[PATCH net-next 0/7] nfp: abm: move code and improve parameter validation

[PATCH net-next 0/7] nfp: abm: move code and improve parameter validation

[Jakub Kicinski]

Hi!

This set starts by separating Qdisc handling code into a new file.
Next two patches allow early access to TLV-based capabilities during
probe, previously the capabilities were parsed just before netdevs
were registered, but its cleaner to do some basic validation earlier
and avoid cleanup work.

Next three patches improve RED's parameter validation.  First we provide
a more precise message about why offload failed (and move the parameter
validation to a helper).  Next we make sure we don't set the top bit
in the 32 bit max RED threshold value.  Because FW is treating the value
as signed it reportedly causes slow downs (unnecessary queuing and
marking) when top bit is set with recent firmwares.  Last (and perhaps
least importantly) we offload the harddrop parameter of the Qdisc.
We don't plan to offload harddrop RED, but it seems prudent to make
sure user didn't set that flag as device behaviour would have differed.

Jakub Kicinski (7):
  nfp: abm: split qdisc offload code into a separate file
  nfp: pass ctrl_bar pointer to nfp_net_alloc
  nfp: parse vNIC TLV capabilities at alloc time
  nfp: abm: provide more precise info about offload parameter validation
  nfp: abm: don't set negative threshold
  net: sched: red: inform offloads about harddrop setting
  nfp: abm: refuse RED offload with harddrop set

 drivers/net/ethernet/netronome/nfp/Makefile   |   1 +
 drivers/net/ethernet/netronome/nfp/abm/main.c | 266 ----------------
 drivers/net/ethernet/netronome/nfp/abm/main.h |   9 +
 .../net/ethernet/netronome/nfp/abm/qdisc.c    | 301 ++++++++++++++++++
 drivers/net/ethernet/netronome/nfp/nfp_net.h  |   2 +-
 .../ethernet/netronome/nfp/nfp_net_common.c   |  26 +-
 .../net/ethernet/netronome/nfp/nfp_net_main.c |   4 +-
 .../ethernet/netronome/nfp/nfp_netvf_main.c   |   3 +-
 include/net/pkt_cls.h                         |   1 +
 net/sched/sch_red.c                           |   1 +
 10 files changed, 335 insertions(+), 279 deletions(-)
 create mode 100644 drivers/net/ethernet/netronome/nfp/abm/qdisc.c

-- 
2.17.1

[PATCH net-next 1/7] nfp: abm: split qdisc offload code into a separate file

[Jakub Kicinski]

The Qdisc offload code is logically separate, and we will soon
do significant surgery on it to support more Qdiscs, so move
it to a separate file.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/Makefile   |   1 +
 drivers/net/ethernet/netronome/nfp/abm/main.c | 266 -----------------
 drivers/net/ethernet/netronome/nfp/abm/main.h |   6 +
 .../net/ethernet/netronome/nfp/abm/qdisc.c    | 272 ++++++++++++++++++
 4 files changed, 279 insertions(+), 266 deletions(-)
 create mode 100644 drivers/net/ethernet/netronome/nfp/abm/qdisc.c

diff --git a/drivers/net/ethernet/netronome/nfp/Makefile b/drivers/net/ethernet/netronome/nfp/Makefile
index 4afb10375397..190e8b56a41f 100644
--- a/drivers/net/ethernet/netronome/nfp/Makefile
+++ b/drivers/net/ethernet/netronome/nfp/Makefile
@@ -57,6 +57,7 @@ endif
 ifeq ($(CONFIG_NFP_APP_ABM_NIC),y)
 nfp-objs += \
 	    abm/ctrl.o \
+	    abm/qdisc.o \
 	    abm/main.o
 endif
 
diff --git a/drivers/net/ethernet/netronome/nfp/abm/main.c b/drivers/net/ethernet/netronome/nfp/abm/main.c
index c0830c0c2c3f..3d15de0ae271 100644
--- a/drivers/net/ethernet/netronome/nfp/abm/main.c
+++ b/drivers/net/ethernet/netronome/nfp/abm/main.c
@@ -7,9 +7,6 @@
 #include <linux/netdevice.h>
 #include <linux/rcupdate.h>
 #include <linux/slab.h>
-#include <net/pkt_cls.h>
-#include <net/pkt_sched.h>
-#include <net/red.h>
 
 #include "../nfpcore/nfp.h"
 #include "../nfpcore/nfp_cpp.h"
@@ -27,269 +24,6 @@ static u32 nfp_abm_portid(enum nfp_repr_type rtype, unsigned int id)
 	       FIELD_PREP(NFP_ABM_PORTID_ID, id);
 }
 
