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Message-ID: <CALnjE+o4tbQVTyVkzdOG8zj=qxPZ8Dv3vGHbYkBmghxsLgKkkw@mail.gmail.com>
Date: Tue, 9 Dec 2014 10:32:38 -0800
From: Pravin Shelar <pshelar@...ira.com>
To: Joe Stringer <joestringer@...ira.com>
Cc: netdev <netdev@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
"dev@...nvswitch.org" <dev@...nvswitch.org>
Subject: Re: [PATCHv11 net-next 2/2] openvswitch: Add support for unique flow IDs.
On Tue, Dec 2, 2014 at 6:56 PM, Joe Stringer <joestringer@...ira.com> wrote:
> Previously, flows were manipulated by userspace specifying a full,
> unmasked flow key. This adds significant burden onto flow
> serialization/deserialization, particularly when dumping flows.
>
> This patch adds an alternative way to refer to flows using a
> variable-length "unique flow identifier" (UFID). At flow setup time,
> userspace may specify a UFID for a flow, which is stored with the flow
> and inserted into a separate table for lookup, in addition to the
> standard flow table. Flows created using a UFID must be fetched or
> deleted using the UFID.
>
> All flow dump operations may now be made more terse with OVS_UFID_F_*
> flags. For example, the OVS_UFID_F_OMIT_KEY flag allows responses to
> omit the flow key from a datapath operation if the flow has a
> corresponding UFID. This significantly reduces the time spent assembling
> and transacting netlink messages. With all OVS_UFID_F_OMIT_* flags
> enabled, the datapath only returns the UFID and statistics for each flow
> during flow dump, increasing ovs-vswitchd revalidator performance by up
> to 50%.
>
> Signed-off-by: Joe Stringer <joestringer@...ira.com>
Thanks for updating patch against net-next.
> ---
> v11: Separate UFID and unmasked key from sw_flow.
> Modify interface to remove nested UFID attributes.
> Only allow UFIDs between 1-256 octets.
> Move UFID nla fetch helpers to flow_netlink.h.
> Perform complete nlmsg_parsing in ovs_flow_cmd_dump().
> Check UFID table for flows with duplicate UFID at flow setup.
> Tidy up mask/key/ufid insertion into flow_table.
> Rebase.
> v10: Ignore flow_key in requests if UFID is specified.
> Only allow UFID flows to be indexed by UFID.
> Only allow non-UFID flows to be indexed by unmasked flow key.
> Unite the unmasked_key and ufid+ufid_hash in 'struct sw_flow'.
> Don't periodically rehash the UFID table.
> Resize the UFID table independently from the flow table.
> Modify table_destroy() to iterate once and delete from both tables.
> Fix UFID memory leak in flow_free().
> Remove kernel-only UFIDs for non-UFID cases.
> Rename "OVS_UFID_F_SKIP_*" -> "OVS_UFID_F_OMIT_*"
> Update documentation.
> Rebase.
> v9: No change.
> v8: Rename UID -> UFID "unique flow identifier".
> Fix null dereference when adding flow without uid or mask.
> If UFID and not match are specified, and lookup fails, return ENOENT.
> Rebase.
> v7: Remove OVS_DP_F_INDEX_BY_UID.
> Rework UID serialisation for variable-length UID.
> Log error if uid not specified and OVS_UID_F_SKIP_KEY is set.
> Rebase against "probe" logging changes.
> v6: Fix documentation for supporting UIDs between 32-128 bits.
> Minor style fixes.
> Rebase.
> v5: No change.
> v4: Fix memory leaks.
> Log when triggering the older userspace issue above.
> v3: Initial post.
> ---
> Documentation/networking/openvswitch.txt | 13 ++
> include/uapi/linux/openvswitch.h | 20 +++
> net/openvswitch/datapath.c | 241 +++++++++++++++++++-----------
> net/openvswitch/flow.h | 16 +-
> net/openvswitch/flow_netlink.c | 63 +++++++-
> net/openvswitch/flow_netlink.h | 4 +
> net/openvswitch/flow_table.c | 204 +++++++++++++++++++------
> net/openvswitch/flow_table.h | 7 +
> 8 files changed, 437 insertions(+), 131 deletions(-)
>
> diff --git a/Documentation/networking/openvswitch.txt b/Documentation/networking/openvswitch.txt
> index 37c20ee..b3b9ac6 100644
> --- a/Documentation/networking/openvswitch.txt
> +++ b/Documentation/networking/openvswitch.txt
> @@ -131,6 +131,19 @@ performs best-effort detection of overlapping wildcarded flows and may reject
> some but not all of them. However, this behavior may change in future versions.
>
>
> +Unique flow identifiers
> +-----------------------
> +
> +An alternative to using the original match portion of a key as the handle for
> +flow identification is a unique flow identifier, or "UFID". UFIDs are optional
> +for both the kernel and user space program.
> +
> +User space programs that support UFID are expected to provide it during flow
> +setup in addition to the flow, then refer to the flow using the UFID for all
> +future operations. The kernel is not required to index flows by the original
> +flow key if a UFID is specified.
> +
> +
> Basic rule for evolving flow keys
> ---------------------------------
>
> diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
> index 3a6dcaa..80db129 100644
> --- a/include/uapi/linux/openvswitch.h
> +++ b/include/uapi/linux/openvswitch.h
> @@ -444,6 +444,14 @@ struct ovs_key_nd {
> * a wildcarded match. Omitting attribute is treated as wildcarding all
> * corresponding fields. Optional for all requests. If not present,
> * all flow key bits are exact match bits.
> + * @OVS_FLOW_ATTR_UFID: A value between 1-256 octets specifying a unique
> + * identifier for the flow. Causes the flow to be indexed by this value rather
> + * than the value of the %OVS_FLOW_ATTR_KEY attribute. Optional for all
> + * requests. Present in notifications if the flow was created with this
> + * attribute.
