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Merge branch 'net-tls-small-TX-offload-optimizations'

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Jakub Kicinski says:

====================
net/tls: small TX offload optimizations

This set brings small TLS TX device optimizations. The biggest
gain comes from fixing a misuse of non temporal copy instructions.
On a synthetic workload modelled after customer's RFC application
I see 3-5% percent gain.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2019-09-07 18:10:34 +02:00
commit 6703a605b5
1 changed files with 91 additions and 39 deletions
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130
net/tls/tls_device.c
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@ -122,13 +122,10 @@ static struct net_device *get_netdev_for_sock(struct sock *sk)
static void destroy_record(struct tls_record_info *record)
{
int nr_frags = record->num_frags;
skb_frag_t *frag;
int i;
while (nr_frags-- > 0) {
frag = &record->frags[nr_frags];
__skb_frag_unref(frag);
}
for (i = 0; i < record->num_frags; i++)
__skb_frag_unref(&record->frags[i]);
kfree(record);
}
@ -259,33 +256,15 @@ static int tls_push_record(struct sock *sk,
struct tls_context *ctx,
struct tls_offload_context_tx *offload_ctx,
struct tls_record_info *record,
struct page_frag *pfrag,
int flags,
unsigned char record_type)
int flags)
{
struct tls_prot_info *prot = &ctx->prot_info;
struct tcp_sock *tp = tcp_sk(sk);
struct page_frag dummy_tag_frag;
skb_frag_t *frag;
int i;
/* fill prepend */
frag = &record->frags[0];
tls_fill_prepend(ctx,
skb_frag_address(frag),
record->len - prot->prepend_size,
record_type,
prot->version);
/* HW doesn't care about the data in the tag, because it fills it. */
dummy_tag_frag.page = skb_frag_page(frag);
dummy_tag_frag.offset = 0;
tls_append_frag(record, &dummy_tag_frag, prot->tag_size);
record->end_seq = tp->write_seq + record->len;
spin_lock_irq(&offload_ctx->lock);
list_add_tail(&record->list, &offload_ctx->records_list);
spin_unlock_irq(&offload_ctx->lock);
list_add_tail_rcu(&record->list, &offload_ctx->records_list);
offload_ctx->open_record = NULL;
if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags))
@ -307,6 +286,38 @@ static int tls_push_record(struct sock *sk,
return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags);
}
static int tls_device_record_close(struct sock *sk,
struct tls_context *ctx,
struct tls_record_info *record,
struct page_frag *pfrag,
unsigned char record_type)
{
struct tls_prot_info *prot = &ctx->prot_info;
int ret;
/* append tag
* device will fill in the tag, we just need to append a placeholder
* use socket memory to improve coalescing (re-using a single buffer
* increases frag count)
* if we can't allocate memory now, steal some back from data
*/
if (likely(skb_page_frag_refill(prot->tag_size, pfrag,
sk->sk_allocation))) {
ret = 0;
tls_append_frag(record, pfrag, prot->tag_size);
} else {
ret = prot->tag_size;
if (record->len <= prot->overhead_size)
return -ENOMEM;
}
/* fill prepend */
tls_fill_prepend(ctx, skb_frag_address(&record->frags[0]),
record->len - prot->overhead_size,
record_type, prot->version);
return ret;
}
static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx,
struct page_frag *pfrag,
size_t prepend_size)
@ -361,6 +372,31 @@ static int tls_do_allocation(struct sock *sk,
return 0;
}
static int tls_device_copy_data(void *addr, size_t bytes, struct iov_iter *i)
{
size_t pre_copy, nocache;
pre_copy = ~((unsigned long)addr - 1) & (SMP_CACHE_BYTES - 1);
if (pre_copy) {
pre_copy = min(pre_copy, bytes);
if (copy_from_iter(addr, pre_copy, i) != pre_copy)
return -EFAULT;
bytes -= pre_copy;
addr += pre_copy;
}
nocache = round_down(bytes, SMP_CACHE_BYTES);
if (copy_from_iter_nocache(addr, nocache, i) != nocache)
return -EFAULT;
bytes -= nocache;
addr += nocache;
if (bytes && copy_from_iter(addr, bytes, i) != bytes)
return -EFAULT;
return 0;
}
static int tls_push_data(struct sock *sk,
struct iov_iter *msg_iter,
size_t size, int flags,
@ -434,12 +470,10 @@ static int tls_push_data(struct sock *sk,
copy = min_t(size_t, size, (pfrag->size - pfrag->offset));
copy = min_t(size_t, copy, (max_open_record_len - record->len));
if (copy_from_iter_nocache(page_address(pfrag->page) +
pfrag->offset,
copy, msg_iter) != copy) {
rc = -EFAULT;
rc = tls_device_copy_data(page_address(pfrag->page) +
pfrag->offset, copy, msg_iter);
if (rc)
goto handle_error;
}
tls_append_frag(record, pfrag, copy);
size -= copy;
@ -457,13 +491,24 @@ static int tls_push_data(struct sock *sk,
if (done || record->len >= max_open_record_len ||
(record->num_frags >= MAX_SKB_FRAGS - 1)) {
rc = tls_device_record_close(sk, tls_ctx, record,
pfrag, record_type);
if (rc) {
if (rc > 0) {
size += rc;
} else {
size = orig_size;
destroy_record(record);
ctx->open_record = NULL;
break;
}
}
rc = tls_push_record(sk,
tls_ctx,
ctx,
record,
pfrag,
tls_push_record_flags,
record_type);
tls_push_record_flags);
if (rc < 0)
break;
}
@ -538,12 +583,16 @@ struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
/* if retransmit_hint is irrelevant start
* from the beggining of the list
*/
info = list_first_entry(&context->records_list,
struct tls_record_info, list);
info = list_first_entry_or_null(&context->records_list,
struct tls_record_info, list);
if (!info)
return NULL;
record_sn = context->unacked_record_sn;
}
list_for_each_entry_from(info, &context->records_list, list) {
/* We just need the _rcu for the READ_ONCE() */
rcu_read_lock();
list_for_each_entry_from_rcu(info, &context->records_list, list) {
if (before(seq, info->end_seq)) {
if (!context->retransmit_hint ||
after(info->end_seq,
@ -552,12 +601,15 @@ struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
context->retransmit_hint = info;
}
*p_record_sn = record_sn;
return info;
goto exit_rcu_unlock;
}
record_sn++;
}
info = NULL;
return NULL;
exit_rcu_unlock:
rcu_read_unlock();
return info;
}
EXPORT_SYMBOL(tls_get_record);