From: Helin Zhang <helin.zhang@intel.com>
Date: Thu, 30 Apr 2015 15:03:20 +0000 (+0800)
Subject: i40e/base: enhance NVM checksum calculation
X-Git-Tag: spdx-start~9206
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=432e19c3d04915cdac9aabfd3f59954301a92049;p=dpdk.git

i40e/base: enhance NVM checksum calculation

The data buffer for i40e_calc_nvm_checksum() is too big, so move
it off and allocate separately. In addition, use
i40e_read_nvm_buffer() to get the whole shadow RAM, together with
minor enhancements.

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 47a4285e6c..f1a1e889de 100644
--- a/lib/librte_pmd_i40e/i40e/i40e_nvm.c
+++ b/lib/librte_pmd_i40e/i40e/i40e_nvm.c
@@ -542,14 +542,21 @@ enum i40e_status_code i40e_write_nvm_buffer(struct i40e_hw *hw,
 enum i40e_status_code i40e_calc_nvm_checksum(struct i40e_hw *hw, u16 *checksum)
 {
 	enum i40e_status_code ret_code = I40E_SUCCESS;
+	struct i40e_virt_mem vmem;
 	u16 pcie_alt_module = 0;
 	u16 checksum_local = 0;
 	u16 vpd_module = 0;
-	u16 word = 0;
-	u32 i = 0;
+	u16 *data;
+	u16 i = 0;
 
 	DEBUGFUNC("i40e_calc_nvm_checksum");
 
+	ret_code = i40e_allocate_virt_mem(hw, &vmem,
+				    I40E_SR_SECTOR_SIZE_IN_WORDS * sizeof(u16));
+	if (ret_code)
+		goto i40e_calc_nvm_checksum_exit;
+	data = (u16 *)vmem.va;
+
 	/* read pointer to VPD area */
 	ret_code = i40e_read_nvm_word(hw, I40E_SR_VPD_PTR, &vpd_module);
 	if (ret_code != I40E_SUCCESS) {
@@ -559,7 +566,7 @@ enum i40e_status_code i40e_calc_nvm_checksum(struct i40e_hw *hw, u16 *checksum)
 
 	/* read pointer to PCIe Alt Auto-load module */
 	ret_code = i40e_read_nvm_word(hw, I40E_SR_PCIE_ALT_AUTO_LOAD_PTR,
-				       &pcie_alt_module);
+				      &pcie_alt_module);
 	if (ret_code != I40E_SUCCESS) {
 		ret_code = I40E_ERR_NVM_CHECKSUM;
 		goto i40e_calc_nvm_checksum_exit;
@@ -569,33 +576,39 @@ enum i40e_status_code i40e_calc_nvm_checksum(struct i40e_hw *hw, u16 *checksum)
 	 * except the VPD and PCIe ALT Auto-load modules
 	 */
 	for (i = 0; i < hw->nvm.sr_size; i++) {
+		/* Read SR page */
+		if ((i % I40E_SR_SECTOR_SIZE_IN_WORDS) == 0) {
+			u16 words = I40E_SR_SECTOR_SIZE_IN_WORDS;
+			ret_code = i40e_read_nvm_buffer(hw, i, &words, data);
+			if (ret_code != I40E_SUCCESS) {
+				ret_code = I40E_ERR_NVM_CHECKSUM;
+				goto i40e_calc_nvm_checksum_exit;
+			}
+		}
+
 		/* Skip Checksum word */
 		if (i == I40E_SR_SW_CHECKSUM_WORD)
-			i++;
+			continue;
 		/* Skip VPD module (convert byte size to word count) */
-		if (i == (u32)vpd_module) {
-			i += (I40E_SR_VPD_MODULE_MAX_SIZE / 2);
-			if (i >= hw->nvm.sr_size)
-				break;
+		if ((i >= (u32)vpd_module) &&
+		    (i < ((u32)vpd_module +
+		     (I40E_SR_VPD_MODULE_MAX_SIZE / 2)))) {
+			continue;
 		}
 		/* Skip PCIe ALT module (convert byte size to word count) */
-		if (i == (u32)pcie_alt_module) {
-			i += (I40E_SR_PCIE_ALT_MODULE_MAX_SIZE / 2);
-			if (i >= hw->nvm.sr_size)
-				break;
+		if ((i >= (u32)pcie_alt_module) &&
+		    (i < ((u32)pcie_alt_module +
+		     (I40E_SR_PCIE_ALT_MODULE_MAX_SIZE / 2)))) {
+			continue;
 		}
 
-		ret_code = i40e_read_nvm_word(hw, (u16)i, &word);
-		if (ret_code != I40E_SUCCESS) {
-			ret_code = I40E_ERR_NVM_CHECKSUM;
-			goto i40e_calc_nvm_checksum_exit;
-		}
-		checksum_local += word;
+		checksum_local += data[i % I40E_SR_SECTOR_SIZE_IN_WORDS];
 	}
 
 	*checksum = (u16)I40E_SR_SW_CHECKSUM_BASE - checksum_local;
 
 i40e_calc_nvm_checksum_exit:
+	i40e_free_virt_mem(hw, &vmem);
 	return ret_code;
 }