On 6/19/23 07:05, Chris Mi wrote:
> Create a unique group ID to map the sFlow info when offloading sample
> action to TC. When showing the offloaded datapath flows, translate the
> group ID from TC sample action to sFlow info using the mapping.
>
> Signed-off-by: Chris Mi <c...@nvidia.com>
> Reviewed-by: Roi Dayan <r...@nvidia.com>
> ---
> lib/netdev-offload-tc.c | 288 ++++++++++++++++++++++++++++++++++++----
> lib/tc.c | 63 ++++++++-
> lib/tc.h | 6 +
> 3 files changed, 331 insertions(+), 26 deletions(-)
This patch needs a NEWS entry.
>
> diff --git a/lib/netdev-offload-tc.c b/lib/netdev-offload-tc.c
> index 8d571aca8..71ec8ef1f 100644
> --- a/lib/netdev-offload-tc.c
> +++ b/lib/netdev-offload-tc.c
> @@ -95,6 +95,7 @@ static int police_idx_lookup(uint32_t police_idx, uint32_t
> *meter_id);
> static int netdev_tc_parse_nl_actions(struct netdev *netdev,
> struct tc_flower *flower,
> struct offload_info *info,
> + const struct flow_tnl *tnl,
> const struct nlattr *actions,
> size_t actions_len,
> bool *recirc_act, bool more_actions,
> @@ -136,6 +137,12 @@ static struct ovs_mutex sgid_lock =
> OVS_MUTEX_INITIALIZER;
> static struct cmap sgid_map = CMAP_INITIALIZER;
> static struct id_pool *sample_group_ids OVS_GUARDED_BY(sgid_lock);
>
> +static bool
> +psample_supported(void)
> +{
> + return psample_sock != NULL;
> +}
> +
> static void
> sgid_node_free(struct sgid_node *node)
> {
> @@ -236,6 +243,30 @@ sgid_free(uint32_t id)
> }
> }
>
> +static void free_all_flower_sgids(struct tc_flower *flower)
> +{
> + const struct tc_action *action = flower->actions;
> +
> + for (int i = 0; i < flower->action_count; i++, action++) {
> + if (action->type == TC_ACT_SAMPLE) {
> + sgid_free(action->sample.group_id);
> + }
> + }
> +}
> +
> +static unsigned int get_flower_sgid_count(struct tc_flower *flower)
> +{
> + const struct tc_action *action = flower->actions;
> + unsigned int count = 0;
> +
> + for (int i = 0; i < flower->action_count; i++, action++) {
> + if (action->type == TC_ACT_SAMPLE && action->sample.group_id) {
> + count++;
> + }
> + }
> + return count;
> +}
> +
> static bool
> is_internal_port(const char *type)
> {
> @@ -370,7 +401,12 @@ del_ufid_tc_mapping_unlocked(const ovs_u128 *ufid)
> hmap_remove(&ufid_to_tc, &data->ufid_to_tc_node);
> hmap_remove(&tc_to_ufid, &data->tc_to_ufid_node);
> netdev_close(data->netdev);
> - sgid_free(data->sample_group_id[0]);
> + for (int i = 0; i < MAX_TC_SAMPLES_PER_FLOW; i++) {
> + if (!data->sample_group_id[i]) {
> + break;
> + }
> + sgid_free(data->sample_group_id[i]);
> + }
> free(data);
> }
>
> @@ -426,10 +462,12 @@ del_filter_and_ufid_mapping(struct tcf_id *id, const
> ovs_u128 *ufid,
> /* Add ufid entry to ufid_to_tc hashmap. */
> static void
> add_ufid_tc_mapping(struct netdev *netdev, const ovs_u128 *ufid,
> - struct tcf_id *id, struct dpif_flow_stats *stats)
> + struct tcf_id *id, struct dpif_flow_stats *stats,
> + struct tc_flower *flower)
> {
> struct ufid_tc_data *new_data = xzalloc(sizeof *new_data);
> size_t ufid_hash = hash_bytes(ufid, sizeof *ufid, 0);
> + const struct tc_action *action = flower->actions;
> size_t tc_hash;
>
> tc_hash = hash_int(hash_int(id->prio, id->handle), id->ifindex);
