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ice: discover and store size of available flash

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When reading from the NVM using a flat address, it is useful to know the
upper bound on the size of the flash contents. This value is not stored
within the NVM.

We can determine the size by performing a bisection between upper and
lower bounds. It is known that the size cannot exceed 16 MB (offset of
0xFFFFFF).

Use a while loop to bisect the upper and lower bounds by reading one
byte at a time. On a failed read, lower the maximum bound. On
a successful read, increase the lower bound.

Save this as the flash_size in the ice_nvm_info structure that contains
data related to the NVM.

The size will be used in a future patch for implementing full NVM read
via ethtool's GEEPROM command.

The maximum possible size for the flash is bounded by the size limit for
the NVM AdminQ commands. Add a new macro, ICE_AQC_NVM_MAX_OFFSET, which
can be used to represent this upper bound.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Jacob Keller
2020-03-11 18:58:13 -07:00
committed by Jeff Kirsher
parent d4e874448e
commit 81f07491e2
3 changed files with 63 additions and 2 deletions
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2
drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
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@@ -1232,6 +1232,7 @@ struct ice_aqc_sff_eeprom {
* NVM Update commands (indirect 0x0703)
*/
struct ice_aqc_nvm {
#define ICE_AQC_NVM_MAX_OFFSET 0xFFFFFF
__le16 offset_low;
u8 offset_high;
u8 cmd_flags;
@@ -1766,6 +1767,7 @@ enum ice_aq_err {
ICE_AQ_RC_ENOMEM = 9, /* Out of memory */
ICE_AQ_RC_EBUSY = 12, /* Device or resource busy */
ICE_AQ_RC_EEXIST = 13, /* Object already exists */
ICE_AQ_RC_EINVAL = 14, /* Invalid argument */
ICE_AQ_RC_ENOSPC = 16, /* No space left or allocation failure */
ICE_AQ_RC_ENOSYS = 17, /* Function not implemented */
ICE_AQ_RC_ENOSEC = 24, /* Missing security manifest */