Release 4.11 drivers/net/wireless/intel/iwlwifi/mvm/sta.h
/******************************************************************************
*
* This file is provided under a dual BSD/GPLv2 license. When using or
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* GPL LICENSE SUMMARY
*
* Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
* Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
* Copyright(c) 2015 - 2016 Intel Deutschland GmbH
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* Intel Linux Wireless <linuxwifi@intel.com>
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*
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* Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
* Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
* Copyright(c) 2015 - 2016 Intel Deutschland GmbH
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#ifndef __sta_h__
#define __sta_h__
#include <linux/spinlock.h>
#include <net/mac80211.h>
#include <linux/wait.h>
#include "iwl-trans.h" /* for IWL_MAX_TID_COUNT */
#include "fw-api.h" /* IWL_MVM_STATION_COUNT */
#include "rs.h"
struct iwl_mvm;
struct iwl_mvm_vif;
/**
* DOC: DQA - Dynamic Queue Allocation -introduction
*
* Dynamic Queue Allocation (AKA "DQA") is a feature implemented in iwlwifi
* driver to allow dynamic allocation of queues on-demand, rather than allocate
* them statically ahead of time. Ideally, we would like to allocate one queue
* per RA/TID, thus allowing an AP - for example - to send BE traffic to STA2
* even if it also needs to send traffic to a sleeping STA1, without being
* blocked by the sleeping station.
*
* Although the queues in DQA mode are dynamically allocated, there are still
* some queues that are statically allocated:
* TXQ #0 - command queue
* TXQ #1 - aux frames
* TXQ #2 - P2P device frames
* TXQ #3 - P2P GO/SoftAP GCAST/BCAST frames
* TXQ #4 - BSS DATA frames queue
* TXQ #5-8 - Non-QoS and MGMT frames queue pool
* TXQ #9 - P2P GO/SoftAP probe responses
* TXQ #10-31 - DATA frames queue pool
* The queues are dynamically taken from either the MGMT frames queue pool or
* the DATA frames one. See the %iwl_mvm_dqa_txq for more information on every
* queue.
*
* When a frame for a previously unseen RA/TID comes in, it needs to be deferred
* until a queue is allocated for it, and only then can be TXed. Therefore, it
* is placed into %iwl_mvm_tid_data.deferred_tx_frames, and a worker called
* %mvm->add_stream_wk later allocates the queues and TXes the deferred frames.
*
* For convenience, MGMT is considered as if it has TID=8, and go to the MGMT
* queues in the pool. If there is no longer a free MGMT queue to allocate, a
* queue will be allocated from the DATA pool instead. Since QoS NDPs can create
* a problem for aggregations, they too will use a MGMT queue.
*
* When adding a STA, a DATA queue is reserved for it so that it can TX from
* it. If no such free queue exists for reserving, the STA addition will fail.
*
* If the DATA queue pool gets exhausted, no new STA will be accepted, and if a
* new RA/TID comes in for an existing STA, one of the STA's queues will become
* shared and will serve more than the single TID (but always for the same RA!).
*
* When a RA/TID needs to become aggregated, no new queue is required to be
* allocated, only mark the queue as aggregated via the ADD_STA command. Note,
* however, that a shared queue cannot be aggregated, and only after the other
* TIDs become inactive and are removed - only then can the queue be
* reconfigured and become aggregated.
*
* When removing a station, its queues are returned to the pool for reuse. Here
* we also need to make sure that we are synced with the worker thread that TXes
* the deferred frames so we don't get into a situation where the queues are
* removed and then the worker puts deferred frames onto the released queues or
* tries to allocate new queues for a STA we don't need anymore.
*/
/**
* DOC: station table - introduction
*
* The station table is a list of data structure that reprensent the stations.
* In STA/P2P client mode, the driver will hold one station for the AP/ GO.
* In GO/AP mode, the driver will have as many stations as associated clients.
