[pull request][net 00/11] mlx5 fixes 2022-01-06

[pull request][net 00/11] mlx5 fixes 2022-01-06

[Saeed Mahameed]

From: Saeed Mahameed <saeedm@nvidia.com>

Hi Dave, Hi Jakub,

This series provides bug fixes to mlx5 driver.
Please pull and let me know if there is any problem.

Thanks,
Saeed.


The following changes since commit 36595d8ad46d9e4c41cc7c48c4405b7c3322deac:

  net/smc: Reset conn->lgr when link group registration fails (2022-01-06 13:54:06 +0000)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux.git tags/mlx5-fixes-2022-01-06

for you to fetch changes up to 4f6626b0e140867fd6d5a2e9d4ceaef97f10f46a:

  Revert "net/mlx5: Add retry mechanism to the command entry index allocation" (2022-01-06 16:55:42 -0800)

----------------------------------------------------------------
mlx5-fixes-2022-01-06

----------------------------------------------------------------
Aya Levin (3):
      net/mlx5e: Fix page DMA map/unmap attributes
      Revert "net/mlx5e: Block offload of outer header csum for UDP tunnels"
      Revert "net/mlx5e: Block offload of outer header csum for GRE tunnel"

Dima Chumak (1):
      net/mlx5e: Fix nullptr on deleting mirroring rule

Maor Dickman (3):
      net/mlx5e: Fix wrong usage of fib_info_nh when routes with nexthop objects are used
      net/mlx5e: Don't block routes with nexthop objects in SW
      net/mlx5e: Sync VXLAN udp ports during uplink representor profile change

Moshe Shemesh (2):
      net/mlx5: Set command entry semaphore up once got index free
      Revert "net/mlx5: Add retry mechanism to the command entry index allocation"

Paul Blakey (1):
      net/mlx5e: Fix matching on modified inner ip_ecn bits

Shay Drory (1):
      net/mlx5: Fix access to sf_dev_table on allocation failure

 drivers/net/ethernet/mellanox/mlx5/core/cmd.c      |  36 ++-----
 .../ethernet/mellanox/mlx5/core/en/tc_tun_encap.c  |   2 +
 .../net/ethernet/mellanox/mlx5/core/en/xsk/pool.c  |   4 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c  |  19 ++--
 drivers/net/ethernet/mellanox/mlx5/core/en_rep.c   |   3 +
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c    |   7 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c    | 120 ++++++++++++++++++++-
 .../ethernet/mellanox/mlx5/core/eswitch_offloads.c |  28 ++---
 drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c   |   6 +-
 .../net/ethernet/mellanox/mlx5/core/sf/dev/dev.c   |   5 +-
 10 files changed, 165 insertions(+), 65 deletions(-)

[net 01/11] net/mlx5e: Fix page DMA map/unmap attributes

[Saeed Mahameed]

From: Aya Levin <ayal@nvidia.com>

Driver initiates DMA sync, hence it may skip CPU sync. Add
DMA_ATTR_SKIP_CPU_SYNC as input attribute both to dma_map_page and
dma_unmap_page to avoid redundant sync with the CPU.
When forcing the device to work with SWIOTLB, the extra sync might cause
data corruption. The driver unmaps the whole page while the hardware
used just a part of the bounce buffer. So syncing overrides the entire
page with bounce buffer that only partially contains real data.

Fixes: bc77b240b3c5 ("net/mlx5e: Add fragmented memory support for RX multi packet WQE")
Fixes: db05815b36cb ("net/mlx5e: Add XSK zero-copy support")
Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Gal Pressman <gal@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/xsk/pool.c | 4 ++--
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c       | 7 ++++---
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/pool.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/pool.c
index 7b562d2c8a19..279cd8f4e79f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/pool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/pool.c
@@ -11,13 +11,13 @@ static int mlx5e_xsk_map_pool(struct mlx5e_priv *priv,
 {
 	struct device *dev = mlx5_core_dma_dev(priv->mdev);
 
-	return xsk_pool_dma_map(pool, dev, 0);
+	return xsk_pool_dma_map(pool, dev, DMA_ATTR_SKIP_CPU_SYNC);
 }
 
 static void mlx5e_xsk_unmap_pool(struct mlx5e_priv *priv,
 				 struct xsk_buff_pool *pool)
 {
-	return xsk_pool_dma_unmap(pool, 0);
+	return xsk_pool_dma_unmap(pool, DMA_ATTR_SKIP_CPU_SYNC);
 }
 
 static int mlx5e_xsk_get_pools(struct mlx5e_xsk *xsk)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index 793511d5ee4c..dfc6604b9538 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -278,8 +278,8 @@ static inline int mlx5e_page_alloc_pool(struct mlx5e_rq *rq,
 	if (unlikely(!dma_info->page))
 		return -ENOMEM;
 
