- 13 Mar, 2013 16 commits
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Martin Hundebøll authored
To be able to decode a network coded packet, a node must already know one of the two coded packets. This is done by buffering skbs before transmission and buffering packets sniffed with promiscuous mode from other hosts. Packets are kept in a buffer similar to the one with forward-skbs: A hash table, where each entry, which corresponds to a src-dst pair, has a linked list packets. Signed-off-by:
Martin Hundebøll <martin@hundeboll.net> Signed-off-by:
Marek Lindner <lindner_marek@yahoo.de> Signed-off-by:
Antonio Quartulli <ordex@autistici.org>
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Martin Hundebøll authored
Before adding forward-skbs to the coding buffer, the buffer is searched for a potential coding opportunity. If one is found, the two packets are network coded and transmitted right away. If not, the forward-skb is added to the buffer. Network coded packets are transmitted with information about the two receivers and the two coded packets. The first receiver is given by the MAC header, while the second is given in the payload/bat-header. The second receiver uses promiscuous mode to receive the packet and check the second destination. Signed-off-by:
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Martin Hundebøll authored
Two be able to network code two packets, one packet must be buffered until the next is available. This is done in a "coding buffer", which is essentially a hash table with lists of packets. Each entry in the hash table corresponds to a specific src-dst pair, which has a linked list of packets that are buffered. This patch adds skbs to the buffer just before forwarding them. The buffer is traversed every 10 ms, where timed skbs are removed from the buffer and transmitted. To allow experiments with the network coding scheme, the timeout is tunable through a file in debugfs. Signed-off-by:
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Martin Hundebøll authored
To use network coding efficiently, a relay must know when neighbor nodes are likely to have enough information to be able to decode a network coded packet. This is detected by using OGMs from batman-adv to discover when one neighbor is in range of another neighbor. The relay check the TLL to detect when an OGM is forwarded from one neighbor by another neighbor, and thereby knows that the two neighbors are in range and thus overhear packets sent by each other. This information is saved in the orig_node struct to be used when searching for coding opportunities. Two lists are added to the orig_node struct: One for neighbors that can hear the orig_node (outgoing nc_nodes) and one for neighbors that the orig_node can hear (incoming nc_nodes). Information about nc_nodes is kept for 10 seconds and is available through debugfs in batman_adv/nc_nodes to use when debugging network coding. Signed-off-by:
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Martin Hundebøll authored
Network coding exploits the 802.11 shared medium to allow multiple packets to be sent in a single transmission. In brief, a relay can XOR two packets, and send the coded packet to two destinations. The receivers can decode one of the original packets by XOR'ing the coded packet with the other original packet. This will lead to increased throughput in topologies where two packets cross one relay. In a simple topology with three nodes, it takes four transmissions without network coding to get one packet from Node A to Node B and one from Node B to Node A: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <--- p2 ---- Node R Node B 4. Node A Node R ---- p1 ---> Node B With network coding, the relay only needs one transmission, which saves us one slot of valuable airtime: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <- p1 x p2 - Node R - p1 x p2 -> Node B The same principle holds for a topology including five nodes. Here the packets from Node A and Node B are overheard by Node C and Node D, respectively. This allows Node R to send a network coded packet to save one transmission: Node A Node B | \ / | | p1 p2 | | \ / | p1 > Node R < p2 | | | / \ | | p1 x p2 p1 x p2 | v / \ v / \ Node C < > Node D More information is available on the open-mesh.org wiki[1]. This patch adds the initial code to support network coding in batman-adv. It sets up a worker thread to do house keeping and adds a sysfs file to enable/disable network coding. The feature is disabled by default, as it requires a wifi-driver with working promiscuous mode, and also because it adds a small delay at each hop. [1] http://www.open-mesh.org/projects/batman-adv/wiki/CatwomanSigned-off-by: -
Antonio Quartulli authored
In C standard any expression different from 0 will be converted to 'true' when casting to bool (whatever is the length of the value). Therefore all the "!!" conversions can be removed. Signed-off-by:
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Martin Hundebøll authored
batadv_check_unicast_packet() is changed to return a value based on the reason to drop the packet, which will be useful information for future users of batadv_check_unicast_packet(). Signed-off-by:
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Marek Lindner authored
The batadv_priv struct carries a pointer to its own interface struct. Therefore, it is not necessary to retrieve the soft_iface via the primary interface. Signed-off-by:
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Shahed Shaikh authored
Signed-off-by:
Shahed Shaikh <shahed.shaikh@qlogic.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Himanshu Madhani authored
QLogic applications use these callbacks to perform o NIC Partitioning (NPAR) configuration and management o Diagnostic tests o Flash access and updates Signed-off-by:
Himanshu Madhani <himanshu.madhani@qlogic.com> Signed-off-by:
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David S. Miller authored
Mugunthan V N says: ==================== This patch serires implements the following features in CPSW driver * get/set phy link settings * interrupt pacing * get phy id via ioctl cmd SIOCGMIIPHY Changes from initial version * Made active-slave common for cpts, ethtool and SIOCGMIIPHY ioctl * Cleaned CPSW DT binding documentation by seperating slave nodes under sub-section * implemented get phy id via ioctl cmd SIOCGMIIPHY ==================== Signed-off-by: -
Mugunthan V N authored
Implement get phy_id via ioctl SIOCGMIIPHY. In switch mode active phy_id is returned and in dual EMAC mode slave's specific phy_id is returned. Signed-off-by:
Mugunthan V N <mugunthanvnm@ti.com> Signed-off-by:
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Mugunthan V N authored
This patch implements support for interrupt pacing block of CPSW via ethtool Inetrrupt pacing block is common of both the ethernet interface in dual emac mode Signed-off-by:
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Mugunthan V N authored
This patch implements get/set of the phy settings via ethtool apis Signed-off-by:
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Mugunthan V N authored
Change cpts_active_slave to active_slave so that the same DT property can be used to ethtool and SIOCGMIIPHY. CC: Richard Cochran <richardcochran@gmail.com> Signed-off-by:
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Mugunthan V N authored
Move all the slave note properties to separate section to reduce the confusion between slave note properties and cpsw node properties Signed-off-by:
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- 12 Mar, 2013 24 commits
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David J. Choi authored
Implement to collect ethernet statistical information on ks8851_mll device. Signed-off-by:
David J. Choi <david.choi@micrel.com> Signed-off-by:
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Zhang Yanfei authored
remove cast for kmalloc/kzalloc return value. Signed-off-by:
Zhang Yanfei <zhangyanfei@cn.fujitsu.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Karsten Keil <isdn@linux-pingi.de> Cc: netdev@vger.kernel.org Signed-off-by:
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Zhang Yanfei authored
remove cast for kmalloc return value. Signed-off-by:
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Michael Stapelberg authored
This has been tested on a qnap TS-119P II. Note that enabling WOL with "ethtool -s eth0 wol g" is not enough; you also need to tell the PIC microcontroller inside the qnap that WOL should be enabled by sending 0xF2 with qcontrol(1) and you have to disable EUP ("Energy-using Products", a European power-saving thing) by sending 0xF4. Signed-off-by:Michael Stapelberg <michael@stapelberg.de> Signed-off-by:
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Michael Stapelberg authored
This allows ethernet drivers (such as the mv643xx_eth) to support Wake on LAN on platforms where PHY registers have to be configured for Wake on LAN (e.g. the Marvell Kirkwood based qnap TS-119P II). Signed-off-by:
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Nandita Dukkipati authored
This is the second of the TLP patch series; it augments the basic TLP algorithm with a loss detection scheme. This patch implements a mechanism for loss detection when a Tail loss probe retransmission plugs a hole thereby masking packet loss from the sender. The loss detection algorithm relies on counting TLP dupacks as outlined in Sec. 3 of: http://tools.ietf.org/html/draft-dukkipati-tcpm-tcp-loss-probe-01 The basic idea is: Sender keeps track of TLP "episode" upon retransmission of a TLP packet. An episode ends when the sender receives an ACK above the SND.NXT (tracked by tlp_high_seq) at the time of the episode. We want to make sure that before the episode ends the sender receives a "TLP dupack", indicating that the TLP retransmission was unnecessary, so there was no loss/hole that needed plugging. If the sender gets no TLP dupack before the end of the episode, then it reduces ssthresh and the congestion window, because the TLP packet arriving at the receiver probably plugged a hole. Signed-off-by:
Nandita Dukkipati <nanditad@google.com> Acked-by:
Neal Cardwell <ncardwell@google.com> Signed-off-by:
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Nandita Dukkipati authored
