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bnxt_en: Centralize logic to reserve rings. 

Currently, bnxt_setup_tc() and bnxt_set_channels() have similar and
duplicated code to check and reserve rx and tx rings.  Add a new
function bnxt_reserve_rings() to centralize the logic.  This will
make it easier to add XDP_TX support which requires allocating a
new set of TX rings.

Also, the tx ring checking logic in bnxt_setup_msix() can be removed.
The rings have been reserved before hand.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2017-02-06 16:55:38 -05:00 committed by David S. Miller
parent 4e5dbbda4c
commit d1e7925e6d
3 changed files with 52 additions and 57 deletions
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68
drivers/net/ethernet/broadcom/bnxt/bnxt.c
View File

@ -4212,7 +4212,7 @@ int __bnxt_hwrm_get_tx_rings(struct bnxt *bp, u16 fid, int *tx_rings)
return rc;
}
int bnxt_hwrm_reserve_tx_rings(struct bnxt *bp, int *tx_rings)
static int bnxt_hwrm_reserve_tx_rings(struct bnxt *bp, int *tx_rings)
{
struct hwrm_func_cfg_input req = {0};
int rc;
@ -5005,19 +5005,12 @@ static void bnxt_setup_msix(struct bnxt *bp)
tcs = netdev_get_num_tc(dev);
if (tcs > 1) {
bp->tx_nr_rings_per_tc = bp->tx_nr_rings / tcs;
if (bp->tx_nr_rings_per_tc == 0) {
netdev_reset_tc(dev);
bp->tx_nr_rings_per_tc = bp->tx_nr_rings;
} else {
int i, off, count;
int i, off, count;
bp->tx_nr_rings = bp->tx_nr_rings_per_tc * tcs;
for (i = 0; i < tcs; i++) {
count = bp->tx_nr_rings_per_tc;
off = i * count;
netdev_set_tc_queue(dev, i, count, off);
}
for (i = 0; i < tcs; i++) {
count = bp->tx_nr_rings_per_tc;
off = i * count;
netdev_set_tc_queue(dev, i, count, off);
}
}
@ -6579,6 +6572,37 @@ static void bnxt_sp_task(struct work_struct *work)
clear_bit(BNXT_STATE_IN_SP_TASK, &bp->state);
}
/* Under rtnl_lock */
int bnxt_reserve_rings(struct bnxt *bp, int tx, int rx, int tcs)
{
int max_rx, max_tx, tx_sets = 1;
int tx_rings_needed;
bool sh = true;
int rc;
if (!(bp->flags & BNXT_FLAG_SHARED_RINGS))
sh = false;
if (tcs)
tx_sets = tcs;
rc = bnxt_get_max_rings(bp, &max_rx, &max_tx, sh);
if (rc)
return rc;
if (max_rx < rx)
return -ENOMEM;
tx_rings_needed = tx * tx_sets;
if (max_tx < tx_rings_needed)
return -ENOMEM;
if (bnxt_hwrm_reserve_tx_rings(bp, &tx_rings_needed) ||
tx_rings_needed < (tx * tx_sets))
return -ENOMEM;
return 0;
}
static int bnxt_init_board(struct pci_dev *pdev, struct net_device *dev)
{
int rc;
@ -6741,6 +6765,7 @@ int bnxt_setup_mq_tc(struct net_device *dev, u8 tc)
{
struct bnxt *bp = netdev_priv(dev);
bool sh = false;
int rc;
if (tc > bp->max_tc) {
netdev_err(dev, "too many traffic classes requested: %d Max supported is %d\n",
@ -6754,19 +6779,10 @@ int bnxt_setup_mq_tc(struct net_device *dev, u8 tc)
if (bp->flags & BNXT_FLAG_SHARED_RINGS)
sh = true;
if (tc) {
int max_rx_rings, max_tx_rings, req_tx_rings, rsv_tx_rings, rc;
req_tx_rings = bp->tx_nr_rings_per_tc * tc;
rc = bnxt_get_max_rings(bp, &max_rx_rings, &max_tx_rings, sh);
if (rc || req_tx_rings > max_tx_rings)
return -ENOMEM;
rsv_tx_rings = req_tx_rings;
if (bnxt_hwrm_reserve_tx_rings(bp, &rsv_tx_rings) ||
rsv_tx_rings < req_tx_rings)
return -ENOMEM;
}
rc = bnxt_reserve_rings(bp, bp->tx_nr_rings_per_tc,
bp->rx_nr_rings, tc);
if (rc)
return rc;
/* Needs to close the device and do hw resource re-allocations */
if (netif_running(bp->dev))

