netdev - [PATCH iwl-next v1] ixgbe: reduce number of reads when getting OROM data

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Message-Id: <20250731125025.1683557-1-jedrzej.jagielski@intel.com>
Date: Thu, 31 Jul 2025 14:50:25 +0200
From: Jedrzej Jagielski <jedrzej.jagielski@...el.com>
To: intel-wired-lan@...ts.osuosl.org
Cc: anthony.l.nguyen@...el.com,
	netdev@...r.kernel.org,
	Jedrzej Jagielski <jedrzej.jagielski@...el.com>,
	Aleksandr Loktionov <aleksandr.loktionov@...el.com>
Subject: [PATCH iwl-next v1] ixgbe: reduce number of reads when getting OROM data

Currently, during locating the CIVD section, the ixgbe driver loops
over the OROM area and at each iteration reads only OROM-datastruct-size
amount of data. This results in many small reads and is inefficient.

Optimize this by reading the entire OROM bank into memory once before
entering the loop. This significantly reduces the probing time.

Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski@...el.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_e610.c | 58 +++++++++++++------
 1 file changed, 39 insertions(+), 19 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_e610.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_e610.c
index 87b03c1992a8..048b2aae155a 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_e610.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_e610.c
@@ -3006,50 +3006,70 @@ static int ixgbe_get_nvm_srev(struct ixgbe_hw *hw,
  * Searches through the Option ROM flash contents to locate the CIVD data for
  * the image.
  *
- * Return: the exit code of the operation.
+ * Return: -ENOMEM when cannot allocate memory, -EDOM for checksum violation,
+ *	   -ENODATA when cannot find proper data, -EIO for faulty read or
+ *	   0 on success.
+ *
+ *	   On success @civd stores collected data.
  */
 static int
 ixgbe_get_orom_civd_data(struct ixgbe_hw *hw, enum ixgbe_bank_select bank,
 			 struct ixgbe_orom_civd_info *civd)
 {
-	struct ixgbe_orom_civd_info tmp;
+	u32 orom_size = hw->flash.banks.orom_size;
+	u8 *orom_data;
 	u32 offset;
 	int err;
 
+	orom_data = kzalloc(orom_size, GFP_KERNEL);
+	if (!orom_data)
+		return -ENOMEM;
+
+	err = ixgbe_read_flash_module(hw, bank,
+				      IXGBE_E610_SR_1ST_OROM_BANK_PTR, 0,
+				      orom_data, orom_size);
+	if (err) {
+		err = -EIO;
+		goto cleanup;
+	}
+
 	/* The CIVD section is located in the Option ROM aligned to 512 bytes.
 	 * The first 4 bytes must contain the ASCII characters "$CIV".
 	 * A simple modulo 256 sum of all of the bytes of the structure must
 	 * equal 0.
 	 */
-	for (offset = 0; (offset + SZ_512) <= hw->flash.banks.orom_size;
-	     offset += SZ_512) {
+	for (offset = 0; (offset + SZ_512) <= orom_size; offset += SZ_512) {
+		struct ixgbe_orom_civd_info *tmp;
 		u8 sum = 0;
 		u32 i;
 
-		err = ixgbe_read_flash_module(hw, bank,
-					      IXGBE_E610_SR_1ST_OROM_BANK_PTR,
-					      offset,
-					      (u8 *)&tmp, sizeof(tmp));
-		if (err)
-			return err;
+		BUILD_BUG_ON(sizeof(*tmp) > SZ_512);
+
+		tmp = (struct ixgbe_orom_civd_info *)&orom_data[offset];
 
 		/* Skip forward until we find a matching signature */
-		if (memcmp(IXGBE_OROM_CIV_SIGNATURE, tmp.signature,
-			   sizeof(tmp.signature)))
+		if (memcmp(IXGBE_OROM_CIV_SIGNATURE, tmp->signature,
+			   sizeof(tmp->signature)))
 			continue;
 
 		/* Verify that the simple checksum is zero */
-		for (i = 0; i < sizeof(tmp); i++)
-			sum += ((u8 *)&tmp)[i];
+		for (i = 0; i < sizeof(*tmp); i++)
+			sum += ((u8 *)tmp)[i];
 
-		if (sum)
-			return -EDOM;
+		if (sum) {
+			err = -EDOM;
+			goto cleanup;
+		}
 
-		*civd = tmp;
-		return 0;
+		*civd = *tmp;
+		err = 0;
+		goto cleanup;
 	}
 
-	return -ENODATA;
+	err = -ENODATA;
+cleanup:
+	kfree(orom_data);
+	return err;
 }
 
 /**
-- 
2.31.1