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From: Tariq Toukan <ttoukan.linux@gmail.com>
To: "Toke Høiland-Jørgensen" <toke@redhat.com>,
	"Stanislav Fomichev" <sdf@google.com>,
	"Tariq Toukan" <ttoukan.linux@gmail.com>
Cc: bpf@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net,
	andrii@kernel.org, martin.lau@linux.dev, song@kernel.org,
	yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org,
	haoluo@google.com, jolsa@kernel.org,
	Saeed Mahameed <saeedm@nvidia.com>,
	David Ahern <dsahern@gmail.com>, Jakub Kicinski <kuba@kernel.org>,
	Willem de Bruijn <willemb@google.com>,
	Jesper Dangaard Brouer <brouer@redhat.com>,
	Anatoly Burakov <anatoly.burakov@intel.com>,
	Alexander Lobakin <alexandr.lobakin@intel.com>,
	Magnus Karlsson <magnus.karlsson@gmail.com>,
	Maryam Tahhan <mtahhan@redhat.com>,
	xdp-hints@xdp-project.net, netdev@vger.kernel.org
Subject: [xdp-hints] Re: [PATCH bpf-next v7 15/17] net/mlx5e: Introduce wrapper for xdp_buff
Date: Fri, 13 Jan 2023 22:53:47 +0200	[thread overview]
Message-ID: <d83f2193-3fb9-e30f-cfb0-f1098f039b67@gmail.com> (raw)
In-Reply-To: <87h6wvfmfa.fsf@toke.dk>



