netdev - [PATCH net-next 1/6] s390/qeth: allocate RX queue at probe time

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Message-Id: <20211118160607.2245947-2-kgraul@linux.ibm.com>
Date:   Thu, 18 Nov 2021 17:06:02 +0100
From:   Karsten Graul <kgraul@...ux.ibm.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        Heiko Carstens <hca@...ux.ibm.com>,
        Julian Wiedmann <jwi@...ux.ibm.com>
Subject: [PATCH net-next 1/6] s390/qeth: allocate RX queue at probe time

From: Julian Wiedmann <jwi@...ux.ibm.com>

We always need an RX queue, and there's no reconfig situation either
where we would need to free & rebuild the queue.

So allocate the RX queue right from the start, and avoid freeing it
during unrelated qeth_free_qdio_queues() calls.

Signed-off-by: Julian Wiedmann <jwi@...ux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@...ux.ibm.com>
---
 drivers/s390/net/qeth_core_main.c | 35 +++++++++++++++----------------
 1 file changed, 17 insertions(+), 18 deletions(-)

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 26c55f67289f..d32aa8b705db 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -194,9 +194,6 @@ static void qeth_clear_working_pool_list(struct qeth_card *card)
 				 &card->qdio.in_buf_pool.entry_list, list)
 		list_del(&pool_entry->list);
 
-	if (!queue)
-		return;
-
 	for (i = 0; i < ARRAY_SIZE(queue->bufs); i++)
 		queue->bufs[i].pool_entry = NULL;
 }
@@ -275,8 +272,8 @@ int qeth_resize_buffer_pool(struct qeth_card *card, unsigned int count)
 
 	QETH_CARD_TEXT(card, 2, "realcbp");
 
-	/* Defer until queue is allocated: */
-	if (!card->qdio.in_q)
+	/* Defer until pool is allocated: */
+	if (list_empty(&pool->entry_list))
 		goto out;
 
 	/* Remove entries from the pool: */
@@ -2557,14 +2554,9 @@ static int qeth_alloc_qdio_queues(struct qeth_card *card)
 		QETH_QDIO_ALLOCATED) != QETH_QDIO_UNINITIALIZED)
 		return 0;
 
-	QETH_CARD_TEXT(card, 2, "inq");
-	card->qdio.in_q = qeth_alloc_qdio_queue();
-	if (!card->qdio.in_q)
-		goto out_nomem;
-
 	/* inbound buffer pool */
 	if (qeth_alloc_buffer_pool(card))
-		goto out_freeinq;
+		goto out_buffer_pool;
 
 	/* outbound */
 	for (i = 0; i < card->qdio.no_out_queues; ++i) {
@@ -2605,10 +2597,7 @@ static int qeth_alloc_qdio_queues(struct qeth_card *card)
 		card->qdio.out_qs[i] = NULL;
 	}
 	qeth_free_buffer_pool(card);
-out_freeinq:
-	qeth_free_qdio_queue(card->qdio.in_q);
-	card->qdio.in_q = NULL;
-out_nomem:
+out_buffer_pool:
 	atomic_set(&card->qdio.state, QETH_QDIO_UNINITIALIZED);
 	return -ENOMEM;
 }
@@ -2623,11 +2612,12 @@ static void qeth_free_qdio_queues(struct qeth_card *card)
 
 	qeth_free_cq(card);
 	for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) {
-		if (card->qdio.in_q->bufs[j].rx_skb)
+		if (card->qdio.in_q->bufs[j].rx_skb) {
 			consume_skb(card->qdio.in_q->bufs[j].rx_skb);
+			card->qdio.in_q->bufs[j].rx_skb = NULL;
+		}
 	}
-	qeth_free_qdio_queue(card->qdio.in_q);
-	card->qdio.in_q = NULL;
+
 	/* inbound buffer pool */
 	qeth_free_buffer_pool(card);
 	/* free outbound qdio_qs */
@@ -6447,6 +6437,12 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
 	qeth_determine_capabilities(card);
 	qeth_set_blkt_defaults(card);
 
+	card->qdio.in_q = qeth_alloc_qdio_queue();
+	if (!card->qdio.in_q) {
+		rc = -ENOMEM;
+		goto err_rx_queue;
+	}
+
 	card->qdio.no_out_queues = card->dev->num_tx_queues;
 	rc = qeth_update_from_chp_desc(card);
 	if (rc)
@@ -6473,6 +6469,8 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
 
 err_setup_disc:
 err_chp_desc:
+	qeth_free_qdio_queue(card->qdio.in_q);
+err_rx_queue:
 	free_netdev(card->dev);
 err_card:
 	qeth_core_free_card(card);
@@ -6494,6 +6492,7 @@ static void qeth_core_remove_device(struct ccwgroup_device *gdev)
 
 	qeth_free_qdio_queues(card);
 
+	qeth_free_qdio_queue(card->qdio.in_q);
 	free_netdev(card->dev);
 	qeth_core_free_card(card);
 	put_device(&gdev->dev);
-- 
2.25.1