1 /* SPDX-License-Identifier: BSD-3-Clause 2 * 3 * Copyright (c) 2016-2018 Solarflare Communications Inc. 4 * All rights reserved. 5 * 6 * This software was jointly developed between OKTET Labs (under contract 7 * for Solarflare) and Solarflare Communications, Inc. 8 */ 9 10 #include <rte_ip.h> 11 #include <rte_tcp.h> 12 13 #include "sfc.h" 14 #include "sfc_debug.h" 15 #include "sfc_tx.h" 16 #include "sfc_ev.h" 17 #include "sfc_tso.h" 18 19 int 20 sfc_efx_tso_alloc_tsoh_objs(struct sfc_efx_tx_sw_desc *sw_ring, 21 unsigned int txq_entries, unsigned int socket_id) 22 { 23 unsigned int i; 24 25 for (i = 0; i < txq_entries; ++i) { 26 sw_ring[i].tsoh = rte_malloc_socket("sfc-efx-txq-tsoh-obj", 27 SFC_TSOH_STD_LEN, 28 RTE_CACHE_LINE_SIZE, 29 socket_id); 30 if (sw_ring[i].tsoh == NULL) 31 goto fail_alloc_tsoh_objs; 32 } 33 34 return 0; 35 36 fail_alloc_tsoh_objs: 37 while (i > 0) 38 rte_free(sw_ring[--i].tsoh); 39 40 return ENOMEM; 41 } 42 43 void 44 sfc_efx_tso_free_tsoh_objs(struct sfc_efx_tx_sw_desc *sw_ring, 45 unsigned int txq_entries) 46 { 47 unsigned int i; 48 49 for (i = 0; i < txq_entries; ++i) { 50 rte_free(sw_ring[i].tsoh); 51 sw_ring[i].tsoh = NULL; 52 } 53 } 54 55 unsigned int 56 sfc_tso_prepare_header(uint8_t *tsoh, size_t header_len, 57 struct rte_mbuf **in_seg, size_t *in_off) 58 { 59 struct rte_mbuf *m = *in_seg; 60 size_t bytes_to_copy = 0; 61 size_t bytes_left = header_len; 62 unsigned int segments_copied = 0; 63 64 do { 65 bytes_to_copy = MIN(bytes_left, m->data_len); 66 67 rte_memcpy(tsoh, rte_pktmbuf_mtod(m, uint8_t *), 68 bytes_to_copy); 69 70 bytes_left -= bytes_to_copy; 71 tsoh += bytes_to_copy; 72 73 if (bytes_left > 0) { 74 m = m->next; 75 SFC_ASSERT(m != NULL); 76 segments_copied++; 77 } 78 } while (bytes_left > 0); 79 80 if (bytes_to_copy == m->data_len) { 81 *in_seg = m->next; 82 *in_off = 0; 83 segments_copied++; 84 } else { 85 *in_seg = m; 86 *in_off = bytes_to_copy; 87 } 88 89 return segments_copied; 90 } 91 92 int 93 sfc_efx_tso_do(struct sfc_efx_txq *txq, unsigned int idx, 94 struct rte_mbuf **in_seg, size_t *in_off, efx_desc_t **pend, 95 unsigned int *pkt_descs, size_t *pkt_len) 96 { 97 uint8_t *tsoh; 98 const struct tcp_hdr *th; 99 efsys_dma_addr_t header_paddr; 100 uint16_t packet_id; 101 uint32_t sent_seq; 102 struct rte_mbuf *m = *in_seg; 103 size_t nh_off = m->l2_len; /* IP header offset */ 104 size_t tcph_off = m->l2_len + m->l3_len; /* TCP header offset */ 105 size_t header_len = m->l2_len + m->l3_len + m->l4_len; 106 const efx_nic_cfg_t *encp = efx_nic_cfg_get(txq->evq->sa->nic); 107 108 idx += SFC_TSO_OPT_DESCS_NUM; 109 110 /* 111 * The TCP header must start at most 208 bytes into the frame. 112 * If it starts later than this then the NIC won't realise 113 * it's a TCP packet and TSO edits won't be applied 114 */ 115 if (unlikely(tcph_off > encp->enc_tx_tso_tcp_header_offset_limit)) 116 return EMSGSIZE; 117 118 header_paddr = rte_pktmbuf_iova(m); 119 120 /* 121 * Sometimes headers may be split across multiple mbufs. In such cases 122 * we need to glue those pieces and store them in some temporary place. 123 * Also, packet headers must be contiguous in memory, so that 124 * they can be referred to with a single DMA descriptor. EF10 has no 125 * limitations on address boundaries crossing by DMA descriptor data. 126 */ 127 if (m->data_len < header_len) { 128 /* 129 * Discard a packet if header linearization is needed but 130 * the header is too big. 131 */ 132 if (unlikely(header_len > SFC_TSOH_STD_LEN)) 133 return EMSGSIZE; 134 135 tsoh = txq->sw_ring[idx & txq->ptr_mask].tsoh; 136 sfc_tso_prepare_header(tsoh, header_len, in_seg, in_off); 137 138 header_paddr = rte_malloc_virt2iova((void *)tsoh); 139 } else { 140 if (m->data_len == header_len) { 141 *in_off = 0; 142 *in_seg = m->next; 143 } else { 144 *in_off = header_len; 145 } 146 147 tsoh = rte_pktmbuf_mtod(m, uint8_t *); 148 } 149 150 /* Handle IP header */ 151 if (m->ol_flags & PKT_TX_IPV4) { 152 const struct ipv4_hdr *iphe4; 153 154 iphe4 = (const struct ipv4_hdr *)(tsoh + nh_off); 155 rte_memcpy(&packet_id, &iphe4->packet_id, sizeof(uint16_t)); 156 packet_id = rte_be_to_cpu_16(packet_id); 157 } else if (m->ol_flags & PKT_TX_IPV6) { 158 packet_id = 0; 159 } else { 160 return EINVAL; 161 } 162 163 /* Handle TCP header */ 164 th = (const struct tcp_hdr *)(tsoh + tcph_off); 165 166 rte_memcpy(&sent_seq, &th->sent_seq, sizeof(uint32_t)); 167 sent_seq = rte_be_to_cpu_32(sent_seq); 168 169 efx_tx_qdesc_tso2_create(txq->common, packet_id, 0, sent_seq, 170 m->tso_segsz, 171 *pend, EFX_TX_FATSOV2_OPT_NDESCS); 172 173 *pend += EFX_TX_FATSOV2_OPT_NDESCS; 174 *pkt_descs += EFX_TX_FATSOV2_OPT_NDESCS; 175 176 efx_tx_qdesc_dma_create(txq->common, header_paddr, header_len, 177 B_FALSE, (*pend)++); 178 (*pkt_descs)++; 179 *pkt_len -= header_len; 180 181 return 0; 182 } 183