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Date: Tue, 12 Dec 2023 14:45:58 +0530
From: Suman Ghosh <sumang@...vell.com>
To: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
<pabeni@...hat.com>, <sgoutham@...vell.com>, <sbhatta@...vell.com>,
<jerinj@...vell.com>, <gakula@...vell.com>, <hkelam@...vell.com>,
<lcherian@...vell.com>, <netdev@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: Suman Ghosh <sumang@...vell.com>
Subject: [net-next PATCH] octeontx2-af: Fix multicast/mirror group lock/unlock issue
As per the existing implementation, there exists a race between finding
a multicast/mirror group entry and deleting that entry. The group lock
was taken and released independently by rvu_nix_mcast_find_grp_elem()
function. Which is incorrect and group lock should be taken during the
entire operation of group updation/deletion. This patch fixes the same.
Fixes: 51b2804c19cd ("octeontx2-af: Add new mbox to support multicast/mirror offload")
Signed-off-by: Suman Ghosh <sumang@...vell.com>
---
Note: This is a follow up of
https://urldefense.proofpoint.com/v2/url?u=https-3A__git.kernel.org_netdev_net-2Dnext_c_51b2804c19cd&d=DwIDaQ&c=nKjWec2b6R0mOyPaz7xtfQ&r=7si3Xn9Ly-Se1a655kvEPIYU0nQ9HPeN280sEUv5ROU&m=NjKPoTkYVlL5Dh4aSr3-dVo-AukiIperlvB0S4_Mqzkyl_VcYAAKrWhkGZE5Cx-p&s=AkBf0454Xm-0adqV0Os7ZE8peaCXtYyuNbCS5kit6Jk&e=
.../ethernet/marvell/octeontx2/af/rvu_nix.c | 58 +++++++++++++------
1 file changed, 40 insertions(+), 18 deletions(-)
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
index b01503acd520..0ab5626380c5 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
@@ -6142,14 +6142,12 @@ static struct nix_mcast_grp_elem *rvu_nix_mcast_find_grp_elem(struct nix_mcast_g
struct nix_mcast_grp_elem *iter;
bool is_found = false;
- mutex_lock(&mcast_grp->mcast_grp_lock);
list_for_each_entry(iter, &mcast_grp->mcast_grp_head, list) {
if (iter->mcast_grp_idx == mcast_grp_idx) {
is_found = true;
break;
}
}
- mutex_unlock(&mcast_grp->mcast_grp_lock);
if (is_found)
return iter;
@@ -6162,7 +6160,7 @@ int rvu_nix_mcast_get_mce_index(struct rvu *rvu, u16 pcifunc, u32 mcast_grp_idx)
struct nix_mcast_grp_elem *elem;
struct nix_mcast_grp *mcast_grp;
struct nix_hw *nix_hw;
- int blkaddr;
+ int blkaddr, ret;
blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NIX, pcifunc);
nix_hw = get_nix_hw(rvu->hw, blkaddr);
@@ -6170,11 +6168,15 @@ int rvu_nix_mcast_get_mce_index(struct rvu *rvu, u16 pcifunc, u32 mcast_grp_idx)
return NIX_AF_ERR_INVALID_NIXBLK;
mcast_grp = &nix_hw->mcast_grp;
+ mutex_lock(&mcast_grp->mcast_grp_lock);
elem = rvu_nix_mcast_find_grp_elem(mcast_grp, mcast_grp_idx);
if (!elem)
- return NIX_AF_ERR_INVALID_MCAST_GRP;
+ ret = NIX_AF_ERR_INVALID_MCAST_GRP;
+ else
+ ret = elem->mce_start_index;
- return elem->mce_start_index;
+ mutex_unlock(&mcast_grp->mcast_grp_lock);
+ return ret;
}
