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bnxt_en: add support for rx-copybreak ethtool command

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The bnxt_en driver supports rx-copybreak, but it couldn't be set by
userspace. Only the default value(256) has worked.
This patch makes the bnxt_en driver support following command.
`ethtool --set-tunable <devname> rx-copybreak <value> ` and
`ethtool --get-tunable <devname> rx-copybreak`.

By this patch, hds_threshol is set to the rx-copybreak value.
But it will be set by `ethtool -G eth0 hds-thresh N`
in the next patch.

Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Brett Creeley <brett.creeley@amd.com>
Tested-by: Stanislav Fomichev <sdf@fomichev.me>
Tested-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Link: https://patch.msgid.link/20250114142852.3364986-7-ap420073@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Taehee Yoo 2025-01-14 14:28:48 +00:00 • committed by Jakub Kicinski
parent 2d46e481a9
commit 152f4da05a
3 changed files with 63 additions and 14 deletions
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28
drivers/net/ethernet/broadcom/bnxt/bnxt.c
View file

@ -81,7 +81,6 @@ MODULE_DESCRIPTION("Broadcom NetXtreme network driver");
#define BNXT_RX_OFFSET (NET_SKB_PAD + NET_IP_ALIGN)
#define BNXT_RX_DMA_OFFSET NET_SKB_PAD
#define BNXT_RX_COPY_THRESH 256
#define BNXT_TX_PUSH_THRESH 164
@ -1343,13 +1342,13 @@ static struct sk_buff *bnxt_copy_data(struct bnxt_napi *bnapi, u8 *data,
if (!skb)
return NULL;
dma_sync_single_for_cpu(&pdev->dev, mapping, bp->rx_copy_thresh,
dma_sync_single_for_cpu(&pdev->dev, mapping, bp->rx_copybreak,
bp->rx_dir);
memcpy(skb->data - NET_IP_ALIGN, data - NET_IP_ALIGN,
len + NET_IP_ALIGN);
dma_sync_single_for_device(&pdev->dev, mapping, bp->rx_copy_thresh,
dma_sync_single_for_device(&pdev->dev, mapping, bp->rx_copybreak,
bp->rx_dir);
skb_put(skb, len);
@ -1842,7 +1841,7 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt *bp,
return NULL;
}
if (len <= bp->rx_copy_thresh) {
if (len <= bp->rx_copybreak) {
skb = bnxt_copy_skb(bnapi, data_ptr, len, mapping);
if (!skb) {
bnxt_abort_tpa(cpr, idx, agg_bufs);
@ -2176,7 +2175,7 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
}
}
if (len <= bp->rx_copy_thresh) {
if (len <= bp->rx_copybreak) {
if (!xdp_active)
skb = bnxt_copy_skb(bnapi, data_ptr, len, dma_addr);
else
@ -4608,6 +4607,11 @@ void bnxt_set_tpa_flags(struct bnxt *bp)
bp->flags |= BNXT_FLAG_GRO;
}
static void bnxt_init_ring_params(struct bnxt *bp)
{
bp->rx_copybreak = BNXT_DEFAULT_RX_COPYBREAK;
}
/* bp->rx_ring_size, bp->tx_ring_size, dev->mtu, BNXT_FLAG_{G|L}RO flags must
* be set on entry.
*/
@ -4622,7 +4626,6 @@ void bnxt_set_ring_params(struct bnxt *bp)
rx_space = rx_size + ALIGN(max(NET_SKB_PAD, XDP_PACKET_HEADROOM), 8) +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
bp->rx_copy_thresh = BNXT_RX_COPY_THRESH;
ring_size = bp->rx_ring_size;
bp->rx_agg_ring_size = 0;
bp->rx_agg_nr_pages = 0;
@ -4667,7 +4670,9 @@ void bnxt_set_ring_params(struct bnxt *bp)
ALIGN(max(NET_SKB_PAD, XDP_PACKET_HEADROOM), 8) -
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
} else {
rx_size = SKB_DATA_ALIGN(BNXT_RX_COPY_THRESH + NET_IP_ALIGN);
rx_size = SKB_DATA_ALIGN(max(BNXT_DEFAULT_RX_COPYBREAK,
bp->rx_copybreak) +
NET_IP_ALIGN);
rx_space = rx_size + NET_SKB_PAD +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
}
@ -6573,16 +6578,14 @@ static int bnxt_hwrm_vnic_set_hds(struct bnxt *bp, struct bnxt_vnic_info *vnic)
req->flags = cpu_to_le32(VNIC_PLCMODES_CFG_REQ_FLAGS_JUMBO_PLACEMENT);
req->enables = cpu_to_le32(VNIC_PLCMODES_CFG_REQ_ENABLES_JUMBO_THRESH_VALID);
req->jumbo_thresh = cpu_to_le16(bp->rx_buf_use_size);
if (BNXT_RX_PAGE_MODE(bp)) {
req->jumbo_thresh = cpu_to_le16(bp->rx_buf_use_size);
} else {
if (!BNXT_RX_PAGE_MODE(bp) && (bp->flags & BNXT_FLAG_AGG_RINGS)) {
req->flags |= cpu_to_le32(VNIC_PLCMODES_CFG_REQ_FLAGS_HDS_IPV4 |
VNIC_PLCMODES_CFG_REQ_FLAGS_HDS_IPV6);
req->enables |=
cpu_to_le32(VNIC_PLCMODES_CFG_REQ_ENABLES_HDS_THRESHOLD_VALID);
req->jumbo_thresh = cpu_to_le16(bp->rx_copy_thresh);
req->hds_threshold = cpu_to_le16(bp->rx_copy_thresh);
req->hds_threshold = cpu_to_le16(bp->rx_copybreak);
}
req->vnic_id = cpu_to_le32(vnic->fw_vnic_id);
return hwrm_req_send(bp, req);
@ -16261,6 +16264,7 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
bnxt_init_l2_fltr_tbl(bp);
bnxt_set_rx_skb_mode(bp, false);
bnxt_set_tpa_flags(bp);
bnxt_init_ring_params(bp);
bnxt_set_ring_params(bp);
bnxt_rdma_aux_device_init(bp);
rc = bnxt_set_dflt_rings(bp, true);