2
drivers/net/ethernet/broadcom/bnxt/bnxt.h
View File

@ -1188,7 +1188,6 @@ int bnxt_hwrm_func_rgtr_async_events(struct bnxt *bp, unsigned long *bmap,
int bmap_size);
int bnxt_hwrm_vnic_cfg(struct bnxt *bp, u16 vnic_id);
int __bnxt_hwrm_get_tx_rings(struct bnxt *bp, u16 fid, int *tx_rings);
int bnxt_hwrm_reserve_tx_rings(struct bnxt *bp, int *tx_rings);
int bnxt_hwrm_set_coal(struct bnxt *);
unsigned int bnxt_get_max_func_stat_ctxs(struct bnxt *bp);
void bnxt_set_max_func_stat_ctxs(struct bnxt *bp, unsigned int max);
@ -1202,6 +1201,7 @@ int bnxt_hwrm_set_link_setting(struct bnxt *, bool, bool);
int bnxt_hwrm_fw_set_time(struct bnxt *);
int bnxt_open_nic(struct bnxt *, bool, bool);
int bnxt_close_nic(struct bnxt *, bool, bool);
int bnxt_reserve_rings(struct bnxt *bp, int tx, int rx, int tcs);
int bnxt_setup_mq_tc(struct net_device *dev, u8 tc);
int bnxt_get_max_rings(struct bnxt *, int *, int *, bool);
void bnxt_restore_pf_fw_resources(struct bnxt *bp);

39
drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
View File

@ -387,10 +387,9 @@ static int bnxt_set_channels(struct net_device *dev,
struct ethtool_channels *channel)
{
struct bnxt *bp = netdev_priv(dev);
int max_rx_rings, max_tx_rings, tcs;
int req_tx_rings, rsv_tx_rings;
u32 rc = 0;
int req_tx_rings, req_rx_rings, tcs;
bool sh = false;
int rc = 0;
if (channel->other_count)
return -EINVAL;
@ -410,32 +409,14 @@ static int bnxt_set_channels(struct net_device *dev,
if (channel->combined_count)
sh = true;
bnxt_get_max_rings(bp, &max_rx_rings, &max_tx_rings, sh);
tcs = netdev_get_num_tc(dev);
if (tcs > 1)
max_tx_rings /= tcs;
if (sh &&
channel->combined_count > max_t(int, max_rx_rings, max_tx_rings))
return -ENOMEM;
if (!sh && (channel->rx_count > max_rx_rings ||
channel->tx_count > max_tx_rings))
return -ENOMEM;
req_tx_rings = sh ? channel->combined_count : channel->tx_count;
req_tx_rings = min_t(int, req_tx_rings, max_tx_rings);
if (tcs > 1)
req_tx_rings *= tcs;
rsv_tx_rings = req_tx_rings;
if (bnxt_hwrm_reserve_tx_rings(bp, &rsv_tx_rings))
return -ENOMEM;
if (rsv_tx_rings < req_tx_rings) {
netdev_warn(dev, "Unable to allocate the requested tx rings\n");
return -ENOMEM;
req_rx_rings = sh ? channel->combined_count : channel->rx_count;
rc = bnxt_reserve_rings(bp, req_tx_rings, req_rx_rings, tcs);
if (rc) {
netdev_warn(dev, "Unable to allocate the requested rings\n");
return rc;
}
if (netif_running(dev)) {
@ -454,10 +435,8 @@ static int bnxt_set_channels(struct net_device *dev,
if (sh) {
bp->flags |= BNXT_FLAG_SHARED_RINGS;
bp->rx_nr_rings = min_t(int, channel->combined_count,
max_rx_rings);
bp->tx_nr_rings_per_tc = min_t(int, channel->combined_count,
max_tx_rings);
bp->rx_nr_rings = channel->combined_count;
bp->tx_nr_rings_per_tc = channel->combined_count;
} else {
bp->flags &= ~BNXT_FLAG_SHARED_RINGS;
bp->rx_nr_rings = channel->rx_count;