> @@ -442,6 +480,15 @@ add_ufid_tc_mapping(struct netdev *netdev, const
> ovs_u128 *ufid,
> new_data->adjust_stats = *stats;
> }
>
> + for (int i = 0, si = 0; i < flower->action_count; i++, action++) {
> + if (action->type == TC_ACT_SAMPLE && action->sample.group_id) {
> + new_data->sample_group_id[si++] = action->sample.group_id;
> + if (si >= MAX_TC_SAMPLES_PER_FLOW) {
> + break;
> + }
> + }
> + }
> +
> ovs_mutex_lock(&ufid_lock);
> hmap_insert(&ufid_to_tc, &new_data->ufid_to_tc_node, ufid_hash);
> hmap_insert(&tc_to_ufid, &new_data->tc_to_ufid_node, tc_hash);
> @@ -908,6 +955,19 @@ parse_tc_flower_to_actions__(struct tc_flower *flower,
> struct ofpbuf *buf,
> action = &flower->actions[i];
>
> switch (action->type) {
> + case TC_ACT_SAMPLE: {
> + const struct sgid_node *node;
> +
> + node = sgid_find(action->sample.group_id);
> + if (!node) {
> + VLOG_WARN("Can't find sample group ID data for ID: %u",
> + action->sample.group_id);
> + return ENOENT;
> + }
> + nl_msg_put(buf, node->sample.action,
> + node->sample.action->nla_len);
> + }
> + break;
> case TC_ACT_VLAN_POP: {
> nl_msg_put_flag(buf, OVS_ACTION_ATTR_POP_VLAN);
> }
> @@ -2023,11 +2083,164 @@ parse_match_ct_state_to_flower(struct tc_flower
> *flower, struct match *match)
> }
> }
>
> +static int
> +parse_userspace_attributes(const struct nlattr *actions,
> + struct offload_sample *sample)
> +{
> + static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
> + const struct nlattr *nla;
> + unsigned int left;
> +
> + NL_NESTED_FOR_EACH_UNSAFE (nla, left, actions) {
> + if (nl_attr_type(nla) == OVS_USERSPACE_ATTR_USERDATA) {
> + struct user_action_cookie cookie;
> +
> + memcpy(&cookie, nl_attr_get_unspec(nla, sizeof cookie),
> + sizeof cookie);
> + if (cookie.type == USER_ACTION_COOKIE_SFLOW) {
> + sample->type = USER_ACTION_COOKIE_SFLOW;
> + sample->userdata = CONST_CAST(struct nlattr *, nla);
> + return 0;
> + }
> + }
> + }
> +
> + VLOG_DBG_RL(&rl, "Can't offload userspace action other than sFlow");
> + return EOPNOTSUPP;
> +}
> +
> +static int
> +parse_sample_actions_attribute(const struct nlattr *actions,
> + struct offload_sample *sample)
> +{
> + static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
> + const struct nlattr *nla;
> + unsigned int left;
> + int err = EINVAL;
> +
> + NL_NESTED_FOR_EACH_UNSAFE (nla, left, actions) {
> + if (nl_attr_type(nla) == OVS_ACTION_ATTR_USERSPACE) {
> + err = parse_userspace_attributes(nla, sample);
> + } else {
> + /* We can't offload other nested actions. */
> + VLOG_DBG_RL(&rl, "Can only offload OVS_ACTION_ATTR_USERSPACE"
> + " attribute");
> + return EINVAL;
> + }
> + }
> +
> + if (err) {
> + VLOG_ERR_RL(&error_rl, "No OVS_ACTION_ATTR_USERSPACE attribute");
> + }
> + return err;
> +}
> +
> +static void
> +offload_sample_init(struct offload_sample *sample,
> + const struct nlattr *next_actions,
> + size_t next_actions_len,
> + struct tc_flower *flower,
> + const struct flow_tnl *tnl)
> +{
> + memset(sample, 0, sizeof *sample);
> + if (flower->tunnel) {
> + sample->tunnel = CONST_CAST(struct flow_tnl *, tnl);
> + }
> +
> + sample->userspace_actions = xmalloc(next_actions_len + NLA_HDRLEN);
> + nullable_memcpy((char *) sample->userspace_actions + NLA_HDRLEN,
