svn commit: r296910 - head/sys/ofed/drivers/net/mlx4

[Hans Petter Selasky]

Author: hselasky
Date: Tue Mar 15 15:53:37 2016
New Revision: 296910
URL: https://svnweb.freebsd.org/changeset/base/296910

Log:
  Use hardware computed Toeplitz hash for incoming flowids
  
  Use the Toeplitz hash value as source for the flowid. This makes the
  hash value more suitable for so-called hash bucket algorithms which
  are used in the FreeBSD's TCP/IP stack when RSS is enabled.
  
  Sponsored by:	Mellanox Technologies
  MFC after:	1 week

Modified:
  head/sys/ofed/drivers/net/mlx4/en_rx.c
  head/sys/ofed/drivers/net/mlx4/en_tx.c

Modified: head/sys/ofed/drivers/net/mlx4/en_rx.c
==============================================================================
--- head/sys/ofed/drivers/net/mlx4/en_rx.c	Tue Mar 15 15:47:26 2016	(r296909)
+++ head/sys/ofed/drivers/net/mlx4/en_rx.c	Tue Mar 15 15:53:37 2016	(r296910)
@@ -616,7 +616,8 @@ int mlx4_en_process_rx_cq(struct net_dev
 			goto next;
 		}
 
-		mb->m_pkthdr.flowid = cq->ring;
+		/* forward Toeplitz compatible hash value */
+		mb->m_pkthdr.flowid = be32_to_cpu(cqe->immed_rss_invalid);
 		M_HASHTYPE_SET(mb, M_HASHTYPE_OPAQUE);
 		mb->m_pkthdr.rcvif = dev;
 		if (be32_to_cpu(cqe->vlan_my_qpn) &

Modified: head/sys/ofed/drivers/net/mlx4/en_tx.c
==============================================================================
--- head/sys/ofed/drivers/net/mlx4/en_tx.c	Tue Mar 15 15:47:26 2016	(r296909)
+++ head/sys/ofed/drivers/net/mlx4/en_tx.c	Tue Mar 15 15:53:37 2016	(r296910)
@@ -1060,7 +1060,7 @@ mlx4_en_transmit(struct ifnet *dev, stru
 
 	/* Compute which queue to use */
 	if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
-		i = m->m_pkthdr.flowid % priv->tx_ring_num;
+		i = (m->m_pkthdr.flowid % 128) % priv->tx_ring_num;
 	}
 	else {
 		i = mlx4_en_select_queue(dev, m);