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Subject[PATCH v3 11/14] habanalabs/gaudi: add QP error handling
Date
From: Omer Shpigelman <oshpigelman@habana.ai>

Add Queue Pair (QP) error notification to the user e.g. security violation,
too many retransmissions, invalid QP etc.

Whenever a QP caused an error, the firmware will send an event to the
driver which will push the error as an error entry to the Completion Queue
(if exists).

Signed-off-by: Omer Shpigelman <oshpigelman@habana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
---
drivers/misc/habanalabs/gaudi/gaudi.c | 13 ++++
drivers/misc/habanalabs/gaudi/gaudiP.h | 1 +
drivers/misc/habanalabs/gaudi/gaudi_nic.c | 95 +++++++++++++++++++++++
3 files changed, 109 insertions(+)

diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index 4602e4780651..71c9e2d18032 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi.c
@@ -6660,6 +6660,19 @@ static void gaudi_handle_eqe(struct hl_device *hdev,
hl_fw_unmask_irq(hdev, event_type);
break;

+ case GAUDI_EVENT_NIC0_QP0:
+ case GAUDI_EVENT_NIC0_QP1:
+ case GAUDI_EVENT_NIC1_QP0:
+ case GAUDI_EVENT_NIC1_QP1:
+ case GAUDI_EVENT_NIC2_QP0:
+ case GAUDI_EVENT_NIC2_QP1:
+ case GAUDI_EVENT_NIC3_QP0:
+ case GAUDI_EVENT_NIC3_QP1:
+ case GAUDI_EVENT_NIC4_QP0:
+ case GAUDI_EVENT_NIC4_QP1:
+ gaudi_nic_handle_qp_err(hdev, event_type);
+ break;
+
case GAUDI_EVENT_PSOC_GPIO_U16_0:
cause = le64_to_cpu(eq_entry->data[0]) & 0xFF;
dev_err(hdev->dev,
diff --git a/drivers/misc/habanalabs/gaudi/gaudiP.h b/drivers/misc/habanalabs/gaudi/gaudiP.h
index 3158d5d68c1d..7d7439da88bc 100644
--- a/drivers/misc/habanalabs/gaudi/gaudiP.h
+++ b/drivers/misc/habanalabs/gaudi/gaudiP.h
@@ -576,5 +576,6 @@ netdev_tx_t gaudi_nic_handle_tx_pkt(struct gaudi_nic_device *gaudi_nic,
struct sk_buff *skb);
int gaudi_nic_sw_init(struct hl_device *hdev);
void gaudi_nic_sw_fini(struct hl_device *hdev);
+void gaudi_nic_handle_qp_err(struct hl_device *hdev, u16 event_type);

#endif /* GAUDIP_H_ */
diff --git a/drivers/misc/habanalabs/gaudi/gaudi_nic.c b/drivers/misc/habanalabs/gaudi/gaudi_nic.c
index 37f25247f751..49e94e9c786a 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi_nic.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi_nic.c
@@ -3988,3 +3988,98 @@ int gaudi_nic_cq_mmap(struct hl_device *hdev, struct vm_area_struct *vma)

return rc;
}
+
+static char *get_syndrome_text(u32 syndrome)
+{
+ char *str;
+
+ switch (syndrome) {
+ case 0x05:
+ str = "Rx got invalid QP";
+ break;
+ case 0x06:
+ str = "Rx transport service mismatch";
+ break;
+ case 0x09:
+ str = "Rx Rkey check failed";
+ break;
+ case 0x40:
+ str = "timer retry exceeded";
+ break;
+ case 0x41:
+ str = "NACK retry exceeded";
+ break;
+ case 0x42:
+ str = "doorbell on invalid QP";
+ break;
+ case 0x43:
+ str = "doorbell security check failed";
+ break;
+ case 0x44:
+ str = "Tx got invalid QP";
+ break;
+ case 0x45:
+ str = "responder got ACK/NACK on invalid QP";
+ break;
+ case 0x46:
+ str = "responder try to send ACK/NACK on invalid QP";
+ break;
+ default:
+ str = "unknown syndrome";
+ break;
+ }
+
+ return str;
+}
+
+void gaudi_nic_handle_qp_err(struct hl_device *hdev, u16 event_type)
+{
+ struct gaudi_device *gaudi = hdev->asic_specific;
+ struct gaudi_nic_device *gaudi_nic;
+ struct qp_err *qp_err_arr;
+ struct hl_nic_cqe cqe_sw;
+ u32 pi, ci;
+
+ gaudi_nic = &gaudi->nic_devices[event_type - GAUDI_EVENT_NIC0_QP0];
+ qp_err_arr = gaudi_nic->qp_err_mem_cpu;
+
+ mutex_lock(&gaudi->nic_qp_err_lock);
+
+ if (!gaudi->nic_cq_enable)
+ dev_err_ratelimited(hdev->dev,
+ "received NIC %d QP error event %d but no CQ to push it\n",
+ gaudi_nic->port, event_type);
+
+ pi = NIC_RREG32(mmNIC0_QPC0_ERR_FIFO_PRODUCER_INDEX);
+ ci = gaudi_nic->qp_err_ci;
+
+ cqe_sw.is_err = true;
+ cqe_sw.port = gaudi_nic->port;
+
+ while (ci < pi) {
+ cqe_sw.type = QP_ERR_IS_REQ(qp_err_arr[ci]) ?
+ HL_NIC_CQE_TYPE_REQ : HL_NIC_CQE_TYPE_RES;
+ cqe_sw.qp_number = QP_ERR_QP_NUM(qp_err_arr[ci]);
+ cqe_sw.qp_err.syndrome = QP_ERR_ERR_NUM(qp_err_arr[ci]);
+
+ ci = (ci + 1) & (QP_ERR_BUF_LEN - 1);
+
+ dev_err_ratelimited(hdev->dev,
+ "NIC QP error port: %d, type: %d, qpn: %d, syndrome: %s (0x%x)\n",
+ cqe_sw.port, cqe_sw.type, cqe_sw.qp_number,
+ get_syndrome_text(cqe_sw.qp_err.syndrome),
+ cqe_sw.qp_err.syndrome);
+
+ if (gaudi->nic_cq_enable)
+ copy_cqe_to_main_queue(hdev, &cqe_sw);
+ }
+
+ gaudi_nic->qp_err_ci = ci;
+ NIC_WREG32(mmNIC0_QPC0_ERR_FIFO_CONSUMER_INDEX, ci);
+
+ /* signal the completion queue that there are available CQEs */
+ if (gaudi->nic_cq_enable)
+ complete(&gaudi->nic_cq_comp);
+
+ mutex_unlock(&gaudi->nic_qp_err_lock);
+}
--
2.17.1
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