Hi Stanislav, I debug it further. Here are the steps
1> In my config I am creating a veth interface in kernel 2> for that interface I am creating a hostif interface using "create host-interface name <NAME>" 3> This intern create 4 fds in "show unix files" 4> [image: image.png] 5> I think this 59 fd is fd of af_packet socket for hostif. Correct me if I am wrong. 6> but I don't see any inode entry for it in /proc/<PID>/fd 7> So according to my understanding for other tap creation it tries to take 59 as free fd and allocate 8> that happens to be in bvi tap interface creation 9> and that causes traffic flow issues. Do you see its a valid analysis? Please provide your comments and let me know your thoughts on this. Thanks, Pragya On Tue, Feb 28, 2023 at 4:13 PM Pragya Nand Bhagat via lists.fd.io <pragya.nand.bhagat.1=gmail....@lists.fd.io> wrote: > Hi Stanislav, > > Thanks for the response. > Please find the response inline > > > Do you see any errors in `show log`? > >>>>[Pragya] No I don't see any error log > > Do you see this fd 59 in `show unix files`? > >>>>[Pragya] Yes, I can see 59 in show unix files > "show unix files" fetch the fd from "/proc/self/fd/" > but if we go and see /proc/<pid>/fd we don't see any file inode being > created. > > So according to OS 59 is never assigned and for subsequent interface > creation it try to have that same tap fd which is 59 here. > I think that causes the issue where the traffic flow is not OK. > > Can you suggest how I can debug and address this issue? > > Thanks, > Pragya > > > On Fri, Feb 24, 2023 at 3:24 PM Stanislav Zaikin <zsta...@gmail.com> > wrote: > >> Hello Pragya, >> >> Do you see any errors in `show log`? >> Do you see this fd 59 in `show unix files`? >> >> On Fri, 24 Feb 2023 at 07:59, Pragya Nand Bhagat < >> pragya.nand.bhaga...@gmail.com> wrote: >> >>> Hi All, >>> >>> I'm using an older version of vpp 20.09 . >>> When I create a bvi interface using bvi create cli. >>> A corresponding tap is created with same name as follows: >>> >>> >>> >>> *itf-pair: [19] bvi100 tap-39-bvi100 bvi100 960 type tap * >>> >>> But one FD of the tap interface is *missing* when I check in linux. >>> >>> vpp# *show tap tap-39-bvi100* >>> >>> Interface: tap-39-bvi100 (ifindex 40) >>> >>> name "bvi100" >>> >>> host-ns "(nil)" >>> >>> host-mac-addr: e4:43:4b:21:f3:86 >>> >>> *vhost-fds 213 214* >>> >>> * tap-fds 59* >>> >>> gso-enabled 0 >>> >>> csum-enabled 0 >>> >>> >>> In above output there should be 3 FDs associated with the tap but* one >>> of them is missing.* >>> >>> [root@0-9 /]# ls -l /proc/37/fd | grep 59 >>> >>> lrwx------ 1 root root 64 Feb 23 12:03 159 -> /dev/vhost-net >>> >>> *FD 59 is missing*, as a result of which packet transfer between linux >>> and mdp is not happening. >>> >>> Is there some checkin/patch to fix this issue? >>> Any help in debugging this issue will be helpful . >>> >>> Thanks >>> Pragya Nand >>> >>> >>> >>> >> >> -- >> Best regards >> Stanislav Zaikin >> >> >> >> > > >
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