myri10ge: remove hardcoded sram_size

Removes the use of a hardcoded sram_size, determine string_spec
location from the MCP header instead.

Signed-off-by: Brice Goglin <brice@myri.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index cd856d7ce9f128303ee4d53faf60484ce898c748..c724d96fd1e5cabbfa51620e8818363fa09cb963 100644 (file)
--- a/drivers/net/myri10ge/myri10ge.c
+++ b/drivers/net/myri10ge/myri10ge.c
@@ -3739,6 +3739,7 @@ static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
        int i;
        int status = -ENXIO;
        int dac_enabled;
+       unsigned hdr_offset, ss_offset;
 
        netdev = alloc_etherdev_mq(sizeof(*mgp), MYRI10GE_MAX_SLICES);
        if (netdev == NULL) {
@@ -3806,14 +3807,6 @@ static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
        if (mgp->mtrr >= 0)
                mgp->wc_enabled = 1;
 #endif
-       /* Hack.  need to get rid of these magic numbers */
-       mgp->sram_size =
-           2 * 1024 * 1024 - (2 * (48 * 1024) + (32 * 1024)) - 0x100;
-       if (mgp->sram_size > mgp->board_span) {
-               dev_err(&pdev->dev, "board span %ld bytes too small\n",
-                       mgp->board_span);
-               goto abort_with_mtrr;
-       }
        mgp->sram = ioremap_wc(mgp->iomem_base, mgp->board_span);
        if (mgp->sram == NULL) {
                dev_err(&pdev->dev, "ioremap failed for %ld bytes at 0x%lx\n",
@@ -3821,9 +3814,19 @@ static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
                status = -ENXIO;
                goto abort_with_mtrr;
        }
+       hdr_offset =
+           ntohl(__raw_readl(mgp->sram + MCP_HEADER_PTR_OFFSET)) & 0xffffc;
+       ss_offset = hdr_offset + offsetof(struct mcp_gen_header, string_specs);
+       mgp->sram_size = ntohl(__raw_readl(mgp->sram + ss_offset));
+       if (mgp->sram_size > mgp->board_span ||
+           mgp->sram_size <= MYRI10GE_FW_OFFSET) {
+               dev_err(&pdev->dev,
+                       "invalid sram_size %dB or board span %ldB\n",
+                       mgp->sram_size, mgp->board_span);
+               goto abort_with_ioremap;
+       }
        memcpy_fromio(mgp->eeprom_strings,
-                     mgp->sram + mgp->sram_size - MYRI10GE_EEPROM_STRINGS_SIZE,
-                     MYRI10GE_EEPROM_STRINGS_SIZE);
+                     mgp->sram + mgp->sram_size, MYRI10GE_EEPROM_STRINGS_SIZE);
        memset(mgp->eeprom_strings + MYRI10GE_EEPROM_STRINGS_SIZE - 2, 0, 2);
        status = myri10ge_read_mac_addr(mgp);
        if (status)