> + * @OVS_FLOW_ATTR_UFID_FLAGS: A 32-bit value of OR'd %OVS_UFID_F_*
> + * flags that provide alternative semantics for flow installation and
> + * retrieval. Optional for all requests.
> *
> * These attributes follow the &struct ovs_header within the Generic Netlink
> * payload for %OVS_FLOW_* commands.
> @@ -459,12 +467,24 @@ enum ovs_flow_attr {
> OVS_FLOW_ATTR_MASK, /* Sequence of OVS_KEY_ATTR_* attributes. */
> OVS_FLOW_ATTR_PROBE, /* Flow operation is a feature probe, error
> * logging should be suppressed. */
> + OVS_FLOW_ATTR_UFID, /* Variable length unique flow identifier. */
> + OVS_FLOW_ATTR_UFID_FLAGS,/* u32 of OVS_UFID_F_*. */
> __OVS_FLOW_ATTR_MAX
> };
>
> #define OVS_FLOW_ATTR_MAX (__OVS_FLOW_ATTR_MAX - 1)
>
> /**
> + * Omit attributes for notifications.
> + *
> + * If a datapath request contains an %OVS_UFID_F_OMIT_* flag, then the datapath
> + * may omit the corresponding %OVS_FLOW_ATTR_* from the response.
> + */
> +#define OVS_UFID_F_OMIT_KEY (1 << 0)
> +#define OVS_UFID_F_OMIT_MASK (1 << 1)
> +#define OVS_UFID_F_OMIT_ACTIONS (1 << 2)
> +
> +/**
> * enum ovs_sample_attr - Attributes for %OVS_ACTION_ATTR_SAMPLE action.
> * @OVS_SAMPLE_ATTR_PROBABILITY: 32-bit fraction of packets to sample with
> * @OVS_ACTION_ATTR_SAMPLE. A value of 0 samples no packets, a value of
> diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
> index b2a3796..d54e920 100644
> --- a/net/openvswitch/datapath.c
> +++ b/net/openvswitch/datapath.c
> @@ -65,6 +65,8 @@ static struct genl_family dp_packet_genl_family;
> static struct genl_family dp_flow_genl_family;
> static struct genl_family dp_datapath_genl_family;
>
> +static const struct nla_policy flow_policy[];
> +
> static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
> .name = OVS_FLOW_MCGROUP,
> };
> @@ -662,11 +664,18 @@ static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
> }
> }
>
> -static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
> +static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
> + const struct sw_flow_id *sfid)
> {
> + size_t sfid_len = 0;
> +
> + if (sfid && sfid->ufid_len)
> + sfid_len = nla_total_size(sfid->ufid_len);
> +
Can you also use ufid_flags to determine exact msg size?
> return NLMSG_ALIGN(sizeof(struct ovs_header))
> + nla_total_size(ovs_key_attr_size()) /* OVS_FLOW_ATTR_KEY */
> + nla_total_size(ovs_key_attr_size()) /* OVS_FLOW_ATTR_MASK */
> + + sfid_len /* OVS_FLOW_ATTR_UFID */
> + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
> + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
> + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
> @@ -741,7 +750,7 @@ static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
> /* Called with ovs_mutex or RCU read lock. */
> static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
> struct sk_buff *skb, u32 portid,
> - u32 seq, u32 flags, u8 cmd)
> + u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
> {
> const int skb_orig_len = skb->len;
> struct ovs_header *ovs_header;
> @@ -754,21 +763,35 @@ static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
>
> ovs_header->dp_ifindex = dp_ifindex;
>
> - err = ovs_nla_put_unmasked_key(flow, skb);
> + if (flow->ufid)
> + err = nla_put(skb, OVS_FLOW_ATTR_UFID, flow->ufid->ufid_len,
> + flow->ufid->ufid);
> + else
> + err = ovs_nla_put_unmasked_key(flow, skb);
> if (err)
> goto error;
>
> - err = ovs_nla_put_mask(flow, skb);
> - if (err)
> - goto error;
> + if (!(ufid_flags & OVS_UFID_F_OMIT_KEY) && flow->ufid) {
> + err = ovs_nla_put_masked_key(flow, skb);
> + if (err)
> + goto error;
> + }
> +
> + if (!(ufid_flags & OVS_UFID_F_OMIT_MASK)) {
> + err = ovs_nla_put_mask(flow, skb);
> + if (err)
> + goto error;
> + }
>
> err = ovs_flow_cmd_fill_stats(flow, skb);
> if (err)
> goto error;
>
> - err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
> - if (err)
> - goto error;
> + if (!(ufid_flags & OVS_UFID_F_OMIT_ACTIONS)) {
> + err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
> + if (err)
> + goto error;
> + }
>
> return genlmsg_end(skb, ovs_header);
>
> @@ -779,6 +802,7 @@ error:
>
> /* May not be called with RCU read lock. */
> static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
> + const struct sw_flow_id *sfid,
> struct genl_info *info,
> bool always)
> {
> @@ -787,7 +811,8 @@ static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *act
> if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
> return NULL;
>
> - skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL);
> + skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts, sfid), info,
> + GFP_KERNEL);
> if (!skb)
> return ERR_PTR(-ENOMEM);
>
> @@ -798,19 +823,19 @@ static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *act
> static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
> int dp_ifindex,
> struct genl_info *info, u8 cmd,
> - bool always)
> + bool always, u32 ufid_flags)
> {
> struct sk_buff *skb;
> int retval;
>
> - skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info,
> - always);
> + skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
> + flow->ufid, info, always);
> if (IS_ERR_OR_NULL(skb))
> return skb;
>
> retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
> info->snd_portid, info->snd_seq, 0,
> - cmd);
> + cmd, ufid_flags);
> BUG_ON(retval < 0);
> return skb;
> }
> @@ -819,12 +844,14 @@ static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
> {
> struct nlattr **a = info->attrs;
> struct ovs_header *ovs_header = info->userhdr;
> - struct sw_flow *flow, *new_flow;
> + struct sw_flow *flow = NULL, *new_flow;
> struct sw_flow_mask mask;
> struct sk_buff *reply;
> struct datapath *dp;
> + struct sw_flow_key key;
> struct sw_flow_actions *acts;
> struct sw_flow_match match;
> + u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
> int error;
> bool log = !a[OVS_FLOW_ATTR_PROBE];
>
> @@ -849,13 +876,30 @@ static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
> }
>
> /* Extract key. */
> - ovs_match_init(&match, &new_flow->unmasked_key, &mask);
> + ovs_match_init(&match, &key, &mask);
> error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
> a[OVS_FLOW_ATTR_MASK], log);
> if (error)
> goto err_kfree_flow;
>
> - ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask);
> + ovs_flow_mask_key(&new_flow->key, &key, &mask);
> +
> + /* Extract flow id. */
> + error = ovs_nla_copy_ufid(a[OVS_FLOW_ATTR_UFID], &new_flow->ufid, log);
> + if (error)
> + goto err_kfree_flow;
Returning zero in case of no UFID is strange. Can you check for UFID
attribute and then copy ufid unconditionally?
