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net/sonic: Remove redundant next_tx variable 

The eol_tx variable is the one that matters to the tx algorithm because
packets are always placed at the end of the list. The next_tx variable
just confuses things so remove it.

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Finn Thain 2020-02-16 08:03:32 +11:00 committed by David S. Miller
parent 5d58c21c10
commit 29660d50a9
2 changed files with 4 additions and 5 deletions
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8
drivers/net/ethernet/natsemi/sonic.c
View File

@ -300,7 +300,7 @@ static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
spin_lock_irqsave(&lp->lock, flags);
entry = lp->next_tx;
entry = (lp->eol_tx + 1) & SONIC_TDS_MASK;
sonic_tda_put(dev, entry, SONIC_TD_STATUS, 0); /* clear status */
sonic_tda_put(dev, entry, SONIC_TD_FRAG_COUNT, 1); /* single fragment */
@ -321,8 +321,8 @@ static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
sonic_tda_get(dev, lp->eol_tx, SONIC_TD_LINK) & ~SONIC_EOL);
lp->eol_tx = entry;
lp->next_tx = (entry + 1) & SONIC_TDS_MASK;
if (lp->tx_skb[lp->next_tx] != NULL) {
entry = (entry + 1) & SONIC_TDS_MASK;
if (lp->tx_skb[entry]) {
/* The ring is full, the ISR has yet to process the next TD. */
netif_dbg(lp, tx_queued, dev, "%s: stopping queue\n", __func__);
netif_stop_queue(dev);
@ -811,7 +811,7 @@ static int sonic_init(struct net_device *dev)
SONIC_WRITE(SONIC_UTDA, lp->tda_laddr >> 16);
SONIC_WRITE(SONIC_CTDA, lp->tda_laddr & 0xffff);
lp->cur_tx = lp->next_tx = 0;
lp->cur_tx = 0;
lp->eol_tx = SONIC_NUM_TDS - 1;
/*

1
drivers/net/ethernet/natsemi/sonic.h
View File

@ -321,7 +321,6 @@ struct sonic_local {
unsigned int cur_tx; /* first unacked transmit packet */
unsigned int eol_rx;
unsigned int eol_tx; /* last unacked transmit packet */
unsigned int next_tx; /* next free TD */
int msg_enable;
struct device *device; /* generic device */
struct net_device_stats stats;