@@ -19,6 +19,10 @@
* @list: used to maintain a list of currently available transports
* @name: the human-readable name of the transport
* @maxsize: transport provided maximum packet size
+ * @pooled_rbuffers: currently only set for RDMA transport which pulls the
+ * response buffers from a shared pool, and accordingly
+ * we're less flexible when choosing the response message
+ * size in this case
* @def: set if this transport should be considered the default
* @create: member function to create a new connection on this transport
* @close: member function to discard a connection on this transport
@@ -38,6 +42,7 @@ struct p9_trans_module {
struct list_head list;
char *name; /* name of transport */
int maxsize; /* max message size of transport */
+ bool pooled_rbuffers;
int def; /* this transport should be default */
struct module *owner;
int (*create)(struct p9_client *client,
@@ -1081,6 +1081,7 @@ p9_fd_create(struct p9_client *client, const char *addr, char *args)
static struct p9_trans_module p9_tcp_trans = {
.name = "tcp",
.maxsize = MAX_SOCK_BUF,
+ .pooled_rbuffers = false,
.def = 0,
.create = p9_fd_create_tcp,
.close = p9_fd_close,
@@ -739,6 +739,7 @@ rdma_create_trans(struct p9_client *client, const char *addr, char *args)
static struct p9_trans_module p9_rdma_trans = {
.name = "rdma",
.maxsize = P9_RDMA_MAXSIZE,
+ .pooled_rbuffers = true,
.def = 0,
.owner = THIS_MODULE,
.create = rdma_create_trans,
@@ -1011,6 +1011,7 @@ static struct p9_trans_module p9_virtio_trans = {
*/
.maxsize = PAGE_SIZE *
((VIRTQUEUE_SG_NSGL_DEFAULT * SG_USER_PAGES_PER_LIST) - 3),
+ .pooled_rbuffers = false,
.def = 1,
.owner = THIS_MODULE,
};
@@ -246,6 +246,7 @@ static irqreturn_t xen_9pfs_front_event_handler(int irq, void *r)
static struct p9_trans_module p9_xen_trans = {
.name = "xen",
.maxsize = 1 << (XEN_9PFS_RING_ORDER + XEN_PAGE_SHIFT - 2),
+ .pooled_rbuffers = false,
.def = 1,
.create = p9_xen_create,
.close = p9_xen_close,
This is a preparatory change for the subsequent patch: the RDMA transport pulls the buffers for its 9p response messages from a shared pool. [1] So this case has to be considered when choosing an appropriate response message size in the subsequent patch. Link: https://lore.kernel.org/all/Ys3jjg52EIyITPua@codewreck.org/ [1] Signed-off-by: Christian Schoenebeck <linux_oss@crudebyte.com> --- include/net/9p/transport.h | 5 +++++ net/9p/trans_fd.c | 1 + net/9p/trans_rdma.c | 1 + net/9p/trans_virtio.c | 1 + net/9p/trans_xen.c | 1 + 5 files changed, 9 insertions(+)