> + next_actions, next_actions_len);
> + sample->userspace_actions->nla_len = next_actions_len + NLA_HDRLEN;
> + sample->ifindex = flower->ifindex;
> +}
> +
> +static int
> +parse_sample_action(struct tc_flower *flower, struct tc_action *tc_action,
> + const struct nlattr *next_actions, size_t
> next_actions_len,
> + const struct nlattr *sample_action,
> + const struct flow_tnl *tnl)
> +{
> + static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
> + struct offload_sample sample;
> + const struct nlattr *nla;
> + unsigned int left;
> + uint32_t rate = 0;
> + int ret = EINVAL;
> + uint32_t sgid;
> +
> + offload_sample_init(&sample, next_actions, next_actions_len, flower,
> tnl);
> + sample.action = CONST_CAST(struct nlattr *, sample_action);
> +
> + NL_NESTED_FOR_EACH_UNSAFE (nla, left, sample_action) {
> + if (nl_attr_type(nla) == OVS_SAMPLE_ATTR_ACTIONS) {
> + ret = parse_sample_actions_attribute(nla, &sample);
> + } else if (nl_attr_type(nla) == OVS_SAMPLE_ATTR_PROBABILITY) {
> + rate = UINT32_MAX / nl_attr_get_u32(nla);
> + } else {
> + return EINVAL;
> + }
> + }
> +
> + /* This check makes sure both attributes above were present and valid. */
> + if (!rate || ret) {
> + return EINVAL;
> + }
> +
> + sgid = sgid_alloc(&sample);
> + if (!sgid) {
> + VLOG_DBG_RL(&rl, "Failed allocating group id for sample action");
> + return ENOENT;
> + }
> +
> + tc_action->type = TC_ACT_SAMPLE;
> + tc_action->sample.rate = rate;
> + tc_action->sample.group_id = sgid;
> + flower->action_count++;
> +
> + return 0;
> +}
> +
> +static int
> +parse_userspace_action(struct tc_flower *flower, struct tc_action *tc_action,
> + const struct nlattr *next_actions,
> + size_t next_actions_len,
> + const struct nlattr *userspace_action,
> + const struct flow_tnl *tnl)
> +{
> + static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
> + struct offload_sample sample;
> + uint32_t sgid;
> + int err;
> +
> + offload_sample_init(&sample, next_actions, next_actions_len, flower,
> tnl);
> +
> + /* If sampling rate is 1, there is only a sFlow cookie inside of a
> + * userspace action, but no sample attribute. That means we can
> + * only offload userspace actions for sFlow. */
> + err = parse_userspace_attributes(userspace_action, &sample);
> + if (err) {
> + return err;
> + }
> + sample.action = (struct nlattr *) userspace_action;
This should be a CONST_CAST.
> + sgid = sgid_alloc(&sample);
> + if (!sgid) {
> + VLOG_DBG_RL(&rl, "Failed allocating group id for sample action");
> + return ENOENT;
> + }
> + tc_action->type = TC_ACT_SAMPLE;
> + tc_action->sample.group_id = sgid;
> + tc_action->sample.rate = 1;
> + flower->action_count++;
> +
> + return 0;
> +}
>
> static int
> parse_check_pkt_len_action(struct netdev *netdev, struct tc_flower *flower,
> - struct offload_info *info, struct tc_action
> *action,
> - const struct nlattr *nla, bool last_action,
> + struct offload_info *info,
> + const struct flow_tnl *tnl,
> + struct tc_action *action, const struct nlattr
> *nla,
> + bool last_action,
> struct tc_action **need_jump_update,
> bool *recirc_act)
> {
> @@ -2066,7 +2279,7 @@ parse_check_pkt_len_action(struct netdev *netdev,
> struct tc_flower *flower,
