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Message-ID: <20241105094855.GE595392@gmail.com>
Date: Tue, 5 Nov 2024 09:48:55 +0000
From: Martin Habets <habetsm.xilinx@...il.com>
To: Rosen Penev <rosenp@...il.com>
Cc: netdev@...r.kernel.org, Edward Cree <ecree.xilinx@...il.com>,
Andrew Lunn <andrew+netdev@...n.ch>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>,
"open list:SFC NETWORK DRIVER" <linux-net-drivers@....com>,
open list <linux-kernel@...r.kernel.org>,
"open list:XDP (eXpress Data Path):Keyword:(?:b|_)xdp(?:b|_)" <bpf@...r.kernel.org>
Subject: Re: [PATCH net-next] net: sfc: use ethtool string helpers
On Mon, Nov 04, 2024 at 12:27:05PM -0800, Rosen Penev wrote:
>
> The latter is the preferred way to copy ethtool strings.
>
> Avoids manually incrementing the pointer. Cleans up the code quite well.
>
> Signed-off-by: Rosen Penev <rosenp@...il.com>
> ---
> drivers/net/ethernet/sfc/ethtool_common.c | 34 +++++++------------
> drivers/net/ethernet/sfc/falcon/ethtool.c | 24 +++++--------
> drivers/net/ethernet/sfc/falcon/nic.c | 7 ++--
> drivers/net/ethernet/sfc/nic.c | 7 ++--
> .../net/ethernet/sfc/siena/ethtool_common.c | 34 +++++++------------
> drivers/net/ethernet/sfc/siena/nic.c | 7 ++--
> 6 files changed, 40 insertions(+), 73 deletions(-)
>
> diff --git a/drivers/net/ethernet/sfc/ethtool_common.c b/drivers/net/ethernet/sfc/ethtool_common.c
> index ae32e08540fa..d46972f45ec1 100644
> --- a/drivers/net/ethernet/sfc/ethtool_common.c
> +++ b/drivers/net/ethernet/sfc/ethtool_common.c
> @@ -403,24 +403,19 @@ static size_t efx_describe_per_queue_stats(struct efx_nic *efx, u8 *strings)
> efx_for_each_channel(channel, efx) {
> if (efx_channel_has_tx_queues(channel)) {
> n_stats++;
> - if (strings != NULL) {
> - snprintf(strings, ETH_GSTRING_LEN,
> - "tx-%u.tx_packets",
> - channel->tx_queue[0].queue /
> - EFX_MAX_TXQ_PER_CHANNEL);
> -
> - strings += ETH_GSTRING_LEN;
> - }
> + if (strings)
> + ethtool_sprintf(
> + &strings, "tx-%u.tx_packets",
This still fits after the opening parentheses above within 80 characters.
I would prefer that style.
Martin
> + channel->tx_queue[0].queue /
> + EFX_MAX_TXQ_PER_CHANNEL);
> }
> }
> efx_for_each_channel(channel, efx) {
> if (efx_channel_has_rx_queue(channel)) {
> n_stats++;
> - if (strings != NULL) {
> - snprintf(strings, ETH_GSTRING_LEN,
> - "rx-%d.rx_packets", channel->channel);
> - strings += ETH_GSTRING_LEN;
> - }
> + if (strings)
> + ethtool_sprintf(&strings, "rx-%d.rx_packets",
> + channel->channel);
> }
> }
> if (efx->xdp_tx_queue_count && efx->xdp_tx_queues) {
> @@ -428,11 +423,10 @@ static size_t efx_describe_per_queue_stats(struct efx_nic *efx, u8 *strings)
>
> for (xdp = 0; xdp < efx->xdp_tx_queue_count; xdp++) {
> n_stats++;
> - if (strings) {
> - snprintf(strings, ETH_GSTRING_LEN,
> - "tx-xdp-cpu-%hu.tx_packets", xdp);
> - strings += ETH_GSTRING_LEN;
> - }
> + if (strings)
> + ethtool_sprintf(&strings,
> + "tx-xdp-cpu-%hu.tx_packets",
> + xdp);
> }
> }
>
> @@ -467,9 +461,7 @@ void efx_ethtool_get_strings(struct net_device *net_dev,
