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Commit fe6d3a40 authored by Masakazu Mokuno's avatar Masakazu Mokuno Committed by Jeff Garzik
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ps3: reduce allocation size of rx skb buffers 



Reduced allocation size for rx skb buffers, from 2308 bytes to
1356 per buffer.

Signed-off-by: default avatarMasakazu Mokuno <mokuno@sm.sony.co.jp>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent a3093d9b

drivers/net/ps3_gelic_net.c

+37 −8
Original line number Diff line number Diff line
@@ -917,31 +917,60 @@ static int gelic_net_decode_one_descr(struct gelic_net_card *card) 
		goto refill;

	}



	if ((status != GELIC_NET_DESCR_COMPLETE) &&

	    (status != GELIC_NET_DESCR_FRAME_END)) {

	if (status == GELIC_NET_DESCR_BUFFER_FULL) {

		/*

		 * Buffer full would occur if and only if

		 * the frame length was longer than the size of this

		 * descriptor's buffer.  If the frame length was equal

		 * to or shorter than buffer'size, FRAME_END condition

		 * would occur.

		 * Anyway this frame was longer than the MTU,

		 * just drop it.

		 */

		dev_info(ctodev(card), "overlength frame\n");

		goto refill;

	}

	/*

	 * descriptoers any other than FRAME_END here should

	 * be treated as error.

	 */

	if (status != GELIC_NET_DESCR_FRAME_END) {

		dev_dbg(ctodev(card), "RX descriptor with state %x\n",

			status);

		goto refill;

	}



	/* ok, we've got a packet in descr */

	gelic_net_pass_skb_up(descr, card); /* 1: skb_up sccess */



	gelic_net_pass_skb_up(descr, card);

refill:

	descr->next_descr_addr = 0; /* unlink the descr */

	/*

	 * So that always DMAC can see the end

	 * of the descriptor chain to avoid

	 * from unwanted DMAC overrun.

	 */

	descr->next_descr_addr = 0;



	/* change the descriptor state: */

	gelic_net_set_descr_status(descr, GELIC_NET_DESCR_NOT_IN_USE);



	/* refill one desc

	 * FIXME: this can fail, but for now, just leave this

	 * descriptor without skb

	/*

	 * this call can fail, but for now, just leave this

	 * decriptor without skb

	 */

	gelic_net_prepare_rx_descr(card, descr);



	chain->head = descr;

	chain->tail = descr->next;



	/*

	 * Set this descriptor the end of the chain.

	 */

	descr->prev->next_descr_addr = descr->bus_addr;



	/*

	 * If dmac chain was met, DMAC stopped.

	 * thus re-enable it

	 */

	if (dmac_chain_ended) {

		card->rx_dma_restart_required = 1;

		dev_dbg(ctodev(card), "reenable rx dma scheduled\n");

drivers/net/ps3_gelic_net.h

+7 −5
Original line number Diff line number Diff line
@@ -32,8 +32,8 @@ 
#define GELIC_NET_RX_DESCRIPTORS        128 /* num of descriptors */

#define GELIC_NET_TX_DESCRIPTORS        128 /* num of descriptors */



#define GELIC_NET_MAX_MTU               2308

#define GELIC_NET_MIN_MTU               64

#define GELIC_NET_MAX_MTU               VLAN_ETH_FRAME_LEN

#define GELIC_NET_MIN_MTU               VLAN_ETH_ZLEN

#define GELIC_NET_RXBUF_ALIGN           128

#define GELIC_NET_RX_CSUM_DEFAULT       1 /* hw chksum */

#define GELIC_NET_WATCHDOG_TIMEOUT      5*HZ
@@ -81,7 +81,8 @@ enum gelic_net_int1_status { 
					    */

#define GELIC_NET_RXVLNPKT	0x00200000 /* VLAN packet */

/* bit 20..16 reserved */

#define GELIC_NET_RXRECNUM	0x0000ff00 /* reception receipt number */

#define GELIC_NET_RXRRECNUM	0x0000ff00 /* reception receipt number */

#define GELIC_NET_RXRRECNUM_SHIFT	8

/* bit 7..0 reserved */



#define GELIC_NET_TXDESC_TAIL		0
@@ -129,13 +130,14 @@ enum gelic_net_int1_status { 




enum gelic_net_descr_status {

	GELIC_NET_DESCR_COMPLETE            = 0x00, /* used in rx and tx */

	GELIC_NET_DESCR_COMPLETE            = 0x00, /* used in tx */

	GELIC_NET_DESCR_BUFFER_FULL         = 0x00, /* used in rx */

	GELIC_NET_DESCR_RESPONSE_ERROR      = 0x01, /* used in rx and tx */

	GELIC_NET_DESCR_PROTECTION_ERROR    = 0x02, /* used in rx and tx */

	GELIC_NET_DESCR_FRAME_END           = 0x04, /* used in rx */

	GELIC_NET_DESCR_FORCE_END           = 0x05, /* used in rx and tx */

	GELIC_NET_DESCR_CARDOWNED           = 0x0a, /* used in rx and tx */

	GELIC_NET_DESCR_NOT_IN_USE                  /* any other value */

	GELIC_NET_DESCR_NOT_IN_USE          = 0x0b  /* any other value */

};

/* for lv1_net_control */

#define GELIC_NET_GET_MAC_ADDRESS               0x0000000000000001