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net: ethtool: only allow set_rxnfc with rss + ring_cookie if driver opts in

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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 <ecree.xilinx@gmail.com>
Reviewed-by: Martin Habets <habetsm.xilinx@gmail.com>
Link: https://patch.msgid.link/cc3da0844083b0e301a33092a6299e4042b65221.1731499022.git.ecree.xilinx@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Edward Cree 2024-11-13 12:13:09 +00:00 • committed by Jakub Kicinski
parent b52a8deea5
commit 9e43ad7a1e
4 changed files with 11 additions and 0 deletions
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1
drivers/net/ethernet/sfc/ef100_ethtool.c
View file

@ -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,

1
drivers/net/ethernet/sfc/ethtool.c
View file

@ -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,

4
include/linux/ethtool.h
View file

@ -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;

5
net/ethtool/ioctl.c
View file

@ -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 = {};