-	dma_info->addr = dma_map_page(rq->pdev, dma_info->page, 0,
-				      PAGE_SIZE, rq->buff.map_dir);
+	dma_info->addr = dma_map_page_attrs(rq->pdev, dma_info->page, 0, PAGE_SIZE,
+					    rq->buff.map_dir, DMA_ATTR_SKIP_CPU_SYNC);
 	if (unlikely(dma_mapping_error(rq->pdev, dma_info->addr))) {
 		page_pool_recycle_direct(rq->page_pool, dma_info->page);
 		dma_info->page = NULL;
@@ -300,7 +300,8 @@ static inline int mlx5e_page_alloc(struct mlx5e_rq *rq,
 
 void mlx5e_page_dma_unmap(struct mlx5e_rq *rq, struct mlx5e_dma_info *dma_info)
 {
-	dma_unmap_page(rq->pdev, dma_info->addr, PAGE_SIZE, rq->buff.map_dir);
+	dma_unmap_page_attrs(rq->pdev, dma_info->addr, PAGE_SIZE, rq->buff.map_dir,
+			     DMA_ATTR_SKIP_CPU_SYNC);
 }
 
 void mlx5e_page_release_dynamic(struct mlx5e_rq *rq,
-- 
2.33.1

[net 02/11] net/mlx5e: Fix nullptr on deleting mirroring rule

[Saeed Mahameed]

From: Dima Chumak <dchumak@nvidia.com>

Deleting a Tc rule with multiple outputs, one of which is internal port,
like this one:

  tc filter del dev enp8s0f0_0 ingress protocol ip pref 5 flower \
      dst_mac 0c:42:a1:d1:d0:88 \
      src_mac e4:ea:09:08:00:02 \
      action tunnel_key  set \
          src_ip 0.0.0.0 \
          dst_ip 7.7.7.8 \
          id 8 \
          dst_port 4789 \
      action mirred egress mirror dev vxlan_sys_4789 pipe \
      action mirred egress redirect dev enp8s0f0_1

Triggers a call trace:

  BUG: kernel NULL pointer dereference, address: 0000000000000230
  RIP: 0010:del_sw_hw_rule+0x2b/0x1f0 [mlx5_core]
  Call Trace:
   tree_remove_node+0x16/0x30 [mlx5_core]
   mlx5_del_flow_rules+0x51/0x160 [mlx5_core]
   __mlx5_eswitch_del_rule+0x4b/0x170 [mlx5_core]
   mlx5e_tc_del_fdb_flow+0x295/0x550 [mlx5_core]
   mlx5e_flow_put+0x1f/0x70 [mlx5_core]
   mlx5e_delete_flower+0x286/0x390 [mlx5_core]
   tc_setup_cb_destroy+0xac/0x170
   fl_hw_destroy_filter+0x94/0xc0 [cls_flower]
   __fl_delete+0x15e/0x170 [cls_flower]
   fl_delete+0x36/0x80 [cls_flower]
   tc_del_tfilter+0x3a6/0x6e0
   rtnetlink_rcv_msg+0xe5/0x360
   ? rtnl_calcit.isra.0+0x110/0x110
   netlink_rcv_skb+0x46/0x110
   netlink_unicast+0x16b/0x200
   netlink_sendmsg+0x202/0x3d0
   sock_sendmsg+0x33/0x40
   ____sys_sendmsg+0x1c3/0x200
   ? copy_msghdr_from_user+0xd6/0x150
   ___sys_sendmsg+0x88/0xd0
   ? ___sys_recvmsg+0x88/0xc0
   ? do_futex+0x10c/0x460
   __sys_sendmsg+0x59/0xa0
   do_syscall_64+0x48/0x140
   entry_SYSCALL_64_after_hwframe+0x44/0xa9

Fix by disabling offloading for flows matching
esw_is_chain_src_port_rewrite() which have more than one output.

Fixes: 10742efc20a4 ("net/mlx5e: VF tunnel TX traffic offloading")
Signed-off-by: Dima Chumak <dchumak@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 .../mellanox/mlx5/core/eswitch_offloads.c     | 28 ++++++++++---------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index 32bc08a39925..ccb66428aeb5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -295,26 +295,28 @@ esw_setup_chain_src_port_rewrite(struct mlx5_flow_destination *dest,
 				 int *i)
 {
 	struct mlx5_esw_flow_attr *esw_attr = attr->esw_attr;
-	int j, err;
+	int err;
 
 	if (!(attr->flags & MLX5_ESW_ATTR_FLAG_SRC_REWRITE))
 		return -EOPNOTSUPP;
 
