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net: group skb_shinfo zerocopy related bits together. 

In preparation for expanded zerocopy (TX and RX), move
the zerocopy related bits out of tx_flags into their own
flag word.

Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jonathan Lemon 2021-01-06 14:18:38 -08:00 committed by Jakub Kicinski
parent 8c793822c5
commit 06b4feb37e
7 changed files with 32 additions and 31 deletions
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3
drivers/net/tap.c
View File

@ -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)->flags |= SKBFL_ZEROCOPY_FRAG;
} else if (msg_control) {
struct ubuf_info *uarg = msg_control;
uarg->callback(NULL, uarg, false);

3
drivers/net/tun.c
View File

@ -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)->flags |= SKBFL_ZEROCOPY_FRAG;
} else if (msg_control) {
struct ubuf_info *uarg = msg_control;
uarg->callback(NULL, uarg, false);

4
drivers/net/xen-netback/interface.c
View File

@ -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 SKBFL_ZEROCOPY_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)->flags |= SKBFL_ZEROCOPY_ENABLE;
atomic_inc(&queue->inflight_packets);
}

38
include/linux/skbuff.h
View File

@ -430,27 +430,31 @@ 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,
};
#define SKBTX_ANY_SW_TSTAMP (SKBTX_SW_TSTAMP | \
SKBTX_SCHED_TSTAMP)
#define SKBTX_ANY_TSTAMP (SKBTX_HW_TSTAMP | SKBTX_ANY_SW_TSTAMP)
/* Definitions for flags in struct skb_shared_info */
enum {
/* use zcopy routines */
SKBFL_ZEROCOPY_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,
SKBFL_SHARED_FRAG = BIT(1),
};
#define SKBTX_ZEROCOPY_FRAG (SKBTX_DEV_ZEROCOPY | SKBTX_SHARED_FRAG)
#define SKBTX_ANY_SW_TSTAMP (SKBTX_SW_TSTAMP | \
SKBTX_SCHED_TSTAMP)
#define SKBTX_ANY_TSTAMP (SKBTX_HW_TSTAMP | SKBTX_ANY_SW_TSTAMP)
#define SKBFL_ZEROCOPY_FRAG (SKBFL_ZEROCOPY_ENABLE | SKBFL_SHARED_FRAG)
/*
* The callback notifies userspace to release buffers when skb DMA is done in
@ -506,7 +510,7 @@ 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 flags;
__u8 meta_len;
__u8 nr_frags;
__u8 tx_flags;
@ -1433,7 +1437,7 @@ 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)->flags & SKBFL_ZEROCOPY_ENABLE;
return is_zcopy ? skb_uarg(skb) : NULL;
}
@ -1452,14 +1456,14 @@ static inline void skb_zcopy_set(struct sk_buff *skb, struct ubuf_info *uarg,
else
skb_zcopy_get(uarg);
skb_shinfo(skb)->destructor_arg = uarg;
skb_shinfo(skb)->tx_flags |= SKBTX_ZEROCOPY_FRAG;
skb_shinfo(skb)->flags |= SKBFL_ZEROCOPY_FRAG;
}
}
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)->flags |= SKBFL_ZEROCOPY_FRAG;
}
static inline bool skb_zcopy_is_nouarg(struct sk_buff *skb)
@ -1497,7 +1501,7 @@ static inline void skb_zcopy_clear(struct sk_buff *skb, bool zerocopy_success)
if (!skb_zcopy_is_nouarg(skb))
uarg->callback(skb, uarg, zerocopy_success);
skb_shinfo(skb)->tx_flags &= ~SKBTX_ZEROCOPY_FRAG;
skb_shinfo(skb)->flags &= ~SKBFL_ZEROCOPY_FRAG;
}
}
@ -3323,7 +3327,7 @@ 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)->flags & SKBFL_SHARED_FRAG;
}
/**

9
net/core/skbuff.c
View File

@ -1327,7 +1327,7 @@ 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 skb with SKBFL_ZEROCOPY_ENABLE.
* It will copy all frags into kernel and drop the reference
* to userspace pages.
*
@ -3264,8 +3264,7 @@ 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)->flags |= skb_shinfo(skb)->flags & SKBFL_SHARED_FRAG;
skb_zerocopy_clone(skb1, skb, 0);
if (len < pos) /* Split line is inside header. */
skb_split_inside_header(skb, skb1, len, pos);
@ -3954,8 +3953,8 @@ 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)->flags |= skb_shinfo(head_skb)->flags &
SKBFL_SHARED_FRAG;
if (skb_orphan_frags(frag_skb, GFP_ATOMIC) ||
skb_zerocopy_clone(nskb, frag_skb, GFP_ATOMIC))

2
net/ipv4/tcp.c
View File

@ -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)->flags |= SKBFL_SHARED_FRAG;
skb->len += copy;
skb->data_len += copy;

4
net/kcm/kcmsock.c
View File

@ -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)->flags |= SKBFL_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)->flags |= SKBFL_SHARED_FRAG;
coalesced:
skb->len += size;