This patch adds an indication that netback is capable of handling hash
values passed from the frontend (see netif.h for details), and the code
necessary to process the additional xen_netif_extra_info segment and
set a hash on the skb.
Signed-off-by: Paul Durrant <paul.durr...@citrix.com>
Cc: Ian Campbell <ian.campb...@citrix.com>
Cc: Wei Liu <wei.l...@citrix.com>
---
drivers/net/xen-netback/netback.c | 25 +++++++++++++++++++++++++
drivers/net/xen-netback/xenbus.c | 8 ++++++++
2 files changed, 33 insertions(+)
diff --git a/drivers/net/xen-netback/netback.c
b/drivers/net/xen-netback/netback.c
index 9f0c9f5..3799b5a 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1383,6 +1383,28 @@ 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;
+ u32 hash = *(u32 *)extra->u.hash.value;
+
+ extra = &extras[XEN_NETIF_EXTRA_TYPE_HASH - 1];
+
+ switch (extra->u.hash.type) {
+ case XEN_NETIF_HASH_TYPE_TCPV4:
+ case XEN_NETIF_HASH_TYPE_TCPV6:
+ skb_set_hash(skb, hash, PKT_HASH_TYPE_L4);
+ break;
+
+ case XEN_NETIF_HASH_TYPE_IPV4:
+ case XEN_NETIF_HASH_TYPE_IPV6:
+ skb_set_hash(skb, hash, PKT_HASH_TYPE_L3);
+ break;
+
+ default:
+ break;
+ }
+ }
+
XENVIF_TX_CB(skb)->pending_idx = pending_idx;
__skb_put(skb, data_len);
@@ -1416,6 +1438,9 @@ static void xenvif_tx_build_gops(struct xenvif_queue
*queue,
if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type)
queue->pending_tx_info[pending_idx].extra_count++;
+ if (extras[XEN_NETIF_EXTRA_TYPE_HASH - 1].type)
+ queue->pending_tx_info[pending_idx].extra_count++;
+
queue->pending_cons++;
gop = xenvif_get_requests(queue, skb, txfrags, gop,
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 929a6e7..2fa8a16 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -335,6 +335,14 @@ static int netback_probe(struct xenbus_device *dev,
goto abort_transaction;
}
+ /* We support hash values. */
+ err = xenbus_printf(xbt, dev->nodename,
+ "feature-hash", "%d", 1);
+ if (err) {
+ message = "writing feature-hash";
+ goto abort_transaction;
+ }
+
err = xenbus_transaction_end(xbt, 0);
} while (err == -EAGAIN);
--
2.1.4
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