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>

drivers/s390/net/Makefile

@@ -8,7 +8,7 @@ obj-$(CONFIG_NETIUCV) += netiucv.o fsm.o
 obj-$(CONFIG_SMSGIUCV) += smsgiucv.o
 obj-$(CONFIG_LCS) += lcs.o cu3088.o
 obj-$(CONFIG_CLAW) += claw.o cu3088.o
-qeth-y += qeth_core_sys.o qeth_core_main.o qeth_core_mpc.o qeth_core_offl.o
+qeth-y += qeth_core_sys.o qeth_core_main.o qeth_core_mpc.o
 obj-$(CONFIG_QETH) += qeth.o
 qeth_l2-y += qeth_l2_main.o
 obj-$(CONFIG_QETH_L2) += qeth_l2.o

drivers/s390/net/qeth_core.h

@@ -404,7 +404,6 @@ struct qeth_qdio_q {
 /* possible types of qeth large_send support */
 enum qeth_large_send_types {
 	QETH_LARGE_SEND_NO,
-	QETH_LARGE_SEND_EDDP,
 	QETH_LARGE_SEND_TSO,
 };
 
@@ -839,11 +838,9 @@ int qeth_get_cast_type(struct qeth_card *, struct sk_buff *);
 int qeth_get_priority_queue(struct qeth_card *, struct sk_buff *, int, int);
 int qeth_get_elements_no(struct qeth_card *, void *, struct sk_buff *, int);
 int qeth_do_send_packet_fast(struct qeth_card *, struct qeth_qdio_out_q *,
-			struct sk_buff *, struct qeth_hdr *, int,
-			struct qeth_eddp_context *, int, int);
+			struct sk_buff *, struct qeth_hdr *, int, int, int);
 int qeth_do_send_packet(struct qeth_card *, struct qeth_qdio_out_q *,
-		    struct sk_buff *, struct qeth_hdr *,
-		    int, struct qeth_eddp_context *);
+		    struct sk_buff *, struct qeth_hdr *, int);
 int qeth_core_get_stats_count(struct net_device *);
 void qeth_core_get_ethtool_stats(struct net_device *,
 				struct ethtool_stats *, u64 *);

drivers/s390/net/qeth_core_main.c

@@ -17,7 +17,6 @@
 #include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/ip.h>
-#include <linux/ipv6.h>
 #include <linux/tcp.h>
 #include <linux/mii.h>
 #include <linux/kthread.h>
@@ -26,7 +25,6 @@
 #include <asm/io.h>
 
 #include "qeth_core.h"
-#include "qeth_core_offl.h"
 
 struct qeth_dbf_info qeth_dbf[QETH_DBF_INFOS] = {
 	/* define dbf - Name, Pages, Areas, Maxlen, Level, View, Handle */
@@ -285,17 +283,6 @@ int qeth_set_large_send(struct qeth_card *card,
 		netif_tx_disable(card->dev);
 	card->options.large_send = type;
 	switch (card->options.large_send) {
-	case QETH_LARGE_SEND_EDDP:
-		if (card->info.type != QETH_CARD_TYPE_IQD) {
-			card->dev->features |= NETIF_F_TSO | NETIF_F_SG |
-					NETIF_F_HW_CSUM;
-		} else {
-			card->dev->features &= ~(NETIF_F_TSO | NETIF_F_SG |
-						NETIF_F_HW_CSUM);
-			card->options.large_send = QETH_LARGE_SEND_NO;
-			rc = -EOPNOTSUPP;
-		}
-		break;
 	case QETH_LARGE_SEND_TSO:
 		if (qeth_is_supported(card, IPA_OUTBOUND_TSO)) {
 			card->dev->features |= NETIF_F_TSO | NETIF_F_SG |
@@ -956,7 +943,6 @@ static void qeth_clear_output_buffer(struct qeth_qdio_out_q *queue,
 		dev_kfree_skb_any(skb);
 		skb = skb_dequeue(&buf->skb_list);
 	}
-	qeth_eddp_buf_release_contexts(buf);
 	for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(queue->card); ++i) {
 		if (buf->buffer->element[i].addr && buf->is_header[i])
 			kmem_cache_free(qeth_core_header_cache,
@@ -3187,11 +3173,9 @@ static inline int qeth_fill_buffer(struct qeth_qdio_out_q *queue,
 int qeth_do_send_packet_fast(struct qeth_card *card,
 		struct qeth_qdio_out_q *queue, struct sk_buff *skb,
 		struct qeth_hdr *hdr, int elements_needed,
-		struct qeth_eddp_context *ctx, int offset, int hd_len)
+		int offset, int hd_len)
 {
 	struct qeth_qdio_out_buffer *buffer;
-	int buffers_needed = 0;
-	int flush_cnt = 0;
 	int index;
 
