diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index a6c6051ec85811041277c64d675810f14d9da851..0f1ca74fe0bb9edc21b54119dbb1b82754e9b703 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -332,6 +332,20 @@ struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type) } EXPORT_SYMBOL(dma_find_channel); +/* + * net_dma_find_channel - find a channel for net_dma + * net_dma has alignment requirements + */ +struct dma_chan *net_dma_find_channel(void) +{ + struct dma_chan *chan = dma_find_channel(DMA_MEMCPY); + if (chan && !is_dma_copy_aligned(chan->device, 1, 1, 1)) + return NULL; + + return chan; +} +EXPORT_SYMBOL(net_dma_find_channel); + /** * dma_issue_pending_all - flush all pending operations across all channels */ diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 679b349d9b66695f65bb3597b2a530e3e9709600..a5bb3ad5c7a5a6a89d16d529c564f6e2e3274642 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -948,6 +948,7 @@ int dma_async_device_register(struct dma_device *device); void dma_async_device_unregister(struct dma_device *device); void dma_run_dependencies(struct dma_async_tx_descriptor *tx); struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type); +struct dma_chan *net_dma_find_channel(void); #define dma_request_channel(mask, x, y) __dma_request_channel(&(mask), x, y) /* --- Helper iov-locking functions --- */ diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 22ef5f9fd2ff2e92dc4955dc9a2ac450d8a435fa..8712c5d4f91de3064a27b12999ac6b4927185fd7 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -1450,7 +1450,7 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, if ((available < target) && (len > sysctl_tcp_dma_copybreak) && !(flags & MSG_PEEK) && !sysctl_tcp_low_latency && - dma_find_channel(DMA_MEMCPY)) { + net_dma_find_channel()) { preempt_enable_no_resched(); tp->ucopy.pinned_list = dma_pin_iovec_pages(msg->msg_iov, len); @@ -1665,7 +1665,7 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, if (!(flags & MSG_TRUNC)) { #ifdef CONFIG_NET_DMA if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) - tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); + tp->ucopy.dma_chan = net_dma_find_channel(); if (tp->ucopy.dma_chan) { tp->ucopy.dma_cookie = dma_skb_copy_datagram_iovec( diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index b5e315f13641d683c2ab9031c0d52969c6c0873a..27c676dfea336017faf91d69028c9a10eead4296 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -5190,7 +5190,7 @@ static int tcp_dma_try_early_copy(struct sock *sk, struct sk_buff *skb, return 0; if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) - tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); + tp->ucopy.dma_chan = net_dma_find_channel(); if (tp->ucopy.dma_chan && skb_csum_unnecessary(skb)) { diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index fd54c5f8a255e81f490846e13fa827da9aaf77ac..3810b6fe0a1e801ed7820072b6776bc94a6fa0c5 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1727,7 +1727,7 @@ int tcp_v4_rcv(struct sk_buff *skb) #ifdef CONFIG_NET_DMA struct tcp_sock *tp = tcp_sk(sk); if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) - tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); + tp->ucopy.dma_chan = net_dma_find_channel(); if (tp->ucopy.dma_chan) ret = tcp_v4_do_rcv(sk, skb); else diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 3edd05ae4388741176949e9c72f3543fa8d52c87..fcb3e4f0010ee3bf25b07fdfdbd61cc68c291b8d 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1755,7 +1755,7 @@ static int tcp_v6_rcv(struct sk_buff *skb) #ifdef CONFIG_NET_DMA struct tcp_sock *tp = tcp_sk(sk); if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) - tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); + tp->ucopy.dma_chan = net_dma_find_channel(); if (tp->ucopy.dma_chan) ret = tcp_v6_do_rcv(sk, skb); else