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Message-ID: <20201218201633.2735367-2-jonathan.lemon@gmail.com>
Date: Fri, 18 Dec 2020 12:16:25 -0800
From: Jonathan Lemon <jonathan.lemon@...il.com>
To: <netdev@...r.kernel.org>, <edumazet@...gle.com>,
<willemdebruijn.kernel@...il.com>
CC: <kernel-team@...com>
Subject: [PATCH 1/9 v1 RFC] net: group skb_shinfo zerocopy related bits together.
From: Jonathan Lemon <bsd@...com>
In preparation for expanded zerocopy (TX and RX), move
the ZC related bits out of tx_flags into their own flag
word.
Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>
---
drivers/net/tap.c | 3 +--
drivers/net/tun.c | 3 +--
drivers/net/xen-netback/interface.c | 4 ++--
include/linux/skbuff.h | 33 ++++++++++++++++-------------
net/core/skbuff.c | 10 ++++-----
net/ipv4/tcp.c | 2 +-
net/kcm/kcmsock.c | 4 ++--
7 files changed, 30 insertions(+), 29 deletions(-)
diff --git a/drivers/net/tap.c b/drivers/net/tap.c
index 1f4bdd94407a..3e9fb753ce88 100644
--- a/drivers/net/tap.c
+++ b/drivers/net/tap.c
@@ -723,8 +723,7 @@ static ssize_t tap_get_user(struct tap_queue *q, void *msg_control,
/* copy skb_ubuf_info for callback when skb has no error */
if (zerocopy) {
skb_shinfo(skb)->destructor_arg = msg_control;
- skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
- skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
+ skb_shinfo(skb)->zc_flags |= SKBZC_FRAGMENTS;
} else if (msg_control) {
struct ubuf_info *uarg = msg_control;
uarg->callback(uarg, false);
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index fbed05ae7b0f..80cb3bef3afd 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1815,8 +1815,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
/* copy skb_ubuf_info for callback when skb has no error */
if (zerocopy) {
skb_shinfo(skb)->destructor_arg = msg_control;
- skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
- skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
+ skb_shinfo(skb)->zc_flags |= SKBZC_FRAGMENTS;
} else if (msg_control) {
struct ubuf_info *uarg = msg_control;
uarg->callback(uarg, false);
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index acb786d8b1d8..ec790df75be3 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -47,7 +47,7 @@
/* Number of bytes allowed on the internal guest Rx queue. */
#define XENVIF_RX_QUEUE_BYTES (XEN_NETIF_RX_RING_SIZE/2 * PAGE_SIZE)
-/* This function is used to set SKBTX_DEV_ZEROCOPY as well as
+/* This function is used to set SKBZC_ENABLE as well as
* increasing the inflight counter. We need to increase the inflight
* counter because core driver calls into xenvif_zerocopy_callback
* which calls xenvif_skb_zerocopy_complete.
@@ -55,7 +55,7 @@
void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue,
struct sk_buff *skb)
{
- skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
+ skb_shinfo(skb)->zc_flags |= SKBZC_ENABLE;
atomic_inc(&queue->inflight_packets);
}
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 333bcdc39635..69588b304f83 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -430,24 +430,27 @@ enum {
/* device driver is going to provide hardware time stamp */
SKBTX_IN_PROGRESS = 1 << 2,
- /* device driver supports TX zero-copy buffers */
- SKBTX_DEV_ZEROCOPY = 1 << 3,
-
/* generate wifi status information (where possible) */
SKBTX_WIFI_STATUS = 1 << 4,
+ /* generate software time stamp when entering packet scheduling */
+ SKBTX_SCHED_TSTAMP = 1 << 6,
+};
+
+/* Definitions for zc_flags in struct skb_shared_info */
+enum {
+ /* use zcopy routines */
+ SKBZC_ENABLE = BIT(0),
+
/* This indicates at least one fragment might be overwritten
* (as in vmsplice(), sendfile() ...)
* If we need to compute a TX checksum, we'll need to copy
* all frags to avoid possible bad checksum
*/
- SKBTX_SHARED_FRAG = 1 << 5,
-
- /* generate software time stamp when entering packet scheduling */
- SKBTX_SCHED_TSTAMP = 1 << 6,
+ SKBZC_SHARED_FRAG = BIT(1),
};
-#define SKBTX_ZEROCOPY_FRAG (SKBTX_DEV_ZEROCOPY | SKBTX_SHARED_FRAG)
+#define SKBZC_FRAGMENTS (SKBZC_ENABLE | SKBZC_SHARED_FRAG)
#define SKBTX_ANY_SW_TSTAMP (SKBTX_SW_TSTAMP | \
SKBTX_SCHED_TSTAMP)
#define SKBTX_ANY_TSTAMP (SKBTX_HW_TSTAMP | SKBTX_ANY_SW_TSTAMP)
@@ -510,7 +513,7 @@ int skb_zerocopy_iter_stream(struct sock *sk, struct sk_buff *skb,
* the end of the header data, ie. at skb->end.
