drivers/net/ethernet/intel/ice/ice_nvm.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/intel/ice/ice_nvm.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/intel/ice/ice_nvm.c
Extension
.c
Size
39580 bytes
Lines
1340
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (status) {
			ice_debug(hw, ICE_DBG_INIT, "Failed to read TLV type.\n");
			break;
		}
		/* Read TLV length */
		status = ice_read_sr_word(hw, next_tlv + 1, &tlv_len);
		if (status) {
			ice_debug(hw, ICE_DBG_INIT, "Failed to read TLV length.\n");
			break;
		}
		if (tlv_sub_module_type == module_type) {
			if (tlv_len) {
				*module_tlv = next_tlv;
				*module_tlv_len = tlv_len;
				return 0;
			}
			return -EINVAL;
		}

		if (check_add_overflow(next_tlv, 2, &next_tlv) ||
		    check_add_overflow(next_tlv, tlv_len, &next_tlv)) {
			dev_warn(ice_hw_to_dev(hw), "TLV of type %u and length 0x%04x caused 16-bit arithmetic overflow. The PFA starts at 0x%04x and has length of 0x%04x\n",
				 tlv_sub_module_type, tlv_len, pfa_ptr, pfa_len);
			return -EINVAL;
		}
	}
	/* Module does not exist */
	return -ENOENT;
}

/**
 * ice_read_pba_string - Reads part number string from NVM
 * @hw: pointer to hardware structure
 * @pba_num: stores the part number string from the NVM
 * @pba_num_size: part number string buffer length
 *
 * Reads the part number string from the NVM.
 */
int ice_read_pba_string(struct ice_hw *hw, u8 *pba_num, u32 pba_num_size)
{
	u16 pba_tlv, pba_tlv_len;
	u16 pba_word, pba_size;
	int status;
	u16 i;

	status = ice_get_pfa_module_tlv(hw, &pba_tlv, &pba_tlv_len,
					ICE_SR_PBA_BLOCK_PTR);
	if (status) {
		ice_debug(hw, ICE_DBG_INIT, "Failed to read PBA Block TLV.\n");
		return status;
	}

	/* pba_size is the next word */
	status = ice_read_sr_word(hw, (pba_tlv + 2), &pba_size);
	if (status) {
		ice_debug(hw, ICE_DBG_INIT, "Failed to read PBA Section size.\n");
		return status;
	}

	if (pba_tlv_len < pba_size) {
		ice_debug(hw, ICE_DBG_INIT, "Invalid PBA Block TLV size.\n");
		return -EINVAL;
	}

	/* Subtract one to get PBA word count (PBA Size word is included in
	 * total size)
	 */
	pba_size--;
	if (pba_num_size < (((u32)pba_size * 2) + 1)) {
		ice_debug(hw, ICE_DBG_INIT, "Buffer too small for PBA data.\n");
		return -EINVAL;
	}

	for (i = 0; i < pba_size; i++) {
		status = ice_read_sr_word(hw, (pba_tlv + 2 + 1) + i, &pba_word);
		if (status) {
			ice_debug(hw, ICE_DBG_INIT, "Failed to read PBA Block word %d.\n", i);
			return status;
		}

		pba_num[(i * 2)] = (pba_word >> 8) & 0xFF;
		pba_num[(i * 2) + 1] = pba_word & 0xFF;
	}
	pba_num[(pba_size * 2)] = '\0';

	return status;
}

/**
 * ice_get_nvm_ver_info - Read NVM version information

Annotation

Implementation Notes