> + if (!new_flow->ufid) {
> + struct sw_flow_key *new_key;
> +
> + new_key = kmalloc(sizeof(*new_flow->unmasked_key), GFP_KERNEL);
> + if (new_key) {
> + memcpy(new_key, &key, sizeof(key));
> + new_flow->unmasked_key = new_key;
> + } else {
> + error = -ENOMEM;
> + goto err_kfree_flow;
> + }
> + }
>
> /* Validate actions. */
> error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
> @@ -865,7 +909,7 @@ static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
> goto err_kfree_flow;
> }
>
> - reply = ovs_flow_cmd_alloc_info(acts, info, false);
> + reply = ovs_flow_cmd_alloc_info(acts, new_flow->ufid, info, false);
> if (IS_ERR(reply)) {
> error = PTR_ERR(reply);
> goto err_kfree_acts;
> @@ -877,8 +921,12 @@ static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
> error = -ENODEV;
> goto err_unlock_ovs;
> }
> +
> /* Check if this is a duplicate flow */
> - flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key);
> + if (new_flow->ufid)
> + flow = ovs_flow_tbl_lookup_ufid(&dp->table, new_flow->ufid);
> + if (!flow)
> + flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
Need tight checking, for example what if flow with UFID does not exist
in UFID table but it exist in flow-table? This can complicate
flow-update case where we can not assume UFID of new and old flow is
same.
> if (likely(!flow)) {
> rcu_assign_pointer(new_flow->sf_acts, acts);
>
> @@ -894,7 +942,8 @@ static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
> ovs_header->dp_ifindex,
> reply, info->snd_portid,
> info->snd_seq, 0,
> - OVS_FLOW_CMD_NEW);
> + OVS_FLOW_CMD_NEW,
> + ufid_flags);
> BUG_ON(error < 0);
> }
> ovs_unlock();
> @@ -912,11 +961,13 @@ static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
> error = -EEXIST;
> goto err_unlock_ovs;
> }
> - /* The unmasked key has to be the same for flow updates. */
> - if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
> - /* Look for any overlapping flow. */
> + /* The flow identifier has to be the same for flow updates.
> + * Look for any overlapping flow.
> + */
> + if (!flow->ufid &&
> + unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
> flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
> - if (!flow) {
> + if (unlikely(!flow)) {
> error = -ENOENT;
> goto err_unlock_ovs;
> }
> @@ -930,7 +981,8 @@ static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
> ovs_header->dp_ifindex,
> reply, info->snd_portid,
> info->snd_seq, 0,
> - OVS_FLOW_CMD_NEW);
> + OVS_FLOW_CMD_NEW,
> + ufid_flags);
> BUG_ON(error < 0);
> }
> ovs_unlock();
> @@ -980,45 +1032,34 @@ static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
> struct nlattr **a = info->attrs;
> struct ovs_header *ovs_header = info->userhdr;
> struct sw_flow_key key;
> - struct sw_flow *flow;
> + struct sw_flow *flow = NULL;
> struct sw_flow_mask mask;
> struct sk_buff *reply = NULL;
> struct datapath *dp;
> struct sw_flow_actions *old_acts = NULL, *acts = NULL;
> struct sw_flow_match match;
> + struct sw_flow_id *ufid;
> + u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
> int error;
> bool log = !a[OVS_FLOW_ATTR_PROBE];
>
> - /* Extract key. */
> - error = -EINVAL;
> - if (!a[OVS_FLOW_ATTR_KEY]) {
> + /* Extract identifier. Take a copy to avoid "Wframe-larger-than=1024"
> + * warning.
> + */
What if we limit the implementation of UFID to max 128 bit, does it
still gives you the warning?
> + error = ovs_nla_copy_ufid(a[OVS_FLOW_ATTR_UFID], &ufid, log);
> + if (error)
> + return error;
> + if (a[OVS_FLOW_ATTR_KEY]) {
> + ovs_match_init(&match, &key, &mask);
> + error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
> + a[OVS_FLOW_ATTR_MASK], log);
> + } else if (!ufid) {
> OVS_NLERR(log, "Flow key attribute not present in set flow.");
> - goto error;
> + error = -EINVAL;
> }
> -
> - ovs_match_init(&match, &key, &mask);
> - error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
> - a[OVS_FLOW_ATTR_MASK], log);
> if (error)
> goto error;
>
> - /* Validate actions. */
> - if (a[OVS_FLOW_ATTR_ACTIONS]) {
> - acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask,
> - log);
> - if (IS_ERR(acts)) {
> - error = PTR_ERR(acts);
> - goto error;
> - }
> -
> - /* Can allocate before locking if have acts. */
> - reply = ovs_flow_cmd_alloc_info(acts, info, false);
> - if (IS_ERR(reply)) {
> - error = PTR_ERR(reply);
> - goto err_kfree_acts;
> - }
> - }
> -
Why are you moving this action validation under ovs-lock?
