[ovs-dev] [PATCH OVS v2 4/4] ovs-tc: offload datapath rules matching on internal ports
Roi Dayan
roid at mellanox.com
Mon Apr 8 10:49:09 UTC 2019
On 08/04/2019 13:38, Roi Dayan wrote:
>
>
> On 04/04/2019 19:05, John Hurley wrote:
>> Rules applied to OvS internal ports are not represented in TC datapaths.
>> However, it is possible to support rules matching on internal ports in TC.
>> The start_xmit ndo of OvS internal ports directs packets back into the OvS
>> kernel datapath where they are rematched with the ingress port now being
>> that of the internal port. Due to this, rules matching on an internal port
>> can be added as TC filters to an egress qdisc for these ports.
>>
>> Allow rules applied to internal ports to be offloaded to TC as egress
>> filters. Rules redirecting to an internal port are also offloaded. These
>> are supported by the redirect ingress functionality applied in an earlier
>> patch.
>>
>> Signed-off-by: John Hurley <john.hurley at netronome.com>
>> ---
>> lib/dpif.c | 13 +++++-------
>> lib/netdev-linux.c | 1 +
>> lib/netdev-tc-offloads.c | 55 +++++++++++++++++++++++++++++++++++++-----------
>> 3 files changed, 49 insertions(+), 20 deletions(-)
>>
>> diff --git a/lib/dpif.c b/lib/dpif.c
>> index 457c9bf..063ba20 100644
>> --- a/lib/dpif.c
>> +++ b/lib/dpif.c
>> @@ -101,12 +101,9 @@ static bool should_log_flow_message(const struct vlog_module *module,
>> struct seq *tnl_conf_seq;
>>
>> static bool
>> -dpif_is_internal_port(const char *type)
>> +dpif_is_tap_port(const char *type)
>> {
>> - /* For userspace datapath, tap devices are the equivalent
>> - * of internal devices in the kernel datapath, so both
>> - * these types are 'internal' devices. */
>> - return !strcmp(type, "internal") || !strcmp(type, "tap");
>> + return !strcmp(type, "tap");
>> }
>>
>> static void
>> @@ -359,7 +356,7 @@ do_open(const char *name, const char *type, bool create, struct dpif **dpifp)
>> struct netdev *netdev;
>> int err;
>>
>> - if (dpif_is_internal_port(dpif_port.type)) {
>> + if (dpif_is_tap_port(dpif_port.type)) {
>> continue;
>> }
>>
>> @@ -434,7 +431,7 @@ dpif_remove_netdev_ports(struct dpif *dpif) {
>> struct dpif_port dpif_port;
>>
>> DPIF_PORT_FOR_EACH (&dpif_port, &port_dump, dpif) {
>> - if (!dpif_is_internal_port(dpif_port.type)) {
>> + if (!dpif_is_tap_port(dpif_port.type)) {
>> netdev_ports_remove(dpif_port.port_no, dpif->dpif_class);
>> }
>> }
>> @@ -582,7 +579,7 @@ dpif_port_add(struct dpif *dpif, struct netdev *netdev, odp_port_t *port_nop)
>> VLOG_DBG_RL(&dpmsg_rl, "%s: added %s as port %"PRIu32,
>> dpif_name(dpif), netdev_name, port_no);
>>
>> - if (!dpif_is_internal_port(netdev_get_type(netdev))) {
>> + if (!dpif_is_tap_port(netdev_get_type(netdev))) {
>>
>> struct dpif_port dpif_port;
>>
>> diff --git a/lib/netdev-linux.c b/lib/netdev-linux.c
>> index 87337e0..776d938 100644
>> --- a/lib/netdev-linux.c
>> +++ b/lib/netdev-linux.c
>> @@ -3340,6 +3340,7 @@ const struct netdev_class netdev_tap_class = {
>>
>> const struct netdev_class netdev_internal_class = {
>> NETDEV_LINUX_CLASS_COMMON,
>> + LINUX_FLOW_OFFLOAD_API,
>> .type = "internal",
>> .construct = netdev_linux_construct,
>> .get_stats = netdev_internal_get_stats,
>> diff --git a/lib/netdev-tc-offloads.c b/lib/netdev-tc-offloads.c
>> index 64a9a9e..7c2ebe0 100644
>> --- a/lib/netdev-tc-offloads.c
>> +++ b/lib/netdev-tc-offloads.c
>> @@ -185,11 +185,12 @@ del_ufid_tc_mapping(const ovs_u128 *ufid)
>> /* Wrapper function to delete filter and ufid tc mapping */
>> static int
>> del_filter_and_ufid_mapping(int ifindex, int prio, int handle,