-	for (j = esw_attr->split_count; j < esw_attr->out_count; j++, (*i)++) {
-		err = esw_setup_chain_dest(dest, flow_act, chains, attr->dest_chain, 1, 0, *i);
-		if (err)
-			goto err_setup_chain;
+	/* flow steering cannot handle more than one dest with the same ft
+	 * in a single flow
+	 */
+	if (esw_attr->out_count - esw_attr->split_count > 1)
+		return -EOPNOTSUPP;
 
-		if (esw_attr->dests[j].pkt_reformat) {
-			flow_act->action |= MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT;
-			flow_act->pkt_reformat = esw_attr->dests[j].pkt_reformat;
-		}
+	err = esw_setup_chain_dest(dest, flow_act, chains, attr->dest_chain, 1, 0, *i);
+	if (err)
+		return err;
+
+	if (esw_attr->dests[esw_attr->split_count].pkt_reformat) {
+		flow_act->action |= MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT;
+		flow_act->pkt_reformat = esw_attr->dests[esw_attr->split_count].pkt_reformat;
 	}
-	return 0;
+	(*i)++;
 
-err_setup_chain:
-	esw_put_dest_tables_loop(esw, attr, esw_attr->split_count, j);
-	return err;
+	return 0;
 }
 
 static void esw_cleanup_chain_src_port_rewrite(struct mlx5_eswitch *esw,
-- 
2.33.1

[net 03/11] net/mlx5e: Fix wrong usage of fib_info_nh when routes with nexthop objects are used

[Saeed Mahameed]

From: Maor Dickman <maord@nvidia.com>

Creating routes with nexthop objects while in switchdev mode leads to access to
un-allocated memory and trigger bellow call trace due to hitting WARN_ON.
This is caused due to illegal usage of fib_info_nh in TC tunnel FIB event handling to
resolve the FIB device while fib_info built in with nexthop.

Fixed by ignoring attempts to use nexthop objects with routes until support can be
properly added.

WARNING: CPU: 1 PID: 1724 at include/net/nexthop.h:468 mlx5e_tc_tun_fib_event+0x448/0x570 [mlx5_core]
CPU: 1 PID: 1724 Comm: ip Not tainted 5.15.0_for_upstream_min_debug_2021_11_09_02_04 #1
RIP: 0010:mlx5e_tc_tun_fib_event+0x448/0x570 [mlx5_core]
RSP: 0018:ffff8881349f7910 EFLAGS: 00010202
RAX: ffff8881492f1980 RBX: ffff8881349f79e8 RCX: 0000000000000000
RDX: ffff8881349f79e8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8881349f7950 R08: 00000000000000fe R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88811e9d0000
R13: ffff88810eb62000 R14: ffff888106710268 R15: 0000000000000018
FS:  00007f1d5ca6e800(0000) GS:ffff88852c880000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffedba44ff8 CR3: 0000000129808004 CR4: 0000000000370ea0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 atomic_notifier_call_chain+0x42/0x60
 call_fib_notifiers+0x21/0x40
 fib_table_insert+0x479/0x6d0
 ? try_charge_memcg+0x480/0x6d0
 inet_rtm_newroute+0x65/0xb0
 rtnetlink_rcv_msg+0x2af/0x360
 ? page_add_file_rmap+0x13/0x130
 ? do_set_pte+0xcd/0x120
 ? rtnl_calcit.isra.0+0x120/0x120
 netlink_rcv_skb+0x4e/0xf0
 netlink_unicast+0x1ee/0x2b0
 netlink_sendmsg+0x22e/0x460
 sock_sendmsg+0x33/0x40
 ____sys_sendmsg+0x1d1/0x1f0
 ___sys_sendmsg+0xab/0xf0
 ? __mod_memcg_lruvec_state+0x40/0x60
 ? __mod_lruvec_page_state+0x95/0xd0
 ? page_add_new_anon_rmap+0x4e/0xf0
 ? __handle_mm_fault+0xec6/0x1470
 __sys_sendmsg+0x51/0x90
 ? internal_get_user_pages_fast+0x480/0xa10
 do_syscall_64+0x3d/0x90
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Fixes: 8914add2c9e5 ("net/mlx5e: Handle FIB events to update tunnel endpoint device")
Signed-off-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Vlad Buslov <vladbu@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
index 042b1abe1437..62cbd15ffc34 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
@@ -1579,6 +1579,8 @@ mlx5e_init_fib_work_ipv4(struct mlx5e_priv *priv,
 	struct net_device *fib_dev;
 
 	fen_info = container_of(info, struct fib_entry_notifier_info, info);
+	if (fen_info->fi->nh)
+		return NULL;
 	fib_dev = fib_info_nh(fen_info->fi, 0)->fib_nh_dev;
 	if (!fib_dev || fib_dev->netdev_ops != &mlx5e_netdev_ops ||
 	    fen_info->dst_len != 32)
-- 
2.33.1

[net 04/11] net/mlx5e: Don't block routes with nexthop objects in SW

[Saeed Mahameed]

From: Maor Dickman <maord@nvidia.com>

Routes with nexthop objects is currently not supported by multipath offload
and any attempts to use it is blocked, however this also block adding SW
routes with nexthop.

