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Date: Sat, 2 Apr 2011 08:55:24 -0700
From: Stephen Hemminger <shemminger@...ux-foundation.org>
To: Jiri Pirko <jpirko@...hat.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, kaber@...sh.net,
fubar@...ibm.com, eric.dumazet@...il.com,
nicolas.2p.debian@...il.com, andy@...yhouse.net, xiaosuo@...il.com,
jesse@...ira.com
Subject: Re: [patch net-next-2.6] net: vlan: make non-hw-accel rx path
similar to hw-accel
On Sat, 2 Apr 2011 12:26:06 +0200
Jiri Pirko <jpirko@...hat.com> wrote:
> Now there are 2 paths for rx vlan frames. When rx-vlan-hw-accel is
> enabled, skb is untagged by NIC, vlan_tci is set and the skb gets into
> vlan code in __netif_receive_skb - vlan_hwaccel_do_receive.
>
> For non-rx-vlan-hw-accel however, tagged skb goes thru whole
> __netif_receive_skb, it's untagged in ptype_base hander and reinjected
>
> This incosistency is fixed by this patch. Vlan untagging happens early in
> __netif_receive_skb so the rest of code (ptype_all handlers, rx_handlers)
> see the skb like it was untagged by hw.
>
> Signed-off-by: Jiri Pirko <jpirko@...hat.com>
> ---
> include/linux/if_vlan.h | 10 ++-
> net/8021q/vlan.c | 8 --
> net/8021q/vlan.h | 2 -
> net/8021q/vlan_core.c | 86 +++++++++++++++++++++++-
> net/8021q/vlan_dev.c | 173 -----------------------------------------------
> net/core/dev.c | 8 ++-
> 6 files changed, 100 insertions(+), 187 deletions(-)
>
> diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
> index 635e1fa..998b299 100644
> --- a/include/linux/if_vlan.h
> +++ b/include/linux/if_vlan.h
> @@ -132,7 +132,8 @@ extern u16 vlan_dev_vlan_id(const struct net_device *dev);
>
> extern int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
> u16 vlan_tci, int polling);
> -extern bool vlan_hwaccel_do_receive(struct sk_buff **skb);
> +extern bool vlan_do_receive(struct sk_buff **skb);
> +extern struct sk_buff *vlan_untag(struct sk_buff *skb);
> extern gro_result_t
> vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
> unsigned int vlan_tci, struct sk_buff *skb);
> @@ -166,13 +167,18 @@ static inline int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
> return NET_XMIT_SUCCESS;
> }
>
> -static inline bool vlan_hwaccel_do_receive(struct sk_buff **skb)
> +static inline bool vlan_do_receive(struct sk_buff **skb)
> {
> if ((*skb)->vlan_tci & VLAN_VID_MASK)
> (*skb)->pkt_type = PACKET_OTHERHOST;
> return false;
> }
Why the added unnecessary indirection
> +inline struct sk_buff *vlan_untag(struct sk_buff *skb)
> +{
> + return skb;
> +}
This adds no value.
> static inline gro_result_t
> vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
> unsigned int vlan_tci, struct sk_buff *skb)
> diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
> index 7850412..59f0a9d 100644
> --- a/net/8021q/vlan.c
> +++ b/net/8021q/vlan.c
> @@ -49,11 +49,6 @@ const char vlan_version[] = DRV_VERSION;
> static const char vlan_copyright[] = "Ben Greear <greearb@...delatech.com>";
> static const char vlan_buggyright[] = "David S. Miller <davem@...hat.com>";
>
> -static struct packet_type vlan_packet_type __read_mostly = {
> - .type = cpu_to_be16(ETH_P_8021Q),
> - .func = vlan_skb_recv, /* VLAN receive method */
> -};
> -
> /* End of global variables definitions. */
>
> static void vlan_group_free(struct vlan_group *grp)
> @@ -688,7 +683,6 @@ static int __init vlan_proto_init(void)
> if (err < 0)
> goto err4;
>
> - dev_add_pack(&vlan_packet_type);
> vlan_ioctl_set(vlan_ioctl_handler);
> return 0;
>
> @@ -709,8 +703,6 @@ static void __exit vlan_cleanup_module(void)
>
> unregister_netdevice_notifier(&vlan_notifier_block);
>
> - dev_remove_pack(&vlan_packet_type);
> -
> unregister_pernet_subsys(&vlan_net_ops);
> rcu_barrier(); /* Wait for completion of call_rcu()'s */
>
> diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
> index 5687c9b..c3408de 100644
> --- a/net/8021q/vlan.h
> +++ b/net/8021q/vlan.h
> @@ -75,8 +75,6 @@ static inline struct vlan_dev_info *vlan_dev_info(const struct net_device *dev)
> }
>
> /* found in vlan_dev.c */
> -int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
> - struct packet_type *ptype, struct net_device *orig_dev);
> void vlan_dev_set_ingress_priority(const struct net_device *dev,
> u32 skb_prio, u16 vlan_prio);
> int vlan_dev_set_egress_priority(const struct net_device *dev,
> diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
> index ce8e3ab..bc83ecc 100644
> --- a/net/8021q/vlan_core.c
> +++ b/net/8021q/vlan_core.c
> @@ -4,7 +4,7 @@
> #include <linux/netpoll.h>
> #include "vlan.h"
>
> -bool vlan_hwaccel_do_receive(struct sk_buff **skbp)
> +bool vlan_do_receive(struct sk_buff **skbp)
> {
> struct sk_buff *skb = *skbp;
> u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK;
> @@ -88,3 +88,87 @@ gro_result_t vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
> return napi_gro_frags(napi);
> }
> EXPORT_SYMBOL(vlan_gro_frags);
> +
> +static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
> +{
> + if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
> + if (skb_cow(skb, skb_headroom(skb)) < 0)
> + skb = NULL;
> + if (skb) {
> + /* Lifted from Gleb's VLAN code... */
> + memmove(skb->data - ETH_HLEN,
> + skb->data - VLAN_ETH_HLEN, 12);
> + skb->mac_header += VLAN_HLEN;
> + }
> + }
> + return skb;
> +}
Do not mark code as 'static inline' let compiler decide.
