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I wrote an XDP program in C that saves every packet, except some blocked ones, into a ring buffer map, which is sent to userspace. I also made an xdp_loader program in C++ that loads the XDP program ...
Roei's user avatar
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2 votes
1 answer
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BPF_LINK_CREATE with BPF_LINK_TYPE_XDP + target_ifindex returns -EINVAL on Ubuntu 24.04 HWE (6.14.0-36-generic, i40e). Documentation I’m trying to attach an XDP program to a NIC using BPF_LINK_CREATE ...
xpepermint's user avatar
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I have two namespaces, ns1 and ns2. I created two veth pairs and connected the namespaces to the host via these veth pairs. Now, I want to enable these two namespaces to ping each other using a very ...
1 vote
1 answer
54 views

I have a bound check statement that is optimized by clang and as a result verifier doesn't accept the program. I would like to write it using embedded assembly. I am not sure how to do it. I know that ...
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74 views

Does the igc driver support AF_XDP TX at all — even in copy mode? Has anyone successfully used AF_XDP with an Intel i225/i226 NIC using igc? Would really appreciate confirmation, success stories, or ...
2 votes
0 answers
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How sendto implemented for non-ZERO_COPY mode(native) for AF_XDP socket? here is my code for sending: //fill n packets xdp_desc[i]->addr = .... xdp_desc[i]->len = ... xsk_ring_prod__submit(&...
0 votes
1 answer
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In kernel based UDP server, we do bind to a address/port. For ebpf as I understand it I can just do filter the port in ebpf program rather than call bind. However some of the existing udp clients are ...
user2426361's user avatar
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1 answer
158 views

Here is the scene: When A iface uses bpf_redirect() to redirect data packets to B iface, will B's tc ingress be triggered?? When testing on my machine, I found that B's tc ingress bpf prog is not ...
light_rain's user avatar
1 vote
2 answers
128 views

I'm trying to explore using BPF arena in XDP programs. I learned from this post that XDP programs aren't sleepable and, therefore, they cannot use the kfunc to allocate BPF arenas' pages. So, my ...
pedro_m's user avatar
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2 votes
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I noticed that when I attach a dummy XDP program (that simply returns XDP_PASS) to the NIC driver, the single-core TCP throughput drops from 28 Gbps to 24 Gbps. Upon inspecting the CPU function stack ...
-1 votes
1 answer
109 views

I have a confusion about how the eBPF verifier behaves in my usecase. In general, I want to implement an eBPF program deployed from a python bcc module to look for my custom option 31 and remove it ...
0 votes
1 answer
161 views

I am trying to insert my new option field into packets using ebpf but I do not know what is the correct way to shift the rest of the payload after the IP header to the right without using a CONSTANT ...
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1 answer
129 views

Recently, I've been trying to work with BPF_ARENA. My objective is to use it on XDP programs. However, the following error appears when I try to use bpf_arena_alloc_pages: program must be sleepable ...
pedro_m's user avatar
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2 votes
1 answer
166 views

I want to use the kfunc bpf_xdp_metadata_rx_hash to get the flow hash in an XDP program as follows: #include "vmlinux.h" #include <bpf/bpf_helpers.h> extern int ...
1 vote
0 answers
108 views

I have the following program structure: src/main.bpf.c: #include "../vmlinux.h" #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> #include <bpf/bpf_endian.h> #...

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