[dpdk-stable] [PATCH 19.11] net/ice: fix incorrect EEPROM data

[Christian Ehrhardt]

On Wed, Mar 10, 2021 at 10:20 AM Murphy Yang <murphyx.yang at intel.com> wrote:
>
> [ upstream commit 01186263c2c79b9a22d3f3b1eeec844c6552fdc7 ]
>
> Kernel driver reads EEPROM data from flash but DPDK reads from
> shadow ram. This patch fixes the issue by changing method to get
> EEPROM data from flash.
>
> Fixes: 68a1ab82ad74 ("net/ice: speed up to retrieve EEPROM")
> Cc: stable at dpdk.org

Hi Murphy,
of the 5 patches just submitted in this series this is the only one with
a proper CC: stable at dpdk and a fixes line.

I wanted to ask what the reasoning is for the other four to also be submitted
as 19.11 - they sound more like extending features of the ICE drivers than
fixes that would go into a stable update.

Finally I also wondered that these are only queued for 20.05 which isn't
released yet so this had less tests/discussions so far - that is at least
uncommon to accept them now.

And in regard to that I haven't found the same patches for 20.11. Due to
that accepting them into 19.11 now would cause someone then upgrading
19.11.x -> 20.11.x to degrade.

If you could please outline why the other four changes in this series
are requested
for (19.11 in particular) stable?

Thanks in advance,
Christan


> Signed-off-by: Shougang Wang <shougangx.wang at intel.com>
> ---
>  drivers/net/ice/ice_ethdev.c | 25 +++++++++++--------------
>  1 file changed, 11 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c
> index c2e659303c..efb2d67d54 100644
> --- a/drivers/net/ice/ice_ethdev.c
> +++ b/drivers/net/ice/ice_ethdev.c
> @@ -3984,8 +3984,7 @@ ice_get_eeprom_length(struct rte_eth_dev *dev)
>  {
>         struct ice_hw *hw = ICE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
>
> -       /* Convert word count to byte count */
> -       return hw->nvm.sr_words << 1;
> +       return hw->nvm.flash_size;
>  }
>
>  static int
> @@ -3993,26 +3992,24 @@ ice_get_eeprom(struct rte_eth_dev *dev,
>                struct rte_dev_eeprom_info *eeprom)
>  {
>         struct ice_hw *hw = ICE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> -       uint16_t *data = eeprom->data;
> -       uint16_t first_word, last_word, nwords;
>         enum ice_status status = ICE_SUCCESS;
> +       uint8_t *data = eeprom->data;
>
> -       first_word = eeprom->offset >> 1;
> -       last_word = (eeprom->offset + eeprom->length - 1) >> 1;
> -       nwords = last_word - first_word + 1;
> +       eeprom->magic = hw->vendor_id | (hw->device_id << 16);
>
> -       if (first_word >= hw->nvm.sr_words ||
> -           last_word >= hw->nvm.sr_words) {
> -               PMD_DRV_LOG(ERR, "Requested EEPROM bytes out of range.");
> -               return -EINVAL;
> +       status = ice_acquire_nvm(hw, ICE_RES_READ);
> +       if (status) {
> +               PMD_DRV_LOG(ERR, "acquire nvm failed.");
> +               return -EIO;
>         }
>
> -       eeprom->magic = hw->vendor_id | (hw->device_id << 16);
> +       status = ice_read_flat_nvm(hw, eeprom->offset, &eeprom->length,
> +                                  data, false);
> +
> +       ice_release_nvm(hw);
>
> -       status = ice_read_sr_buf(hw, first_word, &nwords, data);
>         if (status) {
>                 PMD_DRV_LOG(ERR, "EEPROM read failed.");
> -               eeprom->length = sizeof(uint16_t) * nwords;
>                 return -EIO;
>         }
>
> --
> 2.17.1
>


--
Christian Ehrhardt
Staff Engineer, Ubuntu Server
Canonical Ltd