README and use system scapy.

Signed-off-by: fruffy <[email protected]>

Author: fruffy

backends/bmv2/README.md

@@ -30,8 +30,6 @@ To run and test this back-end you need some additional tools:
 - the BMv2 behavioral model itself.  Installation instructions are available [here](https://github.com/p4lang/behavioral-model#installing-bmv2).  You may need to update your
   dynamic libraries after installing bmv2: `sudo ldconfig`
 
-- the Python scapy library `sudo pip3 install scapy`
-
 # Unsupported P4_16 language features
 
 Here are some unsupported features we are aware of. We will update this list as

backends/ebpf/README.md

@@ -237,7 +237,8 @@ Additionally, the eBPF compiler test suite has the following python dependencies
 
 - The python ply package to parse .stf testing files.
 
-- The python scapy package to read and write pcap files.
+- The python scapy package, to easily construct test packets with
+  selected sequences of headers.
 
 You can install these using:
 ```

tools/ci-build.sh

@@ -182,15 +182,15 @@ fi
 
 # ! ------  BEGIN EBPF -----------------------------------------------
 function build_ebpf() {
-  P4C_EBPF_DEPS="libpcap-dev \
-                 libelf-dev \
-                 zlib1g-dev \
-                 iproute2 \
-                 iptables \
+  P4C_EBPF_DEPS="libpcap-dev   \
+                 libelf-dev    \
+                 zlib1g-dev    \
+                 iproute2      \
+                 iptables      \
+                 python3-scapy \
                  net-tools"
   P4C_EBPF_DEPS+=" llvm clang "
   sudo apt-get install -y --no-install-recommends ${P4C_EBPF_DEPS}
-  uv pip install scapy==2.5.0
 }
 
 function install_ptf_ebpf_test_deps() (