 	/* spin until we get the queue ... */
@@ -3206,27 +3190,11 @@ int qeth_do_send_packet_fast(struct qeth_card *card,
 	 */
 	if (atomic_read(&buffer->state) != QETH_QDIO_BUF_EMPTY)
 		goto out;
-	if (ctx == NULL)
-		queue->next_buf_to_fill = (queue->next_buf_to_fill + 1) %
+	queue->next_buf_to_fill = (queue->next_buf_to_fill + 1) %
 					  QDIO_MAX_BUFFERS_PER_Q;
-	else {
-		buffers_needed = qeth_eddp_check_buffers_for_context(queue,
-									ctx);
-		if (buffers_needed < 0)
-			goto out;
-		queue->next_buf_to_fill =
-			(queue->next_buf_to_fill + buffers_needed) %
-			QDIO_MAX_BUFFERS_PER_Q;
-	}
 	atomic_set(&queue->state, QETH_OUT_Q_UNLOCKED);
-	if (ctx == NULL) {
-		qeth_fill_buffer(queue, buffer, skb, hdr, offset, hd_len);
-		qeth_flush_buffers(queue, index, 1);
-	} else {
-		flush_cnt = qeth_eddp_fill_buffer(queue, ctx, index);
-		WARN_ON(buffers_needed != flush_cnt);
-		qeth_flush_buffers(queue, index, flush_cnt);
-	}
+	qeth_fill_buffer(queue, buffer, skb, hdr, offset, hd_len);
+	qeth_flush_buffers(queue, index, 1);
 	return 0;
 out:
 	atomic_set(&queue->state, QETH_OUT_Q_UNLOCKED);
@@ -3236,7 +3204,7 @@ EXPORT_SYMBOL_GPL(qeth_do_send_packet_fast);
 
 int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue,
 		struct sk_buff *skb, struct qeth_hdr *hdr,
-		int elements_needed, struct qeth_eddp_context *ctx)
+		int elements_needed)
 {
 	struct qeth_qdio_out_buffer *buffer;
 	int start_index;
@@ -3262,53 +3230,32 @@ int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue,
 	qeth_switch_to_packing_if_needed(queue);
 	if (queue->do_pack) {
 		do_pack = 1;
-		if (ctx == NULL) {
-			/* does packet fit in current buffer? */
-			if ((QETH_MAX_BUFFER_ELEMENTS(card) -
-			    buffer->next_element_to_fill) < elements_needed) {
-				/* ... no -> set state PRIMED */
-				atomic_set(&buffer->state,
-					QETH_QDIO_BUF_PRIMED);
-				flush_count++;
-				queue->next_buf_to_fill =
-					(queue->next_buf_to_fill + 1) %
-					QDIO_MAX_BUFFERS_PER_Q;
-				buffer = &queue->bufs[queue->next_buf_to_fill];
-				/* we did a step forward, so check buffer state
-				 * again */
-				if (atomic_read(&buffer->state) !=
-						QETH_QDIO_BUF_EMPTY){
-					qeth_flush_buffers(queue, start_index,
+		/* does packet fit in current buffer? */
+		if ((QETH_MAX_BUFFER_ELEMENTS(card) -
+		    buffer->next_element_to_fill) < elements_needed) {
+			/* ... no -> set state PRIMED */
+			atomic_set(&buffer->state, QETH_QDIO_BUF_PRIMED);
+			flush_count++;
+			queue->next_buf_to_fill =
+				(queue->next_buf_to_fill + 1) %
+				QDIO_MAX_BUFFERS_PER_Q;
+			buffer = &queue->bufs[queue->next_buf_to_fill];
+			/* we did a step forward, so check buffer state
+			 * again */
+			if (atomic_read(&buffer->state) !=
+			    QETH_QDIO_BUF_EMPTY) {
+				qeth_flush_buffers(queue, start_index,
 							   flush_count);
-					atomic_set(&queue->state,
+				atomic_set(&queue->state,
 						QETH_OUT_Q_UNLOCKED);
-					return -EBUSY;
-				}
-			}
-		} else {
-			/* check if we have enough elements (including following
-			 * free buffers) to handle eddp context */
-			if (qeth_eddp_check_buffers_for_context(queue, ctx)
-				< 0) {
-				rc = -EBUSY;
-				goto out;
+				return -EBUSY;
 			}
 		}
 	}
-	if (ctx == NULL)
-		tmp = qeth_fill_buffer(queue, buffer, skb, hdr, -1, 0);
-	else {
-		tmp = qeth_eddp_fill_buffer(queue, ctx,
-						queue->next_buf_to_fill);
-		if (tmp < 0) {
-			rc = -EBUSY;
-			goto out;
-		}
-	}
+	tmp = qeth_fill_buffer(queue, buffer, skb, hdr, -1, 0);
 	queue->next_buf_to_fill = (queue->next_buf_to_fill + tmp) %
 				  QDIO_MAX_BUFFERS_PER_Q;
 	flush_count += tmp;
-out:
 	if (flush_count)
 		qeth_flush_buffers(queue, start_index, flush_count);
 	else if (!atomic_read(&queue->set_pci_flags_count))

