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Date: Thu, 13 Apr 2017 06:37:01 +0300
From: Saeed Mahameed <saeedm@...lanox.com>
To: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc: linux-rdma@...r.kernel.org, Doug Ledford <dledford@...hat.com>,
Leon Romanovsky <leonro@...lanox.com>,
Erez Shitrit <erezsh@...lanox.com>,
Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
Vishwanathapura Niranjana <niranjana.vishwanathapura@...el.com>,
Saeed Mahameed <saeedm@...lanox.com>
Subject: [PATCH net-next 11/16] net/mlx5e: Xmit flow break down
Break current mlx5e xmit flow into smaller blocks (helper functions)
in order to reuse them for IPoIB SKB transmission.
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
Reviewed-by: Erez Shitrit <erezsh@...lanox.com>
---
drivers/net/ethernet/mellanox/mlx5/core/en.h | 2 +-
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 7 +-
drivers/net/ethernet/mellanox/mlx5/core/en_tx.c | 199 +++++++++++++---------
3 files changed, 119 insertions(+), 89 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index 23b92ec54e12..25185f8c3562 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -304,6 +304,7 @@ struct mlx5e_cq {
} ____cacheline_aligned_in_smp;
struct mlx5e_tx_wqe_info {
+ struct sk_buff *skb;
u32 num_bytes;
u8 num_wqebbs;
u8 num_dma;
@@ -345,7 +346,6 @@ struct mlx5e_txqsq {
/* write@...t, read@...pletion */
struct {
- struct sk_buff **skb;
struct mlx5e_sq_dma *dma_fifo;
struct mlx5e_tx_wqe_info *wqe_info;
} db;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index eb657987e9b5..2201b7ea05f4 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -1042,7 +1042,6 @@ static void mlx5e_free_txqsq_db(struct mlx5e_txqsq *sq)
{
kfree(sq->db.wqe_info);
kfree(sq->db.dma_fifo);
- kfree(sq->db.skb);
}
static int mlx5e_alloc_txqsq_db(struct mlx5e_txqsq *sq, int numa)
@@ -1050,13 +1049,11 @@ static int mlx5e_alloc_txqsq_db(struct mlx5e_txqsq *sq, int numa)
int wq_sz = mlx5_wq_cyc_get_size(&sq->wq);
int df_sz = wq_sz * MLX5_SEND_WQEBB_NUM_DS;
- sq->db.skb = kzalloc_node(wq_sz * sizeof(*sq->db.skb),
- GFP_KERNEL, numa);
sq->db.dma_fifo = kzalloc_node(df_sz * sizeof(*sq->db.dma_fifo),
GFP_KERNEL, numa);
sq->db.wqe_info = kzalloc_node(wq_sz * sizeof(*sq->db.wqe_info),
GFP_KERNEL, numa);
- if (!sq->db.skb || !sq->db.dma_fifo || !sq->db.wqe_info) {
+ if (!sq->db.dma_fifo || !sq->db.wqe_info) {
mlx5e_free_txqsq_db(sq);
return -ENOMEM;
}
@@ -1295,7 +1292,7 @@ static void mlx5e_deactivate_txqsq(struct mlx5e_txqsq *sq)
if (mlx5e_wqc_has_room_for(&sq->wq, sq->cc, sq->pc, 1)) {
struct mlx5e_tx_wqe *nop;
- sq->db.skb[(sq->pc & sq->wq.sz_m1)] = NULL;
+ sq->db.wqe_info[(sq->pc & sq->wq.sz_m1)].skb = NULL;
nop = mlx5e_post_nop(&sq->wq, sq->sqn, &sq->pc);
mlx5e_notify_hw(&sq->wq, sq->pc, sq->uar_map, &nop->ctrl);
}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