> * NOTE: The last_action parameter means that there are no more actions
> * after the if () then ... else () case. */
> nl_actions = a[OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER];
> - err = netdev_tc_parse_nl_actions(netdev, flower, info,
> + err = netdev_tc_parse_nl_actions(netdev, flower, info, tnl,
> nl_attr_get(nl_actions),
> nl_attr_get_size(nl_actions),
> recirc_act, !last_action,
> @@ -2082,7 +2295,7 @@ parse_check_pkt_len_action(struct netdev *netdev,
> struct tc_flower *flower,
>
> /* Parse and add the less than action(s). */
> nl_actions = a[OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL];
> - err = netdev_tc_parse_nl_actions(netdev, flower, info,
> + err = netdev_tc_parse_nl_actions(netdev, flower, info, tnl,
> nl_attr_get(nl_actions),
> nl_attr_get_size(nl_actions),
> recirc_act, !last_action,
> @@ -2135,6 +2348,7 @@ parse_check_pkt_len_action(struct netdev *netdev,
> struct tc_flower *flower,
> static int
> netdev_tc_parse_nl_actions(struct netdev *netdev, struct tc_flower *flower,
> struct offload_info *info,
> + const struct flow_tnl *tnl,
> const struct nlattr *actions, size_t actions_len,
> bool *recirc_act, bool more_actions,
> struct tc_action **need_jump_update)
> @@ -2264,7 +2478,8 @@ netdev_tc_parse_nl_actions(struct netdev *netdev,
> struct tc_flower *flower,
> action->police.index = police_index;
> flower->action_count++;
> } else if (nl_attr_type(nla) == OVS_ACTION_ATTR_CHECK_PKT_LEN) {
> - err = parse_check_pkt_len_action(netdev, flower, info, action,
> nla,
> + err = parse_check_pkt_len_action(netdev, flower, info, tnl,
> + action, nla,
> nl_attr_len_pad(nla,
> left) >= left
> && !more_actions,
> @@ -2273,14 +2488,28 @@ netdev_tc_parse_nl_actions(struct netdev *netdev,
> struct tc_flower *flower,
> if (err) {
> return err;
> }
> - } else if (nl_attr_type(nla) == OVS_ACTION_ATTR_SAMPLE) {
> - struct offload_sample sample;
> - uint32_t sgid;
> -
> - memset(&sample, 0, sizeof sample);
> - sgid = sgid_alloc(&sample);
> - sgid_free(sgid);
> - return EOPNOTSUPP;
> + } else if (nl_attr_type(nla) == OVS_ACTION_ATTR_SAMPLE ||
> + nl_attr_type(nla) == OVS_ACTION_ATTR_USERSPACE) {
> + if (!psample_supported()) {
> + VLOG_DBG_RL(&rl, "Unsupported put action type: %d, psample
> is "
> + "not initialized successfully",
> nl_attr_type(nla));
> + return EOPNOTSUPP;
> + }
> + if (get_flower_sgid_count(flower) >= MAX_TC_SAMPLES_PER_FLOW) {
> + VLOG_ERR_RL(&error_rl, "Only %u TC_SAMPLE action per "
> + "flow is supported", MAX_TC_SAMPLES_PER_FLOW);
> + return EOPNOTSUPP;
> + }
> + if (nl_attr_type(nla) == OVS_ACTION_ATTR_SAMPLE) {
> + err = parse_sample_action(flower, action, actions,
> actions_len,
> + nla, tnl);
> + } else {
> + err = parse_userspace_action(flower, action, actions,
> + actions_len, nla, tnl);
> + }
> + if (err) {
> + return err;
> + }
> } else {
> VLOG_DBG_RL(&rl, "unsupported put action type: %d",
> nl_attr_type(nla));
> @@ -2320,6 +2549,7 @@ netdev_tc_flow_put(struct netdev *netdev, struct match
> *match,
> }
>
> memset(&flower, 0, sizeof flower);
> + flower.ifindex = ifindex;
>
> chain = key->recirc_id;
> mask->recirc_id = 0;
> @@ -2585,16 +2815,17 @@ netdev_tc_flow_put(struct netdev *netdev, struct
