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freebsd-skq/sys/net/if_vxlan.h
np 0c30c36e76 if_vxlan(4): add support for hardware assisted checksumming, TSO, and RSS. 
This lets a VXLAN pseudo-interface take advantage of hardware checksumming (tx
and rx), TSO, and RSS if the NIC is capable of performing these operations on
inner VXLAN traffic.

A VXLAN interface inherits the capabilities of its vxlandev interface if one is
specified or of the interface that hosts the vxlanlocal address. If other
interfaces will carry traffic for that VXLAN then they must have the same
hardware capabilities.

On transmit, if_vxlan verifies that the outbound interface has the required
capabilities and then translates the CSUM_ flags to their inner equivalents.
This tells the hardware ifnet that it needs to operate on the inner frame and
not the outer VXLAN headers.

An event is generated when a VXLAN ifnet starts. This allows hardware drivers to
configure their devices to expect VXLAN traffic on the specified incoming port.

On receive, the hardware does RSS and checksum verification on the inner frame.
if_vxlan now does a direct netisr dispatch to take full advantage of RSS. It is
not very clear why it didn't do this already.

Future work:
Rx: it should be possible to avoid the first trip up the protocol stack to get
the frame to if_vxlan just so it can decapsulate and requeue for a second trip
up the stack. The hardware NIC driver could directly call an if_vxlan receive
routine for VXLAN traffic instead.

Rx: LRO. depends on what happens with the previous item. There will have to to
be a mechanism to indicate that it's time for if_vxlan to flush its LRO state.

Reviewed by:	kib@
Relnotes:	Yes
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D25873
2020-09-18 02:37:57 +00:00

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/*-
* Copyright (c) 2014, Bryan Venteicher <bryanv@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _NET_IF_VXLAN_H_
#define _NET_IF_VXLAN_H_
#include <sys/types.h>
#include <sys/socket.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netinet/in.h>
struct vxlan_header {
uint32_t vxlh_flags;
uint32_t vxlh_vni;
};
#define VXLAN_HDR_FLAGS_VALID_VNI 0x08000000
#define VXLAN_HDR_VNI_SHIFT 8
#define VXLAN_VNI_MAX (1 << 24)
#define VXLAN_VNI_MASK (VXLAN_VNI_MAX - 1)
/*
* The port assigned by IANA is 4789, but some early implementations
* (like Linux) use 8472 instead. If not specified, we default to
* the IANA port.
*/
#define VXLAN_PORT 4789
#define VXLAN_LEGACY_PORT 8472
union vxlan_sockaddr {
struct sockaddr sa;
struct sockaddr_in in4;
struct sockaddr_in6 in6;
};
struct ifvxlanparam {
uint64_t vxlp_with;
#define VXLAN_PARAM_WITH_VNI 0x0001
#define VXLAN_PARAM_WITH_LOCAL_ADDR4 0x0002
#define VXLAN_PARAM_WITH_LOCAL_ADDR6 0x0004
#define VXLAN_PARAM_WITH_REMOTE_ADDR4 0x0008
#define VXLAN_PARAM_WITH_REMOTE_ADDR6 0x0010
#define VXLAN_PARAM_WITH_LOCAL_PORT 0x0020
#define VXLAN_PARAM_WITH_REMOTE_PORT 0x0040
#define VXLAN_PARAM_WITH_PORT_RANGE 0x0080
#define VXLAN_PARAM_WITH_FTABLE_TIMEOUT 0x0100
#define VXLAN_PARAM_WITH_FTABLE_MAX 0x0200
#define VXLAN_PARAM_WITH_MULTICAST_IF 0x0400
#define VXLAN_PARAM_WITH_TTL 0x0800
#define VXLAN_PARAM_WITH_LEARN 0x1000
uint32_t vxlp_vni;
union vxlan_sockaddr vxlp_local_sa;
union vxlan_sockaddr vxlp_remote_sa;
uint16_t vxlp_local_port;
uint16_t vxlp_remote_port;
uint16_t vxlp_min_port;
uint16_t vxlp_max_port;
char vxlp_mc_ifname[IFNAMSIZ];
uint32_t vxlp_ftable_timeout;
uint32_t vxlp_ftable_max;
uint8_t vxlp_ttl;
uint8_t vxlp_learn;
};
#define VXLAN_SOCKADDR_IS_IPV4(_vxsin) ((_vxsin)->sa.sa_family == AF_INET)
#define VXLAN_SOCKADDR_IS_IPV6(_vxsin) ((_vxsin)->sa.sa_family == AF_INET6)
#define VXLAN_SOCKADDR_IS_IPV46(_vxsin) \
(VXLAN_SOCKADDR_IS_IPV4(_vxsin) || VXLAN_SOCKADDR_IS_IPV6(_vxsin))
#define VXLAN_CMD_GET_CONFIG 0
#define VXLAN_CMD_SET_VNI 1
#define VXLAN_CMD_SET_LOCAL_ADDR 2
#define VXLAN_CMD_SET_REMOTE_ADDR 4
#define VXLAN_CMD_SET_LOCAL_PORT 5
#define VXLAN_CMD_SET_REMOTE_PORT 6
#define VXLAN_CMD_SET_PORT_RANGE 7
#define VXLAN_CMD_SET_FTABLE_TIMEOUT 8
#define VXLAN_CMD_SET_FTABLE_MAX 9
#define VXLAN_CMD_SET_MULTICAST_IF 10
#define VXLAN_CMD_SET_TTL 11
#define VXLAN_CMD_SET_LEARN 12
#define VXLAN_CMD_FTABLE_ENTRY_ADD 13
#define VXLAN_CMD_FTABLE_ENTRY_REM 14
#define VXLAN_CMD_FLUSH 15
struct ifvxlancfg {
uint32_t vxlc_vni;
union vxlan_sockaddr vxlc_local_sa;
union vxlan_sockaddr vxlc_remote_sa;
uint32_t vxlc_mc_ifindex;
uint32_t vxlc_ftable_cnt;
uint32_t vxlc_ftable_max;
uint32_t vxlc_ftable_timeout;
uint16_t vxlc_port_min;
uint16_t vxlc_port_max;
uint8_t vxlc_learn;
uint8_t vxlc_ttl;
};
struct ifvxlancmd {
uint32_t vxlcmd_flags;
#define VXLAN_CMD_FLAG_FLUSH_ALL 0x0001
#define VXLAN_CMD_FLAG_LEARN 0x0002
uint32_t vxlcmd_vni;
uint32_t vxlcmd_ftable_timeout;
uint32_t vxlcmd_ftable_max;
uint16_t vxlcmd_port;
uint16_t vxlcmd_port_min;
uint16_t vxlcmd_port_max;
uint8_t vxlcmd_mac[ETHER_ADDR_LEN];
uint8_t vxlcmd_ttl;
union vxlan_sockaddr vxlcmd_sa;
char vxlcmd_ifname[IFNAMSIZ];
};
#ifdef _KERNEL
typedef void (*vxlan_event_handler_t)(void *, struct ifnet *, sa_family_t,
u_int);
EVENTHANDLER_DECLARE(vxlan_start, vxlan_event_handler_t);
EVENTHANDLER_DECLARE(vxlan_stop, vxlan_event_handler_t);
#endif
#endif /* _NET_IF_VXLAN_H_ */
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