drivers/s390/net/qeth_core_offl.h

-/*
- *  drivers/s390/net/qeth_core_offl.h
- *
- *    Copyright IBM Corp. 2007
- *    Author(s): Thomas Spatzier <tspat@de.ibm.com>,
- *		 Frank Blaschka <frank.blaschka@de.ibm.com>
- */
-
-#ifndef __QETH_CORE_OFFL_H__
-#define __QETH_CORE_OFFL_H__
-
-struct qeth_eddp_element {
-	u32 flags;
-	u32 length;
-	void *addr;
-};
-
-struct qeth_eddp_context {
-	atomic_t refcnt;
-	enum qeth_large_send_types type;
-	int num_pages;			    /* # of allocated pages */
-	u8 **pages;			    /* pointers to pages */
-	int offset;			    /* offset in ctx during creation */
-	int num_elements;		    /* # of required 'SBALEs' */
-	struct qeth_eddp_element *elements; /* array of 'SBALEs' */
-	int elements_per_skb;		    /* # of 'SBALEs' per skb **/
-};
-
-struct qeth_eddp_context_reference {
-	struct list_head list;
-	struct qeth_eddp_context *ctx;
-};
-
-struct qeth_eddp_data {
-	struct qeth_hdr qh;
-	struct ethhdr mac;
-	__be16 vlan[2];
-	union {
-		struct {
-			struct iphdr h;
-			u8 options[40];
-		} ip4;
-		struct {
-			struct ipv6hdr h;
-		} ip6;
-	} nh;
-	u8 nhl;
-	void *nh_in_ctx;	/* address of nh within the ctx */
-	union {
-		struct {
-			struct tcphdr h;
-			u8 options[40];
-		} tcp;
-	} th;
-	u8 thl;
-	void *th_in_ctx;	/* address of th within the ctx */
-	struct sk_buff *skb;
-	int skb_offset;
-	int frag;
-	int frag_offset;
-} __attribute__ ((packed));
-
-extern struct qeth_eddp_context *qeth_eddp_create_context(struct qeth_card *,
-		 struct sk_buff *, struct qeth_hdr *, unsigned char);
-extern void qeth_eddp_put_context(struct qeth_eddp_context *);
-extern int qeth_eddp_fill_buffer(struct qeth_qdio_out_q *,
-		struct qeth_eddp_context *, int);
-extern void qeth_eddp_buf_release_contexts(struct qeth_qdio_out_buffer *);
-extern int qeth_eddp_check_buffers_for_context(struct qeth_qdio_out_q *,
-		struct qeth_eddp_context *);
-
-void qeth_tso_fill_header(struct qeth_card *, struct qeth_hdr *,
-		struct sk_buff *);
-void qeth_tx_csum(struct sk_buff *skb);
-
-#endif /* __QETH_CORE_EDDP_H__ */

