linux/drivers/net
Ido Schimmel ff6551ec0c mlxsw: spectrum: Correctly configure headroom size
When packets ingress the switch they are assigned a switch priority and
directed to the corresponding priority group (PG) buffer in the port's
headroom buffer.

Since we now map all switch priorities to priority group 0 (PG0) by
default, there is no need to allocate the other priority groups during
initialization. The only exception is PG9, which is used for control
traffic.

At minimum, the PG should be able to store the currently classified
packet (pipeline latency isn't 0) and also the packets arriving during
the classification time. However, an incoming packet will not be
buffered if there is no available MTU-sized buffer space for storing it.

The buffer needed to accommodate for pipeline latency is variable and
needs to take into account both the current link speed and current
latency of the pipeline, which is time-dependent. Testing showed that
setting the PG's size to twice the current MTU is optimal.

Since PG9 is used strictly for control packets and not subject to flow
control, we are not going to resize it according to user configuration,
so we simply set it according to worst case scenario, which is twice the
maximum MTU.

In any case, later patches in the series will allow a user to direct
lossless flows to other PGs than PG0 and set their size to accommodate
for round-trip propagation delay.

The above change also requires us to resize the PG buffer whenever the
port's MTU is changed.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-06 17:24:17 -04:00
..
appletalk
arcnet
bonding bonding: fix bond_get_stats() 2016-03-18 23:14:15 -04:00
caif
can
cris
dsa net: dsa: mv88e6131: enable hardware bridging 2016-04-04 21:31:35 -04:00
ethernet mlxsw: spectrum: Correctly configure headroom size 2016-04-06 17:24:17 -04:00
fddi
fjes
hamradio
hippi
hyperv hv_netvsc: Fix the order of num_sc_offered decrement 2016-03-23 21:51:08 -04:00
ieee802154
ipvlan vlan: propagate gso_max_segs 2016-03-17 21:05:01 -04:00
irda irda: sh_irda: remove driver 2016-04-04 16:24:13 -04:00
phy net: phy: bcm7xxx: Add entries for Broadcom BCM7346 and BCM7362 2016-03-25 11:37:57 -04:00
plip
ppp ppp: take reference on channels netns 2016-03-23 14:35:31 -04:00
slip
team team: team should sync the port's uc/mc addrs when add a port 2016-03-30 17:06:58 -04:00
usb net: usb: cdc_ncm: adding Telit LE910 V2 mobile broadband card 2016-03-31 17:15:35 -04:00
vmxnet3 vmxnet3: fix lock imbalance in vmxnet3_tq_xmit() 2016-03-14 13:10:29 -04:00
wan farsync: fix off-by-one bug in fst_add_one 2016-03-14 13:09:49 -04:00
wimax
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-03-19 10:05:34 -07:00
xen-netback xen-netback: reduce log spam 2016-03-13 22:08:01 -04:00
dummy.c
eql.c
geneve.c geneve: fix populating tclass in geneve_get_v6_dst 2016-03-20 13:44:34 -04:00
ifb.c
Kconfig macsec: introduce IEEE 802.1AE driver 2016-03-13 22:40:24 -04:00
LICENSE.SRC
loopback.c
macsec.c macsec: introduce IEEE 802.1AE driver 2016-03-13 22:40:24 -04:00
macvlan.c vlan: propagate gso_max_segs 2016-03-17 21:05:01 -04:00
macvtap.c macvtap: always pass ethernet header in linear 2016-03-11 14:45:21 -05:00
Makefile macsec: introduce IEEE 802.1AE driver 2016-03-13 22:40:24 -04:00
mdio.c
mii.c
netconsole.c
nlmon.c
ntb_netdev.c
rionet.c rapidio/rionet: add mport removal handling 2016-03-22 15:36:02 -07:00
sb1000.c
Space.c
sungem_phy.c
tun.c sock: enable timestamping using control messages 2016-04-04 15:50:30 -04:00
veth.c
virtio_net.c virtio/vhost: new features, performance improvements, cleanups 2016-03-20 13:28:18 -07:00
vrf.c
vxlan.c vxlan: implement GPE 2016-04-06 16:50:32 -04:00
xen-netfront.c