On 12/01/2023 23:55, Toke Høiland-Jørgensen wrote:
> Toke Høiland-Jørgensen <toke@redhat.com> writes:
> 
>> Stanislav Fomichev <sdf@google.com> writes:
>>
>>> On Thu, Jan 12, 2023 at 12:07 AM Tariq Toukan <ttoukan.linux@gmail.com> wrote:
>>>>
>>>>
>>>>
>>>> On 12/01/2023 2:32, Stanislav Fomichev wrote:
>>>>> From: Toke Høiland-Jørgensen <toke@redhat.com>
>>>>>
>>>>> Preparation for implementing HW metadata kfuncs. No functional change.
>>>>>
>>>>> Cc: Tariq Toukan <tariqt@nvidia.com>
>>>>> Cc: Saeed Mahameed <saeedm@nvidia.com>
>>>>> Cc: John Fastabend <john.fastabend@gmail.com>
>>>>> Cc: David Ahern <dsahern@gmail.com>
>>>>> Cc: Martin KaFai Lau <martin.lau@linux.dev>
>>>>> Cc: Jakub Kicinski <kuba@kernel.org>
>>>>> Cc: Willem de Bruijn <willemb@google.com>
>>>>> Cc: Jesper Dangaard Brouer <brouer@redhat.com>
>>>>> Cc: Anatoly Burakov <anatoly.burakov@intel.com>
>>>>> Cc: Alexander Lobakin <alexandr.lobakin@intel.com>
>>>>> Cc: Magnus Karlsson <magnus.karlsson@gmail.com>
>>>>> Cc: Maryam Tahhan <mtahhan@redhat.com>
>>>>> Cc: xdp-hints@xdp-project.net
>>>>> Cc: netdev@vger.kernel.org
>>>>> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
>>>>> Signed-off-by: Stanislav Fomichev <sdf@google.com>
>>>>> ---
>>>>>    drivers/net/ethernet/mellanox/mlx5/core/en.h  |  1 +
>>>>>    .../net/ethernet/mellanox/mlx5/core/en/xdp.c  |  3 +-
>>>>>    .../net/ethernet/mellanox/mlx5/core/en/xdp.h  |  6 +-
>>>>>    .../ethernet/mellanox/mlx5/core/en/xsk/rx.c   | 25 ++++----
>>>>>    .../net/ethernet/mellanox/mlx5/core/en_rx.c   | 58 +++++++++----------
>>>>>    5 files changed, 50 insertions(+), 43 deletions(-)
>>>>>
>>>>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
>>>>> index 2d77fb8a8a01..af663978d1b4 100644
>>>>> --- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
>>>>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
>>>>> @@ -469,6 +469,7 @@ struct mlx5e_txqsq {
>>>>>    union mlx5e_alloc_unit {
>>>>>        struct page *page;
>>>>>        struct xdp_buff *xsk;
>>>>> +     struct mlx5e_xdp_buff *mxbuf;
>>>>
>>>> In XSK files below you mix usage of both alloc_units[page_idx].mxbuf and
>>>> alloc_units[page_idx].xsk, while both fields share the memory of a union.
>>>>
>>>> As struct mlx5e_xdp_buff wraps struct xdp_buff, I think that you just
>>>> need to change the existing xsk field type from struct xdp_buff *xsk
>>>> into struct mlx5e_xdp_buff *xsk and align the usage.
>>>
>>> Hmmm, good point. I'm actually not sure how it works currently.
>>> mlx5e_alloc_unit.mxbuf doesn't seem to be initialized anywhere? Toke,
>>> am I missing something?
>>
>> It's initialised piecemeal in different places; but yeah, we're mixing
>> things a bit...
>>
>>> I'm thinking about something like this:
>>>
>>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h
>>> b/drivers/net/ethernet/mellanox/mlx5/core/en.h
>>> index af663978d1b4..2d77fb8a8a01 100644
>>> --- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
>>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
>>> @@ -469,7 +469,6 @@ struct mlx5e_txqsq {
>>>   union mlx5e_alloc_unit {
>>>          struct page *page;
>>>          struct xdp_buff *xsk;
>>> -       struct mlx5e_xdp_buff *mxbuf;
>>>   };
>>
>> Hmm, for consistency with the non-XSK path we should rather go the other
>> direction and lose the xsk member, moving everything to mxbuf? Let me
>> give that a shot...
> 
> Something like the below?
> 
> -Toke
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
> index 6de02d8aeab8..cb9cdb6421c5 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
> @@ -468,7 +468,6 @@ struct mlx5e_txqsq {
>   
>   union mlx5e_alloc_unit {
>   	struct page *page;
> -	struct xdp_buff *xsk;
>   	struct mlx5e_xdp_buff *mxbuf;
>   };
>   
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
> index cb568c62aba0..95694a25ec31 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
> @@ -33,6 +33,7 @@
>   #define __MLX5_EN_XDP_H__
>   
>   #include <linux/indirect_call_wrapper.h>
> +#include <net/xdp_sock_drv.h>
>   
>   #include "en.h"
>   #include "en/txrx.h"
> @@ -112,6 +113,21 @@ static inline void mlx5e_xmit_xdp_doorbell(struct mlx5e_xdpsq *sq)
>   	}
>   }
>   
> +static inline struct mlx5e_xdp_buff *mlx5e_xsk_buff_alloc(struct xsk_buff_pool *pool)
> +{
> +	return (struct mlx5e_xdp_buff *)xsk_buff_alloc(pool);

What about the space needed for the rq / cqe fields? xsk_buff_alloc 
won't allocate it.

> +}
> +
> +static inline void mlx5e_xsk_buff_free(struct mlx5e_xdp_buff *mxbuf)
> +{
> +	xsk_buff_free(&mxbuf->xdp);
> +}
> +
> +static inline dma_addr_t mlx5e_xsk_buff_xdp_get_frame_dma(struct mlx5e_xdp_buff *mxbuf)
> +{
> +	return xsk_buff_xdp_get_frame_dma(&mxbuf->xdp);
> +}
> +
>   /* Enable inline WQEs to shift some load from a congested HCA (HW) to
>    * a less congested cpu (SW).
>    */
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c
> index 8bf3029abd3c..1f166dbb7f22 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c
> @@ -3,7 +3,6 @@
>   
>   #include "rx.h"
>   #include "en/xdp.h"
> -#include <net/xdp_sock_drv.h>
>   #include <linux/filter.h>
>   
>   /* RX data path */
> @@ -21,7 +20,7 @@ int mlx5e_xsk_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
>   	if (unlikely(!xsk_buff_can_alloc(rq->xsk_pool, rq->mpwqe.pages_per_wqe)))
>   		goto err;
>   
> -	BUILD_BUG_ON(sizeof(wi->alloc_units[0]) != sizeof(wi->alloc_units[0].xsk));
> +	BUILD_BUG_ON(sizeof(wi->alloc_units[0]) != sizeof(wi->alloc_units[0].mxbuf));
>   	XSK_CHECK_PRIV_TYPE(struct mlx5e_xdp_buff);
>   	batch = xsk_buff_alloc_batch(rq->xsk_pool, (struct xdp_buff **)wi->alloc_units,
>   				     rq->mpwqe.pages_per_wqe);

