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Message-Id: <1485827375-20421-6-git-send-email-michael.chan@broadcom.com>
Date: Mon, 30 Jan 2017 20:49:30 -0500
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org
Subject: [PATCH net-next 05/10] 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@...adcom.com>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 68 ++++++++++++++---------
drivers/net/ethernet/broadcom/bnxt/bnxt.h | 2 +-
drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 39 +++----------
3 files changed, 52 insertions(+), 57 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 0f6ca67..cb30ba4 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -4204,7 +4204,7 @@ 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;
@@ -4997,19 +4997,12 @@ 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);
}
}
@@ -6571,6 +6564,37 @@ 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;
@@ -6733,6 +6757,7 @@ 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",
@@ -6746,19 +6771,10 @@ 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))
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 2202113..44dcc26 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1186,7 +1186,6 @@ 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);
@@ -1200,6 +1199,7 @@ int bnxt_hwrm_func_rgtr_async_events(struct bnxt *bp, unsigned long *bmap,
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);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 24818e1..6f2568d 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -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;
--
1.8.3.1
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