netdev - Re: [PATCH net-next 09/10] bnx2x: Added FW GRO bridging support

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Date:	Mon, 14 Jan 2013 09:22:03 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yuval Mintz <yuvalmin@...adcom.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, eilong@...adcom.com,
	ariele@...adcom.com
Subject: Re: [PATCH net-next 09/10] bnx2x: Added FW GRO bridging support

On Mon, 2013-01-14 at 17:11 +0200, Yuval Mintz wrote:
> Since submit 621b4d6 the bnx2x driver support FW GRO.
> However, when using the device with GRO enabled in bridging
> scenarios throughput is very low, as the bridge expects all
> incoming packets to be passed with CHECKSUM_PARTIAL -
> a demand which is satisfied by the SW GRO implementation,
> but was missed in the bnx2x driver implementation (which returned
> CHECKSUM_UNNECESSARY).
> 
> Now, given that the traffic is supported by FW GRO (TCP/IP),
> the bnx2x driver calculates the pseudo checksum by itself,
> passing skbs with CHECKSUM_PARTIAL and giving a much better
> throughput when receiving GRO traffic.
> 
> Signed-off-by: Yuval Mintz <yuvalmin@...adcom.com>
> Signed-off-by: Ariel Elior <ariele@...adcom.com>
> Signed-off-by: Eilon Greenstein <eilong@...adcom.com>
> ---
>  drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 54 ++++++++++++++++++++++++-
>  1 file changed, 52 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
> index a6f4140..963eb2d 100644
> --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
> +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
> @@ -21,6 +21,7 @@
>  #include <linux/if_vlan.h>
>  #include <linux/interrupt.h>
>  #include <linux/ip.h>
> +#include <net/tcp.h>
>  #include <net/ipv6.h>
>  #include <net/ip6_checksum.h>
>  #include <linux/prefetch.h>
> @@ -506,7 +507,7 @@ static int bnx2x_fill_frag_skb(struct bnx2x *bp, struct bnx2x_fastpath *fp,
>  					tpa_info->parsing_flags, len_on_bd);
>  
>  		/* set for GRO */
> -		if (fp->mode == TPA_MODE_GRO)
> +		if (fp->mode == TPA_MODE_GRO && skb_shinfo(skb)->gso_size)
>  			skb_shinfo(skb)->gso_type =
>  			    (GET_FLAG(tpa_info->parsing_flags,
>  				      PARSING_FLAGS_OVER_ETHERNET_PROTOCOL) ==
> @@ -595,6 +596,55 @@ static void *bnx2x_frag_alloc(const struct bnx2x_fastpath *fp)
>  }
>  
> 
> +#ifdef CONFIG_INET
> +static void bnx2x_gro_ip_csum(struct bnx2x *bp, struct sk_buff *skb)
> +{
> +	const struct iphdr *iph = ip_hdr(skb);
> +	struct tcphdr *th;
> +
> +	skb_set_transport_header(skb, sizeof(struct iphdr));
> +	th = tcp_hdr(skb);
> +
> +	th->check = ~tcp_v4_check(skb->len - skb_transport_offset(skb),
> +				  iph->saddr, iph->daddr, 0);
> +}
> +
> +static void bnx2x_gro_ipv6_csum(struct bnx2x *bp, struct sk_buff *skb)
> +{
> +	struct ipv6hdr *iph = ipv6_hdr(skb);
> +	struct tcphdr *th;
> +
> +	skb_set_transport_header(skb, sizeof(struct ipv6hdr));
> +	th = tcp_hdr(skb);
> +
> +	th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb),
> +				  &iph->saddr, &iph->daddr, 0);
> +}
> +#endif
> +
> +static void bnx2x_gro_receive(struct bnx2x *bp, struct bnx2x_fastpath *fp,
> +			       struct sk_buff *skb)
> +{
> +#ifdef CONFIG_INET
> +	if (fp->mode == TPA_MODE_GRO && skb_shinfo(skb)->gso_size) {
> +		skb_set_network_header(skb, 0);
> +		switch (be16_to_cpu(skb->protocol)) {
> +		case ETH_P_IP:
> +			bnx2x_gro_ip_csum(bp, skb);
> +			break;
> +		case ETH_P_IPV6:
> +			bnx2x_gro_ipv6_csum(bp, skb);
> +			break;
> +		default:
> +			BNX2X_ERR("FW GRO supports only IPv4/IPv6, not 0x%04x\n",
> +				  be16_to_cpu(skb->protocol));
> +		}
> +		tcp_gro_complete(skb);

This looks weird to me. This should be called by GRO stack only.

What is the value of gso_segs ?



> +	}
> +#endif
> +	napi_gro_receive(&fp->napi, skb);
> +}
> +
>  static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,
>  			   struct bnx2x_agg_info *tpa_info,
>  			   u16 pages,
> @@ -648,7 +698,7 @@ static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,
>  					 skb, cqe, cqe_idx)) {
>  			if (tpa_info->parsing_flags & PARSING_FLAGS_VLAN)
>  				__vlan_hwaccel_put_tag(skb, tpa_info->vlan_tag);
> -			napi_gro_receive(&fp->napi, skb);
> +			bnx2x_gro_receive(bp, fp, skb);
>  		} else {
>  			DP(NETIF_MSG_RX_STATUS,
>  			   "Failed to allocate new pages - dropping packet!\n");


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