> strings += (efx->type->describe_stats(efx, strings) *
> ETH_GSTRING_LEN);
> for (i = 0; i < EFX_ETHTOOL_SW_STAT_COUNT; i++)
> - strscpy(strings + i * ETH_GSTRING_LEN,
> - efx_sw_stat_desc[i].name, ETH_GSTRING_LEN);
> - strings += EFX_ETHTOOL_SW_STAT_COUNT * ETH_GSTRING_LEN;
> + ethtool_puts(&strings, efx_sw_stat_desc[i].name);
> strings += (efx_describe_per_queue_stats(efx, strings) *
> ETH_GSTRING_LEN);
> efx_ptp_describe_stats(efx, strings);
> diff --git a/drivers/net/ethernet/sfc/falcon/ethtool.c b/drivers/net/ethernet/sfc/falcon/ethtool.c
> index f4db683b80f7..41bd63d0c40c 100644
> --- a/drivers/net/ethernet/sfc/falcon/ethtool.c
> +++ b/drivers/net/ethernet/sfc/falcon/ethtool.c
> @@ -361,24 +361,18 @@ static size_t ef4_describe_per_queue_stats(struct ef4_nic *efx, u8 *strings)
> ef4_for_each_channel(channel, efx) {
> if (ef4_channel_has_tx_queues(channel)) {
> n_stats++;
> - if (strings != NULL) {
> - snprintf(strings, ETH_GSTRING_LEN,
> - "tx-%u.tx_packets",
> - channel->tx_queue[0].queue /
> - EF4_TXQ_TYPES);
> -
> - strings += ETH_GSTRING_LEN;
> - }
> + if (strings)
> + ethtool_sprintf(&strings, "tx-%u.tx_packets",
> + channel->tx_queue[0].queue /
> + EF4_TXQ_TYPES);
> }
> }
> ef4_for_each_channel(channel, efx) {
> if (ef4_channel_has_rx_queue(channel)) {
> n_stats++;
> - if (strings != NULL) {
> - snprintf(strings, ETH_GSTRING_LEN,
> - "rx-%d.rx_packets", channel->channel);
> - strings += ETH_GSTRING_LEN;
> - }
> + if (strings)
> + ethtool_sprintf(&strings, "rx-%d.rx_packets",
> + channel->channel);
> }
> }
> return n_stats;
> @@ -412,9 +406,7 @@ static void ef4_ethtool_get_strings(struct net_device *net_dev,
> strings += (efx->type->describe_stats(efx, strings) *
> ETH_GSTRING_LEN);
> for (i = 0; i < EF4_ETHTOOL_SW_STAT_COUNT; i++)
> - strscpy(strings + i * ETH_GSTRING_LEN,
> - ef4_sw_stat_desc[i].name, ETH_GSTRING_LEN);
> - strings += EF4_ETHTOOL_SW_STAT_COUNT * ETH_GSTRING_LEN;
> + ethtool_puts(&strings, ef4_sw_stat_desc[i].name);
> strings += (ef4_describe_per_queue_stats(efx, strings) *
> ETH_GSTRING_LEN);
> break;
> diff --git a/drivers/net/ethernet/sfc/falcon/nic.c b/drivers/net/ethernet/sfc/falcon/nic.c
> index 78c851b5a56f..a7f0caa8710f 100644
> --- a/drivers/net/ethernet/sfc/falcon/nic.c
> +++ b/drivers/net/ethernet/sfc/falcon/nic.c
> @@ -451,11 +451,8 @@ size_t ef4_nic_describe_stats(const struct ef4_hw_stat_desc *desc, size_t count,
>
> for_each_set_bit(index, mask, count) {
> if (desc[index].name) {
> - if (names) {
> - strscpy(names, desc[index].name,
> - ETH_GSTRING_LEN);
> - names += ETH_GSTRING_LEN;
> - }
> + if (names)
> + ethtool_puts(&names, desc[index].name);
> ++visible;
> }
> }
> diff --git a/drivers/net/ethernet/sfc/nic.c b/drivers/net/ethernet/sfc/nic.c
> index a33ed473cc8a..51c975cff4fe 100644
> --- a/drivers/net/ethernet/sfc/nic.c
> +++ b/drivers/net/ethernet/sfc/nic.c
> @@ -306,11 +306,8 @@ size_t efx_nic_describe_stats(const struct efx_hw_stat_desc *desc, size_t count,
>
> for_each_set_bit(index, mask, count) {