index 5bbc313e70c5..ba664a1126cf 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
@@ -177,30 +177,9 @@ static inline void mlx5e_insert_vlan(void *start, struct sk_buff *skb, u16 ihs,
mlx5e_tx_skb_pull_inline(skb_data, skb_len, cpy2_sz);
}
-static netdev_tx_t mlx5e_sq_xmit(struct mlx5e_txqsq *sq, struct sk_buff *skb)
+static inline void
+mlx5e_txwqe_build_eseg_csum(struct mlx5e_txqsq *sq, struct sk_buff *skb, struct mlx5_wqe_eth_seg *eseg)
{
- struct mlx5_wq_cyc *wq = &sq->wq;
-
- u16 pi = sq->pc & wq->sz_m1;
- struct mlx5e_tx_wqe *wqe = mlx5_wq_cyc_get_wqe(wq, pi);
- struct mlx5e_tx_wqe_info *wi = &sq->db.wqe_info[pi];
-
- struct mlx5_wqe_ctrl_seg *cseg = &wqe->ctrl;
- struct mlx5_wqe_eth_seg *eseg = &wqe->eth;
- struct mlx5_wqe_data_seg *dseg;
-
- unsigned char *skb_data = skb->data;
- unsigned int skb_len = skb->len;
- u8 opcode = MLX5_OPCODE_SEND;
- dma_addr_t dma_addr = 0;
- unsigned int num_bytes;
- u16 headlen;
- u16 ds_cnt;
- u16 ihs;
- int i;
-
- memset(wqe, 0, sizeof(*wqe));
-
if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
eseg->cs_flags = MLX5_ETH_WQE_L3_CSUM;
if (skb->encapsulation) {
@@ -212,66 +191,51 @@ static netdev_tx_t mlx5e_sq_xmit(struct mlx5e_txqsq *sq, struct sk_buff *skb)
}
} else
sq->stats.csum_none++;
+}
- if (skb_is_gso(skb)) {
- eseg->mss = cpu_to_be16(skb_shinfo(skb)->gso_size);
- opcode = MLX5_OPCODE_LSO;
+static inline u16
+mlx5e_txwqe_build_eseg_gso(struct mlx5e_txqsq *sq, struct sk_buff *skb,
+ struct mlx5_wqe_eth_seg *eseg, unsigned int *num_bytes)
+{
+ u16 ihs;
- if (skb->encapsulation) {
- ihs = skb_inner_transport_offset(skb) + inner_tcp_hdrlen(skb);
- sq->stats.tso_inner_packets++;
- sq->stats.tso_inner_bytes += skb->len - ihs;
- } else {
- ihs = skb_transport_offset(skb) + tcp_hdrlen(skb);
- sq->stats.tso_packets++;
- sq->stats.tso_bytes += skb->len - ihs;
- }
+ eseg->mss = cpu_to_be16(skb_shinfo(skb)->gso_size);
- sq->stats.packets += skb_shinfo(skb)->gso_segs;
- num_bytes = skb->len + (skb_shinfo(skb)->gso_segs - 1) * ihs;
+ if (skb->encapsulation) {
+ ihs = skb_inner_transport_offset(skb) + inner_tcp_hdrlen(skb);
+ sq->stats.tso_inner_packets++;
+ sq->stats.tso_inner_bytes += skb->len - ihs;
} else {
- ihs = mlx5e_calc_min_inline(sq->min_inline_mode, skb);
- sq->stats.packets++;
- num_bytes = max_t(unsigned int, skb->len, ETH_ZLEN);
+ ihs = skb_transport_offset(skb) + tcp_hdrlen(skb);
+ sq->stats.tso_packets++;
+ sq->stats.tso_bytes += skb->len - ihs;
}
- sq->stats.bytes += num_bytes;
- wi->num_bytes = num_bytes;
-
- ds_cnt = sizeof(*wqe) / MLX5_SEND_WQE_DS;
- if (ihs) {
- if (skb_vlan_tag_present(skb)) {
- mlx5e_insert_vlan(eseg->inline_hdr.start, skb, ihs, &skb_data, &skb_len);
- ihs += VLAN_HLEN;
- } else {
- memcpy(eseg->inline_hdr.start, skb_data, ihs);
- mlx5e_tx_skb_pull_inline(&skb_data, &skb_len, ihs);
