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2020 07:57:28 +0000 To: "Wei Hu (Xavier)" , CC: , , References: <20200117062342.32870-1-huwei013@chinasoftinc.com> From: Andrew Rybchenko Autocrypt: addr=arybchenko@solarflare.com; keydata= mQINBF2681gBEACbdTxu8eLL3UX2oAelsnK9GkeaJeUYSOHPJQpV7RL/iaIskqTwBRnhjXt7 j9UEwGA+omnOmqQMpeQTb/F9Ma2dYE+Hw4/t/1KVjxr3ehFaASvwR4fWJfO4e2l/Rk4rG6Yi 5r6CWU2y8su2654Fr8KFc+cMGOAgKoZTZHZsRy5lHpMlemeF+VZkv8L5sYJWPnsypgqlCG3h v6lbtfZs+QqYbFH6bqoZwBAl5irmxywGR7ZJr1GLUZZ1lfdazSY8r6Vz0/Ip/KVxGu2uxo81 QCsAj0ZsQtwji9Sds/prTiPrIjx8Fc/tfbnAuVuPcnPbczwCJACzQr4q26XATL3kVuZhSBWh 4XfO/EAUuEq5AemUG5DDTM87g7Lp4eT9gMZB6P+rJwWPNWTiV3L7Cn+fO+l9mTPnOqdzBgDe OaulKiNSft1o0DY4bGzOmM2ad2cZt0jfnbMPMTE9zsr6+RFa+M8Ct20o6U1MUE4vP6veErMK of4kZ8PdoMM+Sq1hxMPNtlcVBSP9xMmdSZPlfDYI5VWosOceEcz7XZdjBJKdwKuz70V7eac4 ITSxgNFCTbeJ03zL2MR5s0IvD9ghISAwZ6ieCjU5UATn5+63qpD0nVNLsAdb/UpfvQcKAmvj 0fKlxu/PMVkjBa7/4cfNogYOhWDKUO+1pMaFwvb6/XTo6uMpfQARAQABtCxBbmRyZXcgUnli Y2hlbmtvIDxhcnliY2hlbmtvQHNvbGFyZmxhcmUuY29tPokCVAQTAQoAPhYhBP6NPgcKRj/Y 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10--12.037000-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1010-25172.003 X-MDID: 1579247855-ZHmqLq8uw50f Subject: Re: [dpdk-dev] [PATCH v2] ethdev: fix updating device data when ops pointer is NULL X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 1/17/20 9:23 AM, Wei Hu (Xavier) wrote: > From: "Wei Hu (Xavier)" I think summary is misleading. It is too generic and does not mention VLAN offloads. Consider something like: ethdev: fix VLAN offloads set if no driver callback > Currently, there is a potential problem that changing the content of > dev->data->dev_conf.rxmode.offloads even when the pointer named > dev->dev_ops->vlan_offload_set is NULL in the API function named > rte_eth_dev_set_vlan_offload. Consider to change "when the pointer named dev->dev_ops->vlan_offload_set is NULL in the API function named rte_eth_dev_set_vlan_offload." to "when there is no vlan_offload_set driver callback." > It is a good idea that prevent the side effect and make the API return > success if no change requested. This patch fixes the problem, the detail > information as below: > - Update a local 'dev_offloads' variable, instead of directly updating the > device config data > - if no change requested, "mask == 0", return success > - if change requested, check the 'vlan_offload_set' dev_ops in this stage > - assign the local 'dev_offloads' to 'dev->data->dev_conf.rxmode.offloads' > and call the dev_ops > - On error recover the 'dev->data->dev_conf.rxmode.offloads' to > 'orig_offloads' I see no point to repeat in description what the code does. IMHO it is sufficient to mention main ideas: - keep possibility to do dummy set even if there is no driver callback - do not touch Rx mode offloads in device data before checking the driver callback availability - ensure that Rx mode offloads are rolled back correctly if driver callback returns error > Fixes: 01eb53eefeb4 ("ethdev: rename folder to library name") I think it is wrong Fixes. Rename just moves the code, it is not the changeset which introduces the bug. > Cc: stable@dpdk.org > > Signed-off-by: Wei Hu (Xavier) > Signed-off-by: Chunsong Feng > Signed-off-by: Min Wang (Jushui) > Signed-off-by: Min Hu (Connor) with above notes processed Reviewed-by: Andrew Rybchenko