[PATCH v5 02/10] ath10k: htc: rx trailer lookahead support
Kalle Valo
kvalo at qca.qualcomm.com
Wed Mar 15 07:46:40 PDT 2017
From: Erik Stromdahl <erik.stromdahl at gmail.com>
The RX trailer parsing is now capable of parsing lookahead reports.
A lookahead contains the first 4 bytes of the next HTC message
(that will be read in the next SDIO read operation).
Lookaheads are used by the SDIO/mbox HIF layer to determine if
the next message is part of a bundle, which endpoint it belongs
to and how long it is.
Signed-off-by: Erik Stromdahl <erik.stromdahl at gmail.com>
Signed-off-by: Kalle Valo <kvalo at qca.qualcomm.com>
---
drivers/net/wireless/ath/ath10k/htc.c | 95 ++++++++++++++++++++++++++++++++-
drivers/net/wireless/ath/ath10k/htc.h | 30 +++++++++-
2 files changed, 120 insertions(+), 5 deletions(-)
diff --git a/drivers/net/wireless/ath/ath10k/htc.c b/drivers/net/wireless/ath/ath10k/htc.c
index 35e67c46e027..fd5be4484984 100644
--- a/drivers/net/wireless/ath/ath10k/htc.c
+++ b/drivers/net/wireless/ath/ath10k/htc.c
@@ -228,11 +228,78 @@ ath10k_htc_process_credit_report(struct ath10k_htc *htc,
spin_unlock_bh(&htc->tx_lock);
}
+static int
+ath10k_htc_process_lookahead(struct ath10k_htc *htc,
+ const struct ath10k_htc_lookahead_report *report,
+ int len,
+ enum ath10k_htc_ep_id eid,
+ void *next_lookaheads,
+ int *next_lookaheads_len)
+{
+ struct ath10k *ar = htc->ar;
+
+ /* Invalid lookahead flags are actually transmitted by
+ * the target in the HTC control message.
+ * Since this will happen at every boot we silently ignore
+ * the lookahead in this case
+ */
+ if (report->pre_valid != ((~report->post_valid) & 0xFF))
+ return 0;
+
+ if (next_lookaheads && next_lookaheads_len) {
+ ath10k_dbg(ar, ATH10K_DBG_HTC,
+ "htc rx lookahead found pre_valid 0x%x post_valid 0x%x\n",
+ report->pre_valid, report->post_valid);
+
+ /* look ahead bytes are valid, copy them over */
+ memcpy((u8 *)next_lookaheads, report->lookahead, 4);
+
+ *next_lookaheads_len = 1;
+ }
+
+ return 0;
+}
+
+static int
+ath10k_htc_process_lookahead_bundle(struct ath10k_htc *htc,
+ const struct ath10k_htc_lookahead_bundle *report,
+ int len,
+ enum ath10k_htc_ep_id eid,
+ void *next_lookaheads,
+ int *next_lookaheads_len)
+{
+ struct ath10k *ar = htc->ar;
+ int bundle_cnt = len / sizeof(*report);
+
+ if (!bundle_cnt || (bundle_cnt > HTC_HOST_MAX_MSG_PER_BUNDLE)) {
+ ath10k_warn(ar, "Invalid lookahead bundle count: %d\n",
+ bundle_cnt);
+ return -EINVAL;
+ }
+
+ if (next_lookaheads && next_lookaheads_len) {
+ int i;
+
+ for (i = 0; i < bundle_cnt; i++) {
+ memcpy(((u8 *)next_lookaheads) + 4 * i,
+ report->lookahead, 4);
+ report++;
+ }
+
+ *next_lookaheads_len = bundle_cnt;
+ }
+
+ return 0;
+}
+
int ath10k_htc_process_trailer(struct ath10k_htc *htc,
u8 *buffer,
int length,
- enum ath10k_htc_ep_id src_eid)
+ enum ath10k_htc_ep_id src_eid,
+ void *next_lookaheads,
+ int *next_lookaheads_len)
{
