@@ -64,6 +64,8 @@ struct xdp_mmap_offsets {
#define XDP_STATISTICS 7
#define XDP_OPTIONS 8
+#define XDP_RXTX_RING_MIN_ENTRIES 1024
+
struct xdp_umem_reg {
__u64 addr; /* Start of packet data area */
__u64 len; /* Length of packet data area */
@@ -831,6 +831,8 @@ static int xsk_setsockopt(struct socket *sock, int level, int optname,
return -EINVAL;
if (copy_from_sockptr(&entries, optval, sizeof(entries)))
return -EFAULT;
+ if (entries < XDP_RXTX_RING_MIN_ENTRIES)
+ return -EINVAL;
mutex_lock(&xs->mutex);
if (xs->state != XSK_READY) {
We expect tx entries to be greater than twice the number of packets that the network card can send at a time, so that when the remaining number of the tx queue is less than half of the queue, it can be guaranteed that there are recycled items in the cq that can be used. At the same time, rx will not cause packet loss because it cannot receive the packets uploaded by the network card at one time. Of course, the 1024 here is only an estimated value, and the number of packets sent by each network card at a time may be different. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- include/uapi/linux/if_xdp.h | 2 ++ net/xdp/xsk.c | 2 ++ 2 files changed, 4 insertions(+)