5.1 Running Ubuntu on a PS. Broadcom Stingray PS225

Broadcom Stingray PS225, a high-performance SmartNIC adapter, offers exceptional network and compute capabilities in a compact design. With dual 25GbE SFP28 ports, it delivers blazing-fast data transfer speeds. The PS225 is powered by an 8-core ARMv8 processor running at 3.0 GHz, providing unparalleled processing power for demanding network applications. It also features up to 16GB of DDR4 memory, ensuring smooth handling of complex tasks.

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PS225

User Guide

5 Setting Up a Linux Distribution rootfs on the PS225

This section describes how to set up a Linux distribution rootfs on the PS225.

Quick Start Guide

5.1 Running Ubuntu on a PS225

This section describes basic Ubuntu 16.04 setup on a PS225 board. It is assumed that an x86 host with Ubuntu 16.04 is being used. With small changes, it should apply to other variants as well.

NOTE:

Follow Upgrading the PS225 Software and successfully boot to Linux from the most recent SmartNIC release on the PS225.

5.1.1 Setting Up Ubuntu on a PS225

To set up Ubuntu on a PS225:

1. SSH to the PS225 card or use the serial console to access the PS225 Linux shell.

2. Create a new ext4 partition on the eMMC card. Ensure that the existing partitions used for UEFI (and yocto) are not deleted.

3. Run fdisk -l to verify the current partitions on

/dev/mmcblk0

If mmcblk0p5 is already created and it is 2 GB, skip Step 3 .

NOTE: mmcblk0p5 may have already been created during installation of the SmartNIC release.

NOTE:

In future releases, the partition layout may change. Check the release documentation before proceeding with

Step 4 and Step 5 .

4. Use the fdisk

command to create

/dev/mmcblk0p5

. Skip this step if it has already been completed. Refer to the following example command:

# boot normally, so from Yocto built kernel and RootFS root@bcm958802a8048c:~# fdisk /dev/mmcblk0

type 'n' to create a new partition

used defaults (will created mmcblk0p5)

typed 'w' to write changes

5. Format the partition using the following command: Broadcom

NOTE:

This step takes several minutes.

6. Mount the newly created partition to a directory of choice (for example, /mnt) using the following commands: root@bcm958802a8048c:~# mkdir /mnt/ubuntu root@bcm958802a8048c:~# mount /dev/mmcblk0p5 /mnt/ubuntu

7. Download the latest 16.04 ARM64 image from Ubuntu to the x86 host and untar it on the PS225. See the following commands:

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PS225

User Guide Quick Start Guide

NOTE:

Ensure that there is connectivity with the host (follow the

PS225 Quick Start Guide

in Table 1 for additional details).

a. On the host, download the Ubuntu image with the following commands: byang@byang-PowerEdge-2950:~$ wget http://cloud-images.ubuntu.com/releases/16.04/release/ubuntu-

16.04-server-cloudimg-arm64-root.tar.xz b. Ensure connectivity between host and PS225 with the following commands (see the

PS225 Quick Start Guid e in

Table 1 ): byang@byang-PowerEdge-2950:~$ sudo insmod ~/temp/bnxt_en-1.8.29/bnxt_en.ko byang@byang-PowerEdge-2950:~$ sudo ifconfig enp8s0f0 192.168.1.20 up ; ping 192.168.1.10

Pinging 192.168.1.10 with 32 bytes of data:

Reply from 192.168.1.10: bytes=32 time=1ms TTL=128

Ping statistics for 192.168.1.10:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 1ms, Maximum = 1ms, Average = 1ms c. On the PS225, scp the Ubuntu image with the following command: root@bcm958802a8048c:~#

Confidential root@bcm958802a8048c:~# date -s "14 MAR 2018 20:00:00" root@bcm958802a8048c:~# cd /mnt/ubuntu root@bcm958802a8048c: /mnt/ubuntu# tar --numeric-owner -xf /mnt/ubuntu/ubuntu-16.04-servercloudimg-arm64-root.tar.xz

8. The new rootfs is extracted in the specified partition (in the example above

/dev/mmcblk0p5

). chroot

to the device to set up several items before the kernel boots that rootfs for the first time. This step is important, otherwise the Ubuntu

OS does not boot properly. See the following commands: a. Copy the bnxt* modules from the yocto filesystem to the ubuntu rootfs with the following command: Broadcom root@bcm958802a8048c: /mnt/ubuntu# chroot /mnt/ubuntu c. Remove cloud init from this prebuilt image (since it interferes with normal boot) with the following command:

\u@\h:\w$ dpkg --purge cloud-init d. Add getty for ttyS0 with the following commands:

\u@\h:\w$ cp /etc/init/ttyAMA0.conf /etc/init/ttyS0.conf

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Quick Start Guide

PS225

User Guide

\u@\h:\w$ sed 's/ttyAMA0/ttyS0/g' -i /etc/init/ttyS0.conf

e. Set up the user lab with the following commands:

\u@\h:\w$ adduser lab f. Enter the user name and password information.

g. Add the user lab to admin and sudo groups with the following commands:

\u@\h:\w$ addgroup lab admin

\u@\h:\w$ addgroup lab sudo

\u@\h:\w$ exit

9. Unmount the device, reboot, and stop at the UEFI prompt: root@bcm958802a8048c: /mnt/ubuntu# cd /mnt root@bcm958802a8048c: /mnt# umount /mnt/ubuntu root@bcm958802a8048c: /mnt# reboot

10. The system is now ready to boot the new Ubuntu rootfs, however, the new rootfs to be used by kernel must be specified.

The UEFI must use Ubuntu rootfs for boot. The UEFI then sets up Linux args automatically. See the following commands:

Press any key within 5 seconds

AUTOBOOT SKIPPED

Shell> gpt list blk0

Shell> select rootfs-ordinal 5

Shell> select

Shell> startup

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The login prompt and username/password that was set up above is now available. This may take several minutes to get to the login prompt. See the following commands:

NOTE:

It is possible to switch back to yocto Linux by performing the following using the UEFI.

Shell> select rootfs-ordinal 3

Shell> startup

11. Acquire network connectivity with host using the following commands:

NOTE:

Broadcom a. On the PS225 console, (optionally) get rid of the warning "sudo: unable to resolve host ubuntu: Connection refused" by editing /etc/hosts, and add the following line (in blue): lab@ubuntu:/$ sudo nano /etc/hosts

127.0.0.1 localhost

127.0.1.1 ubuntu b. Continue to load the driver and setup the network interface as follows: lab@ubuntu:~$ sudo depmod -a # apply only at the very first boot

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Quick Start Guide

PS225

User Guide lab@ubuntu:~$ sudo modprobe bnxt_en lab@ubuntu:~$ ifconfig -a

Note the name of the interface slot that is plugged into the PS225. lab@ubuntu:/$ sudo ifconfig enP8p1s0f0np0 up 192.168.1.10 c. On the host, insmod the bnxt_en.ko module. See the PS225 Quick Start Guide to find out where to get/build this module for the x86 host. The following command operates on the example setup. byang@byang-PowerEdge-2950:~$ sudo insmod ~/temp/bnxt_en-1.8.29/bnxt_en.ko byang@byang-PowerEdge-2950:~$ sudo ifconfig enp8s0f0 192.168.1.20 up ; ping 192.168.1.10

d. Access between the host and PS225 should be now available.

12. Allow the PS225 to reach the Internet, so the user can use apt install to retrieve software from the Internet. We configure the host to forward using the following commands:

NOTE:

If your PS225's SFP28 port is connected to the Internet (for example, via a switch and DHCP server), then there is no need for host to forward Internet traffic. Skip the following steps.

NOTE:

"eno2" is the regular Ethernet interface that the host uses to access the Internet while enp8s0f0 is the first PF towards the PS225 card. On different machines these could be different. Adjust the commands based on the specific setup.

a. On the example host, the result from ifconfig is as follows: byang@byang-PowerEdge-2950:

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inet6 addr: fe80::116e:caa:13f3:1dbf/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:23392 errors:0 dropped:0 overruns:0 frame:0

TX packets:16471 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:2509414 (2.5 MB) TX bytes:2926607 (2.9 MB) enp8s0f0 Link encap:Ethernet HWaddr 00:10:18:ad:05:08

inet addr:192.168.1.20 Bcast:192.168.1.255 Mask:255.255.255.0

inet6 addr: fe80::210:18ff:fead:508/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1661 errors:0 dropped:0 overruns:0 frame:0

Broadcom enp8s0f2 Link encap:Ethernet HWaddr 00:10:18:ad:05:0a

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1183 errors:0 dropped:0 overruns:0 frame:0

TX packets:1321 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:381443 (381.4 KB) TX bytes:271592 (271.5 KB) enp8s0f4 Link encap:Ethernet HWaddr 00:10:18:ad:05:0c

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1186 errors:0 dropped:0 overruns:0 frame:0

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User Guide Quick Start Guide

