Release 4.8 drivers/net/ethernet/mellanox/mlx5/core/en_tx.c

/*
 * Copyright (c) 2015-2016, Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * 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.
 */

#include <linux/tcp.h>
#include <linux/if_vlan.h>
#include "en.h"


#define MLX5E_SQ_NOPS_ROOM  MLX5_SEND_WQE_MAX_WQEBBS

#define MLX5E_SQ_STOP_ROOM (MLX5_SEND_WQE_MAX_WQEBBS +\
                            MLX5E_SQ_NOPS_ROOM)



void mlx5e_send_nop(struct mlx5e_sq *sq, bool notify_hw)
{
	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 mlx5_wqe_ctrl_seg         *cseg = &wqe->ctrl;

	memset(cseg, 0, sizeof(*cseg));

	cseg->opmod_idx_opcode = cpu_to_be32((sq->pc << 8) | MLX5_OPCODE_NOP);
	cseg->qpn_ds           = cpu_to_be32((sq->sqn << 8) | 0x01);

	sq->skb[pi] = NULL;
	sq->pc++;
	sq->stats.nop++;

	if (notify_hw) {
		cseg->fm_ce_se = MLX5_WQE_CTRL_CQ_UPDATE;
		mlx5e_tx_notify_hw(sq, &wqe->ctrl, 0);
	}
}

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10
6.76%
2
50.00%
achiad shochat
achiad shochat
2
1.35%
1
25.00%
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148
100.00%
4
100.00%



static inline void mlx5e_tx_dma_unmap(struct device *pdev,
				      struct mlx5e_sq_dma *dma)
{
	switch (dma->type) {
	case MLX5E_DMA_MAP_SINGLE:
		dma_unmap_single(pdev, dma->addr, dma->size, DMA_TO_DEVICE);
		break;
	case MLX5E_DMA_MAP_PAGE:
		dma_unmap_page(pdev, dma->addr, dma->size, DMA_TO_DEVICE);
		break;
	default:
		WARN_ONCE(true, "mlx5e_tx_dma_unmap unknown DMA type!\n");
	}
}

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31
43.66%
1
50.00%
Total
71
100.00%
2
100.00%



static inline void mlx5e_dma_push(struct mlx5e_sq *sq,
				  dma_addr_t addr,
				  u32 size,
				  enum mlx5e_dma_map_type map_type)
{
	sq->dma_fifo[sq->dma_fifo_pc & sq->dma_fifo_mask].addr = addr;
	sq->dma_fifo[sq->dma_fifo_pc & sq->dma_fifo_mask].size = size;
	sq->dma_fifo[sq->dma_fifo_pc & sq->dma_fifo_mask].type = map_type;
	sq->dma_fifo_pc++;
}

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amir vadai
57
73.08%
1
50.00%
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21
26.92%
1
50.00%
Total
78
100.00%
2
100.00%



static inline struct mlx5e_sq_dma *mlx5e_dma_get(struct mlx5e_sq *sq, u32 i)
{
	return &sq->dma_fifo[i & sq->dma_fifo_mask];
}

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76.67%
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7
23.33%
1
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30
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2
100.00%



static void mlx5e_dma_unmap_wqe_err(struct mlx5e_sq *sq, u8 num_dma)
{
	int i;

	for (i = 0; i < num_dma; i++) {
		struct mlx5e_sq_dma *last_pushed_dma =
			mlx5e_dma_get(sq, --sq->dma_fifo_pc);

		mlx5e_tx_dma_unmap(sq->pdev, last_pushed_dma);
	}
}

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89.29%
2
66.67%
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amir vadai
6
10.71%
1
33.33%
Total
56
100.00%
3
100.00%



u16 mlx5e_select_queue(struct net_device *dev, struct sk_buff *skb,
		       void *accel_priv, select_queue_fallback_t fallback)
{
	struct mlx5e_priv *priv = netdev_priv(dev);
	int channel_ix = fallback(dev, skb);
	int up = 0;

	if (!netdev_get_num_tc(dev))
		return channel_ix;

	if (skb_vlan_tag_present(skb))
		up = skb->vlan_tci >> VLAN_PRIO_SHIFT;

