. */
#define RTE_GSO_FLAG_IPID_FIXED (1ULL << 0)
/**< Use fixed IP ids for output GSO segments. Setting
@@ -81,7 +85,8 @@ struct rte_gso_ctx {
*/
uint16_t gso_size;
/**< maximum size of an output GSO segment, including packet
- * header and payload, measured in bytes.
+ * header and payload, measured in bytes. Must exceed
+ * RTE_GSO_SEG_SIZE_MIN.
*/
};