TX packets:1307 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:382936 (382.9 KB) TX bytes:267866 (267.8 KB) enp8s0f6 Link encap:Ethernet HWaddr 00:10:18:ad:05:0e

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1174 errors:0 dropped:0 overruns:0 frame:0

TX packets:1315 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:378828 (378.8 KB) TX bytes:270156 (270.1 KB) enp8s0f1d1 Link encap:Ethernet HWaddr 00:10:18:ad:05:09

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:189 errors:0 dropped:0 overruns:0 frame:0

TX packets:1312 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:65394 (65.3 KB) TX bytes:270596 (270.5 KB) enp8s0f3d1 Link encap:Ethernet HWaddr 00:10:18:ad:05:0b

UP BROADCAST MULTICAST MTU:1500 Metric:1

RX packets:437 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:151202 (151.2 KB) TX bytes:0 (0.0 B) enp8s0f5d1 Link encap:Ethernet HWaddr 00:10:18:ad:05:0d

UP BROADCAST MULTICAST MTU:1500 Metric:1

RX packets:437 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

Confidential enp8s0f7d1 Link encap:Ethernet HWaddr 00:10:18:ad:05:0f

UP BROADCAST MULTICAST MTU:1500 Metric:1

RX packets:437 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:151202 (151.2 KB) TX bytes:0 (0.0 B) lo Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

inet6 addr: ::1/128 Scope:Host

UP LOOPBACK RUNNING MTU:65536 Metric:1

RX packets:2002 errors:0 dropped:0 overruns:0 frame:0 Broadcom b. On the host (assuming that it is Ubuntu 16), ensure that it is changed based on the distribution. c. Edit

/etc/sysctl.conf

and uncomment the following line: net.ipv4.ip_forward=1 byang@byang-PowerEdge-2950:~$ sudo iptables -t nat -A POSTROUTING -o eno2 -j MASQUERADE byang@byang-PowerEdge-2950:~$ sudo iptables -A FORWARD -i eno2 -o enp8s0f0 -m state --state

RELATED,ESTABLISHED -j ACCEPT byang@byang-PowerEdge-2950:~$ sudo iptables -A FORWARD -i enp8s0f0 -o eno2 -j ACCEPT d. On PS225, configure default gateway and DNS server with the following commands:

Broadcom Confidential 5880X-PS225-UG101

PS225

User Guide Quick Start Guide lab@ubuntu:/$ sudo route add default gw 192.168.1.20

lab@ubuntu:/$ sudo nano /etc/resolvconf/resolv.conf.d/head e. Add the following line to /etc/resolvconf/resolv.conf.d/head: nameserver 8.8.8.8 lab@ubuntu:/$ sudo resolvconf -u f. Test it by pinging Google: lab@ubuntu:/$ ping google.com g. Install something useful with the apt command: lab@ubuntu:/$ sudo apt update

Install gcc, for example. lab@ubuntu:/$ sudo apt install gcc lab@ubuntu:~$ sudo su root@ubuntu:~$ sed 's/PasswordAuthentication/# PasswordAuthentication/g' -i /etc/ssh/sshd_config root@ubuntu:/home/lab# dpkg-reconfigure openssh-server h. On the host, SSH from the host to the PS225 using the following command: byang@byang-PowerEdge-2950:~$ ssh [email protected]

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Broadcom

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PS225

User Guide Quick Start Guide

5.2 Running CentOS on a PS225

This section describes basic CentOS 7 setup on a PS225 board. It is assumed that an x86 host with Ubuntu 16.04 is being used. With small changes, it should apply to other variants as well.

NOTE:

Follow Upgrading the PS225 Software and successfully boot to Linux from the most recent SmartNIC release on the PS225.

5.2.1 Setting Up CentOS on the PS225

To set up CentOS on the PS225:

1. SSH to the PS225 card or use the serial console to access the PS225 Linux shell.

2. Create a new ext4 partition on the eMMC card.

CAUTION!

Ensure that the existing partitions used for UEFI (and Yocto) are not deleted.

If mmcblk0p5 is already created and it is 2 GB, skip Step 3 . mmcblk0p5 is already created during the installation of GA

1.0.3.

NOTE:

In future releases, the partition layout may change. Check the release documentation before proceeding with

Step 4 and Step 5 .

3. Run fdisk -l

to verify the current partitions on

/dev/mmcblk0

4. Create

/dev/mmcblk0p5

with the following fdisk

command. Skip this step if this has already been done.

root@bcm958802a8048c:~# fdisk /dev/mmcblk0

type 'n' to create a new partition

used defaults (will created mmcblk0p5)

typed 'w' to write changes

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5. Format the partition with the following command: root@bcm958802a8048c:~# mkfs.ext4 /dev/mmcblk0p5

NOTE:

This step can take several minutes to complete.

