From c3d62cc95379e6222d4aa5b9074ece24f34c6a8c Mon Sep 17 00:00:00 2001 From: Adrien Mazarguil Date: Fri, 24 Jun 2016 15:17:59 +0200 Subject: [PATCH] net/mlx5: check remaining space while processing Tx burst The space necessary to store segmented packets cannot be known in advance and must be verified for each of them. Signed-off-by: Adrien Mazarguil Signed-off-by: Nelio Laranjeiro --- drivers/net/mlx5/mlx5_rxtx.c | 144 +++++++++++++++++++---------------- 1 file changed, 78 insertions(+), 66 deletions(-) diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c index 4934d34e33..f270ef933f 100644 --- a/drivers/net/mlx5/mlx5_rxtx.c +++ b/drivers/net/mlx5/mlx5_rxtx.c @@ -585,50 +585,51 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n) struct txq *txq = (struct txq *)dpdk_txq; uint16_t elts_head = txq->elts_head; const unsigned int elts_n = txq->elts_n; - unsigned int i; + unsigned int i = 0; unsigned int max; unsigned int comp; volatile union mlx5_wqe *wqe; - struct rte_mbuf *buf; if (unlikely(!pkts_n)) return 0; - buf = pkts[0]; /* Prefetch first packet cacheline. */ tx_prefetch_cqe(txq, txq->cq_ci); tx_prefetch_cqe(txq, txq->cq_ci + 1); - rte_prefetch0(buf); + rte_prefetch0(*pkts); /* Start processing. */ txq_complete(txq); max = (elts_n - (elts_head - txq->elts_tail)); if (max > elts_n) max -= elts_n; - assert(max >= 1); - assert(max <= elts_n); - /* Always leave one free entry in the ring. */ - --max; - if (max == 0) - return 0; - if (max > pkts_n) - max = pkts_n; - for (i = 0; (i != max); ++i) { - unsigned int elts_head_next = (elts_head + 1) & (elts_n - 1); + do { + struct rte_mbuf *buf; + unsigned int elts_head_next; uintptr_t addr; uint32_t length; uint32_t lkey; + /* + * Make sure there is enough room to store this packet and + * that one ring entry remains unused. + */ + if (max < 1 + 1) + break; + --max; + --pkts_n; + buf = *(pkts++); + elts_head_next = (elts_head + 1) & (elts_n - 1); wqe = &(*txq->wqes)[txq->wqe_ci & (txq->wqe_n - 1)]; rte_prefetch0(wqe); - if (i + 1 < max) - rte_prefetch0(pkts[i + 1]); + if (pkts_n) + rte_prefetch0(*pkts); /* Retrieve buffer information. */ addr = rte_pktmbuf_mtod(buf, uintptr_t); length = DATA_LEN(buf); /* Update element. */ (*txq->elts)[elts_head] = buf; /* Prefetch next buffer data. */ - if (i + 1 < max) - rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 1], + if (pkts_n) + rte_prefetch0(rte_pktmbuf_mtod(*pkts, volatile void *)); /* Retrieve Memory Region key for this memory pool. */ lkey = txq_mp2mr(txq, txq_mb2mp(buf)); @@ -652,8 +653,8 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n) txq->stats.obytes += length; #endif elts_head = elts_head_next; - buf = pkts[i + 1]; - } + ++i; + } while (pkts_n); /* Take a shortcut if nothing must be sent. */ if (unlikely(i == 0)) return 0; @@ -697,44 +698,45 @@ mlx5_tx_burst_inline(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n) struct txq *txq = (struct txq *)dpdk_txq; uint16_t elts_head = txq->elts_head; const unsigned int elts_n = txq->elts_n; - unsigned int i; + unsigned int i = 0; unsigned int max; unsigned int comp; volatile union mlx5_wqe *wqe; - struct rte_mbuf *buf; unsigned int max_inline = txq->max_inline; if (unlikely(!pkts_n)) return 0; - buf = pkts[0]; /* Prefetch first packet cacheline. */ tx_prefetch_cqe(txq, txq->cq_ci); tx_prefetch_cqe(txq, txq->cq_ci + 1); - rte_prefetch0(buf); + rte_prefetch0(*pkts); /* Start processing. */ txq_complete(txq); max = (elts_n - (elts_head - txq->elts_tail)); if (max > elts_n) max -= elts_n; - assert(max >= 1); - assert(max <= elts_n); - /* Always leave one free entry in the ring. */ - --max; - if (max == 0) - return 0; - if (max > pkts_n) - max = pkts_n; - for (i = 0; (i != max); ++i) { - unsigned int elts_head_next = (elts_head + 1) & (elts_n - 1); + do { + struct rte_mbuf *buf; + unsigned int elts_head_next; uintptr_t addr; uint32_t length; uint32_t lkey; + /* + * Make sure there is enough room to store this packet and + * that one ring entry remains unused. + */ + if (max < 1 + 1) + break; + --max; + --pkts_n; + buf = *(pkts++); + elts_head_next = (elts_head + 1) & (elts_n - 1); wqe = &(*txq->wqes)[txq->wqe_ci & (txq->wqe_n - 1)]; tx_prefetch_wqe(txq, txq->wqe_ci); tx_prefetch_wqe(txq, txq->wqe_ci + 1); - if (i + 1 < max) - rte_prefetch0(pkts[i + 1]); + if (pkts_n) + rte_prefetch0(*pkts); /* Should we enable HW CKSUM offload */ if (buf->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_TCP_CKSUM | PKT_TX_UDP_CKSUM)) { @@ -750,8 +752,8 @@ mlx5_tx_burst_inline(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n) /* Update element. */ (*txq->elts)[elts_head] = buf; /* Prefetch next buffer data. */ - if (i + 1 < max) - rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 1], + if (pkts_n) + rte_prefetch0(rte_pktmbuf_mtod(*pkts, volatile void *)); if (length <= max_inline) { if (buf->ol_flags & PKT_TX_VLAN_PKT) @@ -771,12 +773,12 @@ mlx5_tx_burst_inline(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n) } wqe->inl.ctrl.data[2] = 0; elts_head = elts_head_next; - buf = pkts[i + 1]; #ifdef MLX5_PMD_SOFT_COUNTERS /* Increment sent bytes counter. */ txq->stats.obytes += length; #endif - } + ++i; + } while (pkts_n); /* Take a shortcut if nothing must be sent. */ if (unlikely(i == 0)) return 0; @@ -887,13 +889,15 @@ mlx5_tx_burst_mpw(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n) struct txq *txq = (struct txq *)dpdk_txq; uint16_t elts_head = txq->elts_head; const unsigned int elts_n = txq->elts_n; - unsigned int i; + unsigned int i = 0; unsigned int max; unsigned int comp; struct mlx5_mpw mpw = { .state = MLX5_MPW_STATE_CLOSED, }; + if (unlikely(!pkts_n)) + return 0; /* Prefetch first packet cacheline. */ tx_prefetch_cqe(txq, txq->cq_ci); tx_prefetch_wqe(txq, txq->wqe_ci); @@ -903,22 +907,24 @@ mlx5_tx_burst_mpw(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n) max = (elts_n - (elts_head - txq->elts_tail)); if (max > elts_n) max -= elts_n; - assert(max >= 1); - assert(max <= elts_n); - /* Always leave one free entry in the ring. */ - --max; - if (max == 0) - return 0; - if (max > pkts_n) - max = pkts_n; - for (i = 0; (i != max); ++i) { - struct rte_mbuf *buf = pkts[i]; + do { + struct rte_mbuf *buf; volatile struct mlx5_wqe_data_seg *dseg; - unsigned int elts_head_next = (elts_head + 1) & (elts_n - 1); + unsigned int elts_head_next; uintptr_t addr; uint32_t length; uint32_t cs_flags = 0; + /* + * Make sure there is enough room to store this packet and + * that one ring entry remains unused. + */ + if (max < 1 + 1) + break; + --max; + --pkts_n; + buf = *(pkts++); + elts_head_next = (elts_head + 1) & (elts_n - 1); /* Should we enable HW CKSUM offload */ if (buf->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_TCP_CKSUM | PKT_TX_UDP_CKSUM)) @@ -951,7 +957,8 @@ mlx5_tx_burst_mpw(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n) /* Increment sent bytes counter. */ txq->stats.obytes += length; #endif - } + ++i; + } while (pkts_n); /* Take a shortcut if nothing must be sent. */ if (unlikely(i == 0)) return 0; @@ -1059,7 +1066,7 @@ mlx5_tx_burst_mpw_inline(void *dpdk_txq, struct rte_mbuf **pkts, struct txq *txq = (struct txq *)dpdk_txq; uint16_t elts_head = txq->elts_head; const unsigned int elts_n = txq->elts_n; - unsigned int i; + unsigned int i = 0; unsigned int max; unsigned int comp; unsigned int inline_room = txq->max_inline; @@ -1067,6 +1074,8 @@ mlx5_tx_burst_mpw_inline(void *dpdk_txq, struct rte_mbuf **pkts, .state = MLX5_MPW_STATE_CLOSED, }; + if (unlikely(!pkts_n)) + return 0; /* Prefetch first packet cacheline. */ tx_prefetch_cqe(txq, txq->cq_ci); tx_prefetch_wqe(txq, txq->wqe_ci); @@ -1076,21 +1085,23 @@ mlx5_tx_burst_mpw_inline(void *dpdk_txq, struct rte_mbuf **pkts, max = (elts_n - (elts_head - txq->elts_tail)); if (max > elts_n) max -= elts_n; - assert(max >= 1); - assert(max <= elts_n); - /* Always leave one free entry in the ring. */ - --max; - if (max == 0) - return 0; - if (max > pkts_n) - max = pkts_n; - for (i = 0; (i != max); ++i) { - struct rte_mbuf *buf = pkts[i]; - unsigned int elts_head_next = (elts_head + 1) & (elts_n - 1); + do { + struct rte_mbuf *buf; + unsigned int elts_head_next; uintptr_t addr; uint32_t length; uint32_t cs_flags = 0; + /* + * Make sure there is enough room to store this packet and + * that one ring entry remains unused. + */ + if (max < 1 + 1) + break; + --max; + --pkts_n; + buf = *(pkts++); + elts_head_next = (elts_head + 1) & (elts_n - 1); /* Should we enable HW CKSUM offload */ if (buf->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_TCP_CKSUM | PKT_TX_UDP_CKSUM)) @@ -1177,7 +1188,8 @@ mlx5_tx_burst_mpw_inline(void *dpdk_txq, struct rte_mbuf **pkts, /* Increment sent bytes counter. */ txq->stats.obytes += length; #endif - } + ++i; + } while (pkts_n); /* Take a shortcut if nothing must be sent. */ if (unlikely(i == 0)) return 0; -- 2.20.1