* All these stations are reflected in the fw's station table. The driver
* keeps the fw's station table up to date with the ADD_STA command. Stations
* can be removed by the REMOVE_STA command.
*
* All the data related to a station is held in the structure %iwl_mvm_sta
* which is embed in the mac80211's %ieee80211_sta (in the drv_priv) area.
* This data includes the index of the station in the fw, per tid information
* (sequence numbers, Block-ack state machine, etc...). The stations are
* created and deleted by the %sta_state callback from %ieee80211_ops.
*
* The driver holds a map: %fw_id_to_mac_id that allows to fetch a
* %ieee80211_sta (and the %iwl_mvm_sta embedded into it) based on a fw
* station index. That way, the driver is able to get the tid related data in
* O(1) in time sensitive paths (Tx / Tx response / BA notification). These
* paths are triggered by the fw, and the driver needs to get a pointer to the
* %ieee80211 structure. This map helps to get that pointer quickly.
*/
/**
* DOC: station table - locking
*
* As stated before, the station is created / deleted by mac80211's %sta_state
* callback from %ieee80211_ops which can sleep. The next paragraph explains
* the locking of a single stations, the next ones relates to the station
* table.
*
* The station holds the sequence number per tid. So this data needs to be
* accessed in the Tx path (which is softIRQ). It also holds the Block-Ack
* information (the state machine / and the logic that checks if the queues
* were drained), so it also needs to be accessible from the Tx response flow.
* In short, the station needs to be access from sleepable context as well as
* from tasklets, so the station itself needs a spinlock.
*
* The writers of %fw_id_to_mac_id map are serialized by the global mutex of
* the mvm op_mode. This is possible since %sta_state can sleep.
* The pointers in this map are RCU protected, hence we won't replace the
* station while we have Tx / Tx response / BA notification running.
*
* If a station is deleted while it still has packets in its A-MPDU queues,
* then the reclaim flow will notice that there is no station in the map for
* sta_id and it will dump the responses.
*/
/**
* DOC: station table - internal stations
*
* The FW needs a few internal stations that are not reflected in
* mac80211, such as broadcast station in AP / GO mode, or AUX sta for
* scanning and P2P device (during the GO negotiation).
* For these kind of stations we have %iwl_mvm_int_sta struct which holds the
* data relevant for them from both %iwl_mvm_sta and %ieee80211_sta.
* Usually the data for these stations is static, so no locking is required,
* and no TID data as this is also not needed.
* One thing to note, is that these stations have an ID in the fw, but not
* in mac80211. In order to "reserve" them a sta_id in %fw_id_to_mac_id
* we fill ERR_PTR(EINVAL) in this mapping and all other dereferencing of
* pointers from this mapping need to check that the value is not error
* or NULL.
*
* Currently there is only one auxiliary station for scanning, initialized
* on init.
*/
/**
* DOC: station table - AP Station in STA mode
*
* %iwl_mvm_vif includes the index of the AP station in the fw's STA table:
* %ap_sta_id. To get the point to the corresponding %ieee80211_sta,
* &fw_id_to_mac_id can be used. Due to the way the fw works, we must not remove
* the AP station from the fw before setting the MAC context as unassociated.
* Hence, %fw_id_to_mac_id[%ap_sta_id] will be NULLed when the AP station is
* removed by mac80211, but the station won't be removed in the fw until the
* VIF is set as unassociated. Then, %ap_sta_id will be invalidated.
*/
/**
* DOC: station table - Drain vs. Flush
*
* Flush means that all the frames in the SCD queue are dumped regardless the
* station to which they were sent. We do that when we disassociate and before
* we remove the STA of the AP. The flush can be done synchronously against the
* fw.
* Drain means that the fw will drop all the frames sent to a specific station.
* This is useful when a client (if we are IBSS / GO or AP) disassociates. In
* that case, we need to drain all the frames for that client from the AC queues
* that are shared with the other clients. Only then, we can remove the STA in
* the fw. In order to do so, we track the non-AMPDU packets for each station.
