iwlwifi: mvm: add reorder buffer per queue

Next hardware will direct packets to core based on the TCP/UDP
streams.
This logic can create holes in reorder buffer since packets that
belong to other stream were directed to a different core.
However, those are valid holes and the packets can be indicated
in L3 order.

The hardware will utilize a mechanism of informing the driver of
the normalized ssn and the driver shall release all packets that
SN is lower than the nssn.
This enables managing the reorder across the queues without sharing
any data between them.

The reorder buffer is allocated and released directly in the RX path
in order to avoid various races between control path and rx path.
The code utilizes the internal messaging to notify rx queues of when
to delete the reorder buffer.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
index ea1817a09768..8272e54832b4 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
@@ -614,6 +614,28 @@ struct iwl_mvm_shared_mem_cfg {
 };
 
 /**
+ * struct iwl_mvm_reorder_buffer - per ra/tid/queue reorder buffer
+ * @head_sn: reorder window head sn
+ * @num_stored: number of mpdus stored in the buffer
+ * @buf_size: the reorder buffer size as set by the last addba request
+ * @sta_id: sta id of this reorder buffer
+ * @queue: queue of this reorder buffer
+ * @last_amsdu: track last ASMDU SN for duplication detection
+ * @last_sub_index: track ASMDU sub frame index for duplication detection
+ * @entries: list of skbs stored
+ */
+struct iwl_mvm_reorder_buffer {
+	u16 head_sn;
+	u16 num_stored;
+	u8 buf_size;
+	u8 sta_id;
+	int queue;
+	u16 last_amsdu;
+	u8 last_sub_index;
+	struct sk_buff_head entries[IEEE80211_MAX_AMPDU_BUF];
+} ____cacheline_aligned_in_smp;
+
+/**
  * struct iwl_mvm_baid_data - BA session data
  * @sta_id: station id
  * @tid: tid of the session
@@ -622,6 +644,7 @@ struct iwl_mvm_shared_mem_cfg {
  * @last_rx: last rx jiffies, updated only if timeout passed from last update
  * @session_timer: timer to check if BA session expired, runs at 2 * timeout
  * @mvm: mvm pointer, needed for timer context
+ * @reorder_buf: reorder buffer, allocated per queue
  */
 struct iwl_mvm_baid_data {
 	struct rcu_head rcu_head;
@@ -632,6 +655,7 @@ struct iwl_mvm_baid_data {
 	unsigned long last_rx;
 	struct timer_list session_timer;
 	struct iwl_mvm *mvm;
+	struct iwl_mvm_reorder_buffer reorder_buf[];
 };
 
 struct iwl_mvm {