> +static inline void vlan_set_encap_proto(struct sk_buff *skb,
> + struct vlan_hdr *vhdr)
> +{
> + __be16 proto;
> + unsigned char *rawp;
> +
> + /*
> + * Was a VLAN packet, grab the encapsulated protocol, which the layer
> + * three protocols care about.
> + */
> +
> + proto = vhdr->h_vlan_encapsulated_proto;
> + if (ntohs(proto) >= 1536) {
> + skb->protocol = proto;
> + return;
> + }
> +
> + rawp = skb->data;
> + if (*(unsigned short *) rawp == 0xFFFF)
> + /*
> + * This is a magic hack to spot IPX packets. Older Novell
> + * breaks the protocol design and runs IPX over 802.3 without
> + * an 802.2 LLC layer. We look for FFFF which isn't a used
> + * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
> + * but does for the rest.
> + */
> + skb->protocol = htons(ETH_P_802_3);
> + else
> + /*
> + * Real 802.2 LLC
> + */
> + skb->protocol = htons(ETH_P_802_2);
> +}
What about doublely tagged packets?
> +struct sk_buff *vlan_untag(struct sk_buff *skb)
> +{
> + struct vlan_hdr *vhdr;
> + u16 vlan_tci;
> +
> + if (unlikely(vlan_tx_tag_present(skb))) {
> + /* vlan_tci is already set-up so leave this for another time */
> + return skb;
> + }
> +
> + skb = skb_share_check(skb, GFP_ATOMIC);
> + if (unlikely(!skb))
> + goto err_free;
> +
> + if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
> + goto err_free;
> +
> + vhdr = (struct vlan_hdr *) skb->data;
> + vlan_tci = ntohs(vhdr->h_vlan_TCI);
> + __vlan_hwaccel_put_tag(skb, vlan_tci);
> +
> + skb_pull_rcsum(skb, VLAN_HLEN);
> + vlan_set_encap_proto(skb, vhdr);
> +
> + skb = vlan_check_reorder_header(skb);
> + if (unlikely(!skb))
> + goto err_free;
> +
> + return skb;
> +
> +err_free:
> + kfree_skb(skb);
> + return NULL;
> +}
> diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
> index e34ea9e..b4f061f 100644
> --- a/net/8021q/vlan_dev.c
> +++ b/net/8021q/vlan_dev.c
> @@ -65,179 +65,6 @@ static int vlan_dev_rebuild_header(struct sk_buff *skb)
> return 0;
> }
>
> -static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
> -{
> - if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
> - if (skb_cow(skb, skb_headroom(skb)) < 0)
> - skb = NULL;
> - if (skb) {
> - /* Lifted from Gleb's VLAN code... */
> - memmove(skb->data - ETH_HLEN,
> - skb->data - VLAN_ETH_HLEN, 12);
> - skb->mac_header += VLAN_HLEN;
> - }
> - }
> -
> - return skb;
> -}
> -
> -static inline void vlan_set_encap_proto(struct sk_buff *skb,
> - struct vlan_hdr *vhdr)
> -{
> - __be16 proto;
> - unsigned char *rawp;
> -
> - /*
> - * Was a VLAN packet, grab the encapsulated protocol, which the layer
> - * three protocols care about.
> - */
> -
> - proto = vhdr->h_vlan_encapsulated_proto;
> - if (ntohs(proto) >= 1536) {
> - skb->protocol = proto;
> - return;
> - }
> -
> - rawp = skb->data;
> - if (*(unsigned short *)rawp == 0xFFFF)
> - /*
> - * This is a magic hack to spot IPX packets. Older Novell
> - * breaks the protocol design and runs IPX over 802.3 without
> - * an 802.2 LLC layer. We look for FFFF which isn't a used
> - * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
> - * but does for the rest.
> - */
> - skb->protocol = htons(ETH_P_802_3);
> - else
> - /*
> - * Real 802.2 LLC
> - */
> - skb->protocol = htons(ETH_P_802_2);
> -}
> -
> -/*
> - * Determine the packet's protocol ID. The rule here is that we
> - * assume 802.3 if the type field is short enough to be a length.
