forked from Minki/linux
dm9000: add checksum offload support
Add checksum offload support for DM9000A and DM9000B chips. v2 changes: added a local copy of ip_summed to save IO cycles in dm9000_send_packet v3 changes: trans_start updating is removed. Signed-off-by: Yeasah Pell <yeasah@comrex.com> Signed-off-by: Mike Rapoport <mike@compulab.co.il> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yeasah Pell
David S. Miller
parent
482d804cb4
commit
5dcc60b718
@ -92,6 +92,7 @@ typedef struct board_info {
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u16 tx_pkt_cnt;
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u16 queue_pkt_len;
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u16 queue_start_addr;
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u16 queue_ip_summed;
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u16 dbug_cnt;
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u8 io_mode; /* 0:word, 2:byte */
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u8 phy_addr;
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@ -124,6 +125,10 @@ typedef struct board_info {
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struct mii_if_info mii;
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u32 msg_enable;
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int rx_csum;
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int can_csum;
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int ip_summed;
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} board_info_t;
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/* debug code */
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@ -460,6 +465,40 @@ static int dm9000_nway_reset(struct net_device *dev)
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return mii_nway_restart(&dm->mii);
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}
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static uint32_t dm9000_get_rx_csum(struct net_device *dev)
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{
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board_info_t *dm = to_dm9000_board(dev);
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return dm->rx_csum;
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}
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static int dm9000_set_rx_csum(struct net_device *dev, uint32_t data)
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{
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board_info_t *dm = to_dm9000_board(dev);
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unsigned long flags;
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if (dm->can_csum) {
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dm->rx_csum = data;
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spin_lock_irqsave(&dm->lock, flags);
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iow(dm, DM9000_RCSR, dm->rx_csum ? RCSR_CSUM : 0);
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spin_unlock_irqrestore(&dm->lock, flags);
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return 0;
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}
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return -EOPNOTSUPP;
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}
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static int dm9000_set_tx_csum(struct net_device *dev, uint32_t data)
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{
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board_info_t *dm = to_dm9000_board(dev);
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int ret = -EOPNOTSUPP;
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if (dm->can_csum)
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ret = ethtool_op_set_tx_csum(dev, data);
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return ret;
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}
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static u32 dm9000_get_link(struct net_device *dev)
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{
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board_info_t *dm = to_dm9000_board(dev);
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@ -540,6 +579,10 @@ static const struct ethtool_ops dm9000_ethtool_ops = {
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.get_eeprom_len = dm9000_get_eeprom_len,
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.get_eeprom = dm9000_get_eeprom,
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.set_eeprom = dm9000_set_eeprom,
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.get_rx_csum = dm9000_get_rx_csum,
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.set_rx_csum = dm9000_set_rx_csum,
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.get_tx_csum = ethtool_op_get_tx_csum,
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.set_tx_csum = dm9000_set_tx_csum,
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};
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static void dm9000_show_carrier(board_info_t *db,
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@ -685,6 +728,9 @@ dm9000_init_dm9000(struct net_device *dev)
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/* I/O mode */
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db->io_mode = ior(db, DM9000_ISR) >> 6; /* ISR bit7:6 keeps I/O mode */
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/* Checksum mode */
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dm9000_set_rx_csum(dev, db->rx_csum);
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/* GPIO0 on pre-activate PHY */
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iow(db, DM9000_GPR, 0); /* REG_1F bit0 activate phyxcer */
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iow(db, DM9000_GPCR, GPCR_GEP_CNTL); /* Let GPIO0 output */
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@ -743,6 +789,29 @@ static void dm9000_timeout(struct net_device *dev)
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spin_unlock_irqrestore(&db->lock, flags);
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}
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static void dm9000_send_packet(struct net_device *dev,
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int ip_summed,
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u16 pkt_len)
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{
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board_info_t *dm = to_dm9000_board(dev);
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/* The DM9000 is not smart enough to leave fragmented packets alone. */
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if (dm->ip_summed != ip_summed) {
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if (ip_summed == CHECKSUM_NONE)
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iow(dm, DM9000_TCCR, 0);
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else
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iow(dm, DM9000_TCCR, TCCR_IP | TCCR_UDP | TCCR_TCP);
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dm->ip_summed = ip_summed;
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}
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/* Set TX length to DM9000 */
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iow(dm, DM9000_TXPLL, pkt_len);
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iow(dm, DM9000_TXPLH, pkt_len >> 8);
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/* Issue TX polling command */
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iow(dm, DM9000_TCR, TCR_TXREQ); /* Cleared after TX complete */
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}
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/*
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* Hardware start transmission.
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* Send a packet to media from the upper layer.
