From 01c046e88a32e61576019267fb1368a3e228218a Mon Sep 17 00:00:00 2001 From: Sabrina Dubroca Date: Wed, 2 Nov 2022 22:33:12 +0100 Subject: [PATCH] Revert "net: macsec: report real_dev features when HW offloading is enabled" This reverts commit 8480405e591a82a0594e2e274365f9ead724e334. That commit tried to improve the performance of macsec offload by taking advantage of some of the NIC's features, but in doing so, broke macsec offload when the lower device supports both macsec and ipsec offload, as the ipsec offload feature flags (mainly NETIF_F_HW_ESP) were copied from the real device. Since the macsec device doesn't provide xdo_* ops, the XFRM core rejects the registration of the new macsec device in xfrm_api_check. Example perf trace when running ip link add link eni1np1 type macsec port 4 offload mac ip 737 [003] 795.477676: probe:xfrm_dev_event__REGISTER name="macsec0" features=0x1c000080014869 xfrm_dev_event+0x3a notifier_call_chain+0x47 register_netdevice+0x846 macsec_newlink+0x25a ip 737 [003] 795.477687: probe:xfrm_dev_event__return ret=0x8002 (NOTIFY_BAD) notifier_call_chain+0x47 register_netdevice+0x846 macsec_newlink+0x25a dev->features includes NETIF_F_HW_ESP (0x04000000000000), so xfrm_api_check returns NOTIFY_BAD because we don't have dev->xfrmdev_ops on the macsec device. We could probably propagate GSO and a few other features from the lower device, similar to macvlan. This will be done in a future patch. Signed-off-by: Sabrina Dubroca Reviewed-by: Antoine Tenart Reviewed-by: Leon Romanovsky Signed-off-by: David S. Miller --- drivers/net/macsec.c | 27 ++++----------------------- 1 file changed, 4 insertions(+), 23 deletions(-) diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c index c891b60937a7f..b3f76e8071f24 100644 --- a/drivers/net/macsec.c +++ b/drivers/net/macsec.c @@ -2654,11 +2654,6 @@ static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) if (ret) goto rollback; - /* Force features update, since they are different for SW MACSec and - * HW offloading cases. - */ - netdev_update_features(dev); - rtnl_unlock(); return 0; @@ -3432,16 +3427,9 @@ static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, return ret; } -#define SW_MACSEC_FEATURES \ +#define MACSEC_FEATURES \ (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) -/* If h/w offloading is enabled, use real device features save for - * VLAN_FEATURES - they require additional ops - * HW_MACSEC - no reason to report it - */ -#define REAL_DEV_FEATURES(dev) \ - ((dev)->features & ~(NETIF_F_VLAN_FEATURES | NETIF_F_HW_MACSEC)) - static int macsec_dev_init(struct net_device *dev) { struct macsec_dev *macsec = macsec_priv(dev); @@ -3458,12 +3446,8 @@ static int macsec_dev_init(struct net_device *dev) return err; } - if (macsec_is_offloaded(macsec)) { - dev->features = REAL_DEV_FEATURES(real_dev); - } else { - dev->features = real_dev->features & SW_MACSEC_FEATURES; - dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; - } + dev->features = real_dev->features & MACSEC_FEATURES; + dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; dev->needed_headroom = real_dev->needed_headroom + MACSEC_NEEDED_HEADROOM; @@ -3495,10 +3479,7 @@ static netdev_features_t macsec_fix_features(struct net_device *dev, struct macsec_dev *macsec = macsec_priv(dev); struct net_device *real_dev = macsec->real_dev; - if (macsec_is_offloaded(macsec)) - return REAL_DEV_FEATURES(real_dev); - - features &= (real_dev->features & SW_MACSEC_FEATURES) | + features &= (real_dev->features & MACSEC_FEATURES) | NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; features |= NETIF_F_LLTX; -- 2.39.5