+
+ /* If the rxq has FDIR enabled, read and process the FDIR info
+ * from the descriptor. This can cause more loads/stores, so is
+ * not always performed. Branch over the code when not enabled.
+ */
+ if (rxq->fdir_enabled) {
+#ifdef RTE_LIBRTE_I40E_16BYTE_RX_DESC
+ /* 16B descriptor code path:
+ * RSS and FDIR ID use the same offset in the desc, so
+ * only one can be present at a time. The code below
+ * identifies an FDIR ID match, and zeros the RSS value
+ * in the mbuf on FDIR match to keep mbuf data clean.
+ */
+#define FDIR_BLEND_MASK ((1 << 3) | (1 << 7))
+
+ /* Flags:
+ * - Take flags, shift bits to null out
+ * - CMPEQ with known FDIR ID, to get 0xFFFF or 0 mask
+ * - Strip bits from mask, leaving 0 or 1 for FDIR ID
+ * - Merge with mbuf_flags
+ */
+ /* FLM = 1, FLTSTAT = 0b01, (FLM | FLTSTAT) == 3.
+ * Shift left by 28 to avoid having to mask.
+ */
+ const __m256i fdir = _mm256_slli_epi32(rss_fdir_bits, 28);
+ const __m256i fdir_id = _mm256_set1_epi32(3 << 28);
+
+ /* As above, the fdir_mask to packet mapping is this:
+ * order (hi->lo): [1, 3, 5, 7, 0, 2, 4, 6]
+ * Then OR FDIR flags to mbuf_flags on FDIR ID hit.
+ */
+ RTE_BUILD_BUG_ON(PKT_RX_FDIR_ID != (1 << 13));
+ const __m256i pkt_fdir_bit = _mm256_set1_epi32(1 << 13);
+ const __m256i fdir_mask = _mm256_cmpeq_epi32(fdir, fdir_id);
+ __m256i fdir_bits = _mm256_and_si256(fdir_mask, pkt_fdir_bit);
+ mbuf_flags = _mm256_or_si256(mbuf_flags, fdir_bits);
+
+ /* Based on FDIR_MASK, clear the RSS or FDIR value.
+ * The FDIR ID value is masked to zero if not a hit,
+ * otherwise the mb0_1 register RSS field is zeroed.
+ */
+ const __m256i fdir_zero_mask = _mm256_setzero_si256();
+ __m256i tmp0_1 = _mm256_blend_epi32(fdir_zero_mask,
+ fdir_mask, FDIR_BLEND_MASK);
+ __m256i fdir_mb0_1 = _mm256_and_si256(mb0_1, fdir_mask);
+ mb0_1 = _mm256_andnot_si256(tmp0_1, mb0_1);
+
+ /* Write to mbuf: no stores to combine with, so just a
+ * scalar store to push data here.
+ */
+ rx_pkts[i + 0]->hash.fdir.hi = _mm256_extract_epi32(fdir_mb0_1, 3);
+ rx_pkts[i + 1]->hash.fdir.hi = _mm256_extract_epi32(fdir_mb0_1, 7);
+
+ /* Same as above, only shift the fdir_mask to align
+ * the packet FDIR mask with the FDIR_ID desc lane.
+ */
+ __m256i tmp2_3 = _mm256_alignr_epi8(fdir_mask, fdir_mask, 12);
+ __m256i fdir_mb2_3 = _mm256_and_si256(mb2_3, tmp2_3);
+ tmp2_3 = _mm256_blend_epi32(fdir_zero_mask, tmp2_3,
+ FDIR_BLEND_MASK);
+ mb2_3 = _mm256_andnot_si256(tmp2_3, mb2_3);
+ rx_pkts[i + 2]->hash.fdir.hi = _mm256_extract_epi32(fdir_mb2_3, 3);
+ rx_pkts[i + 3]->hash.fdir.hi = _mm256_extract_epi32(fdir_mb2_3, 7);
+
+ __m256i tmp4_5 = _mm256_alignr_epi8(fdir_mask, fdir_mask, 8);
+ __m256i fdir_mb4_5 = _mm256_and_si256(mb4_5, tmp4_5);
+ tmp4_5 = _mm256_blend_epi32(fdir_zero_mask, tmp4_5,
+ FDIR_BLEND_MASK);
+ mb4_5 = _mm256_andnot_si256(tmp4_5, mb4_5);
+ rx_pkts[i + 4]->hash.fdir.hi = _mm256_extract_epi32(fdir_mb4_5, 3);
+ rx_pkts[i + 5]->hash.fdir.hi = _mm256_extract_epi32(fdir_mb4_5, 7);
+
+ __m256i tmp6_7 = _mm256_alignr_epi8(fdir_mask, fdir_mask, 4);
+ __m256i fdir_mb6_7 = _mm256_and_si256(mb6_7, tmp6_7);
+ tmp6_7 = _mm256_blend_epi32(fdir_zero_mask, tmp6_7,
+ FDIR_BLEND_MASK);
+ mb6_7 = _mm256_andnot_si256(tmp6_7, mb6_7);
+ rx_pkts[i + 6]->hash.fdir.hi = _mm256_extract_epi32(fdir_mb6_7, 3);
+ rx_pkts[i + 7]->hash.fdir.hi = _mm256_extract_epi32(fdir_mb6_7, 7);
+
+ /* End of 16B descriptor handling */
+#else
+ /* 32B descriptor FDIR ID mark handling. Returns bits
+ * to be OR-ed into the mbuf olflags.
+ */
+ __m256i fdir_add_flags;
+ fdir_add_flags = desc_fdir_processing_32b(rxdp, rx_pkts, i, 0);
+ mbuf_flags = _mm256_or_si256(mbuf_flags, fdir_add_flags);
+
+ fdir_add_flags = desc_fdir_processing_32b(rxdp, rx_pkts, i, 2);
+ mbuf_flags = _mm256_or_si256(mbuf_flags, fdir_add_flags);
+
+ fdir_add_flags = desc_fdir_processing_32b(rxdp, rx_pkts, i, 4);
+ mbuf_flags = _mm256_or_si256(mbuf_flags, fdir_add_flags);
+
+ fdir_add_flags = desc_fdir_processing_32b(rxdp, rx_pkts, i, 6);
+ mbuf_flags = _mm256_or_si256(mbuf_flags, fdir_add_flags);
+ /* End 32B desc handling */
+#endif /* RTE_LIBRTE_I40E_16BYTE_RX_DESC */
+
+ } /* if() on FDIR enabled */
+