[dpdk-dev] [PATCH 1/2] lib/librte_ether: ensure not overwrite device data
Marcin Kerlin
marcinx.kerlin at intel.com
Fri Jul 29 17:56:58 CEST 2016
Added ensure consistent device data in the multiprocess application. Primary
process creates array rte_eth_dev_data[] and secondary process appends in the
first free place rather than at the beginning. This behavior prevents
overwriting devices of primary process by secondary process. Two arrays
rte_eth_dev_data[] and rte_eth_devices[] are shifted relative to each other
and it required the addition new functions to search separately data.
Signed-off-by: Marcin Kerlin <marcinx.kerlin at intel.com>
---
lib/librte_ether/rte_ethdev.c | 87 ++++++++++++++++++++++++++++++----
lib/librte_ether/rte_ethdev.h | 23 +++++++++
lib/librte_ether/rte_ether_version.map | 8 ++++
3 files changed, 110 insertions(+), 8 deletions(-)
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index f62a9ec..a8f89c9 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -177,6 +177,19 @@ rte_eth_dev_allocated(const char *name)
return NULL;
}
+struct rte_eth_dev_data *
+rte_eth_dev_data_shared_allocated(const char *name)
+{
+ unsigned i;
+
+ for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
+ if (strcmp(rte_eth_dev_data[i].name, name) == 0)
+ return &rte_eth_dev_data[i];
+ }
+
+ return NULL;
+}
+
static uint8_t
rte_eth_dev_find_free_port(void)
{
@@ -189,10 +202,43 @@ rte_eth_dev_find_free_port(void)
return RTE_MAX_ETHPORTS;
}
+static uint8_t
+rte_eth_dev_find_free_dev_data_id(void)
+{
+ unsigned i;
+
+ for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
+ if (!strlen(rte_eth_dev_data[i].name))
+ return i;
+ }
+ return RTE_MAX_ETHPORTS;
+}
+
+int
+rte_eth_dev_release_dev_data(uint8_t port_id)
+{
+ char device[RTE_ETH_NAME_MAX_LEN];
+ struct rte_eth_dev_data *eth_dev_data = NULL;
+
+ /* get device name by port id */
+ if (rte_eth_dev_get_name_by_port(port_id, device))
+ return -EINVAL;
+
+ /* look for an entry in the shared device data */
+ eth_dev_data = rte_eth_dev_data_shared_allocated(device);
+ if (eth_dev_data == NULL)
+ return -EINVAL;
+
+ /* clear an entry in the shared device data */
+ memset(eth_dev_data, 0, sizeof(struct rte_eth_dev_data));
+
+ return 0;
+}
+
struct rte_eth_dev *
rte_eth_dev_allocate(const char *name, enum rte_eth_dev_type type)
{
- uint8_t port_id;
+ uint8_t port_id, dev_data_id;
struct rte_eth_dev *eth_dev;
port_id = rte_eth_dev_find_free_port();
@@ -204,14 +250,28 @@ rte_eth_dev_allocate(const char *name, enum rte_eth_dev_type type)
if (rte_eth_dev_data == NULL)
rte_eth_dev_data_alloc();
+ dev_data_id = rte_eth_dev_find_free_dev_data_id();
+
+ if (dev_data_id == RTE_MAX_ETHPORTS) {
+ RTE_PMD_DEBUG_TRACE("Reached maximum number of Ethernet ports by all "
+ "the processes\n");
+ return NULL;
+ }
+
if (rte_eth_dev_allocated(name) != NULL) {
RTE_PMD_DEBUG_TRACE("Ethernet Device with name %s already allocated!\n",
name);
return NULL;
}
+ if (rte_eth_dev_data_shared_allocated(name) != NULL) {
+ RTE_PMD_DEBUG_TRACE("Ethernet Device with name %s already allocated by "
+ "another process!\n", name);
+ return NULL;
+ }
+
eth_dev = &rte_eth_devices[port_id];
- eth_dev->data = &rte_eth_dev_data[port_id];
+ eth_dev->data = &rte_eth_dev_data[dev_data_id];
