7 files changed, 80 insertions, 99 deletions

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index 9cfe84319ee4..5b446d2a07c8 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -823,7 +823,7 @@ static void gsi_channel_program(struct gsi_channel *channel, bool doorbell)
 
 	/* Now update the scratch registers for GPI protocol */
 	gpi = &scr.gpi;
-	gpi->max_outstanding_tre = gsi_channel_trans_tre_max(gsi, channel_id) *
+	gpi->max_outstanding_tre = channel->trans_tre_max *
 					GSI_RING_ELEMENT_SIZE;
 	gpi->outstanding_threshold = 2 * GSI_RING_ELEMENT_SIZE;
 
@@ -991,36 +991,22 @@ void gsi_resume(struct gsi *gsi)
 	enable_irq(gsi->irq);
 }
 
-/**
- * gsi_channel_tx_queued() - Report queued TX transfers for a channel
- * @channel:	Channel for which to report
- *
- * Report to the network stack the number of bytes and transactions that
- * have been queued to hardware since last call.  This and the next function
- * supply information used by the network stack for throttling.
- *
- * For each channel we track the number of transactions used and bytes of
- * data those transactions represent.  We also track what those values are
- * each time this function is called.  Subtracting the two tells us
- * the number of bytes and transactions that have been added between
- * successive calls.
- *
- * Calling this each time we ring the channel doorbell allows us to
- * provide accurate information to the network stack about how much
- * work we've given the hardware at any point in time.
- */
-void gsi_channel_tx_queued(struct gsi_channel *channel)
+void gsi_trans_tx_queued(struct gsi_trans *trans)
 {
+	u32 channel_id = trans->channel_id;
+	struct gsi *gsi = trans->gsi;
+	struct gsi_channel *channel;
 	u32 trans_count;
 	u32 byte_count;
 
+	channel = &gsi->channel[channel_id];
+
 	byte_count = channel->byte_count - channel->queued_byte_count;
 	trans_count = channel->trans_count - channel->queued_trans_count;
 	channel->queued_byte_count = channel->byte_count;
 	channel->queued_trans_count = channel->trans_count;
 
-	ipa_gsi_channel_tx_queued(channel->gsi, gsi_channel_id(channel),
-				  trans_count, byte_count);
+	ipa_gsi_channel_tx_queued(gsi, channel_id, trans_count, byte_count);
 }
 
 /**
@@ -1327,17 +1313,29 @@ static int gsi_irq_init(struct gsi *gsi, struct platform_device *pdev)
 }
 
 /* Return the transaction associated with a transfer completion event */
-static struct gsi_trans *gsi_event_trans(struct gsi_channel *channel,
-					 struct gsi_event *event)
+static struct gsi_trans *
+gsi_event_trans(struct gsi *gsi, struct gsi_event *event)
 {
+	u32 channel_id = event->chid;
+	struct gsi_channel *channel;
+	struct gsi_trans *trans;
 	u32 tre_offset;
 	u32 tre_index;
 
+	channel = &gsi->channel[channel_id];
+	if (WARN(!channel->gsi, "event has bad channel %u\n", channel_id))
+		return NULL;
+
 	/* Event xfer_ptr records the TRE it's associated with */
 	tre_offset = lower_32_bits(le64_to_cpu(event->xfer_ptr));
 	tre_index = gsi_ring_index(&channel->tre_ring, tre_offset);
 
-	return gsi_channel_trans_mapped(channel, tre_index);
+	trans = gsi_channel_trans_mapped(channel, tre_index);
+
+	if (WARN(!trans, "channel %u event with no transaction\n", channel_id))
+		return NULL;
+
+	return trans;
 }
 
 /**
@@ -1381,7 +1379,9 @@ static void gsi_evt_ring_rx_update(struct gsi_evt_ring *evt_ring, u32 index)
 	 */
 	old_index = ring->index;
 	event = gsi_ring_virt(ring, old_index);
-	trans = gsi_event_trans(channel, event);
+	trans = gsi_event_trans(channel->gsi, event);
+	if (!trans)
+		return;
 
 	/* Compute the number of events to process before we wrap,
 	 * and determine when we'll be done processing events.
@@ -1493,7 +1493,9 @@ static struct gsi_trans *gsi_channel_update(struct gsi_channel *channel)
 		return NULL;
 
 	/* Get the transaction for the latest completed event. */
-	trans = gsi_event_trans(channel, gsi_ring_virt(ring, index - 1));
+	trans = gsi_event_trans(gsi, gsi_ring_virt(ring, index - 1));
+	if (!trans)
+		return NULL;
 
