On Wed, Nov 13, 2024 at 12:13:09PM +0000, [email protected] wrote: > > From: Edward Cree <[email protected]> > > Ethtool ntuple filters with FLOW_RSS were originally defined as adding > the base queue ID (ring_cookie) to the value from the indirection table, > so that the same table could distribute over more than one set of queues > when used by different filters. > However, some drivers / hardware ignore the ring_cookie, and simply use > the indirection table entries as queue IDs directly. Thus, for drivers > which have not opted in by setting ethtool_ops.cap_rss_rxnfc_adds to > declare that they support the original (addition) semantics, reject in > ethtool_set_rxnfc any filter which combines FLOW_RSS and a nonzero ring. > (For a ring_cookie of zero, both behaviours are equivalent.) > Set the cap bit in sfc, as it is known to support this feature. > > Signed-off-by: Edward Cree <[email protected]>
Reviewed-by: Martin Habets <[email protected]> > --- > drivers/net/ethernet/sfc/ef100_ethtool.c | 1 + > drivers/net/ethernet/sfc/ethtool.c | 1 + > include/linux/ethtool.h | 4 ++++ > net/ethtool/ioctl.c | 5 +++++ > 4 files changed, 11 insertions(+) > > diff --git a/drivers/net/ethernet/sfc/ef100_ethtool.c > b/drivers/net/ethernet/sfc/ef100_ethtool.c > index 5c2551369812..6c3b74000d3b 100644 > --- a/drivers/net/ethernet/sfc/ef100_ethtool.c > +++ b/drivers/net/ethernet/sfc/ef100_ethtool.c > @@ -59,6 +59,7 @@ const struct ethtool_ops ef100_ethtool_ops = { > .get_rxfh_indir_size = efx_ethtool_get_rxfh_indir_size, > .get_rxfh_key_size = efx_ethtool_get_rxfh_key_size, > .rxfh_per_ctx_key = true, > + .cap_rss_rxnfc_adds = true, > .rxfh_priv_size = sizeof(struct efx_rss_context_priv), > .get_rxfh = efx_ethtool_get_rxfh, > .set_rxfh = efx_ethtool_set_rxfh, > diff --git a/drivers/net/ethernet/sfc/ethtool.c > b/drivers/net/ethernet/sfc/ethtool.c > index bb1930818beb..83d715544f7f 100644 > --- a/drivers/net/ethernet/sfc/ethtool.c > +++ b/drivers/net/ethernet/sfc/ethtool.c > @@ -263,6 +263,7 @@ const struct ethtool_ops efx_ethtool_ops = { > .get_rxfh_indir_size = efx_ethtool_get_rxfh_indir_size, > .get_rxfh_key_size = efx_ethtool_get_rxfh_key_size, > .rxfh_per_ctx_key = true, > + .cap_rss_rxnfc_adds = true, > .rxfh_priv_size = sizeof(struct efx_rss_context_priv), > .get_rxfh = efx_ethtool_get_rxfh, > .set_rxfh = efx_ethtool_set_rxfh, > diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h > index 1199e308c8dd..299280c94d07 100644 > --- a/include/linux/ethtool.h > +++ b/include/linux/ethtool.h > @@ -734,6 +734,9 @@ struct kernel_ethtool_ts_info { > * @rxfh_per_ctx_key: device supports setting different RSS key for each > * additional context. Netlink API should report hfunc, key, and input_xfrm > * for every context, not just context 0. > + * @cap_rss_rxnfc_adds: device supports nonzero ring_cookie in filters with > + * %FLOW_RSS flag; the queue ID from the filter is added to the value from > + * the indirection table to determine the delivery queue. > * @rxfh_indir_space: max size of RSS indirection tables, if indirection > table > * size as returned by @get_rxfh_indir_size may change during lifetime > * of the device. Leave as 0 if the table size is constant. > @@ -956,6 +959,7 @@ struct ethtool_ops { > u32 cap_rss_ctx_supported:1; > u32 cap_rss_sym_xor_supported:1; > u32 rxfh_per_ctx_key:1; > + u32 cap_rss_rxnfc_adds:1; > u32 rxfh_indir_space; > u16 rxfh_key_space; > u16 rxfh_priv_size; > diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c > index 7da94e26ced6..d86399bcf223 100644 > --- a/net/ethtool/ioctl.c > +++ b/net/ethtool/ioctl.c > @@ -992,6 +992,11 @@ static noinline_for_stack int ethtool_set_rxnfc(struct > net_device *dev, > if (rc) > return rc; > > + /* Nonzero ring with RSS only makes sense if NIC adds them together */ > + if (info.flow_type & FLOW_RSS && !ops->cap_rss_rxnfc_adds && > + ethtool_get_flow_spec_ring(info.fs.ring_cookie)) > + return -EINVAL; > + > if (ops->get_rxfh) { > struct ethtool_rxfh_param rxfh = {}; >