snprintf(eth_dev->data->name, sizeof(eth_dev->data->name), "%s", name);
eth_dev->data->port_id = port_id;
eth_dev->attached = DEV_ATTACHED;
@@ -237,6 +297,7 @@ rte_eth_dev_create_unique_device_name(char *name, size_t size,
int
rte_eth_dev_release_port(struct rte_eth_dev *eth_dev)
{
+
if (eth_dev == NULL)
return -EINVAL;
@@ -418,9 +479,7 @@ rte_eth_dev_get_name_by_port(uint8_t port_id, char *name)
return -EINVAL;
}
- /* shouldn't check 'rte_eth_devices[i].data',
- * because it might be overwritten by VDEV PMD */
- tmp = rte_eth_dev_data[port_id].name;
+ tmp = rte_eth_devices[port_id].data->name;
strcpy(name, tmp);
return 0;
}
@@ -439,9 +498,7 @@ rte_eth_dev_get_port_by_name(const char *name, uint8_t *port_id)
for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
- if (!strncmp(name,
- rte_eth_dev_data[i].name, strlen(name))) {
-
+ if (!strncmp(name, rte_eth_devices[i].data->name, strlen(name))) {
*port_id = i;
return 0;
@@ -632,6 +689,8 @@ int
rte_eth_dev_detach(uint8_t port_id, char *name)
{
struct rte_pci_addr addr;
+ struct rte_eth_dev_data *eth_dev_data = NULL;
+ char device[RTE_ETH_NAME_MAX_LEN];
int ret = -1;
if (name == NULL) {
@@ -643,6 +702,15 @@ rte_eth_dev_detach(uint8_t port_id, char *name)
if (rte_eth_dev_is_detachable(port_id))
goto err;
+ /* get device name by port id */
+ if (rte_eth_dev_get_name_by_port(port_id, device))
+ goto err;
+
+ /* look for an entry in the shared device data */
+ eth_dev_data = rte_eth_dev_data_shared_allocated(device);
+ if (eth_dev_data == NULL)
+ goto err;
+
if (rte_eth_dev_get_device_type(port_id) == RTE_ETH_DEV_PCI) {
ret = rte_eth_dev_get_addr_by_port(port_id, &addr);
if (ret < 0)
@@ -662,6 +730,9 @@ rte_eth_dev_detach(uint8_t port_id, char *name)
goto err;
}
+ /* clear an entry in the shared device data */
+ memset(eth_dev_data, 0, sizeof(struct rte_eth_dev_data));
+
return 0;
err:
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index b0fe033..9de231b 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -1748,6 +1748,29 @@ struct rte_eth_dev *rte_eth_dev_allocated(const char *name);
/**
* @internal
+ * Returns a shared ethdev slot specified by the unique identifier name.
+ *
+ * @param name
+ * The pointer to the Unique identifier name for each shared Ethernet device
+ * between multiple processes.
+ * @return
+ * - The pointer to the shared ethdev slot, on success. NULL on error
+ */
+struct rte_eth_dev_data *rte_eth_dev_data_shared_allocated(const char *name);
+
+/**
+ * @internal
+ * Release device data kept in a common memory for all processes.
+ *
+ * @param port_id
+ * The port identifier of the device to release device data.
+ * @return
+ * - 0 on success, negative on error
+ */
+int rte_eth_dev_release_dev_data(uint8_t port_id);
+
+/**
+ * @internal
* Allocates a new ethdev slot for an ethernet device and returns the pointer
* to that slot for the driver to use.
*
diff --git a/lib/librte_ether/rte_ether_version.map b/lib/librte_ether/rte_ether_version.map
index 45ddf44..25ae80d 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -139,3 +139,10 @@ DPDK_16.07 {
rte_eth_dev_get_port_by_name;
rte_eth_xstats_get_names;
} DPDK_16.04;
+
+DPDK_16.11 {
+ global:
+
+ rte_eth_dev_data_shared_allocated;
+ rte_eth_dev_release_dev_data;
+} DPDK_16.07
--
1.9.1
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