From: Bruce Richardson Date: Thu, 6 Apr 2017 11:32:16 +0000 (+0100) Subject: net/i40e: eliminate mbuf write on rearm X-Git-Tag: spdx-start~3614 X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=f4356d7ca1686531798aea20dd7dd589b8946141;p=dpdk.git net/i40e: eliminate mbuf write on rearm With the mbuf rework, we now have 8 contiguous bytes to be rearmed in the mbuf just before the 8-bytes of olflags. If we don't do the rearm write inside the descriptor ring replenishment function, and delay it to receiving the packet, we can do a single 16B write inside the RX function to set both the rearm data, and the flags together. Signed-off-by: Bruce Richardson Acked-by: Jianbo Liu --- diff --git a/drivers/net/i40e/i40e_rxtx_vec_sse.c b/drivers/net/i40e/i40e_rxtx_vec_sse.c index fdd4a34d80..c43d1c371d 100644 --- a/drivers/net/i40e/i40e_rxtx_vec_sse.c +++ b/drivers/net/i40e/i40e_rxtx_vec_sse.c @@ -82,19 +82,10 @@ i40e_rxq_rearm(struct i40e_rx_queue *rxq) /* Initialize the mbufs in vector, process 2 mbufs in one loop */ for (i = 0; i < RTE_I40E_RXQ_REARM_THRESH; i += 2, rxep += 2) { __m128i vaddr0, vaddr1; - uintptr_t p0, p1; mb0 = rxep[0].mbuf; mb1 = rxep[1].mbuf; - /* Flush mbuf with pkt template. - * Data to be rearmed is 6 bytes long. - */ - p0 = (uintptr_t)&mb0->rearm_data; - *(uint64_t *)p0 = rxq->mbuf_initializer; - p1 = (uintptr_t)&mb1->rearm_data; - *(uint64_t *)p1 = rxq->mbuf_initializer; - /* load buf_addr(lo 64bit) and buf_physaddr(hi 64bit) */ vaddr0 = _mm_loadu_si128((__m128i *)&mb0->buf_addr); vaddr1 = _mm_loadu_si128((__m128i *)&mb1->buf_addr); @@ -125,6 +116,13 @@ i40e_rxq_rearm(struct i40e_rx_queue *rxq) I40E_PCI_REG_WRITE(rxq->qrx_tail, rx_id); } +static inline void +desc_to_olflags_v(struct i40e_rx_queue *rxq, __m128i descs[4] __rte_unused, + struct rte_mbuf **rx_pkts) +{ + const __m128i mbuf_init = _mm_set_epi64x(0, rxq->mbuf_initializer); + __m128i rearm0, rearm1, rearm2, rearm3; + /* Handling the offload flags (olflags) field takes computation * time when receiving packets. Therefore we provide a flag to disable * the processing of the olflags field when they are not needed. This @@ -133,9 +131,6 @@ i40e_rxq_rearm(struct i40e_rx_queue *rxq) */ #ifdef RTE_LIBRTE_I40E_RX_OLFLAGS_ENABLE -static inline void -desc_to_olflags_v(__m128i descs[4], struct rte_mbuf **rx_pkts) -{ __m128i vlan0, vlan1, rss, l3_l4e; /* mask everything except RSS, flow director and VLAN flags @@ -203,14 +198,27 @@ desc_to_olflags_v(__m128i descs[4], struct rte_mbuf **rx_pkts) vlan0 = _mm_or_si128(vlan0, rss); vlan0 = _mm_or_si128(vlan0, l3_l4e); - rx_pkts[0]->ol_flags = _mm_extract_epi16(vlan0, 0); - rx_pkts[1]->ol_flags = _mm_extract_epi16(vlan0, 2); - rx_pkts[2]->ol_flags = _mm_extract_epi16(vlan0, 4); - rx_pkts[3]->ol_flags = _mm_extract_epi16(vlan0, 6); -} + /* + * At this point, we have the 4 sets of flags in the low 16-bits + * of each 32-bit value in vlan0. + * We want to extract these, and merge them with the mbuf init data + * so we can do a single 16-byte write to the mbuf to set the flags + * and all the other initialization fields. Extracting the + * appropriate flags means that we have to do a shift and blend for + * each mbuf before we do the write. + */ + rearm0 = _mm_blend_epi16(mbuf_init, _mm_slli_si128(vlan0, 8), 0x10); + rearm1 = _mm_blend_epi16(mbuf_init, _mm_slli_si128(vlan0, 4), 0x10); + rearm2 = _mm_blend_epi16(mbuf_init, vlan0, 0x10); + rearm3 = _mm_blend_epi16(mbuf_init, _mm_srli_si128(vlan0, 4), 0x10); #else -#define desc_to_olflags_v(desc, rx_pkts) do {} while (0) + rearm0 = rearm1 = rearm2 = rearm3 = mbuf_init; #endif + _mm_store_si128((__m128i *)&rx_pkts[0]->rearm_data, rearm0); + _mm_store_si128((__m128i *)&rx_pkts[1]->rearm_data, rearm1); + _mm_store_si128((__m128i *)&rx_pkts[2]->rearm_data, rearm2); + _mm_store_si128((__m128i *)&rx_pkts[3]->rearm_data, rearm3); +} #define PKTLEN_SHIFT 10 @@ -369,7 +377,7 @@ _recv_raw_pkts_vec(struct i40e_rx_queue *rxq, struct rte_mbuf **rx_pkts, /* C.1 4=>2 filter staterr info only */ sterr_tmp1 = _mm_unpackhi_epi32(descs[1], descs[0]); - desc_to_olflags_v(descs, &rx_pkts[pos]); + desc_to_olflags_v(rxq, descs, &rx_pkts[pos]); /* D.2 pkt 3,4 set in_port/nb_seg and remove crc */ pkt_mb4 = _mm_add_epi16(pkt_mb4, crc_adjust);