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octeontx2-pf: Change receive buffer size using ethtool

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ethtool rx-buf-len is for setting receive buffer size,
support setting it via ethtool -G parameter and getting
it via ethtool -g parameter.

Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Subbaraya Sundeep
2022-01-28 09:41:36 +05:30
committed by David S. Miller
parent 4f49974238
commit a989eb6668
5 changed files with 33 additions and 1 deletions
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19
drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
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@@ -371,6 +371,7 @@ static void otx2_get_ringparam(struct net_device *netdev,
ring->rx_pending = qs->rqe_cnt ? qs->rqe_cnt : Q_COUNT(Q_SIZE_256);
ring->tx_max_pending = Q_COUNT(Q_SIZE_MAX);
ring->tx_pending = qs->sqe_cnt ? qs->sqe_cnt : Q_COUNT(Q_SIZE_4K);
kernel_ring->rx_buf_len = pfvf->hw.rbuf_len;
}
static int otx2_set_ringparam(struct net_device *netdev,
@@ -379,6 +380,8 @@ static int otx2_set_ringparam(struct net_device *netdev,
struct netlink_ext_ack *extack)
{
struct otx2_nic *pfvf = netdev_priv(netdev);
u32 rx_buf_len = kernel_ring->rx_buf_len;
u32 old_rx_buf_len = pfvf->hw.rbuf_len;
bool if_up = netif_running(netdev);
struct otx2_qset *qs = &pfvf->qset;
u32 rx_count, tx_count;
@@ -386,6 +389,15 @@ static int otx2_set_ringparam(struct net_device *netdev,
if (ring->rx_mini_pending || ring->rx_jumbo_pending)
return -EINVAL;
/* Hardware supports max size of 32k for a receive buffer
* and 1536 is typical ethernet frame size.
*/
if (rx_buf_len && (rx_buf_len < 1536 || rx_buf_len > 32768)) {
netdev_err(netdev,
"Receive buffer range is 1536 - 32768");
return -EINVAL;
}
/* Permitted lengths are 16 64 256 1K 4K 16K 64K 256K 1M */
rx_count = ring->rx_pending;
/* On some silicon variants a skid or reserved CQEs are
@@ -403,7 +415,8 @@ static int otx2_set_ringparam(struct net_device *netdev,
Q_COUNT(Q_SIZE_4K), Q_COUNT(Q_SIZE_MAX));
tx_count = Q_COUNT(Q_SIZE(tx_count, 3));
if (tx_count == qs->sqe_cnt && rx_count == qs->rqe_cnt)
if (tx_count == qs->sqe_cnt && rx_count == qs->rqe_cnt &&
rx_buf_len == old_rx_buf_len)
return 0;
if (if_up)
@@ -413,6 +426,8 @@ static int otx2_set_ringparam(struct net_device *netdev,
qs->sqe_cnt = tx_count;
qs->rqe_cnt = rx_count;
pfvf->hw.rbuf_len = rx_buf_len;
if (if_up)
return netdev->netdev_ops->ndo_open(netdev);
@@ -1207,6 +1222,7 @@ end:
static const struct ethtool_ops otx2_ethtool_ops = {
.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
ETHTOOL_COALESCE_MAX_FRAMES,
.supported_ring_params = ETHTOOL_RING_USE_RX_BUF_LEN,
.get_link = otx2_get_link,
.get_drvinfo = otx2_get_drvinfo,
.get_strings = otx2_get_strings,
@@ -1326,6 +1342,7 @@ static int otx2vf_get_link_ksettings(struct net_device *netdev,
static const struct ethtool_ops otx2vf_ethtool_ops = {
.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
ETHTOOL_COALESCE_MAX_FRAMES,
.supported_ring_params = ETHTOOL_RING_USE_RX_BUF_LEN,
.get_link = otx2_get_link,
.get_drvinfo = otx2vf_get_drvinfo,
.get_strings = otx2vf_get_strings,