diff options
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/can.txt | 20 | ||||
| -rw-r--r-- | Documentation/networking/filter.txt | 3 | ||||
| -rw-r--r-- | Documentation/networking/igb.txt | 4 | ||||
| -rw-r--r-- | Documentation/networking/ip-sysctl.txt | 49 | ||||
| -rw-r--r-- | Documentation/networking/ipvs-sysctl.txt | 21 | ||||
| -rw-r--r-- | Documentation/networking/ixgb.txt | 12 | ||||
| -rw-r--r-- | Documentation/networking/ixgbe.txt | 14 | ||||
| -rw-r--r-- | Documentation/networking/mpls-sysctl.txt | 20 | ||||
| -rw-r--r-- | Documentation/networking/packet_mmap.txt | 13 | ||||
| -rw-r--r-- | Documentation/networking/pktgen.txt | 62 | ||||
| -rw-r--r-- | Documentation/networking/rds.txt | 9 | ||||
| -rw-r--r-- | Documentation/networking/s2io.txt | 2 | ||||
| -rw-r--r-- | Documentation/networking/scaling.txt | 9 | ||||
| -rw-r--r-- | Documentation/networking/vxge.txt | 2 |
14 files changed, 181 insertions, 59 deletions
diff --git a/Documentation/networking/can.txt b/Documentation/networking/can.txt index 0a2859a..5abad1e 100644 --- a/Documentation/networking/can.txt +++ b/Documentation/networking/can.txt @@ -22,7 +22,8 @@ This file contains 4.1.3 RAW socket option CAN_RAW_LOOPBACK 4.1.4 RAW socket option CAN_RAW_RECV_OWN_MSGS 4.1.5 RAW socket option CAN_RAW_FD_FRAMES - 4.1.6 RAW socket returned message flags + 4.1.6 RAW socket option CAN_RAW_JOIN_FILTERS + 4.1.7 RAW socket returned message flags 4.2 Broadcast Manager protocol sockets (SOCK_DGRAM) 4.2.1 Broadcast Manager operations 4.2.2 Broadcast Manager message flags @@ -601,7 +602,22 @@ solution for a couple of reasons: CAN FD frames by checking if the device maximum transfer unit is CANFD_MTU. The CAN device MTU can be retrieved e.g. with a SIOCGIFMTU ioctl() syscall. - 4.1.6 RAW socket returned message flags + 4.1.6 RAW socket option CAN_RAW_JOIN_FILTERS + + The CAN_RAW socket can set multiple CAN identifier specific filters that + lead to multiple filters in the af_can.c filter processing. These filters + are indenpendent from each other which leads to logical OR'ed filters when + applied (see 4.1.1). + + This socket option joines the given CAN filters in the way that only CAN + frames are passed to user space that matched *all* given CAN filters. The + semantic for the applied filters is therefore changed to a logical AND. + + This is useful especially when the filterset is a combination of filters + where the CAN_INV_FILTER flag is set in order to notch single CAN IDs or + CAN ID ranges from the incoming traffic. + + 4.1.7 RAW socket returned message flags When using recvmsg() call, the msg->msg_flags may contain following flags: diff --git a/Documentation/networking/filter.txt b/Documentation/networking/filter.txt index 9930ecfb..135581f 100644 --- a/Documentation/networking/filter.txt +++ b/Documentation/networking/filter.txt @@ -280,7 +280,8 @@ Possible BPF extensions are shown in the following table: rxhash skb->hash cpu raw_smp_processor_id() vlan_tci skb_vlan_tag_get(skb) - vlan_pr skb_vlan_tag_present(skb) + vlan_avail skb_vlan_tag_present(skb) + vlan_tpid skb->vlan_proto rand prandom_u32() These extensions can also be prefixed with '#'. diff --git a/Documentation/networking/igb.txt b/Documentation/networking/igb.txt index 43d3549..15534fd 100644 --- a/Documentation/networking/igb.txt +++ b/Documentation/networking/igb.txt @@ -42,10 +42,10 @@ Additional Configurations Jumbo Frames ------------ Jumbo Frames support is enabled by changing the MTU to a value larger than - the default of 1500. Use the ifconfig command to increase the MTU size. + the default of 1500. Use the ip command to increase the MTU size. For example: - ifconfig eth<x> mtu 9000 