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Message-Id: <1423032009-18367-5-git-send-email-viro@ZenIV.linux.org.uk> Date: Wed, 4 Feb 2015 06:39:56 +0000 From: Al Viro <viro@...IV.linux.org.uk> To: David Miller <davem@...emloft.net> Cc: netdev@...r.kernel.org Subject: [PATCH v3 05/18] rxrpc: switch rxrpc_send_data() to iov_iter primitives From: Al Viro <viro@...iv.linux.org.uk> Convert skb_add_data() to iov_iter; allows to get rid of the explicit messing with iovec in its only caller - skb_add_data() will keep advancing ->msg_iter for us, so there's no need to similate that manually. Signed-off-by: Al Viro <viro@...iv.linux.org.uk> --- include/linux/skbuff.h | 11 +++++------ net/rxrpc/ar-output.c | 43 ++++++++++--------------------------------- 2 files changed, 15 insertions(+), 39 deletions(-) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 85ab7d7..9a8bafe 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -2484,19 +2484,18 @@ static inline int skb_put_padto(struct sk_buff *skb, unsigned int len) } static inline int skb_add_data(struct sk_buff *skb, - char __user *from, int copy) + struct iov_iter *from, int copy) { const int off = skb->len; if (skb->ip_summed == CHECKSUM_NONE) { - int err = 0; - __wsum csum = csum_and_copy_from_user(from, skb_put(skb, copy), - copy, 0, &err); - if (!err) { + __wsum csum = 0; + if (csum_and_copy_from_iter(skb_put(skb, copy), copy, + &csum, from) == copy) { skb->csum = csum_block_add(skb->csum, csum, off); return 0; } - } else if (!copy_from_user(skb_put(skb, copy), from, copy)) + } else if (copy_from_iter(skb_put(skb, copy), copy, from) == copy) return 0; __skb_trim(skb, off); diff --git a/net/rxrpc/ar-output.c b/net/rxrpc/ar-output.c index e1a9373..963a5b9 100644 --- a/net/rxrpc/ar-output.c +++ b/net/rxrpc/ar-output.c @@ -529,13 +529,11 @@ static int rxrpc_send_data(struct kiocb *iocb, struct msghdr *msg, size_t len) { struct rxrpc_skb_priv *sp; - unsigned char __user *from; struct sk_buff *skb; - const struct iovec *iov; struct sock *sk = &rx->sk; long timeo; bool more; - int ret, ioc, segment, copied; + int ret, copied; timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); @@ -545,25 +543,17 @@ static int rxrpc_send_data(struct kiocb *iocb, if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) return -EPIPE; - iov = msg->msg_iter.iov; - ioc = msg->msg_iter.nr_segs - 1; - from = iov->iov_base; - segment = iov->iov_len; - iov++; more = msg->msg_flags & MSG_MORE; skb = call->tx_pending; call->tx_pending = NULL; copied = 0; - do { + if (len > iov_iter_count(&msg->msg_iter)) + len = iov_iter_count(&msg->msg_iter); + while (len) { int copy; - if (segment > len) - segment = len; - - _debug("SEGMENT %d @%p", segment, from); - if (!skb) { size_t size, chunk, max, space; @@ -631,13 +621,13 @@ static int rxrpc_send_data(struct kiocb *iocb, /* append next segment of data to the current buffer */ copy = skb_tailroom(skb); ASSERTCMP(copy, >, 0); - if (copy > segment) - copy = segment; + if (copy > len) + copy = len; if (copy > sp->remain) copy = sp->remain; _debug("add"); - ret = skb_add_data(skb, from, copy); + ret = skb_add_data(skb, &msg->msg_iter, copy); _debug("added"); if (ret < 0) goto efault; @@ -646,18 +636,6 @@ static int rxrpc_send_data(struct kiocb *iocb, copied += copy; len -= copy; - segment -= copy; - from += copy; - while (segment == 0 && ioc > 0) { - from = iov->iov_base; - segment = iov->iov_len; - iov++; - ioc--; - } - if (len == 0) { - segment = 0; - ioc = 0; - } /* check for the far side aborting the call or a network error * occurring */ @@ -665,7 +643,7 @@ static int rxrpc_send_data(struct kiocb *iocb, goto call_aborted; /* add the packet to the send queue if it's now full */ - if (sp->remain <= 0 || (segment == 0 && !more)) { + if (sp->remain <= 0 || (!len && !more)) { struct rxrpc_connection *conn = call->conn; uint32_t seq; size_t pad; @@ -711,11 +689,10 @@ static int rxrpc_send_data(struct kiocb *iocb, memcpy(skb->head, &sp->hdr, sizeof(struct rxrpc_header)); - rxrpc_queue_packet(call, skb, segment == 0 && !more); + rxrpc_queue_packet(call, skb, !iov_iter_count(&msg->msg_iter) && !more); skb = NULL; } - - } while (segment > 0); + } success: ret = copied; -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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