+ struct ath10k_htc_lookahead_bundle *bundle;
struct ath10k *ar = htc->ar;
int status = 0;
struct ath10k_htc_record *record;
@@ -272,6 +339,29 @@ int ath10k_htc_process_trailer(struct ath10k_htc *htc,
record->hdr.len,
src_eid);
break;
+ case ATH10K_HTC_RECORD_LOOKAHEAD:
+ len = sizeof(struct ath10k_htc_lookahead_report);
+ if (record->hdr.len < len) {
+ ath10k_warn(ar, "Lookahead report too long\n");
+ status = -EINVAL;
+ break;
+ }
+ status = ath10k_htc_process_lookahead(htc,
+ record->lookahead_report,
+ record->hdr.len,
+ src_eid,
+ next_lookaheads,
+ next_lookaheads_len);
+ break;
+ case ATH10K_HTC_RECORD_LOOKAHEAD_BUNDLE:
+ bundle = record->lookahead_bundle;
+ status = ath10k_htc_process_lookahead_bundle(htc,
+ bundle,
+ record->hdr.len,
+ src_eid,
+ next_lookaheads,
+ next_lookaheads_len);
+ break;
default:
ath10k_warn(ar, "Unhandled record: id:%d length:%d\n",
record->hdr.id, record->hdr.len);
@@ -359,7 +449,8 @@ void ath10k_htc_rx_completion_handler(struct ath10k *ar, struct sk_buff *skb)
trailer += payload_len;
trailer -= trailer_len;
status = ath10k_htc_process_trailer(htc, trailer,
- trailer_len, hdr->eid);
+ trailer_len, hdr->eid,
+ NULL, NULL);
if (status)
goto out;
diff --git a/drivers/net/wireless/ath/ath10k/htc.h b/drivers/net/wireless/ath/ath10k/htc.h
index f728ce7124cf..ae6003495649 100644
--- a/drivers/net/wireless/ath/ath10k/htc.h
+++ b/drivers/net/wireless/ath/ath10k/htc.h
@@ -50,6 +50,8 @@ struct ath10k;
* 4-byte aligned.
*/
+#define HTC_HOST_MAX_MSG_PER_BUNDLE 8
+
enum ath10k_htc_tx_flags {
ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE = 0x01,
ATH10K_HTC_FLAG_SEND_BUNDLE = 0x02
@@ -174,8 +176,10 @@ struct ath10k_htc_msg {
} __packed __aligned(4);
enum ath10k_ath10k_htc_record_id {
- ATH10K_HTC_RECORD_NULL = 0,
- ATH10K_HTC_RECORD_CREDITS = 1
+ ATH10K_HTC_RECORD_NULL = 0,
+ ATH10K_HTC_RECORD_CREDITS = 1,
+ ATH10K_HTC_RECORD_LOOKAHEAD = 2,
+ ATH10K_HTC_RECORD_LOOKAHEAD_BUNDLE = 3,
};
struct ath10k_ath10k_htc_record_hdr {
@@ -192,10 +196,28 @@ struct ath10k_htc_credit_report {
u8 pad1;
} __packed;
+struct ath10k_htc_lookahead_report {
+ u8 pre_valid;
+ u8 pad0;
+ u8 pad1;
+ u8 pad2;
+ u8 lookahead[4];
+ u8 post_valid;
+ u8 pad3;
+ u8 pad4;
+ u8 pad5;
+} __packed;
+
+struct ath10k_htc_lookahead_bundle {
+ u8 lookahead[4];
+} __packed;
+
struct ath10k_htc_record {
struct ath10k_ath10k_htc_record_hdr hdr;
union {
struct ath10k_htc_credit_report credit_report[0];
+ struct ath10k_htc_lookahead_report lookahead_report[0];
+ struct ath10k_htc_lookahead_bundle lookahead_bundle[0];
u8 pauload[0];
};
} __packed __aligned(4);
@@ -356,6 +378,8 @@ void ath10k_htc_notify_tx_completion(struct ath10k_htc_ep *ep,
int ath10k_htc_process_trailer(struct ath10k_htc *htc,
u8 *buffer,
int length,
- enum ath10k_htc_ep_id src_eid);
+ enum ath10k_htc_ep_id src_eid,
+ void *next_lookaheads,
+ int *next_lookaheads_len);
#endif
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