-static int
-__nfp_abm_reset_root(struct net_device *netdev, struct nfp_abm_link *alink,
-		     u32 handle, unsigned int qs, u32 init_val)
-{
-	struct nfp_port *port = nfp_port_from_netdev(netdev);
-	int ret;
-
-	ret = nfp_abm_ctrl_set_all_q_lvls(alink, init_val);
-	memset(alink->qdiscs, 0, sizeof(*alink->qdiscs) * alink->num_qdiscs);
-
-	alink->parent = handle;
-	alink->num_qdiscs = qs;
-	port->tc_offload_cnt = qs;
-
-	return ret;
-}
-
-static void
-nfp_abm_reset_root(struct net_device *netdev, struct nfp_abm_link *alink,
-		   u32 handle, unsigned int qs)
-{
-	__nfp_abm_reset_root(netdev, alink, handle, qs, ~0);
-}
-
-static int
-nfp_abm_red_find(struct nfp_abm_link *alink, struct tc_red_qopt_offload *opt)
-{
-	unsigned int i = TC_H_MIN(opt->parent) - 1;
-
-	if (opt->parent == TC_H_ROOT)
-		i = 0;
-	else if (TC_H_MAJ(alink->parent) == TC_H_MAJ(opt->parent))
-		i = TC_H_MIN(opt->parent) - 1;
-	else
-		return -EOPNOTSUPP;
-
-	if (i >= alink->num_qdiscs || opt->handle != alink->qdiscs[i].handle)
-		return -EOPNOTSUPP;
-
-	return i;
-}
-
-static void
-nfp_abm_red_destroy(struct net_device *netdev, struct nfp_abm_link *alink,
-		    u32 handle)
-{
-	unsigned int i;
-
-	for (i = 0; i < alink->num_qdiscs; i++)
-		if (handle == alink->qdiscs[i].handle)
-			break;
-	if (i == alink->num_qdiscs)
-		return;
-
-	if (alink->parent == TC_H_ROOT) {
-		nfp_abm_reset_root(netdev, alink, TC_H_ROOT, 0);
-	} else {
-		nfp_abm_ctrl_set_q_lvl(alink, i, ~0);
-		memset(&alink->qdiscs[i], 0, sizeof(*alink->qdiscs));
-	}
-}
-
-static int
-nfp_abm_red_replace(struct net_device *netdev, struct nfp_abm_link *alink,
-		    struct tc_red_qopt_offload *opt)
-{
-	bool existing;
-	int i, err;
-
-	i = nfp_abm_red_find(alink, opt);
-	existing = i >= 0;
-
-	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;
-	}
-
-	if (existing) {
-		if (alink->parent == TC_H_ROOT)
-			err = nfp_abm_ctrl_set_all_q_lvls(alink, opt->set.min);
-		else
-			err = nfp_abm_ctrl_set_q_lvl(alink, i, opt->set.min);
-		if (err)
-			goto err_destroy;
-		return 0;
-	}
-
-	if (opt->parent == TC_H_ROOT) {
-		i = 0;
-		err = __nfp_abm_reset_root(netdev, alink, TC_H_ROOT, 1,
-					   opt->set.min);
-	} else if (TC_H_MAJ(alink->parent) == TC_H_MAJ(opt->parent)) {
-		i = TC_H_MIN(opt->parent) - 1;
-		err = nfp_abm_ctrl_set_q_lvl(alink, i, opt->set.min);
-	} else {
-		return -EINVAL;
-	}
-	/* Set the handle to try full clean up, in case IO failed */
-	alink->qdiscs[i].handle = opt->handle;
-	if (err)
-		goto err_destroy;
-
-	if (opt->parent == TC_H_ROOT)
-		err = nfp_abm_ctrl_read_stats(alink, &alink->qdiscs[i].stats);
-	else
-		err = nfp_abm_ctrl_read_q_stats(alink, i,
-						&alink->qdiscs[i].stats);
-	if (err)
-		goto err_destroy;
-
-	if (opt->parent == TC_H_ROOT)
-		err = nfp_abm_ctrl_read_xstats(alink,
-					       &alink->qdiscs[i].xstats);
-	else
-		err = nfp_abm_ctrl_read_q_xstats(alink, i,
-						 &alink->qdiscs[i].xstats);
-	if (err)
-		goto err_destroy;
-
-	alink->qdiscs[i].stats.backlog_pkts = 0;
-	alink->qdiscs[i].stats.backlog_bytes = 0;
-
-	return 0;
-err_destroy:
-	/* If the qdisc keeps on living, but we can't offload undo changes */
-	if (existing) {
-		opt->set.qstats->qlen -= alink->qdiscs[i].stats.backlog_pkts;
-		opt->set.qstats->backlog -=
-			alink->qdiscs[i].stats.backlog_bytes;
-	}
-	nfp_abm_red_destroy(netdev, alink, opt->handle);