> ovs_lock();
> dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
> if (unlikely(!dp)) {
> @@ -1026,33 +1067,34 @@ static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
> goto err_unlock_ovs;
> }
> /* Check that the flow exists. */
> - flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
> + if (ufid)
> + flow = ovs_flow_tbl_lookup_ufid(&dp->table, ufid);
> + else
> + flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
> if (unlikely(!flow)) {
> error = -ENOENT;
> goto err_unlock_ovs;
> }
>
> - /* Update actions, if present. */
> - if (likely(acts)) {
> + /* Validate and update actions. */
> + if (a[OVS_FLOW_ATTR_ACTIONS]) {
> + acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &flow->key,
> + flow->mask, log);
> + if (IS_ERR(acts)) {
> + error = PTR_ERR(acts);
> + goto err_unlock_ovs;
> + }
> +
> old_acts = ovsl_dereference(flow->sf_acts);
> rcu_assign_pointer(flow->sf_acts, acts);
> + }
>
> - if (unlikely(reply)) {
> - error = ovs_flow_cmd_fill_info(flow,
> - ovs_header->dp_ifindex,
> - reply, info->snd_portid,
> - info->snd_seq, 0,
> - OVS_FLOW_CMD_NEW);
> - BUG_ON(error < 0);
> - }
> - } else {
> - /* Could not alloc without acts before locking. */
> - reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
> - info, OVS_FLOW_CMD_NEW, false);
> - if (unlikely(IS_ERR(reply))) {
> - error = PTR_ERR(reply);
> - goto err_unlock_ovs;
> - }
> + reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
> + info, OVS_FLOW_CMD_NEW, false,
> + ufid_flags);
> + if (unlikely(IS_ERR(reply))) {
> + error = PTR_ERR(reply);
> + goto err_unlock_ovs;
> }
>
> /* Clear stats. */
> @@ -1070,9 +1112,9 @@ static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
> err_unlock_ovs:
> ovs_unlock();
> kfree_skb(reply);
> -err_kfree_acts:
> kfree(acts);
> error:
> + kfree(ufid);
> return error;
> }
>
> @@ -1085,17 +1127,23 @@ static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
> struct sw_flow *flow;
> struct datapath *dp;
> struct sw_flow_match match;
> + struct sw_flow_id ufid;
> + u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
> int err;
> bool log = !a[OVS_FLOW_ATTR_PROBE];
>
> - if (!a[OVS_FLOW_ATTR_KEY]) {
> + err = ovs_nla_get_ufid(a[OVS_FLOW_ATTR_UFID], &ufid, log);
> + if (err)
> + return err;
> + if (a[OVS_FLOW_ATTR_KEY]) {
> + ovs_match_init(&match, &key, NULL);
> + err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL,
> + log);
> + } else if (!ufid.ufid_len) {
> OVS_NLERR(log,
> "Flow get message rejected, Key attribute missing.");
> - return -EINVAL;
> + err = -EINVAL;
> }
> -
> - ovs_match_init(&match, &key, NULL);
> - err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL, log);
> if (err)
> return err;
>
> @@ -1106,14 +1154,17 @@ static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
> goto unlock;
> }
>
> - flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
> + if (ufid.ufid_len)
> + flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
> + else
> + flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
> if (!flow) {
> err = -ENOENT;
> goto unlock;
> }
>
> reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
> - OVS_FLOW_CMD_NEW, true);
> + OVS_FLOW_CMD_NEW, true, ufid_flags);
> if (IS_ERR(reply)) {
> err = PTR_ERR(reply);
> goto unlock;
> @@ -1132,13 +1183,18 @@ static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
> struct ovs_header *ovs_header = info->userhdr;
> struct sw_flow_key key;
> struct sk_buff *reply;
> - struct sw_flow *flow;
> + struct sw_flow *flow = NULL;
> struct datapath *dp;
> struct sw_flow_match match;
> + struct sw_flow_id ufid;
> + u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
> int err;
> bool log = !a[OVS_FLOW_ATTR_PROBE];
>
> - if (likely(a[OVS_FLOW_ATTR_KEY])) {
> + err = ovs_nla_get_ufid(a[OVS_FLOW_ATTR_UFID], &ufid, log);
> + if (err)
> + return err;
> + if (a[OVS_FLOW_ATTR_KEY]) {
> ovs_match_init(&match, &key, NULL);
> err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL,
> log);
> @@ -1153,12 +1209,15 @@ static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
> goto unlock;
> }
>
> - if (unlikely(!a[OVS_FLOW_ATTR_KEY])) {
> + if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid.ufid_len)) {
> err = ovs_flow_tbl_flush(&dp->table);
> goto unlock;
> }
>
> - flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
> + if (ufid.ufid_len)
> + flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
> + else
> + flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
> if (unlikely(!flow)) {
> err = -ENOENT;
> goto unlock;
> @@ -1168,14 +1227,15 @@ static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
> ovs_unlock();
>
> reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
> - info, false);
> + flow->ufid, info, false);
> if (likely(reply)) {
> if (likely(!IS_ERR(reply))) {
> rcu_read_lock(); /*To keep RCU checker happy. */
> err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
> reply, info->snd_portid,
> info->snd_seq, 0,
> - OVS_FLOW_CMD_DEL);
> + OVS_FLOW_CMD_DEL,
> + ufid_flags);
> rcu_read_unlock();
> BUG_ON(err < 0);
>
> @@ -1194,9 +1254,18 @@ unlock:
>
> static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
> {
> + struct nlattr *a[__OVS_FLOW_ATTR_MAX];
> struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
> struct table_instance *ti;
> struct datapath *dp;
> + u32 ufid_flags;
> + int err;
> +
> + err = nlmsg_parse(cb->nlh, GENL_HDRLEN + dp_flow_genl_family.hdrsize,
> + a, dp_flow_genl_family.maxattr, flow_policy);
Can you add genl helper function for this?
