From bfcf3af1b6ccb9eb022ceabcc6d41f3985445c3f Mon Sep 17 00:00:00 2001 From: Chengchang Tang Date: Tue, 13 Apr 2021 19:50:03 +0800 Subject: [PATCH 100/189] net/hns3: fix timing in mailbox Currently, when processing MBX messages, the system timestamp is obtained to determine whether timeout occurs. However, the gettimeofday function is not monotonically increasing. Therefore, this may lead to incorrect judgment or difficulty exiting the loop. And actually, in this scenario, it is not necessary to obtain the timestamp. This patch deletes the call to the gettimeofday function during MBX message processing. Fixes: 463e748964f5 ("net/hns3: support mailbox") Cc: stable@dpdk.org Signed-off-by: Chengchang Tang Signed-off-by: Min Hu (Connor) --- drivers/net/hns3/hns3_mbx.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/drivers/net/hns3/hns3_mbx.c b/drivers/net/hns3/hns3_mbx.c index 5a88fe2..9955f27 100644 --- a/drivers/net/hns3/hns3_mbx.c +++ b/drivers/net/hns3/hns3_mbx.c @@ -61,13 +61,12 @@ static int hns3_get_mbx_resp(struct hns3_hw *hw, uint16_t code, uint16_t subcode, uint8_t *resp_data, uint16_t resp_len) { -#define HNS3_MAX_RETRY_MS 500 +#define HNS3_MAX_RETRY_US 500000 #define HNS3_WAIT_RESP_US 100 struct hns3_adapter *hns = HNS3_DEV_HW_TO_ADAPTER(hw); struct hns3_mbx_resp_status *mbx_resp; + uint32_t wait_time = 0; bool received; - uint64_t now; - uint64_t end; if (resp_len > HNS3_MBX_MAX_RESP_DATA_SIZE) { hns3_err(hw, "VF mbx response len(=%u) exceeds maximum(=%d)", @@ -75,9 +74,7 @@ hns3_get_mbx_resp(struct hns3_hw *hw, uint16_t code, uint16_t subcode, return -EINVAL; } - now = get_timeofday_ms(); - end = now + HNS3_MAX_RETRY_MS; - while (now < end) { + while (wait_time < HNS3_MAX_RETRY_US) { if (__atomic_load_n(&hw->reset.disable_cmd, __ATOMIC_RELAXED)) { hns3_err(hw, "Don't wait for mbx respone because of " "disable_cmd"); @@ -103,10 +100,10 @@ hns3_get_mbx_resp(struct hns3_hw *hw, uint16_t code, uint16_t subcode, if (received) break; - now = get_timeofday_ms(); + wait_time += HNS3_WAIT_RESP_US; } hw->mbx_resp.req_msg_data = 0; - if (now >= end) { + if (wait_time >= HNS3_MAX_RETRY_US) { hns3_mbx_proc_timeout(hw, code, subcode); return -ETIME; } -- 2.7.4