Porting application from libevent

[Ken Cox]

I have several server applications based on libevent (
https://github.com/libevent/libevent) that use high-resolution timers, UDP,
and TCP sockets.  Right now they run on SR-IOV instances and I would like
to port these to DPDK to get access to bonded interfaces.  Any advice?

I read most of the DPDK Programmer's Guide, and looked at the Event Device
Library, but it is quite low-level and will entail a substantial amount of
rework.
I looked at dpdk-ans (https://github.com/ansyun/dpdk-ans), which provides a
socket API on top of DPDK, but it seems to be not recently maintained.
I also looked at seastar (https://github.com/scylladb/seastar), which
provides an event-driven framework on top of DPDK, but it would require a
complete rewrite from libevent to futures and C++17.

Any advice would be very much appreciated!

--
-Ken

Mellanox & Qlogic & Molex & Intel

[Ken]

Hi ,
Please help to quote as below, destination: 宁波 China, thanks!
请提供如下价格，货到宁波，谢谢！












　
　
　
　
　
Quantity(pcs)
　

Item
PN
Model
Part
Vendor
100
300
500
Remark

1
MCX512A-ACAT
2x25Gb SFP28 ConnectX-5 EN Adapter Card 10/25GbE
PCIe card
Mellanox
100
300
500
　

2
MCX631102AS-ADAT
2x25G SFP28 ConnectX-6 Lx EN Adapter Card 25GbE Crypto Disabled
PCIe card
Mellanox
100
300
500
二选 一

3
MCX631102AN-ADAT
PCIe card
Mellanox
100
300
500

6
MCX542B-ACAN
ConnectX®-5 EN network interface card for OCP, with host management, 25GbE dual-port SFP28, PCIe3.0 x8, UEFI Enabled, no bracket Halogen free
OCP mezz
Mellanox
100
300
500
　

7
MCX545B-CCUN
ConnectX®-5 EN 1x 100GbE QSFP28 PCIe 3.0 x16 UEFI Enabled
OCP mezz
Mellanox
100
300
500
　

4
QLE2742-SR-CK
PCIe 3.0, x8, Dual / 2-ports, 32GFC, SR-Optic, SFP+, Low Profile
PCIe card
Qlogic
100
300
500
　

5
QLE2672-CK
16Gb Dual-port FC HBA, PCI-E x8, LC multi-mode optic, Box, 2xSFP included
PCIe card
Qlogic
100
300
500
　

6
XXV710DA2OCP1
Ethernet network adaptor for OCP (2x25Gb 2*SPF+  EN Adapter Card 10/25GbE)
OCP mezz
Intel
  60 
300
　
　

7
BCM957414M4142C
NeXtreme M225P network adaptor (2*25Gb SFP28, PCIe3.0 x8 10/25 Gbs)
OCP mezz
Broadcom 
  60 
300
　
　

8
MCX4421A-ACQN
Mellanox ConnectX-4 LX EN Network Interface Card For OCP2.0 2x25Гбит/сек Dual Port 2xSFP28 Host Management Mezzanine OCP 2.0 Type 1 PCI-E 3.0(MCX4421A-ACQN)  
OCP mezz
Mellanox
100
300
500
　

9
　
205058-3020 NPIO 8x STR to 2* 4x RA, 750mm
cable
Molex
2000
　
　
　
Yours/Ken
k...@whbam.com
 

[dpdk-users] Question about driver/controller MTU enforcement with MTU less than jumbo frame size

[Coulson, Ken]

Is it possible to have an MTU enforced on rx that is less than jumbo size 
frames?
>From the DPDK driver code snippet for ixgbe if MTU < 1518 then the jumbo_frame 
>control bit in the chip is set to 0.
The controller manual says the maximum frame size is only meaningful when the 
jumbo_frame control bit is 1.
Does it work to leave jumbo_frame set to 1 but set max frame size to something 
smaller than the jumbo size of 1518?

>From 82559 10 GbE Controller manual, section 8.2.3.22.13, page 669, Max Frame 
>Size:

   This field defines the maximum frame size in bytes units from Ethernet MAC
   addresses up to inclusive the CRC.  Frames received that are larger than this
   value are dropped.  This field is meaningful when jumbo frames are enabled
   (HLREG0.JUMBOEN = 1b).  When jumbo frames are not enabled the 82599 uses a
   hardwired value of 1518 for this field.  The MFS does not include the 4 
bytes of
   the VLAN header. Packets with VLAN header can be as large as MFS + 4. When
   double VLAN is enabled, the device adds 8 to the MFS for any packets.  This
   value has no effect on transmit frames; it is the responsibility of software 
to
   limit the size of transmit frames.

10G driver dpdk/drivers/net/ixgbe/ixgbe_ethdev.c:

   ixgbe_dev_mtu_set(struct rte_ethd_dev *dev, uint16_t mtu)
  uint32_t frame_size = mtu + ETHER_HDR_LEN + ETHER_CRC_LEN;  /* + 18 */
  ETHER_MAX_LEN = 1518

  /* switch to jumbo mode if needed */
  if (frame_size > ETHER_MAX_LEN) {
 dev->data->dev_conf.rxmode.jumbo_frame = 1;
 hlreg0 |= IXGBE_HLREG0_JUMBOEN;
  } else {
 dev->data->dev_conf.rxmode.jumbo_frame = 0;
 hlreg0 &= ~IXGBE_HLREG0_JUMBOEN;
  }
  IXGBE_WRITE_REG(hw, IXGBE_HLREG0, hlreg0);

  /* update max frame size */
  dev->data->dev_conf.rxmode.max_rx_pkt_len = frame_size;

  maxfrs = IXGBE_READ_REG(hw, IXGBE_MAXFRS);
  maxfrs &= 0x;
  maxfrs |= (dev->data->dev_conf.rxmode.max_rx_pkt_len << 16);
  IXGBE_WRITE_REG(hw, IXGBE_MAXFRS, maxfrs);

Ken Coulson
Software Engineer
509-242-9273
Ciena