Commit d801145d authored by Frank Pavlic's avatar Frank Pavlic Committed by Jeff Garzik
Browse files

[PATCH] s390: qeth bug fixes 



[patch 7/10] s390: qeth bug fixes.

From: Frank Pavlic <pavlic@de.ibm.com>

qeth network driver changes:
 - Removed redundant code, use the same qeth_fill_buffer_frag
   for TSO path either
 - Using skb->frags solely is not correct since skb->data still
   points to the beginning of the whole data, even when it is
   a small portion we have to fill the qdio buffer with it.

Signed-off-by: default avatarFrank Pavlic <pavlic@de.ibm.com>
parent 5e39f293

drivers/s390/net/qeth.h

+12 −1
Original line number Diff line number Diff line
@@ -24,7 +24,7 @@ 


#include "qeth_mpc.h"



#define VERSION_QETH_H 		"$Revision: 1.135 $"

#define VERSION_QETH_H 		"$Revision: 1.136 $"



#ifdef CONFIG_QETH_IPV6

#define QETH_VERSION_IPV6 	":IPv6"
@@ -866,6 +866,17 @@ qeth_push_skb(struct qeth_card *card, struct sk_buff **skb, int size) 
        return hdr;

}



static inline int

qeth_get_skb_data_len(struct sk_buff *skb)

{

	int len = skb->len;

	int i;



	for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i)

		len -= skb_shinfo(skb)->frags[i].size;

	return len;

}



inline static int

qeth_get_hlen(__u8 link_type)

{

drivers/s390/net/qeth_eddp.c

+2 −13
Original line number Diff line number Diff line 
/*

 *

 * linux/drivers/s390/net/qeth_eddp.c ($Revision: 1.11 $)

 * linux/drivers/s390/net/qeth_eddp.c ($Revision: 1.12 $)

 *

 * Enhanced Device Driver Packing (EDDP) support for the qeth driver.

 *
@@ -8,7 +8,7 @@ 
 *

 *    Author(s): Thomas Spatzier <tspat@de.ibm.com>

 *

 *    $Revision: 1.11 $	 $Date: 2005/03/24 09:04:18 $

 *    $Revision: 1.12 $	 $Date: 2005/04/01 21:40:40 $

 *

 */

#include <linux/config.h>
@@ -202,17 +202,6 @@ out: 
	return flush_cnt;

}



static inline int

qeth_get_skb_data_len(struct sk_buff *skb)

{

	int len = skb->len;

	int i;



	for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i)

		len -= skb_shinfo(skb)->frags[i].size;

	return len;

}



static inline void

qeth_eddp_create_segment_hdrs(struct qeth_eddp_context *ctx,

			      struct qeth_eddp_data *eddp)

drivers/s390/net/qeth_main.c

+4 −45
Original line number Diff line number Diff line 
/*

 *

 * linux/drivers/s390/net/qeth_main.c ($Revision: 1.206 $)

 * linux/drivers/s390/net/qeth_main.c ($Revision: 1.207 $)

 *

 * Linux on zSeries OSA Express and HiperSockets support

 *
@@ -12,7 +12,7 @@ 
 *			  Frank Pavlic (pavlic@de.ibm.com) and

 *		 	  Thomas Spatzier <tspat@de.ibm.com>

 *

 *    $Revision: 1.206 $	 $Date: 2005/03/24 09:04:18 $

 *    $Revision: 1.207 $	 $Date: 2005/04/01 21:40:40 $

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by
@@ -80,7 +80,7 @@ qeth_eyecatcher(void) 
#include "qeth_eddp.h"

#include "qeth_tso.h"



#define VERSION_QETH_C "$Revision: 1.206 $"

#define VERSION_QETH_C "$Revision: 1.207 $"

static const char *version = "qeth S/390 OSA-Express driver";



/**
@@ -3893,47 +3893,6 @@ qeth_fill_header(struct qeth_card *card, struct qeth_hdr *hdr, 
	}

}



static inline void

__qeth_fill_buffer_frag(struct sk_buff *skb, struct qdio_buffer *buffer,

			int *next_element_to_fill)

{

	int length = skb->len;

	struct skb_frag_struct *frag;

	int fragno;

	unsigned long addr;

	int element;

	int first_lap = 1;



	fragno = skb_shinfo(skb)->nr_frags; /* start with last frag */

	element = *next_element_to_fill + fragno;

	while (length > 0) {

		if (fragno > 0) {

			frag = &skb_shinfo(skb)->frags[fragno - 1];

			addr = (page_to_pfn(frag->page) << PAGE_SHIFT) +

				frag->page_offset;

			buffer->element[element].addr = (char *)addr;

			buffer->element[element].length = frag->size;

			length -= frag->size;

			if (first_lap)

				buffer->element[element].flags =

				    SBAL_FLAGS_LAST_FRAG;

			else

				buffer->element[element].flags =

				    SBAL_FLAGS_MIDDLE_FRAG;

		} else {

			buffer->element[element].addr = skb->data;

			buffer->element[element].length = length;

			length = 0;

			buffer->element[element].flags =

				SBAL_FLAGS_FIRST_FRAG;

		}

		element--;

		fragno--;

		first_lap = 0;

	}

	*next_element_to_fill += skb_shinfo(skb)->nr_frags + 1;

