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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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93f154b594
One point of contention in high network loads is the dst_release() performed
when a transmited skb is freed. This is because NIC tx completion calls
dev_kree_skb() long after original call to dev_queue_xmit(skb).
CPU cache is cold and the atomic op in dst_release() stalls. On SMP, this is
quite visible if one CPU is 100% handling softirqs for a network device,
since dst_clone() is done by other cpus, involving cache line ping pongs.
It seems right place to release dst is in dev_hard_start_xmit(), for most
devices but ones that are virtual, and some exceptions.
David Miller suggested to define a new device flag, set in alloc_netdev_mq()
(so that most devices set it at init time), and carefuly unset in devices
which dont want a NULL skb->dst in their ndo_start_xmit().
List of devices that must clear this flag is :
- loopback device, because it calls netif_rx() and quoting Patrick :
"ip_route_input() doesn't accept loopback addresses, so loopback packets
already need to have a dst_entry attached."
- appletalk/ipddp.c : needs skb->dst in its xmit function
- And all devices that call again dev_queue_xmit() from their xmit function
(as some classifiers need skb->dst) : bonding, vlan, macvlan, eql, ifb, hdlc_fr
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
227 lines
7.8 KiB
C
227 lines
7.8 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Global definitions for the INET interface module.
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*
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* Version: @(#)if.h 1.0.2 04/18/93
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*
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* Authors: Original taken from Berkeley UNIX 4.3, (c) UCB 1982-1988
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* Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_IF_H
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#define _LINUX_IF_H
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#include <linux/types.h> /* for "__kernel_caddr_t" et al */
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#include <linux/socket.h> /* for "struct sockaddr" et al */
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#include <linux/compiler.h> /* for "__user" et al */
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#define IFNAMSIZ 16
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#define IFALIASZ 256
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#include <linux/hdlc/ioctl.h>
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/* Standard interface flags (netdevice->flags). */
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#define IFF_UP 0x1 /* interface is up */
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#define IFF_BROADCAST 0x2 /* broadcast address valid */
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#define IFF_DEBUG 0x4 /* turn on debugging */
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#define IFF_LOOPBACK 0x8 /* is a loopback net */
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#define IFF_POINTOPOINT 0x10 /* interface is has p-p link */
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#define IFF_NOTRAILERS 0x20 /* avoid use of trailers */
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#define IFF_RUNNING 0x40 /* interface RFC2863 OPER_UP */
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#define IFF_NOARP 0x80 /* no ARP protocol */
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#define IFF_PROMISC 0x100 /* receive all packets */
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#define IFF_ALLMULTI 0x200 /* receive all multicast packets*/
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#define IFF_MASTER 0x400 /* master of a load balancer */
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#define IFF_SLAVE 0x800 /* slave of a load balancer */
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#define IFF_MULTICAST 0x1000 /* Supports multicast */
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#define IFF_PORTSEL 0x2000 /* can set media type */
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#define IFF_AUTOMEDIA 0x4000 /* auto media select active */
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#define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses*/
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#define IFF_LOWER_UP 0x10000 /* driver signals L1 up */
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#define IFF_DORMANT 0x20000 /* driver signals dormant */
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#define IFF_ECHO 0x40000 /* echo sent packets */
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#define IFF_VOLATILE (IFF_LOOPBACK|IFF_POINTOPOINT|IFF_BROADCAST|IFF_ECHO|\
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IFF_MASTER|IFF_SLAVE|IFF_RUNNING|IFF_LOWER_UP|IFF_DORMANT)
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/* Private (from user) interface flags (netdevice->priv_flags). */
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#define IFF_802_1Q_VLAN 0x1 /* 802.1Q VLAN device. */
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#define IFF_EBRIDGE 0x2 /* Ethernet bridging device. */
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#define IFF_SLAVE_INACTIVE 0x4 /* bonding slave not the curr. active */
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#define IFF_MASTER_8023AD 0x8 /* bonding master, 802.3ad. */
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#define IFF_MASTER_ALB 0x10 /* bonding master, balance-alb. */
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#define IFF_BONDING 0x20 /* bonding master or slave */
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#define IFF_SLAVE_NEEDARP 0x40 /* need ARPs for validation */
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#define IFF_ISATAP 0x80 /* ISATAP interface (RFC4214) */
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#define IFF_MASTER_ARPMON 0x100 /* bonding master, ARP mon in use */
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#define IFF_WAN_HDLC 0x200 /* WAN HDLC device */
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#define IFF_XMIT_DST_RELEASE 0x400 /* dev_hard_start_xmit() is allowed to
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* release skb->dst
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*/
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#define IF_GET_IFACE 0x0001 /* for querying only */
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#define IF_GET_PROTO 0x0002
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/* For definitions see hdlc.h */
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#define IF_IFACE_V35 0x1000 /* V.35 serial interface */
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#define IF_IFACE_V24 0x1001 /* V.24 serial interface */
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#define IF_IFACE_X21 0x1002 /* X.21 serial interface */
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#define IF_IFACE_T1 0x1003 /* T1 telco serial interface */
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#define IF_IFACE_E1 0x1004 /* E1 telco serial interface */
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#define IF_IFACE_SYNC_SERIAL 0x1005 /* can't be set by software */
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#define IF_IFACE_X21D 0x1006 /* X.21 Dual Clocking (FarSite) */
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/* For definitions see hdlc.h */
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#define IF_PROTO_HDLC 0x2000 /* raw HDLC protocol */
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#define IF_PROTO_PPP 0x2001 /* PPP protocol */
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#define IF_PROTO_CISCO 0x2002 /* Cisco HDLC protocol */
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#define IF_PROTO_FR 0x2003 /* Frame Relay protocol */
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#define IF_PROTO_FR_ADD_PVC 0x2004 /* Create FR PVC */
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#define IF_PROTO_FR_DEL_PVC 0x2005 /* Delete FR PVC */
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#define IF_PROTO_X25 0x2006 /* X.25 */
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#define IF_PROTO_HDLC_ETH 0x2007 /* raw HDLC, Ethernet emulation */
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#define IF_PROTO_FR_ADD_ETH_PVC 0x2008 /* Create FR Ethernet-bridged PVC */
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#define IF_PROTO_FR_DEL_ETH_PVC 0x2009 /* Delete FR Ethernet-bridged PVC */
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#define IF_PROTO_FR_PVC 0x200A /* for reading PVC status */
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#define IF_PROTO_FR_ETH_PVC 0x200B
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#define IF_PROTO_RAW 0x200C /* RAW Socket */
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/* RFC 2863 operational status */
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enum {
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IF_OPER_UNKNOWN,
