[dpdk-dev] [PATCH 1/2] xenvirt: add support for PCI Port Hotplug

[Bernard Iremonger]

Signed-off-by: Bernard Iremonger <bernard.iremonger at intel.com>
---
 drivers/net/xenvirt/rte_eth_xenvirt.c | 63 +++++++++++++++++++++++++++++++----
 drivers/net/xenvirt/rte_xen_lib.c     | 26 ++++++++++++---
 drivers/net/xenvirt/rte_xen_lib.h     |  5 ++-
 3 files changed, 83 insertions(+), 11 deletions(-)

diff --git a/drivers/net/xenvirt/rte_eth_xenvirt.c b/drivers/net/xenvirt/rte_eth_xenvirt.c
index b3383af..8923826 100644
--- a/drivers/net/xenvirt/rte_eth_xenvirt.c
+++ b/drivers/net/xenvirt/rte_eth_xenvirt.c
@@ -1,7 +1,7 @@
 /*-
  *   BSD LICENSE
  *
- *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
  *   All rights reserved.
  *
  *   Redistribution and use in source and binary forms, with or without
@@ -642,10 +642,14 @@ eth_dev_xenvirt_create(const char *name, const char *params,
 	if (internals == NULL)
 		goto err;
 
-	/* reserve an ethdev entry */
-	eth_dev = rte_eth_dev_allocate(name, RTE_ETH_DEV_VIRTUAL);
-	if (eth_dev == NULL)
-		goto err;
+	/* find an ethdev entry */
+	eth_dev = rte_eth_dev_allocated(name);
+	if (eth_dev == NULL) {
+		/* reserve an ethdev entry */
+		eth_dev = rte_eth_dev_allocate(name, RTE_ETH_DEV_VIRTUAL);
+		if (eth_dev == NULL)
+			goto err;
+	}
 
 	data->dev_private = internals;
 	data->port_id = eth_dev->data->port_id;
@@ -661,7 +665,7 @@ eth_dev_xenvirt_create(const char *name, const char *params,
 
 	eth_dev->data = data;
 	eth_dev->dev_ops = &ops;
-	eth_dev->data->dev_flags = 0;
+	eth_dev->data->dev_flags = RTE_PCI_DRV_DETACHABLE;
 	eth_dev->data->kdrv = RTE_KDRV_NONE;
 	eth_dev->data->drv_name = NULL;
 	eth_dev->driver = NULL;
@@ -683,6 +687,38 @@ err:
 }
 
 
+static int
+eth_dev_xenvirt_free(const char *name, const unsigned numa_node)
+{
+	struct rte_eth_dev *eth_dev = NULL;
+
+	RTE_LOG(DEBUG, PMD,
+		"Free virtio rings backed ethdev on numa socket %u\n",
+		numa_node);
+
+	/* find an ethdev entry */
+	eth_dev = rte_eth_dev_allocated(name);
+	if (eth_dev == NULL)
+		return -1;
+
+	if (eth_dev->data->dev_started == 1) {
+		eth_dev_stop(eth_dev);
+		eth_dev_close(eth_dev);
+	}
+
+	eth_dev->rx_pkt_burst = NULL;
+	eth_dev->tx_pkt_burst = NULL;
+	eth_dev->dev_ops = NULL;
+
+	rte_free(eth_dev->data);
+	rte_free(eth_dev->data->dev_private);
+	rte_free(eth_dev->data->mac_addrs);
+
+	virtio_idx--;
+
+	return 0;
+}
+
 /*TODO: Support multiple process model */
 static int
 rte_pmd_xenvirt_devinit(const char *name, const char *params)
@@ -701,10 +737,25 @@ rte_pmd_xenvirt_devinit(const char *name, const char *params)
 	return 0;
 }
 
+static int
+rte_pmd_xenvirt_devuninit(const char *name)
+{
+	eth_dev_xenvirt_free(name, rte_socket_id());
+
+	if (virtio_idx == 0) {
+		if (xenstore_uninit() != 0)
+			RTE_LOG(ERR, PMD, "%s: xenstore uninit failed\n", __func__);
+
+		gntalloc_close();
+	}
+	return 0;
+}
+
 static struct rte_driver pmd_xenvirt_drv = {
 	.name = "eth_xenvirt",
 	.type = PMD_VDEV,
 	.init = rte_pmd_xenvirt_devinit,
+	.uninit = rte_pmd_xenvirt_devuninit,
 };
 
 PMD_REGISTER_DRIVER(pmd_xenvirt_drv);
diff --git a/drivers/net/xenvirt/rte_xen_lib.c b/drivers/net/xenvirt/rte_xen_lib.c
index b3932f0..5900b53 100644
--- a/drivers/net/xenvirt/rte_xen_lib.c
+++ b/drivers/net/xenvirt/rte_xen_lib.c
@@ -1,7 +1,7 @@
 /*-
  *   BSD LICENSE
  *
- *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
  *   All rights reserved.
  *
  *   Redistribution and use in source and binary forms, with or without
@@ -50,6 +50,7 @@
 
 #include <rte_common.h>
 #include <rte_string_fns.h>
+#include <rte_malloc.h>
 
 #include "rte_xen_lib.h"
 
@@ -72,6 +73,8 @@ int gntalloc_fd = -1;
 static char *dompath = NULL;
 /* handle to xenstore read/write operations */
 static struct xs_handle *xs = NULL;
+/* flag to indicate if xenstore cleanup is required */
+static bool is_xenstore_cleaned_up;
 
 /*
  * Reserve a virtual address space.
@@ -275,7 +278,6 @@ xenstore_init(void)
 {
 	unsigned int len, domid;
 	char *buf;
-	static int cleanup = 0;
 	char *end;
 
 	xs = xs_domain_open();
@@ -301,16 +303,32 @@ xenstore_init(void)
 
 	xs_transaction_start(xs); /* When to stop transaction */
 
-	if (cleanup == 0) {
+	if (is_xenstore_cleaned_up == 0) {
 		if (xenstore_cleanup())
 			return -1;
-		cleanup = 1;
+		is_xenstore_cleaned_up = 1;
 	}
 
 	return 0;
 }
 
 int
+xenstore_uninit(void)
+{
+	xs_close(xs);
+
+	if (is_xenstore_cleaned_up == 0) {
+		if (xenstore_cleanup())
+			return -1;
+		is_xenstore_cleaned_up = 1;
+	}
+	free(dompath);
+	dompath = NULL;
+
+	return 0;
+}
+
+int
 xenstore_write(const char *key_str, const char *val_str)
 {
 	char grant_path[PATH_MAX];
diff --git a/drivers/net/xenvirt/rte_xen_lib.h b/drivers/net/xenvirt/rte_xen_lib.h
index 0ba7148..d973eac 100644
--- a/drivers/net/xenvirt/rte_xen_lib.h
+++ b/drivers/net/xenvirt/rte_xen_lib.h
@@ -1,7 +1,7 @@
 /*-
  *   BSD LICENSE
  *
- *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
  *   All rights reserved.
  *
  *   Redistribution and use in source and binary forms, with or without
@@ -93,6 +93,9 @@ int
 xenstore_init(void);
 
 int
+xenstore_uninit(void);
+
+int
 xenstore_write(const char *key_str, const char *val_str);
 
 int
-- 
1.9.1