	/* channel_ix can be larger than num_channels since
         * dev->num_real_tx_queues = num_channels * num_tc
         */
	if (channel_ix >= priv->params.num_channels)
		channel_ix = reciprocal_scale(channel_ix,
					      priv->params.num_channels);

	return priv->channeltc_to_txq_map[channel_ix][up];
}

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amir vadai
59
54.63%
1
20.00%
rana shahout
rana shahout
40
37.04%
2
40.00%
saeed mahameed
saeed mahameed
9
8.33%
2
40.00%
Total
108
100.00%
5
100.00%



static inline int mlx5e_skb_l2_header_offset(struct sk_buff *skb)
{

#define MLX5E_MIN_INLINE (ETH_HLEN + VLAN_HLEN)

	return max(skb_network_offset(skb), MLX5E_MIN_INLINE);
}

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1
100.00%



static inline int mlx5e_skb_l3_header_offset(struct sk_buff *skb)
{
	struct flow_keys keys;

	if (skb_transport_header_was_set(skb))
		return skb_transport_offset(skb);
	else if (skb_flow_dissect_flow_keys(skb, &keys, 0))
		return keys.control.thoff;
	else
		return mlx5e_skb_l2_header_offset(skb);
}

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static inline unsigned int mlx5e_calc_min_inline(enum mlx5_inline_modes mode,
						 struct sk_buff *skb)
{
	int hlen;

	switch (mode) {
	case MLX5_INLINE_MODE_TCP_UDP:
		hlen = eth_get_headlen(skb->data, skb_headlen(skb));
		if (hlen == ETH_HLEN && !skb_vlan_tag_present(skb))
			hlen += VLAN_HLEN;
		return hlen;
	case MLX5_INLINE_MODE_IP:
		/* When transport header is set to zero, it means no transport
                 * header. When transport header is set to 0xff's, it means
                 * transport header wasn't set.
                 */
		if (skb_transport_offset(skb))
			return mlx5e_skb_l3_header_offset(skb);
		/* fall through */
	case MLX5_INLINE_MODE_L2:
	default:
		return mlx5e_skb_l2_header_offset(skb);
	}
}

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90
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1
100.00%



static inline u16 mlx5e_get_inline_hdr_size(struct mlx5e_sq *sq,
					    struct sk_buff *skb, bool bf)
{
	/* Some NIC TX decisions, e.g loopback, are based on the packet
         * headers and occur before the data gather.
         * Therefore these headers must be copied into the WQE
         */
	if (bf) {
		u16 ihs = skb_headlen(skb);

		if (skb_vlan_tag_present(skb))
			ihs += VLAN_HLEN;

		if (ihs <= sq->max_inline)
			return skb_headlen(skb);
	}
	return mlx5e_calc_min_inline(sq->min_inline_mode, skb);
}

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achiad shochat
22
31.43%
2
33.33%
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saeed mahameed
21
30.00%
1
16.67%
amir vadai
amir vadai
19
27.14%
1
16.67%
hadar hen zion
hadar hen zion
5
7.14%
1
16.67%
matthew finlay
matthew finlay
3
4.29%
1
16.67%
Total
70
100.00%
6
100.00%



static inline void mlx5e_tx_skb_pull_inline(unsigned char **skb_data,
					    unsigned int *skb_len,
					    unsigned int len)
{
	*skb_len -= len;
	*skb_data += len;
}

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static inline void mlx5e_insert_vlan(void *start, struct sk_buff *skb, u16 ihs,
				     unsigned char **skb_data,
				     unsigned int *skb_len)
{
	struct vlan_ethhdr *vhdr = (struct vlan_ethhdr *)start;
	int cpy1_sz = 2 * ETH_ALEN;
	int cpy2_sz = ihs - cpy1_sz;

	memcpy(vhdr, *skb_data, cpy1_sz);
	mlx5e_tx_skb_pull_inline(skb_data, skb_len, cpy1_sz);
	vhdr->h_vlan_proto = skb->vlan_proto;
	vhdr->h_vlan_TCI = cpu_to_be16(skb_vlan_tag_get(skb));
	memcpy(&vhdr->h_vlan_encapsulated_proto, *skb_data, cpy2_sz);
	mlx5e_tx_skb_pull_inline(skb_data, skb_len, cpy2_sz);
}

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static netdev_tx_t mlx5e_sq_xmit(struct mlx5e_sq *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->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;
	bool bf = false;
	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) {
			eseg->cs_flags |= MLX5_ETH_WQE_L3_INNER_CSUM |
					  MLX5_ETH_WQE_L4_INNER_CSUM;
			sq->stats.csum_partial_inner++;
		} else {
			eseg->cs_flags |= MLX5_ETH_WQE_L4_CSUM;
		}
	} else
		sq->stats.csum_none++;

	if (sq->cc != sq->prev_cc) {
		sq->prev_cc = sq->cc;
		sq->bf_budget = (sq->cc == sq->pc) ? MLX5E_SQ_BF_BUDGET : 0;
	}

	if (skb_is_gso(skb)) {
		eseg->mss    = cpu_to_be16(skb_shinfo(skb)->gso_size);
		opcode       = MLX5_OPCODE_LSO;

