cxgb4: avoid collecting SGE_QBASE regs during traffic

Accessing SGE_QBASE_MAP[0-3] and SGE_QBASE_INDEX registers can lead
to SGE missing doorbells under heavy traffic. So, only collect them
when adapter is idle. Also update the regdump range to skip collecting
these registers.

Fixes: 80a95a80d358 ("cxgb4: collect SGE PF/VF queue map")
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
index 6c85a10..23a2ebd 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
@@ -1794,11 +1794,25 @@ int cudbg_collect_sge_indirect(struct cudbg_init *pdbg_init,
        struct cudbg_buffer temp_buff = { 0 };
        struct sge_qbase_reg_field *sge_qbase;
        struct ireg_buf *ch_sge_dbg;
+       u8 padap_running = 0;
        int i, rc;
+       u32 size;
 
-       rc = cudbg_get_buff(pdbg_init, dbg_buff,
-                           sizeof(*ch_sge_dbg) * 2 + sizeof(*sge_qbase),
-                           &temp_buff);
+       /* Accessing SGE_QBASE_MAP[0-3] and SGE_QBASE_INDEX regs can
+        * lead to SGE missing doorbells under heavy traffic. So, only
+        * collect them when adapter is idle.
+        */
+       for_each_port(padap, i) {
+               padap_running = netif_running(padap->port[i]);
+               if (padap_running)
+                       break;
+       }
+
+       size = sizeof(*ch_sge_dbg) * 2;
+       if (!padap_running)
+               size += sizeof(*sge_qbase);
+
+       rc = cudbg_get_buff(pdbg_init, dbg_buff, size, &temp_buff);
        if (rc)
                return rc;
 
@@ -1820,7 +1834,8 @@ int cudbg_collect_sge_indirect(struct cudbg_init *pdbg_init,
                ch_sge_dbg++;
        }
 
-       if (CHELSIO_CHIP_VERSION(padap->params.chip) > CHELSIO_T5) {
+       if (CHELSIO_CHIP_VERSION(padap->params.chip) > CHELSIO_T5 &&
+           !padap_running) {
                sge_qbase = (struct sge_qbase_reg_field *)ch_sge_dbg;
                /* 1 addr reg SGE_QBASE_INDEX and 4 data reg
                 * SGE_QBASE_MAP[0-3]

diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
index 98829e4..80882cf 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
@@ -2090,7 +2090,8 @@ void t4_get_regs(struct adapter *adap, void *buf, size_t buf_size)
                0x1190, 0x1194,
                0x11a0, 0x11a4,
                0x11b0, 0x11b4,
-               0x11fc, 0x1274,
+               0x11fc, 0x123c,
+               0x1254, 0x1274,
                0x1280, 0x133c,
                0x1800, 0x18fc,
                0x3000, 0x302c,