net: ena: improve ENA driver boot time.

The ena admin commands timeout is in resolutions of 100ms.
Therefore, When the driver works in polling mode, it sleeps for 100ms
each time. The overall boot time of the ENA driver is ~1.5 sec.
To reduce the boot time, This change modifies the granularity of
the sleeps to 5ms.
This change improves the boot time to 220ms.

Signed-off-by: Netanel Belgazal <netanel@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c
index ded29af648c915f212f16da90f94588280b73d08..bf2de5298005d0ea63ce0d9690d1786722881937 100644 (file)
--- a/drivers/net/ethernet/amazon/ena/ena_com.c
+++ b/drivers/net/ethernet/amazon/ena/ena_com.c
@@ -63,6 +63,8 @@
 
 #define ENA_REGS_ADMIN_INTR_MASK 1
 
+#define ENA_POLL_MS    5
+
 /*****************************************************************************/
 /*****************************************************************************/
 /*****************************************************************************/
@@ -533,7 +535,7 @@ static int ena_com_wait_and_process_admin_cq_polling(struct ena_comp_ctx *comp_c
                        goto err;
                }
 
-               msleep(100);
+               msleep(ENA_POLL_MS);
        }
 
        if (unlikely(comp_ctx->status == ENA_CMD_ABORTED)) {
@@ -746,6 +748,9 @@ static int wait_for_reset_state(struct ena_com_dev *ena_dev, u32 timeout,
 {
        u32 val, i;
 
+       /* Convert timeout from resolution of 100ms to ENA_POLL_MS */
+       timeout = (timeout * 100) / ENA_POLL_MS;
+
        for (i = 0; i < timeout; i++) {
                val = ena_com_reg_bar_read32(ena_dev, ENA_REGS_DEV_STS_OFF);
 
@@ -758,8 +763,7 @@ static int wait_for_reset_state(struct ena_com_dev *ena_dev, u32 timeout,
                        exp_state)
                        return 0;
 
-               /* The resolution of the timeout is 100ms */
-               msleep(100);
+               msleep(ENA_POLL_MS);
        }
 
        return -ETIME;
@@ -1253,7 +1257,7 @@ void ena_com_wait_for_abort_completion(struct ena_com_dev *ena_dev)
        spin_lock_irqsave(&admin_queue->q_lock, flags);
        while (atomic_read(&admin_queue->outstanding_cmds) != 0) {
                spin_unlock_irqrestore(&admin_queue->q_lock, flags);
-               msleep(20);
+               msleep(ENA_POLL_MS);
                spin_lock_irqsave(&admin_queue->q_lock, flags);
        }
        spin_unlock_irqrestore(&admin_queue->q_lock, flags);