up + ip link set dev eth<x> mtu 9000 This setting is not saved across reboots. diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt index 1b8c964..071fb18 100644 --- a/Documentation/networking/ip-sysctl.txt +++ b/Documentation/networking/ip-sysctl.txt @@ -388,6 +388,16 @@ tcp_mtu_probing - INTEGER 1 - Disabled by default, enabled when an ICMP black hole detected 2 - Always enabled, use initial MSS of tcp_base_mss. +tcp_probe_interval - INTEGER + Controls how often to start TCP Packetization-Layer Path MTU + Discovery reprobe. The default is reprobing every 10 minutes as + per RFC4821. + +tcp_probe_threshold - INTEGER + Controls when TCP Packetization-Layer Path MTU Discovery probing + will stop in respect to the width of search range in bytes. Default + is 8 bytes. + tcp_no_metrics_save - BOOLEAN By default, TCP saves various connection metrics in the route cache when the connection closes, so that connections established in the @@ -1116,11 +1126,23 @@ arp_accept - BOOLEAN gratuitous arp frame, the arp table will be updated regardless if this setting is on or off. +mcast_solicit - INTEGER + The maximum number of multicast probes in INCOMPLETE state, + when the associated hardware address is unknown. Defaults + to 3. + +ucast_solicit - INTEGER + The maximum number of unicast probes in PROBE state, when + the hardware address is being reconfirmed. Defaults to 3. app_solicit - INTEGER The maximum number of probes to send to the user space ARP daemon via netlink before dropping back to multicast probes (see - mcast_solicit). Defaults to 0. + mcast_resolicit). Defaults to 0. + +mcast_resolicit - INTEGER + The maximum number of multicast probes after unicast and + app probes in PROBE state. Defaults to 0. disable_policy - BOOLEAN Disable IPSEC policy (SPD) for this interface @@ -1198,6 +1220,17 @@ anycast_src_echo_reply - BOOLEAN FALSE: disabled Default: FALSE +idgen_delay - INTEGER + Controls the delay in seconds after which time to retry + privacy stable address generation if a DAD conflict is + detected. + Default: 1 (as specified in RFC7217) + +idgen_retries - INTEGER + Controls the number of retries to generate a stable privacy + address if a DAD conflict is detected. + Default: 3 (as specified in RFC7217) + mld_qrv - INTEGER Controls the MLD query robustness variable (see RFC3810 9.1). Default: 2 (as specified by RFC3810 9.1) @@ -1518,6 +1551,20 @@ use_optimistic - BOOLEAN 0: disabled (default) 1: enabled +stable_secret - IPv6 address + This IPv6 address will be used as a secret to generate IPv6 + addresses for link-local addresses and autoconfigured + ones. All addresses generated after setting this secret will + be stable privacy ones by default. This can be changed via the + addrgenmode ip-link. conf/default/stable_secret is used as the + secret for the namespace, the interface specific ones can + overwrite that. Writes to conf/all/stable_secret are refused. + + It is recommended to generate this secret during installation + of a system and keep it stable after that. + + By default the stable secret is unset. + icmp/*: ratelimit - INTEGER Limit the maximal rates for sending ICMPv6 packets. diff --git a/Documentation/networking/ipvs-sysctl.txt b/Documentation/networking/ipvs-sysctl.txt index 7a3c047..3ba7095 100644 --- a/Documentation/networking/ipvs-sysctl.txt +++ b/Documentation/networking/ipvs-sysctl.txt @@ -22,6 +22,27 @@ backup_only - BOOLEAN If set, disable the director function while the server is in backup mode to avoid packet loops for DR/TUN methods. +conn_reuse_mode - INTEGER + 1 - default + + Controls how ipvs will deal with connections that are detected + port reuse. It is a bitmap, with the values being: + + 0: disable any special handling on port reuse. The new + connection will be delivered to the same real server that was + servicing the previous connection. This will effectively + disable expire_nodest_conn. + + bit 1: enable rescheduling of new connections when it is safe. + That is, whenever expire_nodest_conn and for TCP sockets, when + the connection is in TIME_WAIT state (which is only possible if + you use NAT mode). + + bit 2: it is bit 1 plus, for TCP connections, when connections + are in FIN_WAIT state, as this is the last state seen by load + balancer in Direct Routing mode. This bit helps on adding new + real servers to a very busy cluster. + conntrack - BOOLEAN 0 - disabled (default) not 0 - enabled diff --git a/Documentation/networking/ixgb.txt b/Documentation/networking/ixgb.txt index 1e0c045..9b4a10a1 100644 --- a/Documentation/networking/ixgb.txt +++ b/Documentation/networking/ixgb.txt @@ -39,7 +39,7 @@ Channel Bonding documentation can be found in the Linux kernel source: The driver information previously displayed in the /proc filesystem is not supported in this release. Alternatively, you can use ethtool (version 1.6 -or later), lspci, and ifconfig to obtain the same information. +or later), lspci, and iproute2 to obtain the same information. Instructions on updating ethtool can be found in the section "Additional Configurations" later in this document. @@ -90,7 +90,7 @@ select m for "Intel(R) PRO/10GbE support" located at: 3. Assign an IP address to the interface by entering the following, where x is the interface number: - ifconfig ethx <IP_address> + ip addr add ethx <IP_address> 4. Verify that the interface works. Enter the following, where <IP_address> is the IP address for another machine on the same subnet as the interface @@ -177,7 +177,7 @@ NOTE: These changes are only suggestions, and serve as a starting point for tuning your network performance. The changes are made in three major ways, listed in order of greatest effect: -- Use ifconfig to modify the mtu (maximum transmission unit) and the txqueuelen +- Use ip link to modify the mtu (maximum transmission unit) and the txqueuelen parameter. - Use sysctl to modify /proc parameters (essentially kernel tuning) - Use setpci to modify the MMRBC field in PCI-X configuration space to increase @@ -202,7 +202,7 @@ setpci -d 8086:1a48 e6.b=2e # to change as well. # set the txqueuelen # your ixgb adapter should be loaded as eth1 for this to work, change if needed -ifconfig eth1 mtu 9000 txqueuelen 1000 up +ip li set dev eth1 mtu 9000 txqueuelen 1000 up # call the sysctl utility to modify /proc/sys entries sysctl -p ./sysctl_ixgb.conf - END ixgb_perf.sh @@ -297,10 +297,10 @@ Additional Configurations ------------ The driver supports Jumbo Frames for all adapters. Jumbo Frames support is enabled by changing the MTU to a value larger than the default of 1500. - The maximum value for the MTU is 16114. Use the ifconfig command to + The maximum value for the MTU is 16114. Use the ip command to increase the MTU size. For example: - ifconfig ethx mtu 9000 up + ip li set dev ethx mtu 9000 The maximum MTU setting for Jumbo Frames is 16114. This value coincides with the maximum Jumbo Frames size of 16128. diff --git a/Documentation/networking/ixgbe.txt b/Documentation/networking/ixgbe.txt index 0ace6e7..6f0cb57 100644 --- a/Documentation/networking/ixgbe.txt +++ b/Documentation/networking/ixgbe.txt @@ -70,10 +70,10 @@ Avago 1000BASE-T SFP ABCU-5710RZ 82599-based adapters support all passive and active limiting direct attach cables that comply with SFF-8431 v4.1 and SFF-8472 v10.4 specifications. -Laser turns off for SFP+ when ifconfig down +Laser turns off for SFP+ when device is down ------------------------------------------- -"ifconfig down" turns off the laser for 82599-based SFP+ fiber adapters. -"ifconfig up" turns on the laser. +"ip link set down" turns off the laser for 82599-based SFP+ fiber adapters. +"ip link set up" turns on the laser. 