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    Subject[PATCH 5.9 029/757] tipc: re-configure queue limit for broadcast link
    Date
    From: Hoang Huu Le <hoang.h.le@dektech.com.au>

    [ Upstream commit 75cee397ae6f1020fbb75db90aa22a51bc3318ac ]

    The queue limit of the broadcast link is being calculated base on initial
    MTU. However, when MTU value changed (e.g manual changing MTU on NIC
    device, MTU negotiation etc.,) we do not re-calculate queue limit.
    This gives throughput does not reflect with the change.

    So fix it by calling the function to re-calculate queue limit of the
    broadcast link.

    Acked-by: Jon Maloy <jmaloy@redhat.com>
    Signed-off-by: Hoang Huu Le <hoang.h.le@dektech.com.au>
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/tipc/bcast.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    --- a/net/tipc/bcast.c
    +++ b/net/tipc/bcast.c
    @@ -108,6 +108,7 @@ static void tipc_bcbase_select_primary(s
    {
    struct tipc_bc_base *bb = tipc_bc_base(net);
    int all_dests = tipc_link_bc_peers(bb->link);
    + int max_win = tipc_link_max_win(bb->link);
    int i, mtu, prim;

    bb->primary_bearer = INVALID_BEARER_ID;
    @@ -121,8 +122,11 @@ static void tipc_bcbase_select_primary(s
    continue;

    mtu = tipc_bearer_mtu(net, i);
    - if (mtu < tipc_link_mtu(bb->link))
    + if (mtu < tipc_link_mtu(bb->link)) {
    tipc_link_set_mtu(bb->link, mtu);
    + tipc_link_set_queue_limits(bb->link, max_win,
    + max_win);
    + }
    bb->bcast_support &= tipc_bearer_bcast_support(net, i);
    if (bb->dests[i] < all_dests)
    continue;

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