-
-	return err;
-}
-
-static void
-nfp_abm_update_stats(struct nfp_alink_stats *new, struct nfp_alink_stats *old,
-		     struct tc_qopt_offload_stats *stats)
-{
-	_bstats_update(stats->bstats, new->tx_bytes - old->tx_bytes,
-		       new->tx_pkts - old->tx_pkts);
-	stats->qstats->qlen += new->backlog_pkts - old->backlog_pkts;
-	stats->qstats->backlog += new->backlog_bytes - old->backlog_bytes;
-	stats->qstats->overlimits += new->overlimits - old->overlimits;
-	stats->qstats->drops += new->drops - old->drops;
-}
-
-static int
-nfp_abm_red_stats(struct nfp_abm_link *alink, struct tc_red_qopt_offload *opt)
-{
-	struct nfp_alink_stats *prev_stats;
-	struct nfp_alink_stats stats;
-	int i, err;
-
-	i = nfp_abm_red_find(alink, opt);
-	if (i < 0)
-		return i;
-	prev_stats = &alink->qdiscs[i].stats;
-
-	if (alink->parent == TC_H_ROOT)
-		err = nfp_abm_ctrl_read_stats(alink, &stats);
-	else
-		err = nfp_abm_ctrl_read_q_stats(alink, i, &stats);
-	if (err)
-		return err;
-
-	nfp_abm_update_stats(&stats, prev_stats, &opt->stats);
-
-	*prev_stats = stats;
-
-	return 0;
-}
-
-static int
-nfp_abm_red_xstats(struct nfp_abm_link *alink, struct tc_red_qopt_offload *opt)
-{
-	struct nfp_alink_xstats *prev_xstats;
-	struct nfp_alink_xstats xstats;
-	int i, err;
-
-	i = nfp_abm_red_find(alink, opt);
-	if (i < 0)
-		return i;
-	prev_xstats = &alink->qdiscs[i].xstats;
-
-	if (alink->parent == TC_H_ROOT)
-		err = nfp_abm_ctrl_read_xstats(alink, &xstats);
-	else
-		err = nfp_abm_ctrl_read_q_xstats(alink, i, &xstats);
-	if (err)
-		return err;
-
-	opt->xstats->forced_mark += xstats.ecn_marked - prev_xstats->ecn_marked;
-	opt->xstats->pdrop += xstats.pdrop - prev_xstats->pdrop;
-
-	*prev_xstats = xstats;
-
-	return 0;
-}
-
-static int
-nfp_abm_setup_tc_red(struct net_device *netdev, struct nfp_abm_link *alink,
-		     struct tc_red_qopt_offload *opt)
-{
-	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;
-	case TC_RED_STATS:
-		return nfp_abm_red_stats(alink, opt);
-	case TC_RED_XSTATS:
-		return nfp_abm_red_xstats(alink, opt);
-	default:
-		return -EOPNOTSUPP;
-	}
-}
-
-static int
-nfp_abm_mq_stats(struct nfp_abm_link *alink, struct tc_mq_qopt_offload *opt)
-{
-	struct nfp_alink_stats stats;
-	unsigned int i;
-	int err;
-
-	for (i = 0; i < alink->num_qdiscs; i++) {
-		if (alink->qdiscs[i].handle == TC_H_UNSPEC)
-			continue;
-
-		err = nfp_abm_ctrl_read_q_stats(alink, i, &stats);
-		if (err)
-			return err;
-
-		nfp_abm_update_stats(&stats, &alink->qdiscs[i].stats,
-				     &opt->stats);
-	}
-
-	return 0;
-}
-
-static int
-nfp_abm_setup_tc_mq(struct net_device *netdev, struct nfp_abm_link *alink,
-		    struct tc_mq_qopt_offload *opt)
-{
-	switch (opt->command) {
-	case TC_MQ_CREATE:
-		nfp_abm_reset_root(netdev, alink, opt->handle,
-				   alink->total_queues);
-		return 0;
-	case TC_MQ_DESTROY:
-		if (opt->handle == alink->parent)
-			nfp_abm_reset_root(netdev, alink, TC_H_ROOT, 0);
-		return 0;
-	case TC_MQ_STATS:
-		return nfp_abm_mq_stats(alink, opt);
-	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)
diff --git a/drivers/net/ethernet/netronome/nfp/abm/main.h b/drivers/net/ethernet/netronome/nfp/abm/main.h
index f907b7d98917..c617d213e406 100644
--- a/drivers/net/ethernet/netronome/nfp/abm/main.h
+++ b/drivers/net/ethernet/netronome/nfp/abm/main.h
@@ -5,6 +5,7 @@
 #define __NFP_ABM_H__ 1
 
