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Message-ID: <20190524093431.20887-9-maximmi@mellanox.com>
Date: Fri, 24 May 2019 09:35:27 +0000
From: Maxim Mikityanskiy <maximmi@...lanox.com>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Björn Töpel <bjorn.topel@...el.com>,
Magnus Karlsson <magnus.karlsson@...el.com>
CC: "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"David S. Miller" <davem@...emloft.net>,
Saeed Mahameed <saeedm@...lanox.com>,
Jonathan Lemon <bsd@...com>,
Tariq Toukan <tariqt@...lanox.com>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
Jakub Kicinski <jakub.kicinski@...ronome.com>,
Maciej Fijalkowski <maciejromanfijalkowski@...il.com>,
Maxim Mikityanskiy <maximmi@...lanox.com>
Subject: [PATCH bpf-next v3 08/16] net/mlx5e: Calculate linear RX frag size
considering XSK
Additional conditions introduced:
- XSK implies XDP.
- Headroom includes the XSK headroom if it exists.
- No space is reserved for struct shared_skb_info in XSK mode.
- Fragment size smaller than the XSK chunk size is not allowed.
A new auxiliary function mlx5e_get_linear_rq_headroom with the support
for XSK is introduced. Use this function in the implementation of
mlx5e_get_rq_headroom. Change headroom to u32 to match the headroom
field in struct xdp_umem.
Signed-off-by: Maxim Mikityanskiy <maximmi@...lanox.com>
Reviewed-by: Tariq Toukan <tariqt@...lanox.com>
Acked-by: Saeed Mahameed <saeedm@...lanox.com>
---
.../ethernet/mellanox/mlx5/core/en/params.c | 65 +++++++++++++------
.../ethernet/mellanox/mlx5/core/en/params.h | 8 ++-
.../net/ethernet/mellanox/mlx5/core/en_main.c | 2 +-
3 files changed, 52 insertions(+), 23 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
index d3744bffbae3..50a458dc3836 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
@@ -3,33 +3,62 @@
#include "en/params.h"
-u32 mlx5e_rx_get_linear_frag_sz(struct mlx5e_params *params)
+static inline bool mlx5e_rx_is_xdp(struct mlx5e_params *params,
+ struct mlx5e_xsk_param *xsk)
{
- u16 hw_mtu = MLX5E_SW2HW_MTU(params, params->sw_mtu);
- u16 linear_rq_headroom = params->xdp_prog ?
- XDP_PACKET_HEADROOM : MLX5_RX_HEADROOM;
- u32 frag_sz;
+ return params->xdp_prog || xsk;
+}
+
+static inline u16 mlx5e_get_linear_rq_headroom(struct mlx5e_params *params,
+ struct mlx5e_xsk_param *xsk)
+{
+ u16 headroom = NET_IP_ALIGN;
+
+ if (mlx5e_rx_is_xdp(params, xsk)) {
+ headroom += XDP_PACKET_HEADROOM;
+ if (xsk)
+ headroom += xsk->headroom;
+ } else {
+ headroom += MLX5_RX_HEADROOM;
+ }
+
+ return headroom;
+}
+
+u32 mlx5e_rx_get_linear_frag_sz(struct mlx5e_params *params,
+ struct mlx5e_xsk_param *xsk)
+{
+ u32 hw_mtu = MLX5E_SW2HW_MTU(params, params->sw_mtu);
+ u16 linear_rq_headroom = mlx5e_get_linear_rq_headroom(params, xsk);
+ u32 frag_sz = linear_rq_headroom + hw_mtu;
- linear_rq_headroom += NET_IP_ALIGN;
+ /* AF_XDP doesn't build SKBs in place. */
+ if (!xsk)
+ frag_sz = MLX5_SKB_FRAG_SZ(frag_sz);
- frag_sz = MLX5_SKB_FRAG_SZ(linear_rq_headroom + hw_mtu);
+ /* XDP in mlx5e doesn't support multiple packets per page. */
+ if (mlx5e_rx_is_xdp(params, xsk))
+ frag_sz = max_t(u32, frag_sz, PAGE_SIZE);
- if (params->xdp_prog && frag_sz < PAGE_SIZE)
- frag_sz = PAGE_SIZE;
+ /* Even if we can go with a smaller fragment size, we must not put
+ * multiple packets into a single frame.
