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sock: make static tls function alloc_sg generic sock helper 

The TLS ULP module builds scatterlists from a sock using
page_frag_refill(). This is going to be useful for other ULPs
so move it into sock file for more general use.

In the process remove useless goto at end of while loop.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
John Fastabend 2018-03-18 12:56:49 -07:00 committed by Daniel Borkmann
parent 318df9f01c
commit 2c3682f0be
3 changed files with 67 additions and 62 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/sock.h
View File

@ -2141,6 +2141,10 @@ static inline struct page_frag *sk_page_frag(struct sock *sk)
bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag);
int sk_alloc_sg(struct sock *sk, int len, struct scatterlist *sg,
int *sg_num_elem, unsigned int *sg_size,
int first_coalesce);
/*
* Default write policy as shown to user space via poll/select/SIGIO
*/

56
net/core/sock.c
View File

@ -2239,6 +2239,62 @@ bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
}
EXPORT_SYMBOL(sk_page_frag_refill);
int sk_alloc_sg(struct sock *sk, int len, struct scatterlist *sg,
int *sg_num_elem, unsigned int *sg_size,
int first_coalesce)
{
struct page_frag *pfrag;
unsigned int size = *sg_size;
int num_elem = *sg_num_elem, use = 0, rc = 0;
struct scatterlist *sge;
unsigned int orig_offset;
len -= size;
pfrag = sk_page_frag(sk);
while (len > 0) {
if (!sk_page_frag_refill(sk, pfrag)) {
rc = -ENOMEM;
goto out;
}
use = min_t(int, len, pfrag->size - pfrag->offset);
if (!sk_wmem_schedule(sk, use)) {
rc = -ENOMEM;
goto out;
}
sk_mem_charge(sk, use);
size += use;
orig_offset = pfrag->offset;
pfrag->offset += use;
sge = sg + num_elem - 1;
if (num_elem > first_coalesce && sg_page(sg) == pfrag->page &&
sg->offset + sg->length == orig_offset) {
sg->length += use;
} else {
sge++;
sg_unmark_end(sge);
sg_set_page(sge, pfrag->page, use, orig_offset);
get_page(pfrag->page);
++num_elem;
if (num_elem == MAX_SKB_FRAGS) {
rc = -ENOSPC;
break;
}
}
len -= use;
}
out:
*sg_size = size;
*sg_num_elem = num_elem;
return rc;
}
EXPORT_SYMBOL(sk_alloc_sg);
static void __lock_sock(struct sock *sk)
__releases(&sk->sk_lock.slock)
__acquires(&sk->sk_lock.slock)

69
net/tls/tls_sw.c
View File

@ -87,71 +87,16 @@ static void trim_both_sgl(struct sock *sk, int target_size)
target_size);
}
static int alloc_sg(struct sock *sk, int len, struct scatterlist *sg,
int *sg_num_elem, unsigned int *sg_size,
int first_coalesce)
{
struct page_frag *pfrag;
unsigned int size = *sg_size;
int num_elem = *sg_num_elem, use = 0, rc = 0;
struct scatterlist *sge;
unsigned int orig_offset;
len -= size;
pfrag = sk_page_frag(sk);
while (len > 0) {
if (!sk_page_frag_refill(sk, pfrag)) {
rc = -ENOMEM;
goto out;
}
use = min_t(int, len, pfrag->size - pfrag->offset);
if (!sk_wmem_schedule(sk, use)) {
rc = -ENOMEM;
goto out;
}
sk_mem_charge(sk, use);
size += use;
orig_offset = pfrag->offset;
pfrag->offset += use;
sge = sg + num_elem - 1;
if (num_elem > first_coalesce && sg_page(sg) == pfrag->page &&
sg->offset + sg->length == orig_offset) {
sg->length += use;
} else {
sge++;
sg_unmark_end(sge);
sg_set_page(sge, pfrag->page, use, orig_offset);
get_page(pfrag->page);
++num_elem;
if (num_elem == MAX_SKB_FRAGS) {
rc = -ENOSPC;
break;
}
}
len -= use;
}
goto out;
out:
*sg_size = size;
*sg_num_elem = num_elem;
return rc;
}
static int alloc_encrypted_sg(struct sock *sk, int len)
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
int rc = 0;
rc = alloc_sg(sk, len, ctx->sg_encrypted_data,
&ctx->sg_encrypted_num_elem, &ctx->sg_encrypted_size, 0);
rc = sk_alloc_sg(sk, len,
ctx->sg_encrypted_data,
&ctx->sg_encrypted_num_elem,
&ctx->sg_encrypted_size, 0);
return rc;
}
@ -162,9 +107,9 @@ static int alloc_plaintext_sg(struct sock *sk, int len)
struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
int rc = 0;
rc = alloc_sg(sk, len, ctx->sg_plaintext_data,
&ctx->sg_plaintext_num_elem, &ctx->sg_plaintext_size,
tls_ctx->pending_open_record_frags);
rc = sk_alloc_sg(sk, len, ctx->sg_plaintext_data,
&ctx->sg_plaintext_num_elem, &ctx->sg_plaintext_size,
tls_ctx->pending_open_record_frags);
return rc;
}