[dpdk-dev] [PATCH v3] af_packet: make the device detachable

[Wojciech Zmuda <woz@semihalf.com>]

Allow dynamic deallocation of af_packet device through proper
API functions. To achieve this:
* set device flag to RTE_ETH_DEV_DETACHABLE
* implement rte_pmd_af_packet_devuninit() and expose it
  through rte_driver.uninit()
* copy device name to ethdev->data to make discoverable with
  rte_eth_dev_allocated()
Moreover, make af_packet init function static, as there is no
reason to keep it public.

Signed-off-by: Wojciech Zmuda <woz@semihalf.com>
---
v3:
* Rephrased feature note in release notes.
* Rephrased commit log.
* Added API change note in release notes.
* Made init function static.
* Removed af_packet header file, as it is not needed
  after init function is not public anymore.

v2:
* Fixed typo and a comment.
* Added feature to the 2.3 release notes.
* Free memory allocated for rx and tx queues.

 doc/guides/rel_notes/release_2_3.rst               |  6 +++
 drivers/net/af_packet/Makefile                     |  5 --
 drivers/net/af_packet/rte_eth_af_packet.c          | 43 ++++++++++++++++--
 drivers/net/af_packet/rte_eth_af_packet.h          | 53 ----------------------
 .../net/af_packet/rte_pmd_af_packet_version.map    |  3 --
 5 files changed, 45 insertions(+), 65 deletions(-)
 delete mode 100644 drivers/net/af_packet/rte_eth_af_packet.h

diff --git a/doc/guides/rel_notes/release_2_3.rst b/doc/guides/rel_notes/release_2_3.rst
index 7945694..da4abc3 100644
--- a/doc/guides/rel_notes/release_2_3.rst
+++ b/doc/guides/rel_notes/release_2_3.rst
@@ -39,6 +39,9 @@ This section should contain new features added in this release. Sample format:
 
   Enabled virtio 1.0 support for virtio pmd driver.
 
+* **Added af_packet dynamic removal function.**
+
+  Af_packet device can now be detached using API, like other PMD devices.
 
 Resolved Issues
 ---------------
@@ -91,6 +94,9 @@ This section should contain API changes. Sample format:
 * Add a short 1-2 sentence description of the API change. Use fixed width
   quotes for ``rte_function_names`` or ``rte_struct_names``. Use the past tense.
 
+* Af_packet device init function is no longer public. Device should be attached
+  with API.
+
 
 ABI Changes
 -----------
diff --git a/drivers/net/af_packet/Makefile b/drivers/net/af_packet/Makefile
index ce5d239..cb1a7ae 100644
--- a/drivers/net/af_packet/Makefile
+++ b/drivers/net/af_packet/Makefile
@@ -50,11 +50,6 @@ CFLAGS += $(WERROR_FLAGS)
 #
 SRCS-$(CONFIG_RTE_LIBRTE_PMD_AF_PACKET) += rte_eth_af_packet.c
 
-#
-# Export include files
-#
-SYMLINK-y-include += rte_eth_af_packet.h
-
 # this lib depends upon:
 DEPDIRS-$(CONFIG_RTE_LIBRTE_PMD_AF_PACKET) += lib/librte_mbuf
 DEPDIRS-$(CONFIG_RTE_LIBRTE_PMD_AF_PACKET) += lib/librte_ether
diff --git a/drivers/net/af_packet/rte_eth_af_packet.c b/drivers/net/af_packet/rte_eth_af_packet.c
index 767f36b..5544528 100644
--- a/drivers/net/af_packet/rte_eth_af_packet.c
+++ b/drivers/net/af_packet/rte_eth_af_packet.c
@@ -53,8 +53,6 @@
 #include <unistd.h>
 #include <poll.h>
 
-#include "rte_eth_af_packet.h"
-
 #define ETH_AF_PACKET_IFACE_ARG		"iface"
 #define ETH_AF_PACKET_NUM_Q_ARG		"qpairs"
 #define ETH_AF_PACKET_BLOCKSIZE_ARG	"blocksz"
@@ -65,6 +63,8 @@
 #define DFLT_FRAME_SIZE		(1 << 11)
 #define DFLT_FRAME_COUNT	(1 << 9)
 
+#define RTE_PMD_AF_PACKET_MAX_RINGS 16
+
 struct pkt_rx_queue {
 	int sockfd;
 
