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RDMA/qedr: properly check atomic capabilities 

After checking the path upwards towards root complex, actualy check
root complex atomic_req capability, and not our own NIC.
Verify that the PCIe device control register's atomic egress block
is cleared in the path.
Verify that the PCIe version is at least 2.

Signed-off-by: Ram Amrani <Ram.Amrani@cavium.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Amrani, Ram 2017-04-27 13:35:32 +03:00 committed by Doug Ledford
parent 08c4cf51e3
commit f92faaba11
2 changed files with 46 additions and 30 deletions
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75
drivers/infiniband/hw/qedr/main.c
View File

@ -340,43 +340,58 @@ static void qedr_remove_sysfiles(struct qedr_dev *dev)
static void qedr_pci_set_atomic(struct qedr_dev *dev, struct pci_dev *pdev)
{
struct pci_dev *bridge;
u32 val;
dev->atomic_cap = IB_ATOMIC_NONE;
u32 ctl2, cap2;
u16 flags;
int rc;
bridge = pdev->bus->self;
if (!bridge)
return;
goto disable;
/* Check whether we are connected directly or via a switch */
while (bridge && bridge->bus->parent) {
DP_DEBUG(dev, QEDR_MSG_INIT,
"Device is not connected directly to root. bridge->bus->number=%d primary=%d\n",
bridge->bus->number, bridge->bus->primary);
/* Need to check Atomic Op Routing Supported all the way to
* root complex.
*/
pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2, &val);
if (!(val & PCI_EXP_DEVCAP2_ATOMIC_ROUTE)) {
pcie_capability_clear_word(pdev,
PCI_EXP_DEVCTL2,
PCI_EXP_DEVCTL2_ATOMIC_REQ);
return;
}
/* Check atomic routing support all the way to root complex */
while (bridge->bus->parent) {
rc = pcie_capability_read_word(bridge, PCI_EXP_FLAGS, &flags);
if (rc || ((flags & PCI_EXP_FLAGS_VERS) < 2))
goto disable;
rc = pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2, &cap2);
if (rc)
goto disable;
rc = pcie_capability_read_dword(bridge, PCI_EXP_DEVCTL2, &ctl2);
if (rc)
goto disable;
if (!(cap2 & PCI_EXP_DEVCAP2_ATOMIC_ROUTE) ||
(ctl2 & PCI_EXP_DEVCTL2_ATOMIC_EGRESS_BLOCK))
goto disable;
bridge = bridge->bus->parent->self;
}
bridge = pdev->bus->self;
/* according to bridge capability */
pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2, &val);
if (val & PCI_EXP_DEVCAP2_ATOMIC_COMP64) {
pcie_capability_set_word(pdev, PCI_EXP_DEVCTL2,
PCI_EXP_DEVCTL2_ATOMIC_REQ);
dev->atomic_cap = IB_ATOMIC_GLOB;
} else {
pcie_capability_clear_word(pdev, PCI_EXP_DEVCTL2,
PCI_EXP_DEVCTL2_ATOMIC_REQ);
}
rc = pcie_capability_read_word(bridge, PCI_EXP_FLAGS, &flags);
if (rc || ((flags & PCI_EXP_FLAGS_VERS) < 2))
goto disable;
rc = pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2, &cap2);
if (rc || !(cap2 & PCI_EXP_DEVCAP2_ATOMIC_COMP64))
goto disable;
/* Set atomic operations */
pcie_capability_set_word(pdev, PCI_EXP_DEVCTL2,
PCI_EXP_DEVCTL2_ATOMIC_REQ);
dev->atomic_cap = IB_ATOMIC_GLOB;
DP_DEBUG(dev, QEDR_MSG_INIT, "Atomic capability enabled\n");
return;
disable:
pcie_capability_clear_word(pdev, PCI_EXP_DEVCTL2,
PCI_EXP_DEVCTL2_ATOMIC_REQ);
dev->atomic_cap = IB_ATOMIC_NONE;
DP_DEBUG(dev, QEDR_MSG_INIT, "Atomic capability disabled\n");
}
static const struct qed_rdma_ops *qed_ops;

1
include/uapi/linux/pci_regs.h
View File

@ -630,6 +630,7 @@
#define PCI_EXP_DEVCTL2_COMP_TIMEOUT 0x000f /* Completion Timeout Value */
#define PCI_EXP_DEVCTL2_ARI 0x0020 /* Alternative Routing-ID */
#define PCI_EXP_DEVCTL2_ATOMIC_REQ 0x0040 /* Set Atomic requests */
#define PCI_EXP_DEVCTL2_ATOMIC_EGRESS_BLOCK 0x0080 /* Block atomic egress */
#define PCI_EXP_DEVCTL2_IDO_REQ_EN 0x0100 /* Allow IDO for requests */
#define PCI_EXP_DEVCTL2_IDO_CMP_EN 0x0200 /* Allow IDO for completions */
#define PCI_EXP_DEVCTL2_LTR_EN 0x0400 /* Enable LTR mechanism */