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Date: Tue, 17 Oct 2023 10:21:31 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: Ivan Vecera <ivecera@...hat.com>, <netdev@...r.kernel.org>
CC: Jesse Brandeburg <jesse.brandeburg@...el.com>,
Tony Nguyen <anthony.l.nguyen@...el.com>,
"David S . Miller" <davem@...emloft.net>,
"Eric Dumazet" <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
<linux-kernel@...r.kernel.org>, <intel-wired-lan@...ts.osuosl.org>
Subject: Re: [PATCH net-next 4/5] i40e: Refactor and rename
i40e_read_pba_string()
On 10/13/2023 10:07 AM, Ivan Vecera wrote:
> Function i40e_read_pba_string() is currently unused but will be used
> by subsequent patch to provide board ID via devlink device info.
>
> The function reads PBA block from NVM so it cannot be called during
> adapter reset and as we would like to provide PBA ID via devlink
> info it is better to read the PBA ID during i40e_probe() and cache
> it in i40e_hw structure to avoid a waiting for potential adapter
> reset in devlink info callback.
>
> So...
> - Remove pba_num and pba_num_size arguments from the function,
> allocate resource managed buffer to store PBA ID string and
> save resulting pointer to i40e_hw->pba_id field
> - Make the function void as the PBA ID can be missing and in this
> case (or in case of NVM reading failure) the i40e_hw->pba_id
> will be NULL
> - Rename the function to i40e_get_pba_string() to align with other
> functions like i40e_get_oem_version() i40e_get_port_mac_addr()...
> - Call this function on init during i40e_probe()
>
And the PBA value shouldn't be changing even with a new NVM image
flashed to the device, so its not something that is likely to have
updated at run time, thus saving during probe is sufficient.
Makes sense.
Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
> Signed-off-by: Ivan Vecera <ivecera@...hat.com>
> ---
> drivers/net/ethernet/intel/i40e/i40e_common.c | 58 +++++++++++--------
> drivers/net/ethernet/intel/i40e/i40e_main.c | 1 +
> .../net/ethernet/intel/i40e/i40e_prototype.h | 3 +-
> drivers/net/ethernet/intel/i40e/i40e_type.h | 3 +
> 4 files changed, 39 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
> index 6d1042ca0317..04db9cdc7d94 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_common.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
> @@ -821,62 +821,72 @@ void i40e_pre_tx_queue_cfg(struct i40e_hw *hw, u32 queue, bool enable)
> }
>
> /**
> - * i40e_read_pba_string - Reads part number string from EEPROM
> + * i40e_get_pba_string - Reads part number string from EEPROM
> * @hw: pointer to hardware structure
> - * @pba_num: stores the part number string from the EEPROM
> - * @pba_num_size: part number string buffer length
> *
> - * Reads the part number string from the EEPROM.
> + * Reads the part number string from the EEPROM and stores it
> + * into newly allocated buffer and saves resulting pointer
> + * to i40e_hw->pba_id field.
> **/
> -int i40e_read_pba_string(struct i40e_hw *hw, u8 *pba_num,
> - u32 pba_num_size)
> +void i40e_get_pba_string(struct i40e_hw *hw)
> {
> +#define I40E_NVM_PBA_FLAGS_BLK_PRESENT 0xFAFA
> u16 pba_word = 0;
> u16 pba_size = 0;
> u16 pba_ptr = 0;
> - int status = 0;
> - u16 i = 0;
> + int status;
> + char *ptr;
> + u16 i;
>
> status = i40e_read_nvm_word(hw, I40E_SR_PBA_FLAGS, &pba_word);
> - if (status || (pba_word != 0xFAFA)) {
> - hw_dbg(hw, "Failed to read PBA flags or flag is invalid.\n");
> - return status;
> + if (status) {
> + hw_dbg(hw, "Failed to read PBA flags.\n");
> + return;
> + }
> + if (pba_word != I40E_NVM_PBA_FLAGS_BLK_PRESENT) {
> + hw_dbg(hw, "PBA block is not present.\n");
> + return;
> }
>
> status = i40e_read_nvm_word(hw, I40E_SR_PBA_BLOCK_PTR, &pba_ptr);
> if (status) {
> hw_dbg(hw, "Failed to read PBA Block pointer.\n");
> - return status;
> + return;
> }
>
> status = i40e_read_nvm_word(hw, pba_ptr, &pba_size);
> if (status) {
> hw_dbg(hw, "Failed to read PBA Block size.\n");
> - return status;
> + return;
> }
>
> /* Subtract one to get PBA word count (PBA Size word is included in
> - * total size)
> + * total size) and advance pointer to first PBA word.
