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1 | /* SPDX-License-Identifier: BSD-3-Clause |
2 | * Copyright(c) 2017 Intel Corporation | |
3 | */ | |
4 | ||
5 | #ifndef _GSO_COMMON_H_ | |
6 | #define _GSO_COMMON_H_ | |
7 | ||
8 | #include <stdint.h> | |
9 | ||
10 | #include <rte_mbuf.h> | |
11 | #include <rte_ip.h> | |
12 | #include <rte_tcp.h> | |
13 | #include <rte_udp.h> | |
14 | ||
15 | #define IS_FRAGMENTED(frag_off) (((frag_off) & IPV4_HDR_OFFSET_MASK) != 0 \ | |
16 | || ((frag_off) & IPV4_HDR_MF_FLAG) == IPV4_HDR_MF_FLAG) | |
17 | ||
18 | #define TCP_HDR_PSH_MASK ((uint8_t)0x08) | |
19 | #define TCP_HDR_FIN_MASK ((uint8_t)0x01) | |
20 | ||
21 | #define IS_IPV4_TCP(flag) (((flag) & (PKT_TX_TCP_SEG | PKT_TX_IPV4)) == \ | |
22 | (PKT_TX_TCP_SEG | PKT_TX_IPV4)) | |
23 | ||
24 | #define IS_IPV4_VXLAN_TCP4(flag) (((flag) & (PKT_TX_TCP_SEG | PKT_TX_IPV4 | \ | |
9f95a23c | 25 | PKT_TX_OUTER_IPV4 | PKT_TX_TUNNEL_MASK)) == \ |
11fdf7f2 TL |
26 | (PKT_TX_TCP_SEG | PKT_TX_IPV4 | PKT_TX_OUTER_IPV4 | \ |
27 | PKT_TX_TUNNEL_VXLAN)) | |
28 | ||
29 | #define IS_IPV4_GRE_TCP4(flag) (((flag) & (PKT_TX_TCP_SEG | PKT_TX_IPV4 | \ | |
9f95a23c | 30 | PKT_TX_OUTER_IPV4 | PKT_TX_TUNNEL_MASK)) == \ |
11fdf7f2 TL |
31 | (PKT_TX_TCP_SEG | PKT_TX_IPV4 | PKT_TX_OUTER_IPV4 | \ |
32 | PKT_TX_TUNNEL_GRE)) | |
33 | ||
34 | #define IS_IPV4_UDP(flag) (((flag) & (PKT_TX_UDP_SEG | PKT_TX_IPV4)) == \ | |
35 | (PKT_TX_UDP_SEG | PKT_TX_IPV4)) | |
36 | ||
37 | /** | |
38 | * Internal function which updates the UDP header of a packet, following | |
39 | * segmentation. This is required to update the header's datagram length field. | |
40 | * | |
41 | * @param pkt | |
42 | * The packet containing the UDP header. | |
43 | * @param udp_offset | |
44 | * The offset of the UDP header from the start of the packet. | |
45 | */ | |
46 | static inline void | |
47 | update_udp_header(struct rte_mbuf *pkt, uint16_t udp_offset) | |
48 | { | |
49 | struct udp_hdr *udp_hdr; | |
50 | ||
51 | udp_hdr = (struct udp_hdr *)(rte_pktmbuf_mtod(pkt, char *) + | |
52 | udp_offset); | |
53 | udp_hdr->dgram_len = rte_cpu_to_be_16(pkt->pkt_len - udp_offset); | |
54 | } | |
55 | ||
56 | /** | |
57 | * Internal function which updates the TCP header of a packet, following | |
58 | * segmentation. This is required to update the header's 'sent' sequence | |
59 | * number, and also to clear 'PSH' and 'FIN' flags for non-tail segments. | |
60 | * | |
61 | * @param pkt | |
62 | * The packet containing the TCP header. | |
63 | * @param l4_offset | |
64 | * The offset of the TCP header from the start of the packet. | |
65 | * @param sent_seq | |
66 | * The sent sequence number. | |
67 | * @param non-tail | |
68 | * Indicates whether or not this is a tail segment. | |
69 | */ | |
70 | static inline void | |
71 | update_tcp_header(struct rte_mbuf *pkt, uint16_t l4_offset, uint32_t sent_seq, | |
72 | uint8_t non_tail) | |
73 | { | |
74 | struct tcp_hdr *tcp_hdr; | |
75 | ||
76 | tcp_hdr = (struct tcp_hdr *)(rte_pktmbuf_mtod(pkt, char *) + | |
