On Wed, Sep 3, 2014 at 8:20 AM, John Fastabend <john.fastab...@gmail.com> wrote:
> On 09/03/2014 02:24 AM, Jiri Pirko wrote:
>>
>> After this, flow related structures can be used in other code.
>>
>> Signed-off-by: Jiri Pirko <j...@resnulli.us>
>> ---
>
>
> Hi Jiri,
>
> As I indicated before I'm looking into integrating this with some
> hardware here. Progress is a bit slow but starting to look at it.The
> i40e/ixgbe driver being one open source example with very limited
> support for tables, flow matches, etc. And then a closed source driver
> with much more flexibility. What I don't have is a middle of the road
> switch to work with something better then a host nic but not as
> flexible as a TOR.
>
> Couple questions my assumption here is I can extend the flow_key
> as needed to support additional match criteria my hardware has.
> I scanned the ./net/openvswitch source and I didn't catch any
> place that would break but might need to take a closer look.
> Similarly the actions set will need to be extended. For example
> if I want to use this with i40e a OVS_ACTION_ATTR_QUEUE could
> be used to steer packets to the queue. With this in mind we
> will want a follow up patch to rename OVS_ACTION_ATTR_* to
> FLOW_ACTION_ATTR_*
>
struct sw_flow_key is internal structure of OVS, it is designed to
have better flow-table performance. By adding hw specific fields in
sw_flow_key, it increase flow-key size and that has negative impact on
OVS software switching performance. Therefore it is better not to
share this internal structure with driver interface.
Thanks.
> Also I have some filters that can match on offset/length/mask
> tuples. As far as I can tell this is going to have to be yet
> another interface? Or would it be worth the effort to define
> the flow key more generically. My initial guess is I'll just
> write a separate interface. I think this is what Jamal referred
> to as another "classifier".
>
> Thanks,
> John
>
> [...]
>
>
>> +
>> +struct sw_flow_key_ipv4_tunnel {
>> + __be64 tun_id;
>> + __be32 ipv4_src;
>> + __be32 ipv4_dst;
>> + __be16 tun_flags;
>> + u8 ipv4_tos;
>> + u8 ipv4_ttl;
>> +};
>> +
>> +struct sw_flow_key {
>> + struct sw_flow_key_ipv4_tunnel tun_key; /* Encapsulating tunnel
>> key. */
>> + struct {
>> + u32 priority; /* Packet QoS priority. */
>> + u32 skb_mark; /* SKB mark. */
>> + u16 in_port; /* Input switch port (or
>> DP_MAX_PORTS). */
>> + } __packed phy; /* Safe when right after 'tun_key'. */
>> + struct {
>> + u8 src[ETH_ALEN]; /* Ethernet source address. */
>> + u8 dst[ETH_ALEN]; /* Ethernet destination address.
>> */
>> + __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT
>> set otherwise. */
>> + __be16 type; /* Ethernet frame type. */
>> + } eth;
>> + struct {
>> + u8 proto; /* IP protocol or lower 8 bits of
>> ARP opcode. */
>> + u8 tos; /* IP ToS. */
>> + u8 ttl; /* IP TTL/hop limit. */
>> + u8 frag; /* One of OVS_FRAG_TYPE_*. */
>> + } ip;
>> + struct {
>> + __be16 src; /* TCP/UDP/SCTP source port. */
>> + __be16 dst; /* TCP/UDP/SCTP destination port.
>> */
>> + __be16 flags; /* TCP flags. */
>> + } tp;
>> + union {
>> + struct {
>> + struct {
>> + __be32 src; /* IP source address. */
>> + __be32 dst; /* IP destination address.
>> */
>> + } addr;
>> + struct {
>> + u8 sha[ETH_ALEN]; /* ARP source
>> hardware address. */
>> + u8 tha[ETH_ALEN]; /* ARP target
>> hardware address. */
>> + } arp;
>> + } ipv4;
>> + struct {
>> + struct {
>> + struct in6_addr src; /* IPv6 source
>> address. */
>> + struct in6_addr dst; /* IPv6
>> destination address. */
>> + } addr;
>> + __be32 label; /* IPv6 flow
>> label. */
>> + struct {
>> + struct in6_addr target; /* ND target
>> address. */
>> + u8 sll[ETH_ALEN]; /* ND source link
>> layer address. */
>> + u8 tll[ETH_ALEN]; /* ND target link
>> layer address. */
>> + } nd;
>> + } ipv6;
>> + };
>> +} __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as
>> longs. */
>> +
>> +struct sw_flow_key_range {
>> + unsigned short int start;
>> + unsigned short int end;
>> +};
>> +
>> +struct sw_flow_mask {
>> + struct sw_flow_key_range range;
>> + struct sw_flow_key key;
>> +};
>> +
>> +struct sw_flow_action {
>> +};
>> +
>> +struct sw_flow_actions {
>> + unsigned count;
>> + struct sw_flow_action actions[0];
>> +};
>> +
>> +struct sw_flow {
>> + struct sw_flow_key key;
>> + struct sw_flow_key unmasked_key;
>> + struct sw_flow_mask *mask;
>> + struct sw_flow_actions *actions;
>> +};
>> +
>
>
>
> --
> John Fastabend Intel Corporation
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