> */
> pba_size--;
> - if (pba_num_size < (((u32)pba_size * 2) + 1)) {
> - hw_dbg(hw, "Buffer too small for PBA data.\n");
> - return -EINVAL;
> + pba_ptr++;
> + if (!pba_size) {
> + hw_dbg(hw, "PBA ID is empty.\n");
> + return;
> }
>
> + ptr = devm_kzalloc(i40e_hw_to_dev(hw), pba_size * 2 + 1, GFP_KERNEL);
> + if (!ptr)
> + return;
> + hw->pba_id = ptr;
> +
> for (i = 0; i < pba_size; i++) {
> - status = i40e_read_nvm_word(hw, (pba_ptr + 1) + i, &pba_word);
> + status = i40e_read_nvm_word(hw, pba_ptr + i, &pba_word);
> if (status) {
> hw_dbg(hw, "Failed to read PBA Block word %d.\n", i);
> - return status;
> + devm_kfree(i40e_hw_to_dev(hw), hw->pba_id);
> + hw->pba_id = NULL;
> + return;
> }
>
> - pba_num[(i * 2)] = (pba_word >> 8) & 0xFF;
> - pba_num[(i * 2) + 1] = pba_word & 0xFF;
> + *ptr++ = (pba_word >> 8) & 0xFF;
> + *ptr++ = pba_word & 0xFF;
> }
> - pba_num[(pba_size * 2)] = '\0';
> -
> - return status;
> }
>
> /**
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
> index ba8fb0556216..3157d14d9b12 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
> @@ -15846,6 +15846,7 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> goto err_pf_reset;
> }
> i40e_get_oem_version(hw);
> + i40e_get_pba_string(hw);
>
> /* provide nvm, fw, api versions, vendor:device id, subsys vendor:device id */
> i40e_nvm_version_str(hw, nvm_ver, sizeof(nvm_ver));
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_prototype.h b/drivers/net/ethernet/intel/i40e/i40e_prototype.h
> index 46b9a05ceb91..001162042050 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_prototype.h
> +++ b/drivers/net/ethernet/intel/i40e/i40e_prototype.h
> @@ -341,8 +341,7 @@ i40e_aq_configure_partition_bw(struct i40e_hw *hw,
> struct i40e_aqc_configure_partition_bw_data *bw_data,
> struct i40e_asq_cmd_details *cmd_details);
> int i40e_get_port_mac_addr(struct i40e_hw *hw, u8 *mac_addr);
> -int i40e_read_pba_string(struct i40e_hw *hw, u8 *pba_num,
> - u32 pba_num_size);
> +void i40e_get_pba_string(struct i40e_hw *hw);
> void i40e_pre_tx_queue_cfg(struct i40e_hw *hw, u32 queue, bool enable);
> /* prototype for functions used for NVM access */
> int i40e_init_nvm(struct i40e_hw *hw);
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_type.h b/drivers/net/ethernet/intel/i40e/i40e_type.h
> index dc7cd16ad8fb..aff6dc6afbe2 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_type.h
> +++ b/drivers/net/ethernet/intel/i40e/i40e_type.h
> @@ -493,6 +493,9 @@ struct i40e_hw {
> struct i40e_nvm_info nvm;
> struct i40e_fc_info fc;
>
> + /* PBA ID */
> + const char *pba_id;
> +
> /* pci info */
> u16 device_id;
> u16 vendor_id;
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