[v3,2/2] net/tap: fix to populate fds in secondary process
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Commit Message
From: Kumara Parameshwaran <kparameshwar@vmware.com>
When a tap device is hotplugged to primary process which in turn
adds the device to all secondary process, the secondary process
does a tap_mp_attach_queues, but the fds are not populated in
the primary during the probe they are populated during the queue_setup,
added a fix to sync the queues during rte_eth_dev_start
Fixes: 4852aa8f6e21 ("drivers/net: enable hotplug on secondary process")
Cc: stable@dpdk.org
Signed-off-by: Kumara Parameshwaran <kparameshwar@vmware.com>
---
v3:
* Retain tap_sync_queues to retain the attach of secondary process
* Fix coding convention for a function definition
* Renamed rte_get_eth_dev_by_name to rte_eth_dev_get_by_name in sorted
in version.map
* Remove uninteded blank line
drivers/net/tap/rte_eth_tap.c | 80 +++++++++++++++++++++++++++++++++++
1 file changed, 80 insertions(+)
Comments
On 1/31/2022 2:32 PM, Kumara Parameshwaran wrote:
> From: Kumara Parameshwaran<kparameshwar@vmware.com>
>
> When a tap device is hotplugged to primary process which in turn
> adds the device to all secondary process, the secondary process
> does a tap_mp_attach_queues, but the fds are not populated in
> the primary during the probe they are populated during the queue_setup,
> added a fix to sync the queues during rte_eth_dev_start
>
> Fixes: 4852aa8f6e21 ("drivers/net: enable hotplug on secondary process")
> Cc:stable@dpdk.org
>
> Signed-off-by: Kumara Parameshwaran<kparameshwar@vmware.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>
@@ -67,6 +67,7 @@
/* IPC key for queue fds sync */
#define TAP_MP_KEY "tap_mp_sync_queues"
+#define TAP_MP_REQ_START_RXTX "tap_mp_req_start_rxtx"
#define TAP_IOV_DEFAULT_MAX 1024
@@ -880,11 +881,49 @@ tap_link_set_up(struct rte_eth_dev *dev)
return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
}
+static int
+tap_mp_req_on_rxtx(struct rte_eth_dev *dev)
+{
+ struct rte_mp_msg msg;
+ struct ipc_queues *request_param = (struct ipc_queues *)msg.param;
+ int err;
+ int fd_iterator = 0;
+ struct pmd_process_private *process_private = dev->process_private;
+ int i;
+
+ memset(&msg, 0, sizeof(msg));
+ strlcpy(msg.name, TAP_MP_REQ_START_RXTX, sizeof(msg.name));
+ strlcpy(request_param->port_name, dev->data->name, sizeof(request_param->port_name));
+ msg.len_param = sizeof(*request_param);
+ for (i = 0; i < dev->data->nb_tx_queues; i++) {
+ msg.fds[fd_iterator++] = process_private->txq_fds[i];
+ msg.num_fds++;
+ request_param->txq_count++;
+ }
+ for (i = 0; i < dev->data->nb_rx_queues; i++) {
+ msg.fds[fd_iterator++] = process_private->rxq_fds[i];
+ msg.num_fds++;
+ request_param->rxq_count++;
+ }
+
+ err = rte_mp_sendmsg(&msg);
+ if (err < 0) {
+ TAP_LOG(ERR, "Failed to send start req to secondary %d",
+ rte_errno);
+ return -1;
+ }
+
+ return 0;
+}
+
static int
tap_dev_start(struct rte_eth_dev *dev)
{
int err, i;
+ if (rte_eal_process_type() == RTE_PROC_PRIMARY)
+ tap_mp_req_on_rxtx(dev);
+
err = tap_intr_handle_set(dev, 1);
if (err)
return err;
@@ -901,6 +940,34 @@ tap_dev_start(struct rte_eth_dev *dev)
return err;
}
+static int
+tap_mp_req_start_rxtx(const struct rte_mp_msg *request, __rte_unused const void *peer)
+{
+ struct rte_eth_dev *dev;
+ const struct ipc_queues *request_param =
+ (const struct ipc_queues *)request->param;
+ int fd_iterator;
+ int queue;
+ struct pmd_process_private *process_private;
+
+ dev = rte_eth_dev_get_by_name(request_param->port_name);
+ if (!dev) {
+ TAP_LOG(ERR, "Failed to get dev for %s",
+ request_param->port_name);
+ return -1;
+ }
+ process_private = dev->process_private;
+ fd_iterator = 0;
+ TAP_LOG(DEBUG, "tap_attach rx_q:%d tx_q:%d\n", request_param->rxq_count,
+ request_param->txq_count);
+ for (queue = 0; queue < request_param->txq_count; queue++)
+ process_private->txq_fds[queue] = request->fds[fd_iterator++];
+ for (queue = 0; queue < request_param->rxq_count; queue++)
+ process_private->rxq_fds[queue] = request->fds[fd_iterator++];
+
+ return 0;
+}
+
/* This function gets called when the current port gets stopped.
*/
static int
@@ -1084,6 +1151,9 @@ tap_dev_close(struct rte_eth_dev *dev)
if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
rte_free(dev->process_private);
+ if (tap_devices_count == 1)
+ rte_mp_action_unregister(TAP_MP_REQ_START_RXTX);
+ tap_devices_count--;
return 0;
}
@@ -2445,6 +2515,16 @@ rte_pmd_tap_probe(struct rte_vdev_device *dev)
ret = tap_mp_attach_queues(name, eth_dev);
if (ret != 0)
return -1;
+
+ if (!tap_devices_count) {
+ ret = rte_mp_action_register(TAP_MP_REQ_START_RXTX, tap_mp_req_start_rxtx);
+ if (ret < 0 && rte_errno != ENOTSUP) {
+ TAP_LOG(ERR, "tap: Failed to register IPC callback: %s",
+ strerror(rte_errno));
+ return -1;
+ }
+ }
+ tap_devices_count++;
rte_eth_dev_probing_finish(eth_dev);
return 0;
}