Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Ajit Khaparde <ajit.khaparde@broadcom.com>
To:     ajit.khaparde@broadcom.com
Cc:     andrew.gospodarek@broadcom.com, davem@davemloft.net,
        edumazet@google.com, jgg@ziepe.ca, kuba@kernel.org,
        leon@kernel.org, linux-kernel@vger.kernel.org,
        linux-rdma@vger.kernel.org, michael.chan@broadcom.com,
        netdev@vger.kernel.org, pabeni@redhat.com,
        selvin.xavier@broadcom.com, Leon Romanovsky <leonro@nvidia.com>
Subject: [PATCH v2 4/6] bnxt_en: Use direct API instead of indirection
Date:   Tue, 25 Oct 2022 10:31:08 -0700
Message-Id: <20221025173110.33192-5-ajit.khaparde@broadcom.com>
In-Reply-To: <20221025173110.33192-1-ajit.khaparde@broadcom.com>
References: <20220724231458.93830-1-ajit.khaparde@broadcom.com>
 <20221025173110.33192-1-ajit.khaparde@broadcom.com>
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--00000000000066469a05ebdf4706
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For a single ULP user there is no need for complicating function
indirection calls. Remove all this complexity in favour of direct
function calls exported by the bnxt_en driver. This allows to
simplify the code greatly.

Suggested-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
---
 drivers/infiniband/hw/bnxt_re/main.c          | 71 +++++--------------
 drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c | 64 +++++------------
 drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h | 24 +++----
 3 files changed, 43 insertions(+), 116 deletions(-)

diff --git a/drivers/infiniband/hw/bnxt_re/main.c b/drivers/infiniband/hw/bnxt_re/main.c
index 755821c68020..67872e9bfd63 100644
--- a/drivers/infiniband/hw/bnxt_re/main.c
+++ b/drivers/infiniband/hw/bnxt_re/main.c
@@ -353,23 +353,6 @@ static struct bnxt_ulp_ops bnxt_re_ulp_ops = {
 
 /* RoCE -> Net driver */
 
-/* Driver registration routines used to let the networking driver (bnxt_en)
- * to know that the RoCE driver is now installed
- */
-static int bnxt_re_unregister_netdev(struct bnxt_re_dev *rdev)
-{
-	struct bnxt_en_dev *en_dev;
-	int rc;
-
-	if (!rdev)
-		return -EINVAL;
-
-	en_dev = rdev->en_dev;
-
-	rc = en_dev->en_ops->bnxt_unregister_device(rdev->en_dev);
-	return rc;
-}
-
 static int bnxt_re_register_netdev(struct bnxt_re_dev *rdev)
 {
 	struct bnxt_en_dev *en_dev;
@@ -380,26 +363,12 @@ static int bnxt_re_register_netdev(struct bnxt_re_dev *rdev)
 
 	en_dev = rdev->en_dev;
 
-	rc = en_dev->en_ops->bnxt_register_device(en_dev,
-						  &bnxt_re_ulp_ops, rdev);
-	rdev->qplib_res.pdev = rdev->en_dev->pdev;
+	rc = bnxt_register_dev(en_dev, &bnxt_re_ulp_ops, rdev);
+	if (!rc)
+		rdev->qplib_res.pdev = rdev->en_dev->pdev;
 	return rc;
 }
 
-static int bnxt_re_free_msix(struct bnxt_re_dev *rdev)
-{
-	struct bnxt_en_dev *en_dev;
-
-	if (!rdev)
-		return -EINVAL;
-
-	en_dev = rdev->en_dev;
-
-	en_dev->en_ops->bnxt_free_msix(rdev->en_dev);
-
-	return 0;
-}
-
 static int bnxt_re_request_msix(struct bnxt_re_dev *rdev)
 {
 	int rc = 0, num_msix_want = BNXT_RE_MAX_MSIX, num_msix_got;
@@ -412,9 +381,9 @@ static int bnxt_re_request_msix(struct bnxt_re_dev *rdev)
 
 	num_msix_want = min_t(u32, BNXT_RE_MAX_MSIX, num_online_cpus());
 