>> - uint32_t block_id, const ovs_u128 *ufid)
>> + uint32_t block_id, const ovs_u128 *ufid,
>> + enum tc_qdisc_hook hook)
>> {
>> int err;
>>
>> - err = tc_del_filter(ifindex, prio, handle, block_id, TC_INGRESS);
>> + err = tc_del_filter(ifindex, prio, handle, block_id, hook);
>> del_ufid_tc_mapping(ufid);
>>
>> return err;
>> @@ -346,9 +347,14 @@ get_block_id_from_netdev(struct netdev *netdev)
>> int
>> netdev_tc_flow_flush(struct netdev *netdev)
>> {
>> + enum tc_qdisc_hook hook = TC_INGRESS;
>> int ifindex = netdev_get_ifindex(netdev);
>> uint32_t block_id = 0;
>>
>> + if (is_internal_port(netdev_get_type(netdev))) {
>> + hook = TC_EGRESS;
>> + }
>> +
>> if (ifindex < 0) {
>> VLOG_ERR_RL(&error_rl, "flow_flush: failed to get ifindex for %s: %s",
>> netdev_get_name(netdev), ovs_strerror(-ifindex));
>> @@ -357,17 +363,22 @@ netdev_tc_flow_flush(struct netdev *netdev)
>>
>> block_id = get_block_id_from_netdev(netdev);
>>
>> - return tc_flush(ifindex, block_id, TC_INGRESS);
>> + return tc_flush(ifindex, block_id, hook);
>> }
>>
>> int
>> netdev_tc_flow_dump_create(struct netdev *netdev,
>> struct netdev_flow_dump **dump_out)
>> {
>> + enum tc_qdisc_hook hook = TC_INGRESS;
>> struct netdev_flow_dump *dump;
>> uint32_t block_id = 0;
>> int ifindex;
>>
>> + if (is_internal_port(netdev_get_type(netdev))) {
>> + hook = TC_EGRESS;
>> + }
>> +
>> ifindex = netdev_get_ifindex(netdev);
>> if (ifindex < 0) {
>> VLOG_ERR_RL(&error_rl, "dump_create: failed to get ifindex for %s: %s",
>> @@ -379,7 +390,7 @@ netdev_tc_flow_dump_create(struct netdev *netdev,
>> dump = xzalloc(sizeof *dump);
>> dump->nl_dump = xzalloc(sizeof *dump->nl_dump);
>> dump->netdev = netdev_ref(netdev);
>> - tc_dump_flower_start(ifindex, dump->nl_dump, block_id, TC_INGRESS);
>> + tc_dump_flower_start(ifindex, dump->nl_dump, block_id, hook);
>>
>> *dump_out = dump;
>>
>> @@ -1085,6 +1096,7 @@ netdev_tc_flow_put(struct netdev *netdev, struct match *match,
>> struct flow *mask = &match->wc.masks;
>> const struct flow_tnl *tnl = &match->flow.tunnel;
>> const struct flow_tnl *tnl_mask = &mask->tunnel;
>> + enum tc_qdisc_hook hook = TC_INGRESS;
>> struct tc_action *action;
>> uint32_t block_id = 0;
>> struct nlattr *nla;
>> @@ -1094,6 +1106,10 @@ netdev_tc_flow_put(struct netdev *netdev, struct match *match,
>> int ifindex;
>> int err;
>>
>> + if (is_internal_port(netdev_get_type(netdev))) {
>> + hook = TC_EGRESS;
>> + }
>> +
>> ifindex = netdev_get_ifindex(netdev);
>> if (ifindex < 0) {
>> VLOG_ERR_RL(&error_rl, "flow_put: failed to get ifindex for %s: %s",
>> @@ -1342,7 +1358,8 @@ netdev_tc_flow_put(struct netdev *netdev, struct match *match,
>> handle = get_ufid_tc_mapping(ufid, &prio, NULL);
>> if (handle && prio) {
>> VLOG_DBG_RL(&rl, "updating old handle: %d prio: %d", handle, prio);
>> - del_filter_and_ufid_mapping(ifindex, prio, handle, block_id, ufid);
>> + del_filter_and_ufid_mapping(ifindex, prio, handle, block_id, ufid,
>> + hook);
>> }
>>
>> if (!prio) {
>> @@ -1356,8 +1373,7 @@ netdev_tc_flow_put(struct netdev *netdev, struct match *match,
>> flower.act_cookie.data = ufid;
>> flower.act_cookie.len = sizeof *ufid;
>>
>> - err = tc_replace_flower(ifindex, prio, handle, &flower, block_id,
>> - TC_INGRESS);
>> + err = tc_replace_flower(ifindex, prio, handle, &flower, block_id, hook);
>> if (!err) {
>> add_ufid_tc_mapping(ufid, flower.prio, flower.handle, netdev, ifindex);
>> }
>> @@ -1375,6 +1391,7 @@ netdev_tc_flow_get(struct netdev *netdev OVS_UNUSED,
>> struct ofpbuf *buf)
>> {
>> static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
>> + enum tc_qdisc_hook hook = TC_INGRESS;
