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Commit 70f1be48 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Francois Romieu
Browse files

sky2: truncate oversize packets 



Turn on truncation to prevent getting choked by frames larger than expected.
Without this fix, driver hangs after receiving an oversize packet.

Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
parent b19666d9

drivers/net/sky2.c

+11 −5
Original line number Diff line number Diff line
@@ -622,8 +622,8 @@ static void sky2_mac_init(struct sky2_hw *hw, unsigned port) 


	/* Configure Rx MAC FIFO */

	sky2_write8(hw, SK_REG(port, RX_GMF_CTRL_T), GMF_RST_CLR);

	sky2_write16(hw, SK_REG(port, RX_GMF_CTRL_T),

		     GMF_RX_CTRL_DEF);

	sky2_write32(hw, SK_REG(port, RX_GMF_CTRL_T),

		     GMF_OPER_ON | GMF_RX_F_FL_ON);



	/* Flush Rx MAC FIFO on any flow control or error */

	sky2_write16(hw, SK_REG(port, RX_GMF_FL_MSK), GMR_FS_ANY_ERR);
@@ -995,6 +995,10 @@ static int sky2_rx_start(struct sky2_port *sky2) 
		sky2_rx_add(sky2, re->mapaddr);

	}



 	/* Truncate oversize frames */

 	sky2_write16(hw, SK_REG(sky2->port, RX_GMF_TR_THR), sky2->rx_bufsize - 8);

 	sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_TRUNC_ON);



	/* Tell chip about available buffers */

	sky2_write16(hw, Y2_QADDR(rxq, PREF_UNIT_PUT_IDX), sky2->rx_put);

	sky2->rx_last_put = sky2_read16(hw, Y2_QADDR(rxq, PREF_UNIT_PUT_IDX));
@@ -1712,10 +1716,12 @@ static void sky2_tx_timeout(struct net_device *dev) 




#define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))

/* Want receive buffer size to be multiple of 64 bits, and incl room for vlan */

/* Want receive buffer size to be multiple of 64 bits

 * and incl room for vlan and truncation

 */

static inline unsigned sky2_buf_size(int mtu)

{

	return roundup(mtu + ETH_HLEN + 4, 8);

	return roundup(mtu + ETH_HLEN + VLAN_HLEN, 8) + 8;

}



static int sky2_change_mtu(struct net_device *dev, int new_mtu)
@@ -1798,7 +1804,7 @@ static struct sk_buff *sky2_receive(struct sky2_port *sky2, 
	if (!(status & GMR_FS_RX_OK))

		goto resubmit;



	if ((status >> 16) != length || length > sky2->rx_bufsize)

	if (length > sky2->netdev->mtu + ETH_HLEN)

		goto oversize;



	if (length < copybreak) {