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SubjectRe: [PATCH v2,net] hv_netvsc: Fix tx_table init in rndis_set_subchannel()
On Wed, 11 Dec 2019 14:26:27 -0800, Haiyang Zhang wrote:
> Host can provide send indirection table messages anytime after RSS is
> enabled by calling rndis_filter_set_rss_param(). So the host provided
> table values may be overwritten by the initialization in
> rndis_set_subchannel().
>
> To prevent this problem, move the tx_table initialization before calling
> rndis_filter_set_rss_param().
>
> Fixes: a6fb6aa3cfa9 ("hv_netvsc: Set tx_table to equal weight after subchannels open")
> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>

Applied, but there are two more problems with this code:
- you should not reset the indirection table if it was configured by
the user to something other than the default (use the
netif_is_rxfh_configured() helper to check for that)
- you should use the ethtool_rxfh_indir_default() wrapper

Please fix the former problem in the net tree, and after net is merged
into linux/master and net-next in a week or two please follow up with
the fix for the latter for net-next.

> diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
> index 206b4e7..05bc5ec8 100644
> --- a/drivers/net/hyperv/rndis_filter.c
> +++ b/drivers/net/hyperv/rndis_filter.c
> @@ -1171,6 +1171,9 @@ int rndis_set_subchannel(struct net_device *ndev,
> wait_event(nvdev->subchan_open,
> atomic_read(&nvdev->open_chn) == nvdev->num_chn);
>
> + for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
> + ndev_ctx->tx_table[i] = i % nvdev->num_chn;
> +
> /* ignore failures from setting rss parameters, still have channels */
> if (dev_info)
> rndis_filter_set_rss_param(rdev, dev_info->rss_key);
> @@ -1180,9 +1183,6 @@ int rndis_set_subchannel(struct net_device *ndev,
> netif_set_real_num_tx_queues(ndev, nvdev->num_chn);
> netif_set_real_num_rx_queues(ndev, nvdev->num_chn);
>
> - for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
> - ndev_ctx->tx_table[i] = i % nvdev->num_chn;
> -
> return 0;
> }
>

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