> match *match,
> }
>
> /* Parse all (nested) actions. */
> - err = netdev_tc_parse_nl_actions(netdev, &flower, info,
> + err = netdev_tc_parse_nl_actions(netdev, &flower, info, tnl,
> actions, actions_len, &recirc_act,
> false, NULL);
> if (err) {
> - return err;
> + goto error_out;
> }
>
> if ((chain || recirc_act) && !info->recirc_id_shared_with_tc) {
> VLOG_DBG_RL(&rl, "flow_put: recirc_id sharing not supported");
> - return EOPNOTSUPP;
> + err = EOPNOTSUPP;
> + goto error_out;
> }
>
> memset(&adjust_stats, 0, sizeof adjust_stats);
> @@ -2608,7 +2839,8 @@ netdev_tc_flow_put(struct netdev *netdev, struct match
> *match,
> prio = get_prio_for_tc_flower(&flower);
> if (prio == 0) {
> VLOG_ERR_RL(&rl, "couldn't get tc prio: %s", ovs_strerror(ENOSPC));
> - return ENOSPC;
> + err = ENOSPC;
> + goto error_out;
> }
>
> flower.act_cookie.data = ufid;
> @@ -2617,14 +2849,20 @@ netdev_tc_flow_put(struct netdev *netdev, struct
> match *match,
> block_id = get_block_id_from_netdev(netdev);
> id = tc_make_tcf_id_chain(ifindex, block_id, chain, prio, hook);
> err = tc_replace_flower(&id, &flower);
> - if (!err) {
> - if (stats) {
> - memset(stats, 0, sizeof *stats);
> - netdev_tc_adjust_stats(stats, &adjust_stats);
> - }
> - add_ufid_tc_mapping(netdev, ufid, &id, &adjust_stats);
> + if (err) {
> + goto error_out;
> }
>
> + if (stats) {
> + memset(stats, 0, sizeof *stats);
> + netdev_tc_adjust_stats(stats, &adjust_stats);
> + }
> +
> + add_ufid_tc_mapping(netdev, ufid, &id, &adjust_stats, &flower);
> + return 0;
> +
> +error_out:
> + free_all_flower_sgids(&flower);
> return err;
> }
>
> diff --git a/lib/tc.c b/lib/tc.c
> index 270dc95ce..361914525 100644
> --- a/lib/tc.c
> +++ b/lib/tc.c
> @@ -23,14 +23,15 @@
> #include <linux/if_packet.h>
> #include <linux/rtnetlink.h>
> #include <linux/tc_act/tc_csum.h>
> +#include <linux/tc_act/tc_ct.h>
> #include <linux/tc_act/tc_gact.h>
> #include <linux/tc_act/tc_mirred.h>
> #include <linux/tc_act/tc_mpls.h>
> #include <linux/tc_act/tc_pedit.h>
> +#include <linux/tc_act/tc_sample.h>
> #include <linux/tc_act/tc_skbedit.h>
> #include <linux/tc_act/tc_tunnel_key.h>
> #include <linux/tc_act/tc_vlan.h>
> -#include <linux/tc_act/tc_ct.h>
> #include <linux/gen_stats.h>
> #include <net/if.h>
> #include <unistd.h>
> @@ -1487,6 +1488,38 @@ nl_parse_act_police(const struct nlattr *options,
> struct tc_flower *flower)
> return 0;
> }
>
> +static const struct nl_policy sample_policy[] = {
> + [TCA_SAMPLE_PARMS] = { .type = NL_A_UNSPEC,
> + .min_len = sizeof(struct tc_sample),
> + .optional = false, },
> + [TCA_SAMPLE_PSAMPLE_GROUP] = { .type = NL_A_U32,
> + .optional = false, },
> + [TCA_SAMPLE_RATE] = { .type = NL_A_U32,
> + .optional = false, },
> +};
> +
> +static int
> +nl_parse_act_sample(struct nlattr *options, struct tc_flower *flower)
> +{
> + struct nlattr *sample_attrs[ARRAY_SIZE(sample_policy)];
> + struct tc_action *action;
> +
> + if (!nl_parse_nested(options, sample_policy, sample_attrs,
> + ARRAY_SIZE(sample_policy))) {
> + VLOG_ERR_RL(&error_rl, "Failed to parse sample action options");
> + return EPROTO;
> + }
> +
> + action = &flower->actions[flower->action_count++];
> + action->type = TC_ACT_SAMPLE;