> - * This is normal practice and works for any 'now in use' protocol.
> - *
> - * Also, at this point we assume that we ARE dealing exclusively with
> - * VLAN packets, or packets that should be made into VLAN packets based
> - * on a default VLAN ID.
> - *
> - * NOTE: Should be similar to ethernet/eth.c.
> - *
> - * SANITY NOTE: This method is called when a packet is moving up the stack
> - * towards userland. To get here, it would have already passed
> - * through the ethernet/eth.c eth_type_trans() method.
> - * SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
> - * stored UNALIGNED in the memory. RISC systems don't like
> - * such cases very much...
> - * SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
> - * aligned, so there doesn't need to be any of the unaligned
> - * stuff. It has been commented out now... --Ben
> - *
> - */
> -int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
> - struct packet_type *ptype, struct net_device *orig_dev)
> -{
> - struct vlan_hdr *vhdr;
> - struct vlan_pcpu_stats *rx_stats;
> - struct net_device *vlan_dev;
> - u16 vlan_id;
> - u16 vlan_tci;
> -
> - skb = skb_share_check(skb, GFP_ATOMIC);
> - if (skb == NULL)
> - goto err_free;
> -
> - if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
> - goto err_free;
> -
> - vhdr = (struct vlan_hdr *)skb->data;
> - vlan_tci = ntohs(vhdr->h_vlan_TCI);
> - vlan_id = vlan_tci & VLAN_VID_MASK;
> -
> - rcu_read_lock();
> - vlan_dev = vlan_find_dev(dev, vlan_id);
> -
> - /* If the VLAN device is defined, we use it.
> - * If not, and the VID is 0, it is a 802.1p packet (not
> - * really a VLAN), so we will just netif_rx it later to the
> - * original interface, but with the skb->proto set to the
> - * wrapped proto: we do nothing here.
> - */
> -
> - if (!vlan_dev) {
> - if (vlan_id) {
> - pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
> - __func__, vlan_id, dev->name);
> - goto err_unlock;
> - }
> - rx_stats = NULL;
> - } else {
> - skb->dev = vlan_dev;
> -
> - rx_stats = this_cpu_ptr(vlan_dev_info(skb->dev)->vlan_pcpu_stats);
> -
> - u64_stats_update_begin(&rx_stats->syncp);
> - rx_stats->rx_packets++;
> - rx_stats->rx_bytes += skb->len;
> -
> - skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
> -
> - pr_debug("%s: priority: %u for TCI: %hu\n",
> - __func__, skb->priority, vlan_tci);
> -
> - switch (skb->pkt_type) {
> - case PACKET_BROADCAST:
> - /* Yeah, stats collect these together.. */
> - /* stats->broadcast ++; // no such counter :-( */
> - break;
> -
> - case PACKET_MULTICAST:
> - rx_stats->rx_multicast++;
> - break;
> -
> - case PACKET_OTHERHOST:
> - /* Our lower layer thinks this is not local, let's make
> - * sure.
> - * This allows the VLAN to have a different MAC than the
> - * underlying device, and still route correctly.
> - */
> - if (!compare_ether_addr(eth_hdr(skb)->h_dest,
> - skb->dev->dev_addr))
> - skb->pkt_type = PACKET_HOST;
> - break;
> - default:
> - break;
> - }
> - u64_stats_update_end(&rx_stats->syncp);
> - }
> -
> - skb_pull_rcsum(skb, VLAN_HLEN);
> - vlan_set_encap_proto(skb, vhdr);
> -
> - if (vlan_dev) {
> - skb = vlan_check_reorder_header(skb);
> - if (!skb) {
> - rx_stats->rx_errors++;
> - goto err_unlock;
> - }
> - }
> -
> - netif_rx(skb);
> -
> - rcu_read_unlock();
> - return NET_RX_SUCCESS;
> -
> -err_unlock:
> - rcu_read_unlock();
> -err_free:
> - atomic_long_inc(&dev->rx_dropped);
> - kfree_skb(skb);
> - return NET_RX_DROP;
> -}
> -
> static inline u16
> vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
> {
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 3da9fb0..bfe9fce 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -3130,6 +3130,12 @@ another_round:
>
> __this_cpu_inc(softnet_data.processed);
>
> + if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
> + skb = vlan_untag(skb);
> + if (unlikely(!skb))
> + goto out;
> + }
This becomes a NOP, why is it here?
> #ifdef CONFIG_NET_CLS_ACT
> if (skb->tc_verd & TC_NCLS) {
> skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
> @@ -3177,7 +3183,7 @@ ncls:
> ret = deliver_skb(skb, pt_prev, orig_dev);
> pt_prev = NULL;
> }
> - if (vlan_hwaccel_do_receive(&skb)) {
> + if (vlan_do_receive(&skb)) {
> ret = __netif_receive_skb(skb);
> goto out;
> } else if (unlikely(!skb))
Why rename the function?
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