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cnic: Return SPQ credit to bnx2x after ring setup and shutdown.

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Everytime the iSCSI ring finishes setup or shutdown, we need to return
the SPQ (slow path queue) credit to the bnx2x driver.  Without this step,
the SPQ will eventually be full causing iSCSI to fail.  This can happen
after 3 or 4 MTU changes for example.

Add code to wait for these slow path commands to complete in the RX ring
and return the SPQ credit to bnx2x.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2010-05-18 11:32:53 +00:00 committed by David S. Miller
parent 1f1332a3cb
commit 48f753d2ba
2 changed files with 75 additions and 1 deletions
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71
drivers/net/cnic.c
View File

@ -2145,17 +2145,56 @@ static int cnic_get_kcqes(struct cnic_dev *dev, u16 hw_prod, u16 *sw_prod)
return last_cnt;
}
static int cnic_l2_completion(struct cnic_local *cp)
{
u16 hw_cons, sw_cons;
union eth_rx_cqe *cqe, *cqe_ring = (union eth_rx_cqe *)
(cp->l2_ring + (2 * BCM_PAGE_SIZE));
u32 cmd;
int comp = 0;
if (!test_bit(CNIC_F_BNX2X_CLASS, &cp->dev->flags))
return 0;
hw_cons = *cp->rx_cons_ptr;
if ((hw_cons & BNX2X_MAX_RCQ_DESC_CNT) == BNX2X_MAX_RCQ_DESC_CNT)
hw_cons++;
sw_cons = cp->rx_cons;
while (sw_cons != hw_cons) {
u8 cqe_fp_flags;
cqe = &cqe_ring[sw_cons & BNX2X_MAX_RCQ_DESC_CNT];
cqe_fp_flags = cqe->fast_path_cqe.type_error_flags;
if (cqe_fp_flags & ETH_FAST_PATH_RX_CQE_TYPE) {
cmd = le32_to_cpu(cqe->ramrod_cqe.conn_and_cmd_data);
cmd >>= COMMON_RAMROD_ETH_RX_CQE_CMD_ID_SHIFT;
if (cmd == RAMROD_CMD_ID_ETH_CLIENT_SETUP ||
cmd == RAMROD_CMD_ID_ETH_HALT)
comp++;
}
sw_cons = BNX2X_NEXT_RCQE(sw_cons);
}
return comp;
}
static void cnic_chk_pkt_rings(struct cnic_local *cp)
{
u16 rx_cons = *cp->rx_cons_ptr;
u16 tx_cons = *cp->tx_cons_ptr;
int comp = 0;
if (cp->tx_cons != tx_cons || cp->rx_cons != rx_cons) {
if (test_bit(CNIC_LCL_FL_L2_WAIT, &cp->cnic_local_flags))
comp = cnic_l2_completion(cp);
cp->tx_cons = tx_cons;
cp->rx_cons = rx_cons;
uio_event_notify(cp->cnic_uinfo);
}
if (comp)
clear_bit(CNIC_LCL_FL_L2_WAIT, &cp->cnic_local_flags);
}
static int cnic_service_bnx2(void *data, void *status_blk)
@ -4168,6 +4207,8 @@ static void cnic_init_rings(struct cnic_dev *dev)
for (i = 0; i < sizeof(struct ustorm_eth_rx_producers) / 4; i++)
CNIC_WR(dev, off + i * 4, ((u32 *) &rx_prods)[i]);
set_bit(CNIC_LCL_FL_L2_WAIT, &cp->cnic_local_flags);
cnic_init_bnx2x_tx_ring(dev);
cnic_init_bnx2x_rx_ring(dev);
@ -4175,6 +4216,15 @@ static void cnic_init_rings(struct cnic_dev *dev)
l5_data.phy_address.hi = 0;
cnic_submit_kwqe_16(dev, RAMROD_CMD_ID_ETH_CLIENT_SETUP,
BNX2X_ISCSI_L2_CID, ETH_CONNECTION_TYPE, &l5_data);
i = 0;
while (test_bit(CNIC_LCL_FL_L2_WAIT, &cp->cnic_local_flags) &&
++i < 10)
msleep(1);
if (test_bit(CNIC_LCL_FL_L2_WAIT, &cp->cnic_local_flags))
netdev_err(dev->netdev,
"iSCSI CLIENT_SETUP did not complete\n");
cnic_kwq_completion(dev, 1);
cnic_ring_ctl(dev, BNX2X_ISCSI_L2_CID, cli, 1);
}
}
@ -4187,14 +4237,25 @@ static void cnic_shutdown_rings(struct cnic_dev *dev)
struct cnic_local *cp = dev->cnic_priv;
u32 cli = BNX2X_ISCSI_CL_ID(CNIC_E1HVN(cp));
union l5cm_specific_data l5_data;
int i;
cnic_ring_ctl(dev, BNX2X_ISCSI_L2_CID, cli, 0);
set_bit(CNIC_LCL_FL_L2_WAIT, &cp->cnic_local_flags);
l5_data.phy_address.lo = cli;
l5_data.phy_address.hi = 0;
cnic_submit_kwqe_16(dev, RAMROD_CMD_ID_ETH_HALT,
BNX2X_ISCSI_L2_CID, ETH_CONNECTION_TYPE, &l5_data);
msleep(10);
i = 0;
while (test_bit(CNIC_LCL_FL_L2_WAIT, &cp->cnic_local_flags) &&
++i < 10)
msleep(1);
if (test_bit(CNIC_LCL_FL_L2_WAIT, &cp->cnic_local_flags))
netdev_err(dev->netdev,
"iSCSI CLIENT_HALT did not complete\n");
cnic_kwq_completion(dev, 1);
memset(&l5_data, 0, sizeof(l5_data));
cnic_submit_kwqe_16(dev, RAMROD_CMD_ID_ETH_CFC_DEL,
@ -4315,7 +4376,15 @@ static void cnic_stop_hw(struct cnic_dev *dev)
{
if (test_bit(CNIC_F_CNIC_UP, &dev->flags)) {
struct cnic_local *cp = dev->cnic_priv;
int i = 0;
/* Need to wait for the ring shutdown event to complete
* before clearing the CNIC_UP flag.
*/
while (cp->uio_dev != -1 && i < 15) {
msleep(100);
i++;
}
clear_bit(CNIC_F_CNIC_UP, &dev->flags);
rcu_assign_pointer(cp->ulp_ops[CNIC_ULP_L4], NULL);
synchronize_rcu();

5
drivers/net/cnic.h
View File

@ -181,6 +181,7 @@ struct cnic_local {
unsigned long cnic_local_flags;
#define CNIC_LCL_FL_KWQ_INIT 0x0
#define CNIC_LCL_FL_L2_WAIT 0x1
struct cnic_dev *dev;
@ -348,6 +349,10 @@ struct bnx2x_bd_chain_next {
#define BNX2X_RCQ_DESC_CNT (BCM_PAGE_SIZE / sizeof(union eth_rx_cqe))
#define BNX2X_MAX_RCQ_DESC_CNT (BNX2X_RCQ_DESC_CNT - 1)
#define BNX2X_NEXT_RCQE(x) (((x) & BNX2X_MAX_RCQ_DESC_CNT) == \
(BNX2X_MAX_RCQ_DESC_CNT - 1)) ? \
((x) + 2) : ((x) + 1)
#define BNX2X_DEF_SB_ID 16
#define BNX2X_ISCSI_RX_SB_INDEX_NUM \