On Sun, May 18, 2014 at 12:38:47PM +0300, Or Gerlitz wrote:
> struct ibv_ah *__ibv_create_ah(struct ibv_pd *pd, struct ibv_ah_attr *attr)
> {
> - struct ibv_ah *ah = pd->context->ops.create_ah(pd, attr);
> + int err;
> + struct ibv_ah *ah = NULL;
> +#ifndef NRESOLVE_NEIGH
> + struct ibv_port_attr port_attr;
> + int dst_family;
> + int src_family;
> + int oif;
> + struct get_neigh_handler neigh_handler;
> + union ibv_gid sgid;
> + struct ibv_ah_attr_ex attr_ex;
> + int ether_len;
> + struct verbs_context *vctx = verbs_get_ctx_op(pd->context,
> + create_ah_ex);
> + struct peer_address src;
> + struct peer_address dst;
> +
> + if (!vctx) {
> +#endif
> + ah = pd->context->ops.create_ah(pd, attr);
> +#ifndef NRESOLVE_NEIGH
> + goto return_ah;
> + }
> +
> + err = ibv_query_port(pd->context, attr->port_num, &port_attr);
It feels like a regression to force this overhead. Many HCAs have no
possibility to support anything but IB, or Ethernet and don't need
this.
This whole arrangement seems strange. create_ah_ex should be a full
fledged user callable function, not a buried driver entry point.
It is also very unusual for verbs to have all this generic code in
a driver wrapper.
I suspect the answer here is to have the driver call into helper
functions from verbs to do this addressing
work. 'get_ethernet_l2_from_ah' or something.
If you do that then we don't even need create_ah_ex and query_port_ex
- those function seem to only be required to support this wrapper
technique.
So please rethink how this flows.. Maybe wrapping is not the best
choice??
Jason
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