On Thu, Jan 16, 2014 at 04:10:43PM -0800, Ben Pfaff wrote:
> On Wed, Jan 15, 2014 at 04:13:23PM +0900, Simon Horman wrote:
> > This is an proposed enhancement to
> > "Implement OpenFlow support for MPLS, for up to 3 labels."
> >
> > This makes the conservative assumption that the datapath should
> > not be asked to apply MPLS push actions such that the resulting
> > packet will have an MPLS label stack depth greater than the
> > datapath can accept in a match.
> >
> > In future it may be possible to use recirculation to handle
> > such cases.
> >
> > Signed-off-by: Simon Horman <ho...@verge.net.au>
>
> I think that we can handle these in userspace with SLOW_ACTION, so I
> changed this patch to just the following:
Does this approach work in the case where
n < ctx->xbridge->max_mpls_depth && n >= ARRAY_SIZE(flow->mpls_lse) ?
>
> diff --git a/ofproto/ofproto-dpif-xlate.c b/ofproto/ofproto-dpif-xlate.c
> index 28079be..017074e 100644
> --- a/ofproto/ofproto-dpif-xlate.c
> +++ b/ofproto/ofproto-dpif-xlate.c
> @@ -51,6 +51,7 @@
>
> COVERAGE_DEFINE(xlate_actions);
> COVERAGE_DEFINE(xlate_actions_oversize);
> +COVERAGE_DEFINE(xlate_actions_mpls_overflow);
>
> VLOG_DEFINE_THIS_MODULE(ofproto_dpif_xlate);
>
> @@ -2127,17 +2128,9 @@ compose_mpls_push_action(struct xlate_ctx *ctx, struct
> ofpact_push_mpls *mpls)
> ctx->xout->slow |= commit_odp_actions(flow, &ctx->base_flow,
> &ctx->xout->odp_actions,
> &ctx->xout->wc);
> - } else if (n >= ARRAY_SIZE(flow->mpls_lse)) {
> - if (ctx->xin->packet != NULL) {
> - static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
> - VLOG_WARN_RL(&rl, "bridge %s: dropping packet which after an "
> - "MPLS push action will have more MPLS LSEs than "
> - "the %"PRIuSIZE" that can be handled.",
> - ctx->xbridge->name, ARRAY_SIZE(flow->mpls_lse));
> - }
> - ctx->exit = true;
> - ofpbuf_clear(&ctx->xout->odp_actions);
> - return;
> + } else if (n >= ctx->xbridge->max_mpls_depth) {
> + COVERAGE_INC(xlate_actions_mpls_overflow);
> + ctx->xout->slow |= SLOW_ACTION;
> }
>
> flow_push_mpls(flow, mpls->ethertype, wc);
>
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