netdev - [PATCH net-next 07/10] qed*: Add iWARP 100g support

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Date:   Wed, 1 May 2019 12:57:19 +0300
From:   Michal Kalderon <michal.kalderon@...vell.com>
To:     <michal.kalderon@...vell.com>, <ariel.elior@...vell.com>,
        <davem@...emloft.net>
CC:     <jgg@...pe.ca>, <dledford@...hat.com>,
        <linux-rdma@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-scsi@...r.kernel.org>
Subject: [PATCH net-next 07/10] qed*: Add iWARP 100g support

Add iWARP engine affinity setting for supporting iWARP over 100g.
iWARP cannot be distinguished by the LLH from L2, hence the
engine division will affect L2 as well. For this reason we add
a module parameter in qedr that enables the engine division.

Signed-off-by: Ariel Elior <ariel.elior@...vell.com>
Signed-off-by: Michal Kalderon <michal.kalderon@...vell.com>
---
 drivers/infiniband/hw/qedr/main.c          | 22 ++++++++++++++++++++++
 drivers/net/ethernet/qlogic/qed/qed_rdma.c | 27 +++++++++++++++++++++++++++
 include/linux/qed/qed_rdma_if.h            |  2 ++
 3 files changed, 51 insertions(+)

diff --git a/drivers/infiniband/hw/qedr/main.c b/drivers/infiniband/hw/qedr/main.c
index d93c8a893a89..8bc6775abb79 100644
--- a/drivers/infiniband/hw/qedr/main.c
+++ b/drivers/infiniband/hw/qedr/main.c
@@ -52,6 +52,10 @@ MODULE_DESCRIPTION("QLogic 40G/100G ROCE Driver");
 MODULE_AUTHOR("QLogic Corporation");
 MODULE_LICENSE("Dual BSD/GPL");
 
+static uint iwarp_cmt;
+module_param(iwarp_cmt, uint, 0444);
+MODULE_PARM_DESC(iwarp_cmt, " iWARP: Support CMT mode. 0 - Disabled, 1 - Enabled. Default: Disabled");
+
 #define QEDR_WQ_MULTIPLIER_DFT	(3)
 
 static void qedr_ib_dispatch_event(struct qedr_dev *dev, u8 port_num,
@@ -886,7 +890,21 @@ static struct qedr_dev *qedr_add(struct qed_dev *cdev, struct pci_dev *pdev,
 	dev->user_dpm_enabled = dev_info.user_dpm_enabled;
 	dev->rdma_type = dev_info.rdma_type;
 	dev->num_hwfns = dev_info.common.num_hwfns;
+
+	if (IS_IWARP(dev) && QEDR_IS_CMT(dev)) {
+		if (!iwarp_cmt) {
+			DP_ERR(dev,
+			       "By default, iWARP is not supported over a 100G device. Can use the \"iwarp_cmt\" module parameter to enable it.\n");
+			rc = -EINVAL;
+			goto init_err;
+		}
+
+		rc = dev->ops->iwarp_set_engine_affin(cdev, false /* !reset */);
+		if (rc)
+			goto init_err;
+	}
 	dev->affin_hwfn_idx = dev->ops->common->get_affin_hwfn_idx(cdev);
+
 	dev->rdma_ctx = dev->ops->rdma_get_rdma_ctx(cdev);
 
 	dev->num_cnq = dev->ops->rdma_get_min_cnq_msix(cdev);
@@ -947,6 +965,10 @@ static void qedr_remove(struct qedr_dev *dev)
 	qedr_stop_hw(dev);
 	qedr_sync_free_irqs(dev);
 	qedr_free_resources(dev);
+
+	if (IS_IWARP(dev) && QEDR_IS_CMT(dev) && iwarp_cmt)
+		dev->ops->iwarp_set_engine_affin(dev->cdev, true /* reset */);
+
 	ib_dealloc_device(&dev->ibdev);
 }
 
diff --git a/drivers/net/ethernet/qlogic/qed/qed_rdma.c b/drivers/net/ethernet/qlogic/qed/qed_rdma.c
index e4d63359864e..1bcbb4ceeb2e 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_rdma.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_rdma.c
@@ -1916,6 +1916,32 @@ static int qed_roce_ll2_set_mac_filter(struct qed_dev *cdev,
 	return rc;
 }
 
+static int qed_iwarp_set_engine_affin(struct qed_dev *cdev, bool b_reset)
+{
+	enum qed_eng eng;
+	u8 ppfid = 0;
+	int rc;
+
+	if (b_reset)
+		eng = QED_BOTH_ENG;
+	else
+		eng = cdev->l2_affin_hint ? QED_ENG1 : QED_ENG0;
+
+	rc = qed_llh_set_ppfid_affinity(cdev, ppfid, eng);
+	if (rc) {
+		DP_NOTICE(cdev,
+			  "Failed to set the engine affinity of ppfid %d\n",
+			  ppfid);
+		return rc;
+	}
+
+	DP_VERBOSE(cdev, (QED_MSG_RDMA | QED_MSG_SP),
+		   "LLH: Set the engine affinity of non-RoCE packets as %d\n",
+		   eng);
+
+	return 0;
+}
+
 static const struct qed_rdma_ops qed_rdma_ops_pass = {
 	.common = &qed_common_ops_pass,
 	.fill_dev_info = &qed_fill_rdma_dev_info,
@@ -1955,6 +1981,7 @@ static const struct qed_rdma_ops qed_rdma_ops_pass = {
 	.ll2_set_fragment_of_tx_packet = &qed_ll2_set_fragment_of_tx_packet,
 	.ll2_set_mac_filter = &qed_roce_ll2_set_mac_filter,
 	.ll2_get_stats = &qed_ll2_get_stats,
+	.iwarp_set_engine_affin = &qed_iwarp_set_engine_affin,
 	.iwarp_connect = &qed_iwarp_connect,
 	.iwarp_create_listen = &qed_iwarp_create_listen,
 	.iwarp_destroy_listen = &qed_iwarp_destroy_listen,
diff --git a/include/linux/qed/qed_rdma_if.h b/include/linux/qed/qed_rdma_if.h
index d15f8e4815e3..898f595ea3d6 100644
--- a/include/linux/qed/qed_rdma_if.h
+++ b/include/linux/qed/qed_rdma_if.h
@@ -670,6 +670,8 @@ struct qed_rdma_ops {
 	int (*ll2_set_mac_filter)(struct qed_dev *cdev,
 				  u8 *old_mac_address, u8 *new_mac_address);
 
+	int (*iwarp_set_engine_affin)(struct qed_dev *cdev, bool b_reset);
+
 	int (*iwarp_connect)(void *rdma_cxt,
 			     struct qed_iwarp_connect_in *iparams,
 			     struct qed_iwarp_connect_out *oparams);
-- 
2.14.5