*/
struct skb_shared_info {
- __u8 __unused;
+ __u8 zc_flags;
__u8 meta_len;
__u8 nr_frags;
__u8 tx_flags;
@@ -1437,7 +1440,7 @@ static inline struct skb_shared_hwtstamps *skb_hwtstamps(struct sk_buff *skb)
static inline struct ubuf_info *skb_zcopy(struct sk_buff *skb)
{
- bool is_zcopy = skb && skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY;
+ bool is_zcopy = skb && skb_shinfo(skb)->zc_flags & SKBZC_ENABLE;
return is_zcopy ? skb_uarg(skb) : NULL;
}
@@ -1451,14 +1454,14 @@ static inline void skb_zcopy_set(struct sk_buff *skb, struct ubuf_info *uarg,
else
sock_zerocopy_get(uarg);
skb_shinfo(skb)->destructor_arg = uarg;
- skb_shinfo(skb)->tx_flags |= SKBTX_ZEROCOPY_FRAG;
+ skb_shinfo(skb)->zc_flags |= SKBZC_FRAGMENTS;
}
}
static inline void skb_zcopy_set_nouarg(struct sk_buff *skb, void *val)
{
skb_shinfo(skb)->destructor_arg = (void *)((uintptr_t) val | 0x1UL);
- skb_shinfo(skb)->tx_flags |= SKBTX_ZEROCOPY_FRAG;
+ skb_shinfo(skb)->zc_flags |= SKBZC_FRAGMENTS;
}
static inline bool skb_zcopy_is_nouarg(struct sk_buff *skb)
@@ -1486,7 +1489,7 @@ static inline void skb_zcopy_clear(struct sk_buff *skb, bool zerocopy)
uarg->callback(uarg, zerocopy);
}
- skb_shinfo(skb)->tx_flags &= ~SKBTX_ZEROCOPY_FRAG;
+ skb_shinfo(skb)->zc_flags &= ~SKBZC_FRAGMENTS;
}
}
@@ -1497,7 +1500,7 @@ static inline void skb_zcopy_abort(struct sk_buff *skb)
if (uarg) {
sock_zerocopy_put_abort(uarg, false);
- skb_shinfo(skb)->tx_flags &= ~SKBTX_ZEROCOPY_FRAG;
+ skb_shinfo(skb)->zc_flags &= ~SKBZC_FRAGMENTS;
}
}
@@ -3323,7 +3326,7 @@ static inline int skb_linearize(struct sk_buff *skb)
static inline bool skb_has_shared_frag(const struct sk_buff *skb)
{
return skb_is_nonlinear(skb) &&
- skb_shinfo(skb)->tx_flags & SKBTX_SHARED_FRAG;
+ skb_shinfo(skb)->zc_flags & SKBZC_SHARED_FRAG;
}
/**
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index f62cae3f75d8..327ee8938f78 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1330,7 +1330,7 @@ static int skb_zerocopy_clone(struct sk_buff *nskb, struct sk_buff *orig,
* @skb: the skb to modify
* @gfp_mask: allocation priority
*
- * This must be called on SKBTX_DEV_ZEROCOPY skb.
+ * This must be called on SKBZC_ENABLE skb.
* It will copy all frags into kernel and drop the reference
* to userspace pages.
*
@@ -3267,8 +3267,8 @@ void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len)
{
int pos = skb_headlen(skb);
- skb_shinfo(skb1)->tx_flags |= skb_shinfo(skb)->tx_flags &
- SKBTX_SHARED_FRAG;
+ skb_shinfo(skb1)->zc_flags |= skb_shinfo(skb)->zc_flags &
+ SKBZC_SHARED_FRAG;
skb_zerocopy_clone(skb1, skb, 0);
if (len < pos) /* Split line is inside header. */
skb_split_inside_header(skb, skb1, len, pos);
@@ -3957,8 +3957,8 @@ struct sk_buff *skb_segment(struct sk_buff *head_skb,
skb_copy_from_linear_data_offset(head_skb, offset,
skb_put(nskb, hsize), hsize);
- skb_shinfo(nskb)->tx_flags |= skb_shinfo(head_skb)->tx_flags &
- SKBTX_SHARED_FRAG;
+ skb_shinfo(nskb)->zc_flags |= skb_shinfo(head_skb)->zc_flags &
+ SKBZC_SHARED_FRAG;
if (skb_orphan_frags(frag_skb, GFP_ATOMIC) ||
skb_zerocopy_clone(nskb, frag_skb, GFP_ATOMIC))
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index ed42d2193c5c..fea9bae370e4 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1010,7 +1010,7 @@ struct sk_buff *tcp_build_frag(struct sock *sk, int size_goal, int flags,
}
if (!(flags & MSG_NO_SHARED_FRAGS))
- skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
+ skb_shinfo(skb)->zc_flags |= SKBZC_SHARED_FRAG;
skb->len += copy;
skb->data_len += copy;
diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c
index 56dad9565bc9..55c04d8c659a 100644
--- a/net/kcm/kcmsock.c
+++ b/net/kcm/kcmsock.c
@@ -786,7 +786,7 @@ static ssize_t kcm_sendpage(struct socket *sock, struct page *page,
if (skb_can_coalesce(skb, i, page, offset)) {
skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], size);
- skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
+ skb_shinfo(skb)->zc_flags |= SKBZC_SHARED_FRAG;
goto coalesced;
}
@@ -834,7 +834,7 @@ static ssize_t kcm_sendpage(struct socket *sock, struct page *page,
get_page(page);
skb_fill_page_desc(skb, i, page, offset, size);
- skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
+ skb_shinfo(skb)->zc_flags |= SKBZC_SHARED_FRAG;
coalesced:
skb->len += size;
--
2.24.1
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