- }
- eseg->inline_hdr.sz = cpu_to_be16(ihs);
- ds_cnt += DIV_ROUND_UP(ihs - sizeof(eseg->inline_hdr.start), MLX5_SEND_WQE_DS);
- } else if (skb_vlan_tag_present(skb)) {
- eseg->insert.type = cpu_to_be16(MLX5_ETH_WQE_INSERT_VLAN);
- eseg->insert.vlan_tci = cpu_to_be16(skb_vlan_tag_get(skb));
- }
-
- dseg = (struct mlx5_wqe_data_seg *)cseg + ds_cnt;
+ *num_bytes = skb->len + (skb_shinfo(skb)->gso_segs - 1) * ihs;
+ return ihs;
+}
- wi->num_dma = 0;
+static inline int
+mlx5e_txwqe_build_dsegs(struct mlx5e_txqsq *sq, struct sk_buff *skb,
+ unsigned char *skb_data, u16 headlen,
+ struct mlx5_wqe_data_seg *dseg)
+{
+ dma_addr_t dma_addr = 0;
+ u8 num_dma = 0;
+ int i;
- headlen = skb_len - skb->data_len;
if (headlen) {
dma_addr = dma_map_single(sq->pdev, skb_data, headlen,
DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(sq->pdev, dma_addr)))
- goto dma_unmap_wqe_err;
+ return -ENOMEM;
dseg->addr = cpu_to_be64(dma_addr);
dseg->lkey = sq->mkey_be;
dseg->byte_count = cpu_to_be32(headlen);
mlx5e_dma_push(sq, dma_addr, headlen, MLX5E_DMA_MAP_SINGLE);
- wi->num_dma++;
-
+ num_dma++;
dseg++;
}
@@ -280,51 +244,120 @@ static netdev_tx_t mlx5e_sq_xmit(struct mlx5e_txqsq *sq, struct sk_buff *skb)
int fsz = skb_frag_size(frag);
dma_addr = skb_frag_dma_map(sq->pdev, frag, 0, fsz,
- DMA_TO_DEVICE);
+ DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(sq->pdev, dma_addr)))
- goto dma_unmap_wqe_err;
+ return -ENOMEM;
dseg->addr = cpu_to_be64(dma_addr);
dseg->lkey = sq->mkey_be;
dseg->byte_count = cpu_to_be32(fsz);
mlx5e_dma_push(sq, dma_addr, fsz, MLX5E_DMA_MAP_PAGE);
- wi->num_dma++;
-
+ num_dma++;
dseg++;
}
- ds_cnt += wi->num_dma;
-
- cseg->opmod_idx_opcode = cpu_to_be32((sq->pc << 8) | opcode);
- cseg->qpn_ds = cpu_to_be32((sq->sqn << 8) | ds_cnt);
+ return num_dma;
+}
- sq->db.skb[pi] = skb;
+static inline void
+mlx5e_txwqe_complete(struct mlx5e_txqsq *sq, struct sk_buff *skb,
+ u8 opcode, u16 ds_cnt, u32 num_bytes, u8 num_dma,
+ struct mlx5e_tx_wqe_info *wi, struct mlx5_wqe_ctrl_seg *cseg)
+{
+ struct mlx5_wq_cyc *wq = &sq->wq;
+ u16 pi;
+ wi->num_bytes = num_bytes;
+ wi->num_dma = num_dma;
wi->num_wqebbs = DIV_ROUND_UP(ds_cnt, MLX5_SEND_WQEBB_NUM_DS);
- sq->pc += wi->num_wqebbs;
+ wi->skb = skb;
- netdev_tx_sent_queue(sq->txq, wi->num_bytes);
+ cseg->opmod_idx_opcode = cpu_to_be32((sq->pc << 8) | opcode);
+ cseg->qpn_ds = cpu_to_be32((sq->sqn << 8) | ds_cnt);
+
+ netdev_tx_sent_queue(sq->txq, num_bytes);
if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
- if (unlikely(!mlx5e_wqc_has_room_for(&sq->wq, sq->cc, sq->pc,
- MLX5E_SQ_STOP_ROOM))) {
+ sq->pc += wi->num_wqebbs;
+ if (unlikely(!mlx5e_wqc_has_room_for(wq, sq->cc, sq->pc, MLX5E_SQ_STOP_ROOM))) {
netif_tx_stop_queue(sq->txq);
sq->stats.stopped++;
}
- sq->stats.xmit_more += skb->xmit_more;
