Provide a way for the application (e.g. the afs filesystem) to store private data on the rxrpc_peer structs for later retrieval via the call object. This will allow afs to store a pointer to the afs_server object on the rxrpc_peer struct, thereby obviating the need for afs to keep lookup tables by which it can associate an incoming call with server that transmitted it. Signed-off-by: David Howells <dhowells@xxxxxxxxxx> cc: Marc Dionne <marc.dionne@xxxxxxxxxxxx> cc: Jakub Kicinski <kuba@xxxxxxxxxx> cc: "David S. Miller" <davem@xxxxxxxxxxxxx> cc: Eric Dumazet <edumazet@xxxxxxxxxx> cc: Paolo Abeni <pabeni@xxxxxxxxxx> cc: Simon Horman <horms@xxxxxxxxxx> cc: linux-afs@xxxxxxxxxxxxxxxxxxx cc: linux-fsdevel@xxxxxxxxxxxxxxx cc: netdev@xxxxxxxxxxxxxxx Link: https://lore.kernel.org/r/20250224234154.2014840-13-dhowells@xxxxxxxxxx/ # v1 --- include/net/af_rxrpc.h | 2 ++ net/rxrpc/ar-internal.h | 1 + net/rxrpc/peer_object.c | 26 ++++++++++++++++++++++++++ 3 files changed, 29 insertions(+) diff --git a/include/net/af_rxrpc.h b/include/net/af_rxrpc.h index 0754c463224a..cf793d18e5df 100644 --- a/include/net/af_rxrpc.h +++ b/include/net/af_rxrpc.h @@ -69,6 +69,8 @@ struct rxrpc_peer *rxrpc_kernel_get_peer(struct rxrpc_peer *peer); struct rxrpc_peer *rxrpc_kernel_get_call_peer(struct socket *sock, struct rxrpc_call *call); const struct sockaddr_rxrpc *rxrpc_kernel_remote_srx(const struct rxrpc_peer *peer); const struct sockaddr *rxrpc_kernel_remote_addr(const struct rxrpc_peer *peer); +unsigned long rxrpc_kernel_set_peer_data(struct rxrpc_peer *peer, unsigned long app_data); +unsigned long rxrpc_kernel_get_peer_data(const struct rxrpc_peer *peer); unsigned int rxrpc_kernel_get_srtt(const struct rxrpc_peer *); int rxrpc_kernel_charge_accept(struct socket *, rxrpc_notify_rx_t, rxrpc_user_attach_call_t, unsigned long, gfp_t, diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h index a64a0cab1bf7..3cc3af15086f 100644 --- a/net/rxrpc/ar-internal.h +++ b/net/rxrpc/ar-internal.h @@ -344,6 +344,7 @@ struct rxrpc_peer { struct hlist_head error_targets; /* targets for net error distribution */ struct rb_root service_conns; /* Service connections */ struct list_head keepalive_link; /* Link in net->peer_keepalive[] */ + unsigned long app_data; /* Application data (e.g. afs_server) */ time64_t last_tx_at; /* Last time packet sent here */ seqlock_t service_conn_lock; spinlock_t lock; /* access lock */ diff --git a/net/rxrpc/peer_object.c b/net/rxrpc/peer_object.c index 56e09d161a97..a0c0e4d590f5 100644 --- a/net/rxrpc/peer_object.c +++ b/net/rxrpc/peer_object.c @@ -520,3 +520,29 @@ const struct sockaddr *rxrpc_kernel_remote_addr(const struct rxrpc_peer *peer) (peer ? &peer->srx.transport : &rxrpc_null_addr.transport); } EXPORT_SYMBOL(rxrpc_kernel_remote_addr); + +/** + * rxrpc_kernel_set_peer_data - Set app-specific data on a peer. + * @peer: The peer to alter + * @app_data: The data to set + * + * Set the app-specific data on a peer. AF_RXRPC makes no effort to retain + * anything the data might refer to. The previous app_data is returned. + */ +unsigned long rxrpc_kernel_set_peer_data(struct rxrpc_peer *peer, unsigned long app_data) +{ + return xchg(&peer->app_data, app_data); +} +EXPORT_SYMBOL(rxrpc_kernel_set_peer_data); + +/** + * rxrpc_kernel_get_peer_data - Get app-specific data from a peer. + * @peer: The peer to query + * + * Retrieve the app-specific data from a peer. + */ +unsigned long rxrpc_kernel_get_peer_data(const struct rxrpc_peer *peer) +{ + return peer->app_data; +} +EXPORT_SYMBOL(rxrpc_kernel_get_peer_data);
