net/mlx5: WQ, fixes for fragmented WQ buffers API
mlx5e netdevice used to calculate fragment edges by a call to
mlx5_wq_cyc_get_frag_size(). This calculation did not give the correct
indication for queues smaller than a PAGE_SIZE, (broken by default on
PowerPC, where PAGE_SIZE == 64KB). Here it is replaced by the correct new
calls/API.
Since (TX/RX) Work Queues buffers are fragmented, here we introduce
changes to the API in core driver, so that it gets a stride index and
returns the index of last stride on same fragment, and an additional
wrapping function that returns the number of physically contiguous
strides that can be written contiguously to the work queue.
This obsoletes the following API functions, and their buggy
usage in EN driver:
* mlx5_wq_cyc_get_frag_size()
* mlx5_wq_cyc_ctr2fragix()
The new API improves modularity and hides the details of such
calculation for mlx5e netdevice and mlx5_ib rdma drivers.
New calculation is also more efficient, and improves performance
as follows:
Packet rate test: pktgen, UDP / IPv4, 64byte, single ring, 8K ring size.
Before: 16,477,619 pps
After: 17,085,793 pps
3.7% improvement
Fixes: 3a2f70331226 ("net/mlx5: Use order-0 allocations for all WQ types")
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Reviewed-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index 15d8ae2..00172de 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -432,10 +432,9 @@
static inline void mlx5e_fill_icosq_frag_edge(struct mlx5e_icosq *sq,
struct mlx5_wq_cyc *wq,
- u16 pi, u16 frag_pi)
+ u16 pi, u16 nnops)
{
struct mlx5e_sq_wqe_info *edge_wi, *wi = &sq->db.ico_wqe[pi];
- u8 nnops = mlx5_wq_cyc_get_frag_size(wq) - frag_pi;
edge_wi = wi + nnops;
@@ -454,15 +453,14 @@
struct mlx5_wq_cyc *wq = &sq->wq;
struct mlx5e_umr_wqe *umr_wqe;
u16 xlt_offset = ix << (MLX5E_LOG_ALIGNED_MPWQE_PPW - 1);
- u16 pi, frag_pi;
+ u16 pi, contig_wqebbs_room;
int err;
int i;
pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
- frag_pi = mlx5_wq_cyc_ctr2fragix(wq, sq->pc);
-
- if (unlikely(frag_pi + MLX5E_UMR_WQEBBS > mlx5_wq_cyc_get_frag_size(wq))) {
- mlx5e_fill_icosq_frag_edge(sq, wq, pi, frag_pi);
+ contig_wqebbs_room = mlx5_wq_cyc_get_contig_wqebbs(wq, pi);
+ if (unlikely(contig_wqebbs_room < MLX5E_UMR_WQEBBS)) {
+ mlx5e_fill_icosq_frag_edge(sq, wq, pi, contig_wqebbs_room);
pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
index ae73ea9..6dacaeb 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
@@ -290,10 +290,9 @@
static inline void mlx5e_fill_sq_frag_edge(struct mlx5e_txqsq *sq,
struct mlx5_wq_cyc *wq,
- u16 pi, u16 frag_pi)
+ u16 pi, u16 nnops)
{
struct mlx5e_tx_wqe_info *edge_wi, *wi = &sq->db.wqe_info[pi];
- u8 nnops = mlx5_wq_cyc_get_frag_size(wq) - frag_pi;
edge_wi = wi + nnops;
@@ -348,8 +347,8 @@
struct mlx5e_tx_wqe_info *wi;
struct mlx5e_sq_stats *stats = sq->stats;
+ u16 headlen, ihs, contig_wqebbs_room;
u16 ds_cnt, ds_cnt_inl = 0;
- u16 headlen, ihs, frag_pi;
u8 num_wqebbs, opcode;
u32 num_bytes;
int num_dma;
@@ -386,9 +385,9 @@
}
num_wqebbs = DIV_ROUND_UP(ds_cnt, MLX5_SEND_WQEBB_NUM_DS);
- frag_pi = mlx5_wq_cyc_ctr2fragix(wq, sq->pc);
- if (unlikely(frag_pi + num_wqebbs > mlx5_wq_cyc_get_frag_size(wq))) {
- mlx5e_fill_sq_frag_edge(sq, wq, pi, frag_pi);
+ contig_wqebbs_room = mlx5_wq_cyc_get_contig_wqebbs(wq, pi);
+ if (unlikely(contig_wqebbs_room < num_wqebbs)) {
+ mlx5e_fill_sq_frag_edge(sq, wq, pi, contig_wqebbs_room);
mlx5e_sq_fetch_wqe(sq, &wqe, &pi);
}
@@ -636,7 +635,7 @@
struct mlx5e_tx_wqe_info *wi;
struct mlx5e_sq_stats *stats = sq->stats;
