Commit 76209926 authored by Hubert WS Lin's avatar Hubert WS Lin Committed by Jeff Garzik
Browse files

[PATCH] pcnet32: set min ring size to 4 



Don Fry reminded me that the pcnet32_loopback_test() asssumes the ring size
is no less than 4.  The minimum ring size was changed to 4 in
pcnet32_set_ringparam() to allow the loopback test to work unchanged.

- Set minimum ring size to 4 to allow loopback test to work unchanged
- Moved variable init_block to first field in struct pcnet32_private

Signed-off-by: default avatarHubert WS Lin <wslin@tw.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarJeff Garzik <jgarzik@pobox.com>
parent eabf0415

drivers/net/pcnet32.c

+12 −7
Original line number Diff line number Diff line
@@ -22,8 +22,8 @@ 
 *************************************************************************/



#define DRV_NAME	"pcnet32"

#define DRV_VERSION	"1.31"

#define DRV_RELDATE	"02.Sep.2005"

#define DRV_VERSION	"1.31a"

#define DRV_RELDATE	"12.Sep.2005"

#define PFX		DRV_NAME ": "



static const char *version =
@@ -258,6 +258,8 @@ static int homepna[MAX_UNITS]; 
 * v1.30i  28 Jun 2004 Don Fry change to use module_param.

 * v1.30j  29 Apr 2005 Don Fry fix skb/map leak with loopback test.

 * v1.31   02 Sep 2005 Hubert WS Lin <wslin@tw.ibm.c0m> added set_ringparam().

 * v1.31a  12 Sep 2005 Hubert WS Lin <wslin@tw.ibm.c0m> set min ring size to 4

 *	   to allow loopback test to work unchanged.

 */
@@ -335,14 +337,14 @@ struct pcnet32_access { 
};



/*

 * The first three fields of pcnet32_private are read by the ethernet device

 * so we allocate the structure should be allocated by pci_alloc_consistent().

 * The first field of pcnet32_private is read by the ethernet device

 * so the structure should be allocated using pci_alloc_consistent().

 */

struct pcnet32_private {

    struct pcnet32_init_block init_block;

    /* The Tx and Rx ring entries must be aligned on 16-byte boundaries in 32bit mode. */

    struct pcnet32_rx_head    *rx_ring;

    struct pcnet32_tx_head    *tx_ring;

    struct pcnet32_init_block init_block;

    dma_addr_t		dma_addr;	/* DMA address of beginning of this

					   object, returned by

					   pci_alloc_consistent */
@@ -648,7 +650,10 @@ static int pcnet32_set_ringparam(struct net_device *dev, struct ethtool_ringpara 
    lp->tx_ring_size = min(ering->tx_pending, (unsigned int) TX_MAX_RING_SIZE);

    lp->rx_ring_size = min(ering->rx_pending, (unsigned int) RX_MAX_RING_SIZE);



    for (i = 0; i <= PCNET32_LOG_MAX_TX_BUFFERS; i++) {

    /* set the minimum ring size to 4, to allow the loopback test to work

     * unchanged.

     */

    for (i = 2; i <= PCNET32_LOG_MAX_TX_BUFFERS; i++) {

	if (lp->tx_ring_size <= (1 << i))

	    break;

    }
@@ -656,7 +661,7 @@ static int pcnet32_set_ringparam(struct net_device *dev, struct ethtool_ringpara 
    lp->tx_mod_mask = lp->tx_ring_size - 1;

    lp->tx_len_bits = (i << 12);



    for (i = 0; i <= PCNET32_LOG_MAX_RX_BUFFERS; i++) {

    for (i = 2; i <= PCNET32_LOG_MAX_RX_BUFFERS; i++) {

	if (lp->rx_ring_size <= (1 << i))

	    break;

    }

CRA Git | Maintained and supported by SUSTech CRA and CCSE