@@ -667,11 +667,13 @@ rte_pmd_init_internals(const char *name,
 	data->nb_tx_queues = (uint16_t)nb_queues;
 	data->dev_link = pmd_link;
 	data->mac_addrs = &(*internals)->eth_addr;
+	strncpy(data->name,
+		(*eth_dev)->data->name, strlen((*eth_dev)->data->name));
 
 	(*eth_dev)->data = data;
 	(*eth_dev)->dev_ops = &ops;
 	(*eth_dev)->driver = NULL;
-	(*eth_dev)->data->dev_flags = 0;
+	(*eth_dev)->data->dev_flags = RTE_ETH_DEV_DETACHABLE;
 	(*eth_dev)->data->drv_name = drivername;
 	(*eth_dev)->data->kdrv = RTE_KDRV_NONE;
 	(*eth_dev)->data->numa_node = numa_node;
@@ -798,7 +800,7 @@ rte_eth_from_packet(const char *name,
 	return 0;
 }
 
-int
+static int
 rte_pmd_af_packet_devinit(const char *name, const char *params)
 {
 	unsigned numa_node;
@@ -836,10 +838,43 @@ exit:
 	return ret;
 }
 
+static int
+rte_pmd_af_packet_devuninit(const char *name)
+{
+	struct rte_eth_dev *eth_dev = NULL;
+	struct pmd_internals *internals;
+	unsigned q;
+
+	RTE_LOG(INFO, PMD, "Closing AF_PACKET ethdev on numa socket %u\n",
+			rte_socket_id());
+
+	if (name == NULL)
+		return -1;
+
+	/* find the ethdev entry */
+	eth_dev = rte_eth_dev_allocated(name);
+	if (eth_dev == NULL)
+		return -1;
+
+	internals = eth_dev->data->dev_private;
+	for (q = 0; q < internals->nb_queues; q++) {
+		rte_free(internals->rx_queue[q].rd);
+		rte_free(internals->tx_queue[q].rd);
+	}
+
+	rte_free(eth_dev->data->dev_private);
+	rte_free(eth_dev->data);
+
+	rte_eth_dev_release_port(eth_dev);
+
+	return 0;
+}
+
 static struct rte_driver pmd_af_packet_drv = {
 	.name = "eth_af_packet",
 	.type = PMD_VDEV,
 	.init = rte_pmd_af_packet_devinit,
+	.uninit = rte_pmd_af_packet_devuninit,
 };
 
 PMD_REGISTER_DRIVER(pmd_af_packet_drv);
diff --git a/drivers/net/af_packet/rte_eth_af_packet.h b/drivers/net/af_packet/rte_eth_af_packet.h
deleted file mode 100644
index 5d1bc7e..0000000
--- a/drivers/net/af_packet/rte_eth_af_packet.h
+++ /dev/null
@@ -1,53 +0,0 @@
-/*-
- *   BSD LICENSE
- *
- *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
- *   All rights reserved.
- *
- *   Redistribution and use in source and binary forms, with or without
- *   modification, are permitted provided that the following conditions
- *   are met:
- *
- *     * Redistributions of source code must retain the above copyright
- *       notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above copyright
- *       notice, this list of conditions and the following disclaimer in
- *       the documentation and/or other materials provided with the
- *       distribution.
- *     * Neither the name of Intel Corporation nor the names of its
- *       contributors may be used to endorse or promote products derived
- *       from this software without specific prior written permission.
- *
- *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef _RTE_ETH_AF_PACKET_H_
-#define _RTE_ETH_AF_PACKET_H_
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#define RTE_PMD_AF_PACKET_MAX_RINGS 16
-
-/**
- * For use by the EAL only. Called as part of EAL init to set up any dummy NICs
- * configured on command line.
- */
-int rte_pmd_af_packet_devinit(const char *name, const char *params);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
diff --git a/drivers/net/af_packet/rte_pmd_af_packet_version.map b/drivers/net/af_packet/rte_pmd_af_packet_version.map
index de95169..ef35398 100644
--- a/drivers/net/af_packet/rte_pmd_af_packet_version.map
+++ b/drivers/net/af_packet/rte_pmd_af_packet_version.map
@@ -1,7 +1,4 @@
 DPDK_2.0 {
-	global:
-
-	rte_pmd_af_packet_devinit;
 
 	local: *;
 };
-- 
1.9.1