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Date: Tue, 21 Jul 2020 22:44:21 +0530
From: Rakesh Pillai <pillair@...eaurora.org>
To: ath10k@...ts.infradead.org
Cc: linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
kvalo@...eaurora.org, johannes@...solutions.net,
davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
dianders@...omium.org, evgreen@...omium.org,
Rakesh Pillai <pillair@...eaurora.org>
Subject: [RFC 2/7] ath10k: Add support to process rx packet in thread
NAPI instance gets scheduled on a CPU core on which
the IRQ was triggered. The processing of rx packets
can be CPU intensive and since NAPI cannot be moved
to a different CPU core, to get better performance,
its better to move the gist of rx packet processing
in a high priority thread.
Add the init/deinit part for a thread to process the
receive packets.
Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.1-01040-QCAHLSWMTPLZ-1
Signed-off-by: Rakesh Pillai <pillair@...eaurora.org>
---
drivers/net/wireless/ath/ath10k/core.c | 33 +++++++++++++++++++++++++++
drivers/net/wireless/ath/ath10k/core.h | 23 +++++++++++++++++++
drivers/net/wireless/ath/ath10k/snoc.c | 41 ++++++++++++++++++++++++++++++++++
3 files changed, 97 insertions(+)
diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
index 9104496..2b520a0 100644
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -668,6 +668,39 @@ static unsigned int ath10k_core_get_fw_feature_str(char *buf,
return scnprintf(buf, buf_len, "%s", ath10k_core_fw_feature_str[feat]);
}
+int ath10k_core_thread_shutdown(struct ath10k *ar,
+ struct ath10k_thread *thread)
+{
+ ath10k_dbg(ar, ATH10K_DBG_BOOT, "shutting down %s\n", thread->name);
+ set_bit(ATH10K_THREAD_EVENT_SHUTDOWN, thread->event_flags);
+ wake_up_process(thread->task);
+ wait_for_completion(&thread->shutdown);
+ ath10k_info(ar, "thread %s exited\n", thread->name);
+
+ return 0;
+}
+EXPORT_SYMBOL(ath10k_core_thread_shutdown);
+
+int ath10k_core_thread_init(struct ath10k *ar,
+ struct ath10k_thread *thread,
+ int (*handler)(void *data),
+ char *thread_name)
+{
+ thread->task = kthread_create(handler, thread, thread_name);
+ if (IS_ERR(thread->task))
+ return -EINVAL;
+
+ init_waitqueue_head(&thread->wait_q);
+ init_completion(&thread->shutdown);
+ memcpy(thread->name, thread_name, ATH10K_THREAD_NAME_SIZE_MAX);
+ clear_bit(ATH10K_THREAD_EVENT_SHUTDOWN, thread->event_flags);
+ ath10k_info(ar, "Starting thread %s\n", thread_name);
+ wake_up_process(thread->task);
+
+ return 0;
+}
+EXPORT_SYMBOL(ath10k_core_thread_init);
+
void ath10k_core_get_fw_features_str(struct ath10k *ar,
char *buf,
size_t buf_len)
diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h
index 5c18f6c..96919e8 100644
--- a/drivers/net/wireless/ath/ath10k/core.h
+++ b/drivers/net/wireless/ath/ath10k/core.h
@@ -970,6 +970,22 @@ struct ath10k_bus_params {
bool hl_msdu_ids;
};
+#define ATH10K_THREAD_NAME_SIZE_MAX 32
+
+enum ath10k_thread_events {
+ ATH10K_THREAD_EVENT_SHUTDOWN,
+ ATH10K_THREAD_EVENT_MAX,
+};
+
+struct ath10k_thread {
+ struct ath10k *ar;
+ struct task_struct *task;
+ struct completion shutdown;
+ wait_queue_head_t wait_q;