-	num_msix_got = en_dev->en_ops->bnxt_request_msix(en_dev,
-							 rdev->msix_entries,
-							 num_msix_want);
+	num_msix_got = bnxt_req_msix_vecs(en_dev,
+					  rdev->msix_entries,
+					  num_msix_want);
 	if (num_msix_got < BNXT_RE_MIN_MSIX) {
 		rc = -EINVAL;
 		goto done;
@@ -475,7 +444,7 @@ static int bnxt_re_net_ring_free(struct bnxt_re_dev *rdev,
 	req.ring_id = cpu_to_le16(fw_ring_id);
 	bnxt_re_fill_fw_msg(&fw_msg, (void *)&req, sizeof(req), (void *)&resp,
 			    sizeof(resp), DFLT_HWRM_CMD_TIMEOUT);
-	rc = en_dev->en_ops->bnxt_send_fw_msg(en_dev, &fw_msg);
+	rc = bnxt_send_msg(en_dev, &fw_msg);
 	if (rc)
 		ibdev_err(&rdev->ibdev, "Failed to free HW ring:%d :%#x",
 			  req.ring_id, rc);
@@ -512,7 +481,7 @@ static int bnxt_re_net_ring_alloc(struct bnxt_re_dev *rdev,
 	req.int_mode = ring_attr->mode;
 	bnxt_re_fill_fw_msg(&fw_msg, (void *)&req, sizeof(req), (void *)&resp,
 			    sizeof(resp), DFLT_HWRM_CMD_TIMEOUT);
-	rc = en_dev->en_ops->bnxt_send_fw_msg(en_dev, &fw_msg);
+	rc = bnxt_send_msg(en_dev, &fw_msg);
 	if (!rc)
 		*fw_ring_id = le16_to_cpu(resp.ring_id);
 
@@ -540,7 +509,7 @@ static int bnxt_re_net_stats_ctx_free(struct bnxt_re_dev *rdev,
 	req.stat_ctx_id = cpu_to_le32(fw_stats_ctx_id);
 	bnxt_re_fill_fw_msg(&fw_msg, (void *)&req, sizeof(req), (void *)&resp,
 			    sizeof(resp), DFLT_HWRM_CMD_TIMEOUT);
-	rc = en_dev->en_ops->bnxt_send_fw_msg(en_dev, &fw_msg);
+	rc = bnxt_send_msg(en_dev, &fw_msg);
 	if (rc)
 		ibdev_err(&rdev->ibdev, "Failed to free HW stats context %#x",
 			  rc);
@@ -573,7 +542,7 @@ static int bnxt_re_net_stats_ctx_alloc(struct bnxt_re_dev *rdev,
 	req.stat_ctx_flags = STAT_CTX_ALLOC_REQ_STAT_CTX_FLAGS_ROCE;
 	bnxt_re_fill_fw_msg(&fw_msg, (void *)&req, sizeof(req), (void *)&resp,
 			    sizeof(resp), DFLT_HWRM_CMD_TIMEOUT);
-	rc = en_dev->en_ops->bnxt_send_fw_msg(en_dev, &fw_msg);
+	rc = bnxt_send_msg(en_dev, &fw_msg);
 	if (!rc)
 		*fw_stats_ctx_id = le32_to_cpu(resp.stat_ctx_id);
 
@@ -1079,7 +1048,7 @@ static int bnxt_re_query_hwrm_pri2cos(struct bnxt_re_dev *rdev, u8 dir,
 
 	bnxt_re_fill_fw_msg(&fw_msg, (void *)&req, sizeof(req), (void *)&resp,
 			    sizeof(resp), DFLT_HWRM_CMD_TIMEOUT);
-	rc = en_dev->en_ops->bnxt_send_fw_msg(en_dev, &fw_msg);
+	rc = bnxt_send_msg(en_dev, &fw_msg);
 	if (rc)
 		return rc;
 