6. Mount the newly created partition to a directory of choice with the following command (for example. /mnt): root@bcm958802a8048c:~# mkdir /mnt/centos Broadcom connectivity with the host (see the PS225 Quick Start Guide for additional details).

a. Download the image with the following command: byang@byang-PowerEdge-2950: ~$wget http://mirror.centos.org/altarch/7/isos/aarch64/CentOS-7aarch64-rootfs-7.4.1708.tar.xz b. Ensure connectivity with the host and PS225 with the following commands: byang@byang-PowerEdge-2950:~$ sudo insmod ~/temp/bnxt_en-1.8.29/bnxt_en.ko byang@byang-PowerEdge-2950:~$ sudo ifconfig enp8s0f0 192.168.1.20 up ; ping 192.168.1.10

c. On the PS225, SCP the CentOS image with the following command: cd /mnt/centos

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PS225

User Guide Quick Start Guide root@bcm958802a8048c:/mnt/centos# scp [email protected]:~/CentOS-7-aarch64-rootfs-

7.4.1708.tar.xz

root@bcm958802a8048c:/mnt/centos# tar --numeric-owner -xf CentOS-7-aarch64-rootfs-

7.4.1708.tar.xz

d. Free up space with the following command: root@bcm958802a8048c:/mnt/centos# rm CentOS-7-aarch64-rootfs-7.4.1708.tar.xz

8. With the new rootfs extracted in the specified partition (in the example,

/dev/mmcblk0p5

), chroot to the device to set up the device before the kernel boots that rootfs for the first time. This step is important, otherwise the Ubuntu OS will not boot properly.

a. Copy the bnxt* modules from the Yocto filesystem to the ubuntu rootfs with the following command: cp -r /lib/modules/`uname -r` lib/modules b. Switch to CentOS's filesystem through chroot with the following commands: chroot /mnt/centos adduser lab passwd lab gpasswd -a lab wheel exit cd umount /mnt/centos reboot

9. Unmount the device and stop at the UEFI prompt:

NOTE:

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Press any key within 5 seconds

AUTOBOOT SKIPPED

Shell> gpt list blk0

Shell> select rootfs-ordinal 5

Shell> select

Shell> startup

At this point, it is possible to reach the login prompt and log in with the username/password that was created in the previous steps. It may take a few minutes to reach the login prompt.

NOTE:

Broadcom startup

10. Provide connectivity to the host using the following steps: a. Install modules copied in Step 8 , Step a .

NOTE:

If the insmod'ed bnxt_en.ko module in Yocto Linux has been previously installed, power cycle the system and try again.

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Quick Start Guide

PS225

User Guide b. On the PS225 console, run the following commands:

[lab@localhost ~] $ sudo depmod -a # apply only at the very first boot

[lab@localhost ~] $ sudo modprobe bnxt_en.

11. On the PS225, edit

/etc/sysconfig/network-scripts/ifcfg-enP8p1s0f0np0

and add the following lines:

DEVICE= enP8p1s0f0np0

GATEWAY=192.168.1.20

IPADDR=192.168.1.10

NETMASK=255.255.255.0

DNS1=8.8.8.8

[lab@localhost ~] $ sudo ifup enP8p1s0f0np0

[lab@localhost ~] $ sudo ip addr show a. On the host, insmod to bnxt_en.ko

module using the following commands (see the PS225 Quick Start Guide for information on building this module on a x86 host): sudo insmod ~/temp/bnxt_en-1.8.29/bnxt_en.ko sudo ifconfig enp8s0f0 192.168.1.20 up ; ping 192.168.1.10

b. The ping to the PS225 board should be successful. SSH and SCP between the host and the PS225 with the following command:

# ssh [email protected]

12. All the PS225s must be able to access the Internet so that the yum install software from the Internet.

command can be used to retrieve the

NOTE:

The results of ifconfig on the host are as follows:

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NOTE:

Eno2 is the regular Ethernet interface that the host uses to access the Internet while enp8s0f0 is the first PF towards the PS225 card. On different systems these items could be different. Adjust these items based on your setup.

byang@byang-PowerEdge-2950: ~/temp/bnxt_en-1.8.29$ ifconfig eno2 Link encap:Ethernet HWaddr 00:22:19:91:7c:e4

inet addr:10.67.93.199 Bcast:10.67.93.255 Mask:255.255.254.0

inet6 addr: fe80::116e:caa:13f3:1dbf/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Broadcom

