Re: [PATCH v1 net-next 01/15] iov_iter: Skip copy in memcpy_to_page if src==dst

On 08/12/2020 2:39, David Ahern wrote: > On 12/7/20 2:06 PM, Boris Pismenny wrote: >> When using direct data placement the NIC writes some of the payload >> directly to the destination buffer, and constructs the SKB such that it >> points to this data. As a result, the skb_copy datagram_iter call

Re: [PATCH v1 net-next 01/15] iov_iter: Skip copy in memcpy_to_page if src==dst

On 12/7/20 2:06 PM, Boris Pismenny wrote: > When using direct data placement the NIC writes some of the payload > directly to the destination buffer, and constructs the SKB such that it > points to this data. As a result, the skb_copy datagram_iter call will > attempt to copy data when it is not ne

[PATCH v1 net-next 01/15] iov_iter: Skip copy in memcpy_to_page if src==dst

When using direct data placement the NIC writes some of the payload directly to the destination buffer, and constructs the SKB such that it points to this data. As a result, the skb_copy datagram_iter call will attempt to copy data when it is not necessary. This patch adds a check to avoid this co