[DPDK/other Bug 1825] The DPDK memif driver fails to connect a second zero-copy client port from the same process, logging an "mmap failed: No such device" error.

[bugzilla@dpdk.org]

http://bugs.dpdk.org/show_bug.cgi?id=1825

            Bug ID: 1825
           Summary: The DPDK memif driver fails to connect a second
                    zero-copy client port from the same process, logging
                    an "mmap failed: No such device" error.
           Product: DPDK
           Version: 23.11
          Hardware: All
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: other
          Assignee: dev@dpdk.org
          Reporter: staryyuuwx@gmail.com
  Target Milestone: ---

Linux localhost 5.10.0-136.12.0.86.h1032.eulerosv2r12.aarch64 #1 SMP Wed Jun 28
18:34:50 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux

1. start two server memifs
./dpdk-testpmd -l 1-2 --file-prefix=pmd1
--vdev=net_memif0,socket=/run/memif_wx0,role=server
--vdev=net_memif1,socket=/run/memif_wx1,role=server -- -i

2. start one client memif
./dpdk-testpmd -l 3-4 -m 4096 --file-prefix=pmd2
--vdev=net_memif0,socket=/run/memif_wx0,role=client,zero-copy=yes
--single-file-segments -- -i

port 0 is up
testpmd> show port info 0

********************* Infos for port 0  *********************
MAC address: 72:5C:61:5A:E9:75
Device name: net_memif0
Driver name: net_memif
Firmware-version: not available
Devargs: socket=/run/memif_wx0,role=client,zero-copy=yes
Connect to socket: 0
memory allocation on the socket: 0
Link status: up
Link speed: 100 Gbps
Link duplex: full-duplex
......

3. add and start 2nd client memif, print "mmap failed: No such device"
client:
testpmd> port attach net_memif1,socket=/run/memif_wx1,role=client,zero-copy=yes
Attaching a new port...
Port 1 is attached. Now total ports is 2
Done
testpmd> port start 1
Configuring Port 1 (socket 0)
Port 1: 96:75:EE:3F:B7:AA
Checking link statuses...
Done

server:
testpmd> memif_connect(): mmap failed: No such device
testpmd> show port info 1

********************* Infos for port 1  *********************
MAC address: C6:84:F6:36:9F:72
Device name: net_memif1
Driver name: net_memif
Firmware-version: not available
Devargs: socket=/run/memif_wx1,role=server
Connect to socket: 0
memory allocation on the socket: 0
Link status: down
Link speed: 100 Gbps
Link duplex: full-duplex
Autoneg status: On

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