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lede/package/kernel/mac80211/patches/ath11k/0083-ath11k-add-branch-predictors-in-dp_tx-path.patch
lean 66d19a4e36 mac80211: bump to 5.15.33-1
2022-07-08 12:44:37 +08:00

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From bcef57ea400cc20a5389fa0e38d61063331558f8 Mon Sep 17 00:00:00 2001
From: P Praneesh <ppranees@codeaurora.org>
Date: Fri, 12 Nov 2021 11:06:04 +0200
Subject: [PATCH] ath11k: add branch predictors in dp_tx path
Add branch prediction in dp_tx code path in tx and tx completion handlers.
Also in ath11k_dp_tx_complete_msdu , the pointer that is returned by
rcu_dereference() is not dereferenced. so it is preferable to use
rcu_access_pointer() here.
Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.4.0.1-01734-QCAHKSWPL_SILICONZ-1 v2
Co-developed-by: Sriram R <srirrama@codeaurora.org>
Signed-off-by: Sriram R <srirrama@codeaurora.org>
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
Signed-off-by: P Praneesh <ppranees@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1630560820-21905-12-git-send-email-ppranees@codeaurora.org
---
drivers/net/wireless/ath/ath11k/dp_tx.c | 52 ++++++++++++-------------
drivers/net/wireless/ath/ath11k/mac.c | 2 +-
2 files changed, 25 insertions(+), 29 deletions(-)
--- a/drivers/net/wireless/ath/ath11k/dp_tx.c
+++ b/drivers/net/wireless/ath/ath11k/dp_tx.c
@@ -95,11 +95,11 @@ int ath11k_dp_tx(struct ath11k *ar, stru
u8 ring_selector = 0, ring_map = 0;
bool tcl_ring_retry;
- if (test_bit(ATH11K_FLAG_CRASH_FLUSH, &ar->ab->dev_flags))
+ if (unlikely(test_bit(ATH11K_FLAG_CRASH_FLUSH, &ar->ab->dev_flags)))
return -ESHUTDOWN;
- if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
- !ieee80211_is_data(hdr->frame_control))
+ if (unlikely(!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
+ !ieee80211_is_data(hdr->frame_control)))
return -ENOTSUPP;
pool_id = skb_get_queue_mapping(skb) & (ATH11K_HW_MAX_QUEUES - 1);
@@ -127,7 +127,7 @@ tcl_ring_sel:
DP_TX_IDR_SIZE - 1, GFP_ATOMIC);
spin_unlock_bh(&tx_ring->tx_idr_lock);
- if (ret < 0) {
+ if (unlikely(ret < 0)) {
if (ring_map == (BIT(ab->hw_params.max_tx_ring) - 1)) {
atomic_inc(&ab->soc_stats.tx_err.misc_fail);
return -ENOSPC;
@@ -152,7 +152,7 @@ tcl_ring_sel:
ti.meta_data_flags = arvif->tcl_metadata;
}
- if (ti.encap_type == HAL_TCL_ENCAP_TYPE_RAW) {
+ if (unlikely(ti.encap_type == HAL_TCL_ENCAP_TYPE_RAW)) {
if (skb_cb->flags & ATH11K_SKB_CIPHER_SET) {
ti.encrypt_type =
ath11k_dp_tx_get_encrypt_type(skb_cb->cipher);
@@ -173,8 +173,8 @@ tcl_ring_sel:
ti.bss_ast_idx = arvif->ast_idx;
ti.dscp_tid_tbl_idx = 0;
- if (skb->ip_summed == CHECKSUM_PARTIAL &&
- ti.encap_type != HAL_TCL_ENCAP_TYPE_RAW) {
+ if (likely(skb->ip_summed == CHECKSUM_PARTIAL &&
+ ti.encap_type != HAL_TCL_ENCAP_TYPE_RAW)) {
ti.flags0 |= FIELD_PREP(HAL_TCL_DATA_CMD_INFO1_IP4_CKSUM_EN, 1) |
FIELD_PREP(HAL_TCL_DATA_CMD_INFO1_UDP4_CKSUM_EN, 1) |
FIELD_PREP(HAL_TCL_DATA_CMD_INFO1_UDP6_CKSUM_EN, 1) |
@@ -211,7 +211,7 @@ tcl_ring_sel:
}
ti.paddr = dma_map_single(ab->dev, skb->data, skb->len, DMA_TO_DEVICE);
- if (dma_mapping_error(ab->dev, ti.paddr)) {
+ if (unlikely(dma_mapping_error(ab->dev, ti.paddr))) {
atomic_inc(&ab->soc_stats.tx_err.misc_fail);
ath11k_warn(ab, "failed to DMA map data Tx buffer\n");
ret = -ENOMEM;
@@ -231,7 +231,7 @@ tcl_ring_sel:
ath11k_hal_srng_access_begin(ab, tcl_ring);
hal_tcl_desc = (void *)ath11k_hal_srng_src_get_next_entry(ab, tcl_ring);
- if (!hal_tcl_desc) {
+ if (unlikely(!hal_tcl_desc)) {
/* NOTE: It is highly unlikely we'll be running out of tcl_ring
* desc because the desc is directly enqueued onto hw queue.
*/
@@ -245,7 +245,7 @@ tcl_ring_sel:
* checking this ring earlier for each pkt tx.
* Restart ring selection if some rings are not checked yet.
