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Bug fix from Chelsio which addresses the issue of the device resetting

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when it sees only received packets.  In some cases where a device only
recieves data it mistakenly thinks that its transmitting side is broken
and resets the device.

Obtained from:	Chelsio Inc.
MFC after:	3 days
This commit is contained in:
George V. Neville-Neil 2008-12-02 15:42:47 +00:00
parent 41fbf4374b
commit c9c0c99f30
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=185564
1 changed files with 2 additions and 25 deletions
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27
sys/dev/cxgb/common/cxgb_xgmac.c
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@ -633,20 +633,15 @@ int t3b2_mac_watchdog_task(struct cmac *mac)
adapter_t *adap = mac->adapter;
struct mac_stats *s = &mac->stats;
unsigned int tx_mcnt = (unsigned int)s->tx_frames;
unsigned int rx_mcnt = (unsigned int)s->rx_frames;
unsigned int rx_xcnt;
if (mac->multiport) {
tx_mcnt = t3_read_reg(adap, A_XGM_STAT_TX_FRAME_LOW);
rx_mcnt = t3_read_reg(adap, A_XGM_STAT_RX_FRAMES_LOW);
} else {
tx_mcnt = (unsigned int)s->tx_frames;
rx_mcnt = (unsigned int)s->rx_frames;
}
status = 0;
tx_xcnt = 1; /* By default tx_xcnt is making progress*/
tx_tcnt = mac->tx_tcnt; /* If tx_mcnt is progressing ignore tx_tcnt*/
rx_xcnt = 1; /* By default rx_xcnt is making progress*/
if (tx_mcnt == mac->tx_mcnt && mac->rx_pause == s->rx_pause) {
tx_xcnt = (G_TXSPI4SOPCNT(t3_read_reg(adap,
A_XGM_TX_SPI4_SOP_EOP_CNT +
@ -657,11 +652,11 @@ int t3b2_mac_watchdog_task(struct cmac *mac)
tx_tcnt = (G_TXDROPCNTCH0RCVD(t3_read_reg(adap,
A_TP_PIO_DATA)));
} else {
goto rxcheck;
goto out;
}
} else {
mac->toggle_cnt = 0;
goto rxcheck;
goto out;
}
if ((tx_tcnt != mac->tx_tcnt) && (mac->tx_xcnt == 0)) {
@ -674,22 +669,6 @@ int t3b2_mac_watchdog_task(struct cmac *mac)
}
} else {
mac->toggle_cnt = 0;
goto rxcheck;
}
rxcheck:
if (rx_mcnt != mac->rx_mcnt) {
rx_xcnt = (G_TXSPI4SOPCNT(t3_read_reg(adap,
A_XGM_RX_SPI4_SOP_EOP_CNT +
mac->offset))) +
(s->rx_fifo_ovfl - mac->rx_ocnt);
mac->rx_ocnt = s->rx_fifo_ovfl;
} else
goto out;
if (mac->rx_mcnt != s->rx_frames && rx_xcnt == 0 && mac->rx_xcnt == 0) {
if (!mac->multiport)
status = 2;
goto out;
}
@ -697,8 +676,6 @@ out:
mac->tx_tcnt = tx_tcnt;
mac->tx_xcnt = tx_xcnt;
mac->tx_mcnt = s->tx_frames;
mac->rx_xcnt = rx_xcnt;
mac->rx_mcnt = s->rx_frames;
mac->rx_pause = s->rx_pause;
if (status == 1) {
t3_write_reg(adap, A_XGM_TX_CTRL + mac->offset, 0);