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nfp: abm: add simple RED offload 

Offload simple RED configurations.  For now support only DCTCP
like scenarios where min and max are the same.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2018-05-25 21:53:29 -07:00 committed by David S. Miller
parent 25e0036fcd
commit 8c8e6406f5
2 changed files with 92 additions and 0 deletions
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82
drivers/net/ethernet/netronome/nfp/abm/main.c
View File

@ -38,6 +38,8 @@
#include <linux/netdevice.h>
#include <linux/rcupdate.h>
#include <linux/slab.h>
#include <net/pkt_cls.h>
#include <net/pkt_sched.h>
#include "../nfpcore/nfp.h"
#include "../nfpcore/nfp_cpp.h"
@ -55,6 +57,84 @@ static u32 nfp_abm_portid(enum nfp_repr_type rtype, unsigned int id)
FIELD_PREP(NFP_ABM_PORTID_ID, id);
}
static void
nfp_abm_red_destroy(struct net_device *netdev, struct nfp_abm_link *alink,
u32 handle)
{
struct nfp_port *port = nfp_port_from_netdev(netdev);
if (handle != alink->qdiscs[0].handle)
return;
alink->qdiscs[0].handle = TC_H_UNSPEC;
port->tc_offload_cnt = 0;
nfp_abm_ctrl_set_all_q_lvls(alink, ~0);
}
static int
nfp_abm_red_replace(struct net_device *netdev, struct nfp_abm_link *alink,
struct tc_red_qopt_offload *opt)
{
struct nfp_port *port = nfp_port_from_netdev(netdev);
int err;
if (opt->set.min != opt->set.max || !opt->set.is_ecn) {
nfp_warn(alink->abm->app->cpp,
"RED offload failed - unsupported parameters\n");
err = -EINVAL;
goto err_destroy;
}
err = nfp_abm_ctrl_set_all_q_lvls(alink, opt->set.min);
if (err)
goto err_destroy;
alink->qdiscs[0].handle = opt->handle;
port->tc_offload_cnt = 1;
return 0;
err_destroy:
if (alink->qdiscs[0].handle != TC_H_UNSPEC)
nfp_abm_red_destroy(netdev, alink, alink->qdiscs[0].handle);
return err;
}
static int
nfp_abm_setup_tc_red(struct net_device *netdev, struct nfp_abm_link *alink,
struct tc_red_qopt_offload *opt)
{
if (opt->parent != TC_H_ROOT)
return -EOPNOTSUPP;
switch (opt->command) {
case TC_RED_REPLACE:
return nfp_abm_red_replace(netdev, alink, opt);
case TC_RED_DESTROY:
nfp_abm_red_destroy(netdev, alink, opt->handle);
return 0;
default:
return -EOPNOTSUPP;
}
}
static int
nfp_abm_setup_tc(struct nfp_app *app, struct net_device *netdev,
enum tc_setup_type type, void *type_data)
{
struct nfp_repr *repr = netdev_priv(netdev);
struct nfp_port *port;
port = nfp_port_from_netdev(netdev);
if (!port || port->type != NFP_PORT_PF_PORT)
return -EOPNOTSUPP;
switch (type) {
case TC_SETUP_QDISC_RED:
return nfp_abm_setup_tc_red(netdev, repr->app_priv, type_data);
default:
return -EOPNOTSUPP;
}
}
static struct net_device *nfp_abm_repr_get(struct nfp_app *app, u32 port_id)
{
enum nfp_repr_type rtype;
@ -403,6 +483,8 @@ const struct nfp_app_type app_abm = {
.vnic_alloc = nfp_abm_vnic_alloc,
.vnic_free = nfp_abm_vnic_free,
.setup_tc = nfp_abm_setup_tc,
.eswitch_mode_get = nfp_abm_eswitch_mode_get,
.eswitch_mode_set = nfp_abm_eswitch_mode_set,

10
drivers/net/ethernet/netronome/nfp/abm/main.h
View File

@ -58,18 +58,28 @@ struct nfp_abm {
const struct nfp_rtsym *q_lvls;
};
/**
* struct nfp_red_qdisc - representation of single RED Qdisc
* @handle: handle of currently offloaded RED Qdisc
*/
struct nfp_red_qdisc {
u32 handle;
};
/**
* struct nfp_abm_link - port tuple of a ABM NIC
* @abm: back pointer to nfp_abm
* @vnic: data vNIC
* @id: id of the data vNIC
* @queue_base: id of base to host queue within PCIe (not QC idx)
* @qdiscs: array of qdiscs
*/
struct nfp_abm_link {
struct nfp_abm *abm;
struct nfp_net *vnic;
unsigned int id;
unsigned int queue_base;
struct nfp_red_qdisc qdiscs[1];
};
void nfp_abm_ctrl_read_params(struct nfp_abm_link *alink);