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IF_OPER_NOTPRESENT,
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IF_OPER_DOWN,
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IF_OPER_LOWERLAYERDOWN,
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IF_OPER_TESTING,
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IF_OPER_DORMANT,
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IF_OPER_UP,
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};
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/* link modes */
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enum {
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IF_LINK_MODE_DEFAULT,
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IF_LINK_MODE_DORMANT, /* limit upward transition to dormant */
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};
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/*
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* Device mapping structure. I'd just gone off and designed a
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* beautiful scheme using only loadable modules with arguments
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* for driver options and along come the PCMCIA people 8)
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*
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* Ah well. The get() side of this is good for WDSETUP, and it'll
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* be handy for debugging things. The set side is fine for now and
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* being very small might be worth keeping for clean configuration.
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*/
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struct ifmap
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{
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unsigned long mem_start;
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unsigned long mem_end;
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unsigned short base_addr;
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unsigned char irq;
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unsigned char dma;
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unsigned char port;
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/* 3 bytes spare */
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};
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struct if_settings
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{
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unsigned int type; /* Type of physical device or protocol */
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unsigned int size; /* Size of the data allocated by the caller */
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union {
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/* {atm/eth/dsl}_settings anyone ? */
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raw_hdlc_proto __user *raw_hdlc;
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cisco_proto __user *cisco;
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fr_proto __user *fr;
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fr_proto_pvc __user *fr_pvc;
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fr_proto_pvc_info __user *fr_pvc_info;
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/* interface settings */
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sync_serial_settings __user *sync;
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te1_settings __user *te1;
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} ifs_ifsu;
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};
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/*
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* Interface request structure used for socket
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* ioctl's. All interface ioctl's must have parameter
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* definitions which begin with ifr_name. The
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* remainder may be interface specific.
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*/
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struct ifreq
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{
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#define IFHWADDRLEN 6
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union
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{
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char ifrn_name[IFNAMSIZ]; /* if name, e.g. "en0" */
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} ifr_ifrn;
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union {
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struct sockaddr ifru_addr;
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struct sockaddr ifru_dstaddr;
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struct sockaddr ifru_broadaddr;
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struct sockaddr ifru_netmask;
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struct sockaddr ifru_hwaddr;
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short ifru_flags;
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int ifru_ivalue;
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int ifru_mtu;
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struct ifmap ifru_map;
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char ifru_slave[IFNAMSIZ]; /* Just fits the size */
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char ifru_newname[IFNAMSIZ];
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void __user * ifru_data;
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struct if_settings ifru_settings;
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} ifr_ifru;
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};
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#define ifr_name ifr_ifrn.ifrn_name /* interface name */
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#define ifr_hwaddr ifr_ifru.ifru_hwaddr /* MAC address */
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#define ifr_addr ifr_ifru.ifru_addr /* address */
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#define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-p lnk */
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#define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */
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#define ifr_netmask ifr_ifru.ifru_netmask /* interface net mask */
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#define ifr_flags ifr_ifru.ifru_flags /* flags */
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#define ifr_metric ifr_ifru.ifru_ivalue /* metric */
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#define ifr_mtu ifr_ifru.ifru_mtu /* mtu */
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#define ifr_map ifr_ifru.ifru_map /* device map */
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#define ifr_slave ifr_ifru.ifru_slave /* slave device */
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#define ifr_data ifr_ifru.ifru_data /* for use by interface */
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#define ifr_ifindex ifr_ifru.ifru_ivalue /* interface index */
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#define ifr_bandwidth ifr_ifru.ifru_ivalue /* link bandwidth */
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#define ifr_qlen ifr_ifru.ifru_ivalue /* Queue length */
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#define ifr_newname ifr_ifru.ifru_newname /* New name */
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#define ifr_settings ifr_ifru.ifru_settings /* Device/proto settings*/
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/*
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* Structure used in SIOCGIFCONF request.
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* Used to retrieve interface configuration
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* for machine (useful for programs which
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* must know all networks accessible).
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*/
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struct ifconf
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{
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int ifc_len; /* size of buffer */
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union
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{
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char __user *ifcu_buf;
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struct ifreq __user *ifcu_req;
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} ifc_ifcu;
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};
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#define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */
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#define ifc_req ifc_ifcu.ifcu_req /* array of structures */
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#endif /* _LINUX_IF_H */
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