ethdev: add field for device data per process

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>
Reviewed-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

doc/guides/rel_notes/release_18_11.rst

@@ -342,7 +342,7 @@ The libraries prepended with a plus sign were incremented in this version.
      librte_cryptodev.so.5
      librte_distributor.so.1
    + librte_eal.so.9
-     librte_ethdev.so.10
+   + librte_ethdev.so.11
    + librte_eventdev.so.6
      librte_flow_classify.so.1
      librte_gro.so.1

lib/librte_ethdev/Makefile

@@ -16,7 +16,7 @@ LDLIBS += -lrte_mbuf -lrte_kvargs
 
 EXPORT_MAP := rte_ethdev_version.map
 
-LIBABIVER := 10
+LIBABIVER := 11
 
 SRCS-y += ethdev_private.c
 SRCS-y += rte_ethdev.c

lib/librte_ethdev/meson.build

@@ -2,7 +2,7 @@
 # Copyright(c) 2017 Intel Corporation
 
 name = 'ethdev'
-version = 10
+version = 11
 allow_experimental_apis = true
 sources = files('ethdev_private.c',
 	'ethdev_profile.c',

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. The second one is managed by PMDs if necessary.
+	 */
+	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 */