drivers/net/nfb/nfb_rx.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2019 Cesnet
   3  * Copyright(c) 2019 Netcope Technologies, a.s. <info@netcope.com>
   4  * All rights reserved.
   5  */
   6
   7 #ifndef _NFB_RX_H_
   8 #define _NFB_RX_H_
   9
  10 #include <nfb/nfb.h>
  11 #include <nfb/ndp.h>
  12
  13 #include <rte_mbuf.h>
  14 #include <rte_ethdev.h>
  15
  16 #define NFB_TIMESTAMP_FLAG (1 << 0)
  17
  18 struct ndp_rx_queue {
  19         struct nfb_device *nfb;      /* nfb dev structure */
  20         struct ndp_queue *queue;     /* rx queue */
  21         uint16_t rx_queue_id;        /* index */
  22         uint8_t in_port;             /* port */
  23         uint8_t flags;               /* setup flags */
  24
  25         struct rte_mempool *mb_pool; /* memory pool to allocate packets */
  26         uint16_t buf_size;           /* mbuf size */
  27
  28         volatile uint64_t rx_pkts;   /* packets read */
  29         volatile uint64_t rx_bytes;  /* bytes read */
  30         volatile uint64_t err_pkts;  /* erroneous packets */
  31 };
  32
  33 /**
  34  * Initialize ndp_rx_queue structure
  35  *
  36  * @param nfb
  37  *   Pointer to nfb device structure.
  38  * @param rx_queue_id
  39  *   RX queue index.
  40  * @param port_id
  41  *   Device [external] port identifier.
  42  * @param mb_pool
  43  *   Memory pool for buffer allocations.
  44  * @param[out] rxq
  45  *   Pointer to ndp_rx_queue output structure
  46  * @return
  47  *   0 on success, a negative errno value otherwise.
  48  */
  49 int
  50 nfb_eth_rx_queue_init(struct nfb_device *nfb,
  51         uint16_t rx_queue_id,
  52         uint16_t port_id,
  53         struct rte_mempool *mb_pool,
  54         struct ndp_rx_queue *rxq);
  55
  56 /**
  57  * DPDK callback to setup a RX queue for use.
  58  *
  59  * @param dev
  60  *   Pointer to Ethernet device structure.
  61  * @param idx
  62  *   RX queue index.
  63  * @param desc
  64  *   Number of descriptors to configure in queue.
  65  * @param socket
  66  *   NUMA socket on which memory must be allocated.
  67  * @param[in] conf
  68  *   Thresholds parameters.
  69  * @param mb_pool
  70  *   Memory pool for buffer allocations.
  71  *
  72  * @return
  73  *   0 on success, a negative errno value otherwise.
  74  */
  75 int
  76 nfb_eth_rx_queue_setup(struct rte_eth_dev *dev,
  77         uint16_t rx_queue_id,
  78         uint16_t nb_rx_desc __rte_unused,
  79         unsigned int socket_id,
  80         const struct rte_eth_rxconf *rx_conf __rte_unused,
  81         struct rte_mempool *mb_pool);
  82
  83 /**
  84  * DPDK callback to release a RX queue.
  85  *
  86  * @param dpdk_rxq
  87  *   Generic RX queue pointer.
  88  */
  89 void
  90 nfb_eth_rx_queue_release(void *q);
  91
  92 /**
  93  * Start traffic on Rx queue.
  94  *
  95  * @param dev
  96  *   Pointer to Ethernet device structure.
  97  * @param txq_id
  98  *   RX queue index.
  99  * @return
 100  *   0 on success, a negative errno value otherwise.
 101  */
 102 int
 103 nfb_eth_rx_queue_start(struct rte_eth_dev *dev, uint16_t rxq_id);
 104
 105 /**
 106  * Stop traffic on Rx queue.
 107  *
 108  * @param dev
 109  *   Pointer to Ethernet device structure.
 110  * @param txq_id
 111  *   RX queue index.
 112  */
 113 int
 114 nfb_eth_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rxq_id);
 115
 116 /**
 117  * DPDK callback for RX.
