On Wed, Jan 15, 2014 at 04:13:24PM +0900, Simon Horman wrote:
> This is an proposed enhancement to
> "Implement OpenFlow support for MPLS, for up to 3 labels."
>
> Signed-off-by: Simon Horman <ho...@verge.net.au>
> ---
> ofproto/ofproto-dpif-xlate.c | 26 +++++++++++++++-----------
> 1 file changed, 15 insertions(+), 11 deletions(-)
>
> diff --git a/ofproto/ofproto-dpif-xlate.c b/ofproto/ofproto-dpif-xlate.c
> index f14f308..57e8978 100644
> --- a/ofproto/ofproto-dpif-xlate.c
> +++ b/ofproto/ofproto-dpif-xlate.c
> @@ -2155,18 +2155,22 @@ compose_mpls_pop_action(struct xlate_ctx *ctx,
> ovs_be16 eth_type)
> struct flow_wildcards *wc = &ctx->xout->wc;
> struct flow *flow = &ctx->xin->flow;
>
> - if (!flow_pop_mpls(flow, eth_type, wc) &&
> - flow_count_mpls_labels(flow, wc) >= 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 on which an "
> - "MPLS pop action can't be performed as it has "
> - "have more MPLS LSEs than the %"PRIuSIZE" "
> - "that can be handled.",
> - ctx->xbridge->name, ARRAY_SIZE(flow->mpls_lse));
> + if (!flow_pop_mpls(flow, eth_type, wc)) {
> + int n = flow_count_mpls_labels(flow, wc);
> + size_t max_stack = MIN(ARRAY_SIZE(flow->mpls_lse),
> + ctx->xbridge->max_mpls_depth);
> + if (n >= max_stack) {
> + 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 on which an "
> + "MPLS pop action can't be performed as it has "
> + "have more MPLS LSEs than the %"PRIuSIZE" "
> + "that can be handled.", ctx->xbridge->name,
> + max_stack);
> + }
> + ctx->exit = true;
> + ofpbuf_clear(&ctx->xout->odp_actions);
I think that this can be simplified to just
if (!flow_pop_mpls(flow, eth_type, wc)
&& flow_count_mpls_labels(flow, wc) >= 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 on which an "
"MPLS pop action can't be performed as it has "
"more MPLS LSEs than the %"PRIuSIZE" "
"that can be handled.", ctx->xbridge->name,
max_stack);
}
ctx->exit = true;
ofpbuf_clear(&ctx->xout->odp_actions);
}
because flow_pop_mpls() is not going to complain based on
max_mpls_depth but only on ARRAY_SIZE(flow->mpls_lse), and I think
that's OK because we should flag anything with more MPLS labels than
max_mpls_depth but fewer than ARRAY_SIZE(flow->mpls_lse) as
ODP_FIT_TOO_LITTLE so that we get to look at every packet. (Actually,
we don't seem to do that, so I'll propose a patch myself.)
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