- /* At this point, there shouldn't be any remained packets. */
- assert(rxq->rq_pi == rxq->cq_ci);
- /*
- * A. load first Qword (8bytes) in one loop.
- * B. copy 4 mbuf pointers from elts ring to returing pkts.
- * C. load remained CQE data and extract necessary fields.
- * Final 16bytes cqes[] extracted from original 64bytes CQE has the
- * following structure:
- * struct {
- * uint8_t pkt_info;
- * uint8_t flow_tag[3];
- * uint16_t byte_cnt;
- * uint8_t rsvd4;
- * uint8_t op_own;
- * uint16_t hdr_type_etc;
- * uint16_t vlan_info;
- * uint32_t rx_has_res;
- * } c;
- * D. fill in mbuf.
- * E. get valid CQEs.
- * F. find compressed CQE.
- */
- for (pos = 0;
- pos < pkts_n;
- pos += MLX5_VPMD_DESCS_PER_LOOP) {
- __m128i cqes[MLX5_VPMD_DESCS_PER_LOOP];
- __m128i cqe_tmp1, cqe_tmp2;
- __m128i pkt_mb0, pkt_mb1, pkt_mb2, pkt_mb3;
- __m128i op_own, op_own_tmp1, op_own_tmp2;
- __m128i opcode, owner_mask, invalid_mask;
- __m128i comp_mask;
- __m128i mask;
-#ifdef MLX5_PMD_SOFT_COUNTERS
- __m128i byte_cnt;
-#endif
- __m128i mbp1, mbp2;
- __m128i p = _mm_set_epi16(0, 0, 0, 0, 3, 2, 1, 0);
- unsigned int p1, p2, p3;
-
- /* Prefetch next 4 CQEs. */
- if (pkts_n - pos >= 2 * MLX5_VPMD_DESCS_PER_LOOP) {
- rte_prefetch0(&cq[pos + MLX5_VPMD_DESCS_PER_LOOP]);
- rte_prefetch0(&cq[pos + MLX5_VPMD_DESCS_PER_LOOP + 1]);
- rte_prefetch0(&cq[pos + MLX5_VPMD_DESCS_PER_LOOP + 2]);
- rte_prefetch0(&cq[pos + MLX5_VPMD_DESCS_PER_LOOP + 3]);
- }
- /* A.0 do not cross the end of CQ. */
- mask = _mm_set_epi64x(0, (pkts_n - pos) * sizeof(uint16_t) * 8);
- mask = _mm_sll_epi64(ones, mask);
- p = _mm_andnot_si128(mask, p);
- /* A.1 load cqes. */
- p3 = _mm_extract_epi16(p, 3);
- cqes[3] = _mm_loadl_epi64((__m128i *)
- &cq[pos + p3].sop_drop_qpn);
- rte_compiler_barrier();
- p2 = _mm_extract_epi16(p, 2);
- cqes[2] = _mm_loadl_epi64((__m128i *)
- &cq[pos + p2].sop_drop_qpn);
- rte_compiler_barrier();
- /* B.1 load mbuf pointers. */
- mbp1 = _mm_loadu_si128((__m128i *)&elts[pos]);
- mbp2 = _mm_loadu_si128((__m128i *)&elts[pos + 2]);
- /* A.1 load a block having op_own. */
- p1 = _mm_extract_epi16(p, 1);
- cqes[1] = _mm_loadl_epi64((__m128i *)
- &cq[pos + p1].sop_drop_qpn);
- rte_compiler_barrier();
- cqes[0] = _mm_loadl_epi64((__m128i *)
- &cq[pos].sop_drop_qpn);
- /* B.2 copy mbuf pointers. */
- _mm_storeu_si128((__m128i *)&pkts[pos], mbp1);
- _mm_storeu_si128((__m128i *)&pkts[pos + 2], mbp2);
- rte_compiler_barrier();
- /* C.1 load remained CQE data and extract necessary fields. */
- cqe_tmp2 = _mm_load_si128((__m128i *)&cq[pos + p3]);
- cqe_tmp1 = _mm_load_si128((__m128i *)&cq[pos + p2]);
- cqes[3] = _mm_blendv_epi8(cqes[3], cqe_tmp2, blend_mask);
