Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 285 insertions, 0 deletions

diff --git a/drivers/s390/net/qeth_tso.c b/drivers/s390/net/qeth_tso.c
new file mode 100644
index 00000000000..c91976274e7
--- /dev/null
+++ b/drivers/s390/net/qeth_tso.c
@@ -0,0 +1,285 @@
+/*
+ * linux/drivers/s390/net/qeth_tso.c ($Revision: 1.6 $)
+ *
+ * Header file for qeth TCP Segmentation Offload support.
+ *
+ * Copyright 2004 IBM Corporation
+ *
+ *    Author(s): Frank Pavlic <pavlic@de.ibm.com>
+ *
+ *    $Revision: 1.6 $	 $Date: 2005/03/24 09:04:18 $
+ *
+ */
+
+#include <linux/skbuff.h>
+#include <linux/tcp.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <net/ip6_checksum.h>
+#include "qeth.h"
+#include "qeth_mpc.h"
+#include "qeth_tso.h"
+
+/**
+ * skb already partially prepared
+ * classic qdio header in skb->data
+ * */
+static inline struct qeth_hdr_tso *
+qeth_tso_prepare_skb(struct qeth_card *card, struct sk_buff **skb)
+{
+	int rc = 0;
+
+	QETH_DBF_TEXT(trace, 5, "tsoprsk");
+	rc = qeth_realloc_headroom(card, skb,sizeof(struct qeth_hdr_ext_tso));
+	if (rc)
+		return NULL;
+
+	return qeth_push_skb(card, skb, sizeof(struct qeth_hdr_ext_tso));
+}
+
+/**
+ * fill header for a TSO packet
+ */
+static inline void
+qeth_tso_fill_header(struct qeth_card *card, struct sk_buff *skb)
+{
+	struct qeth_hdr_tso *hdr;
+	struct tcphdr *tcph;
+	struct iphdr *iph;
+
+	QETH_DBF_TEXT(trace, 5, "tsofhdr");
+
+	hdr  = (struct qeth_hdr_tso *) skb->data;
+	iph  = skb->nh.iph;
+	tcph = skb->h.th;
+	/*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)->tso_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));
+}
+
+/**
+ * change some header values as requested by hardware
+ */
+static inline void
+qeth_tso_set_tcpip_header(struct qeth_card *card, struct sk_buff *skb)
+{
+	struct iphdr *iph;
+	struct ipv6hdr *ip6h;
+	struct tcphdr *tcph;
+
+	iph  = skb->nh.iph;
+	ip6h = skb->nh.ipv6h;
+	tcph = skb->h.th;
+
+	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);
+		return;
+	}
+	/*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 inline struct qeth_hdr_tso *
+qeth_tso_prepare_packet(struct qeth_card *card, struct sk_buff *skb,
+			int ipv, int cast_type)
+{
+	struct qeth_hdr_tso *hdr;
+	int rc = 0;
+
+	QETH_DBF_TEXT(trace, 5, "tsoprep");
+
+	/*get headroom for tso qdio header */
+	hdr = (struct qeth_hdr_tso *) qeth_tso_prepare_skb(card, &skb);
+	if (hdr == NULL) {
+		QETH_DBF_TEXT_(trace, 4, "2err%d", rc);
+		return NULL;
+	}
+	memset(hdr, 0, sizeof(struct qeth_hdr_tso));
+	/*fill first 32 bytes of  qdio header as used
+	 *FIXME: TSO has two struct members
+	 * with different names but same size
+	 * */
+	qeth_fill_header(card, &hdr->hdr, skb, ipv, cast_type);
+	qeth_tso_fill_header(card, skb);
+	qeth_tso_set_tcpip_header(card, skb);
+	return hdr;
+}
+
+static inline int
+qeth_tso_get_queue_buffer(struct qeth_qdio_out_q *queue)
+{
+	struct qeth_qdio_out_buffer *buffer;
+	int flush_cnt = 0;
+
+	QETH_DBF_TEXT(trace, 5, "tsobuf");
+
+	/* force to non-packing*/
+	if (queue->do_pack)
+		queue->do_pack = 0;
+	buffer = &queue->bufs[queue->next_buf_to_fill];
+	/* get a new buffer if current is already in use*/
+	if ((atomic_read(&buffer->state) == QETH_QDIO_BUF_EMPTY) &&
+	    (buffer->next_element_to_fill > 0)) {
+		atomic_set(&buffer->state, QETH_QDIO_BUF_PRIMED);
+		queue->next_buf_to_fill = (queue->next_buf_to_fill + 1) %
+					  QDIO_MAX_BUFFERS_PER_Q;
+		flush_cnt++;
+	}
+	return flush_cnt;
+}
+
+static inline void
+__qeth_tso_fill_buffer_frag(struct qeth_qdio_out_buffer *buf,
+			  struct sk_buff *skb)
+{
+	struct skb_frag_struct *frag;
+	struct qdio_buffer *buffer;
+	int fragno, cnt, element;
+	unsigned long addr;
+
+        QETH_DBF_TEXT(trace, 6, "tsfilfrg");
+
+	/*initialize variables ...*/
+	fragno = skb_shinfo(skb)->nr_frags;
+	buffer = buf->buffer;
+	element = buf->next_element_to_fill;
+	/*fill buffer elements .....*/
+	for (cnt = 0; cnt < fragno; cnt++) {
+		frag = &skb_shinfo(skb)->frags[cnt];
+		addr = (page_to_pfn(frag->page) << PAGE_SHIFT) +
+			frag->page_offset;