* If mac80211 removes a STA and if it still has non-AMPDU packets pending in
* the queues, we mark this station as %EBUSY in %fw_id_to_mac_id, and drop all
* the frames for this STA (%iwl_mvm_rm_sta). When the last frame is dropped
* (we know about it with its Tx response), we remove the station in fw and set
* it as %NULL in %fw_id_to_mac_id: this is the purpose of
* %iwl_mvm_sta_drained_wk.
*/
/**
* DOC: station table - fw restart
*
* When the fw asserts, or we have any other issue that requires to reset the
* driver, we require mac80211 to reconfigure the driver. Since the private
* data of the stations is embed in mac80211's %ieee80211_sta, that data will
* not be zeroed and needs to be reinitialized manually.
* %IWL_MVM_STATUS_IN_HW_RESTART is set during restart and that will hint us
* that we must not allocate a new sta_id but reuse the previous one. This
* means that the stations being re-added after the reset will have the same
* place in the fw as before the reset. We do need to zero the %fw_id_to_mac_id
* map, since the stations aren't in the fw any more. Internal stations that
* are not added by mac80211 will be re-added in the init flow that is called
* after the restart: mac80211 call's %iwl_mvm_mac_start which calls to
* %iwl_mvm_up.
*/
/**
* DOC: AP mode - PS
*
* When a station is asleep, the fw will set it as "asleep". All frames on
* shared queues (i.e. non-aggregation queues) to that station will be dropped
* by the fw (%TX_STATUS_FAIL_DEST_PS failure code).
*
* AMPDUs are in a separate queue that is stopped by the fw. We just need to
* let mac80211 know when there are frames in these queues so that it can
* properly handle trigger frames.
*
* When a trigger frame is received, mac80211 tells the driver to send frames
* from the AMPDU queues or sends frames to non-aggregation queues itself,
* depending on which ACs are delivery-enabled and what TID has frames to
* transmit. Note that mac80211 has all the knowledge since all the non-agg
* frames are buffered / filtered, and the driver tells mac80211 about agg
* frames). The driver needs to tell the fw to let frames out even if the
* station is asleep. This is done by %iwl_mvm_sta_modify_sleep_tx_count.
*
* When we receive a frame from that station with PM bit unset, the driver
* needs to let the fw know that this station isn't asleep any more. This is
* done by %iwl_mvm_sta_modify_ps_wake in response to mac80211 signaling the
* station's wakeup.
*
* For a GO, the Service Period might be cut short due to an absence period
* of the GO. In this (and all other cases) the firmware notifies us with the
* EOSP_NOTIFICATION, and we notify mac80211 of that. Further frames that we
* already sent to the device will be rejected again.
*
* See also "AP support for powersaving clients" in mac80211.h.
*/
/**
* enum iwl_mvm_agg_state
*
* The state machine of the BA agreement establishment / tear down.
* These states relate to a specific RA / TID.
*
* @IWL_AGG_OFF: aggregation is not used
* @IWL_AGG_STARTING: aggregation are starting (between start and oper)
* @IWL_AGG_ON: aggregation session is up
* @IWL_EMPTYING_HW_QUEUE_ADDBA: establishing a BA session - waiting for the
* HW queue to be empty from packets for this RA /TID.
* @IWL_EMPTYING_HW_QUEUE_DELBA: tearing down a BA session - waiting for the
* HW queue to be empty from packets for this RA /TID.
*/
enum iwl_mvm_agg_state {
IWL_AGG_OFF = 0,
IWL_AGG_STARTING,
IWL_AGG_ON,
IWL_EMPTYING_HW_QUEUE_ADDBA,
IWL_EMPTYING_HW_QUEUE_DELBA,
};
/**
* struct iwl_mvm_tid_data - holds the states for each RA / TID
* @deferred_tx_frames: deferred TX frames for this RA/TID
* @seq_number: the next WiFi sequence number to use
* @next_reclaimed: the WiFi sequence number of the next packet to be acked.
