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smb: smbdirect: introduce smbdirect_connection_negotiate_rdma_resources()

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This is a copy of the same logic used in client and server,
it's inlined there, but they will use the new helper function
soon.

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Stefan Metzmacher 2025-09-17 06:19:46 +02:00 committed by Steve French
parent 0bac604158
commit 71c4b615da
1 changed files with 62 additions and 0 deletions
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62
fs/smb/common/smbdirect/smbdirect_connection.c
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@ -275,6 +275,68 @@ smbdirect_connection_reassembly_first_recv_io(struct smbdirect_socket *sc)
return msg;
}
__maybe_unused /* this is temporary while this file is included in others */
static void smbdirect_connection_negotiate_rdma_resources(struct smbdirect_socket *sc,
u8 peer_initiator_depth,
u8 peer_responder_resources,
const struct rdma_conn_param *param)
{
struct smbdirect_socket_parameters *sp = &sc->parameters;
if (rdma_protocol_iwarp(sc->ib.dev, sc->rdma.cm_id->port_num) &&
param->private_data_len == 8) {
/*
* Legacy clients with only iWarp MPA v1 support
* need a private blob in order to negotiate
* the IRD/ORD values.
*/
const __be32 *ird_ord_hdr = param->private_data;
u32 ird32 = be32_to_cpu(ird_ord_hdr[0]);
u32 ord32 = be32_to_cpu(ird_ord_hdr[1]);
/*
* cifs.ko sends the legacy IRD/ORD negotiation
* event if iWarp MPA v2 was used.
*
* Here we check that the values match and only
* mark the client as legacy if they don't match.
*/
if ((u32)param->initiator_depth != ird32 ||
(u32)param->responder_resources != ord32) {
/*
* There are broken clients (old cifs.ko)
* using little endian and also
* struct rdma_conn_param only uses u8
* for initiator_depth and responder_resources,
* so we truncate the value to U8_MAX.
*
* smb_direct_accept_client() will then
* do the real negotiation in order to
* select the minimum between client and
* server.
*/
ird32 = min_t(u32, ird32, U8_MAX);
ord32 = min_t(u32, ord32, U8_MAX);
sc->rdma.legacy_iwarp = true;
peer_initiator_depth = (u8)ird32;
peer_responder_resources = (u8)ord32;
}
}
/*
* negotiate the value by using the minimum
* between client and server if the client provided
* non 0 values.
*/
if (peer_initiator_depth != 0)
sp->initiator_depth = min_t(u8, sp->initiator_depth,
peer_initiator_depth);
if (peer_responder_resources != 0)
sp->responder_resources = min_t(u8, sp->responder_resources,
peer_responder_resources);
}
static void smbdirect_connection_idle_timer_work(struct work_struct *work)
{
struct smbdirect_socket *sc =