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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e1eea81120
As its implementation shows, this is synonimous with calling
dsa_slave_dev_check followed by dsa_slave_to_port, so it is quite simple
already and provides functionality which is already there.
However there is now a need for these functions outside dsa_priv.h, for
example in drivers that perform mirroring and redirection through
tc-flower offloads (they are given raw access to the flow_cls_offload
structure), where they need to call this function on act->dev.
But simply exporting dsa_slave_to_port would make it non-inline and
would result in an extra function call in the hotpath, as can be seen
for example in sja1105:
Before:
000006dc <sja1105_xmit>:
{
6dc: e92d4ff0 push {r4, r5, r6, r7, r8, r9, sl, fp, lr}
6e0: e1a04000 mov r4, r0
6e4: e591958c ldr r9, [r1, #1420] ; 0x58c <- Inline dsa_slave_to_port
6e8: e1a05001 mov r5, r1
6ec: e24dd004 sub sp, sp, #4
u16 tx_vid = dsa_8021q_tx_vid(dp->ds, dp->index);
6f0: e1c901d8 ldrd r0, [r9, #24]
6f4: ebfffffe bl 0 <dsa_8021q_tx_vid>
6f4: R_ARM_CALL dsa_8021q_tx_vid
u8 pcp = netdev_txq_to_tc(netdev, queue_mapping);
6f8: e1d416b0 ldrh r1, [r4, #96] ; 0x60
u16 tx_vid = dsa_8021q_tx_vid(dp->ds, dp->index);
6fc: e1a08000 mov r8, r0
After:
000006e4 <sja1105_xmit>:
{
6e4: e92d4ff0 push {r4, r5, r6, r7, r8, r9, sl, fp, lr}
6e8: e1a04000 mov r4, r0
6ec: e24dd004 sub sp, sp, #4
struct dsa_port *dp = dsa_slave_to_port(netdev);
6f0: e1a00001 mov r0, r1
{
6f4: e1a05001 mov r5, r1
struct dsa_port *dp = dsa_slave_to_port(netdev);
6f8: ebfffffe bl 0 <dsa_slave_to_port>
6f8: R_ARM_CALL dsa_slave_to_port
6fc: e1a09000 mov r9, r0
u16 tx_vid = dsa_8021q_tx_vid(dp->ds, dp->index);
700: e1c001d8 ldrd r0, [r0, #24]
704: ebfffffe bl 0 <dsa_8021q_tx_vid>
704: R_ARM_CALL dsa_8021q_tx_vid
Because we want to avoid possible performance regressions, introduce
this new function which is designed to be public.
Suggested-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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| .. | ||
| 6lowpan | ||
| 9p | ||
| 802 | ||
| 8021q | ||
| appletalk | ||
| atm | ||
| ax25 | ||
| batman-adv | ||
| bluetooth | ||
| bpf | ||
| bpfilter | ||
| bridge | ||
| caif | ||
| can | ||
| ceph | ||
| core | ||
| dcb | ||
| dccp | ||
| decnet | ||
| dns_resolver | ||
| dsa | ||
| ethernet | ||
| ethtool | ||
| hsr | ||
| ieee802154 | ||
| ife | ||
| ipv4 | ||
| ipv6 | ||
| iucv | ||
| kcm | ||
| key | ||
| l2tp | ||
| l3mdev | ||
| lapb | ||
| llc | ||
| mac80211 | ||
| mac802154 | ||
| mpls | ||
| mptcp | ||
| ncsi | ||
| netfilter | ||
| netlabel | ||
| netlink | ||
| netrom | ||
| nfc | ||
| nsh | ||
| openvswitch | ||
| packet | ||
| phonet | ||
| psample | ||
| qrtr | ||
| rds | ||
| rfkill | ||
| rose | ||
| rxrpc | ||
| sched | ||
| sctp | ||
| smc | ||
| strparser | ||
| sunrpc | ||
| switchdev | ||
| tipc | ||
| tls | ||
| unix | ||
| vmw_vsock | ||
| wimax | ||
| wireless | ||
| x25 | ||
| xdp | ||
| xfrm | ||
| compat.c | ||
| Kconfig | ||
| Makefile | ||
| socket.c | ||
| sysctl_net.c | ||