82598-BASED ADAPTERS @@ -213,13 +213,13 @@ Additional Configurations ------------ The driver supports Jumbo Frames for all adapters. Jumbo Frames support is enabled by changing the MTU to a value larger than the default of 1500. - The maximum value for the MTU is 16110. Use the ifconfig command to + The maximum value for the MTU is 16110. Use the ip command to increase the MTU size. For example: - ifconfig ethx mtu 9000 up + ip link set dev ethx mtu 9000 - The maximum MTU setting for Jumbo Frames is 16110. This value coincides - with the maximum Jumbo Frames size of 16128. + The maximum MTU setting for Jumbo Frames is 9710. This value coincides + with the maximum Jumbo Frames size of 9728. Generic Receive Offload, aka GRO -------------------------------- diff --git a/Documentation/networking/mpls-sysctl.txt b/Documentation/networking/mpls-sysctl.txt new file mode 100644 index 0000000..639ddf0 --- /dev/null +++ b/Documentation/networking/mpls-sysctl.txt @@ -0,0 +1,20 @@ +/proc/sys/net/mpls/* Variables: + +platform_labels - INTEGER + Number of entries in the platform label table. It is not + possible to configure forwarding for label values equal to or + greater than the number of platform labels. + + A dense utliziation of the entries in the platform label table + is possible and expected aas the platform labels are locally + allocated. + + If the number of platform label table entries is set to 0 no + label will be recognized by the kernel and mpls forwarding + will be disabled. + + Reducing this value will remove all label routing entries that + no longer fit in the table. + + Possible values: 0 - 1048575 + Default: 0 diff --git a/Documentation/networking/packet_mmap.txt b/Documentation/networking/packet_mmap.txt index a6d7cb9..daa015a 100644 --- a/Documentation/networking/packet_mmap.txt +++ b/Documentation/networking/packet_mmap.txt @@ -440,9 +440,10 @@ and the following flags apply: +++ Capture process: from include/linux/if_packet.h - #define TP_STATUS_COPY 2 - #define TP_STATUS_LOSING 4 - #define TP_STATUS_CSUMNOTREADY 8 + #define TP_STATUS_COPY (1 << 1) + #define TP_STATUS_LOSING (1 << 2) + #define TP_STATUS_CSUMNOTREADY (1 << 3) + #define TP_STATUS_CSUM_VALID (1 << 7) TP_STATUS_COPY : This flag indicates that the frame (and associated meta information) has been truncated because it's @@ -466,6 +467,12 @@ TP_STATUS_CSUMNOTREADY: currently it's used for outgoing IP packets which reading the packet we should not try to check the checksum. +TP_STATUS_CSUM_VALID : This flag indicates that at least the transport + header checksum of the packet has been already + validated on the kernel side. If the flag is not set + then we are free to check the checksum by ourselves + provided that TP_STATUS_CSUMNOTREADY is also not set. + for convenience there are also the following defines: #define TP_STATUS_KERNEL 0 diff --git a/Documentation/networking/pktgen.txt b/Documentation/networking/pktgen.txt index 6915c6b..0344f1d 100644 --- a/Documentation/networking/pktgen.txt +++ b/Documentation/networking/pktgen.txt @@ -3,13 +3,11 @@ HOWTO for the linux packet generator ------------------------------------ -Date: 041221 - -Enable CONFIG_NET_PKTGEN to compile and build pktgen.o either in kernel -or as module. Module is preferred. insmod pktgen if needed. Once running -pktgen creates a thread on each CPU where each thread has affinity to its CPU. -Monitoring