Author: hselasky
Date: Thu Apr 7 07:33:40 2016
New Revision: 297650
URL: https://svnweb.freebsd.org/changeset/base/297650
Log:
MFC r296910:
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
Modified:
stable/9/sys/ofed/drivers/net/mlx4/en_rx.c
stable/9/sys/ofed/drivers/net/mlx4/en_tx.c
Directory Properties:
stable/9/sys/ (props changed)
Modified: stable/9/sys/ofed/drivers/net/mlx4/en_rx.c
==============================================================================
--- stable/9/sys/ofed/drivers/net/mlx4/en_rx.c Thu Apr 7 07:31:17 2016
(r297649)
+++ stable/9/sys/ofed/drivers/net/mlx4/en_rx.c Thu Apr 7 07:33:40 2016
(r297650)
@@ -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);
mb->m_flags |= M_FLOWID;
mb->m_pkthdr.rcvif = dev;
if (be32_to_cpu(cqe->vlan_my_qpn) &
Modified: stable/9/sys/ofed/drivers/net/mlx4/en_tx.c
==============================================================================
--- stable/9/sys/ofed/drivers/net/mlx4/en_tx.c Thu Apr 7 07:31:17 2016
(r297649)
+++ stable/9/sys/ofed/drivers/net/mlx4/en_tx.c Thu Apr 7 07:33:40 2016
(r297650)
@@ -1061,7 +1061,7 @@ mlx4_en_transmit(struct ifnet *dev, stru
/* Compute which queue to use */
if (m->m_flags & M_FLOWID) {
- 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);
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