ceph/src/spdk/dpdk/drivers/net/iavf/iavf_rxtx_vec_common.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2017 Intel Corporation
   3  */
   4
   5 #ifndef _IAVF_RXTX_VEC_COMMON_H_
   6 #define _IAVF_RXTX_VEC_COMMON_H_
   7 #include <stdint.h>
   8 #include <rte_ethdev_driver.h>
   9 #include <rte_malloc.h>
  10
  11 #include "iavf.h"
  12 #include "iavf_rxtx.h"
  13
  14 static inline uint16_t
  15 reassemble_packets(struct iavf_rx_queue *rxq, struct rte_mbuf **rx_bufs,
  16                    uint16_t nb_bufs, uint8_t *split_flags)
  17 {
  18         struct rte_mbuf *pkts[IAVF_VPMD_RX_MAX_BURST];
  19         struct rte_mbuf *start = rxq->pkt_first_seg;
  20         struct rte_mbuf *end =  rxq->pkt_last_seg;
  21         unsigned int pkt_idx, buf_idx;
  22
  23         for (buf_idx = 0, pkt_idx = 0; buf_idx < nb_bufs; buf_idx++) {
  24                 if (end) {
  25                         /* processing a split packet */
  26                         end->next = rx_bufs[buf_idx];
  27                         rx_bufs[buf_idx]->data_len += rxq->crc_len;
  28
  29                         start->nb_segs++;
  30                         start->pkt_len += rx_bufs[buf_idx]->data_len;
  31                         end = end->next;
  32
  33                         if (!split_flags[buf_idx]) {
  34                                 /* it's the last packet of the set */
  35                                 start->hash = end->hash;
  36                                 start->ol_flags = end->ol_flags;
  37                                 /* we need to strip crc for the whole packet */
  38                                 start->pkt_len -= rxq->crc_len;
  39                                 if (end->data_len > rxq->crc_len) {
  40                                         end->data_len -= rxq->crc_len;
  41                                 } else {
  42                                         /* free up last mbuf */
  43                                         struct rte_mbuf *secondlast = start;
  44
  45                                         start->nb_segs--;
  46                                         while (secondlast->next != end)
  47                                                 secondlast = secondlast->next;
  48                                         secondlast->data_len -= (rxq->crc_len -
  49                                                         end->data_len);
  50                                         secondlast->next = NULL;
  51                                         rte_pktmbuf_free_seg(end);
  52                                 }
  53                                 pkts[pkt_idx++] = start;
  54                                 start = NULL;
  55                                 end = NULL;
  56                         }
  57                 } else {
  58                         /* not processing a split packet */
  59                         if (!split_flags[buf_idx]) {
  60                                 /* not a split packet, save and skip */
  61                                 pkts[pkt_idx++] = rx_bufs[buf_idx];
  62                                 continue;
  63                         }
  64                         end = start = rx_bufs[buf_idx];
  65                         rx_bufs[buf_idx]->data_len += rxq->crc_len;
  66                         rx_bufs[buf_idx]->pkt_len += rxq->crc_len;
  67                 }
  68         }
  69
  70         /* save the partial packet for next time */
  71         rxq->pkt_first_seg = start;
  72         rxq->pkt_last_seg = end;
  73         memcpy(rx_bufs, pkts, pkt_idx * (sizeof(*pkts)));
  74         return pkt_idx;
  75 }
  76
  77 static __rte_always_inline int
  78 iavf_tx_free_bufs(struct iavf_tx_queue *txq)
  79 {
  80         struct iavf_tx_entry *txep;
  81         uint32_t n;
  82         uint32_t i;
  83         int nb_free = 0;
  84         struct rte_mbuf *m, *free[IAVF_VPMD_TX_MAX_FREE_BUF];
  85
  86         /* check DD bits on threshold descriptor */
  87         if ((txq->tx_ring[txq->next_dd].cmd_type_offset_bsz &
  88                         rte_cpu_to_le_64(IAVF_TXD_QW1_DTYPE_MASK)) !=
  89                         rte_cpu_to_le_64(IAVF_TX_DESC_DTYPE_DESC_DONE))
  90                 return 0;
  91
  92         n = txq->rs_thresh;
  93
  94          /* first buffer to free from S/W ring is at index
  95           * tx_next_dd - (tx_rs_thresh-1)
  96           */
  97         txep = &txq->sw_ring[txq->next_dd - (n - 1)];