 	/* For RX channels, update each completed transaction with the number
 	 * of bytes that were actually received.  For TX channels, report
@@ -2001,9 +2003,10 @@ static void gsi_channel_evt_ring_exit(struct gsi_channel *channel)
 	gsi_evt_ring_id_free(gsi, evt_ring_id);
 }
 
-static bool gsi_channel_data_valid(struct gsi *gsi,
+static bool gsi_channel_data_valid(struct gsi *gsi, bool command,
 				   const struct ipa_gsi_endpoint_data *data)
 {
+	const struct gsi_channel_data *channel_data;
 	u32 channel_id = data->channel_id;
 	struct device *dev = gsi->dev;
 
@@ -2019,10 +2022,24 @@ static bool gsi_channel_data_valid(struct gsi *gsi,
 		return false;
 	}
 
-	if (!data->channel.tlv_count ||
-	    data->channel.tlv_count > GSI_TLV_MAX) {
+	if (command && !data->toward_ipa) {
+		dev_err(dev, "command channel %u is not TX\n", channel_id);
+		return false;
+	}
+
+	channel_data = &data->channel;
+
+	if (!channel_data->tlv_count ||
+	    channel_data->tlv_count > GSI_TLV_MAX) {
 		dev_err(dev, "channel %u bad tlv_count %u; must be 1..%u\n",
-			channel_id, data->channel.tlv_count, GSI_TLV_MAX);
+			channel_id, channel_data->tlv_count, GSI_TLV_MAX);
+		return false;
+	}
+
+	if (command && IPA_COMMAND_TRANS_TRE_MAX > channel_data->tlv_count) {
+		dev_err(dev, "command TRE max too big for channel %u (%u > %u)\n",
+			channel_id, IPA_COMMAND_TRANS_TRE_MAX,
+			channel_data->tlv_count);
 		return false;
 	}
 
@@ -2031,22 +2048,22 @@ static bool gsi_channel_data_valid(struct gsi *gsi,
 	 * gsi_channel_tre_max() is computed, tre_count has to be almost
 	 * twice the TLV FIFO size to satisfy this requirement.
 	 */
-	if (data->channel.tre_count < 2 * data->channel.tlv_count - 1) {
+	if (channel_data->tre_count < 2 * channel_data->tlv_count - 1) {
 		dev_err(dev, "channel %u TLV count %u exceeds TRE count %u\n",
-			channel_id, data->channel.tlv_count,
-			data->channel.tre_count);
+			channel_id, channel_data->tlv_count,
+			channel_data->tre_count);
 		return false;
 	}
 
-	if (!is_power_of_2(data->channel.tre_count)) {
+	if (!is_power_of_2(channel_data->tre_count)) {
 		dev_err(dev, "channel %u bad tre_count %u; not power of 2\n",
-			channel_id, data->channel.tre_count);
+			channel_id, channel_data->tre_count);
 		return false;
 	}
 
-	if (!is_power_of_2(data->channel.event_count)) {
+	if (!is_power_of_2(channel_data->event_count)) {
 		dev_err(dev, "channel %u bad event_count %u; not power of 2\n",
-			channel_id, data->channel.event_count);
+			channel_id, channel_data->event_count);
 		return false;
 	}
 
@@ -2062,7 +2079,7 @@ static int gsi_channel_init_one(struct gsi *gsi,
 	u32 tre_count;
 	int ret;
 
-	if (!gsi_channel_data_valid(gsi, data))
+	if (!gsi_channel_data_valid(gsi, command, data))
 		return -EINVAL;
 
 	/* Worst case we need an event for every outstanding TRE */
@@ -2080,7 +2097,7 @@ static int gsi_channel_init_one(struct gsi *gsi,
 	channel->gsi = gsi;
 	channel->toward_ipa = data->toward_ipa;
 	channel->command = command;
-	channel->tlv_count = data->channel.tlv_count;
+	channel->trans_tre_max = data->channel.tlv_count;
 	channel->tre_count = tre_count;
 	channel->event_count = data->channel.event_count;
 
@@ -2295,13 +2312,5 @@ u32 gsi_channel_tre_max(struct gsi *gsi, u32 channel_id)
 	struct gsi_channel *channel = &gsi->channel[channel_id];
 
 	/* Hardware limit is channel->tre_count - 1 */
-	return channel->tre_count - (channel->tlv_count - 1);
-}
-
-/* Returns the maximum number of TREs in a single transaction for a channel */
-u32 gsi_channel_trans_tre_max(struct gsi *gsi, u32 channel_id)
-{
-	struct gsi_channel *channel = &gsi->channel[channel_id];
-
-	return channel->tlv_count;
+	return channel->tre_count - (channel->trans_tre_max - 1);
 }
diff --git a/drivers/net/ipa/gsi.h b/drivers/net/ipa/gsi.h
index 5d66116b46b0..89dac7fc8c4c 100644
--- a/drivers/net/ipa/gsi.h
+++ b/drivers/net/ipa/gsi.h
@@ -110,7 +110,7 @@ struct gsi_channel {
 	bool toward_ipa;
 	bool command;			/* AP command TX channel or not */
 
