qeth: remove EDDP

Performance measurements showed EDDP does not lower CPU costs but increase
them. So we dump out EDDP code from qeth driver.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 73 deletions

diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index 7632d1208844..9e628b322bd3 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -21,7 +21,6 @@
 #include <linux/ip.h>
 
 #include "qeth_core.h"
-#include "qeth_core_offl.h"
 
 static int qeth_l2_set_offline(struct ccwgroup_device *);
 static int qeth_l2_stop(struct net_device *);
@@ -634,8 +633,6 @@ static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	struct qeth_qdio_out_q *queue = card->qdio.out_qs
 		[qeth_get_priority_queue(card, skb, ipv, cast_type)];
 	int tx_bytes = skb->len;
-	enum qeth_large_send_types large_send = QETH_LARGE_SEND_NO;
-	struct qeth_eddp_context *ctx = NULL;
 	int data_offset = -1;
 	int elements_needed = 0;
 	int hd_len = 0;
@@ -655,14 +652,10 @@ static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	}
 	netif_stop_queue(dev);
 
-	if (skb_is_gso(skb))
-		large_send = QETH_LARGE_SEND_EDDP;
-
 	if (card->info.type == QETH_CARD_TYPE_OSN)
 		hdr = (struct qeth_hdr *)skb->data;
 	else {
-		if ((card->info.type == QETH_CARD_TYPE_IQD) && (!large_send) &&
-		    (skb_shinfo(skb)->nr_frags == 0)) {
+		if (card->info.type == QETH_CARD_TYPE_IQD) {
 			new_skb = skb;
 			data_offset = ETH_HLEN;
 			hd_len = ETH_HLEN;
@@ -689,62 +682,26 @@ static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		}
 	}
 
-	if (large_send == QETH_LARGE_SEND_EDDP) {
-		ctx = qeth_eddp_create_context(card, new_skb, hdr,
-						skb->sk->sk_protocol);
-		if (ctx == NULL) {
-			QETH_DBF_MESSAGE(2, "could not create eddp context\n");
-			goto tx_drop;
-		}
-	} else {
-		elements = qeth_get_elements_no(card, (void *)hdr, new_skb,
+	elements = qeth_get_elements_no(card, (void *)hdr, new_skb,
 						elements_needed);
-		if (!elements) {
-			if (data_offset >= 0)
-				kmem_cache_free(qeth_core_header_cache, hdr);
-			goto tx_drop;
-		}
-	}
-
-	if ((large_send == QETH_LARGE_SEND_NO) &&
-	    (skb->ip_summed == CHECKSUM_PARTIAL)) {
-		qeth_tx_csum(new_skb);
-		if (card->options.performance_stats)
-			card->perf_stats.tx_csum++;
+	if (!elements) {
+		if (data_offset >= 0)
+			kmem_cache_free(qeth_core_header_cache, hdr);
+		goto tx_drop;
 	}
 
 	if (card->info.type != QETH_CARD_TYPE_IQD)
 		rc = qeth_do_send_packet(card, queue, new_skb, hdr,
-					 elements, ctx);
+					 elements);
 	else
 		rc = qeth_do_send_packet_fast(card, queue, new_skb, hdr,
-					elements, ctx, data_offset, hd_len);
+					elements, data_offset, hd_len);
 	if (!rc) {
 		card->stats.tx_packets++;
 		card->stats.tx_bytes += tx_bytes;
 		if (new_skb != skb)
 			dev_kfree_skb_any(skb);
-		if (card->options.performance_stats) {
-			if (large_send != QETH_LARGE_SEND_NO) {
-				card->perf_stats.large_send_bytes += tx_bytes;
-				card->perf_stats.large_send_cnt++;
-			}
-			if (skb_shinfo(new_skb)->nr_frags > 0) {
-				card->perf_stats.sg_skbs_sent++;
-				/* nr_frags + skb->data */
-				card->perf_stats.sg_frags_sent +=
-					skb_shinfo(new_skb)->nr_frags + 1;
-			}
-		}
-
-		if (ctx != NULL) {
-			qeth_eddp_put_context(ctx);
-			dev_kfree_skb_any(new_skb);
-		}
 	} else {
-		if (ctx != NULL)
-			qeth_eddp_put_context(ctx);
-
 		if (data_offset >= 0)
 			kmem_cache_free(qeth_core_header_cache, hdr);
 
@@ -881,30 +838,8 @@ static void qeth_l2_remove_device(struct ccwgroup_device *cgdev)
 	return;
 }
 
-static int qeth_l2_ethtool_set_tso(struct net_device *dev, u32 data)
-{
-	struct qeth_card *card = dev->ml_priv;
-
-	if (data) {
-		if (card->options.large_send == QETH_LARGE_SEND_NO) {
-			card->options.large_send = QETH_LARGE_SEND_EDDP;
-			dev->features |= NETIF_F_TSO;
-		}
-	} else {
-		dev->features &= ~NETIF_F_TSO;
-		card->options.large_send = QETH_LARGE_SEND_NO;
-	}
-	return 0;
-}
-
 static struct ethtool_ops qeth_l2_ethtool_ops = {
 	.get_link = ethtool_op_get_link,
-	.get_tx_csum = ethtool_op_get_tx_csum,
-	.set_tx_csum = ethtool_op_set_tx_hw_csum,
-	.get_sg = ethtool_op_get_sg,
-	.set_sg = ethtool_op_set_sg,
-	.get_tso = ethtool_op_get_tso,
-	.set_tso = qeth_l2_ethtool_set_tso,
 	.get_strings = qeth_core_get_strings,
 	.get_ethtool_stats = qeth_core_get_ethtool_stats,
 	.get_stats_count = qeth_core_get_stats_count,