ath10k: bypass htc for htt tx path

Going through full htc tx path for htt tx is a
waste of resources. By skipping it it's possible
to easily submit scatter-gather to the pci hif for
reduced host cpu load and improved performance.

The new approach uses dma pool to store the
following metadata for each tx request:
 * msdu fragment list
 * htc header
 * htt tx command

The htt tx command contains a msdu prefetch.
Instead of copying it original mapped msdu address
is used to submit a second scatter-gather item to
hif to make a complete htt tx command.

The htt tx command itself hands over dma mapped
pointers to msdus and completion of the command
itself doesn't mean the frame has been sent and
can be unmapped/freed. This is why htc tx
completion is skipped for htt tx as all tx related
resources are freed upon htt tx completion
indication event (which also implicitly means htt
tx command itself was completed).

Since now each htt tx request effectively consists
of 2 copy engine items CE_HTT_H2T_MSG_SRC_NENTRIES
is updated to allow maximum of
TARGET_10X_NUM_MSDU_DESC msdus being queued. This
keeps the tx path resource management simple.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

1 files changed, 3 insertions, 9 deletions

diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c
index 713c18e8a1a8..2305d583019b 100644
--- a/drivers/net/wireless/ath/ath10k/pci.c
+++ b/drivers/net/wireless/ath/ath10k/pci.c
@@ -714,6 +714,7 @@ static void ath10k_pci_ce_send_done(struct ath10k_ce_pipe *ce_state)
 	while (ath10k_ce_completed_send_next(ce_state, &transfer_context,
 					     &ce_data, &nbytes,
 					     &transfer_id) == 0) {
+		/* no need to call tx completion for NULL pointers */
 		if (transfer_context == NULL)
 			continue;
 
@@ -1423,16 +1424,9 @@ static void ath10k_pci_tx_pipe_cleanup(struct ath10k_pci_pipe *pipe_info)
 
 	while (ath10k_ce_cancel_send_next(ce_hdl, (void **)&netbuf,
 					  &ce_data, &nbytes, &id) == 0) {
-		/*
-		 * Indicate the completion to higer layer to free
-		 * the buffer
-		 */
-
-		if (!netbuf) {
-			ath10k_warn("invalid sk_buff on CE %d - NULL pointer. firmware crashed?\n",
-				    ce_hdl->id);
+		/* no need to call tx completion for NULL pointers */
+		if (!netbuf)
 			continue;
-		}
 
 		ar_pci->msg_callbacks_current.tx_completion(ar,
 							    netbuf,