 #include <net/devlink.h>
+#include <net/pkt_cls.h>
 
 struct nfp_app;
 struct nfp_net;
@@ -91,6 +92,11 @@ struct nfp_abm_link {
 	struct nfp_red_qdisc *qdiscs;
 };
 
+int nfp_abm_setup_tc_red(struct net_device *netdev, struct nfp_abm_link *alink,
+			 struct tc_red_qopt_offload *opt);
+int nfp_abm_setup_tc_mq(struct net_device *netdev, struct nfp_abm_link *alink,
+			struct tc_mq_qopt_offload *opt);
+
 void nfp_abm_ctrl_read_params(struct nfp_abm_link *alink);
 int nfp_abm_ctrl_find_addrs(struct nfp_abm *abm);
 int nfp_abm_ctrl_set_all_q_lvls(struct nfp_abm_link *alink, u32 val);
diff --git a/drivers/net/ethernet/netronome/nfp/abm/qdisc.c b/drivers/net/ethernet/netronome/nfp/abm/qdisc.c
new file mode 100644
index 000000000000..f36da95827ee
--- /dev/null
+++ b/drivers/net/ethernet/netronome/nfp/abm/qdisc.c
@@ -0,0 +1,272 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/* Copyright (C) 2018 Netronome Systems, Inc. */
+
+#include <net/pkt_cls.h>
+#include <net/pkt_sched.h>
+#include <net/red.h>
+
+#include "../nfpcore/nfp_cpp.h"
+#include "../nfp_app.h"
+#include "../nfp_port.h"
+#include "main.h"
+
+static int
+__nfp_abm_reset_root(struct net_device *netdev, struct nfp_abm_link *alink,
+		     u32 handle, unsigned int qs, u32 init_val)
+{
+	struct nfp_port *port = nfp_port_from_netdev(netdev);
+	int ret;
+
+	ret = nfp_abm_ctrl_set_all_q_lvls(alink, init_val);
+	memset(alink->qdiscs, 0, sizeof(*alink->qdiscs) * alink->num_qdiscs);
+
+	alink->parent = handle;
+	alink->num_qdiscs = qs;
+	port->tc_offload_cnt = qs;
+
+	return ret;
+}
+
+static void
+nfp_abm_reset_root(struct net_device *netdev, struct nfp_abm_link *alink,
+		   u32 handle, unsigned int qs)
+{
+	__nfp_abm_reset_root(netdev, alink, handle, qs, ~0);
+}
+
+static int
+nfp_abm_red_find(struct nfp_abm_link *alink, struct tc_red_qopt_offload *opt)
+{
+	unsigned int i = TC_H_MIN(opt->parent) - 1;
+
+	if (opt->parent == TC_H_ROOT)
+		i = 0;
+	else if (TC_H_MAJ(alink->parent) == TC_H_MAJ(opt->parent))
+		i = TC_H_MIN(opt->parent) - 1;
+	else
+		return -EOPNOTSUPP;
+
+	if (i >= alink->num_qdiscs || opt->handle != alink->qdiscs[i].handle)
+		return -EOPNOTSUPP;
+
+	return i;
+}
+
+static void
+nfp_abm_red_destroy(struct net_device *netdev, struct nfp_abm_link *alink,
+		    u32 handle)
+{
+	unsigned int i;
+
+	for (i = 0; i < alink->num_qdiscs; i++)
+		if (handle == alink->qdiscs[i].handle)
+			break;
+	if (i == alink->num_qdiscs)
+		return;
+
+	if (alink->parent == TC_H_ROOT) {
+		nfp_abm_reset_root(netdev, alink, TC_H_ROOT, 0);
+	} else {
+		nfp_abm_ctrl_set_q_lvl(alink, i, ~0);
+		memset(&alink->qdiscs[i], 0, sizeof(*alink->qdiscs));
+	}
+}
+
+static int
+nfp_abm_red_replace(struct net_device *netdev, struct nfp_abm_link *alink,
+		    struct tc_red_qopt_offload *opt)
+{
+	bool existing;
+	int i, err;
+
+	i = nfp_abm_red_find(alink, opt);
+	existing = i >= 0;
+
+	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;
+	}
+
+	if (existing) {
+		if (alink->parent == TC_H_ROOT)
+			err = nfp_abm_ctrl_set_all_q_lvls(alink, opt->set.min);
+		else
+			err = nfp_abm_ctrl_set_q_lvl(alink, i, opt->set.min);
+		if (err)
+			goto err_destroy;
+		return 0;
+	}
+
+	if (opt->parent == TC_H_ROOT) {
+		i = 0;
+		err = __nfp_abm_reset_root(netdev, alink, TC_H_ROOT, 1,
+					   opt->set.min);
+	} else if (TC_H_MAJ(alink->parent) == TC_H_MAJ(opt->parent)) {
+		i = TC_H_MIN(opt->parent) - 1;
+		err = nfp_abm_ctrl_set_q_lvl(alink, i, opt->set.min);
+	} else {
+		return -EINVAL;
+	}
+	/* Set the handle to try full clean up, in case IO failed */
+	alink->qdiscs[i].handle = opt->handle;
+	if (err)
+		goto err_destroy;
+
+	if (opt->parent == TC_H_ROOT)
+		err = nfp_abm_ctrl_read_stats(alink, &alink->qdiscs[i].stats);
+	else
+		err = nfp_abm_ctrl_read_q_stats(alink, i,
