[dpdk-dev] [PATCH v5 02/14] fm10k: add vPMD pre-condition check for each RX queue

["Chen Jing D(Mark)" <jing.d.chen@intel.com>]

From: "Chen Jing D(Mark)" <jing.d.chen@intel.com>

Add condition check in rx_queue_setup func. If number of RX desc
can't satisfy vPMD requirement, record it into a variable. Or
call fm10k_rxq_vec_setup to initialize Vector RX.

Signed-off-by: Chen Jing D(Mark) <jing.d.chen@intel.com>
---
 drivers/net/fm10k/fm10k.h          |   11 ++++++++---
 drivers/net/fm10k/fm10k_ethdev.c   |   11 +++++++++++
 drivers/net/fm10k/fm10k_rxtx_vec.c |   21 +++++++++++++++++++++
 3 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/drivers/net/fm10k/fm10k.h b/drivers/net/fm10k/fm10k.h
index c089882..362a2d0 100644
--- a/drivers/net/fm10k/fm10k.h
+++ b/drivers/net/fm10k/fm10k.h
@@ -135,6 +135,8 @@ struct fm10k_dev_info {
 	/* Protect the mailbox to avoid race condition */
 	rte_spinlock_t    mbx_lock;
 	struct fm10k_macvlan_filter_info    macvlan;
+	/* Flag to indicate if RX vector conditions satisfied */
+	bool rx_vec_allowed;
 };
 
 /*
@@ -165,9 +167,10 @@ struct fm10k_rx_queue {
 	struct rte_mempool *mp;
 	struct rte_mbuf **sw_ring;
 	volatile union fm10k_rx_desc *hw_ring;
-	struct rte_mbuf *pkt_first_seg; /**< First segment of current packet. */
-	struct rte_mbuf *pkt_last_seg;  /**< Last segment of current packet. */
+	struct rte_mbuf *pkt_first_seg; /* First segment of current packet. */
+	struct rte_mbuf *pkt_last_seg;  /* Last segment of current packet. */
 	uint64_t hw_ring_phys_addr;
+	uint64_t mbuf_initializer; /* value to init mbufs */
 	uint16_t next_dd;
 	uint16_t next_alloc;
 	uint16_t next_trigger;
@@ -177,7 +180,7 @@ struct fm10k_rx_queue {
 	uint16_t queue_id;
 	uint8_t port_id;
 	uint8_t drop_en;
-	uint8_t rx_deferred_start; /**< don't start this queue in dev start. */
+	uint8_t rx_deferred_start; /* don't start this queue in dev start. */
 };
 
 /*
@@ -313,4 +316,6 @@ uint16_t fm10k_recv_scattered_pkts(void *rx_queue,
 
 uint16_t fm10k_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 	uint16_t nb_pkts);
+
+int fm10k_rxq_vec_setup(struct fm10k_rx_queue *rxq);
 #endif
diff --git a/drivers/net/fm10k/fm10k_ethdev.c b/drivers/net/fm10k/fm10k_ethdev.c
index b104fc2..680a7fe 100644
--- a/drivers/net/fm10k/fm10k_ethdev.c
+++ b/drivers/net/fm10k/fm10k_ethdev.c
@@ -1252,6 +1252,7 @@ fm10k_rx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_id,
 	const struct rte_eth_rxconf *conf, struct rte_mempool *mp)
 {
 	struct fm10k_hw *hw = FM10K_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct fm10k_dev_info *dev_info = FM10K_DEV_PRIVATE_TO_INFO(dev);
 	struct fm10k_rx_queue *q;
 	const struct rte_memzone *mz;
 
@@ -1334,6 +1335,16 @@ fm10k_rx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_id,
 	q->hw_ring_phys_addr = mz->phys_addr;
 #endif
 
+	/* Check if number of descs satisfied Vector requirement */
+	if (!rte_is_power_of_2(nb_desc)) {
+		PMD_INIT_LOG(DEBUG, "queue[%d] doesn't meet Vector Rx "
+				    "preconditions - canceling the feature for "
+				    "the whole port[%d]",
+			     q->queue_id, q->port_id);
+		dev_info->rx_vec_allowed = false;
+	} else
+		fm10k_rxq_vec_setup(q);
+
 	dev->data->rx_queues[queue_id] = q;
 	return 0;
 }
diff --git a/drivers/net/fm10k/fm10k_rxtx_vec.c b/drivers/net/fm10k/fm10k_rxtx_vec.c
index 69174d9..34b677b 100644
--- a/drivers/net/fm10k/fm10k_rxtx_vec.c
+++ b/drivers/net/fm10k/fm10k_rxtx_vec.c
@@ -43,3 +43,24 @@
 #ifndef __INTEL_COMPILER
 #pragma GCC diagnostic ignored "-Wcast-qual"
 #endif
+
+int __attribute__((cold))
+fm10k_rxq_vec_setup(struct fm10k_rx_queue *rxq)
+{
+	uintptr_t p;
+	struct rte_mbuf mb_def = { .buf_addr = 0 }; /* zeroed mbuf */
+
+	mb_def.nb_segs = 1;
+	/* data_off will be ajusted after new mbuf allocated for 512-byte
+	 * alignment.
+	 */
+	mb_def.data_off = RTE_PKTMBUF_HEADROOM;
+	mb_def.port = rxq->port_id;
+	rte_mbuf_refcnt_set(&mb_def, 1);
+
+	/* prevent compiler reordering: rearm_data covers previous fields */
+	rte_compiler_barrier();
+	p = (uintptr_t)&mb_def.rearm_data;
+	rxq->mbuf_initializer = *(uint64_t *)p;
+	return 0;
+}
-- 
1.7.7.6