Merge branch 'net-ipa-small-collected-improvements'

Alex Elder says:

====================
net: ipa: small collected improvements

This series contains a somewhat unrelated set of changes, some
inspired by some recent work posted for back-port.  For the most
part they're meant to improve the code without changing it's
functionality.  Each basically stands on its own.
====================

Link: https://lore.kernel.org/r/20211124202511.862588-1-elder@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

7 files changed, 89 insertions, 77 deletions

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index a2fcdb1abdb9..b611e39167fe 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -339,10 +339,10 @@ static u32 gsi_ring_index(struct gsi_ring *ring, u32 offset)
  * completion to be signaled.  Returns true if the command completes
  * or false if it times out.
  */
-static bool
-gsi_command(struct gsi *gsi, u32 reg, u32 val, struct completion *completion)
+static bool gsi_command(struct gsi *gsi, u32 reg, u32 val)
 {
 	unsigned long timeout = msecs_to_jiffies(GSI_CMD_TIMEOUT);
+	struct completion *completion = &gsi->completion;
 
 	reinit_completion(completion);
 
@@ -366,8 +366,6 @@ gsi_evt_ring_state(struct gsi *gsi, u32 evt_ring_id)
 static void gsi_evt_ring_command(struct gsi *gsi, u32 evt_ring_id,
 				 enum gsi_evt_cmd_opcode opcode)
 {
-	struct gsi_evt_ring *evt_ring = &gsi->evt_ring[evt_ring_id];
-	struct completion *completion = &evt_ring->completion;
 	struct device *dev = gsi->dev;
 	bool timeout;
 	u32 val;
@@ -378,7 +376,7 @@ static void gsi_evt_ring_command(struct gsi *gsi, u32 evt_ring_id,
 	val = u32_encode_bits(evt_ring_id, EV_CHID_FMASK);
 	val |= u32_encode_bits(opcode, EV_OPCODE_FMASK);
 
-	timeout = !gsi_command(gsi, GSI_EV_CH_CMD_OFFSET, val, completion);
+	timeout = !gsi_command(gsi, GSI_EV_CH_CMD_OFFSET, val);
 
 	gsi_irq_ev_ctrl_disable(gsi);
 
@@ -478,7 +476,6 @@ static enum gsi_channel_state gsi_channel_state(struct gsi_channel *channel)
 static void
 gsi_channel_command(struct gsi_channel *channel, enum gsi_ch_cmd_opcode opcode)
 {
-	struct completion *completion = &channel->completion;
 	u32 channel_id = gsi_channel_id(channel);
 	struct gsi *gsi = channel->gsi;
 	struct device *dev = gsi->dev;
@@ -490,7 +487,7 @@ gsi_channel_command(struct gsi_channel *channel, enum gsi_ch_cmd_opcode opcode)
 
 	val = u32_encode_bits(channel_id, CH_CHID_FMASK);
 	val |= u32_encode_bits(opcode, CH_OPCODE_FMASK);
-	timeout = !gsi_command(gsi, GSI_CH_CMD_OFFSET, val, completion);
+	timeout = !gsi_command(gsi, GSI_CH_CMD_OFFSET, val);
 
 	gsi_irq_ch_ctrl_disable(gsi);
 
@@ -1074,13 +1071,10 @@ static void gsi_isr_chan_ctrl(struct gsi *gsi)
 
 	while (channel_mask) {
 		u32 channel_id = __ffs(channel_mask);
-		struct gsi_channel *channel;
 
 		channel_mask ^= BIT(channel_id);
 
-		channel = &gsi->channel[channel_id];
-
-		complete(&channel->completion);
+		complete(&gsi->completion);
 	}
 }
 
@@ -1094,13 +1088,10 @@ static void gsi_isr_evt_ctrl(struct gsi *gsi)
 
 	while (event_mask) {
 		u32 evt_ring_id = __ffs(event_mask);
-		struct gsi_evt_ring *evt_ring;
 
 		event_mask ^= BIT(evt_ring_id);
 