+						&alink->qdiscs[i].stats);
+	if (err)
+		goto err_destroy;
+
+	if (opt->parent == TC_H_ROOT)
+		err = nfp_abm_ctrl_read_xstats(alink,
+					       &alink->qdiscs[i].xstats);
+	else
+		err = nfp_abm_ctrl_read_q_xstats(alink, i,
+						 &alink->qdiscs[i].xstats);
+	if (err)
+		goto err_destroy;
+
+	alink->qdiscs[i].stats.backlog_pkts = 0;
+	alink->qdiscs[i].stats.backlog_bytes = 0;
+
+	return 0;
+err_destroy:
+	/* If the qdisc keeps on living, but we can't offload undo changes */
+	if (existing) {
+		opt->set.qstats->qlen -= alink->qdiscs[i].stats.backlog_pkts;
+		opt->set.qstats->backlog -=
+			alink->qdiscs[i].stats.backlog_bytes;
+	}
+	nfp_abm_red_destroy(netdev, alink, opt->handle);
+
+	return err;
+}
+
+static void
+nfp_abm_update_stats(struct nfp_alink_stats *new, struct nfp_alink_stats *old,
+		     struct tc_qopt_offload_stats *stats)
+{
+	_bstats_update(stats->bstats, new->tx_bytes - old->tx_bytes,
+		       new->tx_pkts - old->tx_pkts);
+	stats->qstats->qlen += new->backlog_pkts - old->backlog_pkts;
+	stats->qstats->backlog += new->backlog_bytes - old->backlog_bytes;
+	stats->qstats->overlimits += new->overlimits - old->overlimits;
+	stats->qstats->drops += new->drops - old->drops;
+}
+
+static int
+nfp_abm_red_stats(struct nfp_abm_link *alink, struct tc_red_qopt_offload *opt)
+{
+	struct nfp_alink_stats *prev_stats;
+	struct nfp_alink_stats stats;
+	int i, err;
+
+	i = nfp_abm_red_find(alink, opt);
+	if (i < 0)
+		return i;
+	prev_stats = &alink->qdiscs[i].stats;
+
+	if (alink->parent == TC_H_ROOT)
+		err = nfp_abm_ctrl_read_stats(alink, &stats);
+	else
+		err = nfp_abm_ctrl_read_q_stats(alink, i, &stats);
+	if (err)
+		return err;
+
+	nfp_abm_update_stats(&stats, prev_stats, &opt->stats);
+
+	*prev_stats = stats;
+
+	return 0;
+}
+
+static int
+nfp_abm_red_xstats(struct nfp_abm_link *alink, struct tc_red_qopt_offload *opt)
+{
+	struct nfp_alink_xstats *prev_xstats;
+	struct nfp_alink_xstats xstats;
+	int i, err;
+
+	i = nfp_abm_red_find(alink, opt);
+	if (i < 0)
+		return i;
+	prev_xstats = &alink->qdiscs[i].xstats;
+
+	if (alink->parent == TC_H_ROOT)
+		err = nfp_abm_ctrl_read_xstats(alink, &xstats);
+	else
+		err = nfp_abm_ctrl_read_q_xstats(alink, i, &xstats);
+	if (err)
+		return err;
+
+	opt->xstats->forced_mark += xstats.ecn_marked - prev_xstats->ecn_marked;
+	opt->xstats->pdrop += xstats.pdrop - prev_xstats->pdrop;
+
+	*prev_xstats = xstats;
+
+	return 0;
+}
+
+int nfp_abm_setup_tc_red(struct net_device *netdev, struct nfp_abm_link *alink,
+			 struct tc_red_qopt_offload *opt)
+{
+	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;
+	case TC_RED_STATS:
+		return nfp_abm_red_stats(alink, opt);
+	case TC_RED_XSTATS:
+		return nfp_abm_red_xstats(alink, opt);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int
+nfp_abm_mq_stats(struct nfp_abm_link *alink, struct tc_mq_qopt_offload *opt)
+{
+	struct nfp_alink_stats stats;
+	unsigned int i;
+	int err;
+
+	for (i = 0; i < alink->num_qdiscs; i++) {
+		if (alink->qdiscs[i].handle == TC_H_UNSPEC)
+			continue;
+
+		err = nfp_abm_ctrl_read_q_stats(alink, i, &stats);
+		if (err)
+			return err;
+
+		nfp_abm_update_stats(&stats, &alink->qdiscs[i].stats,
+				     &opt->stats);
+	}
+
+	return 0;
+}
+
+int nfp_abm_setup_tc_mq(struct net_device *netdev, struct nfp_abm_link *alink,
+			struct tc_mq_qopt_offload *opt)
+{
+	switch (opt->command) {
+	case TC_MQ_CREATE:
+		nfp_abm_reset_root(netdev, alink, opt->handle,
+				   alink->total_queues);
+		return 0;
+	case TC_MQ_DESTROY:
+		if (opt->handle == alink->parent)
+			nfp_abm_reset_root(netdev, alink, TC_H_ROOT, 0);
+		return 0;
+	case TC_MQ_STATS:
+		return nfp_abm_mq_stats(alink, opt);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
-- 
2.17.1

