netdev - [PATCH net-next 06/12] ibmvnic: Clean up TX code and TX buffer data structure

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Message-Id: <1605208207-1896-7-git-send-email-tlfalcon@linux.ibm.com>
Date:   Thu, 12 Nov 2020 13:10:01 -0600
From:   Thomas Falcon <tlfalcon@...ux.ibm.com>
To:     netdev@...r.kernel.org
Cc:     linuxppc-dev@...ts.ozlabs.org, dnbanerg@...ibm.com,
        brking@...ux.vnet.ibm.com, pradeep@...ibm.com,
        drt@...ux.vnet.ibm.com, sukadev@...ux.vnet.ibm.com,
        ljp@...ux.vnet.ibm.com, cforno12@...ux.ibm.com,
        tlfalcon@...ux.ibm.com, ricklind@...ux.ibm.com
Subject: [PATCH net-next 06/12] ibmvnic: Clean up TX code and TX buffer data structure

Remove unused and superfluous code and members in
existing TX implementation and data structures.

Signed-off-by: Thomas Falcon <tlfalcon@...ux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 31 +++++++++++-------------------
 drivers/net/ethernet/ibm/ibmvnic.h |  8 --------
 2 files changed, 11 insertions(+), 28 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index c9437b2d1aa8..b523da20bffc 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1496,17 +1496,18 @@ static int create_hdr_descs(u8 hdr_field, u8 *hdr_data, int len, int *hdr_len,
  * L2/L3/L4 packet header descriptors to be sent by send_subcrq_indirect.
  */
 
-static void build_hdr_descs_arr(struct ibmvnic_tx_buff *txbuff,
+static void build_hdr_descs_arr(struct sk_buff *skb,
+				union sub_crq *indir_arr,
 				int *num_entries, u8 hdr_field)
 {
 	int hdr_len[3] = {0, 0, 0};
+	u8 hdr_data[140] = {0};
 	int tot_len;
-	u8 *hdr_data = txbuff->hdr_data;
 
-	tot_len = build_hdr_data(hdr_field, txbuff->skb, hdr_len,
-				 txbuff->hdr_data);
+	tot_len = build_hdr_data(hdr_field, skb, hdr_len,
+				 hdr_data);
 	*num_entries += create_hdr_descs(hdr_field, hdr_data, tot_len, hdr_len,
-			 txbuff->indir_arr + 1);
+					 indir_arr + 1);
 }
 
 static int ibmvnic_xmit_workarounds(struct sk_buff *skb,
@@ -1537,6 +1538,7 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 	unsigned int tx_send_failed = 0;
 	netdev_tx_t ret = NETDEV_TX_OK;
 	unsigned int tx_map_failed = 0;
+	union sub_crq indir_arr[16];
 	unsigned int tx_dropped = 0;
 	unsigned int tx_packets = 0;
 	unsigned int tx_bytes = 0;
@@ -1620,11 +1622,8 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 
 	tx_buff = &tx_pool->tx_buff[index];
 	tx_buff->skb = skb;
-	tx_buff->data_dma[0] = data_dma_addr;
-	tx_buff->data_len[0] = skb->len;
 	tx_buff->index = index;
 	tx_buff->pool_index = queue_num;
-	tx_buff->last_frag = true;
 
 	memset(&tx_crq, 0, sizeof(tx_crq));
 	tx_crq.v1.first = IBMVNIC_CRQ_CMD;
@@ -1671,7 +1670,7 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 	}
 
 	if ((*hdrs >> 7) & 1)
-		build_hdr_descs_arr(tx_buff, &num_entries, *hdrs);
+		build_hdr_descs_arr(skb, indir_arr, &num_entries, *hdrs);
 
 	netdev_tx_sent_queue(txq, skb->len);
 
@@ -1688,8 +1687,8 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 		ind_bufp->index = 0;
 	}
 
-	tx_buff->indir_arr[0] = tx_crq;
-	memcpy(&ind_bufp->indir_arr[ind_bufp->index], tx_buff->indir_arr,
+	indir_arr[0] = tx_crq;
+	memcpy(&ind_bufp->indir_arr[ind_bufp->index], &indir_arr[0],
 	       num_entries * sizeof(struct ibmvnic_generic_scrq));
 	ind_bufp->index += num_entries;
 	if (!netdev_xmit_more() || netif_xmit_stopped(txq) ||
@@ -3140,7 +3139,7 @@ static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
 	struct netdev_queue *txq;
 	union sub_crq *next;
 	int index;
-	int i, j;
+	int i;
 
 restart_loop:
 	while (pending_scrq(adapter, scrq)) {
@@ -3169,14 +3168,6 @@ static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
 			}
 
 			txbuff = &tx_pool->tx_buff[index];
-
-			for (j = 0; j < IBMVNIC_MAX_FRAGS_PER_CRQ; j++) {
-				if (!txbuff->data_dma[j])
-					continue;
-
-				txbuff->data_dma[j] = 0;
-			}
-
 			num_packets++;
 			num_entries += txbuff->num_entries;
 			if (txbuff->skb) {
diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h
index 05bf212d387d..11af1f29210b 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.h
+++ b/drivers/net/ethernet/ibm/ibmvnic.h
@@ -225,8 +225,6 @@ struct ibmvnic_tx_comp_desc {
 #define IBMVNIC_TCP_CHKSUM		0x20
 #define IBMVNIC_UDP_CHKSUM		0x08
 
-#define IBMVNIC_MAX_FRAGS_PER_CRQ 3
-
 struct ibmvnic_tx_desc {
 	u8 first;
 	u8 type;
@@ -897,14 +895,8 @@ struct ibmvnic_long_term_buff {
 
 struct ibmvnic_tx_buff {
 	struct sk_buff *skb;
-	dma_addr_t data_dma[IBMVNIC_MAX_FRAGS_PER_CRQ];
-	unsigned int data_len[IBMVNIC_MAX_FRAGS_PER_CRQ];
 	int index;
 	int pool_index;
-	bool last_frag;
-	union sub_crq indir_arr[6];
-	u8 hdr_data[140];
-	dma_addr_t indir_dma;
 	int num_entries;
 };
 
-- 
2.26.2