[dpdk-dev] [PATCH v3 1/2] net/pcap: move pcap handler to process private

[Qi Zhang]

This is prework for data path enabling for secondary process.
To prevent pcap handler opened by one process be overwritten by
another process, each process should have their private copy,
`rte_eth_dev->process_private` is exactly what we needed.

Signed-off-by: Qi Zhang <qi.z.zhang at intel.com>
---
 drivers/net/pcap/rte_eth_pcap.c | 40 ++++++++++++++++++++++++++++++++++------
 1 file changed, 34 insertions(+), 6 deletions(-)

diff --git a/drivers/net/pcap/rte_eth_pcap.c b/drivers/net/pcap/rte_eth_pcap.c
index 7bbe72e25..88cb404f1 100644
--- a/drivers/net/pcap/rte_eth_pcap.c
+++ b/drivers/net/pcap/rte_eth_pcap.c
@@ -83,6 +83,12 @@ struct pmd_internals {
 	int phy_mac;
 };
 
+struct pmd_process_private {
+	pcap_t *rx_pcap[RTE_PMD_PCAP_MAX_QUEUES];
+	pcap_t *tx_pcap[RTE_PMD_PCAP_MAX_QUEUES];
+	pcap_dumper_t *tx_dumper[RTE_PMD_PCAP_MAX_QUEUES];
+};
+
 struct pmd_devargs {
 	unsigned int num_of_queue;
 	struct devargs_queue {
@@ -646,8 +652,10 @@ eth_rx_queue_setup(struct rte_eth_dev *dev,
 		struct rte_mempool *mb_pool)
 {
 	struct pmd_internals *internals = dev->data->dev_private;
+	struct pmd_process_private *pp = dev->process_private;
 	struct pcap_rx_queue *pcap_q = &internals->rx_queue[rx_queue_id];
 
+	pcap_q->pcap = pp->rx_pcap[rx_queue_id];
 	pcap_q->mb_pool = mb_pool;
 	dev->data->rx_queues[rx_queue_id] = pcap_q;
 	pcap_q->in_port = dev->data->port_id;
@@ -663,8 +671,12 @@ eth_tx_queue_setup(struct rte_eth_dev *dev,
 		const struct rte_eth_txconf *tx_conf __rte_unused)
 {
 	struct pmd_internals *internals = dev->data->dev_private;
+	struct pmd_process_private *pp = dev->process_private;
+	struct pcap_tx_queue *pcap_q = &internals->tx_queue[tx_queue_id];
 
-	dev->data->tx_queues[tx_queue_id] = &internals->tx_queue[tx_queue_id];
+	pcap_q->pcap = pp->tx_pcap[tx_queue_id];
+	pcap_q->dumper = pp->tx_dumper[tx_queue_id];
+	dev->data->tx_queues[tx_queue_id] = pcap_q;
 
 	return 0;
 }
@@ -896,16 +908,29 @@ pmd_init_internals(struct rte_vdev_device *vdev,
 		struct rte_eth_dev **eth_dev)
 {
 	struct rte_eth_dev_data *data;
+	struct pmd_process_private *pp;
 	unsigned int numa_node = vdev->device.numa_node;
 
 	PMD_LOG(INFO, "Creating pcap-backed ethdev on numa socket %d",
 		numa_node);
 
+	pp = (struct pmd_process_private *)
+		rte_zmalloc(NULL, sizeof(struct pmd_process_private),
+				RTE_CACHE_LINE_SIZE);
+
+	if (pp == NULL) {
+		PMD_LOG(ERR,
+			"Failed to allocate memory for process private");
+		return -1;
+	}
+
 	/* reserve an ethdev entry */
 	*eth_dev = rte_eth_vdev_allocate(vdev, sizeof(**internals));
-	if (!(*eth_dev))
+	if (!(*eth_dev)) {
+		rte_free(pp);
 		return -1;
-
+	}
+	(*eth_dev)->process_private = pp;
 	/* now put it all together
 	 * - store queue data in internals,
 	 * - store numa_node info in eth_dev
@@ -1027,6 +1052,7 @@ eth_from_pcaps_common(struct rte_vdev_device *vdev,
 		struct pmd_devargs *tx_queues, const unsigned int nb_tx_queues,
 		struct pmd_internals **internals, struct rte_eth_dev **eth_dev)
 {
+	struct pmd_process_private *pp;
 	unsigned int i;
 
 	/* do some parameter checking */
@@ -1039,11 +1065,12 @@ eth_from_pcaps_common(struct rte_vdev_device *vdev,
 			eth_dev) < 0)
 		return -1;
 
+	pp = (*eth_dev)->process_private;
 	for (i = 0; i < nb_rx_queues; i++) {
 		struct pcap_rx_queue *rx = &(*internals)->rx_queue[i];
 		struct devargs_queue *queue = &rx_queues->queue[i];
 
-		rx->pcap = queue->pcap;
+		pp->rx_pcap[i] = queue->pcap;
 		snprintf(rx->name, sizeof(rx->name), "%s", queue->name);
 		snprintf(rx->type, sizeof(rx->type), "%s", queue->type);
 	}
@@ -1052,8 +1079,8 @@ eth_from_pcaps_common(struct rte_vdev_device *vdev,
 		struct pcap_tx_queue *tx = &(*internals)->tx_queue[i];
 		struct devargs_queue *queue = &tx_queues->queue[i];
 
-		tx->dumper = queue->dumper;
-		tx->pcap = queue->pcap;
+		pp->tx_dumper[i] = queue->dumper;
+		pp->tx_pcap[i] = queue->pcap;
 		snprintf(tx->name, sizeof(tx->name), "%s", queue->name);
 		snprintf(tx->type, sizeof(tx->type), "%s", queue->type);
 	}
@@ -1235,6 +1262,7 @@ pmd_pcap_remove(struct rte_vdev_device *dev)
 			eth_dev->data->mac_addrs = NULL;
 	}
 
+	rte_free(eth_dev->process_private);
 	rte_eth_dev_release_port(eth_dev);
 
 	return 0;
-- 
2.13.6