+ DECLARE_BITMAP(event_flags, ATH10K_THREAD_EVENT_MAX);
+ char name[ATH10K_THREAD_NAME_SIZE_MAX];
+};
+
struct ath10k {
struct ath_common ath_common;
struct ieee80211_hw *hw;
@@ -982,6 +998,7 @@ struct ath10k {
} msa;
u8 mac_addr[ETH_ALEN];
+ struct ath10k_thread rx_thread;
enum ath10k_hw_rev hw_rev;
u16 dev_id;
u32 chip_id;
@@ -1276,6 +1293,12 @@ static inline bool ath10k_peer_stats_enabled(struct ath10k *ar)
extern unsigned long ath10k_coredump_mask;
+int ath10k_core_thread_shutdown(struct ath10k *ar,
+ struct ath10k_thread *thread);
+int ath10k_core_thread_init(struct ath10k *ar,
+ struct ath10k_thread *thread,
+ int (*handler)(void *data),
+ char *thread_name);
struct ath10k *ath10k_core_create(size_t priv_size, struct device *dev,
enum ath10k_bus bus,
enum ath10k_hw_rev hw_rev,
diff --git a/drivers/net/wireless/ath/ath10k/snoc.c b/drivers/net/wireless/ath/ath10k/snoc.c
index 1ef5fdb..463c34e 100644
--- a/drivers/net/wireless/ath/ath10k/snoc.c
+++ b/drivers/net/wireless/ath/ath10k/snoc.c
@@ -909,6 +909,31 @@ static void ath10k_snoc_buffer_cleanup(struct ath10k *ar)
}
}
+int ath10k_snoc_rx_thread_loop(void *data)
+{
+ struct ath10k_thread *rx_thread = data;
+ struct ath10k *ar = rx_thread->ar;
+ bool shutdown = false;
+
+ ath10k_dbg(ar, ATH10K_DBG_SNOC, "rx thread started\n");
+ set_user_nice(current, -1);
+
+ while (!shutdown) {
+ wait_event_interruptible(
+ rx_thread->wait_q,
+ (test_bit(ATH10K_THREAD_EVENT_SHUTDOWN,
+ rx_thread->event_flags)));
+ if (test_and_clear_bit(ATH10K_THREAD_EVENT_SHUTDOWN,
+ rx_thread->event_flags))
+ shutdown = true;
+ }
+
+ ath10k_dbg(ar, ATH10K_DBG_SNOC, "rx thread exiting\n");
+ complete(&rx_thread->shutdown);
+
+ do_exit(0);
+}
+
static void ath10k_snoc_hif_stop(struct ath10k *ar)
{
if (!test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags))
@@ -916,6 +941,7 @@ static void ath10k_snoc_hif_stop(struct ath10k *ar)
napi_synchronize(&ar->napi);
napi_disable(&ar->napi);
+ ath10k_core_thread_shutdown(ar, &ar->rx_thread);
ath10k_snoc_buffer_cleanup(ar);
ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot hif stop\n");
}
@@ -923,9 +949,19 @@ static void ath10k_snoc_hif_stop(struct ath10k *ar)
static int ath10k_snoc_hif_start(struct ath10k *ar)
{
struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
+ int ret;
bitmap_clear(ar_snoc->pending_ce_irqs, 0, CE_COUNT_MAX);
napi_enable(&ar->napi);
+
+ ret = ath10k_core_thread_init(ar, &ar->rx_thread,
+ ath10k_snoc_rx_thread_loop,
+ "ath10k_rx_thread");
+ if (ret) {
+ ath10k_err(ar, "failed to start rx thread\n");
+ goto rx_thread_fail;
+ }
+
ath10k_snoc_irq_enable(ar);
ath10k_snoc_rx_post(ar);
@@ -934,6 +970,10 @@ static int ath10k_snoc_hif_start(struct ath10k *ar)
ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot hif start\n");
return 0;
+
+rx_thread_fail:
+ napi_disable(&ar->napi);
+ return ret;
}
static int ath10k_snoc_init_pipes(struct ath10k *ar)
@@ -1652,6 +1692,7 @@ static int ath10k_snoc_probe(struct platform_device *pdev)
return -ENOMEM;
}
+ ar->rx_thread.ar = ar;
ar_snoc = ath10k_snoc_priv(ar);
ar_snoc->dev = pdev;
platform_set_drvdata(pdev, ar);
--
2.7.4
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