bnxt_en: Fix VF resource checking.

In bnxt_sriov_enable(), we calculate to see if we have enough hardware
resources to enable the requested number of VFs.  The logic to check
for minimum completion rings and statistics contexts is missing.  Add
the required checks so that VF configuration won't fail.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
index d37925a8a65b6d79d96063d0eabcac9bae8dadd9..5ee18660bc33a2572320ac3210029e883841b044 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
@@ -502,6 +502,7 @@ static int bnxt_sriov_enable(struct bnxt *bp, int *num_vfs)
        int rc = 0, vfs_supported;
        int min_rx_rings, min_tx_rings, min_rss_ctxs;
        int tx_ok = 0, rx_ok = 0, rss_ok = 0;
+       int avail_cp, avail_stat;
 
        /* Check if we can enable requested num of vf's. At a mininum
         * we require 1 RX 1 TX rings for each VF. In this minimum conf
@@ -509,6 +510,10 @@ static int bnxt_sriov_enable(struct bnxt *bp, int *num_vfs)
         */
        vfs_supported = *num_vfs;
 
+       avail_cp = bp->pf.max_cp_rings - bp->cp_nr_rings;
+       avail_stat = bp->pf.max_stat_ctxs - bp->num_stat_ctxs;
+       avail_cp = min_t(int, avail_cp, avail_stat);
+
        while (vfs_supported) {
                min_rx_rings = vfs_supported;
                min_tx_rings = vfs_supported;
@@ -523,10 +528,12 @@ static int bnxt_sriov_enable(struct bnxt *bp, int *num_vfs)
                            min_rx_rings)
                                rx_ok = 1;
                }
-               if (bp->pf.max_vnics - bp->nr_vnics < min_rx_rings)
+               if (bp->pf.max_vnics - bp->nr_vnics < min_rx_rings ||
+                   avail_cp < min_rx_rings)
                        rx_ok = 0;
 
-               if (bp->pf.max_tx_rings - bp->tx_nr_rings >= min_tx_rings)
+               if (bp->pf.max_tx_rings - bp->tx_nr_rings >= min_tx_rings &&
+                   avail_cp >= min_tx_rings)
                        tx_ok = 1;
 
                if (bp->pf.max_rsscos_ctxs - bp->rsscos_nr_ctxs >= min_rss_ctxs)