linux-kernel - [RESEND NET-NEXT PATCH 11/20] igb: reenable CRC stripping in hardware

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Message-ID: <20080708220800.1518.10572.stgit@localhost.localdomain>
Date:	Tue, 08 Jul 2008 15:08:29 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	jeff@...zik.org, davem@...emloft.net
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, Auke Kok <auke-jan.h.kok@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [RESEND NET-NEXT PATCH 11/20] igb: reenable CRC stripping in hardware

From: Auke Kok <auke-jan.h.kok@...el.com>

We can remove a clunky workaround for not having the hardware
strip the CRC. 82575 silicon as well as the older PCI Express
e1000e hardware all work OK in this respect.

Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---

 drivers/net/igb/igb_main.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index e8ef541..ae329c0 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -1664,10 +1664,12 @@ static void igb_setup_rctl(struct igb_adapter *adapter)
 		E1000_RCTL_LBM_NO | E1000_RCTL_RDMTS_HALF |
 		(adapter->hw.mac.mc_filter_type << E1000_RCTL_MO_SHIFT);
 
-	/* disable the stripping of CRC because it breaks
-	 * BMC firmware connected over SMBUS
-	rctl |= E1000_RCTL_SECRC;
+	/*
+	 * enable stripping of CRC. It's unlikely this will break BMC
+	 * redirection as it did with e1000. Newer features require
+	 * that the HW strips the CRC.
 	*/
+	rctl |= E1000_RCTL_SECRC;
 
 	rctl &= ~E1000_RCTL_SBP;
 
@@ -3743,7 +3745,6 @@ static bool igb_clean_rx_irq_adv(struct igb_ring *rx_ring,
 			}
 		}
 send_up:
-		pskb_trim(skb, skb->len - 4);
 		i++;
 		if (i == rx_ring->count)
 			i = 0;

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