 118  *
 119  * @param dpdk_rxq
 120  *   Generic pointer to RX queue structure.
 121  * @param[out] bufs
 122  *   Array to store received packets.
 123  * @param nb_pkts
 124  *   Maximum number of packets in array.
 125  *
 126  * @return
 127  *   Number of packets successfully received (<= nb_pkts).
 128  */
 129 static __rte_always_inline uint16_t
 130 nfb_eth_ndp_rx(void *queue,
 131         struct rte_mbuf **bufs,
 132         uint16_t nb_pkts)
 133 {
 134         struct ndp_rx_queue *ndp = queue;
 135         uint8_t timestamping_enabled;
 136         uint16_t packet_size;
 137         uint64_t num_bytes = 0;
 138         uint16_t num_rx;
 139         unsigned int i;
 140
 141         const uint16_t buf_size = ndp->buf_size;
 142
 143         struct rte_mbuf *mbuf;
 144         struct ndp_packet packets[nb_pkts];
 145
 146         struct rte_mbuf *mbufs[nb_pkts];
 147
 148         if (unlikely(ndp->queue == NULL || nb_pkts == 0)) {
 149                 RTE_LOG(ERR, PMD, "RX invalid arguments!\n");
 150                 return 0;
 151         }
 152
 153         timestamping_enabled = ndp->flags & NFB_TIMESTAMP_FLAG;
 154
 155         /* returns either all or nothing */
 156         i = rte_pktmbuf_alloc_bulk(ndp->mb_pool, mbufs, nb_pkts);
 157         if (unlikely(i != 0))
 158                 return 0;
 159
 160         num_rx = ndp_rx_burst_get(ndp->queue, packets, nb_pkts);
 161
 162         if (unlikely(num_rx != nb_pkts)) {
 163                 for (i = num_rx; i < nb_pkts; i++)
 164                         rte_pktmbuf_free(mbufs[i]);
 165         }
 166
 167         nb_pkts = num_rx;
 168
 169         num_rx = 0;
 170         /*
 171          * Reads the given number of packets from NDP queue given
 172          * by queue and copies the packet data into a newly allocated mbuf
 173          * to return.
 174          */
 175         for (i = 0; i < nb_pkts; ++i) {
 176                 mbuf = mbufs[i];
 177
 178                 /* get the space available for data in the mbuf */
 179                 packet_size = packets[i].data_length;
 180
 181                 if (likely(packet_size <= buf_size)) {
 182                         /* NDP packet will fit in one mbuf, go ahead and copy */
 183                         rte_memcpy(rte_pktmbuf_mtod(mbuf, void *),
 184                                 packets[i].data, packet_size);
 185
 186                         mbuf->data_len = (uint16_t)packet_size;
 187
 188                         mbuf->pkt_len = packet_size;
 189                         mbuf->port = ndp->in_port;
 190                         mbuf->ol_flags = 0;
 191
 192                         if (timestamping_enabled) {
 193                                 /* nanoseconds */
 194                                 mbuf->timestamp =
 195                                         rte_le_to_cpu_32(*((uint32_t *)
 196                                         (packets[i].header + 4)));
 197                                 mbuf->timestamp <<= 32;
 198                                 /* seconds */
 199                                 mbuf->timestamp |=
 200                                         rte_le_to_cpu_32(*((uint32_t *)
 201                                         (packets[i].header + 8)));
 202                                 mbuf->ol_flags |= PKT_RX_TIMESTAMP;
 203                         }
 204
 205                         bufs[num_rx++] = mbuf;
 206                         num_bytes += packet_size;
 207                 } else {
 208                         /*
 209                          * NDP packet will not fit in one mbuf,
 210                          * scattered mode is not enabled, drop packet
 211                          */
 212                         rte_pktmbuf_free(mbuf);
 213                 }
 214         }
 215
 216         ndp_rx_burst_put(ndp->queue);
 217
 218         ndp->rx_pkts += num_rx;
 219         ndp->rx_bytes += num_bytes;
 220         return num_rx;
 221 }
 222
 223 #endif /* _NFB_RX_H_ */