Bug 1161861
| Summary: | alx can't send packet larger than 750 bytes | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Konrad Mosoń <mosonkonrad> |
| Component: | kernel | Assignee: | Kernel Maintainer List <kernel-maint> |
| Status: | CLOSED NOTABUG | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | high | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 20 | CC: | gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda, mchehab |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2014-11-10 10:35:42 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Sorry for trouble. I've managed to install tcpdump on Debian system. Packets arrives there so it's not problem with alx driver on my laptop. Looks more like hardware problem which occured at the same time I installed fedora. |
Description of problem: alx/ethernet card can't send packet larger than 750 bytes. Receiving works. Simple tested (using MTU 1500 - DEAFULT!): *** Works (packet size 750) **** (yeah, second system is debian, but i'm testing this from fedora with alx) morsik ~> printf "=%.0s" {1..698} | nc 10.42.0.173 22 SSH-2.0-OpenSSH_6.0p1 Debian-4+deb7u1 Ncat: Connection reset by peer. 16:30:30.553413 IP (tos 0x0, ttl 64, id 17133, offset 0, flags [DF], proto TCP (6), length 750) 10.42.0.1.60147 > 10.42.0.173.ssh: Flags [P.], cksum 0x44cc (correct), seq 1:699, ack 1, win 229, options [nop,nop,TS val 178983430 ecr 761911], length 698 E...B.@.@... *.. *........P.f.......D...... ......7========================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================== **** Hang (packet size 751) **** morsik ~> printf "=%.0s" {1..699} | nc 10.42.0.173 22 SSH-2.0-OpenSSH_6.0p1 Debian-4+deb7u1 16:31:15.426724 IP (tos 0x0, ttl 64, id 25273, offset 0, flags [DF], proto TCP (6), length 751) 10.42.0.1.60155 > 10.42.0.173.ssh: Flags [P.], cksum 0x39e1 (correct), seq 1:700, ack 40, win 229, options [nop,nop,TS val 179028304 ecr 772757], length 699 E...b.@.@..N *.. *......Vz.{..!I....9...... ..P....=========================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================== Second system (probably - i can't check cause i can't install tcpdump there because… my laptop with alx was router for that debian box and now network via alx doesn't works anymore :P) doesn't receive packet, cause my Fedora tried to resend TCP packet few times cause it things that remote system lost packet. Chaing MTU do 750 "fixes" this bug, but of course packet is smaller so it's less space for payload. Version-Release number of selected component (if applicable): kernel-3.16.6-203.fc20.x86_64 I reinstalled to Fedora from ArchLinux few days ago. On archlinux i had linux-3.16.4-1 which WORKED. How reproducible: Always. Steps to Reproduce: As above. Actual results: Packets don't reach destination. Expected results: Packets should reach destination without any problem Additional info: xwing.darkhouse ~> lspci -knn | grep -iA3 ether 02:00.0 Ethernet controller [0200]: Qualcomm Atheros AR8161 Gigabit Ethernet [1969:1091] (rev 08) Subsystem: Lenovo Device [17aa:3979] Kernel driver in use: alx Kernel modules: alx The system is sleeping from time to time! I'm writing this cause I read about some problems with sleeping on alx driver. But I've tried `rmmod alx; modprobe alx` after resume — didn't helped.