[PATCH net-next 2/7] nfp: pass ctrl_bar pointer to nfp_net_alloc

[Jakub Kicinski]

Move setting ctrl_bar pointer to the nfp_net_alloc function,
to make sure we can parse capabilities early in the following
patch.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net.h        | 2 +-
 drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 8 +++++---
 drivers/net/ethernet/netronome/nfp/nfp_net_main.c   | 4 ++--
 drivers/net/ethernet/netronome/nfp/nfp_netvf_main.c | 3 +--
 4 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net.h b/drivers/net/ethernet/netronome/nfp/nfp_net.h
index 6f0c37d09256..dda02fefc806 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net.h
@@ -851,7 +851,7 @@ void nfp_net_get_fw_version(struct nfp_net_fw_version *fw_ver,
 			    void __iomem *ctrl_bar);
 
 struct nfp_net *
-nfp_net_alloc(struct pci_dev *pdev, bool needs_netdev,
+nfp_net_alloc(struct pci_dev *pdev, void __iomem *ctrl_bar, bool needs_netdev,
 	      unsigned int max_tx_rings, unsigned int max_rx_rings);
 void nfp_net_free(struct nfp_net *nn);
 
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 6bddfcfdec34..54ce8353715f 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -3560,6 +3560,7 @@ void nfp_net_info(struct nfp_net *nn)
 /**
  * nfp_net_alloc() - Allocate netdev and related structure
  * @pdev:         PCI device
+ * @ctrl_bar:     PCI IOMEM with vNIC config memory
  * @needs_netdev: Whether to allocate a netdev for this vNIC
  * @max_tx_rings: Maximum number of TX rings supported by device
  * @max_rx_rings: Maximum number of RX rings supported by device
@@ -3570,9 +3571,9 @@ void nfp_net_info(struct nfp_net *nn)
  *
  * Return: NFP Net device structure, or ERR_PTR on error.
  */
-struct nfp_net *nfp_net_alloc(struct pci_dev *pdev, bool needs_netdev,
-			      unsigned int max_tx_rings,
-			      unsigned int max_rx_rings)
+struct nfp_net *
+nfp_net_alloc(struct pci_dev *pdev, void __iomem *ctrl_bar, bool needs_netdev,
+	      unsigned int max_tx_rings, unsigned int max_rx_rings)
 {
 	struct nfp_net *nn;
 
@@ -3594,6 +3595,7 @@ struct nfp_net *nfp_net_alloc(struct pci_dev *pdev, bool needs_netdev,
 	}
 
 	nn->dp.dev = &pdev->dev;
+	nn->dp.ctrl_bar = ctrl_bar;
 	nn->pdev = pdev;
 
 	nn->max_tx_rings = max_tx_rings;
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_main.c b/drivers/net/ethernet/netronome/nfp/nfp_net_main.c
index 1e7d20468a34..08f5fdbd8e41 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_main.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_main.c
@@ -116,13 +116,13 @@ nfp_net_pf_alloc_vnic(struct nfp_pf *pf, bool needs_netdev,
 	n_rx_rings = readl(ctrl_bar + NFP_NET_CFG_MAX_RXRINGS);
 
 	/* Allocate and initialise the vNIC */
-	nn = nfp_net_alloc(pf->pdev, needs_netdev, n_tx_rings, n_rx_rings);
+	nn = nfp_net_alloc(pf->pdev, ctrl_bar, needs_netdev,
+			   n_tx_rings, n_rx_rings);
 	if (IS_ERR(nn))
 		return nn;
 
 	nn->app = pf->app;
 	nfp_net_get_fw_version(&nn->fw_ver, ctrl_bar);
-	nn->dp.ctrl_bar = ctrl_bar;
 	nn->tx_bar = qc_bar + tx_base * NFP_QCP_QUEUE_ADDR_SZ;
 	nn->rx_bar = qc_bar + rx_base * NFP_QCP_QUEUE_ADDR_SZ;
 	nn->dp.is_vf = 0;
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_netvf_main.c b/drivers/net/ethernet/netronome/nfp/nfp_netvf_main.c
index d2c1e9ea5668..1145849ca7ba 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_netvf_main.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_netvf_main.c
@@ -172,7 +172,7 @@ static int nfp_netvf_pci_probe(struct pci_dev *pdev,
 	rx_bar_off = NFP_PCIE_QUEUE(startq);
 
 	/* Allocate and initialise the netdev */
-	nn = nfp_net_alloc(pdev, true, max_tx_rings, max_rx_rings);
+	nn = nfp_net_alloc(pdev, ctrl_bar, true, max_tx_rings, max_rx_rings);
 	if (IS_ERR(nn)) {
 		err = PTR_ERR(nn);
 		goto err_ctrl_unmap;
@@ -180,7 +180,6 @@ static int nfp_netvf_pci_probe(struct pci_dev *pdev,
 	vf->nn = nn;
 
 	nn->fw_ver = fw_ver;
-	nn->dp.ctrl_bar = ctrl_bar;
 	nn->dp.is_vf = 1;
 	nn->stride_tx = stride;
 	nn->stride_rx = stride;
-- 
2.17.1

[PATCH net-next 3/7] nfp: parse vNIC TLV capabilities at alloc time

[Jakub Kicinski]

