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net_dma: simple removal

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Per commit "7787380336 net_dma: mark broken" net_dma is no longer used
and there is no plan to fix it.

This is the mechanical removal of bits in CONFIG_NET_DMA ifdef guards.
Reverting the remainder of the net_dma induced changes is deferred to
subsequent patches.

Marked for stable due to Roman's report of a memory leak in
dma_pin_iovec_pages():

    https://lkml.org/lkml/2014/9/3/177

Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: David Whipple <whipple@securedatainnovations.ch>
Cc: Alexander Duyck <alexander.h.duyck@intel.com>
Cc: <stable@vger.kernel.org>
Reported-by: Roman Gushchin <klamm@yandex-team.ru>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2013-12-30 12:37:29 -08:00
parent 08223d80df
commit 7bced39751
28 changed files with 35 additions and 894 deletions
Download patch file Download diff file Expand all files Collapse all files

61
net/ipv4/tcp_input.c
View file

@ -73,7 +73,6 @@
#include <net/inet_common.h>
#include <linux/ipsec.h>
#include <asm/unaligned.h>
#include <net/netdma.h>
int sysctl_tcp_timestamps __read_mostly = 1;
int sysctl_tcp_window_scaling __read_mostly = 1;
@ -4970,53 +4969,6 @@ static inline bool tcp_checksum_complete_user(struct sock *sk,
__tcp_checksum_complete_user(sk, skb);
}
#ifdef CONFIG_NET_DMA
static bool tcp_dma_try_early_copy(struct sock *sk, struct sk_buff *skb,
int hlen)
{
struct tcp_sock *tp = tcp_sk(sk);
int chunk = skb->len - hlen;
int dma_cookie;
bool copied_early = false;
if (tp->ucopy.wakeup)
return false;
if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
tp->ucopy.dma_chan = net_dma_find_channel();
if (tp->ucopy.dma_chan && skb_csum_unnecessary(skb)) {
dma_cookie = dma_skb_copy_datagram_iovec(tp->ucopy.dma_chan,
skb, hlen,
tp->ucopy.iov, chunk,
tp->ucopy.pinned_list);
if (dma_cookie < 0)
goto out;
tp->ucopy.dma_cookie = dma_cookie;
copied_early = true;
tp->ucopy.len -= chunk;
tp->copied_seq += chunk;
tcp_rcv_space_adjust(sk);
if ((tp->ucopy.len == 0) ||
(tcp_flag_word(tcp_hdr(skb)) & TCP_FLAG_PSH) ||
(atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1))) {
tp->ucopy.wakeup = 1;
sk->sk_data_ready(sk, 0);
}
} else if (chunk > 0) {
tp->ucopy.wakeup = 1;
sk->sk_data_ready(sk, 0);
}
out:
return copied_early;
}
#endif /* CONFIG_NET_DMA */
/* Does PAWS and seqno based validation of an incoming segment, flags will
* play significant role here.
*/
@ -5201,14 +5153,6 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
if (tp->copied_seq == tp->rcv_nxt &&
len - tcp_header_len <= tp->ucopy.len) {
#ifdef CONFIG_NET_DMA
if (tp->ucopy.task == current &&
sock_owned_by_user(sk) &&
tcp_dma_try_early_copy(sk, skb, tcp_header_len)) {
copied_early = 1;
eaten = 1;
}
#endif
if (tp->ucopy.task == current &&
sock_owned_by_user(sk) && !copied_early) {
__set_current_state(TASK_RUNNING);
@ -5274,11 +5218,6 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
if (!copied_early || tp->rcv_nxt != tp->rcv_wup)
__tcp_ack_snd_check(sk, 0);
no_ack:
#ifdef CONFIG_NET_DMA
if (copied_early)
__skb_queue_tail(&sk->sk_async_wait_queue, skb);
else
#endif
if (eaten)
kfree_skb_partial(skb, fragstolen);
sk->sk_data_ready(sk, 0);