drivers/s390/net/qeth_core_sys.c

@@ -427,8 +427,6 @@ static ssize_t qeth_dev_large_send_show(struct device *dev,
 	switch (card->options.large_send) {
 	case QETH_LARGE_SEND_NO:
 		return sprintf(buf, "%s\n", "no");
-	case QETH_LARGE_SEND_EDDP:
-		return sprintf(buf, "%s\n", "EDDP");
 	case QETH_LARGE_SEND_TSO:
 		return sprintf(buf, "%s\n", "TSO");
 	default:
@@ -449,8 +447,6 @@ static ssize_t qeth_dev_large_send_store(struct device *dev,
 	tmp = strsep((char **) &buf, "\n");
 	if (!strcmp(tmp, "no")) {
 		type = QETH_LARGE_SEND_NO;
-	} else if (!strcmp(tmp, "EDDP")) {
-		type = QETH_LARGE_SEND_EDDP;
 	} else if (!strcmp(tmp, "TSO")) {
 		type = QETH_LARGE_SEND_TSO;
 	} else {

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,

drivers/s390/net/qeth_l3_main.c

@@ -19,15 +19,15 @@
 #include <linux/etherdevice.h>
 #include <linux/mii.h>
 #include <linux/ip.h>
-#include <linux/reboot.h>
+#include <linux/ipv6.h>
 #include <linux/inetdevice.h>
 #include <linux/igmp.h>
 
 #include <net/ip.h>
 #include <net/arp.h>
+#include <net/ip6_checksum.h>
 
 #include "qeth_l3.h"
-#include "qeth_core_offl.h"
 
 static int qeth_l3_set_offline(struct ccwgroup_device *);
 static int qeth_l3_recover(void *);
@@ -2577,12 +2577,63 @@ static void qeth_l3_fill_header(struct qeth_card *card, struct qeth_hdr *hdr,
 	}
 }
 
+static void qeth_tso_fill_header(struct qeth_card *card,
+		struct qeth_hdr *qhdr, struct sk_buff *skb)
+{
+	struct qeth_hdr_tso *hdr = (struct qeth_hdr_tso *)qhdr;
+	struct tcphdr *tcph = tcp_hdr(skb);
+	struct iphdr *iph = ip_hdr(skb);
+	struct ipv6hdr *ip6h = ipv6_hdr(skb);
+
+	/*fix header to TSO values ...*/
+	hdr->hdr.hdr.l3.id = QETH_HEADER_TYPE_TSO;
+	/*set values which are fix for the first approach ...*/
+	hdr->ext.hdr_tot_len = (__u16) sizeof(struct qeth_hdr_ext_tso);
+	hdr->ext.imb_hdr_no  = 1;
+	hdr->ext.hdr_type    = 1;
+	hdr->ext.hdr_version = 1;
+	hdr->ext.hdr_len     = 28;
+	/*insert non-fix values */
+	hdr->ext.mss = skb_shinfo(skb)->gso_size;
+	hdr->ext.dg_hdr_len = (__u16)(iph->ihl*4 + tcph->doff*4);
+	hdr->ext.payload_len = (__u16)(skb->len - hdr->ext.dg_hdr_len -
+				       sizeof(struct qeth_hdr_tso));
+	tcph->check = 0;
+	if (skb->protocol == ETH_P_IPV6) {
+		ip6h->payload_len = 0;
+		tcph->check = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
+					       0, IPPROTO_TCP, 0);
+	} else {
+		/*OSA want us to set these values ...*/
+		tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
+					 0, IPPROTO_TCP, 0);
+		iph->tot_len = 0;
+		iph->check = 0;
+	}
+}
+
+static void qeth_tx_csum(struct sk_buff *skb)
+{
+	__wsum csum;
+	int offset;
+
+	skb_set_transport_header(skb, skb->csum_start - skb_headroom(skb));
+	offset = skb->csum_start - skb_headroom(skb);
+	BUG_ON(offset >= skb_headlen(skb));
+	csum = skb_checksum(skb, offset, skb->len - offset, 0);
+
+	offset += skb->csum_offset;
+	BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
+	*(__sum16 *)(skb->data + offset) = csum_fold(csum);
+}
+
 static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	int rc;
 	u16 *tag;
 	struct qeth_hdr *hdr = NULL;
 	int elements_needed = 0;
+	int elems;
 	struct qeth_card *card = dev->ml_priv;
 	struct sk_buff *new_skb = NULL;
 	int ipv = qeth_get_ip_version(skb);
@@ -2591,8 +2642,8 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		[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 nr_frags;
 
