From 7d087a0a8b8e53278302601cd4b22e50ef0d5ee2 Mon Sep 17 00:00:00 2001 From: Harry van Haaren Date: Wed, 9 Oct 2019 16:20:06 +0100 Subject: [PATCH] net/i40e: support flow director on AVX Rx This commit adds FDIR ID support to the AVX2 based receive path routine. Support for both 16B and 32B descriptors is implemented. Signed-off-by: Harry van Haaren Acked-by: Qi Zhang Tested-by: Mesut Ali Ergin --- drivers/net/i40e/i40e_rxtx_vec_avx2.c | 193 +++++++++++++++++++++++++- 1 file changed, 189 insertions(+), 4 deletions(-) diff --git a/drivers/net/i40e/i40e_rxtx_vec_avx2.c b/drivers/net/i40e/i40e_rxtx_vec_avx2.c index 6f3278960f..b9f1a240c2 100644 --- a/drivers/net/i40e/i40e_rxtx_vec_avx2.c +++ b/drivers/net/i40e/i40e_rxtx_vec_avx2.c @@ -137,9 +137,90 @@ i40e_rxq_rearm(struct i40e_rx_queue *rxq) I40E_PCI_REG_WRITE(rxq->qrx_tail, rx_id); } +#ifndef RTE_LIBRTE_I40E_16BYTE_RX_DESC +/* Handles 32B descriptor FDIR ID processing: + * rxdp: receive descriptor ring, required to load 2nd 16B half of each desc + * rx_pkts: required to store metadata back to mbufs + * pkt_idx: offset into the burst, increments in vector widths + * desc_idx: required to select the correct shift at compile time + */ +static inline __m256i +desc_fdir_processing_32b(volatile union i40e_rx_desc *rxdp, + struct rte_mbuf **rx_pkts, + const uint32_t pkt_idx, + const uint32_t desc_idx) +{ + /* 32B desc path: load rxdp.wb.qword2 for EXT_STATUS and FLEXBH_STAT */ + __m128i *rxdp_desc_0 = (void *)(&rxdp[desc_idx + 0].wb.qword2); + __m128i *rxdp_desc_1 = (void *)(&rxdp[desc_idx + 1].wb.qword2); + const __m128i desc_qw2_0 = _mm_load_si128(rxdp_desc_0); + const __m128i desc_qw2_1 = _mm_load_si128(rxdp_desc_1); + + /* Mask for FLEXBH_STAT, and the FDIR_ID value to compare against. The + * remaining data is set to all 1's to pass through data. + */ + const __m256i flexbh_mask = _mm256_set_epi32(-1, -1, -1, 3 << 4, + -1, -1, -1, 3 << 4); + const __m256i flexbh_id = _mm256_set_epi32(-1, -1, -1, 1 << 4, + -1, -1, -1, 1 << 4); + + /* Load descriptor, check for FLEXBH bits, generate a mask for both + * packets in the register. + */ + __m256i desc_qw2_0_1 = + _mm256_inserti128_si256(_mm256_castsi128_si256(desc_qw2_0), + desc_qw2_1, 1); + __m256i desc_tmp_msk = _mm256_and_si256(flexbh_mask, desc_qw2_0_1); + __m256i fdir_mask = _mm256_cmpeq_epi32(flexbh_id, desc_tmp_msk); + __m256i fdir_data = _mm256_alignr_epi8(desc_qw2_0_1, desc_qw2_0_1, 12); + __m256i desc_fdir_data = _mm256_and_si256(fdir_mask, fdir_data); + + /* Write data out to the mbuf. There is no store to this area of the + * mbuf today, so we cannot combine it with another store. + */ + const uint32_t idx_0 = pkt_idx + desc_idx; + const uint32_t idx_1 = pkt_idx + desc_idx + 1; + rx_pkts[idx_0]->hash.fdir.hi = _mm256_extract_epi32(desc_fdir_data, 0); + rx_pkts[idx_1]->hash.fdir.hi = _mm256_extract_epi32(desc_fdir_data, 4); + + /* Create mbuf flags as required for mbuf_flags layout + * (That's high lane [1,3,5,7, 0,2,4,6] as u32 lanes). + * Approach: + * - Mask away bits not required from the fdir_mask + * - Leave the PKT_FDIR_ID bit (1 << 13) + * - Position that bit correctly based on packet number + * - OR in the resulting bit to mbuf_flags + */ + RTE_BUILD_BUG_ON(PKT_RX_FDIR_ID != (1 << 13)); + __m256i mbuf_flag_mask = _mm256_set_epi32(0, 0, 0, 1 << 13, + 0, 0, 0, 1 << 13); + __m256i desc_flag_bit = _mm256_and_si256(mbuf_flag_mask, fdir_mask); + + /* For static-inline function, this will be stripped out + * as the desc_idx is a hard-coded constant. + */ + switch (desc_idx) { + case 0: + return _mm256_alignr_epi8(desc_flag_bit, desc_flag_bit, 4); + case 2: + return _mm256_alignr_epi8(desc_flag_bit, desc_flag_bit, 8); + case 4: + return _mm256_alignr_epi8(desc_flag_bit, desc_flag_bit, 12); + case 6: + return desc_flag_bit; + default: + break; + } + + /* NOT REACHED, see above switch returns */ + return _mm256_setzero_si256(); +} +#endif /* RTE_LIBRTE_I40E_16BYTE_RX_DESC */ + #define PKTLEN_SHIFT 10 -static inline uint16_t +/* Force inline as some compilers will not inline by default. */ +static __rte_always_inline uint16_t _recv_raw_pkts_vec_avx2(struct i40e_rx_queue *rxq, struct rte_mbuf **rx_pkts, uint16_t nb_pkts, uint8_t *split_packet) { @@ -419,8 +500,10 @@ _recv_raw_pkts_vec_avx2(struct i40e_rx_queue *rxq, struct rte_mbuf **rx_pkts, /* set vlan and rss flags */ const __m256i vlan_flags = _mm256_shuffle_epi8( vlan_flags_shuf, flag_bits); - const __m256i rss_flags = _mm256_shuffle_epi8( - rss_flags_shuf, _mm256_srli_epi32(flag_bits, 11)); + const __m256i rss_fdir_bits = _mm256_srli_epi32(flag_bits, 11); + const __m256i rss_flags = _mm256_shuffle_epi8(rss_flags_shuf, + rss_fdir_bits); + /* * l3_l4_error flags, shuffle, then shift to correct adjustment * of flags in flags_shuf, and finally mask out extra bits @@ -431,8 +514,110 @@ _recv_raw_pkts_vec_avx2(struct i40e_rx_queue *rxq, struct rte_mbuf **rx_pkts, l3_l4_flags = _mm256_and_si256(l3_l4_flags, cksum_mask); /* merge flags */ - const __m256i mbuf_flags = _mm256_or_si256(l3_l4_flags, + __m256i mbuf_flags = _mm256_or_si256(l3_l4_flags, _mm256_or_si256(rss_flags, vlan_flags)); + + /* 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. + */ + + /* 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(); + const uint32_t fdir_blend_mask = (1 << 3) | (1 << 7); + __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 */ + /* * At this point, we have the 8 sets of flags in the low 16-bits * of each 32-bit value in vlan0.