Resolve this by returning NOTIFY_DONE instead of an error which will allow such
a route to be created in SW but not offloaded.

This fix also solve an issue which block adding such routes on different devices
due to missing check if the route FIB device is one of multipath devices.

Fixes: 6a87afc072c3 ("mlx5: Fail attempts to use routes with nexthop objects")
Signed-off-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c b/drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c
index bf4d3cbefa63..1ca01a5b6cdd 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c
@@ -268,10 +268,8 @@ static int mlx5_lag_fib_event(struct notifier_block *nb,
 		fen_info = container_of(info, struct fib_entry_notifier_info,
 					info);
 		fi = fen_info->fi;
-		if (fi->nh) {
-			NL_SET_ERR_MSG_MOD(info->extack, "IPv4 route with nexthop objects is not supported");
-			return notifier_from_errno(-EINVAL);
-		}
+		if (fi->nh)
+			return NOTIFY_DONE;
 		fib_dev = fib_info_nh(fen_info->fi, 0)->fib_nh_dev;
 		if (fib_dev != ldev->pf[MLX5_LAG_P1].netdev &&
 		    fib_dev != ldev->pf[MLX5_LAG_P2].netdev) {
-- 
2.33.1

[net 05/11] Revert "net/mlx5e: Block offload of outer header csum for UDP tunnels"

[Saeed Mahameed]

From: Aya Levin <ayal@nvidia.com>

This reverts commit 6d6727dddc7f93fcc155cb8d0c49c29ae0e71122.

Although the NIC doesn't support offload of outer header CSUM, using
gso_partial_features allows offloading the tunnel's segmentation. The
driver relies on the stack CSUM calculation of the outer header. For
this, NETIF_F_GSO_UDP_TUNNEL_CSUM must be a member of the device's
features.

Fixes: 6d6727dddc7f ("net/mlx5e: Block offload of outer header csum for UDP tunnels")
Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Gal Pressman <gal@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 41379844eee1..de8acd3217c1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -4789,9 +4789,13 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
 	}
 
 	if (mlx5_vxlan_allowed(mdev->vxlan) || mlx5_geneve_tx_allowed(mdev)) {
-		netdev->hw_features     |= NETIF_F_GSO_UDP_TUNNEL;
-		netdev->hw_enc_features |= NETIF_F_GSO_UDP_TUNNEL;
-		netdev->vlan_features |= NETIF_F_GSO_UDP_TUNNEL;
+		netdev->hw_features     |= NETIF_F_GSO_UDP_TUNNEL |
+					   NETIF_F_GSO_UDP_TUNNEL_CSUM;
+		netdev->hw_enc_features |= NETIF_F_GSO_UDP_TUNNEL |
+					   NETIF_F_GSO_UDP_TUNNEL_CSUM;
+		netdev->gso_partial_features = NETIF_F_GSO_UDP_TUNNEL_CSUM;
+		netdev->vlan_features |= NETIF_F_GSO_UDP_TUNNEL |
+					 NETIF_F_GSO_UDP_TUNNEL_CSUM;
 	}
 
 	if (mlx5e_tunnel_proto_supported_tx(mdev, IPPROTO_GRE)) {
-- 
2.33.1

[net 06/11] Revert "net/mlx5e: Block offload of outer header csum for GRE tunnel"

[Saeed Mahameed]

From: Aya Levin <ayal@nvidia.com>

This reverts commit 54e1217b90486c94b26f24dcee1ee5ef5372f832.

Although the NIC doesn't support offload of outer header CSUM, using
gso_partial_features allows offloading the tunnel's segmentation. The
driver relies on the stack CSUM calculation of the outer header. For
this, NETIF_F_GSO_GRE_CSUM must be a member of the device's features.

Fixes: 54e1217b9048 ("net/mlx5e: Block offload of outer header csum for GRE tunnel")
Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Gal Pressman <gal@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index de8acd3217c1..d92b82cdfd4e 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -4799,9 +4799,12 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
 	}
 
 	if (mlx5e_tunnel_proto_supported_tx(mdev, IPPROTO_GRE)) {
-		netdev->hw_features     |= NETIF_F_GSO_GRE;
-		netdev->hw_enc_features |= NETIF_F_GSO_GRE;
-		netdev->gso_partial_features |= NETIF_F_GSO_GRE;
+		netdev->hw_features     |= NETIF_F_GSO_GRE |
+					   NETIF_F_GSO_GRE_CSUM;
+		netdev->hw_enc_features |= NETIF_F_GSO_GRE |
+					   NETIF_F_GSO_GRE_CSUM;
+		netdev->gso_partial_features |= NETIF_F_GSO_GRE |
+						NETIF_F_GSO_GRE_CSUM;
 	}
 
 	if (mlx5e_tunnel_proto_supported_tx(mdev, IPPROTO_IPIP)) {
-- 
2.33.1

[net 07/11] net/mlx5e: Fix matching on modified inner ip_ecn bits

[Saeed Mahameed]

