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net/9p: add 'pooled_rbuffers' flag to struct p9_trans_module

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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]
Link: https://lkml.kernel.org/r/79d24310226bc4eb037892b5c097ec4ad4819a03.1657920926.git.linux_oss@crudebyte.com
Signed-off-by: Christian Schoenebeck <linux_oss@crudebyte.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
This commit is contained in:
Christian Schoenebeck 2022-07-15 23:33:09 +02:00 committed by Dominique Martinet
parent 1effdbf94a
commit 01d205d936
5 changed files with 9 additions and 0 deletions
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5
include/net/9p/transport.h
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@ -19,6 +19,10 @@
* @list: used to maintain a list of currently available transports * @list: used to maintain a list of currently available transports
* @name: the human-readable name of the transport * @name: the human-readable name of the transport
* @maxsize: transport provided maximum packet size * @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 * @def: set if this transport should be considered the default
* @create: member function to create a new connection on this transport * @create: member function to create a new connection on this transport
* @close: member function to discard a 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; struct list_head list;
char *name; /* name of transport */ char *name; /* name of transport */
int maxsize; /* max message size of transport */ int maxsize; /* max message size of transport */
bool pooled_rbuffers;
int def; /* this transport should be default */ int def; /* this transport should be default */
struct module *owner; struct module *owner;
int (*create)(struct p9_client *client, int (*create)(struct p9_client *client,

1
net/9p/trans_fd.c
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@ -1083,6 +1083,7 @@ p9_fd_create(struct p9_client *client, const char *addr, char *args)
static struct p9_trans_module p9_tcp_trans = { static struct p9_trans_module p9_tcp_trans = {
.name = "tcp", .name = "tcp",
.maxsize = MAX_SOCK_BUF, .maxsize = MAX_SOCK_BUF,
.pooled_rbuffers = false,
.def = 0, .def = 0,
.create = p9_fd_create_tcp, .create = p9_fd_create_tcp,
.close = p9_fd_close, .close = p9_fd_close,

1
net/9p/trans_rdma.c
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@ -739,6 +739,7 @@ error:
static struct p9_trans_module p9_rdma_trans = { static struct p9_trans_module p9_rdma_trans = {
.name = "rdma", .name = "rdma",
.maxsize = P9_RDMA_MAXSIZE, .maxsize = P9_RDMA_MAXSIZE,
.pooled_rbuffers = true,
.def = 0, .def = 0,
.owner = THIS_MODULE, .owner = THIS_MODULE,
.create = rdma_create_trans, .create = rdma_create_trans,

1
net/9p/trans_virtio.c
View File

@ -802,6 +802,7 @@ static struct p9_trans_module p9_virtio_trans = {
* page in zero copy. * page in zero copy.
*/ */
.maxsize = PAGE_SIZE * (VIRTQUEUE_NUM - 3), .maxsize = PAGE_SIZE * (VIRTQUEUE_NUM - 3),
.pooled_rbuffers = false,
.def = 1, .def = 1,
.owner = THIS_MODULE, .owner = THIS_MODULE,
}; };

1
net/9p/trans_xen.c
View File

@ -246,6 +246,7 @@ static irqreturn_t xen_9pfs_front_event_handler(int irq, void *r)
static struct p9_trans_module p9_xen_trans = { static struct p9_trans_module p9_xen_trans = {
.name = "xen", .name = "xen",
.maxsize = 1 << (XEN_9PFS_RING_ORDER + XEN_PAGE_SHIFT - 2), .maxsize = 1 << (XEN_9PFS_RING_ORDER + XEN_PAGE_SHIFT - 2),
.pooled_rbuffers = false,
.def = 1, .def = 1,
.create = p9_xen_create, .create = p9_xen_create,
.close = p9_xen_close, .close = p9_xen_close,