From 42b33468987bac0dd95c30f14820c7abac04a153 Mon Sep 17 00:00:00 2001 From: Jesper Dangaard Brouer Date: Thu, 31 May 2018 10:59:47 +0200 Subject: xdp: add flags argument to ndo_xdp_xmit API This patch only change the API and reject any use of flags. This is an intermediate step that allows us to implement the flush flag operation later, for each individual driver in a separate patch. The plan is to implement flush operation via XDP_XMIT_FLUSH flag and then remove XDP_XMIT_FLAGS_NONE when done. Signed-off-by: Jesper Dangaard Brouer Acked-by: Song Liu Signed-off-by: Alexei Starovoitov --- kernel/bpf/devmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'kernel/bpf/devmap.c') diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index 1fe3fe60508a..037e234056f7 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -232,7 +232,7 @@ static int bq_xmit_all(struct bpf_dtab_netdev *obj, prefetch(xdpf); } - sent = dev->netdev_ops->ndo_xdp_xmit(dev, bq->count, bq->q); + sent = dev->netdev_ops->ndo_xdp_xmit(dev, bq->count, bq->q, 0); if (sent < 0) { err = sent; sent = 0; -- cgit v1.2.3 From c1ece6b245bd12a57124da78abafbf8a511394d6 Mon Sep 17 00:00:00 2001 From: Jesper Dangaard Brouer Date: Thu, 31 May 2018 11:00:23 +0200 Subject: bpf/xdp: devmap can avoid calling ndo_xdp_flush The XDP_REDIRECT map devmap can avoid using ndo_xdp_flush, by instead instructing ndo_xdp_xmit to flush via XDP_XMIT_FLUSH flag in appropriate places. Notice after this patch it is possible to remove ndo_xdp_flush completely, as this is the last user of ndo_xdp_flush. This is left for later patches, to keep driver changes separate. Signed-off-by: Jesper Dangaard Brouer Acked-by: Song Liu Signed-off-by: Alexei Starovoitov --- kernel/bpf/devmap.c | 19 ++++++------------- 1 file changed, 6 insertions(+), 13 deletions(-) (limited to 'kernel/bpf/devmap.c') diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index 037e234056f7..a7cc7b3494a9 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -217,7 +217,7 @@ void __dev_map_insert_ctx(struct bpf_map *map, u32 bit) } static int bq_xmit_all(struct bpf_dtab_netdev *obj, - struct xdp_bulk_queue *bq) + struct xdp_bulk_queue *bq, u32 flags) { struct net_device *dev = obj->dev; int sent = 0, drops = 0, err = 0; @@ -232,7 +232,7 @@ static int bq_xmit_all(struct bpf_dtab_netdev *obj, prefetch(xdpf); } - sent = dev->netdev_ops->ndo_xdp_xmit(dev, bq->count, bq->q, 0); + sent = dev->netdev_ops->ndo_xdp_xmit(dev, bq->count, bq->q, flags); if (sent < 0) { err = sent; sent = 0; @@ -276,7 +276,6 @@ void __dev_map_flush(struct bpf_map *map) for_each_set_bit(bit, bitmap, map->max_entries) { struct bpf_dtab_netdev *dev = READ_ONCE(dtab->netdev_map[bit]); struct xdp_bulk_queue *bq; - struct net_device *netdev; /* This is possible if the dev entry is removed by user space * between xdp redirect and flush op. @@ -287,10 +286,7 @@ void __dev_map_flush(struct bpf_map *map) __clear_bit(bit, bitmap); bq = this_cpu_ptr(dev->bulkq); - bq_xmit_all(dev, bq); - netdev = dev->dev; - if (likely(netdev->netdev_ops->ndo_xdp_flush)) - netdev->netdev_ops->ndo_xdp_flush(netdev); + bq_xmit_all(dev, bq, XDP_XMIT_FLUSH); } } @@ -320,7 +316,7 @@ static int bq_enqueue(struct bpf_dtab_netdev *obj, struct xdp_frame *xdpf, struct xdp_bulk_queue *bq = this_cpu_ptr(obj->bulkq); if (unlikely(bq->count == DEV_MAP_BULK_SIZE)) - bq_xmit_all(obj, bq); + bq_xmit_all(obj, bq, 0); /* Ingress dev_rx will be the same for all xdp_frame's in * bulk_queue, because bq stored per-CPU and must be flushed @@ -359,8 +355,7 @@ static void *dev_map_lookup_elem(struct bpf_map *map, void *key) static void dev_map_flush_old(struct bpf_dtab_netdev *dev) { - if (dev->dev->netdev_ops->ndo_xdp_flush) { - struct net_device *fl = dev->dev; + if (dev->dev->netdev_ops->ndo_xdp_xmit) { struct xdp_bulk_queue *bq; unsigned long *bitmap; @@ -371,9 +366,7 @@ static void dev_map_flush_old(struct bpf_dtab_netdev *dev) __clear_bit(dev->bit, bitmap); bq = per_cpu_ptr(dev->bulkq, cpu); - bq_xmit_all(dev, bq); - - fl->netdev_ops->ndo_xdp_flush(dev->dev); + bq_xmit_all(dev, bq, XDP_XMIT_FLUSH); } } } -- cgit v1.2.3