- 03 May, 2012 4 commits
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Yuchung Cheng authored
This patch implements RFC 5827 early retransmit (ER) for TCP. It reduces DUPACK threshold (dupthresh) if outstanding packets are less than 4 to recover losses by fast recovery instead of timeout. While the algorithm is simple, small but frequent network reordering makes this feature dangerous: the connection repeatedly enter false recovery and degrade performance. Therefore we implement a mitigation suggested in the appendix of the RFC that delays entering fast recovery by a small interval, i.e., RTT/4. Currently ER is conservative and is disabled for the rest of the connection after the first reordering event. A large scale web server experiment on the performance impact of ER is summarized in section 6 of the paper "Proportional Rate Reduction for TCP”, IMC 2011. http://conferences.sigcomm.org/imc/2011/docs/p155.pdf Note that Linux has a similar feature called THIN_DUPACK. The differences are THIN_DUPACK do not mitigate reorderings and is only used after slow start. Currently ER is disabled if THIN_DUPACK is enabled. I would be happy to merge THIN_DUPACK feature with ER if people think it's a good idea. ER is enabled by sysctl_tcp_early_retrans: 0: Disables ER 1: Reduce dupthresh to packets_out - 1 when outstanding packets < 4. 2: (Default) reduce dupthresh like mode 1. In addition, delay entering fast recovery by RTT/4. Note: mode 2 is implemented in the third part of this patch series. Signed-off-by:
Yuchung Cheng <ycheng@google.com> Acked-by:
Neal Cardwell <ncardwell@google.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Yuchung Cheng authored
This a prepartion patch that refactors the code to enter recovery into a new function tcp_enter_recovery(). It's needed to implement the delayed fast retransmit in ER. Signed-off-by:
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Stephen Rothwell authored
Fix this compiler warning (on PowerPC) by not marking a parameter as const: drivers/net/ethernet/pasemi/pasemi_mac.c: In function 'pasemi_mac_replenish_rx_ring': drivers/net/ethernet/pasemi/pasemi_mac.c:646:3: warning: passing argument 1 of 'netdev_alloc_skb' discards qualifiers from pointer target type include/linux/skbuff.h:1706:31: note: expected 'struct net_device *' but argument is of type 'const struct net_device *' Cc: Olof Johansson <olof@lixom.net> Cc: Pradeep A. Dalvi <netdev@pradeepdalvi.com> Signed-off-by:
Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by:
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Dmitry Kravkov authored
commit 30a5de77 added ability to use single MSI-X vector, but lack proper handling for 57710/57711 HW Signed-off-by:
Dmitry Kravkov <dmitry@broadcom.com> Signed-off-by:
Eilon Greenstein <eilong@broadcom.com> Signed-off-by:
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- 02 May, 2012 7 commits
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Greg Rose authored
If the user request for the number of VFs in the max_vfs parameter is out of range then reset the value to the default value of zero. This makes the behavior of the ixgbe driver the same as for the igb driver. Signed-off-by:
Greg Rose <gregory.v.rose@intel.com> Tested-by:
Robert Garrett <robertx.e.garrett@intel.com> Signed-off-by:
Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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Greg Rose authored
If the host VMM administrator has set the virtual function device's MAC address then also deny VF requests for MACVLAN filters. Signed-off-by:
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Don Skidmore authored
Some of our adapters have thermal data available, this patch exports this data via hwmon sysfs interface. Signed-off-by:
Don Skidmore <donald.c.skidmore@intel.com> Tested-by:
Stephen Ko <stephen.s.ko@intel.com> Signed-off-by:
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Don Skidmore authored
Some 82599 adapters contain thermal data that we can get to via an i2c interface. These functions provide support to get at that data. A following patch will export this data. Signed-off-by:
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Bruce Allan authored
Secondary unicast and multicast addresses are added to the Receive Address registers (RAR) for most parts supported by the driver. For 82579, there is only one actual RAR and a number of Shared Receive Address registers (SHRAR) that are shared among the driver and f/w which can be reserved and write-protected by the f/w. On this device, use the SHRARs that are not taken by f/w for the additional addresses. Add a MAC ops function pointer infrastructure (similar to other MAC operations in the driver) for setting RARs, introduce a new rar_set function for 82579 and convert the existing code that sets RARs on other devices to a generic rar_set function. Signed-off-by:
Bruce Allan <bruce.w.allan@intel.com> Tested-by:
Jeff Pieper <jeffrey.e.pieper@intel.com> Signed-off-by:
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Bruce Allan authored