- cqes[2] = _mm_blendv_epi8(cqes[2], cqe_tmp1, blend_mask);
- cqe_tmp2 = _mm_loadu_si128((__m128i *)&cq[pos + p3].rsvd1[3]);
- cqe_tmp1 = _mm_loadu_si128((__m128i *)&cq[pos + p2].rsvd1[3]);
- cqes[3] = _mm_blend_epi16(cqes[3], cqe_tmp2, 0x30);
- cqes[2] = _mm_blend_epi16(cqes[2], cqe_tmp1, 0x30);
- cqe_tmp2 = _mm_loadl_epi64((__m128i *)&cq[pos + p3].rsvd2[10]);
- cqe_tmp1 = _mm_loadl_epi64((__m128i *)&cq[pos + p2].rsvd2[10]);
- cqes[3] = _mm_blend_epi16(cqes[3], cqe_tmp2, 0x04);
- cqes[2] = _mm_blend_epi16(cqes[2], cqe_tmp1, 0x04);
- /* C.2 generate final structure for mbuf with swapping bytes. */
- pkt_mb3 = _mm_shuffle_epi8(cqes[3], shuf_mask);
- pkt_mb2 = _mm_shuffle_epi8(cqes[2], shuf_mask);
- /* C.3 adjust CRC length. */
- pkt_mb3 = _mm_sub_epi16(pkt_mb3, crc_adj);
- pkt_mb2 = _mm_sub_epi16(pkt_mb2, crc_adj);
- /* C.4 adjust flow mark. */
- pkt_mb3 = _mm_add_epi32(pkt_mb3, flow_mark_adj);
- pkt_mb2 = _mm_add_epi32(pkt_mb2, flow_mark_adj);
- /* D.1 fill in mbuf - rx_descriptor_fields1. */
- _mm_storeu_si128((void *)&pkts[pos + 3]->pkt_len, pkt_mb3);
- _mm_storeu_si128((void *)&pkts[pos + 2]->pkt_len, pkt_mb2);
- /* E.1 extract op_own field. */
- op_own_tmp2 = _mm_unpacklo_epi32(cqes[2], cqes[3]);
- /* C.1 load remained CQE data and extract necessary fields. */
- cqe_tmp2 = _mm_load_si128((__m128i *)&cq[pos + p1]);
- cqe_tmp1 = _mm_load_si128((__m128i *)&cq[pos]);
- cqes[1] = _mm_blendv_epi8(cqes[1], cqe_tmp2, blend_mask);
- cqes[0] = _mm_blendv_epi8(cqes[0], cqe_tmp1, blend_mask);
- cqe_tmp2 = _mm_loadu_si128((__m128i *)&cq[pos + p1].rsvd1[3]);
- cqe_tmp1 = _mm_loadu_si128((__m128i *)&cq[pos].rsvd1[3]);
- cqes[1] = _mm_blend_epi16(cqes[1], cqe_tmp2, 0x30);
- cqes[0] = _mm_blend_epi16(cqes[0], cqe_tmp1, 0x30);
- cqe_tmp2 = _mm_loadl_epi64((__m128i *)&cq[pos + p1].rsvd2[10]);
- cqe_tmp1 = _mm_loadl_epi64((__m128i *)&cq[pos].rsvd2[10]);
- cqes[1] = _mm_blend_epi16(cqes[1], cqe_tmp2, 0x04);
- cqes[0] = _mm_blend_epi16(cqes[0], cqe_tmp1, 0x04);
- /* C.2 generate final structure for mbuf with swapping bytes. */
- pkt_mb1 = _mm_shuffle_epi8(cqes[1], shuf_mask);
- pkt_mb0 = _mm_shuffle_epi8(cqes[0], shuf_mask);
- /* C.3 adjust CRC length. */
- pkt_mb1 = _mm_sub_epi16(pkt_mb1, crc_adj);
- pkt_mb0 = _mm_sub_epi16(pkt_mb0, crc_adj);
- /* C.4 adjust flow mark. */
- pkt_mb1 = _mm_add_epi32(pkt_mb1, flow_mark_adj);
- pkt_mb0 = _mm_add_epi32(pkt_mb0, flow_mark_adj);
- /* E.1 extract op_own byte. */
- op_own_tmp1 = _mm_unpacklo_epi32(cqes[0], cqes[1]);
- op_own = _mm_unpackhi_epi64(op_own_tmp1, op_own_tmp2);
- /* D.1 fill in mbuf - rx_descriptor_fields1. */
- _mm_storeu_si128((void *)&pkts[pos + 1]->pkt_len, pkt_mb1);
