> On Oct 7, 2015, at 5:14 AM, Leon Romanovsky <leon@xxxxxxx> wrote:
>
> On Tue, Oct 6, 2015 at 6:00 PM, Chuck Lever <chuck.lever@xxxxxxxxxx> wrote:
>> Pass the correct backchannel transport class to svc_create_xprt()
>> when setting up an NFSv4.1 backchannel transport.
>>
>> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
>> ---
>> fs/nfs/callback.c | 33 +++++++++++++++++++++------------
>> include/linux/sunrpc/xprt.h | 1 +
>> net/sunrpc/xprtrdma/transport.c | 1 +
>> net/sunrpc/xprtsock.c | 1 +
>> 4 files changed, 24 insertions(+), 12 deletions(-)
>>
>> diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
>> index 75f7c0a..46ed2c5 100644
>> --- a/fs/nfs/callback.c
>> +++ b/fs/nfs/callback.c
>> @@ -99,15 +99,22 @@ nfs4_callback_up(struct svc_serv *serv)
>> }
>>
>> #if defined(CONFIG_NFS_V4_1)
>> -static int nfs41_callback_up_net(struct svc_serv *serv, struct net *net)
>> +/*
>> + * Create an svc_sock for the back channel service that shares the
>> + * fore channel connection.
>> + * Returns the input port (0) and sets the svc_serv bc_xprt on success
>> + */
>> +static int nfs41_callback_up_net(struct svc_serv *serv, struct net *net,
>> + struct rpc_xprt *xprt)
>> {
>> - /*
>> - * Create an svc_sock for the back channel service that shares the
>> - * fore channel connection.
>> - * Returns the input port (0) and sets the svc_serv bc_xprt on success
>> - */
>> - return svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
>> - SVC_SOCK_ANONYMOUS);
>> + int ret = -EPROTONOSUPPORT;
>> +
>> + if (xprt->bc_name)
>> + ret = svc_create_xprt(serv, xprt->bc_name, net, PF_INET, 0,
>> + SVC_SOCK_ANONYMOUS);
>> + dprintk("NFS: svc_create_xprt(%s) returned %d\n",
>> + xprt->bc_name, ret);
>
> Maybe we should convert it to more general and common pr_debug(..)
> interface [1]?
> Despite the fact that the other parts of code already use the dprintk macro.
dprintk in this code is deprecated, and I used it here out
of laziness. I guess the maintainer might prefer a trace point
instead, or even no output.
In any event, converting dprintk to pr_debug() is out of scope
for this patch series.
>> + return ret;
>> }
>>
>> /*
>> @@ -184,7 +191,8 @@ static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
>> xprt->bc_serv = serv;
>> }
>> #else
>> -static int nfs41_callback_up_net(struct svc_serv *serv, struct net *net)
>> +static int nfs41_callback_up_net(struct svc_serv *serv, struct net *net,
>> + struct rpc_xprt *xprt)
>> {
>> return 0;
>> }
>> @@ -259,7 +267,8 @@ static void nfs_callback_down_net(u32 minorversion, struct svc_serv *serv, struc
>> svc_shutdown_net(serv, net);
>> }
>>
>> -static int nfs_callback_up_net(int minorversion, struct svc_serv *serv, struct net *net)
>> +static int nfs_callback_up_net(int minorversion, struct svc_serv *serv,
>> + struct net *net, struct rpc_xprt *xprt)
>> {
>> struct nfs_net *nn = net_generic(net, nfs_net_id);
>> int ret;
>> @@ -281,7 +290,7 @@ static int nfs_callback_up_net(int minorversion, struct svc_serv *serv, struct n
>> break;
>> case 1:
>> case 2:
>> - ret = nfs41_callback_up_net(serv, net);
>> + ret = nfs41_callback_up_net(serv, net, xprt);
>> break;
>> default:
>> printk(KERN_ERR "NFS: unknown callback version: %d\n",
> It can be pr_err(..) [1].
It can be, but this patch isn’t changing this line, nor
is it’s purpose to clean up error messages.
It would be better to submit a separate patch to clean
these up, if the maintainer suggests this is something
he will accept.
>
>> @@ -364,7 +373,7 @@ int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt)
>> goto err_create;
>> }
>>
>> - ret = nfs_callback_up_net(minorversion, serv, net);
>> + ret = nfs_callback_up_net(minorversion, serv, net, xprt);
>> if (ret < 0)
>> goto err_net;
>>
>> diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
>> index 82c0839..88bae18 100644
>> --- a/include/linux/sunrpc/xprt.h
>> +++ b/include/linux/sunrpc/xprt.h
>> @@ -170,6 +170,7 @@ struct rpc_xprt {
>> struct sockaddr_storage addr; /* server address */
>> size_t addrlen; /* size of server address */
>> int prot; /* IP protocol */
>> + char *bc_name; /* backchannel transport */
>>
>> unsigned long cong; /* current congestion */
>> unsigned long cwnd; /* congestion window */
>> diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
>> index 845278e..c60bbc8 100644
>> --- a/net/sunrpc/xprtrdma/transport.c
>> +++ b/net/sunrpc/xprtrdma/transport.c
>> @@ -337,6 +337,7 @@ xprt_setup_rdma(struct xprt_create *args)
>> /* Ensure xprt->addr holds valid server TCP (not RDMA)
>> * address, for any side protocols which peek at it */
>> xprt->prot = IPPROTO_TCP;
>> + xprt->bc_name = "rdma-bc";
>> xprt->addrlen = args->addrlen;
>> memcpy(&xprt->addr, sap, xprt->addrlen);
>>
>> diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
>> index 3084163..d82d00b 100644
>> --- a/net/sunrpc/xprtsock.c
>> +++ b/net/sunrpc/xprtsock.c
>> @@ -2858,6 +2858,7 @@ static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
>> transport = container_of(xprt, struct sock_xprt, xprt);
>>
>> xprt->prot = IPPROTO_TCP;
>> + xprt->bc_name = "tcp-bc";
>> xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
>> xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
>>
>
> [1] https://lwn.net/Articles/487437/
—
Chuck Lever
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