> + if (err)
> + return err;
> + ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
>
> rcu_read_lock();
> dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
> @@ -1219,7 +1288,7 @@ static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
> if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
> NETLINK_CB(cb->skb).portid,
> cb->nlh->nlmsg_seq, NLM_F_MULTI,
> - OVS_FLOW_CMD_NEW) < 0)
> + OVS_FLOW_CMD_NEW, ufid_flags) < 0)
> break;
>
> cb->args[0] = bucket;
> @@ -1235,6 +1304,8 @@ static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
> [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
> [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
> [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
> + [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC },
> + [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
> };
>
> static const struct genl_ops dp_flow_genl_ops[] = {
> diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
> index a8b30f3..7f31dbf 100644
> --- a/net/openvswitch/flow.h
> +++ b/net/openvswitch/flow.h
> @@ -197,6 +197,13 @@ struct sw_flow_match {
> struct sw_flow_mask *mask;
> };
>
> +#define MAX_UFID_LENGTH 256
> +
For now we can limit this to 128 bits.
> +struct sw_flow_id {
> + u32 ufid_len;
> + u32 ufid[MAX_UFID_LENGTH / 4];
> +};
> +
> struct sw_flow_actions {
> struct rcu_head rcu;
> u32 actions_len;
> @@ -213,13 +220,16 @@ struct flow_stats {
>
> struct sw_flow {
> struct rcu_head rcu;
> - struct hlist_node hash_node[2];
> - u32 hash;
> + struct {
> + struct hlist_node node[2];
> + u32 hash;
> + } flow_hash, ufid_hash;
I am not sure about _hash suffix here, Can you explain it? I think
_table is better.
> int stats_last_writer; /* NUMA-node id of the last writer on
> * 'stats[0]'.
> */
> struct sw_flow_key key;
> - struct sw_flow_key unmasked_key;
> + struct sw_flow_id *ufid;
Lets move this structure inside sw_flow, so that we can avoid one
kmalloc during flow-install in case of UFID. something like:
struct {
u32 ufid_len;
union {
u32 ufid[MAX_UFID_LENGTH / 4];
struct sw_flow_key *unmasked_key;
}
} id;
> + struct sw_flow_key *unmasked_key; /* Only valid if 'ufid' is NULL. */
> struct sw_flow_mask *mask;
> struct sw_flow_actions __rcu *sf_acts;
> struct flow_stats __rcu *stats[]; /* One for each NUMA node. First one
> diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
> index 7bb571f..56a5d2e 100644
> --- a/net/openvswitch/flow_netlink.c
> +++ b/net/openvswitch/flow_netlink.c
> @@ -1095,6 +1095,67 @@ free_newmask:
> return err;
> }
>
> +static size_t get_ufid_size(const struct nlattr *attr, bool log)
> +{
> + if (!attr)
> + return 0;
> + if (!nla_len(attr)) {
> + OVS_NLERR(log, "Flow ufid must be at least 1 octet");
> + return -EINVAL;
> + }
> + if (nla_len(attr) >= MAX_UFID_LENGTH) {
> + OVS_NLERR(log, "Flow ufid size %u bytes exceeds max",
> + nla_len(attr));
> + return -EINVAL;
> + }
> +
> + return nla_len(attr);
> +}
> +
> +/* Initializes 'flow->ufid'. */
> +int ovs_nla_get_ufid(const struct nlattr *attr, struct sw_flow_id *sfid,
> + bool log)
> +{
> + size_t len;
> +
> + sfid->ufid_len = 0;
> + len = get_ufid_size(attr, log);
> + if (len <= 0)
> + return len;
> +
> + sfid->ufid_len = len;
> + memcpy(sfid->ufid, nla_data(attr), len);
> +
> + return 0;
> +}
> +
> +int ovs_nla_copy_ufid(const struct nlattr *attr, struct sw_flow_id **sfid,
> + bool log)
> +{
> + struct sw_flow_id *new_sfid = NULL;
> + size_t len;
> +
> + *sfid = NULL;
> + len = get_ufid_size(attr, log);
> + if (len <= 0)
> + return len;
> +
> + new_sfid = kmalloc(sizeof(*new_sfid), GFP_KERNEL);
> + if (!new_sfid)
> + return -ENOMEM;
> +
> + new_sfid->ufid_len = len;
> + memcpy(new_sfid->ufid, nla_data(attr), len);
> + *sfid = new_sfid;
> +
> + return 0;
> +}
> +
> +u32 ovs_nla_get_ufid_flags(const struct nlattr *attr)
> +{
> + return attr ? nla_get_u32(attr) : 0;
> +}
> +
> /**
> * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
> * @key: Receives extracted in_port, priority, tun_key and skb_mark.
