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authorBjörn Töpel <bjorn.topel@intel.com>2018-08-30 15:12:48 +0200
committerDaniel Borkmann <daniel@iogearbox.net>2018-08-30 15:25:40 +0200
commit18baed2684b02f752b5d800bb113e99730e1d24b (patch)
treea7573a7bc65269404e8aa2b13cc7c9d40b1bba45 /net/xdp/xsk.c
parent56b48c6a6008d9d5d023b7dd002913c8715dc3a0 (diff)
downloadblackbird-obmc-linux-18baed2684b02f752b5d800bb113e99730e1d24b.tar.gz
blackbird-obmc-linux-18baed2684b02f752b5d800bb113e99730e1d24b.zip
xsk: include XDP meta data in AF_XDP frames
Previously, the AF_XDP (XDP_DRV/XDP_SKB copy-mode) ingress logic did not include XDP meta data in the data buffers copied out to the user application. In this commit, we check if meta data is available, and if so, it is prepended to the frame. Signed-off-by: Björn Töpel <bjorn.topel@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'net/xdp/xsk.c')
-rw-r--r--net/xdp/xsk.c24
1 files changed, 18 insertions, 6 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 4e937cd7c17d..569048e299df 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -55,20 +55,30 @@ EXPORT_SYMBOL(xsk_umem_discard_addr);
static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
{
- void *buffer;
+ void *to_buf, *from_buf;
+ u32 metalen;
u64 addr;
int err;
if (!xskq_peek_addr(xs->umem->fq, &addr) ||
- len > xs->umem->chunk_size_nohr) {
+ len > xs->umem->chunk_size_nohr - XDP_PACKET_HEADROOM) {
xs->rx_dropped++;
return -ENOSPC;
}
addr += xs->umem->headroom;
- buffer = xdp_umem_get_data(xs->umem, addr);
- memcpy(buffer, xdp->data, len);
+ if (unlikely(xdp_data_meta_unsupported(xdp))) {
+ from_buf = xdp->data;
+ metalen = 0;
+ } else {
+ from_buf = xdp->data_meta;
+ metalen = xdp->data - xdp->data_meta;
+ }
+
+ to_buf = xdp_umem_get_data(xs->umem, addr);
+ memcpy(to_buf, from_buf, len + metalen);
+ addr += metalen;
err = xskq_produce_batch_desc(xs->rx, addr, len);
if (!err) {
xskq_discard_addr(xs->umem->fq);
@@ -111,6 +121,7 @@ void xsk_flush(struct xdp_sock *xs)
int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
{
+ u32 metalen = xdp->data - xdp->data_meta;
u32 len = xdp->data_end - xdp->data;
void *buffer;
u64 addr;
@@ -120,7 +131,7 @@ int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
return -EINVAL;
if (!xskq_peek_addr(xs->umem->fq, &addr) ||
- len > xs->umem->chunk_size_nohr) {
+ len > xs->umem->chunk_size_nohr - XDP_PACKET_HEADROOM) {
xs->rx_dropped++;
return -ENOSPC;
}
@@ -128,7 +139,8 @@ int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
addr += xs->umem->headroom;
buffer = xdp_umem_get_data(xs->umem, addr);
- memcpy(buffer, xdp->data, len);
+ memcpy(buffer, xdp->data_meta, len + metalen);
+ addr += metalen;
err = xskq_produce_batch_desc(xs->rx, addr, len);
if (!err) {
xskq_discard_addr(xs->umem->fq);
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