*/
- if (ring_map != (BIT(ab->hw_params.max_tx_ring) - 1) &&
+ if (unlikely(ring_map != (BIT(ab->hw_params.max_tx_ring)) - 1) &&
ab->hw_params.max_tx_ring > 1) {
tcl_ring_retry = true;
ring_selector++;
@@ -327,7 +327,7 @@ ath11k_dp_tx_htt_tx_complete_buf(struct
spin_lock_bh(&tx_ring->tx_idr_lock);
msdu = idr_find(&tx_ring->txbuf_idr, ts->msdu_id);
- if (!msdu) {
+ if (unlikely(!msdu)) {
ath11k_warn(ab, "htt tx completion for unknown msdu_id %d\n",
ts->msdu_id);
spin_unlock_bh(&tx_ring->tx_idr_lock);
@@ -435,16 +435,14 @@ static void ath11k_dp_tx_complete_msdu(s
dma_unmap_single(ab->dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);
- rcu_read_lock();
-
- if (!rcu_dereference(ab->pdevs_active[ar->pdev_idx])) {
+ if (unlikely(!rcu_access_pointer(ab->pdevs_active[ar->pdev_idx]))) {
dev_kfree_skb_any(msdu);
- goto exit;
+ return;
}
- if (!skb_cb->vif) {
+ if (unlikely(!skb_cb->vif)) {
dev_kfree_skb_any(msdu);
- goto exit;
+ return;
}
info = IEEE80211_SKB_CB(msdu);
@@ -465,7 +463,7 @@ static void ath11k_dp_tx_complete_msdu(s
(info->flags & IEEE80211_TX_CTL_NO_ACK))
info->flags |= IEEE80211_TX_STAT_NOACK_TRANSMITTED;
- if (ath11k_debugfs_is_extd_tx_stats_enabled(ar)) {
+ if (unlikely(ath11k_debugfs_is_extd_tx_stats_enabled(ar))) {
if (ts->flags & HAL_TX_STATUS_FLAGS_FIRST_MSDU) {
if (ar->last_ppdu_id == 0) {
ar->last_ppdu_id = ts->ppdu_id;
@@ -494,9 +492,6 @@ static void ath11k_dp_tx_complete_msdu(s
*/
ieee80211_tx_status(ar->hw, msdu);
-
-exit:
- rcu_read_unlock();
}
static inline void ath11k_dp_tx_status_parse(struct ath11k_base *ab,
@@ -505,11 +500,11 @@ static inline void ath11k_dp_tx_status_p
{
ts->buf_rel_source =
FIELD_GET(HAL_WBM_RELEASE_INFO0_REL_SRC_MODULE, desc->info0);
- if (ts->buf_rel_source != HAL_WBM_REL_SRC_MODULE_FW &&
- ts->buf_rel_source != HAL_WBM_REL_SRC_MODULE_TQM)
+ if (unlikely(ts->buf_rel_source != HAL_WBM_REL_SRC_MODULE_FW &&
+ ts->buf_rel_source != HAL_WBM_REL_SRC_MODULE_TQM))
return;
- if (ts->buf_rel_source == HAL_WBM_REL_SRC_MODULE_FW)
+ if (unlikely(ts->buf_rel_source == HAL_WBM_REL_SRC_MODULE_FW))
return;
ts->status = FIELD_GET(HAL_WBM_RELEASE_INFO0_TQM_RELEASE_REASON,
@@ -556,8 +551,9 @@ void ath11k_dp_tx_completion_handler(str
ATH11K_TX_COMPL_NEXT(tx_ring->tx_status_head);
}
- if ((ath11k_hal_srng_dst_peek(ab, status_ring) != NULL) &&
- (ATH11K_TX_COMPL_NEXT(tx_ring->tx_status_head) == tx_ring->tx_status_tail)) {
+ if (unlikely((ath11k_hal_srng_dst_peek(ab, status_ring) != NULL) &&
+ (ATH11K_TX_COMPL_NEXT(tx_ring->tx_status_head) ==
+ tx_ring->tx_status_tail))) {
/* TODO: Process pending tx_status messages when kfifo_is_full() */
ath11k_warn(ab, "Unable to process some of the tx_status ring desc because status_fifo is full\n");
}
@@ -580,7 +576,7 @@ void ath11k_dp_tx_completion_handler(str
mac_id = FIELD_GET(DP_TX_DESC_ID_MAC_ID, desc_id);
msdu_id = FIELD_GET(DP_TX_DESC_ID_MSDU_ID, desc_id);
- if (ts.buf_rel_source == HAL_WBM_REL_SRC_MODULE_FW) {
+ if (unlikely(ts.buf_rel_source == HAL_WBM_REL_SRC_MODULE_FW)) {
ath11k_dp_tx_process_htt_tx_complete(ab,
(void *)tx_status,
mac_id, msdu_id,
@@ -590,7 +586,7 @@ void ath11k_dp_tx_completion_handler(str
spin_lock_bh(&tx_ring->tx_idr_lock);
msdu = idr_find(&tx_ring->txbuf_idr, msdu_id);
- if (!msdu) {
+ if (unlikely(!msdu)) {
ath11k_warn(ab, "tx completion for unknown msdu_id %d\n",
msdu_id);
spin_unlock_bh(&tx_ring->tx_idr_lock);
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -5293,7 +5293,7 @@ static void ath11k_mac_op_tx(struct ieee
arsta = (struct ath11k_sta *)control->sta->drv_priv;
ret = ath11k_dp_tx(ar, arvif, arsta, skb);
- if (ret) {
+ if (unlikely(ret)) {
ath11k_warn(ar->ab, "failed to transmit frame %d\n", ret);
ieee80211_free_txskb(ar->hw, skb);
}
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