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Date: Wed, 24 Aug 2011 14:16:32 +0300
From: "Vlad Zolotarov" <vladz@...adcom.com>
To: "Michal Schmidt" <mschmidt@...hat.com>
cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"Eilon Greenstein" <eilong@...adcom.com>,
"Dmitry Kravkov" <dmitry@...adcom.com>
Subject: Re: [PATCH 2/2] bnx2x: expose HW RX VLAN stripping toggle
On Tuesday 23 August 2011 19:15:39 Michal Schmidt wrote:
> Allow disabling of HW RX VLAN stripping with ethtool.
>
> Signed-off-by: Michal Schmidt <mschmidt@...hat.com>
> CC: Vladislav Zolotarov <vladz@...adcom.com>
> CC: Eilon Greenstein <eilong@...adcom.com>
> CC: Dmitry Kravkov <dmitry@...adcom.com>
> ---
>
> drivers/net/ethernet/broadcom/bnx2x/bnx2x.h | 1 +
> drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 18 ++++++++++++++----
> drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c | 10 +++++-----
> 3 files changed, 20 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
> b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h index f127768..dd43634
> 100644
> --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
> +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
> @@ -1178,6 +1178,7 @@ struct bnx2x {
> #define NO_MCP_FLAG (1 << 9)
>
> #define BP_NOMCP(bp) (bp->flags & NO_MCP_FLAG)
> +#define RX_VLAN_STRIP_FLAG (1 << 10)
> #define MF_FUNC_DIS (1 << 11)
> #define OWN_CNIC_IRQ (1 << 12)
> #define NO_ISCSI_OOO_FLAG (1 << 13)
> diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
> b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c index 93bff08..340bff9
> 100644
> --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
> +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
> @@ -385,6 +385,10 @@ static inline u16 bnx2x_set_lro_mss(struct bnx2x *bp,
> u16 parsing_flags, else /* IPv4 */
> hdrs_len += sizeof(struct iphdr);
>
> + /* VLAN header present and not stripped by HW */
> + if ((parsing_flags & PARSING_FLAGS_VLAN) &&
> + !(bp->flags & RX_VLAN_STRIP_FLAG))
> + hdrs_len += VLAN_HLEN;
>
> /* Check if there was a TCP timestamp, if there is it's will
> * always be 12 bytes length: nop nop kind length echo val.
> @@ -412,7 +416,7 @@ static int bnx2x_fill_frag_skb(struct bnx2x *bp, struct
> bnx2x_fastpath *fp, frag_size = le16_to_cpu(cqe->pkt_len) - len_on_bd;
> pages = SGE_PAGE_ALIGN(frag_size) >> SGE_PAGE_SHIFT;
>
> - /* This is needed in order to enable forwarding support */
> + /* Doing LRO, let TCP know the receive MSS */
> if (frag_size)
> skb_shinfo(skb)->gso_size = bnx2x_set_lro_mss(bp,
> tpa_info->parsing_flags, len_on_bd);
> @@ -514,7 +518,8 @@ static void bnx2x_tpa_stop(struct bnx2x *bp, struct
> bnx2x_fastpath *fp, skb->ip_summed = CHECKSUM_UNNECESSARY;
>
> if (!bnx2x_fill_frag_skb(bp, fp, queue, skb, cqe, cqe_idx)) {
> - if (tpa_info->parsing_flags & PARSING_FLAGS_VLAN)
> + if ((tpa_info->parsing_flags & PARSING_FLAGS_VLAN) &&
> + (bp->flags & RX_VLAN_STRIP_FLAG))
> __vlan_hwaccel_put_tag(skb, tpa_info-
>vlan_tag);
> napi_gro_receive(&fp->napi, skb);
> } else {
> @@ -757,8 +762,8 @@ reuse_rx:
>
> skb_record_rx_queue(skb, fp->index);
>
> - if (le16_to_cpu(cqe_fp->pars_flags.flags) &
> - PARSING_FLAGS_VLAN)
> + if ((le16_to_cpu(cqe_fp->pars_flags.flags) &
> + PARSING_FLAGS_VLAN) && (bp->flags & RX_VLAN_STRIP_FLAG))
> __vlan_hwaccel_put_tag(skb,
> le16_to_cpu(cqe_fp->vlan_tag));
> napi_gro_receive(&fp->napi, skb);
> @@ -3431,6 +3436,11 @@ int bnx2x_set_features(struct net_device *dev, u32
> features) else
> flags &= ~TPA_ENABLE_FLAG;
>
> + if (features & NETIF_F_HW_VLAN_RX)
> + flags |= RX_VLAN_STRIP_FLAG;
> + else
> + flags &= ~RX_VLAN_STRIP_FLAG;
> +
> if (features & NETIF_F_LOOPBACK) {
> if (bp->link_params.loopback_mode != LOOPBACK_BMAC) {
> bp->link_params.loopback_mode = LOOPBACK_BMAC;
> diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
> b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c index 85dd294..e444e7d
> 100644
> --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
> +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
> @@ -2722,9 +2722,8 @@ static inline unsigned long bnx2x_get_q_flags(struct
> bnx2x *bp, __set_bit(BNX2X_Q_FLG_MCAST, &flags);
> }
>
> - /* Always set HW VLAN stripping */
> - __set_bit(BNX2X_Q_FLG_VLAN, &flags);
> -
> + if (bp->flags & RX_VLAN_STRIP_FLAG)
> + __set_bit(BNX2X_Q_FLG_VLAN, &flags);
>
> return flags | bnx2x_get_common_flags(bp, fp, true);
> }
> @@ -10286,12 +10285,13 @@ static int __devinit bnx2x_init_dev(struct
> pci_dev *pdev,
>
> dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
> NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_LRO |
> - NETIF_F_RXCSUM | NETIF_F_RXHASH | NETIF_F_HW_VLAN_TX;
> + NETIF_F_RXCSUM | NETIF_F_RXHASH |
> + NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
>
> dev->vlan_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM
|
> NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6 |
NETIF_F_HIGHDMA;
>
> - dev->features |= dev->hw_features | NETIF_F_HW_VLAN_RX;
> + dev->features |= dev->hw_features;
> if (bp->flags & USING_DAC_FLAG)
> dev->features |= NETIF_F_HIGHDMA;
NACK as u set the RX_VLAN_STRIP_FLAG in bp->flags before u reset the function,
thus there is a real posibility that u would handle the pending packets
(during unload) under the new stripping policy while it's not yet configured
in the HW.
thanks,
vlad
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