From: Wenzhuo Lu Date: Thu, 29 Oct 2020 01:24:04 +0000 (+0800) Subject: net/iavf: enable AVX512 for Tx X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=9ab9514c150e;p=dpdk.git net/iavf: enable AVX512 for Tx To enhance the per-core performance, this patch adds some AVX512 instructions to the data path to handle the Tx descriptors. Signed-off-by: Wenzhuo Lu Signed-off-by: Bruce Richardson Signed-off-by: Leyi Rong Acked-by: Qi Zhang --- diff --git a/doc/guides/rel_notes/release_20_11.rst b/doc/guides/rel_notes/release_20_11.rst index 30e53c8eaa..5fe3dd005e 100644 --- a/doc/guides/rel_notes/release_20_11.rst +++ b/doc/guides/rel_notes/release_20_11.rst @@ -171,7 +171,7 @@ New Features * **Updated Intel iavf driver.** - * Added support of AVX512 instructions in Rx path. + * Added support of AVX512 instructions in Rx and Tx path. * **Updated Intel ice driver.** diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c index d12a2363f5..9eea8bf90c 100644 --- a/drivers/net/iavf/iavf_ethdev.c +++ b/drivers/net/iavf/iavf_ethdev.c @@ -749,7 +749,8 @@ iavf_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info) DEV_TX_OFFLOAD_GRE_TNL_TSO | DEV_TX_OFFLOAD_IPIP_TNL_TSO | DEV_TX_OFFLOAD_GENEVE_TNL_TSO | - DEV_TX_OFFLOAD_MULTI_SEGS; + DEV_TX_OFFLOAD_MULTI_SEGS | + DEV_TX_OFFLOAD_MBUF_FAST_FREE; dev_info->default_rxconf = (struct rte_eth_rxconf) { .rx_free_thresh = IAVF_DEFAULT_RX_FREE_THRESH, diff --git a/drivers/net/iavf/iavf_rxtx.c b/drivers/net/iavf/iavf_rxtx.c index 0f38afbaa7..160d81b761 100644 --- a/drivers/net/iavf/iavf_rxtx.c +++ b/drivers/net/iavf/iavf_rxtx.c @@ -2229,20 +2229,22 @@ iavf_set_tx_function(struct rte_eth_dev *dev) struct iavf_tx_queue *txq; int i; bool use_avx2 = false; +#ifdef CC_AVX512_SUPPORT + bool use_avx512 = false; +#endif if (!iavf_tx_vec_dev_check(dev) && rte_vect_get_max_simd_bitwidth() >= RTE_VECT_SIMD_128) { - for (i = 0; i < dev->data->nb_tx_queues; i++) { - txq = dev->data->tx_queues[i]; - if (!txq) - continue; - iavf_txq_vec_setup(txq); - } - if ((rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2) == 1 || rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512F) == 1) && rte_vect_get_max_simd_bitwidth() >= RTE_VECT_SIMD_256) use_avx2 = true; +#ifdef CC_AVX512_SUPPORT + if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512F) == 1 && + rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512BW) == 1 && + rte_vect_get_max_simd_bitwidth() >= RTE_VECT_SIMD_512) + use_avx512 = true; +#endif PMD_DRV_LOG(DEBUG, "Using %sVector Tx (port %d).", use_avx2 ? "avx2 " : "", @@ -2250,8 +2252,26 @@ iavf_set_tx_function(struct rte_eth_dev *dev) dev->tx_pkt_burst = use_avx2 ? iavf_xmit_pkts_vec_avx2 : iavf_xmit_pkts_vec; +#ifdef CC_AVX512_SUPPORT + if (use_avx512) + dev->tx_pkt_burst = iavf_xmit_pkts_vec_avx512; +#endif dev->tx_pkt_prepare = NULL; + for (i = 0; i < dev->data->nb_tx_queues; i++) { + txq = dev->data->tx_queues[i]; + if (!txq) + continue; +#ifdef CC_AVX512_SUPPORT + if (use_avx512) + iavf_txq_vec_setup_avx512(txq); + else + iavf_txq_vec_setup(txq); +#else + iavf_txq_vec_setup(txq); +#endif + } + return; } #endif diff --git a/drivers/net/iavf/iavf_rxtx.h b/drivers/net/iavf/iavf_rxtx.h index 03b095d742..b22ccc42eb 100644 --- a/drivers/net/iavf/iavf_rxtx.h +++ b/drivers/net/iavf/iavf_rxtx.h @@ -122,6 +122,10 @@ struct iavf_tx_entry { uint16_t last_id; }; +struct iavf_tx_vec_entry { + struct rte_mbuf *mbuf; +}; + /* Structure associated with each TX queue. */ struct iavf_tx_queue { const struct rte_memzone *mz; /* memzone for Tx ring */ @@ -449,6 +453,9 @@ uint16_t iavf_recv_scattered_pkts_vec_avx512(void *rx_queue, uint16_t iavf_recv_scattered_pkts_vec_avx512_flex_rxd(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts); +uint16_t iavf_xmit_pkts_vec_avx512(void *tx_queue, struct rte_mbuf **tx_pkts, + uint16_t nb_pkts); +int iavf_txq_vec_setup_avx512(struct iavf_tx_queue *txq); const uint32_t *iavf_get_default_ptype_table(void); diff --git a/drivers/net/iavf/iavf_rxtx_vec_avx512.c b/drivers/net/iavf/iavf_rxtx_vec_avx512.c index df0f43bac1..86807346be 100644 --- a/drivers/net/iavf/iavf_rxtx_vec_avx512.c +++ b/drivers/net/iavf/iavf_rxtx_vec_avx512.c @@ -1396,3 +1396,307 @@ iavf_recv_scattered_pkts_vec_avx512_flex_rxd(void *rx_queue, return retval + iavf_recv_scattered_burst_vec_avx512_flex_rxd(rx_queue, rx_pkts + retval, nb_pkts); } + +static __rte_always_inline int +iavf_tx_free_bufs_avx512(struct iavf_tx_queue *txq) +{ + struct iavf_tx_vec_entry *txep; + uint32_t n; + uint32_t i; + int nb_free = 0; + struct rte_mbuf *m, *free[IAVF_VPMD_TX_MAX_FREE_BUF]; + + /* check DD bits on threshold descriptor */ + if ((txq->tx_ring[txq->next_dd].cmd_type_offset_bsz & + rte_cpu_to_le_64(IAVF_TXD_QW1_DTYPE_MASK)) != + rte_cpu_to_le_64(IAVF_TX_DESC_DTYPE_DESC_DONE)) + return 0; + + n = txq->rs_thresh; + + /* first buffer to free from S/W ring is at index + * tx_next_dd - (tx_rs_thresh-1) + */ + txep = (void *)txq->sw_ring; + txep += txq->next_dd - (n - 1); + + if (txq->offloads & DEV_TX_OFFLOAD_MBUF_FAST_FREE && (n & 31) == 0) { + struct rte_mempool *mp = txep[0].mbuf->pool; + struct rte_mempool_cache *cache = rte_mempool_default_cache(mp, + rte_lcore_id()); + void **cache_objs = &cache->objs[cache->len]; + + if (n > RTE_MEMPOOL_CACHE_MAX_SIZE) { + rte_mempool_ops_enqueue_bulk(mp, (void *)txep, n); + goto done; + } + + /* The cache follows the following algorithm + * 1. Add the objects to the cache + * 2. Anything greater than the cache min value (if it crosses the + * cache flush threshold) is flushed to the ring. + */ + /* Add elements back into the cache */ + uint32_t copied = 0; + /* n is multiple of 32 */ + while (copied < n) { + const __m512i a = _mm512_loadu_si512(&txep[copied]); + const __m512i b = _mm512_loadu_si512(&txep[copied + 8]); + const __m512i c = _mm512_loadu_si512(&txep[copied + 16]); + const __m512i d = _mm512_loadu_si512(&txep[copied + 24]); + + _mm512_storeu_si512(&cache_objs[copied], a); + _mm512_storeu_si512(&cache_objs[copied + 8], b); + _mm512_storeu_si512(&cache_objs[copied + 16], c); + _mm512_storeu_si512(&cache_objs[copied + 24], d); + copied += 32; + } + cache->len += n; + + if (cache->len >= cache->flushthresh) { + rte_mempool_ops_enqueue_bulk(mp, + &cache->objs[cache->size], + cache->len - cache->size); + cache->len = cache->size; + } + goto done; + } + + m = rte_pktmbuf_prefree_seg(txep[0].mbuf); + if (likely(m)) { + free[0] = m; + nb_free = 1; + for (i = 1; i < n; i++) { + m = rte_pktmbuf_prefree_seg(txep[i].mbuf); + if (likely(m)) { + if (likely(m->pool == free[0]->pool)) { + free[nb_free++] = m; + } else { + rte_mempool_put_bulk(free[0]->pool, + (void *)free, + nb_free); + free[0] = m; + nb_free = 1; + } + } + } + rte_mempool_put_bulk(free[0]->pool, (void **)free, nb_free); + } else { + for (i = 1; i < n; i++) { + m = rte_pktmbuf_prefree_seg(txep[i].mbuf); + if (m) + rte_mempool_put(m->pool, m); + } + } + +done: + /* buffers were freed, update counters */ + txq->nb_free = (uint16_t)(txq->nb_free + txq->rs_thresh); + txq->next_dd = (uint16_t)(txq->next_dd + txq->rs_thresh); + if (txq->next_dd >= txq->nb_tx_desc) + txq->next_dd = (uint16_t)(txq->rs_thresh - 1); + + return txq->rs_thresh; +} + +static __rte_always_inline void +tx_backlog_entry_avx512(struct iavf_tx_vec_entry *txep, + struct rte_mbuf **tx_pkts, uint16_t nb_pkts) +{ + int i; + + for (i = 0; i < (int)nb_pkts; ++i) + txep[i].mbuf = tx_pkts[i]; +} + +static inline void +iavf_vtx1(volatile struct iavf_tx_desc *txdp, + struct rte_mbuf *pkt, uint64_t flags) +{ + uint64_t high_qw = + (IAVF_TX_DESC_DTYPE_DATA | + ((uint64_t)flags << IAVF_TXD_QW1_CMD_SHIFT) | + ((uint64_t)pkt->data_len << IAVF_TXD_QW1_TX_BUF_SZ_SHIFT)); + + __m128i descriptor = _mm_set_epi64x(high_qw, + pkt->buf_iova + pkt->data_off); + _mm_storeu_si128((__m128i *)txdp, descriptor); +} + +#define IAVF_TX_LEN_MASK 0xAA +#define IAVF_TX_OFF_MASK 0x55 +static inline void +iavf_vtx(volatile struct iavf_tx_desc *txdp, + struct rte_mbuf **pkt, uint16_t nb_pkts, uint64_t flags) +{ + const uint64_t hi_qw_tmpl = (IAVF_TX_DESC_DTYPE_DATA | + ((uint64_t)flags << IAVF_TXD_QW1_CMD_SHIFT)); + + /* if unaligned on 32-bit boundary, do one to align */ + if (((uintptr_t)txdp & 0x1F) != 0 && nb_pkts != 0) { + iavf_vtx1(txdp, *pkt, flags); + nb_pkts--, txdp++, pkt++; + } + + /* do 4 at a time while possible, in bursts */ + for (; nb_pkts > 3; txdp += 4, pkt += 4, nb_pkts -= 4) { + __m512i desc4 = + _mm512_set_epi64 + ((uint64_t)pkt[3]->data_len, + pkt[3]->buf_iova, + (uint64_t)pkt[2]->data_len, + pkt[2]->buf_iova, + (uint64_t)pkt[1]->data_len, + pkt[1]->buf_iova, + (uint64_t)pkt[0]->data_len, + pkt[0]->buf_iova); + __m512i hi_qw_tmpl_4 = _mm512_set1_epi64(hi_qw_tmpl); + __m512i data_off_4 = + _mm512_set_epi64 + (0, + pkt[3]->data_off, + 0, + pkt[2]->data_off, + 0, + pkt[1]->data_off, + 0, + pkt[0]->data_off); + + desc4 = _mm512_mask_slli_epi64(desc4, IAVF_TX_LEN_MASK, desc4, + IAVF_TXD_QW1_TX_BUF_SZ_SHIFT); + desc4 = _mm512_mask_or_epi64(desc4, IAVF_TX_LEN_MASK, desc4, + hi_qw_tmpl_4); + desc4 = _mm512_mask_add_epi64(desc4, IAVF_TX_OFF_MASK, desc4, + data_off_4); + _mm512_storeu_si512((void *)txdp, desc4); + } + + /* do any last ones */ + while (nb_pkts) { + iavf_vtx1(txdp, *pkt, flags); + txdp++, pkt++, nb_pkts--; + } +} + +static inline uint16_t +iavf_xmit_fixed_burst_vec_avx512(void *tx_queue, struct rte_mbuf **tx_pkts, + uint16_t nb_pkts) +{ + struct iavf_tx_queue *txq = (struct iavf_tx_queue *)tx_queue; + volatile struct iavf_tx_desc *txdp; + struct iavf_tx_vec_entry *txep; + uint16_t n, nb_commit, tx_id; + /* bit2 is reserved and must be set to 1 according to Spec */ + uint64_t flags = IAVF_TX_DESC_CMD_EOP | IAVF_TX_DESC_CMD_ICRC; + uint64_t rs = IAVF_TX_DESC_CMD_RS | flags; + + /* cross rx_thresh boundary is not allowed */ + nb_pkts = RTE_MIN(nb_pkts, txq->rs_thresh); + + if (txq->nb_free < txq->free_thresh) + iavf_tx_free_bufs_avx512(txq); + + nb_commit = nb_pkts = (uint16_t)RTE_MIN(txq->nb_free, nb_pkts); + if (unlikely(nb_pkts == 0)) + return 0; + + tx_id = txq->tx_tail; + txdp = &txq->tx_ring[tx_id]; + txep = (void *)txq->sw_ring; + txep += tx_id; + + txq->nb_free = (uint16_t)(txq->nb_free - nb_pkts); + + n = (uint16_t)(txq->nb_tx_desc - tx_id); + if (nb_commit >= n) { + tx_backlog_entry_avx512(txep, tx_pkts, n); + + iavf_vtx(txdp, tx_pkts, n - 1, flags); + tx_pkts += (n - 1); + txdp += (n - 1); + + iavf_vtx1(txdp, *tx_pkts++, rs); + + nb_commit = (uint16_t)(nb_commit - n); + + tx_id = 0; + txq->next_rs = (uint16_t)(txq->rs_thresh - 1); + + /* avoid reach the end of ring */ + txdp = &txq->tx_ring[tx_id]; + txep = (void *)txq->sw_ring; + txep += tx_id; + } + + tx_backlog_entry_avx512(txep, tx_pkts, nb_commit); + + iavf_vtx(txdp, tx_pkts, nb_commit, flags); + + tx_id = (uint16_t)(tx_id + nb_commit); + if (tx_id > txq->next_rs) { + txq->tx_ring[txq->next_rs].cmd_type_offset_bsz |= + rte_cpu_to_le_64(((uint64_t)IAVF_TX_DESC_CMD_RS) << + IAVF_TXD_QW1_CMD_SHIFT); + txq->next_rs = + (uint16_t)(txq->next_rs + txq->rs_thresh); + } + + txq->tx_tail = tx_id; + + IAVF_PCI_REG_WRITE(txq->qtx_tail, txq->tx_tail); + + return nb_pkts; +} + +uint16_t +iavf_xmit_pkts_vec_avx512(void *tx_queue, struct rte_mbuf **tx_pkts, + uint16_t nb_pkts) +{ + uint16_t nb_tx = 0; + struct iavf_tx_queue *txq = (struct iavf_tx_queue *)tx_queue; + + while (nb_pkts) { + uint16_t ret, num; + + num = (uint16_t)RTE_MIN(nb_pkts, txq->rs_thresh); + ret = iavf_xmit_fixed_burst_vec_avx512(tx_queue, &tx_pkts[nb_tx], + num); + nb_tx += ret; + nb_pkts -= ret; + if (ret < num) + break; + } + + return nb_tx; +} + +static inline void +iavf_tx_queue_release_mbufs_avx512(struct iavf_tx_queue *txq) +{ + unsigned int i; + const uint16_t max_desc = (uint16_t)(txq->nb_tx_desc - 1); + struct iavf_tx_vec_entry *swr = (void *)txq->sw_ring; + + if (!txq->sw_ring || txq->nb_free == max_desc) + return; + + i = txq->next_dd - txq->rs_thresh + 1; + if (txq->tx_tail < i) { + for (; i < txq->nb_tx_desc; i++) { + rte_pktmbuf_free_seg(swr[i].mbuf); + swr[i].mbuf = NULL; + } + i = 0; + } +} + +static const struct iavf_txq_ops avx512_vec_txq_ops = { + .release_mbufs = iavf_tx_queue_release_mbufs_avx512, +}; + +int __rte_cold +iavf_txq_vec_setup_avx512(struct iavf_tx_queue *txq) +{ + txq->ops = &avx512_vec_txq_ops; + return 0; +}