5
drivers/net/ethernet/broadcom/bnxt/bnxt.h
View file

@ -34,6 +34,9 @@
#include <linux/firmware/broadcom/tee_bnxt_fw.h>
#endif
#define BNXT_DEFAULT_RX_COPYBREAK 256
#define BNXT_MAX_RX_COPYBREAK 1024
extern struct list_head bnxt_block_cb_list;
struct page_pool;
@ -2347,7 +2350,7 @@ struct bnxt {
enum dma_data_direction rx_dir;
u32 rx_ring_size;
u32 rx_agg_ring_size;
u32 rx_copy_thresh;
u32 rx_copybreak;
u32 rx_ring_mask;
u32 rx_agg_ring_mask;
int rx_nr_pages;

44
drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
View file

@ -4328,6 +4328,45 @@ static int bnxt_get_eee(struct net_device *dev, struct ethtool_keee *edata)
return 0;
}
static int bnxt_set_tunable(struct net_device *dev,
const struct ethtool_tunable *tuna,
const void *data)
{
struct bnxt *bp = netdev_priv(dev);
u32 rx_copybreak;
switch (tuna->id) {
case ETHTOOL_RX_COPYBREAK:
rx_copybreak = *(u32 *)data;
if (rx_copybreak > BNXT_MAX_RX_COPYBREAK)
return -ERANGE;
if (rx_copybreak != bp->rx_copybreak) {
if (netif_running(dev))
return -EBUSY;
bp->rx_copybreak = rx_copybreak;
}
return 0;
default:
return -EOPNOTSUPP;
}
}
static int bnxt_get_tunable(struct net_device *dev,
const struct ethtool_tunable *tuna, void *data)
{
struct bnxt *bp = netdev_priv(dev);
switch (tuna->id) {
case ETHTOOL_RX_COPYBREAK:
*(u32 *)data = bp->rx_copybreak;
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int bnxt_read_sfp_module_eeprom_info(struct bnxt *bp, u16 i2c_addr,
u16 page_number, u8 bank,
u16 start_addr, u16 data_length,
@ -4790,7 +4829,8 @@ static int bnxt_run_loopback(struct bnxt *bp)
cpr = &rxr->bnapi->cp_ring;
if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS)
cpr = rxr->rx_cpr;
pkt_size = min(bp->dev->mtu + ETH_HLEN, bp->rx_copy_thresh);
pkt_size = min(bp->dev->mtu + ETH_HLEN, max(BNXT_DEFAULT_RX_COPYBREAK,
bp->rx_copybreak));
skb = netdev_alloc_skb(bp->dev, pkt_size);
if (!skb)
return -ENOMEM;
@ -5372,6 +5412,8 @@ const struct ethtool_ops bnxt_ethtool_ops = {
.get_link_ext_stats = bnxt_get_link_ext_stats,
.get_eee = bnxt_get_eee,
.set_eee = bnxt_set_eee,
.get_tunable = bnxt_get_tunable,
.set_tunable = bnxt_set_tunable,
.get_module_info = bnxt_get_module_info,
.get_module_eeprom = bnxt_get_module_eeprom,
.get_module_eeprom_by_page = bnxt_get_module_eeprom_by_page,