[RFC 2.6.10 5/22] xfrm: Attempt to offload bundled xfrm_states for outbound xfrms

From: David Dillow (dave_at_thedillows.org)
Date: 12/30/04

  • Next message: David Dillow: "[RFC 2.6.10 10/22] AH, ESP: Add offloading of outbound packets" 
    Date:	Thu, 30 Dec 2004 03:48:35 -0500
To: netdev@oss.sgi.com

    # This is a BitKeeper generated diff -Nru style patch.
    #
    # ChangeSet
    # 2004/12/30 00:34:46-05:00 dave@thedillows.org
    # Plumb in offloading new bundles for outgoing packets.
    #
    # Signed-off-by: David Dillow <dave@thedillows.org>
    #
    # net/xfrm/xfrm_policy.c
    # 2004/12/30 00:34:28-05:00 dave@thedillows.org +28 -0
    # When we create a new bundle for an outbound flow, try to
    # offload as much as the destination driver will allow.
    #
    # Don't forget to clean up....
    #
    # Signed-off-by: David Dillow <dave@thedillows.org>
    #
    # include/net/xfrm.h
    # 2004/12/30 00:34:28-05:00 dave@thedillows.org +6 -0
    # A convenience structure for offloading bundles.
    #
    # The dst->child field gives us a singly linked list
    # from upper protocols to outer transforms. Drivers, however,
    # will likely have a limited number of offloads they can
    # perform on a particular packet, so they need to offload
    # the bundle from the outside in. This list makes it easier
    # for them.
    #
    # Signed-off-by: David Dillow <dave@thedillows.org>
    #
    # include/net/dst.h
    # 2004/12/30 00:34:28-05:00 dave@thedillows.org +1 -0
    # Add a field to store the offload information for this part
    # of the outgoing bundle (non-NULL if this dst is offloaded.)
    #
    # Signed-off-by: David Dillow <dave@thedillows.org>
    #
    diff -Nru a/include/net/dst.h b/include/net/dst.h
    --- a/include/net/dst.h 2004-12-30 01:11:18 -05:00
    +++ b/include/net/dst.h 2004-12-30 01:11:18 -05:00
    @@ -65,6 +65,7 @@
             struct neighbour *neighbour;
             struct hh_cache *hh;
             struct xfrm_state *xfrm;
    + struct xfrm_offload *xfrm_offload;
     
             int (*input)(struct sk_buff*);
             int (*output)(struct sk_buff*);
    diff -Nru a/include/net/xfrm.h b/include/net/xfrm.h
    --- a/include/net/xfrm.h 2004-12-30 01:11:18 -05:00
    +++ b/include/net/xfrm.h 2004-12-30 01:11:18 -05:00
    @@ -178,6 +178,12 @@
             atomic_t refcnt;
     };
     
    +struct xfrm_bundle_list
    +{
    + struct list_head node;
    + struct dst_entry * dst;
    +};
    +
     struct xfrm_type;
     struct xfrm_dst;
     struct xfrm_policy_afinfo {
    diff -Nru a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
    --- a/net/xfrm/xfrm_policy.c 2004-12-30 01:11:18 -05:00
    +++ b/net/xfrm/xfrm_policy.c 2004-12-30 01:11:18 -05:00
    @@ -705,6 +705,31 @@
             };
     }
     
    +static void xfrm_accel_bundle(struct dst_entry *dst)
    +{
    + struct xfrm_bundle_list bundle, *xbl, *tmp;
    + struct net_device *dev = dst->dev;
    + INIT_LIST_HEAD(&bundle.node);
    +
    + if (dev && netif_running(dev) && (dev->features & NETIF_F_IPSEC)) {
    + while (dst) {
    + xbl = kmalloc(sizeof(*xbl), GFP_ATOMIC);
    + if (!xbl)
    + goto out;
    +
    + xbl->dst = dst;
    + list_add_tail(&xbl->node, &bundle.node);
    + dst = dst->child;
    + }
    +
    + dev->xfrm_bundle_add(dev, &bundle);
    + }
    +
    +out:
    + list_for_each_entry_safe(xbl, tmp, &bundle.node, node)
    + kfree(xbl);
    +}
    +
     static int stale_bundle(struct dst_entry *dst);
     
     /* Main function: finds/creates a bundle for given flow.
    @@ -833,6 +858,7 @@
                     policy->bundles = dst;
                     dst_hold(dst);
                     write_unlock_bh(&policy->lock);
    + xfrm_accel_bundle(dst);
             }
             *dst_p = dst;
             dst_release(dst_orig);
    @@ -1023,8 +1049,10 @@
     {
             if (!dst->xfrm)
                     return;
    + xfrm_offload_release(dst->xfrm_offload);
             xfrm_state_put(dst->xfrm);
             dst->xfrm = NULL;
    + dst->xfrm_offload = NULL;
     }
     
     static void xfrm_link_failure(struct sk_buff *skb)
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

  • Next message: David Dillow: "[RFC 2.6.10 10/22] AH, ESP: Add offloading of outbound packets"

    Relevant Pages