netdev - Re: [net-next 06/14] net/mlx5e: XDP, Inline small packets into the TX MPWQE in XDP xmit flow

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Date:   Tue, 23 Apr 2019 15:53:09 +0300
From:   Gal Pressman <galpress@...zon.com>
To:     Saeed Mahameed <saeedm@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Jonathan Lemon <bsd@...com>,
        Shay Agroskin <shayag@...lanox.com>,
        "Tariq Toukan" <tariqt@...lanox.com>
Subject: Re: [net-next 06/14] net/mlx5e: XDP, Inline small packets into the TX
 MPWQE in XDP xmit flow

On 23-Apr-19 01:32, Saeed Mahameed wrote:
>  static inline void
> -mlx5e_xdp_mpwqe_add_dseg(struct mlx5e_xdpsq *sq, dma_addr_t dma_addr, u16 dma_len)
> +mlx5e_xdp_mpwqe_add_dseg(struct mlx5e_xdpsq *sq, struct mlx5e_xdp_info *xdpi,
> +			 struct mlx5e_xdpsq_stats *stats)

Passing stats as a function parameter is weird, why not remove and use sq->stats?

>  {
>  	struct mlx5e_xdp_mpwqe *session = &sq->mpwqe;
> +	dma_addr_t dma_addr    = xdpi->dma_addr;
> +	struct xdp_frame *xdpf = xdpi->xdpf;
>  	struct mlx5_wqe_data_seg *dseg =
> -		(struct mlx5_wqe_data_seg *)session->wqe + session->ds_count++;
> +		(struct mlx5_wqe_data_seg *)session->wqe + session->ds_count;
> +	u16 dma_len = xdpf->len;
>  
> +	session->pkt_count++;
> +
> +#define MLX5E_XDP_INLINE_WQE_SZ_THRSD (256 - sizeof(struct mlx5_wqe_inline_seg))
> +
> +	if (session->inline_on && dma_len <= MLX5E_XDP_INLINE_WQE_SZ_THRSD) {
> +		struct mlx5_wqe_inline_seg *inline_dseg =
> +			(struct mlx5_wqe_inline_seg *)dseg;
> +		u16 ds_len = sizeof(*inline_dseg) + dma_len;
> +		u16 ds_cnt = DIV_ROUND_UP(ds_len, MLX5_SEND_WQE_DS);
> +
> +		if (unlikely(session->ds_count + ds_cnt > session->max_ds_count)) {
> +			/* Not enough space for inline wqe, send with memory pointer */
> +			session->complete = true;
> +			goto no_inline;
> +		}
> +
> +		inline_dseg->byte_count = cpu_to_be32(dma_len | MLX5_INLINE_SEG);
> +		memcpy(inline_dseg->data, xdpf->data, dma_len);
> +
> +		session->ds_count += ds_cnt;
> +		stats->inlnw++;
> +		return;
> +	}
> +
> +no_inline:
>  	dseg->addr       = cpu_to_be64(dma_addr);
>  	dseg->byte_count = cpu_to_be32(dma_len);
>  	dseg->lkey       = sq->mkey_be;
> +	session->ds_count++;
>  }