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Diffstat (limited to 'drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c')
-rw-r--r--drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c35
1 files changed, 30 insertions, 5 deletions
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c
index a1d0446..348ed02 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c
@@ -39,14 +39,39 @@ static inline long bnx2x_hilo(u32 *hiref)
#endif
}
-static u16 bnx2x_get_port_stats_dma_len(struct bnx2x *bp)
+static inline u16 bnx2x_get_port_stats_dma_len(struct bnx2x *bp)
{
- u16 res = sizeof(struct host_port_stats) >> 2;
+ u16 res = 0;
- /* if PFC stats are not supported by the MFW, don't DMA them */
- if (!(bp->flags & BC_SUPPORTS_PFC_STATS))
- res -= (sizeof(u32)*4) >> 2;
+ /* 'newest' convention - shmem2 cotains the size of the port stats */
+ if (SHMEM2_HAS(bp, sizeof_port_stats)) {
+ u32 size = SHMEM2_RD(bp, sizeof_port_stats);
+ if (size)
+ res = size;
+ /* prevent newer BC from causing buffer overflow */
+ if (res > sizeof(struct host_port_stats))
+ res = sizeof(struct host_port_stats);
+ }
+
+ /* Older convention - all BCs support the port stats' fields up until
+ * the 'not_used' field
+ */
+ if (!res) {
+ res = offsetof(struct host_port_stats, not_used) + 4;
+
+ /* if PFC stats are supported by the MFW, DMA them as well */
+ if (bp->flags & BC_SUPPORTS_PFC_STATS) {
+ res += offsetof(struct host_port_stats,
+ pfc_frames_rx_lo) -
+ offsetof(struct host_port_stats,
+ pfc_frames_tx_hi) + 4 ;
+ }
+ }
+
+ res >>= 2;
+
+ WARN_ON(res > 2 * DMAE_LEN32_RD_MAX);
return res;
}
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