}



static inline void

__qeth_fill_buffer(struct sk_buff *skb, struct qdio_buffer *buffer,

		   int *next_element_to_fill)
@@ -3991,7 +3950,7 @@ qeth_fill_buffer(struct qeth_qdio_out_q *queue, 
		__qeth_fill_buffer(skb, buffer,

				   (int *)&buf->next_element_to_fill);

	else

		__qeth_fill_buffer_frag(skb, buffer,

		__qeth_fill_buffer_frag(skb, buffer, 0,

					(int *)&buf->next_element_to_fill);



	if (!queue->do_pack) {

drivers/s390/net/qeth_tso.c

+10 −39
Original line number Diff line number Diff line 
/*

 * linux/drivers/s390/net/qeth_tso.c ($Revision: 1.6 $)

 * linux/drivers/s390/net/qeth_tso.c ($Revision: 1.7 $)

 *

 * Header file for qeth TCP Segmentation Offload support.

 *
@@ -7,7 +7,7 @@ 
 *

 *    Author(s): Frank Pavlic <pavlic@de.ibm.com>

 *

 *    $Revision: 1.6 $	 $Date: 2005/03/24 09:04:18 $

 *    $Revision: 1.7 $	 $Date: 2005/04/01 21:40:41 $

 *

 */
@@ -144,38 +144,6 @@ qeth_tso_get_queue_buffer(struct qeth_qdio_out_q *queue) 
	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,
@@ -205,13 +173,16 @@ qeth_tso_fill_buffer(struct qeth_qdio_out_buffer *buf, 
	buffer->element[element].length = hdr_len;

	buffer->element[element].flags = SBAL_FLAGS_FIRST_FRAG;

	buf->next_element_to_fill++;



	/*check if we have frags ...*/

	if (skb_shinfo(skb)->nr_frags > 0) {

                 __qeth_tso_fill_buffer_frag(buf, skb);

		skb->len = length;

		skb->data = data;

                 __qeth_fill_buffer_frag(skb, buffer,1,

					(int *)&buf->next_element_to_fill);

                 goto out;

        }



       /*start filling buffer entries ...*/

       /*... if not, use this */

        element++;

        while (length > 0) {

                /* length_here is the remaining amount of data in this page */
@@ -230,9 +201,9 @@ qeth_tso_fill_buffer(struct qeth_qdio_out_buffer *buf, 
                data += length_here;

                element++;

        }

        /*set the buffer to primed  ...*/

        buf->next_element_to_fill = element;

out:

        /*prime buffer now  ...*/

	atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED);

        return 1;

}

drivers/s390/net/qeth_tso.h

+58 −13
Original line number Diff line number Diff line 
/*

 * linux/drivers/s390/net/qeth_tso.h ($Revision: 1.4 $)

 * linux/drivers/s390/net/qeth_tso.h ($Revision: 1.5 $)

 *

 * Header file for qeth TCP Segmentation Offload support.

 *
@@ -7,7 +7,7 @@ 
 *

 *    Author(s): Frank Pavlic <pavlic@de.ibm.com>

 *

 *    $Revision: 1.4 $	 $Date: 2005/03/24 09:04:18 $

 *    $Revision: 1.5 $	 $Date: 2005/04/01 21:40:41 $

 *

 */

#ifndef __QETH_TSO_H__
@@ -37,7 +37,6 @@ struct qeth_hdr_tso { 
} __attribute__ ((packed));



/*some helper functions*/



static inline int

qeth_get_elements_no(struct qeth_card *card, void *hdr, struct sk_buff *skb)

{
@@ -55,4 +54,50 @@ qeth_get_elements_no(struct qeth_card *card, void *hdr, struct sk_buff *skb) 
        }

        return elements_needed;

}



static inline void

__qeth_fill_buffer_frag(struct sk_buff *skb, struct qdio_buffer *buffer,

			int is_tso, int *next_element_to_fill)

{

	int length = skb->len;

	struct skb_frag_struct *frag;

	int fragno;

	unsigned long addr;

	int element;

	int first_lap = 1;



	fragno = skb_shinfo(skb)->nr_frags; /* start with last frag */

	element = *next_element_to_fill + fragno;

	while (length > 0) {

		if (fragno > 0) {

			frag = &skb_shinfo(skb)->frags[fragno - 1];

			addr = (page_to_pfn(frag->page) << PAGE_SHIFT) +

				frag->page_offset;

			buffer->element[element].addr = (char *)addr;

			buffer->element[element].length = frag->size;

			length -= frag->size;

			if (first_lap)

				buffer->element[element].flags =

				    SBAL_FLAGS_LAST_FRAG;

			else

				buffer->element[element].flags =

				    SBAL_FLAGS_MIDDLE_FRAG;

		} else {

			buffer->element[element].addr = skb->data;

			buffer->element[element].length = length;

			length = 0;

			if (is_tso)

				buffer->element[element].flags =

					SBAL_FLAGS_MIDDLE_FRAG;

			else

				buffer->element[element].flags =

					SBAL_FLAGS_FIRST_FRAG;

		}

		element--;

		fragno--;

		first_lap = 0;

	}

	*next_element_to_fill += skb_shinfo(skb)->nr_frags + 1;

}



#endif /* __QETH_TSO_H__ */

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