From: Paul Blakey <paulb@nvidia.com>

Tunnel device follows RFC 6040, and during decapsulation inner
ip_ecn might change depending on inner and outer ip_ecn as follows:

 +---------+----------------------------------------+
 |Arriving |         Arriving Outer Header          |
 |   Inner +---------+---------+---------+----------+
 |  Header | Not-ECT | ECT(0)  | ECT(1)  |   CE     |
 +---------+---------+---------+---------+----------+
 | Not-ECT | Not-ECT | Not-ECT | Not-ECT | <drop>   |
 |  ECT(0) |  ECT(0) | ECT(0)  | ECT(1)  |   CE*    |
 |  ECT(1) |  ECT(1) | ECT(1)  | ECT(1)* |   CE*    |
 |    CE   |   CE    |  CE     | CE      |   CE     |
 +---------+---------+---------+---------+----------+

Cells marked above are changed from original inner packet ip_ecn value.

Tc then matches on the modified inner ip_ecn, but hw offload which
matches the inner ip_ecn value before decap, will fail.

Fix that by mapping all the cases of outer and inner ip_ecn matching,
and only supporting cases where we know inner wouldn't be changed by
decap, or in the outer ip_ecn=CE case, inner ip_ecn didn't matter.

Fixes: bcef735c59f2 ("net/mlx5e: Offload TC matching on tos/ttl for ip tunnels")
Signed-off-by: Paul Blakey <paulb@nvidia.com>
Reviewed-by: Oz Shlomo <ozsh@nvidia.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 .../net/ethernet/mellanox/mlx5/core/en_tc.c   | 120 +++++++++++++++++-
 1 file changed, 116 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 5e454a14428f..9b3adaccc9be 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -1949,6 +1949,111 @@ u8 mlx5e_tc_get_ip_version(struct mlx5_flow_spec *spec, bool outer)
 	return ip_version;
 }
 
