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Date: Fri, 15 Dec 2023 18:07:41 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-kernel@...r.kernel.org,
netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Boqun Feng <boqun.feng@...il.com>,
Daniel Borkmann <daniel@...earbox.net>,
Eric Dumazet <edumazet@...gle.com>,
Frederic Weisbecker <frederic@...nel.org>,
Ingo Molnar <mingo@...hat.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Waiman Long <longman@...hat.com>,
Will Deacon <will@...nel.org>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Alexei Starovoitov <ast@...nel.org>,
Edward Cree <ecree.xilinx@...il.com>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>,
Leon Romanovsky <leon@...nel.org>,
Louis Peens <louis.peens@...igine.com>,
Martin Habets <habetsm.xilinx@...il.com>,
Saeed Mahameed <saeedm@...dia.com>,
Tariq Toukan <tariqt@...dia.com>,
bpf@...r.kernel.org,
linux-net-drivers@....com,
linux-rdma@...r.kernel.org,
oss-drivers@...igine.com
Subject: [PATCH net-next 22/24] net: mellanox, nfp, sfc: Use nested-BH locking for XDP redirect.
The per-CPU variables used during bpf_prog_run_xdp() invocation and
later during xdp_do_redirect() rely on disabled BH for their protection.
Without locking in local_bh_disable() on PREEMPT_RT these data structure
require explicit locking.
This is a follow-up on the previous change which introduced
bpf_run_lock.redirect_lock and uses it now within drivers.
The simple way is to acquire the lock before bpf_prog_run_xdp() is
invoked and hold it until the end of function.
This does not always work because some drivers (cpsw, atlantic) invoke
xdp_do_flush() in the same context.
Acquiring the lock in bpf_prog_run_xdp() and dropping in
xdp_do_redirect() (without touching drivers) does not work because not
all driver, which use bpf_prog_run_xdp(), do support XDP_REDIRECT (and
invoke xdp_do_redirect()).
Ideally the minimal locking scope would be bpf_prog_run_xdp() +
xdp_do_redirect() and everything else (error recovery, DMA unmapping,
free/ alloc of memory, …) would happen outside of the locked section.
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Edward Cree <ecree.xilinx@...il.com>
Cc: Jesper Dangaard Brouer <hawk@...nel.org>
Cc: John Fastabend <john.fastabend@...il.com>
Cc: Leon Romanovsky <leon@...nel.org>
Cc: Louis Peens <louis.peens@...igine.com>
Cc: Martin Habets <habetsm.xilinx@...il.com>
Cc: Saeed Mahameed <saeedm@...dia.com>
Cc: Tariq Toukan <tariqt@...dia.com>
Cc: bpf@...r.kernel.org
Cc: linux-net-drivers@....com
Cc: linux-rdma@...r.kernel.org
Cc: oss-drivers@...igine.com
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
drivers/net/ethernet/mellanox/mlx4/en_rx.c | 1 +
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c | 1 +
drivers/net/ethernet/netronome/nfp/nfd3/dp.c | 3 ++-
drivers/net/ethernet/netronome/nfp/nfd3/xsk.c | 1 +
drivers/net/ethernet/netronome/nfp/nfdk/dp.c | 3 ++-
drivers/net/ethernet/sfc/rx.c | 1 +
drivers/net/ethernet/sfc/siena/rx.c | 1 +
7 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index a09b6e05337d9..c0a3ac3405bc5 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -833,6 +833,7 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
mxbuf.ring = ring;
mxbuf.dev = dev;