In certain cases initialization logic which follows allocation of
the vNIC structure may want to validate the capabilities of that vNIC.
This is easy before vNIC is initialized for normal capabilities which
are at fixed offsets in control memory, easy to locate and read, but
poses a challenge if the capabilities are in form of TLVs.  Parse
the TLVs early on so other code can just access parsed info, instead
of having to do the parsing by itself.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
---
 .../ethernet/netronome/nfp/nfp_net_common.c    | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 54ce8353715f..e00d5a2a41ee 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -3576,6 +3576,7 @@ nfp_net_alloc(struct pci_dev *pdev, void __iomem *ctrl_bar, bool needs_netdev,
 	      unsigned int max_tx_rings, unsigned int max_rx_rings)
 {
 	struct nfp_net *nn;
+	int err;
 
 	if (needs_netdev) {
 		struct net_device *netdev;
@@ -3618,7 +3619,19 @@ nfp_net_alloc(struct pci_dev *pdev, void __iomem *ctrl_bar, bool needs_netdev,
 
 	timer_setup(&nn->reconfig_timer, nfp_net_reconfig_timer, 0);
 
+	err = nfp_net_tlv_caps_parse(&nn->pdev->dev, nn->dp.ctrl_bar,
+				     &nn->tlv_caps);
+	if (err)
+		goto err_free_nn;
+
 	return nn;
+
+err_free_nn:
+	if (nn->dp.netdev)
+		free_netdev(nn->dp.netdev);
+	else
+		vfree(nn);
+	return ERR_PTR(err);
 }
 
 /**
@@ -3891,11 +3904,6 @@ int nfp_net_init(struct nfp_net *nn)
 		nn->dp.ctrl |= NFP_NET_CFG_CTRL_IRQMOD;
 	}
 
-	err = nfp_net_tlv_caps_parse(&nn->pdev->dev, nn->dp.ctrl_bar,
-				     &nn->tlv_caps);
-	if (err)
-		return err;
-
 	if (nn->dp.netdev)
 		nfp_net_netdev_init(nn);
 
-- 
2.17.1

[PATCH net-next 4/7] nfp: abm: provide more precise info about offload parameter validation

[Jakub Kicinski]

Improve log messages printed when RED can't be offloaded because
of Qdisc parameters.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
---
 .../net/ethernet/netronome/nfp/abm/qdisc.c    | 24 ++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/abm/qdisc.c b/drivers/net/ethernet/netronome/nfp/abm/qdisc.c
index f36da95827ee..04b91cc12434 100644
--- a/drivers/net/ethernet/netronome/nfp/abm/qdisc.c
+++ b/drivers/net/ethernet/netronome/nfp/abm/qdisc.c
@@ -72,6 +72,26 @@ nfp_abm_red_destroy(struct net_device *netdev, struct nfp_abm_link *alink,
 	}
 }
 
+static bool
+nfp_abm_red_check_params(struct nfp_abm_link *alink,
+			 struct tc_red_qopt_offload *opt)
+{
+	struct nfp_cpp *cpp = alink->abm->app->cpp;
+
+	if (!opt->set.is_ecn) {
+		nfp_warn(cpp, "RED offload failed - drop is not supported (ECN option required) (p:%08x h:%08x)\n",
+			 opt->parent, opt->handle);
+		return false;
+	}
+	if (opt->set.min != opt->set.max) {
+		nfp_warn(cpp, "RED offload failed - unsupported min/max parameters (p:%08x h:%08x)\n",
+			 opt->parent, opt->handle);
+		return false;
+	}
+
+	return true;
+}
+
 static int
 nfp_abm_red_replace(struct net_device *netdev, struct nfp_abm_link *alink,
 		    struct tc_red_qopt_offload *opt)
@@ -82,9 +102,7 @@ nfp_abm_red_replace(struct net_device *netdev, struct nfp_abm_link *alink,
 	i = nfp_abm_red_find(alink, opt);
 	existing = i >= 0;
 
-	if (opt->set.min != opt->set.max || !opt->set.is_ecn) {
-		nfp_warn(alink->abm->app->cpp,
-			 "RED offload failed - unsupported parameters\n");
+	if (!nfp_abm_red_check_params(alink, opt)) {
 		err = -EINVAL;
 		goto err_destroy;
 	}
-- 
2.17.1

[PATCH net-next 5/7] nfp: abm: don't set negative threshold

[Jakub Kicinski]

Turns out the threshold value is used in signed compares in the FW,
so we should avoid setting the top bit.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/abm/main.h  |  3 +++
 drivers/net/ethernet/netronome/nfp/abm/qdisc.c | 10 ++++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/abm/main.h b/drivers/net/ethernet/netronome/nfp/abm/main.h
index c617d213e406..3774c063e419 100644
--- a/drivers/net/ethernet/netronome/nfp/abm/main.h
+++ b/drivers/net/ethernet/netronome/nfp/abm/main.h
@@ -4,9 +4,12 @@
 #ifndef __NFP_ABM_H__
 #define __NFP_ABM_H__ 1
 
