* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
- *
- * $Id: mthca_main.c 1396 2004-12-28 04:10:27Z roland $
*/
#include <linux/module.h>
#include "mthca_cmd.h"
#include "mthca_profile.h"
#include "mthca_memfree.h"
+#include "mthca_wqe.h"
MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("Mellanox InfiniBand HCA low-level driver");
mdev->limits.gid_table_len = dev_lim->max_gids;
mdev->limits.pkey_table_len = dev_lim->max_pkeys;
mdev->limits.local_ca_ack_delay = dev_lim->local_ca_ack_delay;
- mdev->limits.max_sg = dev_lim->max_sg;
+ /*
+ * Need to allow for worst case send WQE overhead and check
+ * whether max_desc_sz imposes a lower limit than max_sg; UD
+ * send has the biggest overhead.
+ */
+ mdev->limits.max_sg = min_t(int, dev_lim->max_sg,
+ (dev_lim->max_desc_sz -
+ sizeof (struct mthca_next_seg) -
+ (mthca_is_memfree(mdev) ?
+ sizeof (struct mthca_arbel_ud_seg) :
+ sizeof (struct mthca_tavor_ud_seg))) /
+ sizeof (struct mthca_data_seg));
mdev->limits.max_wqes = dev_lim->max_qp_sz;
mdev->limits.max_qp_init_rdma = dev_lim->max_requester_per_qp;
mdev->limits.reserved_qps = dev_lim->reserved_qps;