* This is basically (last acked packet++).
* @rate_n_flags: Rate at which Tx was attempted. Holds the data between the
* Tx response (TX_CMD), and the block ack notification (COMPRESSED_BA).
* @amsdu_in_ampdu_allowed: true if A-MSDU in A-MPDU is allowed.
* @state: state of the BA agreement establishment / tear down.
* @txq_id: Tx queue used by the BA session / DQA
* @ssn: the first packet to be sent in AGG HW queue in Tx AGG start flow, or
* the first packet to be sent in legacy HW queue in Tx AGG stop flow.
* Basically when next_reclaimed reaches ssn, we can tell mac80211 that
* we are ready to finish the Tx AGG stop / start flow.
* @tx_time: medium time consumed by this A-MPDU
* @is_tid_active: has this TID sent traffic in the last
* %IWL_MVM_DQA_QUEUE_TIMEOUT time period. If %txq_id is invalid, this
* field should be ignored.
*/
struct iwl_mvm_tid_data {
struct sk_buff_head deferred_tx_frames;
u16 seq_number;
u16 next_reclaimed;
/* The rest is Tx AGG related */
u32 rate_n_flags;
bool amsdu_in_ampdu_allowed;
enum iwl_mvm_agg_state state;
u16 txq_id;
u16 ssn;
u16 tx_time;
bool is_tid_active;
};
static inline u16 iwl_mvm_tid_queued(struct iwl_mvm_tid_data *tid_data)
{
return ieee80211_sn_sub(IEEE80211_SEQ_TO_SN(tid_data->seq_number),
tid_data->next_reclaimed);
}
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struct iwl_mvm_key_pn {
struct rcu_head rcu_head;
struct {
u8 pn[IWL_MAX_TID_COUNT][IEEE80211_CCMP_PN_LEN];
}
____cacheline_aligned_in_smp q[];
};
struct iwl_mvm_delba_data {
u32 baid;
}
__packed;
struct iwl_mvm_delba_notif {
struct iwl_mvm_internal_rxq_notif metadata;
struct iwl_mvm_delba_data delba;
}
__packed;
/**
* struct iwl_mvm_rxq_dup_data - per station per rx queue data
* @last_seq: last sequence per tid for duplicate packet detection
* @last_sub_frame: last subframe packet
*/
struct iwl_mvm_rxq_dup_data {
__le16 last_seq[IWL_MAX_TID_COUNT + 1];
u8 last_sub_frame[IWL_MAX_TID_COUNT + 1];
}
____cacheline_aligned_in_smp;
/**
* struct iwl_mvm_sta - representation of a station in the driver
* @sta_id: the index of the station in the fw (will be replaced by id_n_color)
* @tfd_queue_msk: the tfd queues used by the station
* @hw_queue: per-AC mapping of the TFD queues used by station
* @mac_id_n_color: the MAC context this station is linked to
* @tid_disable_agg: bitmap: if bit(tid) is set, the fw won't send ampdus for
* tid.
* @max_agg_bufsize: the maximal size of the AGG buffer for this station
* @bt_reduced_txpower: is reduced tx power enabled for this station
* @next_status_eosp: the next reclaimed packet is a PS-Poll response and
* we need to signal the EOSP
* @lock: lock to protect the whole struct. Since %tid_data is access from Tx
* and from Tx response flow, it needs a spinlock.
* @tid_data: per tid data + mgmt. Look at %iwl_mvm_tid_data.
* @tid_to_baid: a simple map of TID to baid
* @reserved_queue: the queue reserved for this STA for DQA purposes
* Every STA has is given one reserved queue to allow it to operate. If no
* such queue can be guaranteed, the STA addition will fail.
