bge: Add busdma constraints for old chips

- Most pre BCM5755 controllers have a DMA bug when buffer address
  crosses a multiple of the 4GB boundary
- For BCM5714/BCM5715 controllers, limit the DMA address to be within
  40bit address space.

Obtained-from: FreeBSD 199670

diff --git a/sys/dev/netif/bge/if_bge.c b/sys/dev/netif/bge/if_bge.c
index d00310c..b54fe9b 100644 (file)
--- a/sys/dev/netif/bge/if_bge.c
+++ b/sys/dev/netif/bge/if_bge.c
@@ -1939,6 +1939,25 @@ bge_attach(device_t dev)
                      : ((sc->bge_flags & BGE_FLAG_PCIE) ?
                        "PCI-E" : "PCI"));
 
+       /*
+        * All controllers that are not 5755 or higher have 4GB
+        * boundary DMA bug.
+        * Whenever an address crosses a multiple of the 4GB boundary
+        * (including 4GB, 8Gb, 12Gb, etc.) and makes the transition
+        * from 0xX_FFFF_FFFF to 0x(X+1)_0000_0000 an internal DMA
+        * state machine will lockup and cause the device to hang.
+        */
+       if (BGE_IS_5755_PLUS(sc) == 0)
+               sc->bge_flags |= BGE_FLAG_BOUNDARY_4G;
+
+       /*
+        * The 40bit DMA bug applies to the 5714/5715 controllers and is
+        * not actually a MAC controller bug but an issue with the embedded
+        * PCIe to PCI-X bridge in the device. Use 40bit DMA workaround.
+        */
+       if (BGE_IS_5714_FAMILY(sc) && (sc->bge_flags & BGE_FLAG_PCIX))
+               sc->bge_flags |= BGE_FLAG_MAXADDR_40BIT;
+
        ifp = &sc->arpcom.ac_if;
        if_initname(ifp, device_get_name(dev), device_get_unit(dev));
 
@@ -3457,12 +3476,22 @@ bge_dma_alloc(struct bge_softc *sc)
 {
        struct ifnet *ifp = &sc->arpcom.ac_if;
        int i, error;
+       bus_addr_t lowaddr;
+       bus_size_t boundary;
+
+       boundary = 0;
+       if (sc->bge_flags & BGE_FLAG_BOUNDARY_4G)
+               boundary = BGE_DMA_BOUNDARY_4G;
+
+       lowaddr = BUS_SPACE_MAXADDR;
+       if (sc->bge_flags & BGE_FLAG_MAXADDR_40BIT)
+               lowaddr = BGE_DMA_MAXADDR_40BIT;
 
        /*
         * Allocate the parent bus DMA tag appropriate for PCI.
         */
-       error = bus_dma_tag_create(NULL, 1, 0,
-                                  BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR,
+       error = bus_dma_tag_create(NULL, 1, boundary,
+                                  lowaddr, BUS_SPACE_MAXADDR,
                                   NULL, NULL,
                                   BUS_SPACE_MAXSIZE_32BIT, 0,
                                   BUS_SPACE_MAXSIZE_32BIT,

diff --git a/sys/dev/netif/bge/if_bgereg.h b/sys/dev/netif/bge/if_bgereg.h
index 54f3b18..1dcb4f7 100644 (file)
--- a/sys/dev/netif/bge/if_bgereg.h
+++ b/sys/dev/netif/bge/if_bgereg.h
@@ -2342,6 +2342,14 @@ struct bge_jslot {
        SLIST_ENTRY(bge_jslot)  jslot_link;
 };
 
+#if (BUS_SPACE_MAXADDR != BUS_SPACE_MAXADDR_32BIT)
+#define        BGE_DMA_MAXADDR_40BIT   0xFFFFFFFFFF
+#define BGE_DMA_BOUNDARY_4G    0x100000000ULL
+#else
+#define        BGE_DMA_MAXADDR_40BIT   BUS_SPACE_MAXADDR
+#define BGE_DMA_BOUNDARY_4G    0
+#endif
+
 /*
  * Ring structures. Most of these reside in host memory and we tell
  * the NIC where they are via the ring control blocks. The exceptions
@@ -2455,6 +2463,8 @@ struct bge_softc {
 #define BGE_FLAG_5714_FAMILY   0x00004000
 #define BGE_FLAG_575X_PLUS     0x00008000
 #define BGE_FLAG_5755_PLUS     0x00010000
+#define BGE_FLAG_MAXADDR_40BIT 0x00020000
+#define BGE_FLAG_BOUNDARY_4G   0x00040000
 #define BGE_FLAG_RX_ALIGNBUG   0x00100000
 #define BGE_FLAG_NO_3LED       0x00200000
 #define BGE_FLAG_ADC_BUG       0x00400000