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![Chuck Lever](/assets/img/avatar_default.png)
The return type of xdr_skb_read_actor functions is size_t. This fixes a
nit I unwittingly overlooked in commit dd456471
.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
184 lines
4.5 KiB
C
184 lines
4.5 KiB
C
/*
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* linux/net/sunrpc/socklib.c
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*
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* Common socket helper routines for RPC client and server
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/compiler.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/types.h>
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#include <linux/pagemap.h>
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#include <linux/udp.h>
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#include <linux/sunrpc/xdr.h>
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/**
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* xdr_skb_read_bits - copy some data bits from skb to internal buffer
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* @desc: sk_buff copy helper
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* @to: copy destination
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* @len: number of bytes to copy
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*
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* Possibly called several times to iterate over an sk_buff and copy
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* data out of it.
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*/
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size_t xdr_skb_read_bits(struct xdr_skb_reader *desc, void *to, size_t len)
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{
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if (len > desc->count)
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len = desc->count;
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if (unlikely(skb_copy_bits(desc->skb, desc->offset, to, len)))
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return 0;
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desc->count -= len;
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desc->offset += len;
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return len;
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}
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EXPORT_SYMBOL_GPL(xdr_skb_read_bits);
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/**
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* xdr_skb_read_and_csum_bits - copy and checksum from skb to buffer
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* @desc: sk_buff copy helper
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* @to: copy destination
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* @len: number of bytes to copy
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*
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* Same as skb_read_bits, but calculate a checksum at the same time.
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*/
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static size_t xdr_skb_read_and_csum_bits(struct xdr_skb_reader *desc, void *to, size_t len)
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{
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unsigned int pos;
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__wsum csum2;
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if (len > desc->count)
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len = desc->count;
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pos = desc->offset;
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csum2 = skb_copy_and_csum_bits(desc->skb, pos, to, len, 0);
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desc->csum = csum_block_add(desc->csum, csum2, pos);
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desc->count -= len;
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desc->offset += len;
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return len;
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}
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/**
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* xdr_partial_copy_from_skb - copy data out of an skb
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* @xdr: target XDR buffer
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* @base: starting offset
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* @desc: sk_buff copy helper
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* @copy_actor: virtual method for copying data
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*
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*/
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ssize_t xdr_partial_copy_from_skb(struct xdr_buf *xdr, unsigned int base, struct xdr_skb_reader *desc, xdr_skb_read_actor copy_actor)
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{
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struct page **ppage = xdr->pages;
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unsigned int len, pglen = xdr->page_len;
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ssize_t copied = 0;
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size_t ret;
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len = xdr->head[0].iov_len;
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if (base < len) {
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len -= base;
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ret = copy_actor(desc, (char *)xdr->head[0].iov_base + base, len);
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copied += ret;
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if (ret != len || !desc->count)
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goto out;
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base = 0;
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} else
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base -= len;
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if (unlikely(pglen == 0))
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goto copy_tail;
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if (unlikely(base >= pglen)) {
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base -= pglen;
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goto copy_tail;
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}
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if (base || xdr->page_base) {
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pglen -= base;
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base += xdr->page_base;
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ppage += base >> PAGE_CACHE_SHIFT;
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base &= ~PAGE_CACHE_MASK;
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}
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do {
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char *kaddr;
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/* ACL likes to be lazy in allocating pages - ACLs
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* are small by default but can get huge. */
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if (unlikely(*ppage == NULL)) {
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*ppage = alloc_page(GFP_ATOMIC);
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if (unlikely(*ppage == NULL)) {
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if (copied == 0)
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copied = -ENOMEM;
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goto out;
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}
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}
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len = PAGE_CACHE_SIZE;
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kaddr = kmap_atomic(*ppage, KM_SKB_SUNRPC_DATA);
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if (base) {
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len -= base;
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if (pglen < len)
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len = pglen;
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ret = copy_actor(desc, kaddr + base, len);
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base = 0;
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} else {
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if (pglen < len)
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len = pglen;
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ret = copy_actor(desc, kaddr, len);
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}
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flush_dcache_page(*ppage);
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kunmap_atomic(kaddr, KM_SKB_SUNRPC_DATA);
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copied += ret;
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if (ret != len || !desc->count)
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goto out;
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ppage++;
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} while ((pglen -= len) != 0);
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copy_tail:
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len = xdr->tail[0].iov_len;
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if (base < len)
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copied += copy_actor(desc, (char *)xdr->tail[0].iov_base + base, len - base);
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out:
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return copied;
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}
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EXPORT_SYMBOL_GPL(xdr_partial_copy_from_skb);
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/**
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* csum_partial_copy_to_xdr - checksum and copy data
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* @xdr: target XDR buffer
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* @skb: source skb
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*
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* We have set things up such that we perform the checksum of the UDP
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* packet in parallel with the copies into the RPC client iovec. -DaveM
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*/
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int csum_partial_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
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{
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struct xdr_skb_reader desc;
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desc.skb = skb;
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desc.offset = sizeof(struct udphdr);
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desc.count = skb->len - desc.offset;
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if (skb_csum_unnecessary(skb))
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goto no_checksum;
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desc.csum = csum_partial(skb->data, desc.offset, skb->csum);
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if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_and_csum_bits) < 0)
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return -1;
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if (desc.offset != skb->len) {
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__wsum csum2;
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csum2 = skb_checksum(skb, desc.offset, skb->len - desc.offset, 0);
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desc.csum = csum_block_add(desc.csum, csum2, desc.offset);
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}
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if (desc.count)
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return -1;
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if (csum_fold(desc.csum))
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return -1;
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if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE))
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netdev_rx_csum_fault(skb->dev);
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return 0;
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no_checksum:
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if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
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return -1;
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if (desc.count)
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return -1;
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return 0;
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}
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EXPORT_SYMBOL_GPL(csum_partial_copy_to_xdr);
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