void rvu_nix_mcast_flr_free_entries(struct rvu *rvu, u16 pcifunc)
@@ -6238,7 +6240,7 @@ int rvu_nix_mcast_update_mcam_entry(struct rvu *rvu, u16 pcifunc,
struct nix_mcast_grp_elem *elem;
struct nix_mcast_grp *mcast_grp;
struct nix_hw *nix_hw;
- int blkaddr;
+ int blkaddr, ret = 0;
blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NIX, pcifunc);
nix_hw = get_nix_hw(rvu->hw, blkaddr);
@@ -6246,13 +6248,15 @@ int rvu_nix_mcast_update_mcam_entry(struct rvu *rvu, u16 pcifunc,
return NIX_AF_ERR_INVALID_NIXBLK;
mcast_grp = &nix_hw->mcast_grp;
+ mutex_lock(&mcast_grp->mcast_grp_lock);
elem = rvu_nix_mcast_find_grp_elem(mcast_grp, mcast_grp_idx);
if (!elem)
- return NIX_AF_ERR_INVALID_MCAST_GRP;
-
- elem->mcam_index = mcam_index;
+ ret = NIX_AF_ERR_INVALID_MCAST_GRP;
+ else
+ elem->mcam_index = mcam_index;
- return 0;
+ mutex_unlock(&mcast_grp->mcast_grp_lock);
+ return ret;
}
int rvu_mbox_handler_nix_mcast_grp_create(struct rvu *rvu,
@@ -6306,6 +6310,13 @@ int rvu_mbox_handler_nix_mcast_grp_destroy(struct rvu *rvu,
return err;
mcast_grp = &nix_hw->mcast_grp;
+
+ /* If AF is requesting for the deletion,
+ * then AF is already taking the lock
+ */
+ if (!req->is_af)
+ mutex_lock(&mcast_grp->mcast_grp_lock);
+
elem = rvu_nix_mcast_find_grp_elem(mcast_grp, req->mcast_grp_idx);
if (!elem)
return NIX_AF_ERR_INVALID_MCAST_GRP;
@@ -6333,12 +6344,6 @@ int rvu_mbox_handler_nix_mcast_grp_destroy(struct rvu *rvu,
mutex_unlock(&mcast->mce_lock);
delete_grp:
- /* If AF is requesting for the deletion,
- * then AF is already taking the lock
- */
- if (!req->is_af)
- mutex_lock(&mcast_grp->mcast_grp_lock);
-
list_del(&elem->list);
kfree(elem);
mcast_grp->count--;
@@ -6370,9 +6375,20 @@ int rvu_mbox_handler_nix_mcast_grp_update(struct rvu *rvu,
return err;
mcast_grp = &nix_hw->mcast_grp;
+
+ /* If AF is requesting for the updation,
+ * then AF is already taking the lock
+ */
+ if (!req->is_af)
+ mutex_lock(&mcast_grp->mcast_grp_lock);
+
elem = rvu_nix_mcast_find_grp_elem(mcast_grp, req->mcast_grp_idx);
- if (!elem)
+ if (!elem) {
+ if (!req->is_af)
+ mutex_unlock(&mcast_grp->mcast_grp_lock);
+
return NIX_AF_ERR_INVALID_MCAST_GRP;
+ }
/* If any pcifunc matches the group's pcifunc, then we can
* delete the entire group.
@@ -6383,8 +6399,11 @@ int rvu_mbox_handler_nix_mcast_grp_update(struct rvu *rvu,
/* Delete group */
dreq.hdr.pcifunc = elem->pcifunc;
dreq.mcast_grp_idx = elem->mcast_grp_idx;
- dreq.is_af = req->is_af;
+ dreq.is_af = 1;
rvu_mbox_handler_nix_mcast_grp_destroy(rvu, &dreq, NULL);
+ if (!req->is_af)
+ mutex_unlock(&mcast_grp->mcast_grp_lock);
+
return 0;
}
}
@@ -6467,5 +6486,8 @@ int rvu_mbox_handler_nix_mcast_grp_update(struct rvu *rvu,
done:
mutex_unlock(&mcast->mce_lock);
+ if (!req->is_af)
+ mutex_unlock(&mcast_grp->mcast_grp_lock);
+
return ret;
}
--
2.25.1
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