X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=net%2Fipv4%2Ftcp.c;h=74998f250071c20c21549b06ae2cf20341bc50c0;hb=fc13dcae24bfd877aeff07774c035b2b896e05ca;hp=e2b7b80550371dd836d3b32635c999b2a46f6fcc;hpb=badc48e6605ddeeb2484afae5993c859494decaa;p=linux-2.6 diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index e2b7b80550..74998f2500 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -263,7 +263,7 @@ #include #include #include - +#include #include #include @@ -622,14 +622,10 @@ ssize_t tcp_sendpage(struct socket *sock, struct page *page, int offset, ssize_t res; struct sock *sk = sock->sk; -#define TCP_ZC_CSUM_FLAGS (NETIF_F_IP_CSUM | NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) - if (!(sk->sk_route_caps & NETIF_F_SG) || - !(sk->sk_route_caps & TCP_ZC_CSUM_FLAGS)) + !(sk->sk_route_caps & NETIF_F_ALL_CSUM)) return sock_no_sendpage(sock, page, offset, size, flags); -#undef TCP_ZC_CSUM_FLAGS - lock_sock(sk); TCP_CHECK_TIMER(sk); res = do_tcp_sendpages(sk, &page, offset, size, flags); @@ -726,9 +722,7 @@ new_segment: /* * Check whether we can use HW checksum. */ - if (sk->sk_route_caps & - (NETIF_F_IP_CSUM | NETIF_F_NO_CSUM | - NETIF_F_HW_CSUM)) + if (sk->sk_route_caps & NETIF_F_ALL_CSUM) skb->ip_summed = CHECKSUM_HW; skb_entail(sk, tp, skb); @@ -937,7 +931,7 @@ static int tcp_recv_urg(struct sock *sk, long timeo, * calculation of whether or not we must ACK for the sake of * a window update. */ -static void cleanup_rbuf(struct sock *sk, int copied) +void tcp_cleanup_rbuf(struct sock *sk, int copied) { struct tcp_sock *tp = tcp_sk(sk); int time_to_ack = 0; @@ -1072,11 +1066,11 @@ int tcp_read_sock(struct sock *sk, read_descriptor_t *desc, break; } if (skb->h.th->fin) { - sk_eat_skb(sk, skb); + sk_eat_skb(sk, skb, 0); ++seq; break; } - sk_eat_skb(sk, skb); + sk_eat_skb(sk, skb, 0); if (!desc->count) break; } @@ -1086,7 +1080,7 @@ int tcp_read_sock(struct sock *sk, read_descriptor_t *desc, /* Clean up data we have read: This will do ACK frames. */ if (copied) - cleanup_rbuf(sk, copied); + tcp_cleanup_rbuf(sk, copied); return copied; } @@ -1110,6 +1104,7 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, int target; /* Read at least this many bytes */ long timeo; struct task_struct *user_recv = NULL; + int copied_early = 0; lock_sock(sk); @@ -1133,6 +1128,17 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); +#ifdef CONFIG_NET_DMA + tp->ucopy.dma_chan = NULL; + preempt_disable(); + if ((len > sysctl_tcp_dma_copybreak) && !(flags & MSG_PEEK) && + !sysctl_tcp_low_latency && __get_cpu_var(softnet_data.net_dma)) { + preempt_enable_no_resched(); + tp->ucopy.pinned_list = dma_pin_iovec_pages(msg->msg_iov, len); + } else + preempt_enable_no_resched(); +#endif + do { struct sk_buff *skb; u32 offset; @@ -1220,7 +1226,7 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, } } - cleanup_rbuf(sk, copied); + tcp_cleanup_rbuf(sk, copied); if (!sysctl_tcp_low_latency && tp->ucopy.task == user_recv) { /* Install new reader */ @@ -1274,6 +1280,10 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, } else sk_wait_data(sk, &timeo); +#ifdef CONFIG_NET_DMA + tp->ucopy.wakeup = 0; +#endif + if (user_recv) { int chunk; @@ -1329,13 +1339,39 @@ do_prequeue: } if (!