This batching API gets broken as well...
xsk_buff_alloc_batch fills an array of struct xdp_buff pointers, it 
cannot correctly act on the array of struct mlx5e_xdp_buff, as it 
contains additional fields.

Maybe letting mlx5e_xdp_buff point to its struct xdp_buff (instead of 
wrapping it) will solve the problems here, then we'll loop over the 
xdp_buff * array and copy the pointers into the struct mlx5e_xdp_buff * 
array.
Need to give it deeper thoughts...

struct mlx5e_xdp_buff {
	struct xdp_buff *xdp;
	struct mlx5_cqe64 *cqe;
	struct mlx5e_rq *rq;
};


> @@ -33,8 +32,8 @@ int mlx5e_xsk_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
>   	 * the first error, which will mean there are no more valid descriptors.
>   	 */
>   	for (; batch < rq->mpwqe.pages_per_wqe; batch++) {
> -		wi->alloc_units[batch].xsk = xsk_buff_alloc(rq->xsk_pool);
> -		if (unlikely(!wi->alloc_units[batch].xsk))
> +		wi->alloc_units[batch].mxbuf = mlx5e_xsk_buff_alloc(rq->xsk_pool);
> +		if (unlikely(!wi->alloc_units[batch].mxbuf))
>   			goto err_reuse_batch;
>   	}
>   
> @@ -44,7 +43,7 @@ int mlx5e_xsk_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
>   
>   	if (likely(rq->mpwqe.umr_mode == MLX5E_MPWRQ_UMR_MODE_ALIGNED)) {
>   		for (i = 0; i < batch; i++) {
> -			dma_addr_t addr = xsk_buff_xdp_get_frame_dma(wi->alloc_units[i].xsk);
> +			dma_addr_t addr = mlx5e_xsk_buff_xdp_get_frame_dma(wi->alloc_units[i].mxbuf);
>   
>   			umr_wqe->inline_mtts[i] = (struct mlx5_mtt) {
>   				.ptag = cpu_to_be64(addr | MLX5_EN_WR),
> @@ -53,7 +52,7 @@ int mlx5e_xsk_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
>   		}
>   	} else if (unlikely(rq->mpwqe.umr_mode == MLX5E_MPWRQ_UMR_MODE_UNALIGNED)) {
>   		for (i = 0; i < batch; i++) {
> -			dma_addr_t addr = xsk_buff_xdp_get_frame_dma(wi->alloc_units[i].xsk);
> +			dma_addr_t addr = mlx5e_xsk_buff_xdp_get_frame_dma(wi->alloc_units[i].mxbuf);
>   
>   			umr_wqe->inline_ksms[i] = (struct mlx5_ksm) {
>   				.key = rq->mkey_be,
> @@ -65,7 +64,7 @@ int mlx5e_xsk_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
>   		u32 mapping_size = 1 << (rq->mpwqe.page_shift - 2);
>   
>   		for (i = 0; i < batch; i++) {
> -			dma_addr_t addr = xsk_buff_xdp_get_frame_dma(wi->alloc_units[i].xsk);
> +			dma_addr_t addr = mlx5e_xsk_buff_xdp_get_frame_dma(wi->alloc_units[i].mxbuf);
>   
>   			umr_wqe->inline_ksms[i << 2] = (struct mlx5_ksm) {
>   				.key = rq->mkey_be,
> @@ -91,7 +90,7 @@ int mlx5e_xsk_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
>   		__be32 frame_size = cpu_to_be32(rq->xsk_pool->chunk_size);
>   
>   		for (i = 0; i < batch; i++) {
> -			dma_addr_t addr = xsk_buff_xdp_get_frame_dma(wi->alloc_units[i].xsk);
> +			dma_addr_t addr = mlx5e_xsk_buff_xdp_get_frame_dma(wi->alloc_units[i].mxbuf);
>   
>   			umr_wqe->inline_klms[i << 1] = (struct mlx5_klm) {
>   				.key = rq->mkey_be,