>> struct netdev *dev;
>> struct tc_flower flower;
>> uint32_t block_id = 0;
>> @@ -1389,6 +1406,10 @@ netdev_tc_flow_get(struct netdev *netdev OVS_UNUSED,
>> return ENOENT;
>> }
>>
>> + if (is_internal_port(netdev_get_type(netdev))) {
>> + hook = TC_EGRESS;
>> + }
>> +
>> ifindex = netdev_get_ifindex(dev);
>> if (ifindex < 0) {
>> VLOG_ERR_RL(&error_rl, "flow_get: failed to get ifindex for %s: %s",
>> @@ -1400,7 +1421,7 @@ netdev_tc_flow_get(struct netdev *netdev OVS_UNUSED,
>> block_id = get_block_id_from_netdev(dev);
>> VLOG_DBG_RL(&rl, "flow get (dev %s prio %d handle %d block_id %d)",
>> netdev_get_name(dev), prio, handle, block_id);
>> - err = tc_get_flower(ifindex, prio, handle, &flower, block_id, TC_INGRESS);
>> + err = tc_get_flower(ifindex, prio, handle, &flower, block_id, hook);
>> netdev_close(dev);
>> if (err) {
>> VLOG_ERR_RL(&error_rl, "flow get failed (dev %s prio %d handle %d): %s",
>> @@ -1422,6 +1443,7 @@ netdev_tc_flow_del(struct netdev *netdev OVS_UNUSED,
>> const ovs_u128 *ufid,
>> struct dpif_flow_stats *stats)
>> {
>> + enum tc_qdisc_hook hook = TC_INGRESS;
>> struct tc_flower flower;
>> uint32_t block_id = 0;
>> struct netdev *dev;
>> @@ -1435,6 +1457,10 @@ netdev_tc_flow_del(struct netdev *netdev OVS_UNUSED,
>> return ENOENT;
>> }
>>
>> + if (is_internal_port(netdev_get_type(netdev))) {
>> + hook = TC_EGRESS;
>> + }
>> +
>> ifindex = netdev_get_ifindex(dev);
>> if (ifindex < 0) {
>> VLOG_ERR_RL(&error_rl, "flow_del: failed to get ifindex for %s: %s",
>> @@ -1447,15 +1473,15 @@ netdev_tc_flow_del(struct netdev *netdev OVS_UNUSED,
>>
>> if (stats) {
>> memset(stats, 0, sizeof *stats);
>> - if (!tc_get_flower(ifindex, prio, handle, &flower, block_id,
>> - TC_INGRESS)) {
>> + if (!tc_get_flower(ifindex, prio, handle, &flower, block_id, hook)) {
>> stats->n_packets = get_32aligned_u64(&flower.stats.n_packets);
>> stats->n_bytes = get_32aligned_u64(&flower.stats.n_bytes);
>> stats->used = flower.lastused;
>> }
>> }
>>
>> - error = del_filter_and_ufid_mapping(ifindex, prio, handle, block_id, ufid);
>> + error = del_filter_and_ufid_mapping(ifindex, prio, handle, block_id, ufid,
>> + hook);
>>
>> netdev_close(dev);
>>
>> @@ -1527,10 +1553,15 @@ netdev_tc_init_flow_api(struct netdev *netdev)
>> {
>> static struct ovsthread_once multi_mask_once = OVSTHREAD_ONCE_INITIALIZER;
>> static struct ovsthread_once block_once = OVSTHREAD_ONCE_INITIALIZER;
>> + enum tc_qdisc_hook hook = TC_INGRESS;
>> uint32_t block_id = 0;
>> int ifindex;
>> int error;
>>
>> + if (is_internal_port(netdev_get_type(netdev))) {
>> + hook = TC_EGRESS;
>> + }
>> +
a small refactor suggestion could be a small function for getting
qdisc hook as we have multiple functions declaring hook as ingress and
then change to egress if internal port.
static get_qdisc_hook(netdev)
{
return is_internal_port(netdev_get_type(netdev) ? TC_EGRESS : TC_INGRESS;
}
then all functions will just have this line
enum tc_qdisc_hook hook = get_qdisc_hook(netdev);
>> ifindex = netdev_get_ifindex(netdev);
>> if (ifindex < 0) {
>> VLOG_ERR_RL(&error_rl, "init: failed to get ifindex for %s: %s",
>> @@ -1552,7 +1583,7 @@ netdev_tc_init_flow_api(struct netdev *netdev)
>> }
>>
>> block_id = get_block_id_from_netdev(netdev);
>> - error = tc_add_del_qdisc(ifindex, true, block_id, TC_INGRESS);
>> + error = tc_add_del_qdisc(ifindex, true, block_id, hook);
>>
>> if (error && error != EEXIST) {
>> VLOG_ERR("failed adding ingress qdisc required for offloading: %s",
>>
>
> Reviewed-by: Roi Dayan <roid at mellanox.com>
>
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