The PHY initialization flows and assorted workarounds for 82577/8/9 done during driver load and resume from Sx should be the same yet they are not. Combine the current flows/workarounds into a common set of functions that are called during the different code paths. Signed-off-by:
Aaron Brown <aaron.f.brown@intel.com> Signed-off-by:
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Bruce Allan authored
An update to the EEPROM on 82579 will extend a delay in hardware to fix an issue with WoL not working after a G3->S5 transition which is unrelated to the driver. However, this extended delay conflicts with nominal operation of the device when it is initialized by the driver and after every reset of the hardware (i.e. the driver starts configuring the device before the hardware is done with it's own configuration work). The workaround for when the driver is in control of the device is to tell the hardware after every reset the configuration delay should be the original shorter one. Some pre-existing variables are renamed generically to be re-used with new register accesses. Signed-off-by:
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- 01 May, 2012 29 commits
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Eric Dumazet authored
Add ECN (Explicit Congestion Notification) marking capability to netem tc qdisc add dev eth0 root netem drop 0.5 ecn Instead of dropping packets, try to ECN mark them. Signed-off-by:
Eric Dumazet <edumazet@google.com> Cc: Neal Cardwell <ncardwell@google.com> Cc: Tom Herbert <therbert@google.com> Cc: Hagen Paul Pfeifer <hagen@jauu.net> Cc: Stephen Hemminger <shemminger@vyatta.com> Acked-by:
Hagen Paul Pfeifer <hagen@jauu.net> Signed-off-by:
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Eric Dumazet authored
remove useless casts and rename variables for less confusion. Signed-off-by:
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Eric Dumazet authored
TCP or UDP stacks have big enough latencies that prefetching next pointer is worth it. Signed-off-by:
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James Chapman authored
The netlink API lets users create unmanaged L2TPv3 tunnels using iproute2. Until now, a request to create an unmanaged L2TPv3 IP encapsulation tunnel over IPv6 would be rejected with EPROTONOSUPPORT. Now that l2tp_ip6 implements sockets for L2TP IP encapsulation over IPv6, we can add support for that tunnel type. Signed-off-by:
James Chapman <jchapman@katalix.com> Signed-off-by:
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Chris Elston authored
L2TPv3 defines an IP encapsulation packet format where data is carried directly over IP (no UDP). The kernel already has support for L2TP IP encapsulation over IPv4 (l2tp_ip). This patch introduces support for L2TP IP encapsulation over IPv6. The implementation is derived from ipv6/raw and ipv4/l2tp_ip. Signed-off-by:
Chris Elston <celston@katalix.com> Signed-off-by:
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Chris Elston authored
For implementing other protocols on top of IPv6, such as L2TPv3's IP encapsulation over ipv6, we'd like to call some IPv6 functions which are not currently exported. This patch exports them. Signed-off-by:
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Chris Elston authored
This patch adds support for unmanaged L2TPv3 tunnels over IPv6 using the netlink API. We already support unmanaged L2TPv3 tunnels over IPv4. A patch to iproute2 to make use of this feature will be submitted separately. Signed-off-by:
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Chris Elston authored
If an L2TP tunnel uses IPv6, make sure the l2tp debugfs file shows the IPv6 address correctly. Signed-off-by:
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James Chapman authored
Userspace uses connect() to associate a pppol2tp socket with a tunnel socket. This needs to allow the caller to supply the new IPv6 sockaddr_pppol2tp structures if IPv6 is used. Signed-off-by:
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James Chapman authored
Checkpatch warns about the use of __attribute__((packed)). So use the recommended __packed syntax instead. Signed-off-by:
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James Chapman authored
The l2tp_ip socket currently maintains packet/byte stats in its private socket structure. But these counters aren't exposed to userspace and so serve no purpose. The counters were also smp-unsafe. So this patch just gets rid of the stats. While here, change a couple of internal __u32 variables to u32. Signed-off-by:
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James Chapman authored
Cleanup the l2tp_ip code to make use of an existing ipv4 support function. Signed-off-by:
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James Chapman authored
L2TP uses 64-bit counters but since these are not updated atomically, we need to make them safe for smp. This patch addresses that. Signed-off-by:
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Huang, Xiong authored
PHY polling code for FPGA is considered in every MDIO R/W API. no need to add additional code to atl1c_change_mtu. Signed-off-by:
xiong <xiong@qca.qualcomm.com> Tested-by:
David Liu <dwliu@qca.qaulcomm.com> Signed-off-by:
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Huang, Xiong authored
L0S might be unstable if no cable link, only enable it when link up. Signed-off-by:
Liu David <dwliu@qca.qualcomm.com> Signed-off-by:
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Huang, Xiong authored
There may be tx-skbs still pending in HW when PHY link down. Reset MAC will make the DMA engine go to the start point. and release all pending skbs. Note: Reset MAC will clear any interrupt status and mask. Signed-off-by:
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Huang, Xiong authored
common_task might be running while close routine is called, wait/cancel it. Signed-off-by:
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Huang, Xiong authored
The hardware incorrectly process L0S/L1 entrance if the chipset/root response after specific/shorter timer and cause system hang. Enlarge the timeout value to avoid this issue. Signed-off-by:
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Huang, Xiong authored
On some platform with EEPROM/OTP existing, the BIOS could overwrite a new MAC address for the NIC. so, the permanent mac address should be from BIOS. the address is restored when driver removing. Voltage raising isn't applicable for l1d. Replace swab32 with htonl for big/little endian platform. related Registers are refined as well. Signed-off-by:
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Huang, Xiong authored
The Close-action is done by atl1c_reset_pcie, remove it from atl1c_get_permanent_address. Signed-off-by:
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Huang, Xiong authored
WoL status is read-clear and should be cleared when in S0 status. putting it in atl1c_reset_pcie is more suitable than in atl1c_get_permanent_address. Signed-off-by:
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Huang, Xiong authored
On some platforms the PHY settings need to change depending on the cable link status to get better stability. Signed-off-by:
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Huang, Xiong authored
All supported devices have one issue that msi interrupt doesn't assert if pci command register bit (PCI_COMMAND_INTX_DISABLE) is set. Add workaround in drivers/pci/quirks.c Signed-off-by:
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Eric Dumazet authored
Before doing skb->head_frag work on bnx2x driver, I found too much stuff was inlined in bnx2x/bnx2x_cmn.h for no good reason and made my work not very easy. Move some big functions out of this include file to the respective .c file. A lot of inline keywords are not needed at all in this huge driver. text data bss dec hex filename 490083 1270 56 491409 77f91 bnx2x/bnx2x.ko.before 484206 1270 56 485532 7689c bnx2x/bnx2x.ko Signed-off-by:
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RongQing.Li authored
The reset logic after a Rx FIFO overrun will clear the programmed multicast addresses. This patch fixes the issue by reprogramming the registers after the reset. The commit eefc48b0 ("pch_gbe: reprogram multicast address register on reset") tried to fix this problem, but it introduces unnecessary codes. In fact, all multicast addresses have been saved in netdev->mc, So we can call pch_gbe_set_multi() directly after reset_hw and reset_rx. This commit kills 50+ line codes Cc: Richard Cochran <richardcochran@gmail.com> Cc: Takahiro Shimizu <tshimizu818@gmail.com> Signed-off-by:
RongQing.Li <roy.qing.li@gmail.com> Acked-by:
Richard Cochran <richardcochran@gmail.com> Signed-off-by:
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Eric Dumazet authored
__skb_splice_bits() can check if skb to be spliced has its skb->head mapped to a page fragment, instead of a kmalloc() area. If so we can avoid a copy of the skb head and get a reference on underlying page. Signed-off-by:
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Eric Dumazet authored
TCP coalesce can check if skb to be merged has its skb->head mapped to a page fragment, instead of a kmalloc() area. We had to disable coalescing in this case, for performance reasons. We 'upgrade' skb->head as a fragment in itself. This reduces number of cache misses when user makes its copies, since a less sk_buff are fetched. This makes receive and ofo queues shorter and thus reduce cache line misses in TCP stack. This is a followup of patch "net: allow skb->head to be a page fragment" Tested with tg3 nic, with GRO on or off. We can see "TCPRcvCoalesce" counter being incremented. Signed-off-by:
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Eric Dumazet authored
GRO can check if skb to be merged has its skb->head mapped to a page fragment, instead of a kmalloc() area. We 'upgrade' skb->head as a fragment in itself This avoids the frag_list fallback, and permits to build true GRO skb (one sk_buff and up to 16 fragments), using less memory. This reduces number of cache misses when user makes its copy, since a single sk_buff is fetched. This is a followup of patch "net: allow skb->head to be a page fragment" Signed-off-by:
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