and controlling is done via /proc. Easiest to select a suitable -a sample script and configure. +Enable CONFIG_NET_PKTGEN to compile and build pktgen either in-kernel +or as a module. A module is preferred; modprobe pktgen if needed. Once +running, pktgen creates a thread for each CPU with affinity to that CPU. +Monitoring and controlling is done via /proc. It is easiest to select a +suitable sample script and configure that. On a dual CPU: @@ -27,7 +25,7 @@ For monitoring and control pktgen creates: Tuning NIC for max performance ============================== -The default NIC setting are (likely) not tuned for pktgen's artificial +The default NIC settings are (likely) not tuned for pktgen's artificial overload type of benchmarking, as this could hurt the normal use-case. Specifically increasing the TX ring buffer in the NIC: @@ -35,20 +33,20 @@ Specifically increasing the TX ring buffer in the NIC: A larger TX ring can improve pktgen's performance, while it can hurt in the general case, 1) because the TX ring buffer might get larger -than the CPUs L1/L2 cache, 2) because it allow more queueing in the +than the CPU's L1/L2 cache, 2) because it allows more queueing in the NIC HW layer (which is bad for bufferbloat). -One should be careful to conclude, that packets/descriptors in the HW +One should hesitate to conclude that packets/descriptors in the HW TX ring cause delay. Drivers usually delay cleaning up the -ring-buffers (for various performance reasons), thus packets stalling -the TX ring, might just be waiting for cleanup. +ring-buffers for various performance reasons, and packets stalling +the TX ring might just be waiting for cleanup. -This cleanup issues is specifically the case, for the driver ixgbe -(Intel 82599 chip). This driver (ixgbe) combine TX+RX ring cleanups, +This cleanup issue is specifically the case for the driver ixgbe +(Intel 82599 chip). This driver (ixgbe) combines TX+RX ring cleanups, and the cleanup interval is affected by the ethtool --coalesce setting of parameter "rx-usecs". -For ixgbe use e.g "30" resulting in approx 33K interrupts/sec (1/30*10^6): +For ixgbe use e.g. "30" resulting in approx 33K interrupts/sec (1/30*10^6): # ethtool -C ethX rx-usecs 30 @@ -60,15 +58,16 @@ Running: Stopped: eth1 Result: OK: max_before_softirq=10000 -Most important the devices assigned to thread. Note! A device can only belong -to one thread. +Most important are the devices assigned to the thread. Note that a +device can only belong to one thread. Viewing devices =============== -Parm section holds configured info. Current hold running stats. -Result is printed after run or after interruption. Example: +The Params section holds configured information. The Current section +holds running statistics. The Result is printed after a run or after +interruption. Example: /proc/net/pktgen/eth1 @@ -93,7 +92,8 @@ Result: OK: 13101142(c12220741+d880401) usec, 10000000 (60byte,0frags) Configuring threads and devices ================================ -This is done via the /proc interface easiest done via pgset in the scripts +This is done via the /proc interface, and most easily done via pgset +as defined in the sample scripts. Examples: @@ -192,10 +192,11 @@ Examples: pgset "rate 300M" set rate to 300 Mb/s pgset "ratep 1000000" set rate to 1Mpps -Example scripts -=============== +Sample scripts +============== -A collection of small tutorial scripts for pktgen is in examples dir. +A collection of small tutorial scripts for pktgen is in the +samples/pktgen directory: pktgen.conf-1-1 # 1 CPU 1 dev pktgen.conf-1-2 # 1 CPU 2 dev @@ -206,25 +207,26 @@ pktgen.conf-1-1-ip6 # 1 CPU 1 dev ipv6 pktgen.conf-1-1-ip6-rdos # 1 CPU 1 