> @@ -137,7 +136,7 @@ int mlx5e_xsk_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
>   
>   err_reuse_batch:
>   	while (--batch >= 0)
> -		xsk_buff_free(wi->alloc_units[batch].xsk);
> +		mlx5e_xsk_buff_free(wi->alloc_units[batch].mxbuf);
>   
>   err:
>   	rq->stats->buff_alloc_err++;
> @@ -156,7 +155,7 @@ int mlx5e_xsk_alloc_rx_wqes_batched(struct mlx5e_rq *rq, u16 ix, int wqe_bulk)
>   	 * allocate XDP buffers straight into alloc_units.
>   	 */
>   	BUILD_BUG_ON(sizeof(rq->wqe.alloc_units[0]) !=
> -		     sizeof(rq->wqe.alloc_units[0].xsk));
> +		     sizeof(rq->wqe.alloc_units[0].mxbuf));
>   	buffs = (struct xdp_buff **)rq->wqe.alloc_units;
>   	contig = mlx5_wq_cyc_get_size(wq) - ix;
>   	if (wqe_bulk <= contig) {
> @@ -177,8 +176,9 @@ int mlx5e_xsk_alloc_rx_wqes_batched(struct mlx5e_rq *rq, u16 ix, int wqe_bulk)
>   		/* Assumes log_num_frags == 0. */
>   		frag = &rq->wqe.frags[j];
>   
> -		addr = xsk_buff_xdp_get_frame_dma(frag->au->xsk);
> +		addr = mlx5e_xsk_buff_xdp_get_frame_dma(frag->au->mxbuf);
>   		wqe->data[0].addr = cpu_to_be64(addr + rq->buff.headroom);
> +		frag->au->mxbuf->rq = rq;
>   	}
>   
>   	return alloc;
> @@ -199,12 +199,13 @@ int mlx5e_xsk_alloc_rx_wqes(struct mlx5e_rq *rq, u16 ix, int wqe_bulk)
>   		/* Assumes log_num_frags == 0. */
>   		frag = &rq->wqe.frags[j];
>   
> -		frag->au->xsk = xsk_buff_alloc(rq->xsk_pool);
> -		if (unlikely(!frag->au->xsk))
> +		frag->au->mxbuf = mlx5e_xsk_buff_alloc(rq->xsk_pool);
> +		if (unlikely(!frag->au->mxbuf))
>   			return i;
>   
> -		addr = xsk_buff_xdp_get_frame_dma(frag->au->xsk);
> +		addr = mlx5e_xsk_buff_xdp_get_frame_dma(frag->au->mxbuf);
>   		wqe->data[0].addr = cpu_to_be64(addr + rq->buff.headroom);
> +		frag->au->mxbuf->rq = rq;
>   	}
>   
>   	return wqe_bulk;
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
> index 7b08653be000..4313165709cb 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
> @@ -41,7 +41,6 @@
>   #include <net/gro.h>
>   #include <net/udp.h>
>   #include <net/tcp.h>
> -#include <net/xdp_sock_drv.h>
>   #include "en.h"
>   #include "en/txrx.h"
>   #include "en_tc.h"
> @@ -434,7 +433,7 @@ static inline void mlx5e_free_rx_wqe(struct mlx5e_rq *rq,
>   		 * put into the Reuse Ring, because there is no way to return
>   		 * the page to the userspace when the interface goes down.
>   		 */
> -		xsk_buff_free(wi->au->xsk);
> +		mlx5e_xsk_buff_free(wi->au->mxbuf);
>   		return;
>   	}
>   
> @@ -515,7 +514,7 @@ mlx5e_free_rx_mpwqe(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi, bool recycle
>   		 */
>   		for (i = 0; i < rq->mpwqe.pages_per_wqe; i++)
>   			if (no_xdp_xmit || !test_bit(i, wi->xdp_xmit_bitmap))
> -				xsk_buff_free(alloc_units[i].xsk);
> +				mlx5e_xsk_buff_free(alloc_units[i].mxbuf);
>   	} else {
>   		for (i = 0; i < rq->mpwqe.pages_per_wqe; i++)
>   			if (no_xdp_xmit || !test_bit(i, wi->xdp_xmit_bitmap))
> 