@@ -1265,7 +1234,7 @@ static void bnxt_re_query_hwrm_intf_version(struct bnxt_re_dev *rdev)
 	req.hwrm_intf_upd = HWRM_VERSION_UPDATE;
 	bnxt_re_fill_fw_msg(&fw_msg, (void *)&req, sizeof(req), (void *)&resp,
 			    sizeof(resp), DFLT_HWRM_CMD_TIMEOUT);
-	rc = en_dev->en_ops->bnxt_send_fw_msg(en_dev, &fw_msg);
+	rc = bnxt_send_msg(en_dev, &fw_msg);
 	if (rc) {
 		ibdev_err(&rdev->ibdev, "Failed to query HW version, rc = 0x%x",
 			  rc);
@@ -1328,20 +1297,12 @@ static void bnxt_re_dev_uninit(struct bnxt_re_dev *rdev)
 		bnxt_re_net_ring_free(rdev, rdev->rcfw.creq.ring_id, type);
 		bnxt_qplib_free_rcfw_channel(&rdev->rcfw);
 	}
-	if (test_and_clear_bit(BNXT_RE_FLAG_GOT_MSIX, &rdev->flags)) {
-		rc = bnxt_re_free_msix(rdev);
-		if (rc)
-			ibdev_warn(&rdev->ibdev,
-				   "Failed to free MSI-X vectors: %#x", rc);
-	}
+	if (test_and_clear_bit(BNXT_RE_FLAG_GOT_MSIX, &rdev->flags))
+		bnxt_free_msix_vecs(rdev->en_dev);
 
 	bnxt_re_destroy_chip_ctx(rdev);
-	if (test_and_clear_bit(BNXT_RE_FLAG_NETDEV_REGISTERED, &rdev->flags)) {
-		rc = bnxt_re_unregister_netdev(rdev);
-		if (rc)
-			ibdev_warn(&rdev->ibdev,
-				   "Failed to unregister with netdev: %#x", rc);
-	}
+	if (test_and_clear_bit(BNXT_RE_FLAG_NETDEV_REGISTERED, &rdev->flags))
+		bnxt_unregister_dev(rdev->en_dev);
 }
 
 /* worker thread for polling periodic events. Now used for QoS programming*/
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
index 5fa653c2458a..dbb1fa086013 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
@@ -28,9 +28,9 @@
 
 static DEFINE_IDA(bnxt_aux_dev_ids);
 
-static int bnxt_register_dev(struct bnxt_en_dev *edev,
-			     struct bnxt_ulp_ops *ulp_ops,
-			     void *handle)
+int bnxt_register_dev(struct bnxt_en_dev *edev,
+		      struct bnxt_ulp_ops *ulp_ops,
+		      void *handle)
 {
 	struct net_device *dev = edev->net;
 	struct bnxt *bp = netdev_priv(dev);
@@ -55,8 +55,9 @@ static int bnxt_register_dev(struct bnxt_en_dev *edev,
 
 	return 0;
 }
+EXPORT_SYMBOL(bnxt_register_dev);
 
-static int bnxt_unregister_dev(struct bnxt_en_dev *edev)
+void bnxt_unregister_dev(struct bnxt_en_dev *edev)
 {
 	struct net_device *dev = edev->net;
 	struct bnxt *bp = netdev_priv(dev);
@@ -65,7 +66,7 @@ static int bnxt_unregister_dev(struct bnxt_en_dev *edev)
 
 	ulp = edev->ulp_tbl;
 	if (ulp->msix_requested)
-		edev->en_ops->bnxt_free_msix(edev);
+		bnxt_free_msix_vecs(edev);
 
 	if (ulp->max_async_event_id)
 		bnxt_hwrm_func_drv_rgtr(bp, NULL, 0, true);
@@ -78,8 +79,9 @@ static int bnxt_unregister_dev(struct bnxt_en_dev *edev)
 	}
 	kfree(ulp);
 	edev->ulp_tbl = NULL;
-	return 0;
+	return;
 }
+EXPORT_SYMBOL(bnxt_unregister_dev);
 
 static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent)
 {
@@ -101,7 +103,7 @@ static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent)
 	}
 }
 
