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SubjectRe: [Patch v8 02/16] CIFS: SMBD: Implement function to reconnect to a SMB Direct transport
various checkpatch errors (remember to run scripts/chekckpatch.pl
before submitting)

On Wed, Nov 22, 2017 at 6:38 PM, Long Li <longli@exchange.microsoft.com> wrote:
> From: Long Li <longli@microsoft.com>
>
> Add function to implement a reconnect to SMB Direct. This involves tearing down
> the current connection and establishing/negotiating a new connection.
>
> Signed-off-by: Long Li <longli@microsoft.com>
> ---
> fs/cifs/smbdirect.c | 36 ++++++++++++++++++++++++++++++++++++
> fs/cifs/smbdirect.h | 4 ++++
> 2 files changed, 40 insertions(+)
>
> diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
> index 862cdf9..a96058a 100644
> --- a/fs/cifs/smbdirect.c
> +++ b/fs/cifs/smbdirect.c
> @@ -1387,6 +1387,42 @@ static void idle_connection_timer(struct work_struct *work)
> info->keep_alive_interval*HZ);
> }
>
> +/*
> + * Reconnect this SMBD connection, called from upper layer
> + * return value: 0 on success, or actual error code
> + */
> +int smbd_reconnect(struct TCP_Server_Info *server)
> +{
> + log_rdma_event(INFO, "reconnecting rdma session\n");
> +
> + if (!server->smbd_conn) {
> + log_rdma_event(ERR, "rdma session already destroyed\n");
> + return -EINVAL;
> + }
> +
> + /*
> + * This is possible if transport is disconnected and we haven't received
> + * notification from RDMA, but upper layer has detected timeout
> + */
> + if (server->smbd_conn->transport_status == SMBD_CONNECTED) {
> + log_rdma_event(INFO, "disconnecting transport\n");
> + smbd_disconnect_rdma_connection(server->smbd_conn);
> + }
> +
> + /* wait until the transport is destroyed */
> + wait_event(server->smbd_conn->wait_destroy,
> + server->smbd_conn->transport_status == SMBD_DESTROYED);
> +
> + destroy_workqueue(server->smbd_conn->workqueue);
> + kfree(server->smbd_conn);
> +
> + log_rdma_event(INFO, "creating rdma session\n");
> + server->smbd_conn = smbd_get_connection(
> + server, (struct sockaddr *) &server->dstaddr);
> +
> + return server->smbd_conn ? 0 : -ENOENT;
> +}
> +
> static void destroy_caches_and_workqueue(struct smbd_connection *info)
> {
> destroy_receive_buffers(info);
> diff --git a/fs/cifs/smbdirect.h b/fs/cifs/smbdirect.h
> index 25b3782..8948f06 100644
> --- a/fs/cifs/smbdirect.h
> +++ b/fs/cifs/smbdirect.h
> @@ -247,11 +247,15 @@ struct smbd_response {
> struct smbd_connection *smbd_get_connection(
> struct TCP_Server_Info *server, struct sockaddr *dstaddr);
>
> +/* Reconnect SMBDirect session */
> +int smbd_reconnect(struct TCP_Server_Info *server);
> +
> #else
> #define cifs_rdma_enabled(server) 0
> struct smbd_connection {};
> static inline void *smbd_get_connection(
> struct TCP_Server_Info *server, struct sockaddr *dstaddr) {return NULL;}
> +static inline int smbd_reconnect(struct TCP_Server_Info *server) {return -1;}
> #endif
>
> #endif
> --
> 2.7.4
>
> --
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--
Thanks,

Steve

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