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    Subject[PATCH 4.10 129/167] RDMA/core: Fix incorrect structure packing for booleans
    Date
    4.10-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>

    commit 55efcfcd7776165b294f8b5cd6e05ca00ec89b7c upstream.

    The RDMA core uses ib_pack() to convert from unpacked CPU structs
    to on-the-wire bitpacked structs.

    This process requires that 1 bit fields are declared as u8 in the
    unpacked struct, otherwise the packing process does not read the
    value properly and the packed result is wired to 0. Several
    places wrongly used int.

    Crucially this means the kernel has never, set reversible
    correctly in the path record request. It has always asked for
    irreversible paths even if the ULP requests otherwise.

    When the kernel is used with a SM that supports this feature, it
    completely breaks communication management if reversible paths are
    not properly requested.

    The only reason this ever worked is because opensm ignores the
    reversible bit.

    Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
    Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
    Signed-off-by: Doug Ledford <dledford@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    include/rdma/ib_sa.h | 6 +++---
    1 file changed, 3 insertions(+), 3 deletions(-)

    --- a/include/rdma/ib_sa.h
    +++ b/include/rdma/ib_sa.h
    @@ -153,12 +153,12 @@ struct ib_sa_path_rec {
    union ib_gid sgid;
    __be16 dlid;
    __be16 slid;
    - int raw_traffic;
    + u8 raw_traffic;
    /* reserved */
    __be32 flow_label;
    u8 hop_limit;
    u8 traffic_class;
    - int reversible;
    + u8 reversible;
    u8 numb_path;
    __be16 pkey;
    __be16 qos_class;
    @@ -220,7 +220,7 @@ struct ib_sa_mcmember_rec {
    u8 hop_limit;
    u8 scope;
    u8 join_state;
    - int proxy_join;
    + u8 proxy_join;
    };

    /* Service Record Component Mask Sec 15.2.5.14 Ver 1.1 */

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