+ */
+ if (xsk)
+ frag_sz = max_t(u32, frag_sz, xsk->chunk_size);
return frag_sz;
}
u8 mlx5e_mpwqe_log_pkts_per_wqe(struct mlx5e_params *params)
{
- u32 linear_frag_sz = mlx5e_rx_get_linear_frag_sz(params);
+ u32 linear_frag_sz = mlx5e_rx_get_linear_frag_sz(params, NULL);
return MLX5_MPWRQ_LOG_WQE_SZ - order_base_2(linear_frag_sz);
}
bool mlx5e_rx_is_linear_skb(struct mlx5e_params *params)
{
- u32 frag_sz = mlx5e_rx_get_linear_frag_sz(params);
+ u32 frag_sz = mlx5e_rx_get_linear_frag_sz(params, NULL);
return !params->lro_en && frag_sz <= PAGE_SIZE;
}
@@ -39,7 +68,7 @@ bool mlx5e_rx_is_linear_skb(struct mlx5e_params *params)
bool mlx5e_rx_mpwqe_is_linear_skb(struct mlx5_core_dev *mdev,
struct mlx5e_params *params)
{
- u32 frag_sz = mlx5e_rx_get_linear_frag_sz(params);
+ u32 frag_sz = mlx5e_rx_get_linear_frag_sz(params, NULL);
s8 signed_log_num_strides_param;
u8 log_num_strides;
@@ -75,7 +104,7 @@ u8 mlx5e_mpwqe_get_log_stride_size(struct mlx5_core_dev *mdev,
struct mlx5e_params *params)
{
if (mlx5e_rx_mpwqe_is_linear_skb(mdev, params))
- return order_base_2(mlx5e_rx_get_linear_frag_sz(params));
+ return order_base_2(mlx5e_rx_get_linear_frag_sz(params, NULL));
return MLX5_MPWRQ_DEF_LOG_STRIDE_SZ(mdev);
}
@@ -90,15 +119,9 @@ u8 mlx5e_mpwqe_get_log_num_strides(struct mlx5_core_dev *mdev,
u16 mlx5e_get_rq_headroom(struct mlx5_core_dev *mdev,
struct mlx5e_params *params)
{
- u16 linear_rq_headroom = params->xdp_prog ?
- XDP_PACKET_HEADROOM : MLX5_RX_HEADROOM;
- bool is_linear_skb;
-
- linear_rq_headroom += NET_IP_ALIGN;
-
- is_linear_skb = (params->rq_wq_type == MLX5_WQ_TYPE_CYCLIC) ?
+ bool is_linear_skb = (params->rq_wq_type == MLX5_WQ_TYPE_CYCLIC) ?
mlx5e_rx_is_linear_skb(params) :
mlx5e_rx_mpwqe_is_linear_skb(mdev, params);
- return is_linear_skb ? linear_rq_headroom : 0;
+ return is_linear_skb ? mlx5e_get_linear_rq_headroom(params, NULL) : 0;
}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.h b/drivers/net/ethernet/mellanox/mlx5/core/en/params.h
index b106a0236f36..ed420f3efe52 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/params.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.h
@@ -6,7 +6,13 @@
#include "en.h"
-u32 mlx5e_rx_get_linear_frag_sz(struct mlx5e_params *params);
+struct mlx5e_xsk_param {
+ u16 headroom;
+ u16 chunk_size;
+};
+
+u32 mlx5e_rx_get_linear_frag_sz(struct mlx5e_params *params,
+ struct mlx5e_xsk_param *xsk);
u8 mlx5e_mpwqe_log_pkts_per_wqe(struct mlx5e_params *params);
bool mlx5e_rx_is_linear_skb(struct mlx5e_params *params);
bool mlx5e_rx_mpwqe_is_linear_skb(struct mlx5_core_dev *mdev,
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 457cc39423f2..204e199b141e 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -1955,7 +1955,7 @@ static void mlx5e_build_rq_frags_info(struct mlx5_core_dev *mdev,
if (mlx5e_rx_is_linear_skb(params)) {
int frag_stride;
- frag_stride = mlx5e_rx_get_linear_frag_sz(params);
+ frag_stride = mlx5e_rx_get_linear_frag_sz(params, NULL);
frag_stride = roundup_pow_of_two(frag_stride);
info->arr[0].frag_size = byte_count;
--
2.19.1
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