From: Cunming Liang Date: Tue, 4 Aug 2015 11:47:12 +0000 (+0800) Subject: ixgbe: remove burst size restriction of vector Rx X-Git-Tag: spdx-start~8481 X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=45e73f4208ee98f57d21322a9777d1c7479dbc80;p=dpdk.git ixgbe: remove burst size restriction of vector Rx On receive side, the burst size now floor aligns to RTE_IXGBE_DESCS_PER_LOOP power of 2. According to this rule, the burst size less than 4 still won't receive anything. (Before this change, the burst size less than 32 can't receive anything.) _recv_*_pkts_vec returns no more than 32(RTE_IXGBE_RXQ_REARM_THRESH) packets. On transmit side, the max burst size no longer bind with a constant, however it still requires to check the cross tx_rs_thresh violation. There's no obvious performance drop found on both recv_pkts_vec and recv_scattered_pkts_vec on burst size 32. Signed-off-by: Cunming Liang Reviewed-by: Zoltan Kiss Acked-by: Konstantin Ananyev --- diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c index e0318171f0..a598a72a85 100644 --- a/drivers/net/ixgbe/ixgbe_rxtx.c +++ b/drivers/net/ixgbe/ixgbe_rxtx.c @@ -3940,7 +3940,9 @@ ixgbe_set_rx_function(struct rte_eth_dev *dev) */ } else if (adapter->rx_vec_allowed) { PMD_INIT_LOG(DEBUG, "Vector rx enabled, please make sure RX " - "burst size no less than 32."); + "burst size no less than %d (port=%d).", + RTE_IXGBE_DESCS_PER_LOOP, + dev->data->port_id); dev->rx_pkt_burst = ixgbe_recv_pkts_vec; } else if (adapter->rx_bulk_alloc_allowed) { diff --git a/drivers/net/ixgbe/ixgbe_rxtx.h b/drivers/net/ixgbe/ixgbe_rxtx.h index 113682a85d..b9eca67d29 100644 --- a/drivers/net/ixgbe/ixgbe_rxtx.h +++ b/drivers/net/ixgbe/ixgbe_rxtx.h @@ -47,9 +47,8 @@ (uint64_t) ((mb)->buf_physaddr + RTE_PKTMBUF_HEADROOM) #ifdef RTE_IXGBE_INC_VECTOR -#define RTE_IXGBE_VPMD_RX_BURST 32 -#define RTE_IXGBE_VPMD_TX_BURST 32 -#define RTE_IXGBE_RXQ_REARM_THRESH RTE_IXGBE_VPMD_RX_BURST +#define RTE_IXGBE_RXQ_REARM_THRESH 32 +#define RTE_IXGBE_MAX_RX_BURST RTE_IXGBE_RXQ_REARM_THRESH #define RTE_IXGBE_TX_MAX_FREE_BUF_SZ 64 #endif diff --git a/drivers/net/ixgbe/ixgbe_rxtx_vec.c b/drivers/net/ixgbe/ixgbe_rxtx_vec.c index 6979b1e0ea..3c6d8c5c44 100644 --- a/drivers/net/ixgbe/ixgbe_rxtx_vec.c +++ b/drivers/net/ixgbe/ixgbe_rxtx_vec.c @@ -193,13 +193,13 @@ desc_to_olflags_v(__m128i descs[4], struct rte_mbuf **rx_pkts) #endif /* - * vPMD receive routine, now only accept (nb_pkts == RTE_IXGBE_VPMD_RX_BURST) - * in one loop + * vPMD raw receive routine, only accept(nb_pkts >= RTE_IXGBE_DESCS_PER_LOOP) * * Notice: - * - nb_pkts < RTE_IXGBE_VPMD_RX_BURST, just return no packet - * - nb_pkts > RTE_IXGBE_VPMD_RX_BURST, only scan RTE_IXGBE_VPMD_RX_BURST + * - nb_pkts < RTE_IXGBE_DESCS_PER_LOOP, just return no packet + * - nb_pkts > RTE_IXGBE_MAX_RX_BURST, only scan RTE_IXGBE_MAX_RX_BURST * numbers of DD bit + * - floor align nb_pkts to a RTE_IXGBE_DESC_PER_LOOP power-of-two * - don't support ol_flags for rss and csum err */ static inline uint16_t @@ -223,8 +223,11 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts, __m128i desc_mask = _mm_set_epi32(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFF07F0); - if (unlikely(nb_pkts < RTE_IXGBE_VPMD_RX_BURST)) - return 0; + /* nb_pkts shall be less equal than RTE_IXGBE_MAX_RX_BURST */ + nb_pkts = RTE_MIN(nb_pkts, RTE_IXGBE_MAX_RX_BURST); + + /* nb_pkts has to be floor-aligned to RTE_IXGBE_DESCS_PER_LOOP */ + nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_IXGBE_DESCS_PER_LOOP); /* Just the act of getting into the function from the application is * going to cost about 7 cycles */ @@ -272,7 +275,7 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts, * [C*. extract the end-of-packet bit, if requested] * D. fill info. from desc to mbuf */ - for (pos = 0, nb_pkts_recd = 0; pos < RTE_IXGBE_VPMD_RX_BURST; + for (pos = 0, nb_pkts_recd = 0; pos < nb_pkts; pos += RTE_IXGBE_DESCS_PER_LOOP, rxdp += RTE_IXGBE_DESCS_PER_LOOP) { __m128i descs0[RTE_IXGBE_DESCS_PER_LOOP]; @@ -407,13 +410,13 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts, } /* - * vPMD receive routine, now only accept (nb_pkts == RTE_IXGBE_VPMD_RX_BURST) - * in one loop + * vPMD receive routine, only accept(nb_pkts >= RTE_IXGBE_DESCS_PER_LOOP) * * Notice: - * - nb_pkts < RTE_IXGBE_VPMD_RX_BURST, just return no packet - * - nb_pkts > RTE_IXGBE_VPMD_RX_BURST, only scan RTE_IXGBE_VPMD_RX_BURST + * - nb_pkts < RTE_IXGBE_DESCS_PER_LOOP, just return no packet + * - nb_pkts > RTE_IXGBE_MAX_RX_BURST, only scan RTE_IXGBE_MAX_RX_BURST * numbers of DD bit + * - floor align nb_pkts to a RTE_IXGBE_DESC_PER_LOOP power-of-two * - don't support ol_flags for rss and csum err */ uint16_t @@ -427,12 +430,11 @@ static inline uint16_t reassemble_packets(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_bufs, uint16_t nb_bufs, uint8_t *split_flags) { - struct rte_mbuf *pkts[RTE_IXGBE_VPMD_RX_BURST]; /*finished pkts*/ + struct rte_mbuf *pkts[nb_bufs]; /*finished pkts*/ struct rte_mbuf *start = rxq->pkt_first_seg; struct rte_mbuf *end = rxq->pkt_last_seg; unsigned pkt_idx, buf_idx; - for (buf_idx = 0, pkt_idx = 0; buf_idx < nb_bufs; buf_idx++) { if (end != NULL) { /* processing a split packet */ @@ -492,14 +494,17 @@ reassemble_packets(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_bufs, * * Notice: * - don't support ol_flags for rss and csum err - * - now only accept (nb_pkts == RTE_IXGBE_VPMD_RX_BURST) + * - nb_pkts < RTE_IXGBE_DESCS_PER_LOOP, just return no packet + * - nb_pkts > RTE_IXGBE_MAX_RX_BURST, only scan RTE_IXGBE_MAX_RX_BURST + * numbers of DD bit + * - floor align nb_pkts to a RTE_IXGBE_DESC_PER_LOOP power-of-two */ uint16_t ixgbe_recv_scattered_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) { struct ixgbe_rx_queue *rxq = rx_queue; - uint8_t split_flags[RTE_IXGBE_VPMD_RX_BURST] = {0}; + uint8_t split_flags[RTE_IXGBE_MAX_RX_BURST] = {0}; /* get some new buffers */ uint16_t nb_bufs = _recv_raw_pkts_vec(rxq, rx_pkts, nb_pkts, @@ -624,8 +629,8 @@ ixgbe_xmit_pkts_vec(void *tx_queue, struct rte_mbuf **tx_pkts, uint64_t rs = IXGBE_ADVTXD_DCMD_RS|DCMD_DTYP_FLAGS; int i; - if (unlikely(nb_pkts > RTE_IXGBE_VPMD_TX_BURST)) - nb_pkts = RTE_IXGBE_VPMD_TX_BURST; + /* cross rx_thresh boundary is not allowed */ + nb_pkts = RTE_MIN(nb_pkts, txq->tx_rs_thresh); if (txq->nb_tx_free < txq->tx_free_thresh) ixgbe_tx_free_bufs(txq);