mainlining shenanigans
4289e60cb0
Willem de Bruijn says: ==================== convert tc_verd to integer bitfields The skb tc_verd field takes up two bytes but uses far fewer bits. Convert the remaining use cases to bitfields that fit in existing holes (depending on config options) and potentially save the two bytes in struct sk_buff. This patchset is based on an earlier set by Florian Westphal and its discussion (http://www.spinics.net/lists/netdev/msg329181.html). Patches 1 and 2 are low hanging fruit: removing the last traces of data that are no longer stored in tc_verd. Patches 3 and 4 convert tc_verd to individual bitfields (5 bits). Patch 5 reduces TC_AT to a single bitfield, as AT_STACK is not valid here (unlike in the case of TC_FROM). Patch 6 changes TC_FROM to two bitfields with clearly defined purpose. It may be possible to reduce storage further after this initial round. If tc_skip_classify is set only by IFB, testing skb_iif may suffice. The L2 header pushing/popping logic can perhaps be shared with AF_PACKET, which currently not pkt_type for the same purpose. Changes: RFC -> v1 - (patch 3): remove no longer needed label in tfc_action_exec - (patch 5): set tc_at_ingress at the same points as existing SET_TC_AT calls Tested ingress mirred + netem + ifb: ip link set dev ifb0 up tc qdisc add dev eth0 ingress tc filter add dev eth0 parent ffff: \ u32 match ip dport 8000 0xffff \ action mirred egress redirect dev ifb0 tc qdisc add dev ifb0 root netem delay 1000ms nc -u -l 8000 & ssh $otherhost nc -u $host 8000 Tested egress mirred: ip link add veth1 type veth peer name veth2 ip link set dev veth1 up ip link set dev veth2 up tcpdump -n -i veth2 udp and dst port 8000 & tc qdisc add dev eth0 root handle 1: prio tc filter add dev eth0 parent 1:0 \ u32 match ip dport 8000 0xffff \ action mirred egress redirect dev veth1 tc qdisc add dev veth1 root netem delay 1000ms nc -u $otherhost 8000 Tested ingress mirred: ip link add veth1 type veth peer name veth2 ip link add veth3 type veth peer name veth4 ip netns add ns0 ip netns add ns1 for i in 1 2 3 4; do \ NS=ns$((${i}%2)); \ ip link set dev veth${i} netns ${NS}; \ ip netns exec ${NS} \ ip addr add dev veth${i} 192.168.1.${i}/24; \ ip netns exec ${NS} \ ip link set dev veth${i} up; \ done ip netns exec ns0 tc qdisc add dev veth2 ingress ip netns exec ns0 \ tc filter add dev veth2 parent ffff: \ u32 match ip dport 8000 0xffff \ action mirred ingress redirect dev veth4 ip netns exec ns0 \ tcpdump -n -i veth4 udp and dst port 8000 & ip netns exec ns1 \ nc -u 192.168.1.2 8000 ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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| README | ||
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.