From: Jonathan Lemon <jonathan.lemon@gmail.com>
To: <netdev@vger.kernel.org>
Cc: <kernel-team@fb.com>
Subject: [RFC PATCH v2 15/21] net/tcp: add MSG_NETDMA flag for sendmsg()
Date: Mon, 27 Jul 2020 15:44:38 -0700 [thread overview]
Message-ID: <20200727224444.2987641-16-jonathan.lemon@gmail.com> (raw)
In-Reply-To: <20200727224444.2987641-1-jonathan.lemon@gmail.com>
This flag indicates that the attached data is a zero-copy send,
and the pages should be retrieved from the netgpu module. The
socket should should already have been attached to a netgpu queue.
Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com>
---
include/linux/socket.h | 1 +
net/ipv4/tcp.c | 8 ++++++++
2 files changed, 9 insertions(+)
diff --git a/include/linux/socket.h b/include/linux/socket.h
index 04d2bc97f497..63816cc25dee 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -310,6 +310,7 @@ struct ucred {
*/
#define MSG_ZEROCOPY 0x4000000 /* Use user data in kernel path */
+#define MSG_NETDMA 0x8000000
#define MSG_FASTOPEN 0x20000000 /* Send data in TCP SYN */
#define MSG_CMSG_CLOEXEC 0x40000000 /* Set close_on_exec for file
descriptor received through
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 261c28ccc8f6..340ce319edc9 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1214,6 +1214,14 @@ int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size)
uarg->zerocopy = 0;
}
+ if (flags & MSG_NETDMA && size && sock_flag(sk, SOCK_ZEROCOPY)) {
+ zc = sk->sk_route_caps & NETIF_F_SG;
+ if (!zc) {
+ err = -EFAULT;
+ goto out_err;
+ }
+ }
+
if (unlikely(flags & MSG_FASTOPEN || inet_sk(sk)->defer_connect) &&
!tp->repair) {
err = tcp_sendmsg_fastopen(sk, msg, &copied_syn, size, uarg);
--
2.24.1
next prev parent reply other threads:[~2020-07-27 22:45 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-27 22:44 [RFC PATCH v2 00/21] netgpu: networking between NIC and GPU/CPU Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 01/21] linux/log2.h: enclose macro arg in parens Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 02/21] mm/memory_hotplug: add {add|release}_memory_pages Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 03/21] mm: Allow DMA mapping of pages which are not online Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 04/21] kernel/user: export free_uid Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 05/21] uapi/misc: add shqueue.h for shared queues Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 06/21] include: add netgpu UAPI and kernel definitions Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 07/21] netdevice: add SETUP_NETGPU to the netdev_bpf structure Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 08/21] skbuff: add a zc_netgpu bitflag Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 09/21] core/skbuff: use skb_zdata for testing whether skb is zerocopy Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 10/21] netgpu: add network/gpu/host dma module Jonathan Lemon
2020-07-28 16:26 ` Greg KH
2020-07-28 17:41 ` Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 11/21] core/skbuff: add page recycling logic for netgpu pages Jonathan Lemon
2020-07-28 16:28 ` Greg KH
2020-07-28 18:00 ` Jonathan Lemon
2020-07-28 18:26 ` Greg KH
2020-07-27 22:44 ` [RFC PATCH v2 12/21] lib: have __zerocopy_sg_from_iter get netgpu pages for a sk Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 13/21] net/tcp: Pad TCP options out to a fixed size for netgpu Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 14/21] net/tcp: add netgpu ioctl setting up zero copy RX queues Jonathan Lemon
2020-07-28 2:16 ` Jonathan Lemon
2020-07-27 22:44 ` Jonathan Lemon [this message]
2020-07-27 22:44 ` [RFC PATCH v2 16/21] mlx5: remove the umem parameter from mlx5e_open_channel Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 17/21] mlx5e: add header split ability Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 18/21] mlx5e: add netgpu entries to mlx5 structures Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 19/21] mlx5e: add the netgpu driver functions Jonathan Lemon
2020-07-28 16:27 ` Greg KH
2020-07-27 22:44 ` [RFC PATCH v2 20/21] mlx5e: hook up the netgpu functions Jonathan Lemon
2020-07-27 22:44 ` [RFC PATCH v2 21/21] netgpu/nvidia: add Nvidia plugin for netgpu Jonathan Lemon
2020-07-28 16:31 ` Greg KH
2020-07-28 17:18 ` Chris Mason
2020-07-28 17:27 ` Christoph Hellwig
2020-07-28 18:47 ` Chris Mason
2020-07-28 19:55 ` [RFC PATCH v2 00/21] netgpu: networking between NIC and GPU/CPU Stephen Hemminger
2020-07-28 20:43 ` Jonathan Lemon
[not found] <20200727052846.4070247-1-jonathan.lemon@gmail.com>
[not found] ` <20200727052846.4070247-16-jonathan.lemon@gmail.com>
2020-07-27 15:19 ` [RFC PATCH v2 15/21] net/tcp: add MSG_NETDMA flag for sendmsg() Eric Dumazet
2020-07-27 15:55 ` Jonathan Lemon
2020-07-27 16:09 ` Eric Dumazet
2020-07-27 17:35 ` Jonathan Lemon
2020-07-27 17:44 ` Eric Dumazet
2020-07-28 2:11 ` Jonathan Lemon
2020-07-28 2:17 ` Eric Dumazet
2020-07-28 3:08 ` Jonathan Lemon
2020-07-28 6:50 ` Christoph Hellwig
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