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samples/bpf: Add new sample xsk_fwd.c 

This sample code illustrates the packet forwarding between multiple
AF_XDP sockets in multi-threading environment. All the threads and
sockets are sharing a common buffer pool, with each socket having
its own private buffer cache. The sockets are created with the
xsk_socket__create_shared() function, which allows multiple AF_XDP
sockets to share the same UMEM object.

Example 1: Single thread handling two sockets. Packets received
from socket A (on top of interface IFA, queue QA) are forwarded
to socket B (on top of interface IFB, queue QB) and vice-versa.
The thread is affinitized to CPU core C:

./xsk_fwd -i IFA -q QA -i IFB -q QB -c C

Example 2: Two threads, each handling two sockets. Packets from
socket A are sent to socket B (by thread X), packets
from socket B are sent to socket A (by thread X); packets from
socket C are sent to socket D (by thread Y), packets from socket
D are sent to socket C (by thread Y). The two threads are bound
to CPU cores CX and CY:

./xdp_fwd -i IFA -q QA -i IFB -q QB -i IFC -q QC -i IFD -q QD -c CX -c CY

Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Link: https://lore.kernel.org/bpf/1598603189-32145-15-git-send-email-magnus.karlsson@intel.com
This commit is contained in:
Cristian Dumitrescu 2020-08-28 10:26:28 +02:00 committed by Daniel Borkmann
parent 2f6324a393
commit 35149b2c04
2 changed files with 1088 additions and 0 deletions
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3
samples/bpf/Makefile
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@ -48,6 +48,7 @@ tprogs-y += syscall_tp
tprogs-y += cpustat tprogs-y += cpustat
tprogs-y += xdp_adjust_tail tprogs-y += xdp_adjust_tail
tprogs-y += xdpsock tprogs-y += xdpsock
tprogs-y += xsk_fwd
tprogs-y += xdp_fwd tprogs-y += xdp_fwd
tprogs-y += task_fd_query tprogs-y += task_fd_query
tprogs-y += xdp_sample_pkts tprogs-y += xdp_sample_pkts
@ -104,6 +105,7 @@ syscall_tp-objs := syscall_tp_user.o
cpustat-objs := cpustat_user.o cpustat-objs := cpustat_user.o
xdp_adjust_tail-objs := xdp_adjust_tail_user.o xdp_adjust_tail-objs := xdp_adjust_tail_user.o
xdpsock-objs := xdpsock_user.o xdpsock-objs := xdpsock_user.o
xsk_fwd-objs := xsk_fwd.o
xdp_fwd-objs := xdp_fwd_user.o xdp_fwd-objs := xdp_fwd_user.o
task_fd_query-objs := bpf_load.o task_fd_query_user.o $(TRACE_HELPERS) task_fd_query-objs := bpf_load.o task_fd_query_user.o $(TRACE_HELPERS)
xdp_sample_pkts-objs := xdp_sample_pkts_user.o $(TRACE_HELPERS) xdp_sample_pkts-objs := xdp_sample_pkts_user.o $(TRACE_HELPERS)
@ -203,6 +205,7 @@ TPROGLDLIBS_trace_output += -lrt
TPROGLDLIBS_map_perf_test += -lrt TPROGLDLIBS_map_perf_test += -lrt
TPROGLDLIBS_test_overhead += -lrt TPROGLDLIBS_test_overhead += -lrt
TPROGLDLIBS_xdpsock += -pthread TPROGLDLIBS_xdpsock += -pthread
TPROGLDLIBS_xsk_fwd += -pthread
# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline: # Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
# make M=samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang # make M=samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang

1085
samples/bpf/xsk_fwd.c Normal file
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