linux-kernel - [PATCH net-next 6/6] net: ipa: derive channel from transaction

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Date:   Fri, 10 Jun 2022 10:46:15 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     mka@...omium.org, evgreen@...omium.org, bjorn.andersson@...aro.org,
        quic_cpratapa@...cinc.com, quic_avuyyuru@...cinc.com,
        quic_jponduru@...cinc.com, quic_subashab@...cinc.com,
        elder@...nel.org, netdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 6/6] net: ipa: derive channel from transaction

In gsi_channel_tx_queued(), we report when a transaction gets passed
to hardware.  Change that function so it takes transaction rather
than a channel as its argument, and derive the channel from the
transaction.  Rename the function accordingly.

Delete the header comments above the function definition; the ones
above the declaration in "gsi_private.h" should suffice.  In
addition, the comments above gsi_channel_tx_update() do a fine job
of explaining what's going on.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/gsi.c         | 28 +++++++---------------------
 drivers/net/ipa/gsi_private.h | 12 +++++-------
 drivers/net/ipa/gsi_trans.c   |  2 +-
 3 files changed, 13 insertions(+), 29 deletions(-)

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index 64417668b8a9a..5b446d2a07c8a 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -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);
 }
 
 /**
diff --git a/drivers/net/ipa/gsi_private.h b/drivers/net/ipa/gsi_private.h
index ea333a244cf5e..56450a1899074 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 870a4c1752838..278e467c5430b 100644
--- a/drivers/net/ipa/gsi_trans.c
+++ b/drivers/net/ipa/gsi_trans.c
@@ -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);
 	}
 }
-- 
2.34.1