-------- Forwarded Message -------- From: Jason Shi <[email protected]> Reply-to: shidj <[email protected]> To: jeffrey.t.kirsher <[email protected]> Subject: Where can I find the detail discription of IXGBE_CIAA and IXGBE_CIAD? Date: Fri, 23 Aug 2013 10:06:14 +0800
Dear Sir:
I encountered a "Hund DMA" problem when I did some work on the 82599 10G
NIC.
And I'm writing to ask you how to understand some code in the linux
ixgbe driver.
Because I noticed that these code may be commited by you, while I can
not find any
introduction about the registers involved from the latest
82599-10-gbe-controller-datasheet(v2.8).
So where can I find the detail discription of IXGBE_CIAA and IXGBE_CIAD?
When "Hung DMA" happened, is there a way to make the VF work again
without a hard reset?
ixgbe_main.c
+static void ixgbe_check_for_bad_vf(struct ixgbe_adapter *adapter)
+{
+ int vf;
+ struct ixgbe_hw *hw = &adapter->hw;
+ struct net_device *netdev = adapter->netdev;
+ u32 gpc;
+ u32 ciaa, ciad;
+
+ gpc = IXGBE_READ_REG(hw, IXGBE_TXDGPC);
+ if (gpc) /* If incrementing then no need for the check below */
+ return;
+ /*
+ * Check to see if a bad DMA write target from an errant or
+ * malicious VF has caused a PCIe error. If so then we can
+ * issue a VFLR to the offending VF(s) and then resume without
+ * requesting a full slot reset.
+ */
+
+ for (vf = 0; vf < adapter->num_vfs; vf++) {
+ ciaa = (vf << 16) | 0x80000000;
+ /* 32 bit read so align, we really want status at offset 6 */
+ ciaa |= PCI_COMMAND;
+ IXGBE_WRITE_REG(hw, IXGBE_CIAA_82599, ciaa);
+ ciad = IXGBE_READ_REG(hw, IXGBE_CIAD_82599);
+ ciaa &= 0x7FFFFFFF;
+ /* disable debug mode asap after reading data */
+ IXGBE_WRITE_REG(hw, IXGBE_CIAA_82599, ciaa);
+ /* Get the upper 16 bits which will be the PCI status reg */
+ ciad >>= 16;
+ if (ciad & PCI_STATUS_REC_MASTER_ABORT) {
+ netdev_err(netdev, "VF %d Hung DMA\n", vf);
+ /* Issue VFLR */
+ ciaa = (vf << 16) | 0x80000000;
+ ciaa |= 0xA8;
+ IXGBE_WRITE_REG(hw, IXGBE_CIAA_82599, ciaa);
+ ciad = 0x00008000; /* VFLR */
+ IXGBE_WRITE_REG(hw, IXGBE_CIAD_82599, ciad);
+ ciaa &= 0x7FFFFFFF;
+ IXGBE_WRITE_REG(hw, IXGBE_CIAA_82599, ciaa);
+ }
+ }
+}
Best reguards! :>
May the force be with you.
________________________________________________________________________
Jason Shi
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