77 | l4_offset); | |
78 | tcp_hdr->sent_seq = rte_cpu_to_be_32(sent_seq); | |
79 | if (likely(non_tail)) | |
80 | tcp_hdr->tcp_flags &= (~(TCP_HDR_PSH_MASK | | |
81 | TCP_HDR_FIN_MASK)); | |
82 | } | |
83 | ||
84 | /** | |
85 | * Internal function which updates the IPv4 header of a packet, following | |
86 | * segmentation. This is required to update the header's 'total_length' field, | |
87 | * to reflect the reduced length of the now-segmented packet. Furthermore, the | |
88 | * header's 'packet_id' field must be updated to reflect the new ID of the | |
89 | * now-segmented packet. | |
90 | * | |
91 | * @param pkt | |
92 | * The packet containing the IPv4 header. | |
93 | * @param l3_offset | |
94 | * The offset of the IPv4 header from the start of the packet. | |
95 | * @param id | |
96 | * The new ID of the packet. | |
97 | */ | |
98 | static inline void | |
99 | update_ipv4_header(struct rte_mbuf *pkt, uint16_t l3_offset, uint16_t id) | |
100 | { | |
101 | struct ipv4_hdr *ipv4_hdr; | |
102 | ||
103 | ipv4_hdr = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char *) + | |
104 | l3_offset); | |
105 | ipv4_hdr->total_length = rte_cpu_to_be_16(pkt->pkt_len - l3_offset); | |
106 | ipv4_hdr->packet_id = rte_cpu_to_be_16(id); | |
107 | } | |
108 | ||
109 | /** | |
110 | * Internal function which divides the input packet into small segments. | |
111 | * Each of the newly-created segments is organized as a two-segment MBUF, | |
112 | * where the first segment is a standard mbuf, which stores a copy of | |
113 | * packet header, and the second is an indirect mbuf which points to a | |
114 | * section of data in the input packet. | |
115 | * | |
116 | * @param pkt | |
117 | * Packet to segment. | |
118 | * @param pkt_hdr_offset | |
119 | * Packet header offset, measured in bytes. | |
120 | * @param pyld_unit_size | |
121 | * The max payload length of a GSO segment. | |
122 | * @param direct_pool | |
123 | * MBUF pool used for allocating direct buffers for output segments. | |
124 | * @param indirect_pool | |
125 | * MBUF pool used for allocating indirect buffers for output segments. | |
126 | * @param pkts_out | |
127 | * Pointer array used to keep the mbuf addresses of output segments. If | |
128 | * the memory space in pkts_out is insufficient, gso_do_segment() fails | |
129 | * and returns -EINVAL. | |
130 | * @param nb_pkts_out | |
131 | * The max number of items that pkts_out can keep. | |
132 | * | |
133 | * @return | |
134 | * - The number of segments created in the event of success. | |
135 | * - Return -ENOMEM if run out of memory in MBUF pools. | |
136 | * - Return -EINVAL for invalid parameters. | |
137 | */ | |
138 | int gso_do_segment(struct rte_mbuf *pkt, | |
139 | uint16_t pkt_hdr_offset, | |
140 | uint16_t pyld_unit_size, | |
141 | struct rte_mempool *direct_pool, | |
142 | struct rte_mempool *indirect_pool, | |
143 | struct rte_mbuf **pkts_out, | |
144 | uint16_t nb_pkts_out); | |
145 | #endif |