* @tx_protection: reference counter for controlling the Tx protection.
* @tt_tx_protection: is thermal throttling enable Tx protection?
* @disable_tx: is tx to this STA disabled?
* @tlc_amsdu: true if A-MSDU is allowed
* @agg_tids: bitmap of tids whose status is operational aggregated (IWL_AGG_ON)
* @sleep_tx_count: the number of frames that we told the firmware to let out
* even when that station is asleep. This is useful in case the queue
* gets empty before all the frames were sent, which can happen when
* we are sending frames from an AMPDU queue and there was a hole in
* the BA window. To be used for UAPSD only.
* @ptk_pn: per-queue PTK PN data structures
* @dup_data: per queue duplicate packet detection data
* @deferred_traffic_tid_map: indication bitmap of deferred traffic per-TID
*
* When mac80211 creates a station it reserves some space (hw->sta_data_size)
* in the structure for use by driver. This structure is placed in that
* space.
*
*/
struct iwl_mvm_sta {
u32 sta_id;
u32 tfd_queue_msk;
u8 hw_queue[IEEE80211_NUM_ACS];
u32 mac_id_n_color;
u16 tid_disable_agg;
u8 max_agg_bufsize;
bool bt_reduced_txpower;
bool next_status_eosp;
spinlock_t lock;
struct iwl_mvm_tid_data tid_data[IWL_MAX_TID_COUNT + 1];
u8 tid_to_baid[IWL_MAX_TID_COUNT];
struct iwl_lq_sta lq_sta;
struct ieee80211_vif *vif;
struct iwl_mvm_key_pn __rcu *ptk_pn[4];
struct iwl_mvm_rxq_dup_data *dup_data;
u16 deferred_traffic_tid_map;
u8 reserved_queue;
/* Temporary, until the new TLC will control the Tx protection */
s8 tx_protection;
bool tt_tx_protection;
bool disable_tx;
bool tlc_amsdu;
bool sleeping;
bool associated;
u8 agg_tids;
u8 sleep_tx_count;
u8 avg_energy;
};
static inline struct iwl_mvm_sta *
iwl_mvm_sta_from_mac80211(struct ieee80211_sta *sta)
{
return (void *)sta->drv_priv;
}
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/**
* struct iwl_mvm_int_sta - representation of an internal station (auxiliary or
* broadcast)
* @sta_id: the index of the station in the fw (will be replaced by id_n_color)
* @tfd_queue_msk: the tfd queues used by the station
*/
struct iwl_mvm_int_sta {
u32 sta_id;
u32 tfd_queue_msk;
};
/**
* Send the STA info to the FW.
*
* @mvm: the iwl_mvm* to use
* @sta: the STA
* @update: this is true if the FW is being updated about a STA it already knows
* about. Otherwise (if this is a new STA), this should be false.
* @flags: if update==true, this marks what is being changed via ORs of values
* from enum iwl_sta_modify_flag. Otherwise, this is ignored.
