Support setting RSS hash function / algo via ethtool Netlink. Like IOCTL we don't validate that the function is within the range known to the kernel. The drivers do a pretty good job validating the inputs, and the IDs are technically "dynamically queried" rather than part of uAPI. Only change should be that in Netlink we don't support user explicitly passing ETH_RSS_HASH_NO_CHANGE (0), if no change is requested the attribute should be absent. The ETH_RSS_HASH_NO_CHANGE is retained in driver-facing API for consistency (not that I see a strong reason for it). Reviewed-by: Gal Pressman Signed-off-by: Jakub Kicinski --- Documentation/netlink/specs/ethtool.yaml | 1 + Documentation/networking/ethtool-netlink.rst | 1 + net/ethtool/rss.c | 12 +++++++++++- 3 files changed, 13 insertions(+), 1 deletion(-) diff --git a/Documentation/netlink/specs/ethtool.yaml b/Documentation/netlink/specs/ethtool.yaml index 1eca88a508a0..0d02d8342e4c 100644 --- a/Documentation/netlink/specs/ethtool.yaml +++ b/Documentation/netlink/specs/ethtool.yaml @@ -2654,6 +2654,7 @@ c-version-name: ethtool-genl-version attributes: - header - context + - hfunc - indir - name: rss-ntf diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst index 27db7540e60e..f6e4439caa94 100644 --- a/Documentation/networking/ethtool-netlink.rst +++ b/Documentation/networking/ethtool-netlink.rst @@ -1999,6 +1999,7 @@ RSS_SET ===================================== ====== ============================== ``ETHTOOL_A_RSS_HEADER`` nested request header ``ETHTOOL_A_RSS_CONTEXT`` u32 context number + ``ETHTOOL_A_RSS_HFUNC`` u32 RSS hash func ``ETHTOOL_A_RSS_INDIR`` binary Indir table bytes ===================================== ====== ============================== diff --git a/net/ethtool/rss.c b/net/ethtool/rss.c index c8db523671de..bc9025cfcf1c 100644 --- a/net/ethtool/rss.c +++ b/net/ethtool/rss.c @@ -475,6 +475,7 @@ void ethtool_rss_notify(struct net_device *dev, u32 rss_context) const struct nla_policy ethnl_rss_set_policy[ETHTOOL_A_RSS_START_CONTEXT + 1] = { [ETHTOOL_A_RSS_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy), [ETHTOOL_A_RSS_CONTEXT] = { .type = NLA_U32, }, + [ETHTOOL_A_RSS_HFUNC] = NLA_POLICY_MIN(NLA_U32, 1), [ETHTOOL_A_RSS_INDIR] = { .type = NLA_BINARY, }, }; @@ -489,6 +490,9 @@ ethnl_rss_set_validate(struct ethnl_req_info *req_info, struct genl_info *info) if (request->rss_context && !ops->create_rxfh_context) bad_attr = bad_attr ?: tb[ETHTOOL_A_RSS_CONTEXT]; + if (request->rss_context && !ops->rxfh_per_ctx_key) + bad_attr = bad_attr ?: tb[ETHTOOL_A_RSS_HFUNC]; + if (bad_attr) { NL_SET_BAD_ATTR(info->extack, bad_attr); return -EOPNOTSUPP; @@ -588,6 +592,8 @@ rss_set_ctx_update(struct ethtool_rxfh_context *ctx, struct nlattr **tb, ethtool_rxfh_context_indir(ctx)[i] = rxfh->indir[i]; ctx->indir_configured = !!nla_len(tb[ETHTOOL_A_RSS_INDIR]); } + if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE) + ctx->hfunc = rxfh->hfunc; } static int @@ -618,7 +624,11 @@ ethnl_rss_set(struct ethnl_req_info *req_info, struct genl_info *info) goto exit_clean_data; indir_mod = !!tb[ETHTOOL_A_RSS_INDIR]; - rxfh.hfunc = ETH_RSS_HASH_NO_CHANGE; + rxfh.hfunc = data.hfunc; + ethnl_update_u8(&rxfh.hfunc, tb[ETHTOOL_A_RSS_HFUNC], &mod); + if (rxfh.hfunc == data.hfunc) + rxfh.hfunc = ETH_RSS_HASH_NO_CHANGE; + rxfh.input_xfrm = RXH_XFRM_NO_CHANGE; mutex_lock(&dev->ethtool->rss_lock); -- 2.50.1