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Date: Thu, 18 Jun 2020 09:09:26 -0700
From: Jonathan Lemon <jonathan.lemon@...il.com>
To: <netdev@...r.kernel.org>
CC: <kernel-team@...com>, <axboe@...nel.dk>
Subject: [RFC PATCH 06/21] mlx5: add header_split flag
Adds a "rx_hd_split" private flag parameter to ethtool.
This enables header splitting, and sets up the fragment mappings.
The feature is currently only enabled for netgpu channels.
Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>
---
.../ethernet/mellanox/mlx5/core/en_ethtool.c | 15 +++++++
.../net/ethernet/mellanox/mlx5/core/en_main.c | 45 +++++++++++++++----
2 files changed, 52 insertions(+), 8 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
index ec5658bbe3c5..a1b5d8b33b0b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
@@ -1905,6 +1905,20 @@ static int set_pflag_xdp_tx_mpwqe(struct net_device *netdev, bool enable)
return err;
}
+static int set_pflag_rx_hd_split(struct net_device *netdev, bool enable)
+{
+ struct mlx5e_priv *priv = netdev_priv(netdev);
+ int err;
+
+ priv->channels.params.hd_split = enable;
+ err = mlx5e_safe_reopen_channels(priv);
+ if (err)
+ netdev_err(priv->netdev,
+ "%s failed to reopen channels, err(%d).\n",
+ __func__, err);
+ return err;
+}
+
static const struct pflag_desc mlx5e_priv_flags[MLX5E_NUM_PFLAGS] = {
{ "rx_cqe_moder", set_pflag_rx_cqe_based_moder },
{ "tx_cqe_moder", set_pflag_tx_cqe_based_moder },
@@ -1912,6 +1926,7 @@ static const struct pflag_desc mlx5e_priv_flags[MLX5E_NUM_PFLAGS] = {
{ "rx_striding_rq", set_pflag_rx_striding_rq },
{ "rx_no_csum_complete", set_pflag_rx_no_csum_complete },
{ "xdp_tx_mpwqe", set_pflag_xdp_tx_mpwqe },
+ { "rx_hd_split", set_pflag_rx_hd_split },
};
static int mlx5e_handle_pflag(struct net_device *netdev,
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index a836a02a2116..cc8d30aa8a33 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -123,7 +123,8 @@ bool mlx5e_striding_rq_possible(struct mlx5_core_dev *mdev,
void mlx5e_set_rq_type(struct mlx5_core_dev *mdev, struct mlx5e_params *params)
{
- params->rq_wq_type = mlx5e_striding_rq_possible(mdev, params) &&
+ params->rq_wq_type = MLX5E_HD_SPLIT(params) ? MLX5_WQ_TYPE_CYCLIC :
+ mlx5e_striding_rq_possible(mdev, params) &&
MLX5E_GET_PFLAG(params, MLX5E_PFLAG_RX_STRIDING_RQ) ?
MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ :
MLX5_WQ_TYPE_CYCLIC;
@@ -323,6 +324,8 @@ static void mlx5e_init_frags_partition(struct mlx5e_rq *rq)
if (prev)
prev->last_in_page = true;
}
+ next_frag.di->netgpu_source =
+ !!frag_info[f].frag_source;
*frag = next_frag;
/* prepare next */
@@ -373,6 +376,8 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
struct mlx5_core_dev *mdev = c->mdev;
void *rqc = rqp->rqc;
void *rqc_wq = MLX5_ADDR_OF(rqc, rqc, wq);
+ bool hd_split = MLX5E_HD_SPLIT(params) && (umem == (void *)0x1);
+ u32 num_xsk_frames = 0;
u32 rq_xdp_ix;
u32 pool_size;
int wq_sz;
@@ -391,9 +396,10 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
rq->mdev = mdev;
rq->hw_mtu = MLX5E_SW2HW_MTU(params, params->sw_mtu);
rq->xdpsq = &c->rq_xdpsq;
- rq->umem = umem;
+ if (xsk)
+ rq->umem = umem;
- if (rq->umem)
+ if (umem)
rq->stats = &c->priv->channel_stats[c->ix].xskrq;
else
rq->stats = &c->priv->channel_stats[c->ix].rq;
@@ -404,14 +410,18 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
rq->xdp_prog = params->xdp_prog;
rq_xdp_ix = rq->ix;
- if (xsk)
+ if (umem)
rq_xdp_ix += params->num_channels * MLX5E_RQ_GROUP_XSK;
err = xdp_rxq_info_reg(&rq->xdp_rxq, rq->netdev, rq_xdp_ix);
if (err < 0)
goto err_rq_wq_destroy;
+ if (umem == (void *)0x1)
+ rq->buff.headroom = 0;
+ else
+ rq->buff.headroom = mlx5e_get_rq_headroom(mdev, params, xsk);
+
rq->buff.map_dir = rq->xdp_prog ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE;
- rq->buff.headroom = mlx5e_get_rq_headroom(mdev, params, xsk);
pool_size = 1 << params->log_rq_mtu_frames;
switch (rq->wq_type) {
@@ -509,6 +519,7 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
rq->wqe.skb_from_cqe = xsk ?
mlx5e_xsk_skb_from_cqe_linear :
+ hd_split ? mlx5e_skb_from_cqe_nonlinear :
mlx5e_rx_is_linear_skb(params, NULL) ?
mlx5e_skb_from_cqe_linear :
mlx5e_skb_from_cqe_nonlinear;
@@ -2035,13 +2046,19 @@ static void mlx5e_build_rq_frags_info(struct mlx5_core_dev *mdev,
int frag_size_max = DEFAULT_FRAG_SIZE;
u32 buf_size = 0;
int i;
+ bool hd_split = MLX5E_HD_SPLIT(params) && xsk;
+
+ if (hd_split)
+ frag_size_max = HD_SPLIT_DEFAULT_FRAG_SIZE;
+ else
+ frag_size_max = DEFAULT_FRAG_SIZE;
#ifdef CONFIG_MLX5_EN_IPSEC
if (MLX5_IPSEC_DEV(mdev))
byte_count += MLX5E_METADATA_ETHER_LEN;
#endif
- if (mlx5e_rx_is_linear_skb(params, xsk)) {
+ if (!hd_split && mlx5e_rx_is_linear_skb(params, xsk)) {
int frag_stride;
frag_stride = mlx5e_rx_get_linear_frag_sz(params, xsk);
@@ -2059,6 +2076,16 @@ static void mlx5e_build_rq_frags_info(struct mlx5_core_dev *mdev,
frag_size_max = PAGE_SIZE;
i = 0;
+
+ if (hd_split) {
+ // Start with one fragment for all headers (implementing HDS)
+ info->arr[0].frag_size = TOTAL_HEADERS;
+ info->arr[0].frag_stride = roundup_pow_of_two(PAGE_SIZE);
+ buf_size += TOTAL_HEADERS;
+ // Now, continue with the payload frags.
+ i = 1;
+ }
+
while (buf_size < byte_count) {
int frag_size = byte_count - buf_size;
@@ -2066,8 +2093,10 @@ static void mlx5e_build_rq_frags_info(struct mlx5_core_dev *mdev,
frag_size = min(frag_size, frag_size_max);
info->arr[i].frag_size = frag_size;
- info->arr[i].frag_stride = roundup_pow_of_two(frag_size);
-
+ info->arr[i].frag_stride = roundup_pow_of_two(hd_split ?
+ PAGE_SIZE :
+ frag_size);
+ info->arr[i].frag_source = hd_split;
buf_size += frag_size;
i++;
}
--
2.24.1
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