> + action->sample.group_id =
> + nl_attr_get_u32(sample_attrs[TCA_SAMPLE_PSAMPLE_GROUP]);
> + action->sample.rate =
> + nl_attr_get_u32(sample_attrs[TCA_SAMPLE_RATE]);
> +
> + return 0;
> +}
> +
> static const struct nl_policy mirred_policy[] = {
> [TCA_MIRRED_PARMS] = { .type = NL_A_UNSPEC,
> .min_len = sizeof(struct tc_mirred),
> @@ -2002,6 +2035,8 @@ nl_parse_single_action(struct nlattr *action, struct
> tc_flower *flower,
> nl_parse_act_ct(act_options, flower);
> } else if (!strcmp(act_kind, "police")) {
> nl_parse_act_police(act_options, flower);
> + } else if (!strcmp(act_kind, "sample")) {
> + nl_parse_act_sample(act_options, flower);
> } else {
> VLOG_ERR_RL(&error_rl, "unknown tc action kind: %s", act_kind);
> err = EINVAL;
> @@ -2804,6 +2839,24 @@ nl_msg_put_act_mirred(struct ofpbuf *request, int
> ifindex, int action,
> nl_msg_end_nested(request, offset);
> }
>
> +static void
> +nl_msg_put_act_sample(struct ofpbuf *request, uint32_t rate, uint32_t
> group_id,
> + uint32_t action_pc)
> +{
> + size_t offset;
> +
> + nl_msg_put_string(request, TCA_ACT_KIND, "sample");
> + offset = nl_msg_start_nested(request, TCA_ACT_OPTIONS | NLA_F_NESTED);
> + {
> + struct tc_sample parm = { .action = action_pc };
> +
> + nl_msg_put_unspec(request, TCA_SAMPLE_PARMS, &parm, sizeof parm);
> + nl_msg_put_u32(request, TCA_SAMPLE_RATE, rate);
> + nl_msg_put_u32(request, TCA_SAMPLE_PSAMPLE_GROUP, group_id);
> + }
> + nl_msg_end_nested(request, offset);
> +}
> +
> static inline void
> nl_msg_put_act_cookie(struct ofpbuf *request, struct tc_cookie *ck) {
> if (ck->len) {
> @@ -3116,6 +3169,7 @@ get_action_index_for_tc_actions(struct tc_flower
> *flower, uint16_t act_index,
> case TC_ACT_MPLS_SET:
> case TC_ACT_GOTO:
> case TC_ACT_CT:
> + case TC_ACT_SAMPLE:
> /* Increase act_index by one if we are sure this type of action
> * will only add one tc action in the kernel. */
> act_index++;
> @@ -3323,6 +3377,13 @@ nl_msg_put_flower_acts(struct ofpbuf *request, struct
> tc_flower *flower)
> nl_msg_end_nested(request, act_offset);
> }
> break;
> + case TC_ACT_SAMPLE: {
> + act_offset = nl_msg_start_nested(request, act_index++);
> + nl_msg_put_act_sample(request, action->sample.rate,
> + action->sample.group_id, action_pc);
> + nl_msg_end_nested(request, act_offset);
> + }
> + break;
> case TC_ACT_OUTPUT: {
> if (!released && flower->tunnel) {
> nl_msg_put_flower_acts_release(request, act_index++);
> diff --git a/lib/tc.h b/lib/tc.h
> index cdd3b4f60..5f6e15d5c 100644
> --- a/lib/tc.h
> +++ b/lib/tc.h
> @@ -192,6 +192,7 @@ enum tc_action_type {
> TC_ACT_CT,
> TC_ACT_POLICE,
> TC_ACT_POLICE_MTU,
> + TC_ACT_SAMPLE,
> };
>
> enum nat_type {
> @@ -283,6 +284,10 @@ struct tc_action {
> uint32_t result_jump;
> uint16_t mtu;
> } police;
> + struct {
> + uint32_t rate;
> + uint32_t group_id;
> + } sample;
> };
>
> enum tc_action_type type;
> @@ -380,6 +385,7 @@ struct tc_flower {
> enum tc_offloaded_state offloaded_state;
> /* Used to force skip_hw when probing tc features. */
> enum tc_offload_policy tc_policy;
> + uint16_t ifindex;
> };
>
> int tc_replace_flower(struct tcf_id *id, struct tc_flower *flower);
No need for variable names.
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