if (!skb->xmit_more || netif_xmit_stopped(sq->txq))
mlx5e_notify_hw(wq, sq->pc, sq->uar_map, cseg);
/* fill sq edge with nops to avoid wqe wrap around */
while ((pi = (sq->pc & wq->sz_m1)) > sq->edge) {
- sq->db.skb[pi] = NULL;
- mlx5e_post_nop(&sq->wq, sq->sqn, &sq->pc);
+ sq->db.wqe_info[pi].skb = NULL;
+ mlx5e_post_nop(wq, sq->sqn, &sq->pc);
sq->stats.nop++;
}
+}
+
+static netdev_tx_t mlx5e_sq_xmit(struct mlx5e_txqsq *sq, struct sk_buff *skb)
+{
+ struct mlx5_wq_cyc *wq = &sq->wq;
+
+ u16 pi = sq->pc & wq->sz_m1;
+ struct mlx5e_tx_wqe *wqe = mlx5_wq_cyc_get_wqe(wq, pi);
+ struct mlx5e_tx_wqe_info *wi = &sq->db.wqe_info[pi];
+
+ struct mlx5_wqe_ctrl_seg *cseg = &wqe->ctrl;
+ struct mlx5_wqe_eth_seg *eseg = &wqe->eth;
+
+ unsigned char *skb_data = skb->data;
+ unsigned int skb_len = skb->len;
+ u8 opcode = MLX5_OPCODE_SEND;
+ unsigned int num_bytes;
+ int num_dma;
+ u16 headlen;
+ u16 ds_cnt;
+ u16 ihs;
+
+ memset(wqe, 0, sizeof(*wqe));
+
+ mlx5e_txwqe_build_eseg_csum(sq, skb, eseg);
+
+ if (skb_is_gso(skb)) {
+ opcode = MLX5_OPCODE_LSO;
+ ihs = mlx5e_txwqe_build_eseg_gso(sq, skb, eseg, &num_bytes);
+ sq->stats.packets += skb_shinfo(skb)->gso_segs;
+ } else {
+ ihs = mlx5e_calc_min_inline(sq->min_inline_mode, skb);
+ num_bytes = max_t(unsigned int, skb->len, ETH_ZLEN);
+ sq->stats.packets++;
+ }
+ sq->stats.bytes += num_bytes;
+ sq->stats.xmit_more += skb->xmit_more;
+
+ ds_cnt = sizeof(*wqe) / MLX5_SEND_WQE_DS;
+ if (ihs) {
+ if (skb_vlan_tag_present(skb)) {
+ mlx5e_insert_vlan(eseg->inline_hdr.start, skb, ihs, &skb_data, &skb_len);
+ ihs += VLAN_HLEN;
+ } else {
+ memcpy(eseg->inline_hdr.start, skb_data, ihs);
+ mlx5e_tx_skb_pull_inline(&skb_data, &skb_len, ihs);
+ }
+ eseg->inline_hdr.sz = cpu_to_be16(ihs);
+ ds_cnt += DIV_ROUND_UP(ihs - sizeof(eseg->inline_hdr.start), MLX5_SEND_WQE_DS);
+ } else if (skb_vlan_tag_present(skb)) {
+ eseg->insert.type = cpu_to_be16(MLX5_ETH_WQE_INSERT_VLAN);
+ eseg->insert.vlan_tci = cpu_to_be16(skb_vlan_tag_get(skb));
+ }
+
+ headlen = skb_len - skb->data_len;
+ num_dma = mlx5e_txwqe_build_dsegs(sq, skb, skb_data, headlen,
+ (struct mlx5_wqe_data_seg *)cseg + ds_cnt);
+ if (unlikely(num_dma < 0))
+ goto dma_unmap_wqe_err;
+
+ mlx5e_txwqe_complete(sq, skb, opcode, ds_cnt + num_dma,
+ num_bytes, num_dma, wi, cseg);
return NETDEV_TX_OK;
@@ -392,8 +425,8 @@ bool mlx5e_poll_tx_cq(struct mlx5e_cq *cq, int napi_budget)
last_wqe = (sqcc == wqe_counter);
ci = sqcc & sq->wq.sz_m1;
- skb = sq->db.skb[ci];
wi = &sq->db.wqe_info[ci];
+ skb = wi->skb;
if (unlikely(!skb)) { /* nop */
sqcc++;
@@ -451,8 +484,8 @@ void mlx5e_free_txqsq_descs(struct mlx5e_txqsq *sq)
while (sq->cc != sq->pc) {
ci = sq->cc & sq->wq.sz_m1;
- skb = sq->db.skb[ci];
wi = &sq->db.wqe_info[ci];
+ skb = wi->skb;
if (!skb) { /* nop */
sq->cc++;
--
2.11.0
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