> if (desc[index].name) {
> - if (names) {
> - strscpy(names, desc[index].name,
> - ETH_GSTRING_LEN);
> - names += ETH_GSTRING_LEN;
> - }
> + if (names)
> + ethtool_puts(&names, desc[index].name);
> ++visible;
> }
> }
> diff --git a/drivers/net/ethernet/sfc/siena/ethtool_common.c b/drivers/net/ethernet/sfc/siena/ethtool_common.c
> index 075fef64de68..53b1cdf872d8 100644
> --- a/drivers/net/ethernet/sfc/siena/ethtool_common.c
> +++ b/drivers/net/ethernet/sfc/siena/ethtool_common.c
> @@ -403,24 +403,19 @@ static size_t efx_describe_per_queue_stats(struct efx_nic *efx, u8 *strings)
> efx_for_each_channel(channel, efx) {
> if (efx_channel_has_tx_queues(channel)) {
> n_stats++;
> - if (strings != NULL) {
> - snprintf(strings, ETH_GSTRING_LEN,
> - "tx-%u.tx_packets",
> - channel->tx_queue[0].queue /
> - EFX_MAX_TXQ_PER_CHANNEL);
> -
> - strings += ETH_GSTRING_LEN;
> - }
> + if (strings)
> + ethtool_sprintf(
> + &strings, "tx-%u.tx_packets",
> + channel->tx_queue[0].queue /
> + EFX_MAX_TXQ_PER_CHANNEL);
> }
> }
> efx_for_each_channel(channel, efx) {
> if (efx_channel_has_rx_queue(channel)) {
> n_stats++;
> - if (strings != NULL) {
> - snprintf(strings, ETH_GSTRING_LEN,
> - "rx-%d.rx_packets", channel->channel);
> - strings += ETH_GSTRING_LEN;
> - }
> + if (strings)
> + ethtool_sprintf(&strings, "rx-%d.rx_packets",
> + channel->channel);
> }
> }
> if (efx->xdp_tx_queue_count && efx->xdp_tx_queues) {
> @@ -428,11 +423,10 @@ static size_t efx_describe_per_queue_stats(struct efx_nic *efx, u8 *strings)
>
> for (xdp = 0; xdp < efx->xdp_tx_queue_count; xdp++) {
> n_stats++;
> - if (strings) {
> - snprintf(strings, ETH_GSTRING_LEN,
> - "tx-xdp-cpu-%hu.tx_packets", xdp);
> - strings += ETH_GSTRING_LEN;
> - }
> + if (strings)
> + ethtool_sprintf(&strings,
> + "tx-xdp-cpu-%hu.tx_packets",
> + xdp);
> }
> }
>
> @@ -467,9 +461,7 @@ void efx_siena_ethtool_get_strings(struct net_device *net_dev,
> strings += (efx->type->describe_stats(efx, strings) *
> ETH_GSTRING_LEN);
> for (i = 0; i < EFX_ETHTOOL_SW_STAT_COUNT; i++)
> - strscpy(strings + i * ETH_GSTRING_LEN,
> - efx_sw_stat_desc[i].name, ETH_GSTRING_LEN);
> - strings += EFX_ETHTOOL_SW_STAT_COUNT * ETH_GSTRING_LEN;
> + ethtool_puts(&strings, efx_sw_stat_desc[i].name);
> strings += (efx_describe_per_queue_stats(efx, strings) *
> ETH_GSTRING_LEN);
> efx_siena_ptp_describe_stats(efx, strings);
> diff --git a/drivers/net/ethernet/sfc/siena/nic.c b/drivers/net/ethernet/sfc/siena/nic.c
> index 0ea0433a6230..06b97218b490 100644
> --- a/drivers/net/ethernet/sfc/siena/nic.c
> +++ b/drivers/net/ethernet/sfc/siena/nic.c
> @@ -457,11 +457,8 @@ size_t efx_siena_describe_stats(const struct efx_hw_stat_desc *desc, size_t coun
>
> for_each_set_bit(index, mask, count) {
> if (desc[index].name) {
> - if (names) {
> - strscpy(names, desc[index].name,
> - ETH_GSTRING_LEN);
> - names += ETH_GSTRING_LEN;
> - }
> + if (names)
> + ethtool_puts(&names, desc[index].name);
> ++visible;
> }
> }
> --
> 2.47.0
>
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