-		evt_ring = &gsi->evt_ring[evt_ring_id];
-
-		complete(&evt_ring->completion);
+		complete(&gsi->completion);
 	}
 }
 
@@ -1110,7 +1101,7 @@ gsi_isr_glob_chan_err(struct gsi *gsi, u32 err_ee, u32 channel_id, u32 code)
 {
 	if (code == GSI_OUT_OF_RESOURCES) {
 		dev_err(gsi->dev, "channel %u out of resources\n", channel_id);
-		complete(&gsi->channel[channel_id].completion);
+		complete(&gsi->completion);
 		return;
 	}
 
@@ -1127,7 +1118,7 @@ gsi_isr_glob_evt_err(struct gsi *gsi, u32 err_ee, u32 evt_ring_id, u32 code)
 		struct gsi_evt_ring *evt_ring = &gsi->evt_ring[evt_ring_id];
 		u32 channel_id = gsi_channel_id(evt_ring->channel);
 
-		complete(&evt_ring->completion);
+		complete(&gsi->completion);
 		dev_err(gsi->dev, "evt_ring for channel %u out of resources\n",
 			channel_id);
 		return;
@@ -1651,7 +1642,6 @@ static void gsi_channel_teardown_one(struct gsi *gsi, u32 channel_id)
 static int gsi_generic_command(struct gsi *gsi, u32 channel_id,
 			       enum gsi_generic_cmd_opcode opcode)
 {
-	struct completion *completion = &gsi->completion;
 	bool timeout;
 	u32 val;
 
@@ -1675,7 +1665,7 @@ static int gsi_generic_command(struct gsi *gsi, u32 channel_id,
 	val |= u32_encode_bits(channel_id, GENERIC_CHID_FMASK);
 	val |= u32_encode_bits(GSI_EE_MODEM, GENERIC_EE_FMASK);
 
-	timeout = !gsi_command(gsi, GSI_GENERIC_CMD_OFFSET, val, completion);
+	timeout = !gsi_command(gsi, GSI_GENERIC_CMD_OFFSET, val);
 
 	/* Disable the GP_INT1 IRQ type again */
 	iowrite32(BIT(ERROR_INT), gsi->virt + GSI_CNTXT_GLOB_IRQ_EN_OFFSET);
@@ -1975,18 +1965,6 @@ static void gsi_channel_evt_ring_exit(struct gsi_channel *channel)
 	gsi_evt_ring_id_free(gsi, evt_ring_id);
 }
 
-/* Init function for event rings; there is no gsi_evt_ring_exit() */
-static void gsi_evt_ring_init(struct gsi *gsi)
-{
-	u32 evt_ring_id = 0;
-
-	gsi->event_bitmap = gsi_event_bitmap_init(GSI_EVT_RING_COUNT_MAX);
-	gsi->ieob_enabled_bitmap = 0;
-	do
-		init_completion(&gsi->evt_ring[evt_ring_id].completion);
-	while (++evt_ring_id < GSI_EVT_RING_COUNT_MAX);
-}
-
 static bool gsi_channel_data_valid(struct gsi *gsi,
 				   const struct ipa_gsi_endpoint_data *data)
 {
@@ -2069,7 +2047,6 @@ static int gsi_channel_init_one(struct gsi *gsi,
 	channel->tlv_count = data->channel.tlv_count;
 	channel->tre_count = tre_count;
 	channel->event_count = data->channel.event_count;
-	init_completion(&channel->completion);
 
 	ret = gsi_channel_evt_ring_init(channel);
 	if (ret)
@@ -2129,7 +2106,8 @@ static int gsi_channel_init(struct gsi *gsi, u32 count,
 	/* IPA v4.2 requires the AP to allocate channels for the modem */
 	modem_alloc = gsi->version == IPA_VERSION_4_2;
 
-	gsi_evt_ring_init(gsi);			/* No matching exit required */
+	gsi->event_bitmap = gsi_event_bitmap_init(GSI_EVT_RING_COUNT_MAX);
+	gsi->ieob_enabled_bitmap = 0;
 