  98         m = rte_pktmbuf_prefree_seg(txep[0].mbuf);
  99         if (likely(m != NULL)) {
 100                 free[0] = m;
 101                 nb_free = 1;
 102                 for (i = 1; i < n; i++) {
 103                         m = rte_pktmbuf_prefree_seg(txep[i].mbuf);
 104                         if (likely(m != NULL)) {
 105                                 if (likely(m->pool == free[0]->pool)) {
 106                                         free[nb_free++] = m;
 107                                 } else {
 108                                         rte_mempool_put_bulk(free[0]->pool,
 109                                                              (void *)free,
 110                                                              nb_free);
 111                                         free[0] = m;
 112                                         nb_free = 1;
 113                                 }
 114                         }
 115                 }
 116                 rte_mempool_put_bulk(free[0]->pool, (void **)free, nb_free);
 117         } else {
 118                 for (i = 1; i < n; i++) {
 119                         m = rte_pktmbuf_prefree_seg(txep[i].mbuf);
 120                         if (m)
 121                                 rte_mempool_put(m->pool, m);
 122                 }
 123         }
 124
 125         /* buffers were freed, update counters */
 126         txq->nb_free = (uint16_t)(txq->nb_free + txq->rs_thresh);
 127         txq->next_dd = (uint16_t)(txq->next_dd + txq->rs_thresh);
 128         if (txq->next_dd >= txq->nb_tx_desc)
 129                 txq->next_dd = (uint16_t)(txq->rs_thresh - 1);
 130
 131         return txq->rs_thresh;
 132 }
 133
 134 static __rte_always_inline void
 135 tx_backlog_entry(struct iavf_tx_entry *txep,
 136                  struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 137 {
 138         int i;
 139
 140         for (i = 0; i < (int)nb_pkts; ++i)
 141                 txep[i].mbuf = tx_pkts[i];
 142 }
 143
 144 static inline void
 145 _iavf_rx_queue_release_mbufs_vec(struct iavf_rx_queue *rxq)
 146 {
 147         const unsigned int mask = rxq->nb_rx_desc - 1;
 148         unsigned int i;
 149
 150         if (!rxq->sw_ring || rxq->rxrearm_nb >= rxq->nb_rx_desc)
 151                 return;
 152
 153         /* free all mbufs that are valid in the ring */
 154         if (rxq->rxrearm_nb == 0) {
 155                 for (i = 0; i < rxq->nb_rx_desc; i++) {
 156                         if (rxq->sw_ring[i])
 157                                 rte_pktmbuf_free_seg(rxq->sw_ring[i]);
 158                 }
 159         } else {
 160                 for (i = rxq->rx_tail;
 161                      i != rxq->rxrearm_start;
 162                      i = (i + 1) & mask) {
 163                         if (rxq->sw_ring[i])
 164                                 rte_pktmbuf_free_seg(rxq->sw_ring[i]);
 165                 }
 166         }
 167
 168         rxq->rxrearm_nb = rxq->nb_rx_desc;
 169
 170         /* set all entries to NULL */
 171         memset(rxq->sw_ring, 0, sizeof(rxq->sw_ring[0]) * rxq->nb_rx_desc);
 172 }
 173
 174 static inline void
 175 _iavf_tx_queue_release_mbufs_vec(struct iavf_tx_queue *txq)
 176 {
 177         unsigned i;
 178         const uint16_t max_desc = (uint16_t)(txq->nb_tx_desc - 1);
 179
 180         if (!txq->sw_ring || txq->nb_free == max_desc)
 181                 return;
 182
 183         i = txq->next_dd - txq->rs_thresh + 1;
 184         if (txq->tx_tail < i) {
 185                 for (; i < txq->nb_tx_desc; i++) {
 186                         rte_pktmbuf_free_seg(txq->sw_ring[i].mbuf);
 187                         txq->sw_ring[i].mbuf = NULL;
 188                 }
 189                 i = 0;
 190         }
 191 }
 192
 193 static inline int
 194 iavf_rxq_vec_setup_default(struct iavf_rx_queue *rxq)
 195 {
 196         uintptr_t p;
 197         struct rte_mbuf mb_def = { .buf_addr = 0 }; /* zeroed mbuf */
 198
 199         mb_def.nb_segs = 1;
 200         mb_def.data_off = RTE_PKTMBUF_HEADROOM;
 201         mb_def.port = rxq->port_id;
 202         rte_mbuf_refcnt_set(&mb_def, 1);
 203
 204         /* prevent compiler reordering: rearm_data covers previous fields */
 205         rte_compiler_barrier();
 206         p = (uintptr_t)&mb_def.rearm_data;
 207         rxq->mbuf_initializer = *(uint64_t *)p;
 208         return 0;
 209 }
 210 #endif