On Wed, Mar 29, 2023 at 06:37:30PM +0530, Sricharan R wrote:
> When the qrtr socket is released, qrtr_port_remove gets called, which
> broadcasts a DEL_CLIENT. After this DEL_SERVER is also additionally
> broadcasted, which becomes NOP, but triggers the below error msg.
>
> "failed while handling packet from 2:-2", since remote node already
> acted upon on receiving the DEL_CLIENT, once again when it receives
> the DEL_SERVER, it returns -ENOENT.
>
> Fixing it by not sending a 'DEL_SERVER' to remote when a 'DEL_CLIENT'
> was sent for that port.
>
How about:
"On the remote side, when QRTR socket is removed, af_qrtr will call
qrtr_port_remove() which broadcasts the DEL_CLIENT packet to all neighbours
including local NS. NS upon receiving the DEL_CLIENT packet, will remove
the lookups associated with the node:port and broadcasts the DEL_SERVER
packet.
But on the host side, due to the arrival of the DEL_CLIENT packet, the NS
would've already deleted the server belonging to that port. So when the
remote's NS again broadcasts the DEL_SERVER for that port, it throws below
error message on the host:
"failed while handling packet from 2:-2"
So fix this error by not broadcasting the DEL_SERVER packet when the
DEL_CLIENT packet gets processed."
> Signed-off-by: Ram Kumar D <quic_ramd@xxxxxxxxxxx>
> Signed-off-by: Sricharan R <quic_srichara@xxxxxxxxxxx>
> ---
> Note: Functionally tested on 5.4 kernel and compile tested on 6.3 TOT
>
> net/qrtr/ns.c | 16 ++++++++++------
> 1 file changed, 10 insertions(+), 6 deletions(-)
>
> diff --git a/net/qrtr/ns.c b/net/qrtr/ns.c
> index 722936f..6fbb195 100644
> --- a/net/qrtr/ns.c
> +++ b/net/qrtr/ns.c
> @@ -274,7 +274,7 @@ static struct qrtr_server *server_add(unsigned int service,
> return NULL;
> }
>
> -static int server_del(struct qrtr_node *node, unsigned int port)
> +static int server_del(struct qrtr_node *node, unsigned int port, bool del_server)
s/bool del_server/bool bcast/g
> {
> struct qrtr_lookup *lookup;
> struct qrtr_server *srv;
> @@ -287,7 +287,7 @@ static int server_del(struct qrtr_node *node, unsigned int port)
> radix_tree_delete(&node->servers, port);
>
> /* Broadcast the removal of local servers */
> - if (srv->node == qrtr_ns.local_node)
> + if (srv->node == qrtr_ns.local_node && del_server)
> service_announce_del(&qrtr_ns.bcast_sq, srv);
>
> /* Announce the service's disappearance to observers */
> @@ -373,7 +373,7 @@ static int ctrl_cmd_bye(struct sockaddr_qrtr *from)
> }
> slot = radix_tree_iter_resume(slot, &iter);
> rcu_read_unlock();
> - server_del(node, srv->port);
> + server_del(node, srv->port, true);
> rcu_read_lock();
> }
> rcu_read_unlock();
> @@ -459,10 +459,14 @@ static int ctrl_cmd_del_client(struct sockaddr_qrtr *from,
> kfree(lookup);
> }
>
> - /* Remove the server belonging to this port */
> + /* Remove the server belonging to this port
> + * Given that DEL_CLIENT is already broadcasted
> + * by port_remove, no need to send DEL_SERVER for
> + * the same port to remote
> + */
/*
* Remove the server belonging to this port but don't broadcast
* DEL_SERVER. Neighbours would've already removed the server belonging
* to this port due to the DEL_CLIENT broadcast from qrtr_port_remove().
*/
- Mani
> node = node_get(node_id);
> if (node)
> - server_del(node, port);
> + server_del(node, port, false);
>
> /* Advertise the removal of this client to all local servers */
> local_node = node_get(qrtr_ns.local_node);
> @@ -567,7 +571,7 @@ static int ctrl_cmd_del_server(struct sockaddr_qrtr *from,
> if (!node)
> return -ENOENT;
>
> - return server_del(node, port);
> + return server_del(node, port, true);
> }
>
> static int ctrl_cmd_new_lookup(struct sockaddr_qrtr *from,
> --
> 2.7.4
>
--
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