netdev - Re: [PATCH v3 net-next 14/14] mlx5: support BIG TCP packets

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Message-ID: <20220309204405.58079350@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Wed, 9 Mar 2022 20:44:05 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Alexander Duyck <alexanderduyck@...com>,
        Coco Li <lixiaoyan@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>
Subject: Re: [PATCH v3 net-next 14/14] mlx5: support BIG TCP packets

On Wed,  9 Mar 2022 16:28:46 -0800 Eric Dumazet wrote:
> @@ -918,12 +953,27 @@ void mlx5i_sq_xmit(struct mlx5e_txqsq *sq, struct sk_buff *skb,
>  	eseg->mss = attr.mss;
>  
>  	if (attr.ihs) {
> -		memcpy(eseg->inline_hdr.start, skb->data, attr.ihs);
> +		if (unlikely(attr.hopbyhop)) {
> +			/* remove the HBH header.
> +			 * Layout: [Ethernet header][IPv6 header][HBH][TCP header]
> +			 */
> +			memcpy(eseg->inline_hdr.start, skb->data, ETH_HLEN + sizeof(*h6));
> +			h6 = (struct ipv6hdr *)((char *)eseg->inline_hdr.start + ETH_HLEN);
> +			h6->nexthdr = IPPROTO_TCP;
> +			/* Copy the TCP header after the IPv6 one */
> +			memcpy(h6 + 1,
> +			       skb->data + ETH_HLEN + sizeof(*h6) +
> +					sizeof(struct hop_jumbo_hdr),
> +			       tcp_hdrlen(skb));
> +			/* Leave ipv6 payload_len set to 0, as LSO v2 specs request. */
> +		} else {
> +			memcpy(eseg->inline_hdr.start, skb->data, attr.ihs);
> +		}

Compiler says there's no h6 in mlx5i_sq_xmit().