(flags & MSG_TRUNC)) { - err = skb_copy_datagram_iovec(skb, offset, - msg->msg_iov, used); - if (err) { - /* Exception. Bailout! */ - if (!copied) - copied = -EFAULT; - break; +#ifdef CONFIG_NET_DMA + if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) + tp->ucopy.dma_chan = get_softnet_dma(); + + if (tp->ucopy.dma_chan) { + tp->ucopy.dma_cookie = dma_skb_copy_datagram_iovec( + tp->ucopy.dma_chan, skb, offset, + msg->msg_iov, used, + tp->ucopy.pinned_list); + + if (tp->ucopy.dma_cookie < 0) { + + printk(KERN_ALERT "dma_cookie < 0\n"); + + /* Exception. Bailout! */ + if (!copied) + copied = -EFAULT; + break; + } + if ((offset + used) == skb->len) + copied_early = 1; + + } else +#endif + { + err = skb_copy_datagram_iovec(skb, offset, + msg->msg_iov, used); + if (err) { + /* Exception. Bailout! */ + if (!copied) + copied = -EFAULT; + break; + } } } @@ -1355,15 +1391,19 @@ skip_copy: if (skb->h.th->fin) goto found_fin_ok; - if (!(flags & MSG_PEEK)) - sk_eat_skb(sk, skb); + if (!(flags & MSG_PEEK)) { + sk_eat_skb(sk, skb, copied_early); + copied_early = 0; + } continue; found_fin_ok: /* Process the FIN. */ ++*seq; - if (!(flags & MSG_PEEK)) - sk_eat_skb(sk, skb); + if (!(flags & MSG_PEEK)) { + sk_eat_skb(sk, skb, copied_early); + copied_early = 0; + } break; } while (len > 0); @@ -1386,12 +1426,42 @@ skip_copy: tp->ucopy.len = 0; } +#ifdef CONFIG_NET_DMA + if (tp->ucopy.dma_chan) { + struct sk_buff *skb; + dma_cookie_t done, used; + + dma_async_memcpy_issue_pending(tp->ucopy.dma_chan); + + while (dma_async_memcpy_complete(tp->ucopy.dma_chan, + tp->ucopy.dma_cookie, &done, + &used) == DMA_IN_PROGRESS) { + /* do partial cleanup of sk_async_wait_queue */ + while ((skb = skb_peek(&sk->sk_async_wait_queue)) && + (dma_async_is_complete(skb->dma_cookie, done, + used) == DMA_SUCCESS)) { + __skb_dequeue(&sk->sk_async_wait_queue); + kfree_skb(skb); + } + } + + /* Safe to free early-copied skbs now */ + __skb_queue_purge(&sk->sk_async_wait_queue); + dma_chan_put(tp->ucopy.dma_chan); + tp->ucopy.dma_chan = NULL; + } + if (tp->ucopy.pinned_list) { + dma_unpin_iovec_pages(tp->ucopy.pinned_list); + tp->ucopy.pinned_list = NULL; + } +#endif + /* According to UNIX98, msg_name/msg_namelen are ignored * on connected socket. I was just happy when found this 8) --ANK */ /* Clean up data we have read: This will do ACK frames. */ - cleanup_rbuf(sk, copied); + tcp_cleanup_rbuf(sk, copied); TCP_CHECK_TIMER(sk); release_sock(sk); @@ -1658,6 +1728,9 @@ int tcp_disconnect(struct sock *sk, int flags) __skb_queue_purge(&sk->sk_receive_queue); sk_stream_writequeue_purge(sk); __skb_queue_purge(&tp->out_of_order_queue); +#ifdef CONFIG_NET_DMA + __skb_queue_purge(&sk->sk_async_wait_queue); +#endif inet->dport = 0; @@ -1858,7 +1931,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level, (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT) && inet_csk_ack_scheduled(sk)) { icsk->icsk_ack.pending |= ICSK_ACK_PUSHED; - cleanup_rbuf(sk, 1); + tcp_cleanup_rbuf(sk, 1); if (!(val & 1)) icsk->icsk_ack.pingpong = 1; }