+		buffer->element[element].addr = (char *)addr;
+		buffer->element[element].length = frag->size;
+		if (cnt < (fragno - 1))
+			buffer->element[element].flags =
+				SBAL_FLAGS_MIDDLE_FRAG;
+		else
+			buffer->element[element].flags =
+				SBAL_FLAGS_LAST_FRAG;
+		element++;
+	}
+	buf->next_element_to_fill = element;
+}
+
+static inline int
+qeth_tso_fill_buffer(struct qeth_qdio_out_buffer *buf,
+		     struct sk_buff *skb)
+{
+        int length, length_here, element;
+        int hdr_len;
+	struct qdio_buffer *buffer;
+	struct qeth_hdr_tso *hdr;
+	char *data;
+
+        QETH_DBF_TEXT(trace, 3, "tsfilbuf");
+
+	/*increment user count and queue skb ...*/
+        atomic_inc(&skb->users);
+        skb_queue_tail(&buf->skb_list, skb);
+
+	/*initialize all variables...*/
+        buffer = buf->buffer;
+	hdr = (struct qeth_hdr_tso *)skb->data;
+	hdr_len = sizeof(struct qeth_hdr_tso) + hdr->ext.dg_hdr_len;
+	data = skb->data + hdr_len;
+	length = skb->len - hdr_len;
+        element = buf->next_element_to_fill;
+	/*fill first buffer entry only with header information */
+	buffer->element[element].addr = skb->data;
+	buffer->element[element].length = hdr_len;
+	buffer->element[element].flags = SBAL_FLAGS_FIRST_FRAG;
+	buf->next_element_to_fill++;
+
+	if (skb_shinfo(skb)->nr_frags > 0) {
+                 __qeth_tso_fill_buffer_frag(buf, skb);
+                 goto out;
+        }
+
+       /*start filling buffer entries ...*/
+        element++;
+        while (length > 0) {
+                /* length_here is the remaining amount of data in this page */
+		length_here = PAGE_SIZE - ((unsigned long) data % PAGE_SIZE);
+		if (length < length_here)
+                        length_here = length;
+                buffer->element[element].addr = data;
+                buffer->element[element].length = length_here;
+                length -= length_here;
+                if (!length)
+                        buffer->element[element].flags =
+                                SBAL_FLAGS_LAST_FRAG;
+                 else
+                         buffer->element[element].flags =
+                                 SBAL_FLAGS_MIDDLE_FRAG;
+                data += length_here;
+                element++;
+        }
+        /*set the buffer to primed  ...*/
+        buf->next_element_to_fill = element;
+out:
+	atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED);
+        return 1;
+}
+
+int
+qeth_tso_send_packet(struct qeth_card *card, struct sk_buff *skb,
+		     struct qeth_qdio_out_q *queue, int ipv, int cast_type)
+{
+	int flush_cnt = 0;
+	struct qeth_hdr_tso *hdr;
+	struct qeth_qdio_out_buffer *buffer;
+        int start_index;
+
+	QETH_DBF_TEXT(trace, 3, "tsosend");
+
+	if (!(hdr = qeth_tso_prepare_packet(card, skb, ipv, cast_type)))
+	     	return -ENOMEM;
+	/*check if skb fits in one SBAL ...*/
+	if (!(qeth_get_elements_no(card, (void*)hdr, skb)))
+		return -EINVAL;
+	/*lock queue, force switching to non-packing and send it ...*/
+	while (atomic_compare_and_swap(QETH_OUT_Q_UNLOCKED,
+                                       QETH_OUT_Q_LOCKED,
+                                       &queue->state));
+        start_index = queue->next_buf_to_fill;
+        buffer = &queue->bufs[queue->next_buf_to_fill];
+	/*check if card is too busy ...*/
+	if (atomic_read(&buffer->state) != QETH_QDIO_BUF_EMPTY){
+		card->stats.tx_dropped++;
+		goto out;
+	}
+	/*let's force to non-packing and get a new SBAL*/
+	flush_cnt += qeth_tso_get_queue_buffer(queue);
+	buffer = &queue->bufs[queue->next_buf_to_fill];
+	if (atomic_read(&buffer->state) != QETH_QDIO_BUF_EMPTY) {
+		card->stats.tx_dropped++;
+		goto out;
+	}
+	flush_cnt += qeth_tso_fill_buffer(buffer, skb);
+	queue->next_buf_to_fill = (queue->next_buf_to_fill + 1) %
+				   QDIO_MAX_BUFFERS_PER_Q;
+out:
+	atomic_set(&queue->state, QETH_OUT_Q_UNLOCKED);
+	if (flush_cnt)
+		qeth_flush_buffers(queue, 0, start_index, flush_cnt);
+	/*do some statistics */
+	card->stats.tx_packets++;
+	card->stats.tx_bytes += skb->len;
+	return 0;
+}