Message-ID: <20240822132031.29494-4-gakula@marvell.com>
Date: Thu, 22 Aug 2024 18:50:23 +0530
From: Geetha sowjanya <gakula@...vell.com>
To: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <kuba@...nel.org>, <davem@...emloft.net>, <pabeni@...hat.com>,
        <jiri@...nulli.us>, <edumazet@...gle.com>, <sgoutham@...vell.com>,
        <gakula@...vell.com>, <sbhatta@...vell.com>, <hkelam@...vell.com>
Subject: [net-next PATCH v11 03/11] octeontx2-pf: Create representor netdev

Adds initial devlink support to set/get the switchdev mode.
Representor netdevs are created for each rvu devices when
the switch mode is set to 'switchdev'. These netdevs are
be used to control and configure VFs.

Signed-off-by: Geetha sowjanya <gakula@...vell.com>
Reviewed-by: Simon Horman <horms@...nel.org>
---
 .../ethernet/marvell/octeontx2.rst            |  53 ++++++
 .../marvell/octeontx2/nic/otx2_devlink.c      |  49 ++++++
 .../net/ethernet/marvell/octeontx2/nic/rep.c  | 165 ++++++++++++++++++
 .../net/ethernet/marvell/octeontx2/nic/rep.h  |   3 +
 4 files changed, 270 insertions(+)

diff --git a/Documentation/networking/device_drivers/ethernet/marvell/octeontx2.rst b/Documentation/networking/device_drivers/ethernet/marvell/octeontx2.rst
index 1e196cb9ce25..1132ae2d007c 100644
--- a/Documentation/networking/device_drivers/ethernet/marvell/octeontx2.rst
+++ b/Documentation/networking/device_drivers/ethernet/marvell/octeontx2.rst
@@ -14,6 +14,7 @@ Contents
 - `Basic packet flow`_
 - `Devlink health reporters`_
 - `Quality of service`_
+- `RVU representors`_
 
 Overview
 ========
@@ -340,3 +341,55 @@ Setup HTB offload
         # tc class add dev <interface> parent 1: classid 1:2 htb rate 10Gbit prio 2 quantum 188416
 
         # tc class add dev <interface> parent 1: classid 1:3 htb rate 10Gbit prio 2 quantum 32768
+
+
+RVU Representors
+================
+
+RVU representor driver adds support for creation of representor devices for
+RVU PFs' VFs in the system. Representor devices are created when user enables
+the switchdev mode.
+Switchdev mode can be enabled either before or after setting up SRIOV numVFs.
+All representor devices share a single NIXLF but each has a dedicated queue
+(ie RQ/SQ. RVU PF representor driver registers a separate netdev for each
+RQ/SQ queue pair.
+
+HW doesn't have a in-built switch which can do L2 learning and forward pkts
+between representee and representor. Hence packet path between representee
+and it's representor is achieved by setting up appropriate NPC MCAM filters.
+Transmit packets matching these filters will be loopbacked through hardware
+loopback channel/interface (i.e, instead of sending them out of MAC interface).
+Which will again match the installed filters and will be forwarded.
+This way representee => representor and representor => representee packet
+path is achieved. These rules get installed when representors are created
+and gets active/deactivate based on the representor/representee interface state.
+
+Usage example:
+
+ - List of devices on the system before vfs are created::
+
+	# devlink dev
+	pci/0002:1c:00.0
+
+ - Change device to switchdev mode::
+
+	# devlink dev eswitch set pci/0002:1c:00.0 mode switchdev
+
+ - List of representor devices on the system::
+
+	# ip link show
+
+Sample output::
+
+	# ip link show
+	pf1vf0rep: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 7e:5a:66:ea:fe:d6 brd ff:ff:ff:ff:ff:ff
+	pf1vf1rep: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether de:29:be:10:9e:bf brd ff:ff:ff:ff:ff:ff
+	pf1vf2rep: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 4a:12:c7:a2:66:ad brd ff:ff:ff:ff:ff:ff
+	pf1vf3rep: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether c2:b8:a8:0e:73:fd brd ff:ff:ff:ff:ff:ff
+
+
+To remove the representors devices from the system. Change the device to legacy mode.
+
+ - Change device to legacy mode::
+
+	# devlink dev eswitch set pci/0002:1c:00.0 mode legacy
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
index 53f14aa944bd..33ec9a7f7c03 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
@@ -141,7 +141,56 @@ static const struct devlink_param otx2_dl_params[] = {
 			     otx2_dl_ucast_flt_cnt_validate),
 };
 