dev ipv6 w. route DoS pktgen.conf-1-1-flows # 1 CPU 1 dev multiple flows. -Run in shell: ./pktgen.conf-X-Y It does all the setup including sending. +Run in shell: ./pktgen.conf-X-Y +This does all the setup including sending. Interrupt affinity =================== -Note when adding devices to a specific CPU there good idea to also assign -/proc/irq/XX/smp_affinity so the TX-interrupts gets bound to the same CPU. -as this reduces cache bouncing when freeing skb's. +Note that when adding devices to a specific CPU it is a good idea to +also assign /proc/irq/XX/smp_affinity so that the TX interrupts are bound +to the same CPU. This reduces cache bouncing when freeing skbs. Enable IPsec ============ -Default IPsec transformation with ESP encapsulation plus Transport mode -could be enabled by simply setting: +Default IPsec transformation with ESP encapsulation plus transport mode +can be enabled by simply setting: pgset "flag IPSEC" pgset "flows 1" To avoid breaking existing testbed scripts for using AH type and tunnel mode, -user could use "pgset spi SPI_VALUE" to specify which formal of transformation +you can use "pgset spi SPI_VALUE" to specify which transformation mode to employ. diff --git a/Documentation/networking/rds.txt b/Documentation/networking/rds.txt index c67077c..e1a3d59 100644 --- a/Documentation/networking/rds.txt +++ b/Documentation/networking/rds.txt @@ -62,11 +62,10 @@ Socket Interface ================ AF_RDS, PF_RDS, SOL_RDS - These constants haven't been assigned yet, because RDS isn't in - mainline yet. Currently, the kernel module assigns some constant - and publishes it to user space through two sysctl files - /proc/sys/net/rds/pf_rds - /proc/sys/net/rds/sol_rds + AF_RDS and PF_RDS are the domain type to be used with socket(2) + to create RDS sockets. SOL_RDS is the socket-level to be used + with setsockopt(2) and getsockopt(2) for RDS specific socket + options. fd = socket(PF_RDS, SOCK_SEQPACKET, 0); This creates a new, unbound RDS socket. diff --git a/Documentation/networking/s2io.txt b/Documentation/networking/s2io.txt index d2a9f43..0362a42 100644 --- a/Documentation/networking/s2io.txt +++ b/Documentation/networking/s2io.txt @@ -38,7 +38,7 @@ The corresponding adapter's LED will blink multiple times. 3. Features supported: a. Jumbo frames. Xframe I/II supports MTU up to 9600 bytes, -modifiable using ifconfig command. +modifiable using ip command. b. Offloads. Supports checksum offload(TCP/UDP/IP) on transmit and receive, TSO. diff --git a/Documentation/networking/scaling.txt b/Documentation/networking/scaling.txt index 99ca40e..cbfac09 100644 --- a/Documentation/networking/scaling.txt +++ b/Documentation/networking/scaling.txt @@ -421,6 +421,15 @@ best CPUs to share a given queue are probably those that share the cache with the CPU that processes transmit completions for that queue (transmit interrupts). +Per TX Queue rate limitation: +============================= + +These are rate-limitation mechanisms implemented by HW, where currently +a max-rate attribute is supported, by setting a Mbps value to + +/sys/class/net/<dev>/queues/tx-<n>/tx_maxrate + +A value of zero means disabled, and this is the default. Further Information =================== diff --git a/Documentation/networking/vxge.txt b/Documentation/networking/vxge.txt index bb76c66..abfec24 100644 --- a/Documentation/networking/vxge.txt +++ b/Documentation/networking/vxge.txt @@ -39,7 +39,7 @@ iii) PCI-SIG's I/O Virtualization iv) Jumbo frames X3100 Series supports MTU up to 9600 bytes, modifiable using - ifconfig command. + ip command. v) Offloads supported: (Enabled by default) Checksum offload (TCP/UDP/IP) on transmit and receive paths |