+/* Tunnel device follows RFC 6040, see include/net/inet_ecn.h.
+ * And changes inner ip_ecn depending on inner and outer ip_ecn as follows:
+ *      +---------+----------------------------------------+
+ *      |Arriving |         Arriving Outer Header          |
+ *      |   Inner +---------+---------+---------+----------+
+ *      |  Header | Not-ECT | ECT(0)  | ECT(1)  |   CE     |
+ *      +---------+---------+---------+---------+----------+
+ *      | Not-ECT | Not-ECT | Not-ECT | Not-ECT | <drop>   |
+ *      |  ECT(0) |  ECT(0) | ECT(0)  | ECT(1)  |   CE*    |
+ *      |  ECT(1) |  ECT(1) | ECT(1)  | ECT(1)* |   CE*    |
+ *      |    CE   |   CE    |  CE     | CE      |   CE     |
+ *      +---------+---------+---------+---------+----------+
+ *
+ * Tc matches on inner after decapsulation on tunnel device, but hw offload matches
+ * the inner ip_ecn value before hardware decap action.
+ *
+ * Cells marked are changed from original inner packet ip_ecn value during decap, and
+ * so matching those values on inner ip_ecn before decap will fail.
+ *
+ * The following helper allows offload when inner ip_ecn won't be changed by outer ip_ecn,
+ * except for the outer ip_ecn = CE, where in all cases inner ip_ecn will be changed to CE,
+ * and such we can drop the inner ip_ecn=CE match.
+ */
+
+static int mlx5e_tc_verify_tunnel_ecn(struct mlx5e_priv *priv,
+				      struct flow_cls_offload *f,
+				      bool *match_inner_ecn)
+{
+	u8 outer_ecn_mask = 0, outer_ecn_key = 0, inner_ecn_mask = 0, inner_ecn_key = 0;
+	struct flow_rule *rule = flow_cls_offload_flow_rule(f);
+	struct netlink_ext_ack *extack = f->common.extack;
+	struct flow_match_ip match;
+
+	*match_inner_ecn = true;
+
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_IP)) {
+		flow_rule_match_enc_ip(rule, &match);
+		outer_ecn_key = match.key->tos & INET_ECN_MASK;
+		outer_ecn_mask = match.mask->tos & INET_ECN_MASK;
+	}
+
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IP)) {
+		flow_rule_match_ip(rule, &match);
+		inner_ecn_key = match.key->tos & INET_ECN_MASK;
+		inner_ecn_mask = match.mask->tos & INET_ECN_MASK;
+	}
+
+	if (outer_ecn_mask != 0 && outer_ecn_mask != INET_ECN_MASK) {
+		NL_SET_ERR_MSG_MOD(extack, "Partial match on enc_tos ecn bits isn't supported");
+		netdev_warn(priv->netdev, "Partial match on enc_tos ecn bits isn't supported");
+		return -EOPNOTSUPP;
+	}
+
+	if (!outer_ecn_mask) {
+		if (!inner_ecn_mask)
+			return 0;
+
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Matching on tos ecn bits without also matching enc_tos ecn bits isn't supported");
+		netdev_warn(priv->netdev,
+			    "Matching on tos ecn bits without also matching enc_tos ecn bits isn't supported");
+		return -EOPNOTSUPP;
+	}
+
+	if (inner_ecn_mask && inner_ecn_mask != INET_ECN_MASK) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Partial match on tos ecn bits with match on enc_tos ecn bits isn't supported");
+		netdev_warn(priv->netdev,
+			    "Partial match on tos ecn bits with match on enc_tos ecn bits isn't supported");
+		return -EOPNOTSUPP;
+	}
+
+	if (!inner_ecn_mask)
+		return 0;
+
+	/* Both inner and outer have full mask on ecn */
+
+	if (outer_ecn_key == INET_ECN_ECT_1) {
+		/* inner ecn might change by DECAP action */
+
+		NL_SET_ERR_MSG_MOD(extack, "Match on enc_tos ecn = ECT(1) isn't supported");
+		netdev_warn(priv->netdev, "Match on enc_tos ecn = ECT(1) isn't supported");
+		return -EOPNOTSUPP;
+	}
+
+	if (outer_ecn_key != INET_ECN_CE)
+		return 0;
+
+	if (inner_ecn_key != INET_ECN_CE) {
+		/* Can't happen in software, as packet ecn will be changed to CE after decap */
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Match on tos enc_tos ecn = CE while match on tos ecn != CE isn't supported");
+		netdev_warn(priv->netdev,
+			    "Match on tos enc_tos ecn = CE while match on tos ecn != CE isn't supported");
+		return -EOPNOTSUPP;
+	}
+
+	/* outer ecn = CE, inner ecn = CE, as decap will change inner ecn to CE in anycase,
+	 * drop match on inner ecn
+	 */
+	*match_inner_ecn = false;
+
+	return 0;
+}
+
 static int parse_tunnel_attr(struct mlx5e_priv *priv,
 			     struct mlx5e_tc_flow *flow,
 			     struct mlx5_flow_spec *spec,
@@ -2144,6 +2249,7 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 	struct flow_rule *rule = flow_cls_offload_flow_rule(f);
 	struct flow_dissector *dissector = rule->match.dissector;
 	enum fs_flow_table_type fs_type;
+	bool match_inner_ecn = true;
 	u16 addr_type = 0;
 	u8 ip_proto = 0;
 	u8 *match_level;
@@ -2197,6 +2303,10 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 			headers_c = get_match_inner_headers_criteria(spec);
 			headers_v = get_match_inner_headers_value(spec);
 		}
+
+		err = mlx5e_tc_verify_tunnel_ecn(priv, f, &match_inner_ecn);
+		if (err)
+			return err;
 	}
 
 	err = mlx5e_flower_parse_meta(filter_dev, f);
@@ -2420,10 +2530,12 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 		struct flow_match_ip match;
 
 		flow_rule_match_ip(rule, &match);
-		MLX5_SET(fte_match_set_lyr_2_4, headers_c, ip_ecn,
-			 match.mask->tos & 0x3);
-		MLX5_SET(fte_match_set_lyr_2_4, headers_v, ip_ecn,
-			 match.key->tos & 0x3);
+		if (match_inner_ecn) {
+			MLX5_SET(fte_match_set_lyr_2_4, headers_c, ip_ecn,
+				 match.mask->tos & 0x3);
+			MLX5_SET(fte_match_set_lyr_2_4, headers_v, ip_ecn,
+				 match.key->tos & 0x3);
+		}
 
 		MLX5_SET(fte_match_set_lyr_2_4, headers_c, ip_dscp,
 			 match.mask->tos >> 2);
-- 
2.33.1

[net 08/11] net/mlx5: Fix access to sf_dev_table on allocation failure

[Saeed Mahameed]

From: Shay Drory <shayd@nvidia.com>

Even when SF devices are supported, the SF device table allocation
can still fail.
In such case mlx5_sf_dev_supported still reports true, but SF device
table is invalid. This can result in NULL table access.

Hence, fix it by adding NULL table check.

