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Diffstat (limited to 'src/plugins/af_xdp/input.c')
-rw-r--r--src/plugins/af_xdp/input.c18
1 files changed, 6 insertions, 12 deletions
diff --git a/src/plugins/af_xdp/input.c b/src/plugins/af_xdp/input.c
index 65eee75cb92..da422bdccaf 100644
--- a/src/plugins/af_xdp/input.c
+++ b/src/plugins/af_xdp/input.c
@@ -130,17 +130,11 @@ af_xdp_device_input_refill (vlib_main_t * vm,
/*
* Note about headroom: for some reasons, there seem to be a discrepency
- * between 0-copy and copy mode:
- * - 0-copy: XDP_PACKET_HEADROOM will be added to the user headroom
- * - copy: nothing is added to the user headroom
- * We privileged 0-copy and set headroom to 0. As XDP_PACKET_HEADROOM ==
- * sizeof(vlib_buffer_t), data will correctly point to vlib_buffer_t->data.
- * In copy mode, we have to add sizeof(vlib_buffer_t) to desc offset during
- * refill.
+ * between 0-copy and copy mode. See
+ * src/plugins/af_xdp/device.c:af_xdp_create_queue()
*/
- STATIC_ASSERT (sizeof (vlib_buffer_t) == XDP_PACKET_HEADROOM, "wrong size");
-#define bi2addr(bi) \
- (((bi) << CLIB_LOG2_CACHE_LINE_BYTES) + (copy ? sizeof(vlib_buffer_t) : 0))
+#define bi2addr(bi) \
+ (((bi) << CLIB_LOG2_CACHE_LINE_BYTES) + (copy ? XDP_PACKET_HEADROOM : 0))
wrap_around:
@@ -218,8 +212,8 @@ af_xdp_device_input_bufs (vlib_main_t * vm, const af_xdp_device_t * ad,
const u32 mask = rxq->rx.mask;
u32 n = n_rx, *bi = bis, bytes = 0;
-#define addr2bi(addr) \
- (((addr) - (copy ? sizeof(vlib_buffer_t) : 0)) >> CLIB_LOG2_CACHE_LINE_BYTES)
+#define addr2bi(addr) \
+ (((addr) - (copy ? XDP_PACKET_HEADROOM : 0)) >> CLIB_LOG2_CACHE_LINE_BYTES)
while (n >= 1)
{