 	/* The endpoint data array is indexed by endpoint name */
 	for (i = 0; i < count; i++) {
diff --git a/drivers/net/ipa/gsi.h b/drivers/net/ipa/gsi.h
index 88b80dc3db79..75dfc7655f3b 100644
--- a/drivers/net/ipa/gsi.h
+++ b/drivers/net/ipa/gsi.h
@@ -114,8 +114,6 @@ struct gsi_channel {
 	u16 tre_count;
 	u16 event_count;
 
-	struct completion completion;	/* signals channel command completion */
-
 	struct gsi_ring tre_ring;
 	u32 evt_ring_id;
 
@@ -141,28 +139,27 @@ enum gsi_evt_ring_state {
 
 struct gsi_evt_ring {
 	struct gsi_channel *channel;
-	struct completion completion;	/* signals event ring state changes */
 	struct gsi_ring ring;
 };
 
 struct gsi {
 	struct device *dev;		/* Same as IPA device */
 	enum ipa_version version;
-	struct net_device dummy_dev;	/* needed for NAPI */
 	void __iomem *virt_raw;		/* I/O mapped address range */
 	void __iomem *virt;		/* Adjusted for most registers */
 	u32 irq;
 	u32 channel_count;
 	u32 evt_ring_count;
-	struct gsi_channel channel[GSI_CHANNEL_COUNT_MAX];
-	struct gsi_evt_ring evt_ring[GSI_EVT_RING_COUNT_MAX];
 	u32 event_bitmap;		/* allocated event rings */
 	u32 modem_channel_bitmap;	/* modem channels to allocate */
 	u32 type_enabled_bitmap;	/* GSI IRQ types enabled */
 	u32 ieob_enabled_bitmap;	/* IEOB IRQ enabled (event rings) */
-	struct completion completion;	/* for global EE commands */
 	int result;			/* Negative errno (generic commands) */
+	struct completion completion;	/* Signals GSI command completion */
 	struct mutex mutex;		/* protects commands, programming */
+	struct gsi_channel channel[GSI_CHANNEL_COUNT_MAX];
+	struct gsi_evt_ring evt_ring[GSI_EVT_RING_COUNT_MAX];
+	struct net_device dummy_dev;	/* needed for NAPI */
 };
 
 /**
diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index ef790fd0ab56..fba576a7717f 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -860,7 +860,7 @@ static void ipa_endpoint_init_hol_block_timer(struct ipa_endpoint *endpoint,
 }
 
 static void
-ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint, bool enable)
+ipa_endpoint_init_hol_block_en(struct ipa_endpoint *endpoint, bool enable)
 {
 	u32 endpoint_id = endpoint->endpoint_id;
 	u32 offset;
@@ -874,6 +874,19 @@ ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint, bool enable)
 		iowrite32(val, endpoint->ipa->reg_virt + offset);
 }
 
+/* Assumes HOL_BLOCK is in disabled state */
+static void ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint,
+					       u32 microseconds)
+{
+	ipa_endpoint_init_hol_block_timer(endpoint, microseconds);
+	ipa_endpoint_init_hol_block_en(endpoint, true);
+}
+
+static void ipa_endpoint_init_hol_block_disable(struct ipa_endpoint *endpoint)
+{
+	ipa_endpoint_init_hol_block_en(endpoint, false);
+}
+
 void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa)
 {
 	u32 i;
@@ -884,9 +897,8 @@ void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa)
 		if (endpoint->toward_ipa || endpoint->ee_id != GSI_EE_MODEM)
 			continue;
 
-		ipa_endpoint_init_hol_block_enable(endpoint, false);
-		ipa_endpoint_init_hol_block_timer(endpoint, 0);
-		ipa_endpoint_init_hol_block_enable(endpoint, true);
+		ipa_endpoint_init_hol_block_disable(endpoint);
+		ipa_endpoint_init_hol_block_enable(endpoint, 0);
 	}
 }
 
@@ -1141,18 +1153,19 @@ static void ipa_endpoint_skb_copy(struct ipa_endpoint *endpoint,
 {
 	struct sk_buff *skb;
 