Fixes: 1958fc2f0712 ("net/mlx5: SF, Add auxiliary device driver")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.c b/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.c
index f37db7cc32a6..7da012ff0d41 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.c
@@ -30,10 +30,7 @@ bool mlx5_sf_dev_allocated(const struct mlx5_core_dev *dev)
 {
 	struct mlx5_sf_dev_table *table = dev->priv.sf_dev_table;
 
-	if (!mlx5_sf_dev_supported(dev))
-		return false;
-
-	return !xa_empty(&table->devices);
+	return table && !xa_empty(&table->devices);
 }
 
 static ssize_t sfnum_show(struct device *dev, struct device_attribute *attr, char *buf)
-- 
2.33.1

[net 09/11] net/mlx5e: Sync VXLAN udp ports during uplink representor profile change

[Saeed Mahameed]

From: Maor Dickman <maord@nvidia.com>

Currently during NIC profile disablement all VXLAN udp ports offloaded to the
HW are flushed and during its enablement the driver send notification to
the stack to inform the core that the entire UDP tunnel port state has been
lost, uplink representor doesn't have the same behavior which can cause
VXLAN udp ports offload to be in bad state while moving between modes while
VXLAN interface exist.

Fixed by aligning the uplink representor profile behavior to the NIC behavior.

Fixes: 84db66124714 ("net/mlx5e: Move set vxlan nic info to profile init")
Signed-off-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_rep.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
index 48895d79796a..c0df4b1115b7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
@@ -50,6 +50,7 @@
 #include "fs_core.h"
 #include "lib/mlx5.h"
 #include "lib/devcom.h"
+#include "lib/vxlan.h"
 #define CREATE_TRACE_POINTS
 #include "diag/en_rep_tracepoint.h"
 #include "en_accel/ipsec.h"
@@ -1027,6 +1028,7 @@ static void mlx5e_uplink_rep_enable(struct mlx5e_priv *priv)
 	rtnl_lock();
 	if (netif_running(netdev))
 		mlx5e_open(netdev);
+	udp_tunnel_nic_reset_ntf(priv->netdev);
 	netif_device_attach(netdev);
 	rtnl_unlock();
 }
@@ -1048,6 +1050,7 @@ static void mlx5e_uplink_rep_disable(struct mlx5e_priv *priv)
 	mlx5_notifier_unregister(mdev, &priv->events_nb);
 	mlx5e_rep_tc_disable(priv);
 	mlx5_lag_remove_netdev(mdev, priv->netdev);
+	mlx5_vxlan_reset_to_default(mdev->vxlan);
 }
 
 static MLX5E_DEFINE_STATS_GRP(sw_rep, 0);
-- 
2.33.1

[net 10/11] net/mlx5: Set command entry semaphore up once got index free

[Saeed Mahameed]

From: Moshe Shemesh <moshe@nvidia.com>

Avoid a race where command work handler may fail to allocate command
entry index, by holding the command semaphore down till command entry
index is being freed.

Fixes: 410bd754cd73 ("net/mlx5: Add retry mechanism to the command entry index allocation")
Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Eran Ben Elisha <eranbe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/cmd.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
index a46284ca5172..f588503157d0 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
@@ -148,8 +148,12 @@ static void cmd_ent_put(struct mlx5_cmd_work_ent *ent)
 	if (!refcount_dec_and_test(&ent->refcnt))
 		return;
 
-	if (ent->idx >= 0)
-		cmd_free_index(ent->cmd, ent->idx);
+	if (ent->idx >= 0) {
+		struct mlx5_cmd *cmd = ent->cmd;
+
+		cmd_free_index(cmd, ent->idx);
+		up(ent->page_queue ? &cmd->pages_sem : &cmd->sem);
+	}
 
 	cmd_free_ent(ent);
 }
@@ -1602,8 +1606,6 @@ static void mlx5_cmd_comp_handler(struct mlx5_core_dev *dev, u64 vec, bool force
 	vector = vec & 0xffffffff;
 	for (i = 0; i < (1 << cmd->log_sz); i++) {
 		if (test_bit(i, &vector)) {
-			struct semaphore *sem;
-
 			ent = cmd->ent_arr[i];
 
 			/* if we already completed the command, ignore it */
@@ -1626,10 +1628,6 @@ static void mlx5_cmd_comp_handler(struct mlx5_core_dev *dev, u64 vec, bool force
 			    dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR)
 				cmd_ent_put(ent);
 
-			if (ent->page_queue)
-				sem = &cmd->pages_sem;
-			else
-				sem = &cmd->sem;
 			ent->ts2 = ktime_get_ns();
 			memcpy(ent->out->first.data, ent->lay->out, sizeof(ent->lay->out));
 			dump_command(dev, ent, 0);
@@ -1683,7 +1681,6 @@ static void mlx5_cmd_comp_handler(struct mlx5_core_dev *dev, u64 vec, bool force
 				 */
 				complete(&ent->done);
 			}
-			up(sem);
 		}
 	}
 }
-- 
2.33.1

[net 11/11] Revert "net/mlx5: Add retry mechanism to the command entry index allocation"

[Saeed Mahameed]

From: Moshe Shemesh <moshe@nvidia.com>

This reverts commit 410bd754cd73c4a2ac3856d9a03d7b08f9c906bf.