This patch series implement the Tail loss probe (TLP) algorithm described in http://tools.ietf.org/html/draft-dukkipati-tcpm-tcp-loss-probe-01. The first patch implements the basic algorithm. TLP's goal is to reduce tail latency of short transactions. It achieves this by converting retransmission timeouts (RTOs) occuring due to tail losses (losses at end of transactions) into fast recovery. TLP transmits one packet in two round-trips when a connection is in Open state and isn't receiving any ACKs. The transmitted packet, aka loss probe, can be either new or a retransmission. When there is tail loss, the ACK from a loss probe triggers FACK/early-retransmit based fast recovery, thus avoiding a costly RTO. In the absence of loss, there is no change in the connection state. PTO stands for probe timeout. It is a timer event indicating that an ACK is overdue and triggers a loss probe packet. The PTO value is set to max(2*SRTT, 10ms) and is adjusted to account for delayed ACK timer when there is only one oustanding packet. TLP Algorithm On transmission of new data in Open state: -> packets_out > 1: schedule PTO in max(2*SRTT, 10ms). -> packets_out == 1: schedule PTO in max(2*RTT, 1.5*RTT + 200ms) -> PTO = min(PTO, RTO) Conditions for scheduling PTO: -> Connection is in Open state. -> Connection is either cwnd limited or no new data to send. -> Number of probes per tail loss episode is limited to one. -> Connection is SACK enabled. When PTO fires: new_segment_exists: -> transmit new segment. -> packets_out++. cwnd remains same. no_new_packet: -> retransmit the last segment. Its ACK triggers FACK or early retransmit based recovery. ACK path: -> rearm RTO at start of ACK processing. -> reschedule PTO if need be. In addition, the patch includes a small variation to the Early Retransmit (ER) algorithm, such that ER and TLP together can in principle recover any N-degree of tail loss through fast recovery. TLP is controlled by the same sysctl as ER, tcp_early_retrans sysctl. tcp_early_retrans==0; disables TLP and ER. ==1; enables RFC5827 ER. ==2; delayed ER. ==3; TLP and delayed ER. [DEFAULT] ==4; TLP only. The TLP patch series have been extensively tested on Google Web servers. It is most effective for short Web trasactions, where it reduced RTOs by 15% and improved HTTP response time (average by 6%, 99th percentile by 10%). The transmitted probes account for <0.5% of the overall transmissions. Signed-off-by:
Yuchung Cheng <ycheng@google.com> Signed-off-by:
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Fabio Estevam authored
Using devm_request_and_ioremap() can make the code cleaner and simpler. Signed-off-by:
Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by:
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Fabio Estevam authored
PCI header is not needed, so get rid of it. Signed-off-by:
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Wei Yongjun authored
Using for_each_set_bit() to simplify the code. Signed-off-by:
Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by:
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Wei Yongjun authored
Using for_each_set_bit_from() to simplify the code. Signed-off-by:
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Wei Yongjun authored
Using list_move() instead of list_del() + list_add(). Signed-off-by:
Ariel Elior <ariele@broadcom.com> Signed-off-by:
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Wei Yongjun authored
Remove duplicated include. Signed-off-by:
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Dmitry Kravkov authored
bnx2x FW 1.78.17 properly supports DCBX configuration for 4-port devices, enabling FCoE support on 57840 boards. Signed-off-by:
Dmitry Kravkov <dmitry@broadcom.com> Signed-off-by:
Yuval Mintz <yuvalmin@broadcom.com> Signed-off-by:
Eilon Greenstein <eilong@broadcom.com> Signed-off-by:
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Dmitry Kravkov authored
Update appropriate HSI files and adapt driver accordingly. Signed-off-by:
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Yuval Mintz authored
Prevent bnx2x devices which are used mainly for storage from using zero MAC addresses as their primary MAC address. Signed-off-by:
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Yaniv Rosner authored
Configure SFP+ tap values to optimize link signal according to NVRAM setup. Signed-off-by:
Yaniv Rosner <yanivr@broadcom.com> Signed-off-by:
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Yaniv Rosner authored
Signed-off-by:
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Yaniv Rosner authored
Add RJ45 SFP module detection. In case the user set 10G link speed, and the module doesn't support it, then force the speed to 1G and notify the user. Signed-off-by:
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Yuval Mintz authored
Signed-off-by:
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Ariel Elior authored
1. Support sysfs interface for getting the maximal number of virtual functions of a given physical function. 2. Support sysfs interface for getting and setting the current number of virtual functions. Signed-off-by:
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Ariel Elior authored
This patch adds support for iproute2 callbacks allowing querying a physical function as to its child virtual functions, and setting the macs and vlans of said virtual functions. Signed-off-by:
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Ariel Elior authored
When using a chip operating in Single Function mode, when the chip is probed the bnx2x would print a message warning of an unknown Multi Function mode. This patch prevents said message. Signed-off-by:
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Yuval Mintz authored
In latest boards, the CHIP_METAL register contains an incorrect revision value, so the correct one needs to be obtained in a different manner. Signed-off-by:
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