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From: Geetha sowjanya <gakula@marvell.com>
To: <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>
CC: <kuba@kernel.org>, <davem@davemloft.net>, <pabeni@redhat.com>,
        <edumazet@google.com>, <sgoutham@marvell.com>, <gakula@marvell.com>,
        <sbhatta@marvell.com>, <hkelam@marvell.com>
Subject: [net-next PATCH v2 3/9] octeontx2-pf: Create representor netdev
Date: Mon, 22 Apr 2024 15:23:55 +0530
Message-ID: <20240422095401.14245-4-gakula@marvell.com>
In-Reply-To: <20240422095401.14245-1-gakula@marvell.com>
References: <20240422095401.14245-1-gakula@marvell.com>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain

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@marvell.com>
---
 .../marvell/octeontx2/nic/otx2_devlink.c      |  47 ++++++
 .../net/ethernet/marvell/octeontx2/nic/rep.c  | 154 ++++++++++++++++++
 .../net/ethernet/marvell/octeontx2/nic/rep.h  |   2 +
 3 files changed, 203 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
index 4e1130496573..60156c7ebe45 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
@@ -76,7 +76,52 @@ static const struct devlink_param otx2_dl_params[] = {
 			     otx2_dl_mcam_count_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 (!is_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;
+
+	if (!is_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:
+		rvu_rep_create(pfvf);
+		break;
+	default:
+		return -EINVAL;
+	}
+	pfvf->esw_mode = mode;
+	return 0;
+}
+#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)
@@ -112,6 +157,7 @@ int otx2_register_dl(struct otx2_nic *pfvf)
 	devlink_free(dl);
 	return err;
 }
+EXPORT_SYMBOL(otx2_register_dl);
 
 void otx2_unregister_dl(struct otx2_nic *pfvf)
 {
@@ -123,3 +169,4 @@ void otx2_unregister_dl(struct otx2_nic *pfvf)
 				  ARRAY_SIZE(otx2_dl_params));
 	devlink_free(dl);
 }
+EXPORT_SYMBOL(otx2_unregister_dl);
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/rep.c b/drivers/net/ethernet/marvell/octeontx2/nic/rep.c
index 0e19b938d197..e2571728cb0d 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/rep.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/rep.c
@@ -28,6 +28,154 @@ 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 otx2_cq_poll *cq_poll = NULL;
+	struct otx2_qset *qset = &priv->qset;
+	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) {
+			dev_err(priv->dev,
+				"RVU REP IRQ registration failed for CQ%d\n", 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_cq_poll *cq_poll = NULL;
+	struct otx2_qset *qset = &priv->qset;
+	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;
+
+	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);
+	}
+}
+
+int rvu_rep_create(struct otx2_nic *priv)
+{
+	int rep_cnt = priv->rep_cnt;
+	struct net_device *ndev;
+	struct rep_dev *rep;
+	int rep_id, err;
+	u16 pcifunc;
+
+	priv->reps = devm_kcalloc(priv->dev, 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) {
+			dev_err(priv->dev, "PFVF representor:%d creation failed\n", 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), "r%dp%d", rep_id,
+			 rvu_get_pf(pcifunc));
+
+		eth_hw_addr_random(ndev);
+		err = register_netdev(ndev);
+		if (err) {
+			dev_err(priv->dev, "PFVF reprentator registration failed\n");
+			goto exit;
+		}
+	}
+	err = rvu_rep_napi_init(priv);
+	if (err)
+		goto exit;
+
+	return 0;
+exit:
+	while (--rep_id >= 0) {
+		rep = priv->reps[rep_id];
+		unregister_netdev(rep->netdev);
+		free_netdev(rep->netdev);
+	}
+	return err;
+}
+
 static int rvu_rep_rsrc_free(struct otx2_nic *priv)
 {
 	struct otx2_qset *qset = &priv->qset;
@@ -163,6 +311,10 @@ 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:
@@ -184,6 +336,8 @@ static void rvu_rep_remove(struct pci_dev *pdev)
 {
 	struct otx2_nic *priv = pci_get_drvdata(pdev);
 
+	otx2_unregister_dl(priv);
+	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 30cce17eb48b..be6c939e5cba 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/rep.h
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/rep.h
@@ -29,4 +29,6 @@ static inline bool is_rep_dev(struct pci_dev *pdev)
 	return pdev->device == PCI_DEVID_RVU_REP;
 }
 
+int rvu_rep_create(struct otx2_nic *priv);
+void rvu_rep_destroy(struct otx2_nic *priv);
 #endif /* REP_H */
-- 
2.25.1