On Thu, Apr 07, 2016 at 02:33:53AM +0300, Dan Jurgens wrote:
> From: Daniel Jurgens <danielj@xxxxxxxxxxxx>
>
> Cache the subnet prefix and add a function to access it. Enforcing
> security requires frequent queries of the subnet prefix and the pkeys in
> the pkey table.
>
> Signed-off-by: Daniel Jurgens <danielj@xxxxxxxxxxxx>
> Reviewed-by: Eli Cohen <eli@xxxxxxxxxxxx>
> ---
> drivers/infiniband/core/cache.c | 36 ++++++++++++++++++++++++++++++++++-
> drivers/infiniband/core/core_priv.h | 3 ++
> include/rdma/ib_verbs.h | 1 +
> 3 files changed, 39 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
> index cb00d59..83cf528 100644
> --- a/drivers/infiniband/core/cache.c
> +++ b/drivers/infiniband/core/cache.c
> @@ -925,6 +925,26 @@ int ib_get_cached_pkey(struct ib_device *device,
> }
> EXPORT_SYMBOL(ib_get_cached_pkey);
>
> +int ib_get_cached_subnet_prefix(struct ib_device *device,
> + u8 port_num,
> + u64 *sn_pfx)
> +{
> + unsigned long flags;
> + int ret = 0;
It is not needed, just return 0 directly.
> + int p = port_num - rdma_start_port(device);
> +
> + if (port_num < rdma_start_port(device) ||
> + port_num > rdma_end_port(device))
> + return -EINVAL;
> +
> + read_lock_irqsave(&device->cache.lock, flags);
> + *sn_pfx = device->cache.subnet_prefix_cache[p];
> + read_unlock_irqrestore(&device->cache.lock, flags);
> +
> + return ret;
> +}
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