RX bytes:2509414 (2.5 MB) TX bytes:2926607 (2.9 MB) enp8s0f0 Link encap:Ethernet HWaddr 00:10:18:ad:05:08

inet addr:192.168.1.20 Bcast:192.168.1.255 Mask:255.255.255.0

inet6 addr: fe80::210:18ff:fead:508/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1661 errors:0 dropped:0 overruns:0 frame:0

TX packets:344 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:481235 (481.2 KB) TX bytes:32437 (32.4 KB)

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User Guide enp8s0f2 Link encap:Ethernet HWaddr 00:10:18:ad:05:0a

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1183 errors:0 dropped:0 overruns:0 frame:0

TX packets:1321 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:381443 (381.4 KB) TX bytes:271592 (271.5 KB) enp8s0f4 Link encap:Ethernet HWaddr 00:10:18:ad:05:0c

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1186 errors:0 dropped:0 overruns:0 frame:0

TX packets:1307 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:382936 (382.9 KB) TX bytes:267866 (267.8 KB) enp8s0f6 Link encap:Ethernet HWaddr 00:10:18:ad:05:0e

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1174 errors:0 dropped:0 overruns:0 frame:0

TX packets:1315 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:378828 (378.8 KB) TX bytes:270156 (270.1 KB) enp8s0f1d1 Link encap:Ethernet HWaddr 00:10:18:ad:05:09

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:189 errors:0 dropped:0 overruns:0 frame:0

TX packets:1312 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:65394 (65.3 KB) TX bytes:270596 (270.5 KB) enp8s0f3d1 Link encap:Ethernet HWaddr 00:10:18:ad:05:0b Confidential

collisions:0 txqueuelen:1000

RX bytes:151202 (151.2 KB) TX bytes:0 (0.0 B) enp8s0f5d1 Link encap:Ethernet HWaddr 00:10:18:ad:05:0d

UP BROADCAST MULTICAST MTU:1500 Metric:1

RX packets:437 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:151202 (151.2 KB) TX bytes:0 (0.0 B) enp8s0f7d1 Link encap:Ethernet HWaddr 00:10:18:ad:05:0f

UP BROADCAST MULTICAST MTU:1500 Metric:1 Broadcom

RX bytes:151202 (151.2 KB) TX bytes:0 (0.0 B) lo Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

inet6 addr: ::1/128 Scope:Host

UP LOOPBACK RUNNING MTU:65536 Metric:1

RX packets:2002 errors:0 dropped:0 overruns:0 frame:0

TX packets:2002 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:170071 (170.0 KB) TX bytes:170071 (170.0 KB)

Quick Start Guide

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User Guide

13. On the host (assume it is Ubuntu 16), ensure that the change is based on your distribution.

14. Edit

/etc/sysctl.conf and uncomment the following line:

Quick Start Guide net.ipv4.ip_forward=1 byang@byang-PowerEdge-2950:~$ sudo iptables -t nat -A POSTROUTING -o eno2 -j MASQUERADE byang@byang-PowerEdge-2950:~$ sudo iptables -A FORWARD -i eno2 -o enp8s0f0 -m state --state

RELATED,ESTABLISHED -j ACCEPT byang@byang-PowerEdge-2950:~$ sudo iptables -A FORWARD -i enp8s0f0 -o eno2 -j ACCEPT

15. Test the configuration by accessing www.google.com.

lab@ubuntu:/$ ping google.com

Broadcom

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Broadcom Confidential 5880X-PS225-UG101

नमस्ते! मैं एक एआई चैटबॉट हूं जिसे विशेष रूप से 5.1 Running Ubuntu on a PS. Broadcom Stingray PS225 के साथ आपकी सहायता करने के लिए प्रशिक्षित किया गया है. मैंने दस्तावेज़ की अच्छी तरह से समीक्षा की है और आपको आवश्यक सटीक जानकारी का पता लगाने या स्पष्ट और सरल शब्दों में सामग्री को समझाने में मदद कर सकता हूं. चाहे आप विशिष्ट सुविधाओं, समस्या निवारण चरणों या सामान्य उपयोग पर मार्गदर्शन की तलाश कर रहे हों, अपने प्रश्न पूछने के लिए स्वतंत्र महसूस करें. आप अपनी चिंताओं या जरूरतों के बारे में जितनी अधिक जानकारी प्रदान करेंगे, उतनी ही सटीक और प्रभावी ढंग से मैं आपकी सहायता कर सकता हूं!