Commit 977750076d98 ("af_packet: add interframe drop cmsg (v6)") unionized skb->mark and skb->dropcount in order to allow recording of the socket drop count while maintaining struct sk_buff size. skb->dropcount was introduced since there was no available room in skb->cb[] in packet sockets. However, its introduction led to the inability to export skb->mark to userspace. It was considered to alias skb->priority instead of skb->mark. However, that would lead to the inabilty to export skb->priority to userspace if desired. Such change may also lead to hard-to-find issues as skb->priority is assumed to be alias free, and, as noted by Shmulik Ladkani, is not 'naturally orthogonal' with other skb fields. This patch series follows the suggestions made by Eric Dumazet moving the dropcount metric to skb->cb[], eliminating this problem at the expense of 4 bytes less in skb->cb[] for protocol families using it. The patch series include compactization of bluetooth and packet use of skb->cb[] as well as the infrastructure for placing dropcount in skb->cb[]. --- Changes in v3: - Rebase - Compact af_packet use of skb->cb[] instead of aliasing skb->dev for creating room per Willem de Bruijn suggestion Changes in v2: - Rebase - Receive const struct sock * in sock_skb_set_dropcount() per Eric Dumazet's suggestion - struct bt_skb_cb compactization code improvements following suggestions from Shmulik Landani and David Laight - Fix incorrect asignment to skb->dev in packet_rcv() --- Eyal Birger (7): net: bluetooth: compact struct bt_skb_cb by inlining struct hci_req_ctrl net: bluetooth: compact struct bt_skb_cb by converting boolean fields to bit fields net: rxrpc: change call to sock_recv_ts_and_drops() on rxrpc recvmsg to sock_recv_timestamp() net: packet: use sockaddr_ll fields as storage for skb original length in recvmsg path net: use common macro for assering skb->cb[] available size in protocol families net: add common accessor for setting dropcount on packets net: move skb->dropcount to skb->cb[] include/linux/skbuff.h | 2 -- include/net/bluetooth/bluetooth.h | 14 +++++--------- include/net/sock.h | 23 +++++++++++++++++++++++ net/bluetooth/af_bluetooth.c | 3 +-- net/bluetooth/hci_core.c | 12 ++++++------ net/bluetooth/hci_event.c | 4 ++-- net/bluetooth/hci_request.c | 6 +++--- net/bluetooth/hci_sock.c | 2 +- net/can/bcm.c | 2 +- net/can/raw.c | 6 +++--- net/core/sock.c | 2 +- net/ipv4/af_inet.c | 2 +- net/ipv4/tcp.c | 3 +-- net/ipv6/af_inet6.c | 2 +- net/packet/af_packet.c | 35 ++++++++++++++++++++++++++--------- net/rxrpc/ar-recvmsg.c | 2 +- net/sctp/protocol.c | 3 +-- net/socket.c | 4 ++-- 18 files changed, 79 insertions(+), 48 deletions(-) -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html