netdev - Re: [PATCH bpf-next v4 07/14] xsk: move addrs from buffer pool to umem

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Date:   Tue, 28 Jul 2020 09:11:47 +0200
From:   Björn Töpel <bjorn.topel@...el.com>
To:     Magnus Karlsson <magnus.karlsson@...el.com>, ast@...nel.org,
        daniel@...earbox.net, netdev@...r.kernel.org,
        jonathan.lemon@...il.com, maximmi@...lanox.com
Cc:     bpf@...r.kernel.org, jeffrey.t.kirsher@...el.com,
        anthony.l.nguyen@...el.com, maciej.fijalkowski@...el.com,
        maciejromanfijalkowski@...il.com, cristian.dumitrescu@...el.com
Subject: Re: [PATCH bpf-next v4 07/14] xsk: move addrs from buffer pool to
 umem

On 2020-07-21 07:04, Magnus Karlsson wrote:
> Replicate the addrs pointer in the buffer pool to the umem. This mapping
> will be the same for all buffer pools sharing the same umem. In the
> buffer pool we leave the addrs pointer for performance reasons.
> 
> Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>

Acked-by: Björn Töpel <bjorn.topel@...el.com>


> ---
>   include/net/xdp_sock.h  |  1 +
>   net/xdp/xdp_umem.c      | 22 ++++++++++++++++++++++
>   net/xdp/xsk_buff_pool.c | 21 ++-------------------
>   3 files changed, 25 insertions(+), 19 deletions(-)
> 
> diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h
> index 9a61d05..126d243 100644
> --- a/include/net/xdp_sock.h
> +++ b/include/net/xdp_sock.h
> @@ -18,6 +18,7 @@ struct xsk_queue;
>   struct xdp_buff;
>   
>   struct xdp_umem {
> +	void *addrs;
>   	u64 size;
>   	u32 headroom;
>   	u32 chunk_size;
> diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
> index a871c75..372998d 100644
> --- a/net/xdp/xdp_umem.c
> +++ b/net/xdp/xdp_umem.c
> @@ -39,11 +39,27 @@ static void xdp_umem_unaccount_pages(struct xdp_umem *umem)
>   	}
>   }
>   
> +static void xdp_umem_addr_unmap(struct xdp_umem *umem)
> +{
> +	vunmap(umem->addrs);
> +	umem->addrs = NULL;
> +}
> +
> +static int xdp_umem_addr_map(struct xdp_umem *umem, struct page **pages,
> +			     u32 nr_pages)
> +{
> +	umem->addrs = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
> +	if (!umem->addrs)
> +		return -ENOMEM;
> +	return 0;
> +}
> +
>   static void xdp_umem_release(struct xdp_umem *umem)
>   {
>   	umem->zc = false;
>   	ida_simple_remove(&umem_ida, umem->id);
>   
> +	xdp_umem_addr_unmap(umem);
>   	xdp_umem_unpin_pages(umem);
>   
>   	xdp_umem_unaccount_pages(umem);
> @@ -193,8 +209,14 @@ static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
>   	if (err)
>   		goto out_account;
>   
> +	err = xdp_umem_addr_map(umem, umem->pgs, umem->npgs);
> +	if (err)
> +		goto out_unpin;
> +
>   	return 0;
>   
> +out_unpin:
> +	xdp_umem_unpin_pages(umem);
>   out_account:
>   	xdp_umem_unaccount_pages(umem);
>   	return err;
> diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
> index dbd913e..c563874 100644
> --- a/net/xdp/xsk_buff_pool.c
> +++ b/net/xdp/xsk_buff_pool.c
> @@ -35,26 +35,11 @@ void xp_del_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs)
>   	spin_unlock_irqrestore(&pool->xsk_tx_list_lock, flags);
>   }
>   
> -static void xp_addr_unmap(struct xsk_buff_pool *pool)
> -{
> -	vunmap(pool->addrs);
> -}
> -
> -static int xp_addr_map(struct xsk_buff_pool *pool,
> -		       struct page **pages, u32 nr_pages)
> -{
> -	pool->addrs = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
> -	if (!pool->addrs)
> -		return -ENOMEM;
> -	return 0;
> -}
> -
>   void xp_destroy(struct xsk_buff_pool *pool)
>   {
>   	if (!pool)
>   		return;
>   
> -	xp_addr_unmap(pool);
>   	kvfree(pool->heads);
>   	kvfree(pool);
>   }
> @@ -64,7 +49,6 @@ struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs,
>   {
>   	struct xsk_buff_pool *pool;
>   	struct xdp_buff_xsk *xskb;
> -	int err;
>   	u32 i;
>   
>   	pool = kvzalloc(struct_size(pool, free_heads, umem->chunks),
> @@ -86,6 +70,7 @@ struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs,
>   	pool->frame_len = umem->chunk_size - umem->headroom -
>   		XDP_PACKET_HEADROOM;
>   	pool->umem = umem;
> +	pool->addrs = umem->addrs;
>   	INIT_LIST_HEAD(&pool->free_list);
>   	INIT_LIST_HEAD(&pool->xsk_tx_list);
>   	spin_lock_init(&pool->xsk_tx_list_lock);
> @@ -103,9 +88,7 @@ struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs,
>   		pool->free_heads[i] = xskb;
>   	}
>   
> -	err = xp_addr_map(pool, umem->pgs, umem->npgs);
> -	if (!err)
> -		return pool;
> +	return pool;
>   
>   out:
>   	xp_destroy(pool);
>