[dpdk-dev] [PATCH 07/11] vdev: allow external registration of virtual device drivers
Olivier Matz
olivier.matz at 6wind.com
Fri Feb 28 18:25:46 CET 2014
Instead of having a list of virtual device drivers in EAL code, add an
API to register drivers. Thanks to this change:
- we don't need to reference pmd_ring, pmd_pcap and pmd_xenvirt in EAL code
- it is now possible to provide a virtual device driver as a shared
library.
The registration is done in an init function flaged with
__attribute__((constructor)). The new convention is to name this
function rte_pmd_xyz_init(). The per-device init function is renamed
rte_pmd_xyz_devinit().
By the way the internal PMDs are now also .so/standalone ready. Let's do
it later on. It will be required to ease maintenance.
Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>
---
app/test/test_pmd_ring.c | 6 +--
lib/librte_eal/common/eal_common_vdev.c | 72 +++++++++++++++-----------------
lib/librte_eal/linuxapp/eal/eal.c | 7 ++--
lib/librte_pmd_pcap/rte_eth_pcap.c | 16 ++++++-
lib/librte_pmd_pcap/rte_eth_pcap.h | 8 ----
lib/librte_pmd_ring/rte_eth_ring.c | 15 ++++++-
lib/librte_pmd_ring/rte_eth_ring.h | 6 +--
lib/librte_pmd_xenvirt/rte_eth_xenvirt.c | 14 ++++++-
lib/librte_pmd_xenvirt/rte_eth_xenvirt.h | 4 +-
9 files changed, 85 insertions(+), 63 deletions(-)
diff --git a/app/test/test_pmd_ring.c b/app/test/test_pmd_ring.c
index c8242b3..4d9c2ba 100644
--- a/app/test/test_pmd_ring.c
+++ b/app/test/test_pmd_ring.c
@@ -315,12 +315,12 @@ test_pmd_ring_init(void)
printf("Testing ring pmd init\n");
- if (rte_pmd_ring_init(name1, params_null) < 0) {
+ if (rte_pmd_ring_devinit(name1, params_null) < 0) {
printf("Testing ring pmd init fail\n");
return -1;
}
- if (rte_pmd_ring_init(name2, params) < 0) {
+ if (rte_pmd_ring_devinit(name2, params) < 0) {
printf("Testing ring pmd init fail\n");
return -1;
}
@@ -372,7 +372,7 @@ test_pmd_ring_init(void)
rte_eth_dev_stop(RXTX_PORT2);
/* Test init same name pmd ring */
- rte_pmd_ring_init(name1, params_null);
+ rte_pmd_ring_devinit(name1, params_null);
return 0;
}
diff --git a/lib/librte_eal/common/eal_common_vdev.c b/lib/librte_eal/common/eal_common_vdev.c
index 02d3fd6..84547c7 100644
--- a/lib/librte_eal/common/eal_common_vdev.c
+++ b/lib/librte_eal/common/eal_common_vdev.c
@@ -34,7 +34,11 @@
#include <string.h>
#include <inttypes.h>
-#include <rte_string_fns.h>
+#include <sys/queue.h>
+
+#include <rte_vdev.h>
+#include <rte_devargs.h>
+#include <rte_debug.h>
#ifdef RTE_LIBRTE_PMD_RING
#include <rte_eth_ring.h>
#endif
@@ -46,44 +50,37 @@
#endif
#include <rte_debug.h>
#include <rte_devargs.h>
+
#include "eal_private.h"
-struct device_init {
- const char *dev_prefix;
- int (*init_fn)(const char*, const char *);
-};
+/** Global list of virtual device drivers. */
+static struct rte_vdev_driver_list vdev_driver_list =
+ TAILQ_HEAD_INITIALIZER(vdev_driver_list);
-#define NUM_DEV_TYPES (sizeof(dev_types)/sizeof(dev_types[0]))
-struct device_init dev_types[] = {
-#ifdef RTE_LIBRTE_PMD_RING
- {
- .dev_prefix = RTE_ETH_RING_PARAM_NAME,
- .init_fn = rte_pmd_ring_init
- },
-#endif
-#ifdef RTE_LIBRTE_PMD_PCAP
- {
- .dev_prefix = RTE_ETH_PCAP_PARAM_NAME,
- .init_fn = rte_pmd_pcap_init
- },
-#endif
-#ifdef RTE_LIBRTE_PMD_XENVIRT
- {
- .dev_prefix = RTE_ETH_XENVIRT_PARAM_NAME,
- .init_fn = rte_pmd_xenvirt_init
- },
-#endif
- {
- .dev_prefix = "-nodev-",
- .init_fn = NULL
- }
-};
+/* register a driver */
+void
+rte_eal_vdev_driver_register(struct rte_vdev_driver *driver)
+{
+ TAILQ_INSERT_TAIL(&vdev_driver_list, driver, next);