+#ifdef CONFIG_RVU_ESWITCH
+static int otx2_devlink_eswitch_mode_get(struct devlink *devlink, u16 *mode)
+{
+	struct otx2_devlink *otx2_dl = devlink_priv(devlink);
+	struct otx2_nic *pfvf = otx2_dl->pfvf;
+
+	if (!otx2_rep_dev(pfvf->pdev))
+		return -EOPNOTSUPP;
+
+	*mode = pfvf->esw_mode;
+
+	return 0;
+}
+
+static int otx2_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
+					 struct netlink_ext_ack *extack)
+{
+	struct otx2_devlink *otx2_dl = devlink_priv(devlink);
+	struct otx2_nic *pfvf = otx2_dl->pfvf;
+	int ret = 0;
+
+	if (!otx2_rep_dev(pfvf->pdev))
+		return -EOPNOTSUPP;
+
+	if (pfvf->esw_mode == mode)
+		return 0;
+
+	switch (mode) {
+	case DEVLINK_ESWITCH_MODE_LEGACY:
+		rvu_rep_destroy(pfvf);
+		break;
+	case DEVLINK_ESWITCH_MODE_SWITCHDEV:
+		ret = rvu_rep_create(pfvf, extack);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (!ret)
+		pfvf->esw_mode = mode;
+
+	return ret;
+}
+#endif
+
 static const struct devlink_ops otx2_devlink_ops = {
+#ifdef CONFIG_RVU_ESWITCH
+	.eswitch_mode_get = otx2_devlink_eswitch_mode_get,
+	.eswitch_mode_set = otx2_devlink_eswitch_mode_set,
+#endif
 };
 
 int otx2_register_dl(struct otx2_nic *pfvf)
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/rep.c b/drivers/net/ethernet/marvell/octeontx2/nic/rep.c
index 6d66d0192ac8..5635861a83f7 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/rep.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/rep.c
@@ -28,6 +28,164 @@ MODULE_DESCRIPTION(DRV_STRING);
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, rvu_rep_id_table);
 
