net: add skb frag size accessors

To ease skb->truesize sanitization, its better to be able to localize
all references to skb frags size.

Define accessors : skb_frag_size() to fetch frag size, and
skb_frag_size_{set|add|sub}() to manipulate it.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
index 77ac217ad5ce..be69da38ccaa 100644
--- a/drivers/scsi/cxgbi/libcxgbi.c
+++ b/drivers/scsi/cxgbi/libcxgbi.c
@@ -1814,8 +1814,8 @@ static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
                 copy = min(datalen, sglen);
                 if (i && page == frags[i - 1].page &&
                     sgoffset + sg->offset ==
-                        frags[i - 1].page_offset + frags[i - 1].size) {
-                        frags[i - 1].size += copy;
+                        frags[i - 1].page_offset + skb_frag_size(&frags[i - 1])) {
+                        skb_frag_size_add(&frags[i - 1], copy);
                 } else {
                         if (i >= frag_max) {
                                 pr_warn("too many pages %u, dlen %u.\n",
@@ -1825,7 +1825,7 @@ static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
 
                         frags[i].page = page;
                         frags[i].page_offset = sg->offset + sgoffset;
-                        frags[i].size = copy;
+                        skb_frag_size_set(&frags[i], copy);
                         i++;
                 }
                 datalen -= copy;
@@ -1951,8 +1951,8 @@ int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
                                 char *src = kmap_atomic(frag->page,
                                                         KM_SOFTIRQ0);
 
-                                memcpy(dst, src+frag->page_offset, frag->size);
-                                dst += frag->size;
+                                memcpy(dst, src+frag->page_offset, skb_frag_size(frag));
+                                dst += skb_frag_size(frag);
                                 kunmap_atomic(src, KM_SOFTIRQ0);
                         }
                         if (padlen) {