> @@ -1367,7 +1428,7 @@ int ovs_nla_put_flow(const struct sw_flow_key *swkey,
> /* Called with ovs_mutex or RCU read lock. */
> int ovs_nla_put_unmasked_key(const struct sw_flow *flow, struct sk_buff *skb)
> {
> - return ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key,
> + return ovs_nla_put_flow(flow->unmasked_key, flow->unmasked_key,
> OVS_FLOW_ATTR_KEY, false, skb);
> }
>
> diff --git a/net/openvswitch/flow_netlink.h b/net/openvswitch/flow_netlink.h
> index ea54564..4f1bd7a 100644
> --- a/net/openvswitch/flow_netlink.h
> +++ b/net/openvswitch/flow_netlink.h
> @@ -57,6 +57,10 @@ int ovs_nla_get_match(struct sw_flow_match *, const struct nlattr *key,
> int ovs_nla_put_egress_tunnel_key(struct sk_buff *,
> const struct ovs_tunnel_info *);
>
> +int ovs_nla_get_ufid(const struct nlattr *, struct sw_flow_id *, bool log);
> +int ovs_nla_copy_ufid(const struct nlattr *, struct sw_flow_id **, bool log);
> +u32 ovs_nla_get_ufid_flags(const struct nlattr *attr);
> +
> int ovs_nla_copy_actions(const struct nlattr *attr,
> const struct sw_flow_key *key,
> struct sw_flow_actions **sfa, bool log);
> diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c
> index e0a7fef..7287805 100644
> --- a/net/openvswitch/flow_table.c
> +++ b/net/openvswitch/flow_table.c
> @@ -85,6 +85,8 @@ struct sw_flow *ovs_flow_alloc(void)
>
> flow->sf_acts = NULL;
> flow->mask = NULL;
> + flow->ufid = NULL;
> + flow->unmasked_key = NULL;
> flow->stats_last_writer = NUMA_NO_NODE;
>
> /* Initialize the default stat node. */
> @@ -139,6 +141,8 @@ static void flow_free(struct sw_flow *flow)
> {
> int node;
>
> + kfree(flow->ufid);
> + kfree(flow->unmasked_key);
> kfree((struct sw_flow_actions __force *)flow->sf_acts);
> for_each_node(node)
> if (flow->stats[node])
> @@ -200,18 +204,28 @@ static struct table_instance *table_instance_alloc(int new_size)
>
> int ovs_flow_tbl_init(struct flow_table *table)
> {
> - struct table_instance *ti;
> + struct table_instance *ti, *ufid_ti;
>
> ti = table_instance_alloc(TBL_MIN_BUCKETS);
>
> if (!ti)
> return -ENOMEM;
>
> + ufid_ti = table_instance_alloc(TBL_MIN_BUCKETS);
> + if (!ufid_ti)
> + goto free_ti;
> +
> rcu_assign_pointer(table->ti, ti);
> + rcu_assign_pointer(table->ufid_ti, ufid_ti);
> INIT_LIST_HEAD(&table->mask_list);
> table->last_rehash = jiffies;
> table->count = 0;
> + table->ufid_count = 0;
> return 0;
> +
> +free_ti:
> + __table_instance_destroy(ti);
> + return -ENOMEM;
> }
>
> static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu)
> @@ -221,13 +235,16 @@ static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu)
> __table_instance_destroy(ti);
> }
>
> -static void table_instance_destroy(struct table_instance *ti, bool deferred)
> +static void table_instance_destroy(struct table_instance *ti,
> + struct table_instance *ufid_ti,
> + bool deferred)
> {
> int i;
>
> if (!ti)
> return;
>
> + BUG_ON(!ufid_ti);
> if (ti->keep_flows)
> goto skip_flows;
>
> @@ -236,18 +253,24 @@ static void table_instance_destroy(struct table_instance *ti, bool deferred)
> struct hlist_head *head = flex_array_get(ti->buckets, i);
> struct hlist_node *n;
> int ver = ti->node_ver;
> + int ufid_ver = ufid_ti->node_ver;
>
> - hlist_for_each_entry_safe(flow, n, head, hash_node[ver]) {
> - hlist_del_rcu(&flow->hash_node[ver]);
> + hlist_for_each_entry_safe(flow, n, head, flow_hash.node[ver]) {
> + hlist_del_rcu(&flow->flow_hash.node[ver]);
> + if (flow->ufid)
> + hlist_del_rcu(&flow->ufid_hash.node[ufid_ver]);
> ovs_flow_free(flow, deferred);
> }
> }
>
> skip_flows:
> - if (deferred)
> + if (deferred) {
> call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb);
> - else
> + call_rcu(&ufid_ti->rcu, flow_tbl_destroy_rcu_cb);
> + } else {
> __table_instance_destroy(ti);
> + __table_instance_destroy(ufid_ti);
> + }
> }
>
> /* No need for locking this function is called from RCU callback or
> @@ -256,8 +279,9 @@ skip_flows:
> void ovs_flow_tbl_destroy(struct flow_table *table)
> {
> struct table_instance *ti = rcu_dereference_raw(table->ti);
> + struct table_instance *ufid_ti = rcu_dereference_raw(table->ufid_ti);
>
> - table_instance_destroy(ti, false);
> + table_instance_destroy(ti, ufid_ti, false);
> }
>
> struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *ti,
> @@ -272,7 +296,7 @@ struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *ti,
> while (*bucket < ti->n_buckets) {
> i = 0;
> head = flex_array_get(ti->buckets, *bucket);
> - hlist_for_each_entry_rcu(flow, head, hash_node[ver]) {
