bnxt_en: Reduce memory usage when running in kdump kernel.

Skip RDMA context memory allocations, reduce to 1 ring, and disable
TPA when running in the kdump kernel.  Without this patch, the driver
fails to initialize with memory allocation errors when running in a
typical kdump kernel.

Fixes: cf6daed098d1 ("bnxt_en: Increase context memory allocations on 57500 chips for RDMA.")
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.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index cfcc33c..79812da 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -6379,7 +6379,7 @@ static int bnxt_alloc_ctx_mem(struct bnxt *bp)
        if (!ctx || (ctx->flags & BNXT_CTX_FLAG_INITED))
                return 0;
 
-       if (bp->flags & BNXT_FLAG_ROCE_CAP) {
+       if ((bp->flags & BNXT_FLAG_ROCE_CAP) && !is_kdump_kernel()) {
                pg_lvl = 2;
                extra_qps = 65536;
                extra_srqs = 8192;
@@ -10437,7 +10437,7 @@ static int bnxt_set_dflt_rings(struct bnxt *bp, bool sh)
 
        if (sh)
                bp->flags |= BNXT_FLAG_SHARED_RINGS;
-       dflt_rings = netif_get_num_default_rss_queues();
+       dflt_rings = is_kdump_kernel() ? 1 : netif_get_num_default_rss_queues();
        /* Reduce default rings on multi-port cards so that total default
         * rings do not exceed CPU count.
         */

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index acc73f3..be438d8 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -20,6 +20,7 @@
 
 #include <linux/interrupt.h>
 #include <linux/rhashtable.h>
+#include <linux/crash_dump.h>
 #include <net/devlink.h>
 #include <net/dst_metadata.h>
 #include <net/xdp.h>
@@ -1369,7 +1370,8 @@ struct bnxt {
 #define BNXT_CHIP_TYPE_NITRO_A0(bp) ((bp)->flags & BNXT_FLAG_CHIP_NITRO_A0)
 #define BNXT_RX_PAGE_MODE(bp)  ((bp)->flags & BNXT_FLAG_RX_PAGE_MODE)
 #define BNXT_SUPPORTS_TPA(bp)  (!BNXT_CHIP_TYPE_NITRO_A0(bp) &&        \
-                                !(bp->flags & BNXT_FLAG_CHIP_P5))
+                                !(bp->flags & BNXT_FLAG_CHIP_P5) &&    \
+                                !is_kdump_kernel())
 
 /* Chip class phase 5 */
 #define BNXT_CHIP_P5(bp)                       \