ceph/src/seastar/dpdk/drivers/net/sfc/sfc_tso.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  *
   3  * Copyright (c) 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 #ifndef _SFC_TSO_H
  11 #define _SFC_TSO_H
  12
  13 #ifdef __cplusplus
  14 extern "C" {
  15 #endif
  16
  17 /** Standard TSO header length */
  18 #define SFC_TSOH_STD_LEN        256
  19
  20 /** The number of TSO option descriptors that precede the packet descriptors */
  21 #define SFC_EF10_TSO_OPT_DESCS_NUM      2
  22
  23 /**
  24  * The number of DMA descriptors for TSO header that may or may not precede the
  25  * packet's payload descriptors
  26  */
  27 #define SFC_EF10_TSO_HDR_DESCS_NUM      1
  28
  29 static inline uint16_t
  30 sfc_tso_ip4_get_ipid(const uint8_t *pkt_hdrp, size_t ip_hdr_off)
  31 {
  32         const struct ipv4_hdr *ip_hdrp;
  33         uint16_t ipid;
  34
  35         ip_hdrp = (const struct ipv4_hdr *)(pkt_hdrp + ip_hdr_off);
  36         rte_memcpy(&ipid, &ip_hdrp->packet_id, sizeof(ipid));
  37
  38         return rte_be_to_cpu_16(ipid);
  39 }
  40
  41 unsigned int sfc_tso_prepare_header(uint8_t *tsoh, size_t header_len,
  42                                     struct rte_mbuf **in_seg, size_t *in_off);
  43
  44 #ifdef __cplusplus
  45 }
  46 #endif
  47
  48 #endif  /* _SFC_TSO_H */