		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;
		}

		num_bytes = skb->len + (skb_shinfo(skb)->gso_segs - 1) * ihs;
	} else {
		bf = sq->bf_budget &&
		     !skb->xmit_more &&
		     !skb_shinfo(skb)->nr_frags;
		ihs = mlx5e_get_inline_hdr_size(sq, skb, bf);
		num_bytes = max_t(unsigned int, skb->len, ETH_ZLEN);
	}

	wi->num_bytes = num_bytes;

	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  = sizeof(*wqe) / MLX5_SEND_WQE_DS;
	ds_cnt += DIV_ROUND_UP(ihs - sizeof(eseg->inline_hdr_start),
			       MLX5_SEND_WQE_DS);
	dseg    = (struct mlx5_wqe_data_seg *)cseg + ds_cnt;

	wi->num_dma = 0;

	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;

		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++;

		dseg++;
	}

	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
		struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i];
		int fsz = skb_frag_size(frag);

		dma_addr = skb_frag_dma_map(sq->pdev, frag, 0, fsz,
					    DMA_TO_DEVICE);
		if (unlikely(dma_mapping_error(sq->pdev, dma_addr)))
			goto dma_unmap_wqe_err;

		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++;

		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);

	sq->skb[pi] = skb;

	wi->num_wqebbs = DIV_ROUND_UP(ds_cnt, MLX5_SEND_WQEBB_NUM_DS);
	sq->pc += wi->num_wqebbs;

	netdev_tx_sent_queue(sq->txq, wi->num_bytes);

	if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;

	if (unlikely(!mlx5e_sq_has_room_for(sq, 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)) {
		int bf_sz = 0;

		if (bf && test_bit(MLX5E_SQ_STATE_BF_ENABLE, &sq->state))
			bf_sz = wi->num_wqebbs << 3;

		cseg->fm_ce_se = MLX5_WQE_CTRL_CQ_UPDATE;
		mlx5e_tx_notify_hw(sq, &wqe->ctrl, bf_sz);
	}

	/* fill sq edge with nops to avoid wqe wrap around */
	while ((sq->pc & wq->sz_m1) > sq->edge)
		mlx5e_send_nop(sq, false);

	if (bf)
		sq->bf_budget--;

	sq->stats.packets++;
	sq->stats.bytes += num_bytes;
	return NETDEV_TX_OK;

dma_unmap_wqe_err:
	sq->stats.dropped++;
	mlx5e_dma_unmap_wqe_err(sq, wi->num_dma);

	dev_kfree_skb_any(skb);

	return NETDEV_TX_OK;
}

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amir vadai
638
62.92%
1
5.56%
achiad shochat
achiad shochat
192
18.93%
6
33.33%
matthew finlay
matthew finlay
86
8.48%
2
11.11%
saeed mahameed
saeed mahameed
31
3.06%
2
11.11%
eran ben elisha
eran ben elisha
23
2.27%
1
5.56%
gal pressman
gal pressman
20
1.97%
2
11.11%
tariq toukan
tariq toukan
13
1.28%
2
11.11%
moshe lazer
moshe lazer
7
0.69%
1
5.56%
eli cohen
eli cohen
4
0.39%
1
5.56%
Total
1014
100.00%
18
100.00%



netdev_tx_t mlx5e_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct mlx5e_priv *priv = netdev_priv(dev);
	struct mlx5e_sq *sq = priv->txq_to_sq_map[skb_get_queue_mapping(skb)];

	return mlx5e_sq_xmit(sq, skb);
}

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93.75%
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3
6.25%
1
50.00%
Total
48
100.00%
2
100.00%



bool mlx5e_poll_tx_cq(struct mlx5e_cq *cq, int napi_budget)
{
	struct mlx5e_sq *sq;
	u32 dma_fifo_cc;
	u32 nbytes;
	u16 npkts;
	u16 sqcc;
	int i;

	sq = container_of(cq, struct mlx5e_sq, cq);

	if (unlikely(test_bit(MLX5E_SQ_STATE_FLUSH, &sq->state)))
		return false;

	npkts = 0;
	nbytes = 0;

	/* sq->cc must be updated only after mlx5_cqwq_update_db_record(),
         * otherwise a cq overrun may occur
         */
	sqcc = sq->cc;