 	if ((card->info.type == QETH_CARD_TYPE_IQD) &&
 	    (skb->protocol != htons(ETH_P_IPV6)) &&
@@ -2615,6 +2666,12 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	if (skb_is_gso(skb))
 		large_send = card->options.large_send;
+	else
+		if (skb->ip_summed == CHECKSUM_PARTIAL) {
+			qeth_tx_csum(skb);
+			if (card->options.performance_stats)
+				card->perf_stats.tx_csum++;
+		}
 
 	if ((card->info.type == QETH_CARD_TYPE_IQD) && (!large_send) &&
 	    (skb_shinfo(skb)->nr_frags == 0)) {
@@ -2661,12 +2718,13 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	netif_stop_queue(dev);
 
 	/* fix hardware limitation: as long as we do not have sbal
-	 * chaining we can not send long frag lists so we temporary
-	 * switch to EDDP
+	 * chaining we can not send long frag lists
 	 */
 	if ((large_send == QETH_LARGE_SEND_TSO) &&
-		((skb_shinfo(new_skb)->nr_frags + 2) > 16))
-		large_send = QETH_LARGE_SEND_EDDP;
+	    ((skb_shinfo(new_skb)->nr_frags + 2) > 16)) {
+		if (skb_linearize(new_skb))
+			goto tx_drop;
+	}
 
 	if ((large_send == QETH_LARGE_SEND_TSO) &&
 	    (cast_type == RTN_UNSPEC)) {
@@ -2689,40 +2747,22 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		}
 	}
 
-	if (large_send == QETH_LARGE_SEND_EDDP) {
-		/* new_skb is not owned by a socket so we use skb to get
-		 * the protocol
-		 */
-		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 {
-		int elems = qeth_get_elements_no(card, (void *)hdr, new_skb,
+	elems = qeth_get_elements_no(card, (void *)hdr, new_skb,
 						 elements_needed);
-		if (!elems) {
-			if (data_offset >= 0)
-				kmem_cache_free(qeth_core_header_cache, hdr);
-			goto tx_drop;
-		}
-		elements_needed += elems;
-	}
-
-	if ((large_send == QETH_LARGE_SEND_NO) &&
-	    (new_skb->ip_summed == CHECKSUM_PARTIAL)) {
-		qeth_tx_csum(new_skb);
-		if (card->options.performance_stats)
-			card->perf_stats.tx_csum++;
+	if (!elems) {
+		if (data_offset >= 0)
+			kmem_cache_free(qeth_core_header_cache, hdr);
+		goto tx_drop;
 	}
+	elements_needed += elems;
+	nr_frags = skb_shinfo(new_skb)->nr_frags;
 
 	if (card->info.type != QETH_CARD_TYPE_IQD)
 		rc = qeth_do_send_packet(card, queue, new_skb, hdr,
-					 elements_needed, ctx);
+					 elements_needed);
 	else
 		rc = qeth_do_send_packet_fast(card, queue, new_skb, hdr,
-					elements_needed, ctx, data_offset, 0);
+					elements_needed, data_offset, 0);
 
 	if (!rc) {
 		card->stats.tx_packets++;
@@ -2734,22 +2774,13 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 				card->perf_stats.large_send_bytes += tx_bytes;
 				card->perf_stats.large_send_cnt++;
 			}
-			if (skb_shinfo(new_skb)->nr_frags > 0) {
+			if (nr_frags) {
 				card->perf_stats.sg_skbs_sent++;
 				/* nr_frags + skb->data */
-				card->perf_stats.sg_frags_sent +=
-					skb_shinfo(new_skb)->nr_frags + 1;
+				card->perf_stats.sg_frags_sent += 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);
 
@@ -2844,7 +2875,7 @@ static int qeth_l3_ethtool_set_tso(struct net_device *dev, u32 data)
 	if (data) {
 		if (card->options.large_send == QETH_LARGE_SEND_NO) {
 			if (card->info.type == QETH_CARD_TYPE_IQD)
-				card->options.large_send = QETH_LARGE_SEND_EDDP;
+				return -EPERM;
 			else
 				card->options.large_send = QETH_LARGE_SEND_TSO;
 			dev->features |= NETIF_F_TSO;