From 5b4e9a7a71ab912d150cb2276cb23af51c863150 Mon Sep 17 00:00:00 2001 From: Shannon Nelson Date: Fri, 10 Feb 2023 16:50:16 -0800 Subject: [PATCH] net: ethtool: extend ringparam set/get APIs for rx_push Similar to what was done for TX_PUSH, add an RX_PUSH concept to the ethtool interfaces. Signed-off-by: Shannon Nelson Signed-off-by: David S. Miller --- Documentation/networking/ethtool-netlink.rst | 6 ++++-- include/linux/ethtool.h | 4 ++++ include/uapi/linux/ethtool_netlink.h | 1 + net/ethtool/netlink.h | 2 +- net/ethtool/rings.c | 17 +++++++++++++++-- 5 files changed, 25 insertions(+), 5 deletions(-) diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst index d144e89..e1bc618 100644 --- a/Documentation/networking/ethtool-netlink.rst +++ b/Documentation/networking/ethtool-netlink.rst @@ -874,6 +874,7 @@ Kernel response contents: ``ETHTOOL_A_RINGS_TCP_DATA_SPLIT`` u8 TCP header / data split ``ETHTOOL_A_RINGS_CQE_SIZE`` u32 Size of TX/RX CQE ``ETHTOOL_A_RINGS_TX_PUSH`` u8 flag of TX Push mode + ``ETHTOOL_A_RINGS_RX_PUSH`` u8 flag of RX Push mode ==================================== ====== =========================== ``ETHTOOL_A_RINGS_TCP_DATA_SPLIT`` indicates whether the device is usable with @@ -883,8 +884,8 @@ separate buffers. The device configuration must make it possible to receive full memory pages of data, for example because MTU is high enough or through HW-GRO. -``ETHTOOL_A_RINGS_TX_PUSH`` flag is used to enable descriptor fast -path to send packets. In ordinary path, driver fills descriptors in DRAM and +``ETHTOOL_A_RINGS_[RX|TX]_PUSH`` flag is used to enable descriptor fast +path to send or receive packets. In ordinary path, driver fills descriptors in DRAM and notifies NIC hardware. In fast path, driver pushes descriptors to the device through MMIO writes, thus reducing the latency. However, enabling this feature may increase the CPU cost. Drivers may enforce additional per-packet @@ -906,6 +907,7 @@ Request contents: ``ETHTOOL_A_RINGS_RX_BUF_LEN`` u32 size of buffers on the ring ``ETHTOOL_A_RINGS_CQE_SIZE`` u32 Size of TX/RX CQE ``ETHTOOL_A_RINGS_TX_PUSH`` u8 flag of TX Push mode + ``ETHTOOL_A_RINGS_RX_PUSH`` u8 flag of RX Push mode ==================================== ====== =========================== Kernel checks that requested ring sizes do not exceed limits reported by diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h index 515c78d..2792185 100644 --- a/include/linux/ethtool.h +++ b/include/linux/ethtool.h @@ -73,12 +73,14 @@ enum { * @rx_buf_len: Current length of buffers on the rx ring. * @tcp_data_split: Scatter packet headers and data to separate buffers * @tx_push: The flag of tx push mode + * @rx_push: The flag of rx push mode * @cqe_size: Size of TX/RX completion queue event */ struct kernel_ethtool_ringparam { u32 rx_buf_len; u8 tcp_data_split; u8 tx_push; + u8 rx_push; u32 cqe_size; }; @@ -87,11 +89,13 @@ struct kernel_ethtool_ringparam { * @ETHTOOL_RING_USE_RX_BUF_LEN: capture for setting rx_buf_len * @ETHTOOL_RING_USE_CQE_SIZE: capture for setting cqe_size * @ETHTOOL_RING_USE_TX_PUSH: capture for setting tx_push + * @ETHTOOL_RING_USE_RX_PUSH: capture for setting rx_push */ enum ethtool_supported_ring_param { ETHTOOL_RING_USE_RX_BUF_LEN = BIT(0), ETHTOOL_RING_USE_CQE_SIZE = BIT(1), ETHTOOL_RING_USE_TX_PUSH = BIT(2), + ETHTOOL_RING_USE_RX_PUSH = BIT(3), }; #define __ETH_RSS_HASH_BIT(bit) ((u32)1 << (bit)) diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h index ffb073c..d39ce21 100644 --- a/include/uapi/linux/ethtool_netlink.h +++ b/include/uapi/linux/ethtool_netlink.h @@ -356,6 +356,7 @@ enum { ETHTOOL_A_RINGS_TCP_DATA_SPLIT, /* u8 */ ETHTOOL_A_RINGS_CQE_SIZE, /* u32 */ ETHTOOL_A_RINGS_TX_PUSH, /* u8 */ + ETHTOOL_A_RINGS_RX_PUSH, /* u8 */ /* add new constants above here */ __ETHTOOL_A_RINGS_CNT, diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h index ae07324..f7b189e 100644 --- a/net/ethtool/netlink.h +++ b/net/ethtool/netlink.h @@ -413,7 +413,7 @@ extern const struct nla_policy ethnl_features_set_policy[ETHTOOL_A_FEATURES_WANT extern const struct nla_policy ethnl_privflags_get_policy[ETHTOOL_A_PRIVFLAGS_HEADER + 1]; extern const struct nla_policy ethnl_privflags_set_policy[ETHTOOL_A_PRIVFLAGS_FLAGS + 1]; extern const struct nla_policy ethnl_rings_get_policy[ETHTOOL_A_RINGS_HEADER + 1]; -extern const struct nla_policy ethnl_rings_set_policy[ETHTOOL_A_RINGS_TX_PUSH + 1]; +extern const struct nla_policy ethnl_rings_set_policy[ETHTOOL_A_RINGS_RX_PUSH + 1]; extern const struct nla_policy ethnl_channels_get_policy[ETHTOOL_A_CHANNELS_HEADER + 1]; extern const struct nla_policy ethnl_channels_set_policy[ETHTOOL_A_CHANNELS_COMBINED_COUNT + 1]; extern const struct nla_policy ethnl_coalesce_get_policy[ETHTOOL_A_COALESCE_HEADER + 1]; diff --git a/net/ethtool/rings.c b/net/ethtool/rings.c index 2a2d353..f358cd5 100644 --- a/net/ethtool/rings.c +++ b/net/ethtool/rings.c @@ -56,7 +56,8 @@ static int rings_reply_size(const struct ethnl_req_info *req_base, nla_total_size(sizeof(u32)) + /* _RINGS_RX_BUF_LEN */ nla_total_size(sizeof(u8)) + /* _RINGS_TCP_DATA_SPLIT */ nla_total_size(sizeof(u32) + /* _RINGS_CQE_SIZE */ - nla_total_size(sizeof(u8))); /* _RINGS_TX_PUSH */ + nla_total_size(sizeof(u8)) + /* _RINGS_TX_PUSH */ + nla_total_size(sizeof(u8))); /* _RINGS_RX_PUSH */ } static int rings_fill_reply(struct sk_buff *skb, @@ -96,7 +97,8 @@ static int rings_fill_reply(struct sk_buff *skb, kr->tcp_data_split))) || (kr->cqe_size && (nla_put_u32(skb, ETHTOOL_A_RINGS_CQE_SIZE, kr->cqe_size))) || - nla_put_u8(skb, ETHTOOL_A_RINGS_TX_PUSH, !!kr->tx_push)) + nla_put_u8(skb, ETHTOOL_A_RINGS_TX_PUSH, !!kr->tx_push) || + nla_put_u8(skb, ETHTOOL_A_RINGS_RX_PUSH, !!kr->rx_push)) return -EMSGSIZE; return 0; @@ -114,6 +116,7 @@ const struct nla_policy ethnl_rings_set_policy[] = { [ETHTOOL_A_RINGS_RX_BUF_LEN] = NLA_POLICY_MIN(NLA_U32, 1), [ETHTOOL_A_RINGS_CQE_SIZE] = NLA_POLICY_MIN(NLA_U32, 1), [ETHTOOL_A_RINGS_TX_PUSH] = NLA_POLICY_MAX(NLA_U8, 1), + [ETHTOOL_A_RINGS_RX_PUSH] = NLA_POLICY_MAX(NLA_U8, 1), }; static int @@ -147,6 +150,14 @@ ethnl_set_rings_validate(struct ethnl_req_info *req_info, return -EOPNOTSUPP; } + if (tb[ETHTOOL_A_RINGS_RX_PUSH] && + !(ops->supported_ring_params & ETHTOOL_RING_USE_RX_PUSH)) { + NL_SET_ERR_MSG_ATTR(info->extack, + tb[ETHTOOL_A_RINGS_RX_PUSH], + "setting rx push not supported"); + return -EOPNOTSUPP; + } + return ops->get_ringparam && ops->set_ringparam ? 1 : -EOPNOTSUPP; } @@ -176,6 +187,8 @@ ethnl_set_rings(struct ethnl_req_info *req_info, struct genl_info *info) tb[ETHTOOL_A_RINGS_CQE_SIZE], &mod); ethnl_update_u8(&kernel_ringparam.tx_push, tb[ETHTOOL_A_RINGS_TX_PUSH], &mod); + ethnl_update_u8(&kernel_ringparam.rx_push, + tb[ETHTOOL_A_RINGS_RX_PUSH], &mod); if (!mod) return 0; -- 2.7.4