- u16 headlen, ihs, pi, frag_pi;
+ u16 headlen, ihs, pi, contig_wqebbs_room;
u16 ds_cnt, ds_cnt_inl = 0;
u8 num_wqebbs, opcode;
u32 num_bytes;
@@ -672,13 +671,14 @@
}
num_wqebbs = DIV_ROUND_UP(ds_cnt, MLX5_SEND_WQEBB_NUM_DS);
- frag_pi = mlx5_wq_cyc_ctr2fragix(wq, sq->pc);
- if (unlikely(frag_pi + num_wqebbs > mlx5_wq_cyc_get_frag_size(wq))) {
+ pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
+ contig_wqebbs_room = mlx5_wq_cyc_get_contig_wqebbs(wq, pi);
+ if (unlikely(contig_wqebbs_room < num_wqebbs)) {
+ mlx5e_fill_sq_frag_edge(sq, wq, pi, contig_wqebbs_room);
pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
- mlx5e_fill_sq_frag_edge(sq, wq, pi, frag_pi);
}
- mlx5i_sq_fetch_wqe(sq, &wqe, &pi);
+ mlx5i_sq_fetch_wqe(sq, &wqe, pi);
/* fill wqe */
wi = &sq->db.wqe_info[pi];
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.h b/drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.h
index 08eac92..0982c57 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.h
@@ -109,12 +109,11 @@
static inline void mlx5i_sq_fetch_wqe(struct mlx5e_txqsq *sq,
struct mlx5i_tx_wqe **wqe,
- u16 *pi)
+ u16 pi)
{
struct mlx5_wq_cyc *wq = &sq->wq;
- *pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
- *wqe = mlx5_wq_cyc_get_wqe(wq, *pi);
+ *wqe = mlx5_wq_cyc_get_wqe(wq, pi);
memset(*wqe, 0, sizeof(**wqe));
}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/wq.c b/drivers/net/ethernet/mellanox/mlx5/core/wq.c
index 68e7f8d..ddca327 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/wq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/wq.c
@@ -39,11 +39,6 @@
return (u32)wq->fbc.sz_m1 + 1;
}
-u16 mlx5_wq_cyc_get_frag_size(struct mlx5_wq_cyc *wq)
-{
- return wq->fbc.frag_sz_m1 + 1;
-}
-
u32 mlx5_cqwq_get_size(struct mlx5_cqwq *wq)
{
return wq->fbc.sz_m1 + 1;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/wq.h b/drivers/net/ethernet/mellanox/mlx5/core/wq.h
index 3a1a170..b1293d1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/wq.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/wq.h
@@ -80,7 +80,6 @@
void *wqc, struct mlx5_wq_cyc *wq,
struct mlx5_wq_ctrl *wq_ctrl);
u32 mlx5_wq_cyc_get_size(struct mlx5_wq_cyc *wq);
-u16 mlx5_wq_cyc_get_frag_size(struct mlx5_wq_cyc *wq);
int mlx5_wq_qp_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
void *qpc, struct mlx5_wq_qp *wq,
@@ -140,11 +139,6 @@
return ctr & wq->fbc.sz_m1;
}
-static inline u16 mlx5_wq_cyc_ctr2fragix(struct mlx5_wq_cyc *wq, u16 ctr)
-{
- return ctr & wq->fbc.frag_sz_m1;
-}
-
static inline u16 mlx5_wq_cyc_get_head(struct mlx5_wq_cyc *wq)
{
return mlx5_wq_cyc_ctr2ix(wq, wq->wqe_ctr);
@@ -160,6 +154,11 @@
return mlx5_frag_buf_get_wqe(&wq->fbc, ix);
}
+static inline u16 mlx5_wq_cyc_get_contig_wqebbs(struct mlx5_wq_cyc *wq, u16 ix)
+{
+ return mlx5_frag_buf_get_idx_last_contig_stride(&wq->fbc, ix) - ix + 1;
+}
+
static inline int mlx5_wq_cyc_cc_bigger(u16 cc1, u16 cc2)
{
int equal = (cc1 == cc2);
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index 66d94b4..88a041b 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -1032,6 +1032,14 @@
((fbc->frag_sz_m1 & ix) << fbc->log_stride);
}
+static inline u32
+mlx5_frag_buf_get_idx_last_contig_stride(struct mlx5_frag_buf_ctrl *fbc, u32 ix)
+{
+ u32 last_frag_stride_idx = (ix + fbc->strides_offset) | fbc->frag_sz_m1;
+
+ return min_t(u32, last_frag_stride_idx - fbc->strides_offset, fbc->sz_m1);
+}
+
int mlx5_cmd_init(struct mlx5_core_dev *dev);
void mlx5_cmd_cleanup(struct mlx5_core_dev *dev);
void mlx5_cmd_use_events(struct mlx5_core_dev *dev);
