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Message-ID: <20200903210022.22774-5-saeedm@nvidia.com>
Date: Thu, 3 Sep 2020 14:00:16 -0700
From: Saeed Mahameed <saeedm@...dia.com>
To: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
CC: <netdev@...r.kernel.org>,
Maxim Mikityanskiy <maximmi@...lanox.com>,
"Saeed Mahameed" <saeedm@...dia.com>
Subject: [net-next 04/10] net/mlx5e: Unify constants for WQE_EMPTY_DS_COUNT
From: Maxim Mikityanskiy <maximmi@...lanox.com>
A constant for the number of DS in an empty WQE (i.e. a WQE without data
segments) is needed in multiple places (normal TX data path, MPWQE in
XDP), but currently we have a constant for XDP and an inline formula in
normal TX. This patch introduces a common constant.
Additionally, mlx5e_xdp_mpwqe_session_start is converted to use struct
assignment, because the code nearby is touched.
Signed-off-by: Maxim Mikityanskiy <maximmi@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
.../net/ethernet/mellanox/mlx5/core/en/txrx.h | 2 ++
.../net/ethernet/mellanox/mlx5/core/en/xdp.c | 13 +++++++-----
.../net/ethernet/mellanox/mlx5/core/en/xdp.h | 21 +++++++------------
.../net/ethernet/mellanox/mlx5/core/en_tx.c | 2 +-
4 files changed, 19 insertions(+), 19 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
index d4ee22789ab0..155b89998891 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
@@ -7,6 +7,8 @@
#include "en.h"
#include <linux/indirect_call_wrapper.h>
+#define MLX5E_TX_WQE_EMPTY_DS_COUNT (sizeof(struct mlx5e_tx_wqe) / MLX5_SEND_WQE_DS)
+
#define INL_HDR_START_SZ (sizeof(((struct mlx5_wqe_eth_seg *)NULL)->inline_hdr.start))
enum mlx5e_icosq_wqe_type {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
index 7fccd2ea7dc9..81cd9a04bcb0 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
@@ -196,16 +196,19 @@ static void mlx5e_xdp_mpwqe_session_start(struct mlx5e_xdpsq *sq)
{
struct mlx5e_xdp_mpwqe *session = &sq->mpwqe;
struct mlx5e_xdpsq_stats *stats = sq->stats;
+ struct mlx5e_tx_wqe *wqe;
u16 pi;
pi = mlx5e_xdpsq_get_next_pi(sq, MLX5E_XDP_MPW_MAX_WQEBBS);
- session->wqe = MLX5E_TX_FETCH_WQE(sq, pi);
-
+ wqe = MLX5E_TX_FETCH_WQE(sq, pi);
net_prefetchw(session->wqe->data);
- session->ds_count = MLX5E_XDP_TX_EMPTY_DS_COUNT;
- session->pkt_count = 0;
- mlx5e_xdp_update_inline_state(sq);
+ *session = (struct mlx5e_xdp_mpwqe) {
+ .wqe = wqe,
+ .ds_count = MLX5E_TX_WQE_EMPTY_DS_COUNT,
+ .pkt_count = 0,
+ .inline_on = mlx5e_xdp_get_inline_state(sq, session->inline_on),
+ };
stats->mpwqe++;
}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
index 615bf04f4a54..96d6b1553bab 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
@@ -38,9 +38,7 @@
#include "en/txrx.h"
#define MLX5E_XDP_MIN_INLINE (ETH_HLEN + VLAN_HLEN)
-#define MLX5E_XDP_TX_EMPTY_DS_COUNT \
- (sizeof(struct mlx5e_tx_wqe) / MLX5_SEND_WQE_DS)
-#define MLX5E_XDP_TX_DS_COUNT (MLX5E_XDP_TX_EMPTY_DS_COUNT + 1 /* SG DS */)
+#define MLX5E_XDP_TX_DS_COUNT (MLX5E_TX_WQE_EMPTY_DS_COUNT + 1 /* SG DS */)
#define MLX5E_XDP_INLINE_WQE_MAX_DS_CNT 16
#define MLX5E_XDP_INLINE_WQE_SZ_THRSD \
@@ -123,23 +121,20 @@ static inline void mlx5e_xmit_xdp_doorbell(struct mlx5e_xdpsq *sq)
/* Enable inline WQEs to shift some load from a congested HCA (HW) to
* a less congested cpu (SW).
*/
-static inline void mlx5e_xdp_update_inline_state(struct mlx5e_xdpsq *sq)
+static inline bool mlx5e_xdp_get_inline_state(struct mlx5e_xdpsq *sq, bool cur)
{
u16 outstanding = sq->xdpi_fifo_pc - sq->xdpi_fifo_cc;
- struct mlx5e_xdp_mpwqe *session = &sq->mpwqe;
#define MLX5E_XDP_INLINE_WATERMARK_LOW 10
#define MLX5E_XDP_INLINE_WATERMARK_HIGH 128
- if (session->inline_on) {
- if (outstanding <= MLX5E_XDP_INLINE_WATERMARK_LOW)
- session->inline_on = 0;
- return;
- }
+ if (cur && outstanding <= MLX5E_XDP_INLINE_WATERMARK_LOW)
+ return false;
+
+ if (!cur && outstanding >= MLX5E_XDP_INLINE_WATERMARK_HIGH)
+ return true;
- /* inline is false */
- if (outstanding >= MLX5E_XDP_INLINE_WATERMARK_HIGH)
- session->inline_on = 1;
+ return cur;
}
static inline bool mlx5e_xdp_mpqwe_is_full(struct mlx5e_xdp_mpwqe *session)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
index f967bc0573c0..46bdbbbfaf65 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
@@ -289,7 +289,7 @@ static inline void mlx5e_sq_calc_wqe_attr(struct sk_buff *skb,
const struct mlx5e_tx_attr *attr,
struct mlx5e_tx_wqe_attr *wqe_attr)
{
- u16 ds_cnt = sizeof(struct mlx5e_tx_wqe) / MLX5_SEND_WQE_DS;
+ u16 ds_cnt = MLX5E_TX_WQE_EMPTY_DS_COUNT;
u16 ds_cnt_inl = 0;
ds_cnt += !!attr->headlen + skb_shinfo(skb)->nr_frags;
--
2.26.2
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