-	u8 tlv_count;			/* # entries in TLV FIFO */
+	u8 trans_tre_max;		/* max TREs in a transaction */
 	u16 tre_count;
 	u16 event_count;
 
@@ -189,15 +189,6 @@ void gsi_teardown(struct gsi *gsi);
 u32 gsi_channel_tre_max(struct gsi *gsi, u32 channel_id);
 
 /**
- * gsi_channel_trans_tre_max() - Maximum TREs in a single transaction
- * @gsi:	GSI pointer
- * @channel_id:	Channel whose limit is to be returned
- *
- * Return:	 The maximum TRE count per transaction on the channel
- */
-u32 gsi_channel_trans_tre_max(struct gsi *gsi, u32 channel_id);
-
-/**
  * gsi_channel_start() - Start an allocated GSI channel
  * @gsi:	GSI pointer
  * @channel_id:	Channel to start
diff --git a/drivers/net/ipa/gsi_private.h b/drivers/net/ipa/gsi_private.h
index ea333a244cf5..56450a189907 100644
--- a/drivers/net/ipa/gsi_private.h
+++ b/drivers/net/ipa/gsi_private.h
@@ -105,14 +105,12 @@ void gsi_channel_doorbell(struct gsi_channel *channel);
 void *gsi_ring_virt(struct gsi_ring *ring, u32 index);
 
 /**
- * gsi_channel_tx_queued() - Report the number of bytes queued to hardware
- * @channel:	Channel whose bytes have been queued
+ * gsi_trans_tx_queued() - Report a queued TX channel transaction
+ * @trans:	Transaction being passed to hardware
  *
- * This arranges for the the number of transactions and bytes for
- * transfer that have been queued to hardware to be reported.  It
- * passes this information up the network stack so it can be used to
- * throttle transmissions.
+ * Report to the network stack that a TX transaction is being supplied
+ * to the hardware.
  */
-void gsi_channel_tx_queued(struct gsi_channel *channel);
+void gsi_trans_tx_queued(struct gsi_trans *trans);
 
 #endif /* _GSI_PRIVATE_H_ */
diff --git a/drivers/net/ipa/gsi_trans.c b/drivers/net/ipa/gsi_trans.c
index 55f8fe7d2668..278e467c5430 100644
--- a/drivers/net/ipa/gsi_trans.c
+++ b/drivers/net/ipa/gsi_trans.c
@@ -340,7 +340,7 @@ struct gsi_trans *gsi_channel_trans_alloc(struct gsi *gsi, u32 channel_id,
 	struct gsi_trans_info *trans_info;
 	struct gsi_trans *trans;
 
-	if (WARN_ON(tre_count > gsi_channel_trans_tre_max(gsi, channel_id)))
+	if (WARN_ON(tre_count > channel->trans_tre_max))
 		return NULL;
 
 	trans_info = &channel->trans_info;
@@ -603,7 +603,7 @@ static void __gsi_trans_commit(struct gsi_trans *trans, bool ring_db)
 	if (ring_db || !atomic_read(&channel->trans_info.tre_avail)) {
 		/* Report what we're handing off to hardware for TX channels */
 		if (channel->toward_ipa)
-			gsi_channel_tx_queued(channel);
+			gsi_trans_tx_queued(trans);
 		gsi_channel_doorbell(channel);
 	}
 }
@@ -745,14 +745,10 @@ int gsi_channel_trans_init(struct gsi *gsi, u32 channel_id)
 	 * element is used to fill a single TRE when the transaction is
 	 * committed.  So we need as many scatterlist elements as the
 	 * maximum number of TREs that can be outstanding.
-	 *
-	 * All TREs in a transaction must fit within the channel's TLV FIFO.
-	 * A transaction on a channel can allocate as many TREs as that but
-	 * no more.
 	 */
 	ret = gsi_trans_pool_init(&trans_info->sg_pool,
 				  sizeof(struct scatterlist),
-				  tre_max, channel->tlv_count);
+				  tre_max, channel->trans_tre_max);
 	if (ret)
 		goto err_trans_pool_exit;
 
diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c
index e58cd4478fd3..6dea40259b60 100644
--- a/drivers/net/ipa/ipa_cmd.c
+++ b/drivers/net/ipa/ipa_cmd.c
@@ -353,13 +353,13 @@ int ipa_cmd_pool_init(struct gsi_channel *channel, u32 tre_max)
 	/* This is as good a place as any to validate build constants */
 	ipa_cmd_validate_build();
 
