* calc_tx_flits - calculate the number of flits for a packet Tx WR * @m: the packet * @adap: adapter structure pointer * * Returns the number of flits needed for a Tx WR for the given Ethernet * packet, including the needed WR and CPL headers. */
| 490 | * packet, including the needed WR and CPL headers. |
| 491 | */ |
| 492 | static inline unsigned int calc_tx_flits(const struct rte_mbuf *m, |
| 493 | struct adapter *adap) |
| 494 | { |
| 495 | size_t wr_size = is_pf4(adap) ? sizeof(struct fw_eth_tx_pkt_wr) : |
| 496 | sizeof(struct fw_eth_tx_pkt_vm_wr); |
| 497 | unsigned int flits; |
| 498 | int hdrlen; |
| 499 | |
| 500 | /* |
| 501 | * If the mbuf is small enough, we can pump it out as a work request |
| 502 | * with only immediate data. In that case we just have to have the |
| 503 | * TX Packet header plus the mbuf data in the Work Request. |
| 504 | */ |
| 505 | |
| 506 | hdrlen = is_eth_imm(m); |
| 507 | if (hdrlen) |
| 508 | return DIV_ROUND_UP(m->pkt_len + hdrlen, sizeof(__be64)); |
| 509 | |
| 510 | /* |
| 511 | * Otherwise, we're going to have to construct a Scatter gather list |
| 512 | * of the mbuf body and fragments. We also include the flits necessary |
| 513 | * for the TX Packet Work Request and CPL. We always have a firmware |
| 514 | * Write Header (incorporated as part of the cpl_tx_pkt_lso and |
| 515 | * cpl_tx_pkt structures), followed by either a TX Packet Write CPL |
| 516 | * message or, if we're doing a Large Send Offload, an LSO CPL message |
| 517 | * with an embedded TX Packet Write CPL message. |
| 518 | */ |
| 519 | flits = sgl_len(m->nb_segs); |
| 520 | if (m->tso_segsz) |
| 521 | flits += (wr_size + sizeof(struct cpl_tx_pkt_lso_core) + |
| 522 | sizeof(struct cpl_tx_pkt_core)) / sizeof(__be64); |
| 523 | else |
| 524 | flits += (wr_size + |
| 525 | sizeof(struct cpl_tx_pkt_core)) / sizeof(__be64); |
| 526 | return flits; |
| 527 | } |
| 528 | |
| 529 | /** |
| 530 | * write_sgl - populate a scatter/gather list for a packet |
no test coverage detected