netdev - Re: [PATCH 06/14] bna: TX Path and RX Path Changes

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Date:	Tue, 16 Aug 2011 22:45:55 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Rasesh Mody <rmody@...cade.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	adapter_linux_open_src_team@...cade.com,
	Gurunatha Karaje <gkaraje@...cade.com>
Subject: Re: [PATCH 06/14] bna: TX Path and RX Path Changes

On Tue, 2011-08-16 at 14:19 -0700, Rasesh Mody wrote:
> Change details:
>  - Disable and enable interrupts from the same polling context to prevent
>    reordering in Rx path.
>  - Add Rx NAPI debug counters.
>  - Make NAPI budget check more generic
>  - Add a macro bnad_dim_timer_stop for DIM(Dynamic Interrupt Moderation)
>    timer stop
>  - Handle reduced MSI-X vectors case in bnad_enable_msix
>  - Replace existing checks with macros and add more checks for illegal skbs
>    in transmit path. Add more tx_skb counters for dropped skbs.
>  - Check for single frame TSO skbs and send them out as non-TSO.
>  - Put memory barrier after bna_txq_prod_indx_doorbell()
> 
> Signed-off-by: Gurunatha Karaje <gkaraje@...cade.com>
> Signed-off-by: Rasesh Mody <rmody@...cade.com>
> ---
>  drivers/net/ethernet/brocade/bna/bnad.c |  207 +++++++++++++++++--------------
>  drivers/net/ethernet/brocade/bna/bnad.h |   33 +++++-
>  2 files changed, 148 insertions(+), 92 deletions(-)
> 
> diff --git a/drivers/net/ethernet/brocade/bna/bnad.c b/drivers/net/ethernet/brocade/bna/bnad.c
> index 64e2106..0faa8a1 100644
> --- a/drivers/net/ethernet/brocade/bna/bnad.c
> +++ b/drivers/net/ethernet/brocade/bna/bnad.c
> @@ -532,7 +532,7 @@ bnad_poll_cq(struct bnad *bnad, struct bna_ccb *ccb, int budget)
>  		      (flags & BNA_CQ_EF_L4_CKSUM_OK)))
>  			skb->ip_summed = CHECKSUM_UNNECESSARY;
>  		else
> -			skb_checksum_none_assert(skb);
> +			skb->ip_summed = CHECKSUM_NONE;
>  
>  		rcb->rxq->rx_packets++;
>  		rcb->rxq->rx_bytes += skb->len;
[...]

This is reverting part of:

commit bc8acf2c8c3e43fcc192762a9f964b3e9a17748b
Author: Eric Dumazet <eric.dumazet@...il.com>
Date:   Thu Sep 2 13:07:41 2010 -0700

    drivers/net: avoid some skb->ip_summed initializations

and I don't see any justification for that.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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