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From: Alexander Kozyrev <akozyrev@mellanox.com>
To: dev@dpdk.org
Cc: stable@dpdk.org, rasland@mellanox.com, viacheslavo@mellanox.com
Subject: [dpdk-stable] [PATCH] net/mlx5: fix vectorized Rx burst termination
Date: Tue,  2 Jun 2020 03:50:41 +0000
Message-ID: <1591069841-7846-1-git-send-email-akozyrev@mellanox.com> (raw)

Maximum burst size of Vectorized Rx burst routine is set to
MLX5_VPMD_RX_MAX_BURST(64). This limits the performance of any
application that would like to gather more than 64 packets from
the single Rx burst for batch processing (i.e. VPP).

The situation gets worse with a mix of zipped and unzipped CQEs.
They are processed separately and the Rx burst function returns
small number of packets every call.

Repeat the cycle of gathering packets from the vectorized Rx routine
until a requested number of packets are collected or there are no
more CQEs left to process.

Fixes: 6cb559d67b83 ("net/mlx5: add vectorized Rx/Tx burst for x86")
Cc: stable@dpdk.org

Signed-off-by: Alexander Kozyrev <akozyrev@mellanox.com>
Acked-by: Slava Ovsiienko <viacheslavo@mellanox.com>
---
 drivers/net/mlx5/mlx5_rxtx_vec.c         | 19 +++++++++++++------
 drivers/net/mlx5/mlx5_rxtx_vec_altivec.h | 13 ++++++++++---
 drivers/net/mlx5/mlx5_rxtx_vec_neon.h    | 13 ++++++++++---
 drivers/net/mlx5/mlx5_rxtx_vec_sse.h     | 13 ++++++++++---
 4 files changed, 43 insertions(+), 15 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_rxtx_vec.c b/drivers/net/mlx5/mlx5_rxtx_vec.c
index 1518bdd..b38bd20 100644
--- a/drivers/net/mlx5/mlx5_rxtx_vec.c
+++ b/drivers/net/mlx5/mlx5_rxtx_vec.c
@@ -103,13 +103,20 @@
 mlx5_rx_burst_vec(void *dpdk_rxq, struct rte_mbuf **pkts, uint16_t pkts_n)
 {
 	struct mlx5_rxq_data *rxq = dpdk_rxq;
-	uint16_t nb_rx;
+	uint16_t nb_rx = 0;
+	uint16_t tn = 0;
 	uint64_t err = 0;
-
-	nb_rx = rxq_burst_v(rxq, pkts, pkts_n, &err);
-	if (unlikely(err | rxq->err_state))
-		nb_rx = rxq_handle_pending_error(rxq, pkts, nb_rx);
-	return nb_rx;
+	bool no_cq = false;
+
+	do {
+		nb_rx = rxq_burst_v(rxq, pkts + tn, pkts_n - tn, &err, &no_cq);
+		if (unlikely(err | rxq->err_state))
+			nb_rx = rxq_handle_pending_error(rxq, pkts + tn, nb_rx);
+		tn += nb_rx;
+		if (unlikely(no_cq))
+			break;
+	} while (tn != pkts_n);
+	return tn;
 }
 
 /**
diff --git a/drivers/net/mlx5/mlx5_rxtx_vec_altivec.h b/drivers/net/mlx5/mlx5_rxtx_vec_altivec.h
index 26715ef..b55138a 100644
--- a/drivers/net/mlx5/mlx5_rxtx_vec_altivec.h
+++ b/drivers/net/mlx5/mlx5_rxtx_vec_altivec.h
@@ -564,13 +564,15 @@
  * @param[out] err
  *   Pointer to a flag. Set non-zero value if pkts array has at least one error
  *   packet to handle.
+ * @param[out] no_cq
+ *  Pointer to a boolean. Set true if no new CQE seen.
  *
  * @return
  *   Number of packets received including errors (<= pkts_n).
  */
 static inline uint16_t
 rxq_burst_v(struct mlx5_rxq_data *rxq, struct rte_mbuf **pkts, uint16_t pkts_n,
-	    uint64_t *err)
+	    uint64_t *err, bool *no_cq)
 {
 	const uint16_t q_n = 1 << rxq->cqe_n;
 	const uint16_t q_mask = q_n - 1;
@@ -663,8 +665,10 @@
 	/* Not to cross queue end. */
 	pkts_n = RTE_MIN(pkts_n, q_n - elts_idx);
 	pkts_n = RTE_MIN(pkts_n, q_n - cq_idx);
-	if (!pkts_n)
+	if (!pkts_n) {
+		*no_cq = !rcvd_pkt;
 		return rcvd_pkt;
+	}
 	/* At this point, there shouldn't be any remaining packets. */
 	MLX5_ASSERT(rxq->decompressed == 0);
 
