linux-kernel - [RFC net-next io_uring 06/11] net: add flags for controlling ubuf

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Date:   Wed, 10 Aug 2022 16:49:14 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     io-uring@...r.kernel.org, netdev@...r.kernel.org
Cc:     Jens Axboe <axboe@...nel.dk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, kernel-team@...com,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        Wei Liu <wei.liu@...nel.org>, Paul Durrant <paul@....org>,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Pavel Begunkov <asml.silence@...il.com>
Subject: [RFC net-next io_uring 06/11] net: add flags for controlling ubuf_info

There are already skb_flags in ubuf_info, which enhancing skbs. Also add
flags controlling ubuf_info, mainly to hint about various referencing
aspects of it, which will be introduced in later patches.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 include/linux/skbuff.h | 1 +
 io_uring/notif.c       | 1 +
 net/core/skbuff.c      | 1 +
 3 files changed, 3 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index e749b5d3868d..2b2e0020030b 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -535,6 +535,7 @@ struct ubuf_info {
 			 bool zerocopy_success);
 	refcount_t refcnt;
 	u8 skb_flags;
+	u8 flags;
 };
 
 struct ubuf_info_msgzc {
diff --git a/io_uring/notif.c b/io_uring/notif.c
index 97cb4a7e8849..a2ba1e35a59f 100644
--- a/io_uring/notif.c
+++ b/io_uring/notif.c
@@ -66,6 +66,7 @@ struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx,
 	nd = io_notif_to_data(notif);
 	nd->account_pages = 0;
 	nd->uarg.skb_flags = SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN;
+	nd->uarg.flags = 0;
 	nd->uarg.callback = io_uring_tx_zerocopy_callback;
 	/* master ref owned by io_notif_slot, will be dropped on flush */
 	refcount_set(&nd->uarg.refcnt, 1);
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 40bb84986800..7e102373482c 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1207,6 +1207,7 @@ static struct ubuf_info *msg_zerocopy_alloc(struct sock *sk, size_t size)
 	uarg->bytelen = size;
 	uarg->zerocopy = 1;
 	uarg->ubuf.skb_flags = SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN;
+	uarg->ubuf.flags = 0;
 	refcount_set(&uarg->ubuf.refcnt, 1);
 	sock_hold(sk);
 
-- 
2.37.0