netdev - [PATCH net-next v2 1/5] bnxt: use the devlink instance lock to protect sriov

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Message-Id: <20220318192344.1587891-2-kuba@kernel.org>
Date:   Fri, 18 Mar 2022 12:23:40 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, jiri@...nulli.us, leonro@...dia.com,
        saeedm@...dia.com, idosch@...sch.org, michael.chan@...adcom.com,
        simon.horman@...igine.com, Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next v2 1/5] bnxt: use the devlink instance lock to protect sriov

In prep for .eswitch_mode_set being called with the devlink instance
lock held use that lock explicitly instead of creating a local mutex
just for the sriov reconfig.

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c       | 1 -
 drivers/net/ethernet/broadcom/bnxt/bnxt.h       | 6 ------
 drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c | 4 ++--
 drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c   | 4 ++--
 4 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 92a1a43b3bee..1c28495875cf 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -13470,7 +13470,6 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 #ifdef CONFIG_BNXT_SRIOV
 	init_waitqueue_head(&bp->sriov_cfg_wait);
-	mutex_init(&bp->sriov_lock);
 #endif
 	if (BNXT_SUPPORTS_TPA(bp)) {
 		bp->gro_func = bnxt_gro_func_5730x;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 447a9406b8a2..61aa3e8c5952 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -2072,12 +2072,6 @@ struct bnxt {
 	wait_queue_head_t	sriov_cfg_wait;
 	bool			sriov_cfg;
 #define BNXT_SRIOV_CFG_WAIT_TMO	msecs_to_jiffies(10000)
-
-	/* lock to protect VF-rep creation/cleanup via
-	 * multiple paths such as ->sriov_configure() and
-	 * devlink ->eswitch_mode_set()
-	 */
-	struct mutex		sriov_lock;
 #endif
 
 #if BITS_PER_LONG == 32
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
index 1d177fed44a6..ddf2f3963abe 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
@@ -846,7 +846,7 @@ void bnxt_sriov_disable(struct bnxt *bp)
 		return;
 
 	/* synchronize VF and VF-rep create and destroy */
-	mutex_lock(&bp->sriov_lock);
+	devl_lock(bp->dl);
 	bnxt_vf_reps_destroy(bp);
 
 	if (pci_vfs_assigned(bp->pdev)) {
@@ -859,7 +859,7 @@ void bnxt_sriov_disable(struct bnxt *bp)
 		/* Free the HW resources reserved for various VF's */
 		bnxt_hwrm_func_vf_resource_free(bp, num_vfs);
 	}
-	mutex_unlock(&bp->sriov_lock);
+	devl_unlock(bp->dl);
 
 	bnxt_free_vf_resources(bp);
 
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c
index 8eb28e088582..b2a9528b456b 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c
@@ -561,7 +561,7 @@ int bnxt_dl_eswitch_mode_set(struct devlink *devlink, u16 mode,
 	struct bnxt *bp = bnxt_get_bp_from_dl(devlink);
 	int rc = 0;
 
-	mutex_lock(&bp->sriov_lock);
+	devl_lock(devlink);
 	if (bp->eswitch_mode == mode) {
 		netdev_info(bp->dev, "already in %s eswitch mode\n",
 			    mode == DEVLINK_ESWITCH_MODE_LEGACY ?
@@ -595,7 +595,7 @@ int bnxt_dl_eswitch_mode_set(struct devlink *devlink, u16 mode,
 		goto done;
 	}
 done:
-	mutex_unlock(&bp->sriov_lock);
+	devl_unlock(devlink);
 	return rc;
 }
 
-- 
2.34.1