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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>
71 lines
2.5 KiB
C
71 lines
2.5 KiB
C
/*
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* Copyright (c) 2009, 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 RTNETLINK_LINK_H
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#define RTNETLINK_LINK_H 1
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#include <stdbool.h>
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#include <stdint.h>
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#include <linux/if_ether.h>
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#include "openvswitch/types.h"
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struct ofpbuf;
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struct nln_notifier;
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/* These functions are Linux specific, so they should be used directly only by
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* Linux-specific code. */
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/* A digested version of an rtnetlink_link message sent down by the kernel to
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* indicate that a network device's status (link or address) has been changed.
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*/
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struct rtnetlink_change {
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/* Copied from struct nlmsghdr. */
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int nlmsg_type; /* e.g. RTM_NEWLINK, RTM_DELLINK. */
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/* Common attributes. */
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int if_index; /* Index of network device. */
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const char *ifname; /* Name of network device. */
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/* Network device link status. */
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int master_ifindex; /* Ifindex of datapath master (0 if none). */
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int mtu; /* Current MTU. */
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struct eth_addr mac;
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unsigned int ifi_flags; /* Flags of network device. */
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/* Network device address status. */
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/* xxx To be added when needed. */
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};
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/* Function called to report that a netdev has changed. 'change' describes the
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* specific change. It may be null if the buffer of change information
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* overflowed, in which case the function must assume that every device may
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* have changed. 'aux' is as specified in the call to
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* rtnetlink_notifier_register(). */
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typedef
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void rtnetlink_notify_func(const struct rtnetlink_change *change,
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void *aux);
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bool rtnetlink_type_is_rtnlgrp_link(uint16_t type);
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bool rtnetlink_type_is_rtnlgrp_addr(uint16_t type);
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bool rtnetlink_parse(struct ofpbuf *buf, struct rtnetlink_change *change);
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struct nln_notifier *
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rtnetlink_notifier_create(rtnetlink_notify_func *, void *aux);
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void rtnetlink_notifier_destroy(struct nln_notifier *);
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void rtnetlink_run(void);
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void rtnetlink_wait(void);
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#endif /* rtnetlink.h */
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