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learning-switch: Break packet-in processing into two steps.

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This commit is contained in:
Ben Pfaff
2010-07-20 11:10:45 -07:00
parent 52f4c6fa0d
commit 81f3cad4d3
2 changed files with 81 additions and 74 deletions
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118
lib/learning-switch.c
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@@ -392,12 +392,57 @@ process_switch_features(struct lswitch *sw, struct rconn *rconn, void *osf_)
}
}
static uint16_t
lswitch_choose_destination(struct lswitch *sw, const flow_t *flow)
{
uint16_t out_port;
/* Learn the source MAC. */
if (may_learn(sw, flow->in_port) && sw->ml) {
if (mac_learning_learn(sw->ml, flow->dl_src, 0, flow->in_port,
GRAT_ARP_LOCK_NONE)) {
VLOG_DBG_RL(&rl, "%016llx: learned that "ETH_ADDR_FMT" is on "
"port %"PRIu16, sw->datapath_id,
ETH_ADDR_ARGS(flow->dl_src), flow->in_port);
}
}
/* Drop frames for reserved multicast addresses. */
if (eth_addr_is_reserved(flow->dl_dst)) {
return OFPP_NONE;
}
if (!may_recv(sw, flow->in_port, false)) {
/* STP prevents receiving anything on this port. */
return OFPP_NONE;
}
out_port = OFPP_FLOOD;
if (sw->ml) {
int learned_port = mac_learning_lookup(sw->ml, flow->dl_dst, 0, NULL);
if (learned_port >= 0 && may_send(sw, learned_port)) {
out_port = learned_port;
if (out_port == flow->in_port) {
/* Don't send a packet back out its input port. */
return OFPP_NONE;
}
}
}
/* Check if we need to use "NORMAL" action. */
if (sw->action_normal && out_port != OFPP_FLOOD) {
return OFPP_NORMAL;
}
return out_port;
}
static void
process_packet_in(struct lswitch *sw, struct rconn *rconn, void *opi_)
{
struct ofp_packet_in *opi = opi_;
uint16_t in_port = ntohs(opi->in_port);
uint16_t out_port = OFPP_FLOOD;
uint16_t out_port;
size_t pkt_ofs, pkt_len;
struct ofpbuf pkt;
@@ -410,44 +455,14 @@ process_packet_in(struct lswitch *sw, struct rconn *rconn, void *opi_)
pkt.size = pkt_len;
flow_extract(&pkt, 0, in_port, &flow);
if (may_learn(sw, in_port) && sw->ml) {
if (mac_learning_learn(sw->ml, flow.dl_src, 0, in_port,
GRAT_ARP_LOCK_NONE)) {
VLOG_DBG_RL(&rl, "%016llx: learned that "ETH_ADDR_FMT" is on "
"port %"PRIu16, sw->datapath_id,
ETH_ADDR_ARGS(flow.dl_src), in_port);
}
}
/* Choose output port. */
out_port = lswitch_choose_destination(sw, &flow);
/* Drop frames for reserved multicast addresses. */
if (eth_addr_is_reserved(flow.dl_dst)) {
goto drop_it;
}
if (!may_recv(sw, in_port, false)) {
/* STP prevents receiving anything on this port. */
goto drop_it;
}
if (sw->ml) {
int learned_port = mac_learning_lookup(sw->ml, flow.dl_dst, 0, NULL);
if (learned_port >= 0 && may_send(sw, learned_port)) {
out_port = learned_port;
}
}
if (in_port == out_port) {
/* Don't send out packets on their input ports. */
goto drop_it;
} else if (sw->max_idle >= 0 && (!sw->ml || out_port != OFPP_FLOOD)) {
/* Send the packet, and possibly the whole flow, to the output port. */
if (sw->max_idle >= 0 && (!sw->ml || out_port != OFPP_FLOOD)) {
struct ofpbuf *buffer;
struct ofp_flow_mod *ofm;
/* Check if we need to use "NORMAL" action. */
if (sw->action_normal && out_port != OFPP_FLOOD) {
out_port = OFPP_NORMAL;
}
/* The output port is known, or we always flood everything, so add a
* new flow. */
buffer = make_add_simple_flow(&flow, ntohl(opi->buffer_id),
@@ -457,41 +472,24 @@ process_packet_in(struct lswitch *sw, struct rconn *rconn, void *opi_)
queue_tx(sw, rconn, buffer);
/* If the switch didn't buffer the packet, we need to send a copy. */
if (ntohl(opi->buffer_id) == UINT32_MAX) {
if (ntohl(opi->buffer_id) == UINT32_MAX && out_port != OFPP_NONE) {
queue_tx(sw, rconn,
make_unbuffered_packet_out(&pkt, in_port, out_port));
}
} else {
struct ofpbuf *b;
/* Check if we need to use "NORMAL" action. */
if (sw->action_normal && out_port != OFPP_FLOOD) {
out_port = OFPP_NORMAL;
}
/* We don't know that MAC, or we don't set up flows. Send along the
* packet without setting up a flow. */
if (ntohl(opi->buffer_id) == UINT32_MAX) {
b = make_unbuffered_packet_out(&pkt, in_port, out_port);
if (out_port != OFPP_NONE) {
queue_tx(sw, rconn,
make_unbuffered_packet_out(&pkt, in_port, out_port));
}
} else {
b = make_buffered_packet_out(ntohl(opi->buffer_id),
in_port, out_port);
queue_tx(sw, rconn,
make_buffered_packet_out(ntohl(opi->buffer_id),
in_port, out_port));
}
queue_tx(sw, rconn, b);
}
return;
drop_it:
if (sw->max_idle >= 0) {
/* Set up a flow to drop packets. */
queue_tx(sw, rconn, make_add_flow(&flow, ntohl(opi->buffer_id),
sw->max_idle, 0));
} else {
/* Just drop the packet, since we don't set up flows at all.
* XXX we should send a packet_out with no actions if buffer_id !=
* UINT32_MAX, to avoid clogging the kernel buffers. */
}
return;
}
static void