- _mm_storeu_si128((void *)&pkts[pos]->pkt_len, pkt_mb0);
- /* E.2 flip owner bit to mark CQEs from last round. */
- owner_mask = _mm_and_si128(op_own, owner_check);
- if (ownership)
- owner_mask = _mm_xor_si128(owner_mask, owner_check);
- owner_mask = _mm_cmpeq_epi32(owner_mask, owner_check);
- owner_mask = _mm_packs_epi32(owner_mask, zero);
- /* E.3 get mask for invalidated CQEs. */
- opcode = _mm_and_si128(op_own, opcode_check);
- invalid_mask = _mm_cmpeq_epi32(opcode_check, opcode);
- invalid_mask = _mm_packs_epi32(invalid_mask, zero);
- /* E.4 mask out beyond boundary. */
- invalid_mask = _mm_or_si128(invalid_mask, mask);
- /* E.5 merge invalid_mask with invalid owner. */
- invalid_mask = _mm_or_si128(invalid_mask, owner_mask);
- /* F.1 find compressed CQE format. */
- comp_mask = _mm_and_si128(op_own, format_check);
- comp_mask = _mm_cmpeq_epi32(comp_mask, format_check);
- comp_mask = _mm_packs_epi32(comp_mask, zero);
- /* F.2 mask out invalid entries. */
- comp_mask = _mm_andnot_si128(invalid_mask, comp_mask);
- comp_idx = _mm_cvtsi128_si64(comp_mask);
- /* F.3 get the first compressed CQE. */
- comp_idx = comp_idx ?
- __builtin_ctzll(comp_idx) /
- (sizeof(uint16_t) * 8) :
- MLX5_VPMD_DESCS_PER_LOOP;
- /* E.6 mask out entries after the compressed CQE. */
- mask = _mm_set_epi64x(0, comp_idx * sizeof(uint16_t) * 8);
- mask = _mm_sll_epi64(ones, mask);
- invalid_mask = _mm_or_si128(invalid_mask, mask);
- /* E.7 count non-compressed valid CQEs. */
- n = _mm_cvtsi128_si64(invalid_mask);
- n = n ? __builtin_ctzll(n) / (sizeof(uint16_t) * 8) :
- MLX5_VPMD_DESCS_PER_LOOP;
- nocmp_n += n;
- /* D.2 get the final invalid mask. */
- mask = _mm_set_epi64x(0, n * sizeof(uint16_t) * 8);
- mask = _mm_sll_epi64(ones, mask);
- invalid_mask = _mm_or_si128(invalid_mask, mask);
- /* D.3 check error in opcode. */
- opcode = _mm_cmpeq_epi32(resp_err_check, opcode);
- opcode = _mm_packs_epi32(opcode, zero);
- opcode = _mm_andnot_si128(invalid_mask, opcode);
- /* D.4 mark if any error is set */
- rxq->pending_err |= !!_mm_cvtsi128_si64(opcode);
- /* D.5 fill in mbuf - rearm_data and packet_type. */
- rxq_cq_to_ptype_oflags_v(rxq, cqes, opcode, &pkts[pos]);
-#ifdef MLX5_PMD_SOFT_COUNTERS
- /* Add up received bytes count. */
- byte_cnt = _mm_shuffle_epi8(op_own, len_shuf_mask);
- byte_cnt = _mm_andnot_si128(invalid_mask, byte_cnt);
- byte_cnt = _mm_hadd_epi16(byte_cnt, zero);
- rcvd_byte += _mm_cvtsi128_si64(_mm_hadd_epi16(byte_cnt, zero));
-#endif
- /*
- * Break the loop unless more valid CQE is expected, or if
- * there's a compressed CQE.
- */
- if (n != MLX5_VPMD_DESCS_PER_LOOP)
- break;