  parent reply	other threads:[~2023-01-13 20:53 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-12  0:32 [xdp-hints] [PATCH bpf-next v7 00/17] xdp: hints via kfuncs Stanislav Fomichev
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 01/17] bpf: Document XDP RX metadata Stanislav Fomichev
2023-01-16 13:09   ` [xdp-hints] " Jesper Dangaard Brouer
2023-01-17 20:33     ` Stanislav Fomichev
2023-01-18 14:28       ` Jesper Dangaard Brouer
2023-01-18 17:55         ` Stanislav Fomichev
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 02/17] bpf: Rename bpf_{prog,map}_is_dev_bound to is_offloaded Stanislav Fomichev
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 03/17] bpf: Move offload initialization into late_initcall Stanislav Fomichev
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 04/17] bpf: Reshuffle some parts of bpf/offload.c Stanislav Fomichev
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 05/17] bpf: Introduce device-bound XDP programs Stanislav Fomichev
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 06/17] selftests/bpf: Update expected test_offload.py messages Stanislav Fomichev
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 07/17] bpf: XDP metadata RX kfuncs Stanislav Fomichev
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 09/17] veth: Introduce veth_xdp_buff wrapper for xdp_buff Stanislav Fomichev
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 10/17] veth: Support RX XDP metadata Stanislav Fomichev
2023-01-16 16:21   ` [xdp-hints] " Jesper Dangaard Brouer
2023-01-17 20:33     ` Stanislav Fomichev
2023-01-18 15:57       ` Jesper Dangaard Brouer
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 11/17] selftests/bpf: Verify xdp_metadata xdp->af_xdp path Stanislav Fomichev
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 12/17] net/mlx4_en: Introduce wrapper for xdp_buff Stanislav Fomichev
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 13/17] net/mlx4_en: Support RX XDP metadata Stanislav Fomichev
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 14/17] xsk: Add cb area to struct xdp_buff_xsk Stanislav Fomichev
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 15/17] net/mlx5e: Introduce wrapper for xdp_buff Stanislav Fomichev
2023-01-12  8:07   ` [xdp-hints] " Tariq Toukan
2023-01-12 19:10     ` Stanislav Fomichev
2023-01-12 21:09       ` Toke Høiland-Jørgensen
2023-01-12 21:55         ` Toke Høiland-Jørgensen
2023-01-12 22:18           ` Stanislav Fomichev
2023-01-12 22:29             ` Toke Høiland-Jørgensen
2023-01-13 20:55               ` Tariq Toukan
2023-01-13 20:53           ` Tariq Toukan [this message]
2023-01-13 21:31             ` Toke Høiland-Jørgensen
2023-01-15  6:59               ` Tariq Toukan
2023-01-15 11:13                 ` Toke Høiland-Jørgensen
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 16/17] net/mlx5e: Support RX XDP metadata Stanislav Fomichev
2023-01-12  8:13   ` [xdp-hints] " Tariq Toukan
2023-01-12 19:09     ` Stanislav Fomichev
2023-01-13 20:25       ` Tariq Toukan
2023-01-12  0:32 ` [xdp-hints] [PATCH bpf-next v7 17/17] selftests/bpf: Simple program to dump XDP RX metadata Stanislav Fomichev
2023-01-12  7:29 ` [xdp-hints] Re: [PATCH bpf-next v7 00/17] xdp: hints via kfuncs Martin KaFai Lau
2023-01-12  8:19   ` Tariq Toukan
2023-01-12 18:09     ` Stanislav Fomichev
2023-01-12 18:20       ` Martin KaFai Lau

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