+	if (!endpoint->netdev)
+		return;
+
 	skb = __dev_alloc_skb(len, GFP_ATOMIC);
-	if (skb) {
-		skb_put(skb, len);
-		memcpy(skb->data, data, len);
-		skb->truesize += extra;
-	}
+	if (!skb)
+		return;
+
+	/* Copy the data into the socket buffer and receive it */
+	skb_put(skb, len);
+	memcpy(skb->data, data, len);
+	skb->truesize += extra;
 
-	/* Now receive it, or drop it if there's no netdev */
-	if (endpoint->netdev)
-		ipa_modem_skb_rx(endpoint->netdev, skb);
-	else if (skb)
-		dev_kfree_skb_any(skb);
+	ipa_modem_skb_rx(endpoint->netdev, skb);
 }
 
 static bool ipa_endpoint_skb_build(struct ipa_endpoint *endpoint,
@@ -1530,6 +1543,8 @@ static void ipa_endpoint_program(struct ipa_endpoint *endpoint)
 	ipa_endpoint_init_hdr_metadata_mask(endpoint);
 	ipa_endpoint_init_mode(endpoint);
 	ipa_endpoint_init_aggr(endpoint);
+	if (!endpoint->toward_ipa)
+		ipa_endpoint_init_hol_block_disable(endpoint);
 	ipa_endpoint_init_deaggr(endpoint);
 	ipa_endpoint_init_rsrc_grp(endpoint);
 	ipa_endpoint_init_seq(endpoint);
diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index cdfa98a76e1f..6960efbe66dd 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -29,6 +29,7 @@
 #include "ipa_mem.h"
 #include "ipa_table.h"
 #include "ipa_modem.h"
+#include "ipa_smp2p.h"
 #include "ipa_uc.h"
 #include "ipa_interrupt.h"
 #include "gsi_trans.h"
@@ -733,7 +734,7 @@ static int ipa_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_endpoint_exit;
 
-	ret = ipa_modem_init(ipa, modem_init);
+	ret = ipa_smp2p_init(ipa, modem_init);
 	if (ret)
 		goto err_table_exit;
 
@@ -775,7 +776,7 @@ err_deconfig:
 	ipa_deconfig(ipa);
 err_power_put:
 	pm_runtime_put_noidle(dev);
-	ipa_modem_exit(ipa);
+	ipa_smp2p_exit(ipa);
 err_table_exit:
 	ipa_table_exit(ipa);
 err_endpoint_exit:
@@ -821,7 +822,7 @@ static int ipa_remove(struct platform_device *pdev)
 	ipa_deconfig(ipa);
 out_power_put:
 	pm_runtime_put_noidle(dev);
-	ipa_modem_exit(ipa);
+	ipa_smp2p_exit(ipa);
 	ipa_table_exit(ipa);
 	ipa_endpoint_exit(ipa);
 	gsi_exit(&ipa->gsi);
diff --git a/drivers/net/ipa/ipa_modem.c b/drivers/net/ipa/ipa_modem.c
index ad116bcc0580..33ac626bd803 100644
--- a/drivers/net/ipa/ipa_modem.c
+++ b/drivers/net/ipa/ipa_modem.c
@@ -442,16 +442,6 @@ static int ipa_modem_notify(struct notifier_block *nb, unsigned long action,
 	return NOTIFY_OK;
 }
 
-int ipa_modem_init(struct ipa *ipa, bool modem_init)
-{
-	return ipa_smp2p_init(ipa, modem_init);
-}
-
-void ipa_modem_exit(struct ipa *ipa)
-{
-	ipa_smp2p_exit(ipa);
-}
-
 int ipa_modem_config(struct ipa *ipa)
 {
 	void *notifier;
diff --git a/drivers/net/ipa/ipa_modem.h b/drivers/net/ipa/ipa_modem.h
index 5e6e3d234454..e64ccc2402e9 100644
--- a/drivers/net/ipa/ipa_modem.h
+++ b/drivers/net/ipa/ipa_modem.h
@@ -18,9 +18,6 @@ void ipa_modem_skb_rx(struct net_device *netdev, struct sk_buff *skb);
 void ipa_modem_suspend(struct net_device *netdev);
 void ipa_modem_resume(struct net_device *netdev);
 
