netdev - [RFC PATCH v2 14/21] net/tcp: add netgpu ioctl setting up zero copy RX queues

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Message-ID: <20200727224444.2987641-15-jonathan.lemon@gmail.com>
Date:   Mon, 27 Jul 2020 15:44:37 -0700
From:   Jonathan Lemon <jonathan.lemon@...il.com>
To:     <netdev@...r.kernel.org>
CC:     <kernel-team@...com>
Subject: [RFC PATCH v2 14/21] net/tcp: add netgpu ioctl setting up zero copy RX queues

From: Jonathan Lemon <bsd@...com>

Netgpu delivers iovecs to userspace for incoming data, but the
destination queue must be attached to the socket.  Do this via
and ioctl call on the socket itself.

Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>
---
 net/ipv4/tcp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 27de9380ed14..261c28ccc8f6 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -279,6 +279,7 @@
 #include <linux/uaccess.h>
 #include <asm/ioctls.h>
 #include <net/busy_poll.h>
+#include <net/netgpu.h>
 
 struct percpu_counter tcp_orphan_count;
 EXPORT_SYMBOL_GPL(tcp_orphan_count);
@@ -636,6 +637,10 @@ int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg)
 			answ = READ_ONCE(tp->write_seq) -
 			       READ_ONCE(tp->snd_nxt);
 		break;
+#if IS_ENABLED(CONFIG_NETGPU)
+	case NETGPU_SOCK_IOCTL_ATTACH_QUEUES:	/* SIOCPROTOPRIVATE */
+		return netgpu_attach_socket(sk, (void __user *)arg);
+#endif
 	default:
 		return -ENOIOCTLCMD;
 	}
-- 
2.24.1