ksmbd: smbd: relax the count of sges required

Remove the condition that the count of sges
must be greater than or equal to
SMB_DIRECT_MAX_SEND_SGES(8).
Because ksmbd needs sges only for SMB direct
header, SMB2 transform header, SMB2 response,
and optional payload.

Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Reviewed-by: Tom Talpey <tom@talpey.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/ksmbd/transport_rdma.c b/fs/ksmbd/transport_rdma.c
index e91acc2..d035e06 100644 (file)
--- a/fs/ksmbd/transport_rdma.c
+++ b/fs/ksmbd/transport_rdma.c
@@ -1711,11 +1711,11 @@ static int smb_direct_init_params(struct smb_direct_transport *t,
        int max_send_sges, max_rw_wrs, max_send_wrs;
        unsigned int max_sge_per_wr, wrs_per_credit;
 
-       /* need 2 more sge. because a SMB_DIRECT header will be mapped,
-        * and maybe a send buffer could be not page aligned.
+       /* need 3 more sge. because a SMB_DIRECT header, SMB2 header,
+        * SMB2 response could be mapped.
         */
        t->max_send_size = smb_direct_max_send_size;
-       max_send_sges = DIV_ROUND_UP(t->max_send_size, PAGE_SIZE) + 2;
+       max_send_sges = DIV_ROUND_UP(t->max_send_size, PAGE_SIZE) + 3;
        if (max_send_sges > SMB_DIRECT_MAX_SEND_SGES) {
                pr_err("max_send_size %d is too large\n", t->max_send_size);
                return -EINVAL;
@@ -1736,6 +1736,8 @@ static int smb_direct_init_params(struct smb_direct_transport *t,
 
        max_sge_per_wr = min_t(unsigned int, device->attrs.max_send_sge,
                               device->attrs.max_sge_rd);
+       max_sge_per_wr = max_t(unsigned int, max_sge_per_wr,
+                              max_send_sges);
        wrs_per_credit = max_t(unsigned int, 4,
                               DIV_ROUND_UP(t->pages_per_rw_credit,
                                            max_sge_per_wr) + 1);
@@ -1760,11 +1762,6 @@ static int smb_direct_init_params(struct smb_direct_transport *t,
                return -EINVAL;
        }
 
-       if (device->attrs.max_send_sge < SMB_DIRECT_MAX_SEND_SGES) {
-               pr_err("warning: device max_send_sge = %d too small\n",
-                      device->attrs.max_send_sge);
-               return -EINVAL;
-       }
        if (device->attrs.max_recv_sge < SMB_DIRECT_MAX_RECV_SGES) {
                pr_err("warning: device max_recv_sge = %d too small\n",
                       device->attrs.max_recv_sge);