[dpdk-dev] [PATCH] ethdev: add field for device data per process

[Alejandro Lucero <alejandro.lucero@netronome.com>]

Primary and secondary processes share a per-device private data. With
current design it is not possible to have data per-device per-process.
This is required for handling properly the CPP interface inside the NFP
PMD with multiprocess support.

There is also at least another PMD driver, tap, with similar
requirements for per-process device data.

Signed-off-by: Alejandro Lucero <alejandro.lucero@netronome.com>
---
 lib/librte_ethdev/rte_ethdev_core.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/librte_ethdev/rte_ethdev_core.h b/lib/librte_ethdev/rte_ethdev_core.h
index 33d12b3..9f29889 100644
--- a/lib/librte_ethdev/rte_ethdev_core.h
+++ b/lib/librte_ethdev/rte_ethdev_core.h
@@ -539,7 +539,13 @@ struct rte_eth_dev {
 	eth_rx_burst_t rx_pkt_burst; /**< Pointer to PMD receive function. */
 	eth_tx_burst_t tx_pkt_burst; /**< Pointer to PMD transmit function. */
 	eth_tx_prep_t tx_pkt_prepare; /**< Pointer to PMD transmit prepare function. */
-	struct rte_eth_dev_data *data;  /**< Pointer to device data */
+	/**
+	 * Next two fields are per-device data but *data is shared between
+	 * primary and secondary processes and *process_private is per-process
+	 * private.
+	 */
+	struct rte_eth_dev_data *data;  /**< Pointer to device data. */
+	void *process_private; /**< Pointer to per-process device data. */
 	const struct eth_dev_ops *dev_ops; /**< Functions exported by PMD */
 	struct rte_device *device; /**< Backing device */
 	struct rte_intr_handle *intr_handle; /**< Device interrupt handle */
-- 
1.9.1