-int ipa_modem_init(struct ipa *ipa, bool modem_init);
-void ipa_modem_exit(struct ipa *ipa);
-
 int ipa_modem_config(struct ipa *ipa);
 void ipa_modem_deconfig(struct ipa *ipa);
 
diff --git a/drivers/net/ipa/ipa_table.c b/drivers/net/ipa/ipa_table.c
index 1da334f54944..2f5a58bfc529 100644
--- a/drivers/net/ipa/ipa_table.c
+++ b/drivers/net/ipa/ipa_table.c
@@ -419,21 +419,26 @@ static void ipa_table_init_add(struct gsi_trans *trans, bool filter,
 	const struct ipa_mem *mem = ipa_mem_find(ipa, mem_id);
 	dma_addr_t hash_addr;
 	dma_addr_t addr;
+	u32 zero_offset;
 	u16 hash_count;
+	u32 zero_size;
 	u16 hash_size;
 	u16 count;
 	u16 size;
 
-	/* The number of filtering endpoints determines number of entries
-	 * in the filter table.  The hashed and non-hashed filter table
-	 * will have the same number of entries.  The size of the route
-	 * table region determines the number of entries it has.
-	 */
+	/* Compute the number of table entries to initialize */
 	if (filter) {
-		/* Include one extra "slot" to hold the filter map itself */
+		/* The number of filtering endpoints determines number of
+		 * entries in the filter table; we also add one more "slot"
+		 * to hold the bitmap itself.  The size of the hashed filter
+		 * table is either the same as the non-hashed one, or zero.
+		 */
 		count = 1 + hweight32(ipa->filter_map);
 		hash_count = hash_mem->size ? count : 0;
 	} else {
+		/* The size of a route table region determines the number
+		 * of entries it has.
+		 */
 		count = mem->size / sizeof(__le64);
 		hash_count = hash_mem->size / sizeof(__le64);
 	}
@@ -445,13 +450,42 @@ static void ipa_table_init_add(struct gsi_trans *trans, bool filter,
 
 	ipa_cmd_table_init_add(trans, opcode, size, mem->offset, addr,
 			       hash_size, hash_mem->offset, hash_addr);
+	if (!filter)
+		return;
+
+	/* Zero the unused space in the filter table */
+	zero_offset = mem->offset + size;
+	zero_size = mem->size - size;
+	ipa_cmd_dma_shared_mem_add(trans, zero_offset, zero_size,
+				   ipa->zero_addr, true);
+	if (!hash_size)
+		return;
+
+	/* Zero the unused space in the hashed filter table */
+	zero_offset = hash_mem->offset + hash_size;
+	zero_size = hash_mem->size - hash_size;
+	ipa_cmd_dma_shared_mem_add(trans, zero_offset, zero_size,
+				   ipa->zero_addr, true);
 }
 
 int ipa_table_setup(struct ipa *ipa)
 {
 	struct gsi_trans *trans;
 
-	trans = ipa_cmd_trans_alloc(ipa, 4);
+	/* We will need at most 8 TREs:
+	 * - IPv4:
+	 *     - One for route table initialization (non-hashed and hashed)
+	 *     - One for filter table initialization (non-hashed and hashed)
+	 *     - One to zero unused entries in the non-hashed filter table
+	 *     - One to zero unused entries in the hashed filter table
+	 * - IPv6:
+	 *     - One for route table initialization (non-hashed and hashed)
+	 *     - One for filter table initialization (non-hashed and hashed)
+	 *     - One to zero unused entries in the non-hashed filter table
+	 *     - One to zero unused entries in the hashed filter table
+	 * All platforms support at least 8 TREs in a transaction.
+	 */
+	trans = ipa_cmd_trans_alloc(ipa, 8);
 	if (!trans) {
 		dev_err(&ipa->pdev->dev, "no transaction for table setup\n");
 		return -EBUSY;