-static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev,
+int bnxt_req_msix_vecs(struct bnxt_en_dev *edev,
 			      struct bnxt_msix_entry *ent,
 			      int num_msix)
 {
@@ -164,8 +166,9 @@ static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev,
 	edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED;
 	return avail_msix;
 }
+EXPORT_SYMBOL(bnxt_req_msix_vecs);
 
-static void bnxt_free_msix_vecs(struct bnxt_en_dev *edev)
+void bnxt_free_msix_vecs(struct bnxt_en_dev *edev)
 {
 	struct net_device *dev = edev->net;
 	struct bnxt *bp = netdev_priv(dev);
@@ -184,6 +187,7 @@ static void bnxt_free_msix_vecs(struct bnxt_en_dev *edev)
 
 	return;
 }
+EXPORT_SYMBOL(bnxt_free_msix_vecs);
 
 int bnxt_get_ulp_msix_num(struct bnxt *bp)
 {
@@ -218,7 +222,7 @@ int bnxt_get_ulp_stat_ctxs(struct bnxt *bp)
 	return 0;
 }
 
-static int bnxt_send_msg(struct bnxt_en_dev *edev,
+int bnxt_send_msg(struct bnxt_en_dev *edev,
 			 struct bnxt_fw_msg *fw_msg)
 {
 	struct net_device *dev = edev->net;
@@ -252,6 +256,7 @@ static int bnxt_send_msg(struct bnxt_en_dev *edev,
 	hwrm_req_drop(bp, req);
 	return rc;
 }
+EXPORT_SYMBOL(bnxt_send_msg);
 
 static void bnxt_ulp_get(struct bnxt_ulp *ulp)
 {
@@ -310,14 +315,11 @@ void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs)
 	if (!edev)
 		return;
 
-	rcu_read_lock();
-	ops = rcu_dereference(ulp->ulp_ops);
-	if (!ops || !ops->ulp_sriov_config) {
-		rcu_read_unlock();
+	ops = rtnl_dereference(ulp->ulp_ops);
+	if (!ops || !ops->ulp_sriov_config)
 		return;
-	}
+
 	bnxt_ulp_get(ulp);
-	rcu_read_unlock();
 	ops->ulp_sriov_config(ulp->handle, num_vfs);
 	bnxt_ulp_put(ulp);
 }
@@ -384,10 +386,9 @@ void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl)
 	if (!edev)
 		return;
 
-	rcu_read_lock();
 	ulp = edev->ulp_tbl;
 
-	ops = rcu_dereference(ulp->ulp_ops);
+	ops = rtnl_dereference(ulp->ulp_ops);
 	if (!ops || !ops->ulp_async_notifier)
 		return;
 	if (!ulp->async_events_bmap || event_id > ulp->max_async_event_id)
@@ -397,35 +398,8 @@ void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl)
 	smp_rmb();
 	if (test_bit(event_id, ulp->async_events_bmap))
 		ops->ulp_async_notifier(ulp->handle, cmpl);
-	rcu_read_unlock();
-}
-
-static int bnxt_register_async_events(struct bnxt_en_dev *edev,
-				      unsigned long *events_bmap,
-				      u16 max_id)
-{
-	struct net_device *dev = edev->net;
-	struct bnxt *bp = netdev_priv(dev);
-	struct bnxt_ulp *ulp;
-
-	ulp = edev->ulp_tbl;
-	ulp->async_events_bmap = events_bmap;
-	/* Make sure bnxt_ulp_async_events() sees this order */
-	smp_wmb();
-	ulp->max_async_event_id = max_id;
-	bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true);
-	return 0;
 }
 