*/
int iwl_mvm_sta_send_to_fw(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
bool update, unsigned int flags);
int iwl_mvm_add_sta(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
struct ieee80211_sta *sta);
static inline int iwl_mvm_update_sta(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
struct ieee80211_sta *sta)
{
return iwl_mvm_sta_send_to_fw(mvm, sta, true, 0);
}
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int iwl_mvm_rm_sta(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
struct ieee80211_sta *sta);
int iwl_mvm_rm_sta_id(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
u8 sta_id);
int iwl_mvm_set_sta_key(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
struct ieee80211_sta *sta,
struct ieee80211_key_conf *keyconf,
u8 key_offset);
int iwl_mvm_remove_sta_key(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
struct ieee80211_sta *sta,
struct ieee80211_key_conf *keyconf);
void iwl_mvm_update_tkip_key(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
struct ieee80211_key_conf *keyconf,
struct ieee80211_sta *sta, u32 iv32,
u16 *phase1key);
void iwl_mvm_rx_eosp_notif(struct iwl_mvm *mvm,
struct iwl_rx_cmd_buffer *rxb);
/* AMPDU */
int iwl_mvm_sta_rx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
int tid, u16 ssn, bool start, u8 buf_size, u16 timeout);
int iwl_mvm_sta_tx_agg_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
struct ieee80211_sta *sta, u16 tid, u16 *ssn);
int iwl_mvm_sta_tx_agg_oper(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
struct ieee80211_sta *sta, u16 tid, u8 buf_size,
bool amsdu);
int iwl_mvm_sta_tx_agg_stop(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
struct ieee80211_sta *sta, u16 tid);
int iwl_mvm_sta_tx_agg_flush(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
struct ieee80211_sta *sta, u16 tid);
int iwl_mvm_sta_tx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
int tid, u8 queue, bool start);
int iwl_mvm_add_aux_sta(struct iwl_mvm *mvm);
void iwl_mvm_del_aux_sta(struct iwl_mvm *mvm);
int iwl_mvm_alloc_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
int iwl_mvm_send_add_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
int iwl_mvm_add_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
int iwl_mvm_send_rm_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
int iwl_mvm_rm_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
int iwl_mvm_allocate_int_sta(struct iwl_mvm *mvm,
struct iwl_mvm_int_sta *sta,
u32 qmask, enum nl80211_iftype iftype);
void iwl_mvm_dealloc_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
int iwl_mvm_add_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
int iwl_mvm_rm_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
void iwl_mvm_dealloc_snif_sta(struct iwl_mvm *mvm);
void iwl_mvm_sta_drained_wk(struct work_struct *wk);
void iwl_mvm_sta_modify_ps_wake(struct iwl_mvm *mvm,
struct ieee80211_sta *sta);
void iwl_mvm_sta_modify_sleep_tx_count(struct iwl_mvm *mvm,
struct ieee80211_sta *sta,
enum ieee80211_frame_release_type reason,
u16 cnt, u16 tids, bool more_data,
bool single_sta_queue);
int iwl_mvm_drain_sta(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
bool drain);
void iwl_mvm_sta_modify_disable_tx(struct iwl_mvm *mvm,
struct iwl_mvm_sta *mvmsta, bool disable);
void iwl_mvm_sta_modify_disable_tx_ap(struct iwl_mvm *mvm,
struct ieee80211_sta *sta,
bool disable);
void iwl_mvm_modify_all_sta_disable_tx(struct iwl_mvm *mvm,
struct iwl_mvm_vif *mvmvif,
bool disable);
void iwl_mvm_csa_client_absent(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
void iwl_mvm_add_new_dqa_stream_wk(struct work_struct *wk);
int iwl_mvm_scd_queue_redirect(struct iwl_mvm *mvm, int queue, int tid,
int ac, int ssn, unsigned int wdg_timeout,
bool force);
#endif /* __sta_h__ */
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| Person | Tokens | Prop | Commits | CommitProp |
| Johannes Berg | 690 | 66.93% | 12 | 33.33% |
| Liad Kaufman | 83 | 8.05% | 3 | 8.33% |
| Sara Sharon | 70 | 6.79% | 7 | 19.44% |
| Chaya Rachel Ivgy | 58 | 5.63% | 1 | 2.78% |
| Andrei Otcheretianski | 57 | 5.53% | 2 | 5.56% |
| Emmanuel Grumbach | 40 | 3.88% | 6 | 16.67% |
| Luciano Coelho | 17 | 1.65% | 2 | 5.56% |
| Eytan Lifshitz | 7 | 0.68% | 1 | 2.78% |
| Arik Nemtsov | 6 | 0.58% | 1 | 2.78% |
| Eyal Shapira | 3 | 0.29% | 1 | 2.78% |
| Total | 1031 | 100.00% | 36 | 100.00% |
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