<mauricio.vasquez@...> wrote: Order the declaration based on reverse Christmas tree shape.

<mauricio.vasquez@...> wrote: It is totally up to you, but you could replace the above licensing portion from "This program" to 'more details" with /* SPDX-License-Identifier: GPL-2.0

The example is made by two parts, a eBPF program that consumes elements from a FIFO queue and prints them in the screen and a user space application that inserts new elements into the queue each time

Signed-off-by: Mauricio Vasquez B <mauricio.vasquez@...> --- tools/include/uapi/linux/bpf.h | 5 ++ tools/testing/selftests/bpf/test_maps.c | 72 +++++++++++++++++++++++++++++++ 2

Bpf queue implements a LIFO/FIFO data containers for ebpf programs. It allows to push an element to the queue by using the update operation and to pop an element from the queue by using the lookup

Bpf queue map is a new kind of map that provides a LIFO/FIFO queue implementation. In some applications, like a SNAT, it is necessary to keep track of a pool of free elemenets, network ports in this

Hi All, Just tested the code last night, and it did not work. Now I have fixed it and tested in a container, it's finally working except for the the device major and minor info. Here is the updated

Hi, I have resumed work on issue https://github.com/iovisor/bcc/issues/1329. I just added the needed fields in this helper structure and also I updated the bcc code to use this helper, but I have a

Hi All, Thanks for dialing in today. As usual, here are my notes. Cheers! -Brenden === Discussion === Brenden: * f28 and ubuntu18.04 support * 0.6.1 tagged with those packages * will try to get

Please join us tomorrow for our bi-weekly call. As usual, this meeting is open to everybody and completely optional. You might be interested to join if: You want to know what is going on in BPF

There is no skb in XDP. The helper bpf_l4_csum_replace cannot be used. You need to use other csum functions and can directly modify the packet data.

It is a piece of complicated software, let me see how much I can do. Yes, it is `#pragma unroll`. Not 100% whether just frame pointers are enough for you or not. Remeber, on the stack, typically

Then in this case is it possible to replace TCP checksum on ingress with XDP? How do I test if the skb is writable?

Can you share it with me? Maybe I can use it as an example. I have never used pragma unroll before, but I understand what it is supposed to do. Quick search gives me usages for CUDA and several

bpf_csum_diff only accesses packet data and can be used in both cls_act and xdp. bpf_l4_csum_replace accesses skb data structure, e.g., it needs to replace the csum and hence needs to test whether skb

I was thinking maybe those helpers were not available because no skb was construct. But after checking, the helper you're mentionning is in the tc_cls. Also, the csum_diff helper lies in the same

XDP programs cannot use bpf_l4_csum_replace, but they can use bpf_csum_diff since commit 205c380 ("bpf: add csum_diff helper to xdp as well") which landed in v4.16-rc1. The list of helpers available

Hi I am writing a bpf program for packet processing and have loaded my ingress function at BPF.XDP. I'm updating the destination IPv6 address and want to update the TCP checksum, but when I try to

We did not have such an example in BCC. In Facebook, we have a bpf program to catch stack traces for python programs. It is very similar to what you want to achieve in the above. Basically, you need

Hi! Imagine I have an interpreter that runs some program in some custom language. If I were to get a stack trace, it would look like: sys_read()