From: Edward Cree Date: Tue, 27 Mar 2018 16:44:21 +0000 (+0100) Subject: sfc: return a better error if filter insertion collides with MC reboot X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=31b842955211f427a099f78a6a63d18a6bbc8d55;p=linux.git sfc: return a better error if filter insertion collides with MC reboot If some other operation gets the MCDI lock ahead of us and performs an MC reboot, then our attempt to insert the filter will fail with EINVAL, because the destination VI (spec->dmaq_id, MC_CMD_FILTER_OP_IN_RX_QUEUE) does not exist. But the caller's request (which might e.g. be an ethtool ntuple request from userland) isn't invalid, it just got unlucky; so return EAGAIN. Signed-off-by: Edward Cree Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c index 9db1b9144e708..9a139c3900372 100644 --- a/drivers/net/ethernet/sfc/ef10.c +++ b/drivers/net/ethernet/sfc/ef10.c @@ -4301,6 +4301,7 @@ static s32 efx_ef10_filter_insert(struct efx_nic *efx, bool replace_equal) { DECLARE_BITMAP(mc_rem_map, EFX_EF10_FILTER_SEARCH_LIMIT); + struct efx_ef10_nic_data *nic_data = efx->nic_data; struct efx_ef10_filter_table *table; struct efx_filter_spec *saved_spec; struct efx_rss_context *ctx = NULL; @@ -4427,6 +4428,12 @@ static s32 efx_ef10_filter_insert(struct efx_nic *efx, rc = efx_ef10_filter_push(efx, spec, &table->entry[ins_index].handle, ctx, replacing); + if (rc == -EINVAL && nic_data->must_realloc_vis) + /* The MC rebooted under us, causing it to reject our filter + * insertion as pointing to an invalid VI (spec->dmaq_id). + */ + rc = -EAGAIN; + /* Finalise the software table entry */ if (rc == 0) { if (replacing) {