On Fri, Mar 31, 2023 at 01:18:57PM +0530, Sricharan Ramabadhran wrote:
> 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."
>
> Fixes: 0c2204a4ad71 ("net: qrtr: Migrate nameservice to kernel from userspace")
> Signed-off-by: Sricharan Ramabadhran <quic_srichara@xxxxxxxxxxx>
> Signed-off-by: Ram Kumar Dharuman <quic_ramd@xxxxxxxxxxx>
> ---
> [v2] Fixed comments from Manivannan and Jakub Kicinski
> Note: Functionally tested on 5.4 and compile tested on 6.3 TOT
>
> net/qrtr/ns.c | 15 +++++++++------
> 1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/net/qrtr/ns.c b/net/qrtr/ns.c
> index 722936f..0f25a38 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 bcast)
> {
> 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 && bcast)
> 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 +459,13 @@ 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 but don't broadcast
This is still not as per the multi line comment style perferred in kernel.
Please read: https://www.kernel.org/doc/html/latest/process/coding-style.html#commenting
- Mani
> + * DEL_SERVER. Neighbours would've already removed the server belonging
> + * to this port due to the DEL_CLIENT broadcast from qrtr_port_remove().
> + */
> 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 +570,7 @@ 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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