@@ -1079,8 +1083,10 @@
 			break;
 	}
 	/* If no new CQE seen, return without updating cq_db. */
-	if (unlikely(!nocmp_n && comp_idx == MLX5_VPMD_DESCS_PER_LOOP))
+	if (unlikely(!nocmp_n && comp_idx == MLX5_VPMD_DESCS_PER_LOOP)) {
+		*no_cq = true;
 		return rcvd_pkt;
+	}
 	/* Update the consumer indexes for non-compressed CQEs. */
 	MLX5_ASSERT(nocmp_n <= pkts_n);
 	rxq->cq_ci += nocmp_n;
@@ -1108,6 +1114,7 @@
 	}
 	rte_compiler_barrier();
 	*rxq->cq_db = rte_cpu_to_be_32(rxq->cq_ci);
+	*no_cq = !rcvd_pkt;
 	return rcvd_pkt;
 }
 
diff --git a/drivers/net/mlx5/mlx5_rxtx_vec_neon.h b/drivers/net/mlx5/mlx5_rxtx_vec_neon.h
index ecafbf8..3007c03 100644
--- a/drivers/net/mlx5/mlx5_rxtx_vec_neon.h
+++ b/drivers/net/mlx5/mlx5_rxtx_vec_neon.h
@@ -378,13 +378,15 @@
  * @param[out] err
  *   Pointer to a flag. Set non-zero value if pkts array has at least one error
  *   packet to handle.
+ * @param[out] no_cq
+ *   Pointer to a boolean. Set true if no new CQE seen.
  *
  * @return
  *   Number of packets received including errors (<= pkts_n).
  */
 static inline uint16_t
 rxq_burst_v(struct mlx5_rxq_data *rxq, struct rte_mbuf **pkts, uint16_t pkts_n,
-	    uint64_t *err)
+	    uint64_t *err, bool *no_cq)
 {
 	const uint16_t q_n = 1 << rxq->cqe_n;
 	const uint16_t q_mask = q_n - 1;
@@ -485,8 +487,10 @@
 	/* Not to cross queue end. */
 	pkts_n = RTE_MIN(pkts_n, q_n - elts_idx);
 	pkts_n = RTE_MIN(pkts_n, q_n - cq_idx);
-	if (!pkts_n)
+	if (!pkts_n) {
+		*no_cq = !rcvd_pkt;
 		return rcvd_pkt;
+	}
 	/* At this point, there shouldn't be any remained packets. */
 	MLX5_ASSERT(rxq->decompressed == 0);
 	/*
@@ -745,8 +749,10 @@
 			break;
 	}
 	/* If no new CQE seen, return without updating cq_db. */
-	if (unlikely(!nocmp_n && comp_idx == MLX5_VPMD_DESCS_PER_LOOP))
+	if (unlikely(!nocmp_n && comp_idx == MLX5_VPMD_DESCS_PER_LOOP)) {
+		*no_cq = true;
 		return rcvd_pkt;
+	}
 	/* Update the consumer indexes for non-compressed CQEs. */
 	MLX5_ASSERT(nocmp_n <= pkts_n);
 	rxq->cq_ci += nocmp_n;
@@ -774,6 +780,7 @@
 	}
 	rte_cio_wmb();
 	*rxq->cq_db = rte_cpu_to_be_32(rxq->cq_ci);
+	*no_cq = !rcvd_pkt;
 	return rcvd_pkt;
 }
 
diff --git a/drivers/net/mlx5/mlx5_rxtx_vec_sse.h b/drivers/net/mlx5/mlx5_rxtx_vec_sse.h
index 6847ae7..da5960a 100644
--- a/drivers/net/mlx5/mlx5_rxtx_vec_sse.h
+++ b/drivers/net/mlx5/mlx5_rxtx_vec_sse.h
@@ -385,13 +385,15 @@
  * @param[out] err
  *   Pointer to a flag. Set non-zero value if pkts array has at least one error
  *   packet to handle.
+ * @param[out] no_cq
+ *   Pointer to a boolean. Set true if no new CQE seen.
  *
  * @return
  *   Number of packets received including errors (<= pkts_n).
  */
 static inline uint16_t
 rxq_burst_v(struct mlx5_rxq_data *rxq, struct rte_mbuf **pkts, uint16_t pkts_n,
-	    uint64_t *err)
+	    uint64_t *err, bool *no_cq)
 {
 	const uint16_t q_n = 1 << rxq->cqe_n;
 	const uint16_t q_mask = q_n - 1;
@@ -473,8 +475,10 @@
 	/* Not to cross queue end. */
 	pkts_n = RTE_MIN(pkts_n, q_n - elts_idx);
 	pkts_n = RTE_MIN(pkts_n, q_n - cq_idx);
-	if (!pkts_n)
+	if (!pkts_n) {
+		*no_cq = !rcvd_pkt;
 		return rcvd_pkt;
+	}
 	/* At this point, there shouldn't be any remained packets. */
 	MLX5_ASSERT(rxq->decompressed == 0);
 	/*
@@ -696,8 +700,10 @@
 			break;
 	}
 	/* If no new CQE seen, return without updating cq_db. */
-	if (unlikely(!nocmp_n && comp_idx == MLX5_VPMD_DESCS_PER_LOOP))
+	if (unlikely(!nocmp_n && comp_idx == MLX5_VPMD_DESCS_PER_LOOP)) {
+		*no_cq = true;
 		return rcvd_pkt;
+	}
 	/* Update the consumer indexes for non-compressed CQEs. */
 	MLX5_ASSERT(nocmp_n <= pkts_n);
 	rxq->cq_ci += nocmp_n;
@@ -725,6 +731,7 @@
 	}
 	rte_compiler_barrier();
 	*rxq->cq_db = rte_cpu_to_be_32(rxq->cq_ci);
+	*no_cq = !rcvd_pkt;
 	return rcvd_pkt;
 }
 
-- 
1.8.3.1


             reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-02  3:50 Alexander Kozyrev [this message]
2020-06-02  5:59 ` [dpdk-stable] [dpdk-dev] " Matan Azrad
2020-06-03 12:33 ` [dpdk-stable] " Raslan Darawsheh

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