linux-kernel - [PATCH net-next 02/10] net: ipa: allocate transaction before pages when replenishing

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Message-Id: <20220203170927.770572-3-elder@linaro.org>
Date:   Thu,  3 Feb 2022 11:09:19 -0600
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     bjorn.andersson@...aro.org, mka@...omium.org, evgreen@...omium.org,
        cpratapa@...eaurora.org, avuyyuru@...eaurora.org,
        jponduru@...eaurora.org, subashab@...eaurora.org, elder@...nel.org,
        netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 02/10] net: ipa: allocate transaction before pages when replenishing

A transaction failure only occurs if no more transactions are
available for an endpoint.  It's a very cheap test.

When replenishing an RX endpoint buffer, there's no point in
allocating pages if transactions are exhausted.  So don't bother
doing so unless the transaction allocation succeeds.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_endpoint.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index a9f6d4083f869..f8dbd43949e16 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -1046,14 +1046,14 @@ static int ipa_endpoint_replenish_one(struct ipa_endpoint *endpoint)
 	u32 len;
 	int ret;
 
+	trans = ipa_endpoint_trans_alloc(endpoint, 1);
+	if (!trans)
+		return -ENOMEM;
+
 	buffer_size = endpoint->data->rx.buffer_size;
 	page = dev_alloc_pages(get_order(buffer_size));
 	if (!page)
-		return -ENOMEM;
-
-	trans = ipa_endpoint_trans_alloc(endpoint, 1);
-	if (!trans)
-		goto err_free_pages;
+		goto err_trans_free;
 
 	/* Offset the buffer to make space for skb headroom */
 	offset = NET_SKB_PAD;
@@ -1061,7 +1061,7 @@ static int ipa_endpoint_replenish_one(struct ipa_endpoint *endpoint)
 
 	ret = gsi_trans_page_add(trans, page, len, offset);
 	if (ret)
-		goto err_trans_free;
+		goto err_free_pages;
 	trans->data = page;	/* transaction owns page now */
 
 	if (++endpoint->replenish_ready == IPA_REPLENISH_BATCH) {
@@ -1073,10 +1073,10 @@ static int ipa_endpoint_replenish_one(struct ipa_endpoint *endpoint)
 
 	return 0;
 
-err_trans_free:
-	gsi_trans_free(trans);
 err_free_pages:
 	__free_pages(page, get_order(buffer_size));
+err_trans_free:
+	gsi_trans_free(trans);
 
 	return -ENOMEM;
 }
-- 
2.32.0