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Bug 2045594

Summary: NIC driver (st_gmac) requires 'swiotlb=65536' on kernel command line
Product: Red Hat Enterprise Linux 9 Reporter: Mark Salter <msalter>
Component: kernelAssignee: Mark Salter <msalter>
kernel sub component: NIC Drivers QA Contact: Dipali <dipatel>
Status: CLOSED ERRATA Docs Contact:
Severity: high    
Priority: unspecified CC: acaringi, ailin.xu, darcari, dipatel, kzhang, linville, msalter, network-qe, pragyansri.pathi, pusethi, tizhao, vee.khee.wong, xiaolong.wang
Version: 9.0Keywords: Triaged
Target Milestone: rcFlags: pm-rhel: mirror+
Target Release: 9.0   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: kernel-5.14.0-70.el9 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: 1989540 Environment:
Last Closed: 2022-05-17 15:44:56 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:

Description Mark Salter 2022-01-25 18:03:22 UTC 
+++ This bug was initially created as a clone of Bug #1989540 +++

Description of problem:

Without adding 'swiotlb=65536' on certain Intel platforms neither RHEL or an
upstream kernel is able to bring both stmmac interfaces online.  The following
errors are noted:

[   14.858941] intel-eth-pci 0000:00:1d.1: swiotlb buffer is full (sz: 346 bytes), total 32768 (slots), used 32768
 (slots)
[   14.869921] intel-eth-pci 0000:00:1d.1 enp0s29f1: Tx DMA map failed
[   14.879022] intel-eth-pci 0000:00:1d.1: swiotlb buffer is full (sz: 90 bytes), total 32768 (slots), used 32768 
(slots)
[   14.889909] intel-eth-pci 0000:00:1d.1 enp0s29f1: Tx DMA map failed
[   14.891756] intel-eth-pci 0000:00:1d.2 enp0s29f2: Link is Up - 100Mbps/Full - flow control rx/tx
[   14.933469] intel-eth-pci 0000:00:1d.2: swiotlb buffer is full (sz: 346 bytes), total 32768 (slots), used 32768
 (slots)
[   14.944454] intel-eth-pci 0000:00:1d.2 enp0s29f2: Tx DMA map failed
[   14.953957] intel-eth-pci 0000:00:1d.2: swiotlb buffer is full (sz: 90 bytes), total 32768 (slots), used 32768 

<snip>

Version-Release number of selected component (if applicable):

RHEL8.5, upstream 5.13


How reproducible:

100%

Steps to Reproduce:
1. Boot system


There is an upstream fix for this issue, so we should bring it into RHEL9:

884d2b845477 net: stmmac: Add GFP_DMA32 for rx buffers if no 64 capability
Comment 5 Dipali 2022-02-24 19:47:09 UTC 
verified fix on kernel 5.14.0-55.mr484_220205_1705.el9.x86_64. 

#dmesg 
no errors are seen for swiotlb.
Comment 11 Dipali 2022-02-28 19:30:46 UTC 
@David Acari - I wanted to use intel-elkhartlake-02.ml3.eng.bos.redhat.com for verifying this bug. Can you set it up ?

Thanks.
-Dipali
Comment 13 Dipali 2022-03-01 16:14:51 UTC 
Verified kernel 5.14.0-70.el9.x86_64 for no swiotlb errors in dmesg

cat /proc/cmdline
BOOT_IMAGE=(hd0,gpt2)/vmlinuz-5.14.0-70.el9.x86_64 root=/dev/mapper/cs_intel--elkhartlake--02-root ro rd.lvm.lv=cs_intel-elkhartlake-02/root rd.lvm.lv=cs_intel-elkhartlake-02/swap console=ttyS0,115200n81


# dmesg | grep swiotlb
#


[root@intel-elkhartlake-02 ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp0s29f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 98:4f:ee:16:11:99 brd ff:ff:ff:ff:ff:ff
    inet 10.19.182.147/21 brd 10.19.183.255 scope global dynamic noprefixroute enp0s29f1
       valid_lft 60214sec preferred_lft 60214sec
    inet6 2620:52:0:13b0:9a4f:eeff:fe16:1199/64 scope global dynamic noprefixroute 
       valid_lft 2591880sec preferred_lft 604680sec
    inet6 fe80::9a4f:eeff:fe16:1199/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
3: enp0s29f2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 98:4f:ee:16:11:9a brd ff:ff:ff:ff:ff:ff
    inet 10.19.182.106/21 brd 10.19.183.255 scope global dynamic noprefixroute enp0s29f2
       valid_lft 72075sec preferred_lft 72075sec
    inet6 2620:52:0:13b0:9a4f:eeff:fe16:119a/64 scope global dynamic noprefixroute 
       valid_lft 2591880sec preferred_lft 604680sec
    inet6 fe80::9a4f:eeff:fe16:119a/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
4: enp0s30f4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 98:4f:ee:16:11:9b brd ff:ff:ff:ff:ff:ff
    inet 10.19.177.19/21 brd 10.19.183.255 scope global dynamic noprefixroute enp0s30f4
       valid_lft 17012sec preferred_lft 17012sec
    inet6 2620:52:0:13b0:9a4f:eeff:fe16:119b/64 scope global dynamic noprefixroute 
       valid_lft 2591880sec preferred_lft 604680sec
    inet6 fe80::9a4f:eeff:fe16:119b/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

No errors are seen, setting to Verified
Comment 15 errata-xmlrpc 2022-05-17 15:44:56 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (new packages: kernel), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:3907