+}
+
+/* unregister a driver */
+void
+rte_eal_vdev_driver_unregister(struct rte_vdev_driver *driver)
+{
+ TAILQ_REMOVE(&vdev_driver_list, driver, next);
+}
int
rte_eal_vdev_init(void)
{
struct rte_devargs *devargs;
- uint8_t i;
+ struct rte_vdev_driver *driver;
+
+ /* No need to register drivers that are embeded in DPDK
+ * (pmd_pcap, pmd_ring, ...). The initialization function have
+ * the ((constructor)) attribute so they will register at
+ * startup. */
/* call the init function for each virtual device */
TAILQ_FOREACH(devargs, &devargs_list, next) {
@@ -91,18 +88,17 @@ rte_eal_vdev_init(void)
if (devargs->type != RTE_DEVTYPE_VIRTUAL)
continue;
- for (i = 0; i < NUM_DEV_TYPES; i++) {
+ TAILQ_FOREACH(driver, &vdev_driver_list, next) {
/* search a driver prefix in virtual device name */
- if (!strncmp(dev_types[i].dev_prefix,
- devargs->virtual.drv_name,
- sizeof(dev_types[i].dev_prefix) - 1)) {
- dev_types[i].init_fn(devargs->virtual.drv_name,
- devargs->args);
+ if (!strncmp(driver->name, devargs->virtual.drv_name,
+ strlen(driver->name))) {
+ driver->init(devargs->virtual.drv_name,
+ devargs->args);
break;
}
}
- if (i == NUM_DEV_TYPES) {
+ if (driver == NULL) {
rte_panic("no driver found for %s\n",
devargs->virtual.drv_name);
}
diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c
index 2f3222d..6502755 100644
--- a/lib/librte_eal/linuxapp/eal/eal.c
+++ b/lib/librte_eal/linuxapp/eal/eal.c
@@ -1039,10 +1039,8 @@ rte_eal_init(int argc, char **argv)
rte_eal_mcfg_complete();
- if (rte_eal_vdev_init() < 0)
- rte_panic("Cannot init virtual devices\n");
-
TAILQ_FOREACH(solib, &solib_list, next) {
+ RTE_LOG(INFO, EAL, "open shared lib %s\n", solib->name);
solib->lib_handle = dlopen(solib->name, RTLD_NOW);
if ((solib->lib_handle == NULL) && (solib->name[0] != '/')) {
/* relative path: try again with "./" prefix */
@@ -1054,6 +1052,9 @@ rte_eal_init(int argc, char **argv)
RTE_LOG(WARNING, EAL, "%s\n", dlerror());
}
+ if (rte_eal_vdev_init() < 0)
+ rte_panic("Cannot init virtual devices\n");
+
RTE_LOG(DEBUG, EAL, "Master core %u is ready (tid=%x)\n",
rte_config.master_lcore, (int)thread_id);
diff --git a/lib/librte_pmd_pcap/rte_eth_pcap.c b/lib/librte_pmd_pcap/rte_eth_pcap.c
index 03e6e6c..15f7469 100644
--- a/lib/librte_pmd_pcap/rte_eth_pcap.c
+++ b/lib/librte_pmd_pcap/rte_eth_pcap.c
@@ -40,6 +40,7 @@
#include <rte_string_fns.h>
#include <rte_cycles.h>
#include <rte_kvargs.h>
+#include <rte_vdev.h>
#include <net/if.h>
@@ -697,8 +698,8 @@ rte_eth_from_pcaps(pcap_t * const rx_queues[],
}
-int
-rte_pmd_pcap_init(const char *name, const char *params)
+static int
+rte_pmd_pcap_devinit(const char *name, const char *params)
{
unsigned numa_node, using_dumpers = 0;
int ret;
@@ -777,3 +778,14 @@ rte_pmd_pcap_init(const char *name, const char *params)
}
+static struct rte_vdev_driver pmd_pcap_drv = {
+ .name = "eth_pcap",
+ .init = rte_pmd_pcap_devinit,
+};
+
+__attribute__((constructor))
+static void
+rte_pmd_pcap_init(void)
+{
+ rte_eal_vdev_driver_register(&pmd_pcap_drv);
+}
diff --git a/lib/librte_pmd_pcap/rte_eth_pcap.h b/lib/librte_pmd_pcap/rte_eth_pcap.h
index c0bc5d8..473b6cb 100644
--- a/lib/librte_pmd_pcap/rte_eth_pcap.h
+++ b/lib/librte_pmd_pcap/rte_eth_pcap.h
@@ -45,8 +45,6 @@ extern "C" {
#undef PCAP_CAN_SEND
#endif
-#define RTE_ETH_PCAP_PARAM_NAME "eth_pcap"
-
/* struct args_dict is declared in rte_eth_pcap_args_parser.h */
struct args_dict;
@@ -64,12 +62,6 @@ int rte_eth_from_pcaps_n_dumpers(pcap_t * const rx_queues[],
const unsigned numa_node,
struct args_dict *dict);
