bnxt_en: Fix firmware message delay loop regression.

A recent change to reduce delay granularity waiting for firmware
reponse has caused a regression.  With a tighter delay loop,
the driver may see the beginning part of the response faster.
The original 5 usec delay to wait for the rest of the message
is not long enough and some messages are detected as invalid.

Increase the maximum wait time from 5 usec to 20 usec.  Also, fix
the debug message that shows the total delay time for the response
when the message times out.  With the new logic, the delay time
is not fixed per iteration of the loop, so we define a macro to
show the total delay time.

Fixes: 9751e8e71487 ("bnxt_en: reduce timeout on initial HWRM calls")
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index efe5c7203f609b1392f50b1644ee813ab45c1912..168342ac35c552d8640e04bb35477746b4381c71 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -3530,6 +3530,8 @@ static int bnxt_hwrm_do_send_msg(struct bnxt *bp, void *msg, u32 msg_len,
                      HWRM_RESP_LEN_SFT;
                valid = bp->hwrm_cmd_resp_addr + len - 1;
        } else {
+               int j;
+
                /* Check if response len is updated */
                for (i = 0; i < tmo_count; i++) {
                        len = (le32_to_cpu(*resp_len) & HWRM_RESP_LEN_MASK) >>
@@ -3547,14 +3549,15 @@ static int bnxt_hwrm_do_send_msg(struct bnxt *bp, void *msg, u32 msg_len,
 
                if (i >= tmo_count) {
                        netdev_err(bp->dev, "Error (timeout: %d) msg {0x%x 0x%x} len:%d\n",
-                                  timeout, le16_to_cpu(req->req_type),
+                                  HWRM_TOTAL_TIMEOUT(i),
+                                  le16_to_cpu(req->req_type),
                                   le16_to_cpu(req->seq_id), len);
                        return -1;
                }
 
                /* Last byte of resp contains valid bit */
                valid = bp->hwrm_cmd_resp_addr + len - 1;
-               for (i = 0; i < 5; i++) {
+               for (j = 0; j < HWRM_VALID_BIT_DELAY_USEC; j++) {
                        /* make sure we read from updated DMA memory */
                        dma_rmb();
                        if (*valid)
@@ -3562,9 +3565,10 @@ static int bnxt_hwrm_do_send_msg(struct bnxt *bp, void *msg, u32 msg_len,
                        udelay(1);
                }
 
-               if (i >= 5) {
+               if (j >= HWRM_VALID_BIT_DELAY_USEC) {
                        netdev_err(bp->dev, "Error (timeout: %d) msg {0x%x 0x%x} len:%d v:%d\n",
-                                  timeout, le16_to_cpu(req->req_type),
+                                  HWRM_TOTAL_TIMEOUT(i),
+                                  le16_to_cpu(req->req_type),
                                   le16_to_cpu(req->seq_id), len, *valid);
                        return -1;
                }

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 8df1d8b9d2e363f3e753b3b97cf625815dac1fd9..a9c210e7086816d225aca96d34675a7786e814e5 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -539,6 +539,13 @@ struct rx_tpa_end_cmp_ext {
 #define HWRM_MIN_TIMEOUT               25
 #define HWRM_MAX_TIMEOUT               40
 
+#define HWRM_TOTAL_TIMEOUT(n)  (((n) <= HWRM_SHORT_TIMEOUT_COUNTER) ?  \
+       ((n) * HWRM_SHORT_MIN_TIMEOUT) :                                \
+       (HWRM_SHORT_TIMEOUT_COUNTER * HWRM_SHORT_MIN_TIMEOUT +          \
+        ((n) - HWRM_SHORT_TIMEOUT_COUNTER) * HWRM_MIN_TIMEOUT))
+
+#define HWRM_VALID_BIT_DELAY_USEC      20
+
 #define BNXT_RX_EVENT  1
 #define BNXT_AGG_EVENT 2
 #define BNXT_TX_EVENT  4