> + hlist_for_each_entry_rcu(flow, head, flow_hash.node[ver]) {
> if (i < *last) {
> i++;
> continue;
> @@ -294,16 +318,26 @@ static struct hlist_head *find_bucket(struct table_instance *ti, u32 hash)
> (hash & (ti->n_buckets - 1)));
> }
>
> -static void table_instance_insert(struct table_instance *ti, struct sw_flow *flow)
> +static void table_instance_insert(struct table_instance *ti,
> + struct sw_flow *flow)
> +{
> + struct hlist_head *head;
> +
> + head = find_bucket(ti, flow->flow_hash.hash);
> + hlist_add_head_rcu(&flow->flow_hash.node[ti->node_ver], head);
> +}
> +
> +static void ufid_table_instance_insert(struct table_instance *ti,
> + struct sw_flow *flow)
> {
> struct hlist_head *head;
>
> - head = find_bucket(ti, flow->hash);
> - hlist_add_head_rcu(&flow->hash_node[ti->node_ver], head);
> + head = find_bucket(ti, flow->ufid_hash.hash);
> + hlist_add_head_rcu(&flow->ufid_hash.node[ti->node_ver], head);
> }
>
> static void flow_table_copy_flows(struct table_instance *old,
> - struct table_instance *new)
> + struct table_instance *new, bool ufid)
> {
> int old_ver;
> int i;
> @@ -318,15 +352,21 @@ static void flow_table_copy_flows(struct table_instance *old,
>
> head = flex_array_get(old->buckets, i);
>
> - hlist_for_each_entry(flow, head, hash_node[old_ver])
> - table_instance_insert(new, flow);
> + if (ufid)
> + hlist_for_each_entry(flow, head,
> + ufid_hash.node[old_ver])
> + ufid_table_instance_insert(new, flow);
> + else
> + hlist_for_each_entry(flow, head,
> + flow_hash.node[old_ver])
> + table_instance_insert(new, flow);
> }
>
> old->keep_flows = true;
> }
>
> static struct table_instance *table_instance_rehash(struct table_instance *ti,
> - int n_buckets)
> + int n_buckets, bool ufid)
> {
> struct table_instance *new_ti;
>
> @@ -334,27 +374,37 @@ static struct table_instance *table_instance_rehash(struct table_instance *ti,
> if (!new_ti)
> return NULL;
>
> - flow_table_copy_flows(ti, new_ti);
> -
> + flow_table_copy_flows(ti, new_ti, ufid);
> return new_ti;
> }
>
> int ovs_flow_tbl_flush(struct flow_table *flow_table)
> {
> - struct table_instance *old_ti;
> - struct table_instance *new_ti;
> + struct table_instance *old_ti, *new_ti;
> + struct table_instance *old_ufid_ti, *new_ufid_ti;
>
> - old_ti = ovsl_dereference(flow_table->ti);
> new_ti = table_instance_alloc(TBL_MIN_BUCKETS);
> if (!new_ti)
> return -ENOMEM;
> + new_ufid_ti = table_instance_alloc(TBL_MIN_BUCKETS);
> + if (!new_ufid_ti)
> + goto err_free_ti;
> +
> + old_ti = ovsl_dereference(flow_table->ti);
> + old_ufid_ti = ovsl_dereference(flow_table->ufid_ti);
>
> rcu_assign_pointer(flow_table->ti, new_ti);
> + rcu_assign_pointer(flow_table->ufid_ti, new_ufid_ti);
> flow_table->last_rehash = jiffies;
> flow_table->count = 0;
> + flow_table->ufid_count = 0;
>
> - table_instance_destroy(old_ti, true);
> + table_instance_destroy(old_ti, old_ufid_ti, true);
> return 0;
> +
> +err_free_ti:
> + __table_instance_destroy(new_ti);
> + return -ENOMEM;
> }
>
> static u32 flow_hash(const struct sw_flow_key *key, int key_start,
> @@ -407,7 +457,8 @@ bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
> int key_start = flow_key_start(key);
> int key_end = match->range.end;
>
> - return cmp_key(&flow->unmasked_key, key, key_start, key_end);
> + BUG_ON(flow->ufid);
> + return cmp_key(flow->unmasked_key, key, key_start, key_end);
> }
>
> static struct sw_flow *masked_flow_lookup(struct table_instance *ti,
> @@ -424,10 +475,9 @@ static struct sw_flow *masked_flow_lookup(struct table_instance *ti,
> ovs_flow_mask_key(&masked_key, unmasked, mask);
> hash = flow_hash(&masked_key, key_start, key_end);
> head = find_bucket(ti, hash);
> - hlist_for_each_entry_rcu(flow, head, hash_node[ti->node_ver]) {
> - if (flow->mask == mask && flow->hash == hash &&
> - flow_cmp_masked_key(flow, &masked_key,
> - key_start, key_end))
> + hlist_for_each_entry_rcu(flow, head, flow_hash.node[ti->node_ver]) {
> + if (flow->mask == mask && flow->flow_hash.hash == hash &&
> + flow_cmp_masked_key(flow, &masked_key, key_start, key_end))
> return flow;
> }
> return NULL;
> @@ -469,7 +519,40 @@ struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl,
> /* Always called under ovs-mutex. */
> list_for_each_entry(mask, &tbl->mask_list, list) {
> flow = masked_flow_lookup(ti, match->key, mask);
> - if (flow && ovs_flow_cmp_unmasked_key(flow, match)) /* Found */
> + if (flow && !flow->ufid &&
why not NULL check for flow->unmasked_key here rather than ufid?