+static int rvu_rep_napi_init(struct otx2_nic *priv,
+			     struct netlink_ext_ack *extack)
+{
+	struct otx2_qset *qset = &priv->qset;
+	struct otx2_cq_poll *cq_poll = NULL;
+	struct otx2_hw *hw = &priv->hw;
+	int err = 0, qidx, vec;
+	char *irq_name;
+
+	qset->napi = kcalloc(hw->cint_cnt, sizeof(*cq_poll), GFP_KERNEL);
+	if (!qset->napi)
+		return -ENOMEM;
+
+	/* Register NAPI handler */
+	for (qidx = 0; qidx < hw->cint_cnt; qidx++) {
+		cq_poll = &qset->napi[qidx];
+		cq_poll->cint_idx = qidx;
+		cq_poll->cq_ids[CQ_RX] =
+			(qidx <  hw->rx_queues) ? qidx : CINT_INVALID_CQ;
+		cq_poll->cq_ids[CQ_TX] = (qidx < hw->tx_queues) ?
+					  qidx + hw->rx_queues :
+					  CINT_INVALID_CQ;
+		cq_poll->cq_ids[CQ_XDP] = CINT_INVALID_CQ;
+		cq_poll->cq_ids[CQ_QOS] = CINT_INVALID_CQ;
+
+		cq_poll->dev = (void *)priv;
+		netif_napi_add(priv->reps[qidx]->netdev, &cq_poll->napi,
+			       otx2_napi_handler);
+		napi_enable(&cq_poll->napi);
+	}
+	/* Register CQ IRQ handlers */
+	vec = hw->nix_msixoff + NIX_LF_CINT_VEC_START;
+	for (qidx = 0; qidx < hw->cint_cnt; qidx++) {
+		irq_name = &hw->irq_name[vec * NAME_SIZE];
+
+		snprintf(irq_name, NAME_SIZE, "rep%d-rxtx-%d", qidx, qidx);
+
+		err = request_irq(pci_irq_vector(priv->pdev, vec),
+				  otx2_cq_intr_handler, 0, irq_name,
+				  &qset->napi[qidx]);
+		if (err) {
+			NL_SET_ERR_MSG_FMT_MOD(extack,
+					       "RVU REP IRQ registration failed for CQ%d",
+					       qidx);
+			goto err_free_cints;
+		}
+		vec++;
+
+		/* Enable CQ IRQ */
+		otx2_write64(priv, NIX_LF_CINTX_INT(qidx), BIT_ULL(0));
+		otx2_write64(priv, NIX_LF_CINTX_ENA_W1S(qidx), BIT_ULL(0));
+	}
+	priv->flags &= ~OTX2_FLAG_INTF_DOWN;
+	return 0;
+
+err_free_cints:
+	otx2_free_cints(priv, qidx);
+	otx2_disable_napi(priv);
+	return err;
+}
+
+static void rvu_rep_free_cq_rsrc(struct otx2_nic *priv)
+{
+	struct otx2_qset *qset = &priv->qset;
+	struct otx2_cq_poll *cq_poll = NULL;
+	int qidx, vec;
+
+	/* Cleanup CQ NAPI and IRQ */
+	vec = priv->hw.nix_msixoff + NIX_LF_CINT_VEC_START;
+	for (qidx = 0; qidx < priv->hw.cint_cnt; qidx++) {
+		/* Disable interrupt */
+		otx2_write64(priv, NIX_LF_CINTX_ENA_W1C(qidx), BIT_ULL(0));
+
+		synchronize_irq(pci_irq_vector(priv->pdev, vec));
+
+		cq_poll = &qset->napi[qidx];
+		napi_synchronize(&cq_poll->napi);
+		vec++;
+	}
+	otx2_free_cints(priv, priv->hw.cint_cnt);
+	otx2_disable_napi(priv);
+}
+
+void rvu_rep_destroy(struct otx2_nic *priv)
+{
+	struct rep_dev *rep;
+	int rep_id;
+
+	priv->flags |= OTX2_FLAG_INTF_DOWN;
+	rvu_rep_free_cq_rsrc(priv);
+	for (rep_id = 0; rep_id < priv->rep_cnt; rep_id++) {
+		rep = priv->reps[rep_id];
+		unregister_netdev(rep->netdev);
+		free_netdev(rep->netdev);
+	}
+	kfree(priv->reps);
+}
+
+int rvu_rep_create(struct otx2_nic *priv, struct netlink_ext_ack *extack)
+{
+	int rep_cnt = priv->rep_cnt;
+	struct net_device *ndev;
+	struct rep_dev *rep;
+	int rep_id, err;
+	u16 pcifunc;
+
+	priv->reps = kcalloc(rep_cnt, sizeof(struct rep_dev *), GFP_KERNEL);
+	if (!priv->reps)
+		return -ENOMEM;
+
+	for (rep_id = 0; rep_id < rep_cnt; rep_id++) {
+		ndev = alloc_etherdev(sizeof(*rep));
+		if (!ndev) {
+			NL_SET_ERR_MSG_FMT_MOD(extack,
+					       "PFVF representor:%d creation failed",
+					       rep_id);
+			err = -ENOMEM;
+			goto exit;
+		}
+
+		rep = netdev_priv(ndev);
+		priv->reps[rep_id] = rep;
+		rep->mdev = priv;
+		rep->netdev = ndev;
+		rep->rep_id = rep_id;
+
+		ndev->min_mtu = OTX2_MIN_MTU;
+		ndev->max_mtu = priv->hw.max_mtu;
+		pcifunc = priv->rep_pf_map[rep_id];
+		rep->pcifunc = pcifunc;
+
+		snprintf(ndev->name, sizeof(ndev->name), "p%dv%drep",
+			 rvu_get_pf(pcifunc), (pcifunc & RVU_PFVF_FUNC_MASK));
+
+		eth_hw_addr_random(ndev);
+		err = register_netdev(ndev);
+		if (err) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "PFVF reprentator registration failed");
+			free_netdev(ndev);
+			goto exit;
+		}
+	}
+	err = rvu_rep_napi_init(priv, extack);
+	if (err)
+		goto exit;
+
+	return 0;
+exit:
+	while (--rep_id >= 0) {
+		rep = priv->reps[rep_id];
+		unregister_netdev(rep->netdev);
+		free_netdev(rep->netdev);
+	}
+	kfree(priv->reps);
+	return err;
+}
+
 static void rvu_rep_rsrc_free(struct otx2_nic *priv)
 {
 	struct otx2_qset *qset = &priv->qset;
@@ -169,6 +327,10 @@ static int rvu_rep_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (err)
 		goto err_detach_rsrc;
 
+	err = otx2_register_dl(priv);
+	if (err)
+		goto err_detach_rsrc;
+
 	return 0;
 
 err_detach_rsrc:
@@ -190,6 +352,9 @@ static void rvu_rep_remove(struct pci_dev *pdev)
 {
 	struct otx2_nic *priv = pci_get_drvdata(pdev);
 
+	otx2_unregister_dl(priv);
+	if (!(priv->flags & OTX2_FLAG_INTF_DOWN))
+		rvu_rep_destroy(priv);
 	rvu_rep_rsrc_free(priv);
 	otx2_detach_resources(&priv->mbox);
 	if (priv->hw.lmt_info)
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/rep.h b/drivers/net/ethernet/marvell/octeontx2/nic/rep.h
index 565e75628df2..c04874c4d4c6 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/rep.h
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/rep.h
@@ -28,4 +28,7 @@ static inline bool otx2_rep_dev(struct pci_dev *pdev)
 {
 	return pdev->device == PCI_DEVID_RVU_REP;
 }
+
+int rvu_rep_create(struct otx2_nic *priv, struct netlink_ext_ack *extack);
+void rvu_rep_destroy(struct otx2_nic *priv);
 #endif /* REP_H */
-- 
2.25.1

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