On Thu, 2024-05-30 at 20:16 +, Mina Almasry wrote:
> @@ -2317,6 +2318,213 @@ static int tcp_inq_hint(struct sock *sk)
> return inq;
> }
>
> +/* batch __xa_alloc() calls and reduce xa_lock()/xa_unlock() overhead. */
> +struct tcp_xa_pool {
> + u8 max; /* max <= MAX_SKB_
In tcp_recvmsg_locked(), detect if the skb being received by the user
is a devmem skb. In this case - if the user provided the MSG_SOCK_DEVMEM
flag - pass it to tcp_recvmsg_devmem() for custom handling.
tcp_recvmsg_devmem() copies any data in the skb header to the linear
buffer, and returns a cmsg
