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cxgb3 - Stop mac RX when changing MTU

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Rx traffic needs to be halted when the MTU is changed
to avoid a potential chip hang.
Reset/restore MAC filters around a MTU change.
Also fix the pause frames high materwark setting.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Divy Le Ray 2007-05-30 10:01:44 -07:00 committed by Jeff Garzik
parent c706bfb52a
commit 7b581a0fa8
2 changed files with 70 additions and 1 deletions
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4
drivers/net/cxgb3/regs.h
View file

@ -1882,6 +1882,10 @@
#define V_COPYALLFRAMES(x) ((x) << S_COPYALLFRAMES)
#define F_COPYALLFRAMES V_COPYALLFRAMES(1U)
#define S_DISBCAST 1
#define V_DISBCAST(x) ((x) << S_DISBCAST)
#define F_DISBCAST V_DISBCAST(1U)
#define A_XGM_RX_HASH_LOW 0x814
#define A_XGM_RX_HASH_HIGH 0x818

67
drivers/net/cxgb3/xgmac.c
View file

@ -231,6 +231,28 @@ int t3_mac_set_num_ucast(struct cmac *mac, int n)
return 0;
}
static void disable_exact_filters(struct cmac *mac)
{
unsigned int i, reg = mac->offset + A_XGM_RX_EXACT_MATCH_LOW_1;
for (i = 0; i < EXACT_ADDR_FILTERS; i++, reg += 8) {
u32 v = t3_read_reg(mac->adapter, reg);
t3_write_reg(mac->adapter, reg, v);
}
t3_read_reg(mac->adapter, A_XGM_RX_EXACT_MATCH_LOW_1); /* flush */
}
static void enable_exact_filters(struct cmac *mac)
{
unsigned int i, reg = mac->offset + A_XGM_RX_EXACT_MATCH_HIGH_1;
for (i = 0; i < EXACT_ADDR_FILTERS; i++, reg += 8) {
u32 v = t3_read_reg(mac->adapter, reg);
t3_write_reg(mac->adapter, reg, v);
}
t3_read_reg(mac->adapter, A_XGM_RX_EXACT_MATCH_LOW_1); /* flush */
}
/* Calculate the RX hash filter index of an Ethernet address */
static int hash_hw_addr(const u8 * addr)
{
@ -281,6 +303,14 @@ int t3_mac_set_rx_mode(struct cmac *mac, struct t3_rx_mode *rm)
return 0;
}
static int rx_fifo_hwm(int mtu)
{
int hwm;
hwm = max(MAC_RXFIFO_SIZE - 3 * mtu, (MAC_RXFIFO_SIZE * 38) / 100);
return min(hwm, MAC_RXFIFO_SIZE - 8192);
}
int t3_mac_set_mtu(struct cmac *mac, unsigned int mtu)
{
int hwm, lwm;
@ -306,11 +336,38 @@ int t3_mac_set_mtu(struct cmac *mac, unsigned int mtu)
lwm = min(3 * (int)mtu, MAC_RXFIFO_SIZE / 4);
v = t3_read_reg(adap, A_XGM_RXFIFO_CFG + mac->offset);
if (adap->params.rev == T3_REV_B2 &&
(t3_read_reg(adap, A_XGM_RX_CTRL + mac->offset) & F_RXEN)) {
disable_exact_filters(mac);
t3_set_reg_field(adap, A_XGM_RXFIFO_CFG + mac->offset,
F_ENHASHMCAST | F_COPYALLFRAMES, F_DISBCAST);
/* drain rx FIFO */
if (t3_wait_op_done(adap,
A_XGM_RX_MAX_PKT_SIZE_ERR_CNT +
mac->offset,
1 << 31, 1, 20, 5)) {
t3_write_reg(adap, A_XGM_RXFIFO_CFG + mac->offset, v);
enable_exact_filters(mac);
return -EIO;
}
t3_write_reg(adap, A_XGM_RX_MAX_PKT_SIZE + mac->offset, mtu);
enable_exact_filters(mac);
} else
t3_write_reg(adap, A_XGM_RX_MAX_PKT_SIZE + mac->offset, mtu);
/*
* Adjust the PAUSE frame watermarks. We always set the LWM, and the
* HWM only if flow-control is enabled.
*/
hwm = rx_fifo_hwm(mtu);
lwm = min(3 * (int)mtu, MAC_RXFIFO_SIZE / 4);
v &= ~V_RXFIFOPAUSELWM(M_RXFIFOPAUSELWM);
v |= V_RXFIFOPAUSELWM(lwm / 8);
if (G_RXFIFOPAUSEHWM(v))
v = (v & ~V_RXFIFOPAUSEHWM(M_RXFIFOPAUSEHWM)) |
V_RXFIFOPAUSEHWM(hwm / 8);
t3_write_reg(adap, A_XGM_RXFIFO_CFG + mac->offset, v);
/* Adjust the TX FIFO threshold based on the MTU */
@ -329,7 +386,6 @@ int t3_mac_set_mtu(struct cmac *mac, unsigned int mtu)
(hwm - lwm) * 4 / 8);
t3_write_reg(adap, A_XGM_TX_PAUSE_QUANTA + mac->offset,
MAC_RXFIFO_SIZE * 4 * 8 / 512);
return 0;
}
@ -357,6 +413,15 @@ int t3_mac_set_speed_duplex_fc(struct cmac *mac, int speed, int duplex, int fc)
V_PORTSPEED(M_PORTSPEED), val);
}
val = t3_read_reg(adap, A_XGM_RXFIFO_CFG + oft);
val &= ~V_RXFIFOPAUSEHWM(M_RXFIFOPAUSEHWM);
if (fc & PAUSE_TX)
val |= V_RXFIFOPAUSEHWM(rx_fifo_hwm(
t3_read_reg(adap,
A_XGM_RX_MAX_PKT_SIZE
+ oft)) / 8);
t3_write_reg(adap, A_XGM_RXFIFO_CFG + oft, val);
t3_set_reg_field(adap, A_XGM_TX_CFG + oft, F_TXPAUSEEN,
(fc & PAUSE_RX) ? F_TXPAUSEEN : 0);
return 0;