-	/* Even though command payloads are allocated one at a time,
-	 * a single transaction can require up to tlv_count of them,
-	 * so we treat them as if that many can be allocated at once.
+	/* Command payloads are allocated one at a time, but a single
+	 * transaction can require up to the maximum supported by the
+	 * channel; treat them as if they were allocated all at once.
 	 */
 	return gsi_trans_pool_init_dma(dev, &trans_info->cmd_pool,
 				       sizeof(union ipa_cmd_payload),
-				       tre_max, channel->tlv_count);
+				       tre_max, channel->trans_tre_max);
 }
 
 void ipa_cmd_pool_exit(struct gsi_channel *channel)
diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index d3b3255ac3d1..66d2bfdf9e42 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -1020,7 +1020,7 @@ int ipa_endpoint_skb_tx(struct ipa_endpoint *endpoint, struct sk_buff *skb)
 	 * If not, see if we can linearize it before giving up.
 	 */
 	nr_frags = skb_shinfo(skb)->nr_frags;
-	if (1 + nr_frags > endpoint->trans_tre_max) {
+	if (nr_frags > endpoint->skb_frag_max) {
 		if (skb_linearize(skb))
 			return -E2BIG;
 		nr_frags = 0;
@@ -1368,18 +1368,14 @@ static void ipa_endpoint_status_parse(struct ipa_endpoint *endpoint,
 	}
 }
 
-/* Complete a TX transaction, command or from ipa_endpoint_skb_tx() */
-static void ipa_endpoint_tx_complete(struct ipa_endpoint *endpoint,
-				     struct gsi_trans *trans)
-{
-}
-
-/* Complete transaction initiated in ipa_endpoint_replenish_one() */
-static void ipa_endpoint_rx_complete(struct ipa_endpoint *endpoint,
-				     struct gsi_trans *trans)
+void ipa_endpoint_trans_complete(struct ipa_endpoint *endpoint,
+				 struct gsi_trans *trans)
 {
 	struct page *page;
 
+	if (endpoint->toward_ipa)
+		return;
+
 	if (trans->cancelled)
 		goto done;
 
@@ -1393,15 +1389,6 @@ done:
 	ipa_endpoint_replenish(endpoint);
 }
 
-void ipa_endpoint_trans_complete(struct ipa_endpoint *endpoint,
-				 struct gsi_trans *trans)
-{
-	if (endpoint->toward_ipa)
-		ipa_endpoint_tx_complete(endpoint, trans);
-	else
-		ipa_endpoint_rx_complete(endpoint, trans);
-}
-
 void ipa_endpoint_trans_release(struct ipa_endpoint *endpoint,
 				struct gsi_trans *trans)
 {
@@ -1721,7 +1708,7 @@ static void ipa_endpoint_setup_one(struct ipa_endpoint *endpoint)
 	if (endpoint->ee_id != GSI_EE_AP)
 		return;
 
-	endpoint->trans_tre_max = gsi_channel_trans_tre_max(gsi, channel_id);
+	endpoint->skb_frag_max = gsi->channel[channel_id].trans_tre_max - 1;
 	if (!endpoint->toward_ipa) {
 		/* RX transactions require a single TRE, so the maximum
 		 * backlog is the same as the maximum outstanding TREs.
diff --git a/drivers/net/ipa/ipa_endpoint.h b/drivers/net/ipa/ipa_endpoint.h
index 01790c60bee8..28e0a7386fd7 100644
--- a/drivers/net/ipa/ipa_endpoint.h
+++ b/drivers/net/ipa/ipa_endpoint.h
@@ -142,7 +142,7 @@ enum ipa_replenish_flag {
  * @endpoint_id:	IPA endpoint number
  * @toward_ipa:		Endpoint direction (true = TX, false = RX)
  * @config:		Default endpoint configuration
- * @trans_tre_max:	Maximum number of TRE descriptors per transaction
+ * @skb_frag_max:	Maximum allowed number of TX SKB fragments
  * @evt_ring_id:	GSI event ring used by the endpoint
  * @netdev:		Network device pointer, if endpoint uses one
  * @replenish_flags:	Replenishing state flags
@@ -157,7 +157,7 @@ struct ipa_endpoint {
 	bool toward_ipa;
 	struct ipa_endpoint_config config;
 
-	u32 trans_tre_max;
+	u32 skb_frag_max;	/* Used for netdev TX only */
 	u32 evt_ring_id;
 
 	/* Net device this endpoint is associated with, if any */