+#include <linux/bits.h>
 #include <net/devlink.h>
 #include <net/pkt_cls.h>
 
+#define NFP_ABM_LVL_INFINITY		S32_MAX
+
 struct nfp_app;
 struct nfp_net;
 
diff --git a/drivers/net/ethernet/netronome/nfp/abm/qdisc.c b/drivers/net/ethernet/netronome/nfp/abm/qdisc.c
index 04b91cc12434..979afb3ea855 100644
--- a/drivers/net/ethernet/netronome/nfp/abm/qdisc.c
+++ b/drivers/net/ethernet/netronome/nfp/abm/qdisc.c
@@ -31,7 +31,7 @@ static void
 nfp_abm_reset_root(struct net_device *netdev, struct nfp_abm_link *alink,
 		   u32 handle, unsigned int qs)
 {
-	__nfp_abm_reset_root(netdev, alink, handle, qs, ~0);
+	__nfp_abm_reset_root(netdev, alink, handle, qs, NFP_ABM_LVL_INFINITY);
 }
 
 static int
@@ -67,7 +67,7 @@ nfp_abm_red_destroy(struct net_device *netdev, struct nfp_abm_link *alink,
 	if (alink->parent == TC_H_ROOT) {
 		nfp_abm_reset_root(netdev, alink, TC_H_ROOT, 0);
 	} else {
-		nfp_abm_ctrl_set_q_lvl(alink, i, ~0);
+		nfp_abm_ctrl_set_q_lvl(alink, i, NFP_ABM_LVL_INFINITY);
 		memset(&alink->qdiscs[i], 0, sizeof(*alink->qdiscs));
 	}
 }
@@ -88,6 +88,12 @@ nfp_abm_red_check_params(struct nfp_abm_link *alink,
 			 opt->parent, opt->handle);
 		return false;
 	}
+	if (opt->set.min > NFP_ABM_LVL_INFINITY) {
+		nfp_warn(cpp, "RED offload failed - threshold too large %d > %d (p:%08x h:%08x)\n",
+			 opt->set.min, NFP_ABM_LVL_INFINITY, opt->parent,
+			 opt->handle);
+		return false;
+	}
 
 	return true;
 }
-- 
2.17.1

[PATCH net-next 6/7] net: sched: red: inform offloads about harddrop setting

[Jakub Kicinski]

To mirror software behaviour on offload more precisely inform
the drivers about the state of the harddrop flag.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
---
 include/net/pkt_cls.h | 1 +
 net/sched/sch_red.c   | 1 +
 2 files changed, 2 insertions(+)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 72ffb3120ced..00f71644fbcd 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -807,6 +807,7 @@ struct tc_red_qopt_offload_params {
 	u32 max;
 	u32 probability;
 	bool is_ecn;
+	bool is_harddrop;
 	struct gnet_stats_queue *qstats;
 };
 
diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index 7682f7a618a1..a1d08bdd9357 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -167,6 +167,7 @@ static int red_offload(struct Qdisc *sch, bool enable)
 		opt.set.max = q->parms.qth_max >> q->parms.Wlog;
 		opt.set.probability = q->parms.max_P;
 		opt.set.is_ecn = red_use_ecn(q);
+		opt.set.is_harddrop = red_use_harddrop(q);
 		opt.set.qstats = &sch->qstats;
 	} else {
 		opt.command = TC_RED_DESTROY;
-- 
2.17.1

[PATCH net-next 7/7] nfp: abm: refuse RED offload with harddrop set

[Jakub Kicinski]

RED Qdisc will now inform the drivers about the state of the harddrop
flag.  Refuse to offload in case harddrop is set.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/abm/qdisc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/abm/qdisc.c b/drivers/net/ethernet/netronome/nfp/abm/qdisc.c
index 979afb3ea855..bb05f9ee0401 100644
--- a/drivers/net/ethernet/netronome/nfp/abm/qdisc.c
+++ b/drivers/net/ethernet/netronome/nfp/abm/qdisc.c
@@ -83,6 +83,11 @@ nfp_abm_red_check_params(struct nfp_abm_link *alink,
 			 opt->parent, opt->handle);
 		return false;
 	}
+	if (opt->set.is_harddrop) {
+		nfp_warn(cpp, "RED offload failed - harddrop is not supported (p:%08x h:%08x)\n",
+			 opt->parent, opt->handle);
+		return false;
+	}
 	if (opt->set.min != opt->set.max) {
 		nfp_warn(cpp, "RED offload failed - unsupported min/max parameters (p:%08x h:%08x)\n",
 			 opt->parent, opt->handle);
-- 
2.17.1

Re: [PATCH net-next 0/7] nfp: abm: move code and improve parameter validation

[David Miller]

From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Thu,  8 Nov 2018 19:50:32 -0800

> This set starts by separating Qdisc handling code into a new file.
> Next two patches allow early access to TLV-based capabilities during
> probe, previously the capabilities were parsed just before netdevs
> were registered, but its cleaner to do some basic validation earlier
> and avoid cleanup work.
> 
> Next three patches improve RED's parameter validation.  First we provide
> a more precise message about why offload failed (and move the parameter
> validation to a helper).  Next we make sure we don't set the top bit
> in the 32 bit max RED threshold value.  Because FW is treating the value
> as signed it reportedly causes slow downs (unnecessary queuing and
> marking) when top bit is set with recent firmwares.  Last (and perhaps
> least importantly) we offload the harddrop parameter of the Qdisc.
> We don't plan to offload harddrop RED, but it seems prudent to make
> sure user didn't set that flag as device behaviour would have differed.

Series applied, thanks Jakub.