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    Subject[PATCH AUTOSEL 4.20 55/77] hv_netvsc: Fix ethtool change hash key error
    Date
    From: Haiyang Zhang <haiyangz@microsoft.com>

    [ Upstream commit b4a10c750424e01b5e37372fef0a574ebf7b56c3 ]

    Hyper-V hosts require us to disable RSS before changing RSS key,
    otherwise the changing request will fail. This patch fixes the
    coding error.

    Fixes: ff4a44199012 ("netvsc: allow get/set of RSS indirection table")
    Reported-by: Wei Hu <weh@microsoft.com>
    Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
    Reviewed-by: Michael Kelley <mikelley@microsoft.com>
    [sl: fix up subject line]
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/net/hyperv/rndis_filter.c | 25 +++++++++++++++++++------
    1 file changed, 19 insertions(+), 6 deletions(-)

    diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
    index 8b537a049c1e..a4661d396e3c 100644
    --- a/drivers/net/hyperv/rndis_filter.c
    +++ b/drivers/net/hyperv/rndis_filter.c
    @@ -774,8 +774,8 @@ rndis_filter_set_offload_params(struct net_device *ndev,
    return ret;
    }

    -int rndis_filter_set_rss_param(struct rndis_device *rdev,
    - const u8 *rss_key)
    +static int rndis_set_rss_param_msg(struct rndis_device *rdev,
    + const u8 *rss_key, u16 flag)
    {
    struct net_device *ndev = rdev->ndev;
    struct rndis_request *request;
    @@ -804,7 +804,7 @@ int rndis_filter_set_rss_param(struct rndis_device *rdev,
    rssp->hdr.type = NDIS_OBJECT_TYPE_RSS_PARAMETERS;
    rssp->hdr.rev = NDIS_RECEIVE_SCALE_PARAMETERS_REVISION_2;
    rssp->hdr.size = sizeof(struct ndis_recv_scale_param);
    - rssp->flag = 0;
    + rssp->flag = flag;
    rssp->hashinfo = NDIS_HASH_FUNC_TOEPLITZ | NDIS_HASH_IPV4 |
    NDIS_HASH_TCP_IPV4 | NDIS_HASH_IPV6 |
    NDIS_HASH_TCP_IPV6;
    @@ -829,9 +829,12 @@ int rndis_filter_set_rss_param(struct rndis_device *rdev,

    wait_for_completion(&request->wait_event);
    set_complete = &request->response_msg.msg.set_complete;
    - if (set_complete->status == RNDIS_STATUS_SUCCESS)
    - memcpy(rdev->rss_key, rss_key, NETVSC_HASH_KEYLEN);
    - else {
    + if (set_complete->status == RNDIS_STATUS_SUCCESS) {
    + if (!(flag & NDIS_RSS_PARAM_FLAG_DISABLE_RSS) &&
    + !(flag & NDIS_RSS_PARAM_FLAG_HASH_KEY_UNCHANGED))
    + memcpy(rdev->rss_key, rss_key, NETVSC_HASH_KEYLEN);
    +
    + } else {
    netdev_err(ndev, "Fail to set RSS parameters:0x%x\n",
    set_complete->status);
    ret = -EINVAL;
    @@ -842,6 +845,16 @@ int rndis_filter_set_rss_param(struct rndis_device *rdev,
    return ret;
    }

    +int rndis_filter_set_rss_param(struct rndis_device *rdev,
    + const u8 *rss_key)
    +{
    + /* Disable RSS before change */
    + rndis_set_rss_param_msg(rdev, rss_key,
    + NDIS_RSS_PARAM_FLAG_DISABLE_RSS);
    +
    + return rndis_set_rss_param_msg(rdev, rss_key, 0);
    +}
    +
    static int rndis_filter_query_device_link_status(struct rndis_device *dev,
    struct netvsc_device *net_device)
    {
    --
    2.19.1
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