net/mlx5e: Add control path for SHAMPO feature

This commit introduces the control path infrastructure for SHAMPO feature.

SHAMPO feature enables packet stitching by splitting packets to
header and payload, the header is placed on a dedicated buffer
and the payload on the RX ring, this allows stitching the data part
of a flow together continuously in the receive buffer.

SHAMPO feature is implemented as linked list striding RQ feature.
To support packets splitting and payload stitching:
- Enlarge the ICOSQ and the correspond CQ to support the header buffer
  memory regions.
- Add support to create linked list striding RQ with SHAMPO feature set
  in the open_rq function.
- Add deallocation function and corresponded calls for SHAMPO header
  buffer.
- Add mlx5e_create_umr_klm_mkey to support KLM mkey for the header
  buffer.
- Rename mlx5e_create_umr_mkey to mlx5e_create_umr_mtt_mkey.

Signed-off-by: Ben Ben-Ishay <benishay@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index 29a6586ef28d..397a4e769076 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -558,6 +558,44 @@ err:
 	return err;
 }
 
+/* This function is responsible to dealloc SHAMPO header buffer.
+ * close == true specifies that we are in the middle of closing RQ operation so
+ * we go over all the entries and if they are not in use we free them,
+ * otherwise we only go over a specific range inside the header buffer that are
+ * not in use.
+ */
+void mlx5e_shampo_dealloc_hd(struct mlx5e_rq *rq, u16 len, u16 start, bool close)
+{
+	struct mlx5e_shampo_hd *shampo = rq->mpwqe.shampo;
+	int hd_per_wq = shampo->hd_per_wq;
+	struct page *deleted_page = NULL;
+	struct mlx5e_dma_info *hd_info;
+	int i, index = start;
+
+	for (i = 0; i < len; i++, index++) {
+		if (index == hd_per_wq)
+			index = 0;
+
+		if (close && !test_bit(index, shampo->bitmap))
+			continue;
+
+		hd_info = &shampo->info[index];
+		hd_info->addr = ALIGN_DOWN(hd_info->addr, PAGE_SIZE);
+		if (hd_info->page != deleted_page) {
+			deleted_page = hd_info->page;
+			mlx5e_page_release(rq, hd_info, false);
+		}
+	}
+
+	if (start + len > hd_per_wq) {
+		len -= hd_per_wq - start;
+		bitmap_clear(shampo->bitmap, start, hd_per_wq - start);
+		start = 0;
+	}
+
+	bitmap_clear(shampo->bitmap, start, len);
+}
+
 static void mlx5e_dealloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
 {
 	struct mlx5e_mpw_info *wi = &rq->mpwqe.info[ix];