-static const struct bnxt_en_ops bnxt_en_ops_tbl = {
-	.bnxt_register_device	= bnxt_register_dev,
-	.bnxt_unregister_device	= bnxt_unregister_dev,
-	.bnxt_request_msix	= bnxt_req_msix_vecs,
-	.bnxt_free_msix		= bnxt_free_msix_vecs,
-	.bnxt_send_fw_msg	= bnxt_send_msg,
-	.bnxt_register_fw_async_events	= bnxt_register_async_events,
-};
-
 void bnxt_aux_dev_free(struct bnxt *bp)
 {
 	kfree(bp->aux_dev);
@@ -494,7 +468,6 @@ void bnxt_aux_dev_release(struct device *dev)
 		container_of(dev, struct bnxt_aux_dev, aux_dev.dev);
 	struct bnxt *bp = netdev_priv(bnxt_adev->edev->net);
 
-	bnxt_adev->edev->en_ops = NULL;
 	kfree(bnxt_adev->edev);
 	bnxt_adev->edev = NULL;
 	bp->edev = NULL;
@@ -502,7 +475,6 @@ void bnxt_aux_dev_release(struct device *dev)
 
 static inline void bnxt_set_edev_info(struct bnxt_en_dev *edev, struct bnxt *bp)
 {
-	edev->en_ops = &bnxt_en_ops_tbl;
 	edev->net = bp->dev;
 	edev->pdev = bp->pdev;
 	edev->l2_db_size = bp->db_size;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
index 357f8fde5d61..42e324635e6b 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
@@ -47,7 +47,7 @@ struct bnxt_fw_msg {
 
 struct bnxt_ulp {
 	void		*handle;
-	struct bnxt_ulp_ops __rcu *ulp_ops;
+	struct bnxt_ulp_ops *ulp_ops;
 	unsigned long	*async_events_bmap;
 	u16		max_async_event_id;
 	u16		msix_requested;
@@ -65,7 +65,6 @@ struct bnxt_en_dev {
 						 BNXT_EN_FLAG_ROCEV2_CAP)
 	#define BNXT_EN_FLAG_MSIX_REQUESTED	0x4
 	#define BNXT_EN_FLAG_ULP_STOPPED	0x8
-	const struct bnxt_en_ops	*en_ops;
 	struct bnxt_ulp			*ulp_tbl;
 	int				l2_db_size;	/* Doorbell BAR size in
 							 * bytes mapped by L2
@@ -77,19 +76,6 @@ struct bnxt_en_dev {
 							 */
 };
 
-struct bnxt_en_ops {
-	int (*bnxt_register_device)(struct bnxt_en_dev *edev,
-				    struct bnxt_ulp_ops *ulp_ops, void *handle);
-	int (*bnxt_unregister_device)(struct bnxt_en_dev *edev);
-	int (*bnxt_request_msix)(struct bnxt_en_dev *edev,
-				 struct bnxt_msix_entry *ent, int num_msix);
-	void (*bnxt_free_msix)(struct bnxt_en_dev *edev);
-	int (*bnxt_send_fw_msg)(struct bnxt_en_dev *edev,
-				struct bnxt_fw_msg *fw_msg);
-	int (*bnxt_register_fw_async_events)(struct bnxt_en_dev *edev,
-					     unsigned long *events_bmap, u16 max_id);
-};
-
 static inline bool bnxt_ulp_registered(struct bnxt_en_dev *edev)
 {
 	if (edev && edev->ulp_tbl)
@@ -112,4 +98,12 @@ int bnxt_rdma_aux_device_add(struct bnxt *bp);
 void bnxt_rdma_aux_device_uninit(struct bnxt_aux_dev *bnxt_adev);
 void bnxt_rdma_aux_device_init(struct bnxt *bp);
 void bnxt_aux_dev_free(struct bnxt *bp);
+
+int bnxt_register_dev(struct bnxt_en_dev *edev, struct bnxt_ulp_ops *ulp_ops,
+		      void *handle);
+void bnxt_unregister_dev(struct bnxt_en_dev *edev);
+int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, struct bnxt_msix_entry *ent,
+		       int num_msix);
+void bnxt_free_msix_vecs(struct bnxt_en_dev *edev);
+int bnxt_send_msg(struct bnxt_en_dev *edev, struct bnxt_fw_msg *fw_msg);
 #endif
-- 
2.37.0 (Apple Git-136)


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