ixgbe: Fix issues with EEPROM access

There are two problems with EEPROM access. One is that it needs to
hold the semaphore until the entire response is read or else the
response can be corrupted by other firmware accesses. The second
problem is that acquiring and releasing the semaphore is slow, so
it should be taken and released once when multiple EEPROM accesses
will be done.

Both of these issues can be solved by adding a new function,
ixgbe_hic_unlocked, to issue firmware commands that will assume
that the caller has acquired the needed semaphore.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 28 insertions, 47 deletions

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
index e3d14f4a53f2..398973eed903 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
@@ -624,41 +624,6 @@ static s32 ixgbe_read_iosf_sb_reg_x550a(struct ixgbe_hw *hw, u32 reg_addr,
 	return status;
 }
 
-/** ixgbe_read_ee_hostif_data_X550 - Read EEPROM word using a host interface
- *  command assuming that the semaphore is already obtained.
- *  @hw: pointer to hardware structure
- *  @offset: offset of  word in the EEPROM to read
- *  @data: word read from the EEPROM
- *
- *  Reads a 16 bit word from the EEPROM using the hostif.
- **/
-static s32 ixgbe_read_ee_hostif_data_X550(struct ixgbe_hw *hw, u16 offset,
-					  u16 *data)
-{
-	s32 status;
-	struct ixgbe_hic_read_shadow_ram buffer;
-
-	buffer.hdr.req.cmd = FW_READ_SHADOW_RAM_CMD;
-	buffer.hdr.req.buf_lenh = 0;
-	buffer.hdr.req.buf_lenl = FW_READ_SHADOW_RAM_LEN;
-	buffer.hdr.req.checksum = FW_DEFAULT_CHECKSUM;
-
-	/* convert offset from words to bytes */
-	buffer.address = cpu_to_be32(offset * 2);
-	/* one word */
-	buffer.length = cpu_to_be16(sizeof(u16));
-
-	status = ixgbe_host_interface_command(hw, &buffer, sizeof(buffer),
-					      IXGBE_HI_COMMAND_TIMEOUT, false);
-	if (status)
-		return status;
-
-	*data = (u16)IXGBE_READ_REG_ARRAY(hw, IXGBE_FLEX_MNG,
-					  FW_NVM_DATA_OFFSET);
-
-	return 0;
-}
-
 /** ixgbe_read_ee_hostif_buffer_X550- Read EEPROM word(s) using hostif
  *  @hw: pointer to hardware structure
  *  @offset: offset of  word in the EEPROM to read
@@ -670,6 +635,7 @@ static s32 ixgbe_read_ee_hostif_data_X550(struct ixgbe_hw *hw, u16 offset,
 static s32 ixgbe_read_ee_hostif_buffer_X550(struct ixgbe_hw *hw,
 					    u16 offset, u16 words, u16 *data)
 {
+	const u32 mask = IXGBE_GSSR_SW_MNG_SM | IXGBE_GSSR_EEP_SM;
 	struct ixgbe_hic_read_shadow_ram buffer;
 	u32 current_word = 0;
 	u16 words_to_read;
@@ -677,7 +643,7 @@ static s32 ixgbe_read_ee_hostif_buffer_X550(struct ixgbe_hw *hw,
 	u32 i;
 
 	/* Take semaphore for the entire operation. */
-	status = hw->mac.ops.acquire_swfw_sync(hw, IXGBE_GSSR_EEP_SM);
+	status = hw->mac.ops.acquire_swfw_sync(hw, mask);
 	if (status) {
 		hw_dbg(hw, "EEPROM read buffer - semaphore failed\n");
 		return status;
@@ -698,10 +664,8 @@ static s32 ixgbe_read_ee_hostif_buffer_X550(struct ixgbe_hw *hw,
 		buffer.address = cpu_to_be32((offset + current_word) * 2);
 		buffer.length = cpu_to_be16(words_to_read * 2);
 
-		status = ixgbe_host_interface_command(hw, &buffer,
-						      sizeof(buffer),
-						      IXGBE_HI_COMMAND_TIMEOUT,
-						      false);
+		status = ixgbe_hic_unlocked(hw, (u32 *)&buffer, sizeof(buffer),
+					    IXGBE_HI_COMMAND_TIMEOUT);
 		if (status) {
 			hw_dbg(hw, "Host interface command failed\n");
 			goto out;
@@ -725,7 +689,7 @@ static s32 ixgbe_read_ee_hostif_buffer_X550(struct ixgbe_hw *hw,
 	}
 
 out:
-	hw->mac.ops.release_swfw_sync(hw, IXGBE_GSSR_EEP_SM);
+	hw->mac.ops.release_swfw_sync(hw, mask);
 	return status;
 }
 
@@ -896,15 +860,32 @@ static s32 ixgbe_calc_eeprom_checksum_X550(struct ixgbe_hw *hw)
  **/
 static s32 ixgbe_read_ee_hostif_X550(struct ixgbe_hw *hw, u16 offset, u16 *data)
 {
-	s32 status = 0;
+	const u32 mask = IXGBE_GSSR_SW_MNG_SM | IXGBE_GSSR_EEP_SM;
+	struct ixgbe_hic_read_shadow_ram buffer;
+	s32 status;
 
-	if (hw->mac.ops.acquire_swfw_sync(hw, IXGBE_GSSR_EEP_SM) == 0) {
-		status = ixgbe_read_ee_hostif_data_X550(hw, offset, data);
-		hw->mac.ops.release_swfw_sync(hw, IXGBE_GSSR_EEP_SM);
-	} else {
-		status = IXGBE_ERR_SWFW_SYNC;
+	buffer.hdr.req.cmd = FW_READ_SHADOW_RAM_CMD;
+	buffer.hdr.req.buf_lenh = 0;
+	buffer.hdr.req.buf_lenl = FW_READ_SHADOW_RAM_LEN;
+	buffer.hdr.req.checksum = FW_DEFAULT_CHECKSUM;
+
+	/* convert offset from words to bytes */
+	buffer.address = cpu_to_be32(offset * 2);
+	/* one word */
+	buffer.length = cpu_to_be16(sizeof(u16));
+
+	status = hw->mac.ops.acquire_swfw_sync(hw, mask);
+	if (status)
+		return status;
+
+	status = ixgbe_hic_unlocked(hw, (u32 *)&buffer, sizeof(buffer),
+				    IXGBE_HI_COMMAND_TIMEOUT);
+	if (!status) {
+		*data = (u16)IXGBE_READ_REG_ARRAY(hw, IXGBE_FLEX_MNG,
+						  FW_NVM_DATA_OFFSET);
 	}
 
+	hw->mac.ops.release_swfw_sync(hw, mask);
 	return status;
 }