The reverted commit had added a retry mechanism to the command entry
index allocation. The previous patch ensures that there is a free
command entry index once the command work handler holds the command
semaphore. Thus the retry mechanism is not needed.

Fixes: 410bd754cd73 ("net/mlx5: Add retry mechanism to the command entry index allocation")
Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Eran Ben Elisha <eranbe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/cmd.c | 21 +------------------
 1 file changed, 1 insertion(+), 20 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
index f588503157d0..17fe05809653 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
@@ -904,25 +904,6 @@ static bool opcode_allowed(struct mlx5_cmd *cmd, u16 opcode)
 	return cmd->allowed_opcode == opcode;
 }
 
-static int cmd_alloc_index_retry(struct mlx5_cmd *cmd)
-{
-	unsigned long alloc_end = jiffies + msecs_to_jiffies(1000);
-	int idx;
-
-retry:
-	idx = cmd_alloc_index(cmd);
-	if (idx < 0 && time_before(jiffies, alloc_end)) {
-		/* Index allocation can fail on heavy load of commands. This is a temporary
-		 * situation as the current command already holds the semaphore, meaning that
-		 * another command completion is being handled and it is expected to release
-		 * the entry index soon.
-		 */
-		cpu_relax();
-		goto retry;
-	}
-	return idx;
-}
-
 bool mlx5_cmd_is_down(struct mlx5_core_dev *dev)
 {
 	return pci_channel_offline(dev->pdev) ||
@@ -950,7 +931,7 @@ static void cmd_work_handler(struct work_struct *work)
 	sem = ent->page_queue ? &cmd->pages_sem : &cmd->sem;
 	down(sem);
 	if (!ent->page_queue) {
-		alloc_ret = cmd_alloc_index_retry(cmd);
+		alloc_ret = cmd_alloc_index(cmd);
 		if (alloc_ret < 0) {
 			mlx5_core_err_rl(dev, "failed to allocate command entry\n");
 			if (ent->callback) {
-- 
2.33.1

Re: [net 01/11] net/mlx5e: Fix page DMA map/unmap attributes

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net.git (master)
by Saeed Mahameed <saeedm@nvidia.com>:

On Thu,  6 Jan 2022 16:58:21 -0800 you wrote:
> From: Aya Levin <ayal@nvidia.com>
> 
> Driver initiates DMA sync, hence it may skip CPU sync. Add
> DMA_ATTR_SKIP_CPU_SYNC as input attribute both to dma_map_page and
> dma_unmap_page to avoid redundant sync with the CPU.
> When forcing the device to work with SWIOTLB, the extra sync might cause
> data corruption. The driver unmaps the whole page while the hardware
> used just a part of the bounce buffer. So syncing overrides the entire
> page with bounce buffer that only partially contains real data.
> 
> [...]

Here is the summary with links:
  - [net,01/11] net/mlx5e: Fix page DMA map/unmap attributes
    https://git.kernel.org/netdev/net/c/0b7cfa4082fb
  - [net,02/11] net/mlx5e: Fix nullptr on deleting mirroring rule
    https://git.kernel.org/netdev/net/c/de31854ece17
  - [net,03/11] net/mlx5e: Fix wrong usage of fib_info_nh when routes with nexthop objects are used
    https://git.kernel.org/netdev/net/c/885751eb1b01
  - [net,04/11] net/mlx5e: Don't block routes with nexthop objects in SW
    https://git.kernel.org/netdev/net/c/9e72a55a3c9d
  - [net,05/11] Revert "net/mlx5e: Block offload of outer header csum for UDP tunnels"
    https://git.kernel.org/netdev/net/c/64050cdad098
  - [net,06/11] Revert "net/mlx5e: Block offload of outer header csum for GRE tunnel"
    https://git.kernel.org/netdev/net/c/01c3fd113ef5
  - [net,07/11] net/mlx5e: Fix matching on modified inner ip_ecn bits
    https://git.kernel.org/netdev/net/c/b6dfff21a170
  - [net,08/11] net/mlx5: Fix access to sf_dev_table on allocation failure
    https://git.kernel.org/netdev/net/c/a1c7c49c2091
  - [net,09/11] net/mlx5e: Sync VXLAN udp ports during uplink representor profile change
    https://git.kernel.org/netdev/net/c/07f6dc4024ea
  - [net,10/11] net/mlx5: Set command entry semaphore up once got index free
    https://git.kernel.org/netdev/net/c/8e715cd613a1
  - [net,11/11] Revert "net/mlx5: Add retry mechanism to the command entry index allocation"
    https://git.kernel.org/netdev/net/c/4f6626b0e140

You are awesome, thank you!
-- 
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