> + ovs_flow_cmp_unmasked_key(flow, match))
> + return flow;
> + }
> + return NULL;
> +}
> +
> +static u32 ufid_hash(const struct sw_flow_id *sfid)
> +{
> + return arch_fast_hash(sfid->ufid, sfid->ufid_len, 0);
> +}
> +
> +bool ovs_flow_cmp_ufid(const struct sw_flow *flow,
> + const struct sw_flow_id *sfid)
> +{
> + if (flow->ufid->ufid_len != sfid->ufid_len)
> + return false;
> +
> + return !memcmp(flow->ufid->ufid, sfid->ufid, sfid->ufid_len);
> +}
> +
> +struct sw_flow *ovs_flow_tbl_lookup_ufid(struct flow_table *tbl,
> + const struct sw_flow_id *ufid)
> +{
> + struct table_instance *ti = rcu_dereference_ovsl(tbl->ufid_ti);
> + struct sw_flow *flow;
> + struct hlist_head *head;
> + u32 hash;
> +
> + hash = ufid_hash(ufid);
> + head = find_bucket(ti, hash);
> + hlist_for_each_entry_rcu(flow, head, ufid_hash.node[ti->node_ver]) {
> + if (flow->ufid_hash.hash == hash &&
> + ovs_flow_cmp_ufid(flow, ufid))
> return flow;
> }
> return NULL;
> @@ -486,9 +569,10 @@ int ovs_flow_tbl_num_masks(const struct flow_table *table)
> return num;
> }
>
> -static struct table_instance *table_instance_expand(struct table_instance *ti)
> +static struct table_instance *table_instance_expand(struct table_instance *ti,
> + bool ufid)
> {
> - return table_instance_rehash(ti, ti->n_buckets * 2);
> + return table_instance_rehash(ti, ti->n_buckets * 2, ufid);
> }
>
> /* Remove 'mask' from the mask list, if it is not needed any more. */
> @@ -513,10 +597,15 @@ static void flow_mask_remove(struct flow_table *tbl, struct sw_flow_mask *mask)
> void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow)
> {
> struct table_instance *ti = ovsl_dereference(table->ti);
> + struct table_instance *ufid_ti = ovsl_dereference(table->ufid_ti);
>
> BUG_ON(table->count == 0);
> - hlist_del_rcu(&flow->hash_node[ti->node_ver]);
> + hlist_del_rcu(&flow->flow_hash.node[ti->node_ver]);
> table->count--;
> + if (flow->ufid) {
> + hlist_del_rcu(&flow->ufid_hash.node[ufid_ti->node_ver]);
> + table->ufid_count--;
> + }
>
> /* RCU delete the mask. 'flow->mask' is not NULLed, as it should be
> * accessible as long as the RCU read lock is held.
> @@ -585,34 +674,65 @@ static int flow_mask_insert(struct flow_table *tbl, struct sw_flow *flow,
> }
>
> /* Must be called with OVS mutex held. */
> -int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
> - const struct sw_flow_mask *mask)
> +static void flow_key_insert(struct flow_table *table, struct sw_flow *flow)
> {
> struct table_instance *new_ti = NULL;
> struct table_instance *ti;
> - int err;
>
> - err = flow_mask_insert(table, flow, mask);
> - if (err)
> - return err;
> -
> - flow->hash = flow_hash(&flow->key, flow->mask->range.start,
> - flow->mask->range.end);
> + flow->flow_hash.hash = flow_hash(&flow->key, flow->mask->range.start,
> + flow->mask->range.end);
> ti = ovsl_dereference(table->ti);
> table_instance_insert(ti, flow);
> table->count++;
>
> /* Expand table, if necessary, to make room. */
> if (table->count > ti->n_buckets)
> - new_ti = table_instance_expand(ti);
> + new_ti = table_instance_expand(ti, false);
> else if (time_after(jiffies, table->last_rehash + REHASH_INTERVAL))
> - new_ti = table_instance_rehash(ti, ti->n_buckets);
> + new_ti = table_instance_rehash(ti, ti->n_buckets, false);
>
> if (new_ti) {
> rcu_assign_pointer(table->ti, new_ti);
> - table_instance_destroy(ti, true);
> + call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb);
> table->last_rehash = jiffies;
> }
> +}
> +
> +/* Must be called with OVS mutex held. */
> +static void flow_ufid_insert(struct flow_table *table, struct sw_flow *flow)
> +{
> + struct table_instance *ti;
> +
> + flow->ufid_hash.hash = ufid_hash(flow->ufid);
> + ti = ovsl_dereference(table->ufid_ti);
> + ufid_table_instance_insert(ti, flow);
> + table->ufid_count++;
> +
> + /* Expand table, if necessary, to make room. */
> + if (table->ufid_count > ti->n_buckets) {
> + struct table_instance *new_ti;
> +
> + new_ti = table_instance_expand(ti, true);
> + if (new_ti) {
> + rcu_assign_pointer(table->ufid_ti, new_ti);
> + call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb);
> + }
> + }
> +}
> +
> +/* Must be called with OVS mutex held. */
> +int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
> + const struct sw_flow_mask *mask)
> +{
> + int err;
> +
> + err = flow_mask_insert(table, flow, mask);
> + if (err)
> + return err;
> + flow_key_insert(table, flow);
> + if (flow->ufid)
> + flow_ufid_insert(table, flow);
> +
> return 0;
> }
>
> diff --git a/net/openvswitch/flow_table.h b/net/openvswitch/flow_table.h
> index 309fa64..454ef92 100644
> --- a/net/openvswitch/flow_table.h
> +++ b/net/openvswitch/flow_table.h
> @@ -47,9 +47,11 @@ struct table_instance {
>
> struct flow_table {
> struct table_instance __rcu *ti;
> + struct table_instance __rcu *ufid_ti;
> struct list_head mask_list;
> unsigned long last_rehash;
> unsigned int count;
> + unsigned int ufid_count;
> };
>
> extern struct kmem_cache *flow_stats_cache;
> @@ -78,8 +80,13 @@ struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *,
> const struct sw_flow_key *);
> struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl,
> const struct sw_flow_match *match);
> +struct sw_flow *ovs_flow_tbl_lookup_ufid(struct flow_table *,
> + const struct sw_flow_id *);
> +
> bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
> const struct sw_flow_match *match);
> +bool ovs_flow_cmp_ufid(const struct sw_flow *flow,
> + const struct sw_flow_id *sfid);
>
> void ovs_flow_mask_key(struct sw_flow_key *dst, const struct sw_flow_key *src,
> const struct sw_flow_mask *mask);
> --
> 1.7.10.4
>
--
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