-/**
- * 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_pcap_init(const char *name, const char *params);
-
#ifdef __cplusplus
}
#endif
diff --git a/lib/librte_pmd_ring/rte_eth_ring.c b/lib/librte_pmd_ring/rte_eth_ring.c
index 24635f3..cee3fff 100644
--- a/lib/librte_pmd_ring/rte_eth_ring.c
+++ b/lib/librte_pmd_ring/rte_eth_ring.c
@@ -37,6 +37,7 @@
#include <rte_malloc.h>
#include <rte_memcpy.h>
#include <rte_string_fns.h>
+#include <rte_vdev.h>
struct ring_queue {
struct rte_ring *rng;
@@ -382,7 +383,7 @@ rte_eth_ring_pair_attach(const char *name, const unsigned numa_node)
}
int
-rte_pmd_ring_init(const char *name, const char *params)
+rte_pmd_ring_devinit(const char *name, const char *params)
{
RTE_LOG(INFO, PMD, "Initializing pmd_ring for %s\n", name);
@@ -395,3 +396,15 @@ rte_pmd_ring_init(const char *name, const char *params)
}
return 0;
}
+
+static struct rte_vdev_driver pmd_ring_drv = {
+ .name = "eth_ring",
+ .init = rte_pmd_ring_devinit,
+};
+
+__attribute__((constructor))
+static void
+rte_pmd_ring_init(void)
+{
+ rte_eal_vdev_driver_register(&pmd_ring_drv);
+}
diff --git a/lib/librte_pmd_ring/rte_eth_ring.h b/lib/librte_pmd_ring/rte_eth_ring.h
index a222ecb..b84a29e 100644
--- a/lib/librte_pmd_ring/rte_eth_ring.h
+++ b/lib/librte_pmd_ring/rte_eth_ring.h
@@ -40,8 +40,6 @@ extern "C" {
#include <rte_ring.h>
-#define RTE_ETH_RING_PARAM_NAME "eth_ring"
-
int rte_eth_from_rings(struct rte_ring * const rx_queues[],
const unsigned nb_rx_queues,
struct rte_ring *const tx_queues[],
@@ -52,10 +50,10 @@ int rte_eth_ring_pair_create(const char *name, const unsigned numa_node);
int rte_eth_ring_pair_attach(const char *name, const unsigned numa_node);
/**
- * For use by the EAL only. Called as part of EAL init to set up any dummy NICs
+ * For use by test apps only. Called as part of EAL init to set up any dummy NICs
* configured on command line.
*/
-int rte_pmd_ring_init(const char *name, const char *params);
+int rte_pmd_ring_devinit(const char *name, const char *params);
#ifdef __cplusplus
}
diff --git a/lib/librte_pmd_xenvirt/rte_eth_xenvirt.c b/lib/librte_pmd_xenvirt/rte_eth_xenvirt.c
index bad8dd4..d142973 100644
--- a/lib/librte_pmd_xenvirt/rte_eth_xenvirt.c
+++ b/lib/librte_pmd_xenvirt/rte_eth_xenvirt.c
@@ -689,7 +689,7 @@ err:
/*TODO: Support multiple process model */
int
-rte_pmd_xenvirt_init(const char *name, const char *params)
+rte_pmd_xenvirt_devinit(const char *name, const char *params)
{
if (virtio_idx == 0) {
if (xenstore_init() != 0) {
@@ -704,3 +704,15 @@ rte_pmd_xenvirt_init(const char *name, const char *params)
eth_dev_xenvirt_create(name, params, rte_socket_id(), DEV_CREATE);
return 0;
}
+
+static struct rte_vdev_driver pmd_xenvirt_drv = {
+ .name = "eth_xenvirt",
+ .init = rte_pmd_xenvirt_devinit,
+};
+
+__attribute__((constructor))
+static void
+rte_pmd_xenvirt_init(void)
+{
+ rte_eal_vdev_driver_register(&pmd_xenvirt_drv);
+}
diff --git a/lib/librte_pmd_xenvirt/rte_eth_xenvirt.h b/lib/librte_pmd_xenvirt/rte_eth_xenvirt.h
index cb1924a..f3f3220 100644
--- a/lib/librte_pmd_xenvirt/rte_eth_xenvirt.h
+++ b/lib/librte_pmd_xenvirt/rte_eth_xenvirt.h
@@ -41,13 +41,11 @@ extern "C" {
#include <rte_mempool.h>
#include <rte_ring.h>
-#define RTE_ETH_XENVIRT_PARAM_NAME "eth_xenvirt"
-
/**
* 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_xenvirt_init(const char *name, const char *params);
+int rte_pmd_xenvirt_devinit(const char *name, const char *params);
/**
* Creates mempool for xen virtio PMD.
--
1.8.5.3
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