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https://github.com/openvswitch/ovs
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74ff3298c8
Define struct eth_addr and use it instead of a uint8_t array for all ethernet addresses in OVS userspace. The struct is always the right size, and it can be assigned without an explicit memcpy, which makes code more readable. "struct eth_addr" is a good type name for this as many utility functions are already named accordingly. struct eth_addr can be accessed as bytes as well as ovs_be16's, which makes the struct 16-bit aligned. All use seems to be 16-bit aligned, so some algorithms on the ethernet addresses can be made a bit more efficient making use of this fact. As the struct fits into a register (in 64-bit systems) we pass it by value when possible. This patch also changes the few uses of Linux specific ETH_ALEN to OVS's own ETH_ADDR_LEN, and removes the OFP_ETH_ALEN, as it is no longer needed. This work stemmed from a desire to make all struct flow members assignable for unrelated exploration purposes. However, I think this might be a nice code readability improvement by itself. Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
60 lines
2.0 KiB
C
60 lines
2.0 KiB
C
/* Copyright (c) 2013, 2015 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef TUNNEL_H
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#define TUNNEL_H 1
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#include <stdbool.h>
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#include <stdint.h>
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#include "flow.h"
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/* Tunnel port emulation layer.
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*
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* These functions emulate tunnel virtual ports based on the outer
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* header information from the kernel. */
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struct ovs_action_push_tnl;
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struct ofport_dpif;
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struct netdev;
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void ofproto_tunnel_init(void);
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bool tnl_port_reconfigure(const struct ofport_dpif *, const struct netdev *,
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odp_port_t, bool native_tnl, const char name[]);
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int tnl_port_add(const struct ofport_dpif *, const struct netdev *,
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odp_port_t odp_port, bool native_tnl, const char name[]);
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void tnl_port_del(const struct ofport_dpif *);
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const struct ofport_dpif *tnl_port_receive(const struct flow *);
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void tnl_wc_init(struct flow *, struct flow_wildcards *);
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bool tnl_process_ecn(struct flow *);
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odp_port_t tnl_port_send(const struct ofport_dpif *, struct flow *,
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struct flow_wildcards *wc);
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/* Returns true if 'flow' should be submitted to tnl_port_receive(). */
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static inline bool
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tnl_port_should_receive(const struct flow *flow)
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{
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return flow->tunnel.ip_dst != 0;
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}
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int tnl_port_build_header(const struct ofport_dpif *ofport,
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const struct flow *tnl_flow,
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const struct eth_addr dmac,
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const struct eth_addr smac,
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ovs_be32 ip_src, struct ovs_action_push_tnl *data);
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#endif /* tunnel.h */
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