From: Helin Zhang <helin.zhang@intel.com>
Date: Thu, 30 Apr 2015 15:03:19 +0000 (+0800)
Subject: i40e/base: enhance polling of NVM semaphore
X-Git-Tag: spdx-start~9207
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=9b1041574cd4886c7c00334af21472ead71fb85d;p=dpdk.git

i40e/base: enhance polling of NVM semaphore

Only poll on the NVM semaphore if there's time left on a previous
reservation.

Test report: http://www.dpdk.org/ml/archives/dev/2015-May/017384.html

Signed-off-by: Helin Zhang <helin.zhang@intel.com>
Acked-by: Jijiang Liu <jijiang.liu@intel.com>
Tested-by: Min Cao <min.cao@intel.com>
---

diff --git a/lib/librte_pmd_i40e/i40e/i40e_nvm.c b/lib/librte_pmd_i40e/i40e/i40e_nvm.c
index 2f3c6a6c67..47a4285e6c 100644
--- a/lib/librte_pmd_i40e/i40e/i40e_nvm.c
+++ b/lib/librte_pmd_i40e/i40e/i40e_nvm.c
@@ -101,7 +101,7 @@ enum i40e_status_code i40e_acquire_nvm(struct i40e_hw *hw,
 {
 	enum i40e_status_code ret_code = I40E_SUCCESS;
 	u64 gtime, timeout;
-	u64 time = 0;
+	u64 time_left = 0;
 
 	DEBUGFUNC("i40e_acquire_nvm");
 
@@ -109,40 +109,39 @@ enum i40e_status_code i40e_acquire_nvm(struct i40e_hw *hw,
 		goto i40e_i40e_acquire_nvm_exit;
 
 	ret_code = i40e_aq_request_resource(hw, I40E_NVM_RESOURCE_ID, access,
-					    0, &time, NULL);
+					    0, &time_left, NULL);
 	/* Reading the Global Device Timer */
 	gtime = rd32(hw, I40E_GLVFGEN_TIMER);
 
 	/* Store the timeout */
-	hw->nvm.hw_semaphore_timeout = I40E_MS_TO_GTIME(time) + gtime;
+	hw->nvm.hw_semaphore_timeout = I40E_MS_TO_GTIME(time_left) + gtime;
 
-	if (ret_code != I40E_SUCCESS) {
-		/* Set the polling timeout */
-		if (time > I40E_MAX_NVM_TIMEOUT)
-			timeout = I40E_MS_TO_GTIME(I40E_MAX_NVM_TIMEOUT)
-				  + gtime;
-		else
-			timeout = hw->nvm.hw_semaphore_timeout;
+	if (ret_code)
+		i40e_debug(hw, I40E_DEBUG_NVM,
+			   "NVM acquire type %d failed time_left=%llu ret=%d aq_err=%d\n",
+			   access, time_left, ret_code, hw->aq.asq_last_status);
+
+	if (ret_code && time_left) {
 		/* Poll until the current NVM owner timeouts */
-		while (gtime < timeout) {
+		timeout = I40E_MS_TO_GTIME(I40E_MAX_NVM_TIMEOUT) + gtime;
+		while ((gtime < timeout) && time_left) {
 			i40e_msec_delay(10);
+			gtime = rd32(hw, I40E_GLVFGEN_TIMER);
 			ret_code = i40e_aq_request_resource(hw,
 							I40E_NVM_RESOURCE_ID,
-							access, 0, &time,
+							access, 0, &time_left,
 							NULL);
 			if (ret_code == I40E_SUCCESS) {
 				hw->nvm.hw_semaphore_timeout =
-						I40E_MS_TO_GTIME(time) + gtime;
+					    I40E_MS_TO_GTIME(time_left) + gtime;
 				break;
 			}
-			gtime = rd32(hw, I40E_GLVFGEN_TIMER);
 		}
 		if (ret_code != I40E_SUCCESS) {
 			hw->nvm.hw_semaphore_timeout = 0;
-			hw->nvm.hw_semaphore_wait =
-						I40E_MS_TO_GTIME(time) + gtime;
-			DEBUGOUT1("NVM acquire timed out, wait %llu ms before trying again.\n",
-				  time);
+			i40e_debug(hw, I40E_DEBUG_NVM,
+				   "NVM acquire timed out, wait %llu ms before trying again. status=%d aq_err=%d\n",
+				   time_left, ret_code, hw->aq.asq_last_status);
 		}
 	}