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Date: Tue, 09 Feb 2010 14:44:52 +0000
From: Ben Hutchings <bhutchings@...arflare.com>
To: Yevgeny Petrilin <yevgenyp@...lanox.co.il>
Cc: Roland Dreier <rdreier@...co.com>, general@...ts.openfabrics.org,
netdev@...r.kernel.org, liranl@...lanox.co.il,
tziporet@...lanox.co.il
Subject: Re: [PATCH 04/23 v3] mlx4_core: add slave resource allocation
On Thu, 2010-02-04 at 17:54 +0200, Yevgeny Petrilin wrote:
> All QPs/CQs/SRQs/MPTs/MTTs are allocated from shared pools, which are owned by
> the master. In addition, all backing ICM memory for these objects is managed by
> the master.
> To allow slaves to allocate resources, ICM allocation is separated from the rest
> of the object state, which is held at the slave.
> Slaves can then reserve resource ranges and allocate ICM over the comm channel.
>
> Signed-off-by: Liran Liss <liranl@...lanox.co.il>
> Signed-off-by: Yevgeny Petrilin <yevgenyp@...lanox.co.il>
> ---
> drivers/net/mlx4/cmd.c | 110 +++++++++++++++++++++++++++++++++
> drivers/net/mlx4/cq.c | 91 +++++++++++++++++++++-------
> drivers/net/mlx4/mlx4.h | 27 ++++++++
> drivers/net/mlx4/mr.c | 125 ++++++++++++++++++++++++++++++++++----
> drivers/net/mlx4/qp.c | 151 +++++++++++++++++++++++++++++++++-------------
> drivers/net/mlx4/srq.c | 88 ++++++++++++++++++++-------
> include/linux/mlx4/cmd.h | 2 +
> 7 files changed, 496 insertions(+), 98 deletions(-)
>
> diff --git a/drivers/net/mlx4/cmd.c b/drivers/net/mlx4/cmd.c
> index 9e85330..533ce77 100644
> --- a/drivers/net/mlx4/cmd.c
> +++ b/drivers/net/mlx4/cmd.c
> @@ -417,6 +417,100 @@ static int mlx4_ACCESS_MEM(struct mlx4_dev *dev, u64 master_addr,
> MLX4_CMD_TIME_CLASS_A);
> }
>
> +static int mlx4_RESOURCE_wrapper(struct mlx4_dev *dev, int slave, struct mlx4_vhcr *vhcr,
> + struct mlx4_cmd_mailbox *inbox,
> + struct mlx4_cmd_mailbox *outbox)
> +{
> + u32 param1 = *((u32 *) &vhcr->in_param);
> + u32 param2 = *(((u32 *) &vhcr->in_param) + 1);
> + int ret;
> +
> +#if 0
> + char *res[] = {"QP", "CQ", "SRQ", "MPT", "MTT"};
> + mlx4_warn(dev, "resource wrapper - %s (mode: %s) type:%s param1:%d param2:%d\n",
> + vhcr->op == MLX4_CMD_ALLOC_RES ? "allocate" : "free",
> + vhcr->op_modifier == ICM_RESERVE ? "reserve" :
> + (vhcr->op_modifier == ICM_ALLOC ? "alloc" : "reserve+alloc"),
> + res[vhcr->in_modifier], param1, param2);
> +#endif
Either make this really conditional or remove it. '#if 0' is not
useful.
[...]
> diff --git a/drivers/net/mlx4/cq.c b/drivers/net/mlx4/cq.c
> index ccfe276..3fb9f7f 100644
> --- a/drivers/net/mlx4/cq.c
> +++ b/drivers/net/mlx4/cq.c
[...]
> +void mlx4_cq_free_icm(struct mlx4_dev *dev, int cqn)
> +{
> + struct mlx4_priv *priv = mlx4_priv(dev);
> + struct mlx4_cq_table *cq_table = &priv->cq_table;
> + u64 in_param;
> + int err;
> +
> + if (mlx4_is_slave(dev)) {
> + *((u32 *) &in_param) = cqn;
> + *(((u32 *) &in_param) + 1) = 0;
> + err = mlx4_cmd(dev, in_param, RES_CQ, ICM_RESERVE_AND_ALLOC,
> + MLX4_CMD_FREE_RES,
> + MLX4_CMD_TIME_CLASS_A);
This is fairly disgusting, and surely only works for one byte order. I
think you really want:
in_param = cqn;
[...]
> diff --git a/drivers/net/mlx4/mr.c b/drivers/net/mlx4/mr.c
> index 9e4ab0f..0db7f88 100644
> --- a/drivers/net/mlx4/mr.c
> +++ b/drivers/net/mlx4/mr.c
> @@ -178,10 +178,26 @@ static void mlx4_buddy_cleanup(struct mlx4_buddy *buddy)
> kfree(buddy->num_free);
> }
>
> -static u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
> +u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
> {
> struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
> + u64 in_param;
> + u64 out_param;
> u32 seg;
> + int err;
> +
> + if (mlx4_is_slave(dev)) {
> + *((u32 *) &in_param) = order;
> + *(((u32 *) &in_param) + 1) = 0;
> + err = mlx4_cmd_imm(dev, in_param, &out_param, RES_MTT,
> + ICM_RESERVE_AND_ALLOC,
> + MLX4_CMD_ALLOC_RES,
> + MLX4_CMD_TIME_CLASS_A);
Again with the byte-ordering...
> + if (err)
> + return -1;
> + else
> + return out_param;
> + }
>
> seg = mlx4_buddy_alloc(&mr_table->mtt_buddy, order);
> if (seg == -1)
> @@ -219,16 +235,33 @@ int mlx4_mtt_init(struct mlx4_dev *dev, int npages, int page_shift,
> }
> EXPORT_SYMBOL_GPL(mlx4_mtt_init);
>
> -void mlx4_mtt_cleanup(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
> +void mlx4_free_mtt_range(struct mlx4_dev *dev, u32 first_seg, int order)
> {
> struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
> + u64 in_param;
> + int err;
> +
> + if (mlx4_is_slave(dev)) {
> + *((u32 *) &in_param) = first_seg;
> + *(((u32 *) &in_param) + 1) = order;
> + err = mlx4_cmd(dev, in_param, RES_MTT, ICM_RESERVE_AND_ALLOC,
> + MLX4_CMD_FREE_RES,
> + MLX4_CMD_TIME_CLASS_A);
and here:
in_param = first_seg | (u64)order << 32;
[...]
> +void mlx4_mr_release(struct mlx4_dev *dev, u32 index)
> +{
> + struct mlx4_priv *priv = mlx4_priv(dev);
> + u64 in_param;
> + int err;
> +
> + if (mlx4_is_slave(dev)) {
> + *((u32 *) &in_param) = index;
> + *(((u32 *) &in_param) + 1) = 0;
etc. etc.
Ben.
--
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
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