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ixgbe: cleanup some register reads 

Remove duplicate inc of hwstats->ruc
Introduce separate loops for 8 and 16 register reads.
Consolidate mac checks under one case.
Make sure registers are cleared on read.

Reported-by: Jonathan Lynch <jonathan.lynch@thenowfactory.com>
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
CC: Jonathan Lynch <jonathan.lynch@thenowfactory.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Emil Tantilov 2011-07-26 07:51:41 +00:00 committed by Jeff Kirsher
parent 919e78a6b8
commit 1a70db4b05
1 changed files with 21 additions and 9 deletions
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30
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View File

@ -5463,20 +5463,21 @@ void ixgbe_update_stats(struct ixgbe_adapter *adapter)
netdev->stats.tx_packets = packets;
hwstats->crcerrs += IXGBE_READ_REG(hw, IXGBE_CRCERRS);
/* 8 register reads */
for (i = 0; i < 8; i++) {
/* for packet buffers not used, the register should read 0 */
mpc = IXGBE_READ_REG(hw, IXGBE_MPC(i));
missed_rx += mpc;
hwstats->mpc[i] += mpc;
total_mpc += hwstats->mpc[i];
if (hw->mac.type == ixgbe_mac_82598EB)
hwstats->rnbc[i] += IXGBE_READ_REG(hw, IXGBE_RNBC(i));
hwstats->qptc[i] += IXGBE_READ_REG(hw, IXGBE_QPTC(i));
hwstats->qbtc[i] += IXGBE_READ_REG(hw, IXGBE_QBTC(i));
hwstats->qprc[i] += IXGBE_READ_REG(hw, IXGBE_QPRC(i));
hwstats->qbrc[i] += IXGBE_READ_REG(hw, IXGBE_QBRC(i));
hwstats->pxontxc[i] += IXGBE_READ_REG(hw, IXGBE_PXONTXC(i));
hwstats->pxofftxc[i] += IXGBE_READ_REG(hw, IXGBE_PXOFFTXC(i));
switch (hw->mac.type) {
case ixgbe_mac_82598EB:
hwstats->rnbc[i] += IXGBE_READ_REG(hw, IXGBE_RNBC(i));
hwstats->qbtc[i] += IXGBE_READ_REG(hw, IXGBE_QBTC(i));
hwstats->qbrc[i] += IXGBE_READ_REG(hw, IXGBE_QBRC(i));
hwstats->pxonrxc[i] +=
IXGBE_READ_REG(hw, IXGBE_PXONRXC(i));
break;
@ -5488,9 +5489,21 @@ void ixgbe_update_stats(struct ixgbe_adapter *adapter)
default:
break;
}
hwstats->pxontxc[i] += IXGBE_READ_REG(hw, IXGBE_PXONTXC(i));
hwstats->pxofftxc[i] += IXGBE_READ_REG(hw, IXGBE_PXOFFTXC(i));
}
/*16 register reads */
for (i = 0; i < 16; i++) {
hwstats->qptc[i] += IXGBE_READ_REG(hw, IXGBE_QPTC(i));
hwstats->qprc[i] += IXGBE_READ_REG(hw, IXGBE_QPRC(i));
if ((hw->mac.type == ixgbe_mac_82599EB) ||
(hw->mac.type == ixgbe_mac_X540)) {
hwstats->qbtc[i] += IXGBE_READ_REG(hw, IXGBE_QBTC_L(i));
IXGBE_READ_REG(hw, IXGBE_QBTC_H(i)); /* to clear */
hwstats->qbrc[i] += IXGBE_READ_REG(hw, IXGBE_QBRC_L(i));
IXGBE_READ_REG(hw, IXGBE_QBRC_H(i)); /* to clear */
}
}
hwstats->gprc += IXGBE_READ_REG(hw, IXGBE_GPRC);
/* work around hardware counting issue */
hwstats->gprc -= missed_rx;
@ -5550,7 +5563,6 @@ void ixgbe_update_stats(struct ixgbe_adapter *adapter)
hwstats->lxontxc += lxon;
lxoff = IXGBE_READ_REG(hw, IXGBE_LXOFFTXC);
hwstats->lxofftxc += lxoff;
hwstats->ruc += IXGBE_READ_REG(hw, IXGBE_RUC);
hwstats->gptc += IXGBE_READ_REG(hw, IXGBE_GPTC);
hwstats->mptc += IXGBE_READ_REG(hw, IXGBE_MPTC);
/*