+ guard(local_lock_nested_bh)(&bpf_run_lock.redirect_lock);
act = bpf_prog_run_xdp(xdp_prog, &mxbuf.xdp);
length = mxbuf.xdp.data_end - mxbuf.xdp.data;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
index 7decc81ed33a9..b4e3c6a5a6da6 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
@@ -269,6 +269,7 @@ bool mlx5e_xdp_handle(struct mlx5e_rq *rq,
u32 act;
int err;
+ guard(local_lock_nested_bh)(&bpf_run_lock.redirect_lock);
act = bpf_prog_run_xdp(prog, xdp);
switch (act) {
case XDP_PASS:
diff --git a/drivers/net/ethernet/netronome/nfp/nfd3/dp.c b/drivers/net/ethernet/netronome/nfp/nfd3/dp.c
index 17381bfc15d72..a041b55514aa3 100644
--- a/drivers/net/ethernet/netronome/nfp/nfd3/dp.c
+++ b/drivers/net/ethernet/netronome/nfp/nfd3/dp.c
@@ -1011,7 +1011,8 @@ static int nfp_nfd3_rx(struct nfp_net_rx_ring *rx_ring, int budget)
pkt_off - NFP_NET_RX_BUF_HEADROOM,
pkt_len, true);
- act = bpf_prog_run_xdp(xdp_prog, &xdp);
+ scoped_guard(local_lock_nested_bh, &bpf_run_lock.redirect_lock)
+ act = bpf_prog_run_xdp(xdp_prog, &xdp);
pkt_len = xdp.data_end - xdp.data;
pkt_off += xdp.data - orig_data;
diff --git a/drivers/net/ethernet/netronome/nfp/nfd3/xsk.c b/drivers/net/ethernet/netronome/nfp/nfd3/xsk.c
index 45be6954d5aae..38f2d4c2b5b7c 100644
--- a/drivers/net/ethernet/netronome/nfp/nfd3/xsk.c
+++ b/drivers/net/ethernet/netronome/nfp/nfd3/xsk.c
@@ -216,6 +216,7 @@ nfp_nfd3_xsk_rx(struct nfp_net_rx_ring *rx_ring, int budget,
}
}
+ guard(local_lock_nested_bh)(&bpf_run_lock.redirect_lock);
act = bpf_prog_run_xdp(xdp_prog, xrxbuf->xdp);
pkt_len = xrxbuf->xdp->data_end - xrxbuf->xdp->data;
diff --git a/drivers/net/ethernet/netronome/nfp/nfdk/dp.c b/drivers/net/ethernet/netronome/nfp/nfdk/dp.c
index 8d78c6faefa8a..af0a36c4fb018 100644
--- a/drivers/net/ethernet/netronome/nfp/nfdk/dp.c
+++ b/drivers/net/ethernet/netronome/nfp/nfdk/dp.c
@@ -1130,7 +1130,8 @@ static int nfp_nfdk_rx(struct nfp_net_rx_ring *rx_ring, int budget)
pkt_off - NFP_NET_RX_BUF_HEADROOM,
pkt_len, true);
- act = bpf_prog_run_xdp(xdp_prog, &xdp);
+ scoped_guard(local_lock_nested_bh, &bpf_run_lock.redirect_lock)
+ act = bpf_prog_run_xdp(xdp_prog, &xdp);
pkt_len = xdp.data_end - xdp.data;
pkt_off += xdp.data - orig_data;
diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c
index f77a2d3ef37ec..3712d29150af5 100644
--- a/drivers/net/ethernet/sfc/rx.c
+++ b/drivers/net/ethernet/sfc/rx.c
@@ -291,6 +291,7 @@ static bool efx_do_xdp(struct efx_nic *efx, struct efx_channel *channel,
xdp_prepare_buff(&xdp, *ehp - EFX_XDP_HEADROOM, EFX_XDP_HEADROOM,
rx_buf->len, false);
+ guard(local_lock_nested_bh)(&bpf_run_lock.redirect_lock);
xdp_act = bpf_prog_run_xdp(xdp_prog, &xdp);
offset = (u8 *)xdp.data - *ehp;
diff --git a/drivers/net/ethernet/sfc/siena/rx.c b/drivers/net/ethernet/sfc/siena/rx.c
index 98d3c0743c0f5..6bfc4cd1c83e0 100644
--- a/drivers/net/ethernet/sfc/siena/rx.c
+++ b/drivers/net/ethernet/sfc/siena/rx.c
@@ -291,6 +291,7 @@ static bool efx_do_xdp(struct efx_nic *efx, struct efx_channel *channel,
xdp_prepare_buff(&xdp, *ehp - EFX_XDP_HEADROOM, EFX_XDP_HEADROOM,
rx_buf->len, false);
+ guard(local_lock_nested_bh)(&bpf_run_lock.redirect_lock);
xdp_act = bpf_prog_run_xdp(xdp_prog, &xdp);
offset = (u8 *)xdp.data - *ehp;
--
2.43.0
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