On Wed, Apr 6, 2016 at 7:12 PM, Franklin S Cooper Jr. <fcooper@xxxxxx> wrote:
> Hi All,
>
> Currently linux-next is failing to boot via NFS on my AM335x GP evm,
> AM437x GP evm and Beagle X15. I bisected the problem down to the commit
> "udp: remove headers from UDP packets before queueing".
>
> I had to revert the following three commits to get things working again:
>
> e6afc8ace6dd5cef5e812f26c72579da8806f5ac
> udp: remove headers from UDP packets before queueing
>
> 627d2d6b550094d88f9e518e15967e7bf906ebbf
> udp: enable MSG_PEEK at non-zero offset
>
> b9bb53f3836f4eb2bdeb3447be11042bd29c2408
> sock: convert sk_peek_offset functions to WRITE_ONCE
>
Thanks for the report, and apologies for breaking your configuration.
I had missed that sunrpc can dequeue skbs from a udp receive
queue and makes assumptions about the layout of those packets. rxrpc
does the same. From what I can tell so far, those are the only two
protocols that do this. I have verified that the following fixes rxrpc for me
--- a/net/rxrpc/ar-input.c
+++ b/net/rxrpc/ar-input.c
@@ -612,9 +612,9 @@ int rxrpc_extract_header(struct rxrpc_skb_priv
*sp, struct sk_buff *skb)
struct rxrpc_wire_header whdr;
/* dig out the RxRPC connection details */
- if (skb_copy_bits(skb, sizeof(struct udphdr), &whdr, sizeof(whdr)) < 0)
+ if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0)
return -EBADMSG;
- if (!pskb_pull(skb, sizeof(struct udphdr) + sizeof(whdr)))
+ if (!pskb_pull(skb, sizeof(whdr)))
BUG();
I have not yet been able to reproduce the sunrpc/nfs issue, but I
suspect that the following might fix it. I will try to create an NFS
setup.
diff --git a/net/sunrpc/socklib.c b/net/sunrpc/socklib.c
index 2df87f7..8ab40ba 100644
--- a/net/sunrpc/socklib.c
+++ b/net/sunrpc/socklib.c
@@ -155,7 +155,7 @@ int csum_partial_copy_to_xdr(struct xdr_buf *xdr,
struct sk_buff *skb)
struct xdr_skb_reader desc;
desc.skb = skb;
- desc.offset = sizeof(struct udphdr);
+ desc.offset = 0;
desc.count = skb->len - desc.offset;
if (skb_csum_unnecessary(skb))
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 1413cdc..71d6072 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -617,7 +617,7 @@ static int svc_udp_recvfrom(struct svc_rqst *rqstp)
svsk->sk_sk->sk_stamp = skb->tstamp;
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be
more data... */
- len = skb->len - sizeof(struct udphdr);
+ len = skb->len;
rqstp->rq_arg.len = len;
rqstp->rq_prot = IPPROTO_UDP;
@@ -641,8 +641,7 @@ static int svc_udp_recvfrom(struct svc_rqst *rqstp)
skb_free_datagram_locked(svsk->sk_sk, skb);
} else {
/* we can use it in-place */
- rqstp->rq_arg.head[0].iov_base = skb->data +
- sizeof(struct udphdr);
+ rqstp->rq_arg.head[0].iov_base = skb->data;
rqstp->rq_arg.head[0].iov_len = len;
if (skb_checksum_complete(skb))
goto out_free;
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 65e7595..c1fc7b2 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -995,15 +995,14 @@ static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
u32 _xid;
__be32 *xp;
- repsize = skb->len - sizeof(struct udphdr);
+ repsize = skb->len;
if (repsize < 4) {
dprintk("RPC: impossible RPC reply size %d!\n", repsize);
return;
}
/* Copy the XID from the skb... */
- xp = skb_header_pointer(skb, sizeof(struct udphdr),
- sizeof(_xid), &_xid);
+ xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
if (xp == NULL)
return;
--
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