netdev - [PATCH] ibmvnic: store RX and TX subCRQ handle array in ibmvnic

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Message-Id: <20200701212553.70956-1-cforno12@linux.ibm.com>
Date:   Wed,  1 Jul 2020 16:25:53 -0500
From:   Cristobal Forno <cforno12@...ux.ibm.com>
To:     netdev@...r.kernel.org
Cc:     tlfalcon@...ux.ibm.com, Cristobal Forno <cforno12@...ux.ibm.com>
Subject: [PATCH] ibmvnic: store RX and TX subCRQ handle array in ibmvnic_adapter struct

Currently the driver reads RX and TX subCRQ handle array directly from
a DMA-mapped buffer address when it needs to make a H_SEND_SUBCRQ
hcall. This patch stores that information in the ibmvnic_sub_crq_queue
structure instead of reading from the buffer received at login.

Signed-off-by: Cristobal Forno <cforno12@...ux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 27 ++++++++++++++++++++-------
 drivers/net/ethernet/ibm/ibmvnic.h |  1 +
 2 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 0fd7eae25fe9..ca0d88aab6da 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -305,6 +305,7 @@ static void deactivate_rx_pools(struct ibmvnic_adapter *adapter)
 static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
 			      struct ibmvnic_rx_pool *pool)
 {
+	u64 *handle_array = adapter->rx_scrq[pool->index]->handle_array;
 	int count = pool->size - atomic_read(&pool->available);
 	struct device *dev = &adapter->vdev->dev;
 	int buffers_added = 0;
@@ -314,7 +315,6 @@ static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
 	unsigned int offset;
 	dma_addr_t dma_addr;
 	unsigned char *dst;
-	u64 *handle_array;
 	int shift = 0;
 	int index;
 	int i;
@@ -322,10 +322,6 @@ static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
 	if (!pool->active)
 		return;
 
-	handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
-				      be32_to_cpu(adapter->login_rsp_buf->
-				      off_rxadd_subcrqs));
-
 	for (i = 0; i < count; ++i) {
 		skb = alloc_skb(pool->buff_size, GFP_ATOMIC);
 		if (!skb) {
@@ -1553,8 +1549,7 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 
 	tx_scrq = adapter->tx_scrq[queue_num];
 	txq = netdev_get_tx_queue(netdev, skb_get_queue_mapping(skb));
-	handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
-		be32_to_cpu(adapter->login_rsp_buf->off_txsubm_subcrqs));
+	handle_array = tx_scrq->handle_array;
 
 	index = tx_pool->free_map[tx_pool->consumer_index];
 
@@ -4292,6 +4287,8 @@ static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
 	struct net_device *netdev = adapter->netdev;
 	struct ibmvnic_login_rsp_buffer *login_rsp = adapter->login_rsp_buf;
 	struct ibmvnic_login_buffer *login = adapter->login_buf;
+	int num_tx_pools;
+	int num_rx_pools;
 	int i;
 
 	dma_unmap_single(dev, adapter->login_buf_token, adapter->login_buf_sz,
@@ -4326,6 +4323,22 @@ static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
 		ibmvnic_remove(adapter->vdev);
 		return -EIO;
 	}
+
+	num_tx_pools = be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
+	num_rx_pools = be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
+
+	for (i = 0; i < num_tx_pools; i++)
+		adapter->tx_scrq[i]->handle_array =
+			(u64 *)((u8 *)(adapter->login_rsp_buf) +
+				be32_to_cpu(adapter->login_rsp_buf->
+					    off_txsubm_subcrqs));
+
+	for (i = 0; i < num_rx_pools; i++)
+		adapter->rx_scrq[i]->handle_array =
+			(u64 *)((u8 *)(adapter->login_rsp_buf) +
+				be32_to_cpu(adapter->login_rsp_buf->
+					    off_rxadd_subcrqs));
+
 	release_login_buffer(adapter);
 	complete(&adapter->init_done);
 
diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h
index f8416e1d4cf0..e51c72d1e357 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.h
+++ b/drivers/net/ethernet/ibm/ibmvnic.h
@@ -875,6 +875,7 @@ struct ibmvnic_sub_crq_queue {
 	struct ibmvnic_adapter *adapter;
 	atomic_t used;
 	char name[32];
+	u64 *handle_array;
 };
 
 struct ibmvnic_long_term_buff {
-- 
2.27.0