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@ -769,17 +838,11 @@ dm9000_start_xmit(struct sk_buff *skb, struct net_device *dev)
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db->tx_pkt_cnt++;
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/* TX control: First packet immediately send, second packet queue */
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if (db->tx_pkt_cnt == 1) {
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/* Set TX length to DM9000 */
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iow(db, DM9000_TXPLL, skb->len);
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iow(db, DM9000_TXPLH, skb->len >> 8);
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/* Issue TX polling command */
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iow(db, DM9000_TCR, TCR_TXREQ); /* Cleared after TX complete */
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dev->trans_start = jiffies; /* save the time stamp */
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dm9000_send_packet(dev, skb->ip_summed, skb->len);
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} else {
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/* Second packet */
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db->queue_pkt_len = skb->len;
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db->queue_ip_summed = skb->ip_summed;
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netif_stop_queue(dev);
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}
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@ -809,12 +872,9 @@ static void dm9000_tx_done(struct net_device *dev, board_info_t *db)
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dev_dbg(db->dev, "tx done, NSR %02x\n", tx_status);
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/* Queue packet check & send */
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if (db->tx_pkt_cnt > 0) {
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iow(db, DM9000_TXPLL, db->queue_pkt_len);
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iow(db, DM9000_TXPLH, db->queue_pkt_len >> 8);
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iow(db, DM9000_TCR, TCR_TXREQ);
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dev->trans_start = jiffies;
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}
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if (db->tx_pkt_cnt > 0)
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dm9000_send_packet(dev, db->queue_ip_summed,
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db->queue_pkt_len);
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netif_wake_queue(dev);
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}
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}
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@ -846,14 +906,14 @@ dm9000_rx(struct net_device *dev)
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rxbyte = readb(db->io_data);
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/* Status check: this byte must be 0 or 1 */
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if (rxbyte > DM9000_PKT_RDY) {
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if (rxbyte & DM9000_PKT_ERR) {
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dev_warn(db->dev, "status check fail: %d\n", rxbyte);
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iow(db, DM9000_RCR, 0x00); /* Stop Device */
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iow(db, DM9000_ISR, IMR_PAR); /* Stop INT request */
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return;
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}
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if (rxbyte != DM9000_PKT_RDY)
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if (!(rxbyte & DM9000_PKT_RDY))
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return;
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/* A packet ready now & Get status/length */
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@ -914,6 +974,12 @@ dm9000_rx(struct net_device *dev)
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/* Pass to upper layer */
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skb->protocol = eth_type_trans(skb, dev);
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if (db->rx_csum) {
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if ((((rxbyte & 0x1c) << 3) & rxbyte) == 0)
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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else
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skb->ip_summed = CHECKSUM_NONE;
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}
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netif_rx(skb);
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dev->stats.rx_packets++;
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@ -922,7 +988,7 @@ dm9000_rx(struct net_device *dev)
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(db->dumpblk)(db->io_data, RxLen);
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}
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} while (rxbyte == DM9000_PKT_RDY);
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} while (rxbyte & DM9000_PKT_RDY);
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}
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static irqreturn_t dm9000_interrupt(int irq, void *dev_id)
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@ -1349,6 +1415,13 @@ dm9000_probe(struct platform_device *pdev)
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db->type = TYPE_DM9000E;
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}
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/* dm9000a/b are capable of hardware checksum offload */
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if (db->type == TYPE_DM9000A || db->type == TYPE_DM9000B) {
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db->can_csum = 1;
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db->rx_csum = 1;
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ndev->features |= NETIF_F_IP_CSUM;
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}
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/* from this point we assume that we have found a DM9000 */
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/* driver system function */
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@ -45,6 +45,10 @@
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#define DM9000_CHIPR 0x2C
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#define DM9000_SMCR 0x2F
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#define DM9000_ETXCSR 0x30
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#define DM9000_TCCR 0x31
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#define DM9000_RCSR 0x32
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#define CHIPR_DM9000A 0x19
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#define CHIPR_DM9000B 0x1B
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@ -131,7 +135,21 @@
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#define GPCR_GEP_CNTL (1<<0)
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#define TCCR_IP (1<<0)
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#define TCCR_TCP (1<<1)
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#define TCCR_UDP (1<<2)
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#define RCSR_UDP_BAD (1<<7)
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#define RCSR_TCP_BAD (1<<6)
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#define RCSR_IP_BAD (1<<5)
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#define RCSR_UDP (1<<4)
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#define RCSR_TCP (1<<3)
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#define RCSR_IP (1<<2)
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#define RCSR_CSUM (1<<1)
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#define RCSR_DISCARD (1<<0)
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#define DM9000_PKT_RDY 0x01 /* Packet ready to receive */
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#define DM9000_PKT_ERR 0x02
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#define DM9000_PKT_MAX 1536 /* Received packet max size */
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/* DM9000A / DM9000B definitions */
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