	/* avoid dirtying sq cache line every cqe */
	dma_fifo_cc = sq->dma_fifo_cc;

	for (i = 0; i < MLX5E_TX_CQ_POLL_BUDGET; i++) {
		struct mlx5_cqe64 *cqe;
		u16 wqe_counter;
		bool last_wqe;

		cqe = mlx5e_get_cqe(cq);
		if (!cqe)
			break;

		mlx5_cqwq_pop(&cq->wq);

		wqe_counter = be16_to_cpu(cqe->wqe_counter);

		do {
			struct mlx5e_tx_wqe_info *wi;
			struct sk_buff *skb;
			u16 ci;
			int j;

			last_wqe = (sqcc == wqe_counter);

			ci = sqcc & sq->wq.sz_m1;
			skb = sq->skb[ci];
			wi = &sq->wqe_info[ci];

			if (unlikely(!skb)) { /* nop */
				sqcc++;
				continue;
			}

			if (unlikely(skb_shinfo(skb)->tx_flags &
				     SKBTX_HW_TSTAMP)) {
				struct skb_shared_hwtstamps hwts = {};

				mlx5e_fill_hwstamp(sq->tstamp,
						   get_cqe_ts(cqe), &hwts);
				skb_tstamp_tx(skb, &hwts);
			}

			for (j = 0; j < wi->num_dma; j++) {
				struct mlx5e_sq_dma *dma =
					mlx5e_dma_get(sq, dma_fifo_cc++);

				mlx5e_tx_dma_unmap(sq->pdev, dma);
			}

			npkts++;
			nbytes += wi->num_bytes;
			sqcc += wi->num_wqebbs;
			napi_consume_skb(skb, napi_budget);
		} while (!last_wqe);
	}

	mlx5_cqwq_update_db_record(&cq->wq);

	/* ensure cq space is freed before enabling more cqes */
	wmb();

	sq->dma_fifo_cc = dma_fifo_cc;
	sq->cc = sqcc;

	netdev_tx_completed_queue(sq->txq, npkts, nbytes);

	if (netif_tx_queue_stopped(sq->txq) &&
	    mlx5e_sq_has_room_for(sq, MLX5E_SQ_STOP_ROOM)) {
		netif_tx_wake_queue(sq->txq);
		sq->stats.wake++;
	}

	return (i == MLX5E_TX_CQ_POLL_BUDGET);
}

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6
46.15%
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eran ben elisha
45
11.31%
1
7.69%
daniel jurgens
daniel jurgens
17
4.27%
1
7.69%
jesper dangaard brouer
jesper dangaard brouer
6
1.51%
1
7.69%
tariq toukan
tariq toukan
3
0.75%
1
7.69%
saeed mahameed
saeed mahameed
2
0.50%
2
15.38%
Total
398
100.00%
13
100.00%



void mlx5e_free_tx_descs(struct mlx5e_sq *sq)
{
	struct mlx5e_tx_wqe_info *wi;
	struct sk_buff *skb;
	u16 ci;
	int i;

	while (sq->cc != sq->pc) {
		ci = sq->cc & sq->wq.sz_m1;
		skb = sq->skb[ci];
		wi = &sq->wqe_info[ci];

		if (!skb) { /* nop */
			sq->cc++;
			continue;
		}

		for (i = 0; i < wi->num_dma; i++) {
			struct mlx5e_sq_dma *dma =
				mlx5e_dma_get(sq, sq->dma_fifo_cc++);

			mlx5e_tx_dma_unmap(sq->pdev, dma);
		}

		dev_kfree_skb_any(skb);
		sq->cc += wi->num_wqebbs;
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
saeed mahameed
saeed mahameed
137
100.00%
1
100.00%
Total
137
100.00%
1
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
amir vadai
amir vadai
1128
45.16%
1
2.94%
achiad shochat
achiad shochat
567
22.70%
10
29.41%
saeed mahameed
saeed mahameed
347
13.89%
6
17.65%
hadar hen zion
hadar hen zion
178
7.13%
1
2.94%
matthew finlay
matthew finlay
90
3.60%
3
8.82%
eran ben elisha
eran ben elisha
68
2.72%
1
2.94%
rana shahout
rana shahout
40
1.60%
2
5.88%
tariq toukan
tariq toukan
26
1.04%
4
11.76%
gal pressman
gal pressman
20
0.80%
2
5.88%
daniel jurgens
daniel jurgens
17
0.68%
1
2.94%
moshe lazer
moshe lazer
7
0.28%
1
2.94%
jesper dangaard brouer
jesper dangaard brouer
6
0.24%
1
2.94%
eli cohen
eli cohen
4
0.16%
1
2.94%
Total
2498
100.00%
34
100.00%
  
Directory: drivers/net/ethernet/mellanox/mlx5/core

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