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Commit c2d09fde authored by Paul Durrant's avatar Paul Durrant Committed by David S. Miller
Browse files

xen-netback: use hash value from the frontend 



My recent patch to include/xen/interface/io/netif.h defines a new extra
info type that can be used to pass hash values between backend and guest
frontend.

This patch adds code to xen-netback to use the value in a hash extra
info fragment passed from the guest frontend in a transmit-side
(i.e. netback receive side) packet to set the skb hash accordingly.

Signed-off-by: default avatarPaul Durrant <paul.durrant@citrix.com>
Acked-by: default avatarWei Liu <wei.liu2@citrix.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f07f9893

drivers/net/xen-netback/netback.c

+27 −0
Original line number Diff line number Diff line
@@ -1510,6 +1510,33 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue, 
			}

		}



		if (extras[XEN_NETIF_EXTRA_TYPE_HASH - 1].type) {

			struct xen_netif_extra_info *extra;

			enum pkt_hash_types type = PKT_HASH_TYPE_NONE;



			extra = &extras[XEN_NETIF_EXTRA_TYPE_HASH - 1];



			switch (extra->u.hash.type) {

			case _XEN_NETIF_CTRL_HASH_TYPE_IPV4:

			case _XEN_NETIF_CTRL_HASH_TYPE_IPV6:

				type = PKT_HASH_TYPE_L3;

				break;



			case _XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP:

			case _XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP:

				type = PKT_HASH_TYPE_L4;

				break;



			default:

				break;

			}



			if (type != PKT_HASH_TYPE_NONE)

				skb_set_hash(skb,

					     *(u32 *)extra->u.hash.value,

					     type);

		}



		XENVIF_TX_CB(skb)->pending_idx = pending_idx;



		__skb_put(skb, data_len);