From: Stephen Hemminger <stephen@networkplumber.org>
To: Arjun Roy <arjunroy.kdev@gmail.com>
Cc: davem@davemloft.net, netdev@vger.kernel.org, arjunroy@google.com,
edumazet@google.com, soheil@google.com
Subject: Re: [net-next v2 1/8] net-zerocopy: Copy straggler unaligned data for TCP Rx. zerocopy.
Date: Wed, 2 Dec 2020 16:15:27 -0800 [thread overview]
Message-ID: <20201202161527.51fcdcd7@hermes.local> (raw)
In-Reply-To: <20201202220945.911116-2-arjunroy.kdev@gmail.com>
On Wed, 2 Dec 2020 14:09:38 -0800
Arjun Roy <arjunroy.kdev@gmail.com> wrote:
> diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
> index cfcb10b75483..62db78b9c1a0 100644
> --- a/include/uapi/linux/tcp.h
> +++ b/include/uapi/linux/tcp.h
> @@ -349,5 +349,7 @@ struct tcp_zerocopy_receive {
> __u32 recv_skip_hint; /* out: amount of bytes to skip */
> __u32 inq; /* out: amount of bytes in read queue */
> __s32 err; /* out: socket error */
> + __u64 copybuf_address; /* in: copybuf address (small reads) */
> + __s32 copybuf_len; /* in/out: copybuf bytes avail/used or error */
> };
> #endif /* _UAPI_LINUX_TCP_H */
You can't safely grow the size of a userspace API without handling the
case of older applications. Logic in setsockopt() would have to handle
both old and new sizes of the structure.
next prev parent reply other threads:[~2020-12-03 0:16 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-02 22:09 [net-next v2 0/8] Perf. optimizations for TCP Recv. Zerocopy Arjun Roy
2020-12-02 22:09 ` [net-next v2 1/8] net-zerocopy: Copy straggler unaligned data for TCP Rx. zerocopy Arjun Roy
2020-12-03 0:15 ` Stephen Hemminger [this message]
2020-12-03 0:24 ` Arjun Roy
2020-12-03 23:01 ` David Laight
2020-12-03 23:14 ` Eric Dumazet
2020-12-04 9:02 ` David Laight
2020-12-03 23:19 ` Arjun Roy
2020-12-03 23:24 ` Arjun Roy
2020-12-04 9:03 ` David Laight
2020-12-04 22:37 ` Arjun Roy
2020-12-02 22:09 ` [net-next v2 2/8] net-tcp: Introduce tcp_recvmsg_locked() Arjun Roy
2020-12-02 22:09 ` [net-next v2 3/8] net-zerocopy: Refactor skb frag fast-forward op Arjun Roy
2020-12-02 22:09 ` [net-next v2 4/8] net-zerocopy: Refactor frag-is-remappable test Arjun Roy
2020-12-02 22:09 ` [net-next v2 5/8] net-zerocopy: Fast return if inq < PAGE_SIZE Arjun Roy
2020-12-02 22:09 ` [net-next v2 6/8] net-zerocopy: Introduce short-circuit small reads Arjun Roy
2020-12-02 22:09 ` [net-next v2 7/8] net-zerocopy: Set zerocopy hint when data is copied Arjun Roy
2020-12-02 22:09 ` [net-next v2 8/8] net-zerocopy: Defer vm zap unless actually needed Arjun Roy
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